This page has only limited features, please log in for full access.

Prof. Sabu Thomas
Vice - Chancellor, Mahathma Gandhi University, Kottayam, Kerala, India

Basic Info

Basic Info is private.

Research Keywords & Expertise

0 Chemistry
0 Polymers
0 Tissue Engineering
0 nano technology
0 fibres

Fingerprints

Polymers
fibres
Tissue Engineering
Chemistry

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

Prof. Sabu Thomas is one of India’s most renowned scientists known for his contributions in polymer science and nanotechnology. He has received several national and international awards for best researcher. He has authored more than 1200 research publications and 140 books. He has an h-index of 108 and has accumulated over 56724 citations. He has been ranked 114th in the list of the world’s best scientists that has been compiled by Stanford University in the US. He figures in the list as the second-best scientist in India in the field of polymer science.

Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 30 July 2021 in Atmospheric Environment
Reads 0
Downloads 0

Unique airborne observations of aerosol size spectral and chemical characteristics over the peninsular Indian region are illustrated in this case study. Multimodal lognormal distributions were required to fit the observed in situ aerosol size distribution. The aerosol composition and mixing state was deduced from the single-particle analyses of aerosols using the transmission electron microscope and soot photometer coupled with satellite retrieved aerosol classification, and back trajectory analyses. Organic carbon was the most prominent aerosol type found at all altitudes. Refractory black carbon aerosols which constituted about 10 - 12% of the aerosols in the boundary layer were primarily internally mixed with both inorganic and organic coating. Other major aerosol types were dust and sea salt, with the latter primarily found below 2 km. Further, the cloud forming ability of in-situ aerosols is tested through a cloud condensation nuclei closure analysis. The effective hygroscopicity decreased above cloud base due to the absence of sea salt aerosols. The change in large-scale winds with altitude affected the aerosol composition and hygroscopicity. The multimodal aerosol size distribution and hygroscopicity parameter (κ = 0.18) obtained for the cloud base aerosols over the rain shadow region are useful for studying aerosol-cloud interactions using regional cloud-resolving models.

ACS Style

Mercy Varghese; Jerry Jose; A.S. Anu; Mahen Konwar; P. Murugavel; Nandakumar Kalarikkal; Medha Deshpande; Thara V. Prabha. Vertical profile of aerosol characteristics including activation over a rain shadow region in India. Atmospheric Environment 2021, 262, 118653 .

AMA Style

Mercy Varghese, Jerry Jose, A.S. Anu, Mahen Konwar, P. Murugavel, Nandakumar Kalarikkal, Medha Deshpande, Thara V. Prabha. Vertical profile of aerosol characteristics including activation over a rain shadow region in India. Atmospheric Environment. 2021; 262 ():118653.

Chicago/Turabian Style

Mercy Varghese; Jerry Jose; A.S. Anu; Mahen Konwar; P. Murugavel; Nandakumar Kalarikkal; Medha Deshpande; Thara V. Prabha. 2021. "Vertical profile of aerosol characteristics including activation over a rain shadow region in India." Atmospheric Environment 262, no. : 118653.

Journal article
Published: 24 July 2021 in Colloids and Surfaces A: Physicochemical and Engineering Aspects
Reads 0
Downloads 0

Nanostructured self-assembled and high-performance epoxy/epoxidized poly(styrene-block-butadiene-block-styrene) block copolymer blends with 55 mol% epoxidation degree [eSBS55]- 0,5,10 and 20 phr- 4, 4′diaminodiphenyl methane (DDM) material were successfully synthesized by using solvent casting method. The role of the highest epoxidized SBS (eSBS55) as a modifier and its concentration on the effect of nanostructured morphology, viscoelastic properties, reaction induced phase separation and thermal degradation kinetics of epoxy/eSBS55system were investigated in detail. Various theoretical models such as Coats-Redfern method, Broido method and Horowitz- Metzger method were applied for the first time on epoxy/eSBS systems to calculate the thermodynamic parameters and correlate experimental results. These highly enhanced viscoelastic & thermal properties and nanoscale morphology of as synthesized novel epoxy/eSBS55 material have proved that ‘eSBS55’is an outstanding modifier to epoxy resin for creating superior high-performance properties required for various coating and structural applications such as in aircrafts, floorings, automobiles and constructions.

ACS Style

V.R. Remya; C.V. Pious; Olufemi O. Adeyemi; Sundararajan Parani; El HadjiMamour Sakho; Jose V. Rajendran; Rodney Maluleke; Nandakumar Kalarikkal; Sabu Thomas; Oluwatobi S. Oluwafemi. Self-assembled nanostructured viscoelastic and thermally stable high performance epoxy based nanomaterial for aircraft and automobile applications: An experimental and theoretical modeling approach. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2021, 627, 127236 .

AMA Style

V.R. Remya, C.V. Pious, Olufemi O. Adeyemi, Sundararajan Parani, El HadjiMamour Sakho, Jose V. Rajendran, Rodney Maluleke, Nandakumar Kalarikkal, Sabu Thomas, Oluwatobi S. Oluwafemi. Self-assembled nanostructured viscoelastic and thermally stable high performance epoxy based nanomaterial for aircraft and automobile applications: An experimental and theoretical modeling approach. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2021; 627 ():127236.

Chicago/Turabian Style

V.R. Remya; C.V. Pious; Olufemi O. Adeyemi; Sundararajan Parani; El HadjiMamour Sakho; Jose V. Rajendran; Rodney Maluleke; Nandakumar Kalarikkal; Sabu Thomas; Oluwatobi S. Oluwafemi. 2021. "Self-assembled nanostructured viscoelastic and thermally stable high performance epoxy based nanomaterial for aircraft and automobile applications: An experimental and theoretical modeling approach." Colloids and Surfaces A: Physicochemical and Engineering Aspects 627, no. : 127236.

Research article
Published: 11 July 2021 in Advanced Theory and Simulations
Reads 0
Downloads 0

Nonfullerene acceptors (NFAs) are a new focus in organic photovoltaics (OPVs), and continue to progress upon the drawbacks of many fullerene-based electron acceptors. The aim of this work is to identify some important parameters that influence the efficiency of NF-acceptors in OPVs. These results provide an enhanced understanding of the effect of the NFAs core structure (electron rich/poor group) on the photophysical and optoelectronic properties. In addition, the effect of the small ΔLUMO value (the subtle difference in energy between LUMO+1 and LUMO orbitals of NFAs; LUMO=lowest unoccupied molecular orbitals) on ultrafast charge transfer and charge separation processes in OPVs, recently identified as a key factor for all top rated high performing NFAs, is studied. So far, ΔLUMO-based theoretical studies are limited to individual NFAs; here, for the first time, the authors have extended to the respective donor/acceptor complexes as well. Finally, based on the first-principles density functional theory calculations with the seven reported NFAs, PC 61 BM , P3HT, and the seven newly modeled donor–acceptor complexes, this study sheds light on important factors that will provide trends and guidelines for further rational design of more efficient NF-acceptors for OPVs.

ACS Style

Saju Joseph; Mahesh Kumar Ravva; Binny A Davis; Sabu Thomas; Nandakumar Kalarikkal. Theoretical Study on Understanding the Effects of Core Structure and Energy Level Tuning on Efficiency of Nonfullerene Acceptors in Organic Solar Cells. Advanced Theory and Simulations 2021, 2100019 .

AMA Style

Saju Joseph, Mahesh Kumar Ravva, Binny A Davis, Sabu Thomas, Nandakumar Kalarikkal. Theoretical Study on Understanding the Effects of Core Structure and Energy Level Tuning on Efficiency of Nonfullerene Acceptors in Organic Solar Cells. Advanced Theory and Simulations. 2021; ():2100019.

Chicago/Turabian Style

Saju Joseph; Mahesh Kumar Ravva; Binny A Davis; Sabu Thomas; Nandakumar Kalarikkal. 2021. "Theoretical Study on Understanding the Effects of Core Structure and Energy Level Tuning on Efficiency of Nonfullerene Acceptors in Organic Solar Cells." Advanced Theory and Simulations , no. : 2100019.

Review article
Published: 29 June 2021 in Advanced Industrial and Engineering Polymer Research
Reads 0
Downloads 0

A large amount of non-infected plastic wastes are being generated at the healthcare facilities all over the world. However, only a small fraction is recycled. Conventionally, the used plastics are either disposed in landfills or inadequately incinerated. These practices impart an adverse effect on our environment. Plastics are indispensable part of the medical sector owing to their high versatility. The outbreak of Covid-19 clearly showed the growing demand for single use plastics. Hence, completely avoiding plastics can be challenging at this point of time. Recycling of plastics is undoubtedly a solution to solve the crisis of plastic pollution. Medical plastic recycling is limited mainly due to difficulties involved in sorting or cleaning. Recycling medical plastic wastes is possible only through proper coordination between healthcare sector and recycling industries. New recycling technologies are to be adopted in a sustainable manner. Moreover, the plastics used in medical applications should be designed such that recycling is possible. This review highlights the downside of medical wastes and discusses the recycling potential of commonly used medical plastics.

ACS Style

Blessy Joseph; Jemy James; Nandakumar Kalarikkal; Sabu Thomas. Recycling of medical plastics. Advanced Industrial and Engineering Polymer Research 2021, 4, 199 -208.

AMA Style

Blessy Joseph, Jemy James, Nandakumar Kalarikkal, Sabu Thomas. Recycling of medical plastics. Advanced Industrial and Engineering Polymer Research. 2021; 4 (3):199-208.

Chicago/Turabian Style

Blessy Joseph; Jemy James; Nandakumar Kalarikkal; Sabu Thomas. 2021. "Recycling of medical plastics." Advanced Industrial and Engineering Polymer Research 4, no. 3: 199-208.

Article
Published: 24 June 2021 in Journal of Polymer Science
Reads 0
Downloads 0

Microporous polypropylene (PP) nanocomposite membranes are in great demand in various fields such as energy harvesting, water purification, and other industrial applications. Thin films of PP/natural rubber (NR) blend nanocomposite have been prepared by melt mixing and the membranes are made porous by extracting the NR phase from the blend. The present study gives a better insight into the nanoparticle shape and localization-tailored porous morphology of PP membrane. Thermodynamic prediction of nanofiller localization and its impact on morphology were studied. 2D clay platelets in PP matrix tune the morphology of the porous membrane into lamellar, whereas spherical nanofillers give elongated spherical pores. The localization of nanoparticles was observed using transmission electron microscope, which is also confirmed from theoretical prediction of localization of nanofillers with the help of interfacial energy and surface tension. Thermal studies reveal that nanofillers enhance the thermal stability of polymers. Mechanical studies reveal that nanoparticles improve the mechanical properties of the system. 2D platelet shaped-nanofillers enhance the mechanical strength of the polymer up to 39%, which is higher than that obtained for 3D spherical nanofillers. Nanofiller shape and localization have a great influence in deciding the properties and porosity of the membrane.

ACS Style

Kottathodi Bicy; Didier Rouxel; Marc Poncot; Isabelle Royaud; Patrice Bourson; David Chapron; Nandakumar Kalarikkal; Sabu Thomas. Interfacial tuning and designer morphologies of microporous membranes based on polypropylene/natural rubber nanocomposites. Journal of Polymer Science 2021, 51208 .

AMA Style

Kottathodi Bicy, Didier Rouxel, Marc Poncot, Isabelle Royaud, Patrice Bourson, David Chapron, Nandakumar Kalarikkal, Sabu Thomas. Interfacial tuning and designer morphologies of microporous membranes based on polypropylene/natural rubber nanocomposites. Journal of Polymer Science. 2021; ():51208.

Chicago/Turabian Style

Kottathodi Bicy; Didier Rouxel; Marc Poncot; Isabelle Royaud; Patrice Bourson; David Chapron; Nandakumar Kalarikkal; Sabu Thomas. 2021. "Interfacial tuning and designer morphologies of microporous membranes based on polypropylene/natural rubber nanocomposites." Journal of Polymer Science , no. : 51208.

Chapter
Published: 22 June 2021 in Gels Horizons: From Science to Smart Materials
Reads 0
Downloads 0

Cancer is a fatal disease which occurs due to abnormal and uncontrolled growth of cells in the form of tumor. To meet the societal requirements of a proper diagnosis of cancer and effective cancer treatment, researchers put their continuous efforts using cutting-edge technology to develop novel cancer theragnostics. Nanotechnology has revolutionized the field of medicine through point-of-care cancer diagnosis and site-specific drug delivery for treating cancer. The use of nanoparticles as drug carriers might improve the therapeutic efficacy by means of targeted drug delivery. This chapter presents an overview of recent developments in nanoparticles-based cancer therapeutics. Various multifunctional nanoparticles that are developed for effective cancer therapy are illustrated with suitable examples. Moreover, the FDA- or EMA-approved nanomedicines and other approval awaiting (under clinical trials) nanomedicines for cancer therapy are elaborated.

ACS Style

Saravanan Krishnan; Blessy Joseph; Jemy James; Sabu Thomas. Nanomaterials for Cancer Therapeutics. Gels Horizons: From Science to Smart Materials 2021, 1 -20.

AMA Style

Saravanan Krishnan, Blessy Joseph, Jemy James, Sabu Thomas. Nanomaterials for Cancer Therapeutics. Gels Horizons: From Science to Smart Materials. 2021; ():1-20.

Chicago/Turabian Style

Saravanan Krishnan; Blessy Joseph; Jemy James; Sabu Thomas. 2021. "Nanomaterials for Cancer Therapeutics." Gels Horizons: From Science to Smart Materials , no. : 1-20.

Chapter
Published: 22 June 2021 in Gels Horizons: From Science to Smart Materials
Reads 0
Downloads 0

Most of the anticancer drugs affect both the cancerous cells and the normal cells. The most common treatment chemotherapy is always associated with the poor selection of the targeted cancer cells and also the drug resistance. Therefore, to enhance the therapeutic efficacy of anticancer drugs, nano-drug delivery systems have been designed and implemented. To limit the challenges associated with the conventional chemotherapy, there are strategies to combat it. The strategies are functionalising the material, functionalisation with multiple targets, in vivo imaging and dual/multiple drug delivery system. This chapter provides insights about the wide range of polymers which helps to engineer the anticancer molecules. It also emphasises the different mechanisms for releasing the anticancer drugs in an effective manner. The recent advances about the materials used for cancer therapy and commercially available products are also discussed. The effect of engineered biomaterials for treating the cancer patients is mostly expected to increase in the future.

ACS Style

R. Rajakumari; Sabu Thomas; Nandakumar Kalarikkal. Biomaterials and Its Advances for Delivering Anticancer Drugs. Gels Horizons: From Science to Smart Materials 2021, 21 -56.

AMA Style

R. Rajakumari, Sabu Thomas, Nandakumar Kalarikkal. Biomaterials and Its Advances for Delivering Anticancer Drugs. Gels Horizons: From Science to Smart Materials. 2021; ():21-56.

Chicago/Turabian Style

R. Rajakumari; Sabu Thomas; Nandakumar Kalarikkal. 2021. "Biomaterials and Its Advances for Delivering Anticancer Drugs." Gels Horizons: From Science to Smart Materials , no. : 21-56.

Chapter
Published: 22 June 2021 in Gels Horizons: From Science to Smart Materials
Reads 0
Downloads 0

Biomaterials for anticancer drug are an important and essential topic in twenty-first-century medicine, because this type of new materials overcomes the drawbacks of current chemotherapy technique and greatly improve the quality of life of the patients. The major issue that has faced in the past and current scenario is the less or non-bioavailability and biodegradability of drug delivery even though they have high therapeutic efficacy. To address this problem, recently most of the researchers were focused to develop nanotechnology to solve the problems in drug delivery. This may provide a better solution and thus changes the way we make drug and the way we take drug. Therefore, in this chapter, we have discussed cancer, oral chemotherapy and different biomaterials for anticancer drug and their advantage over conventional anticancer drugs. This chapter will be a remarkable one for understanding the usage of different type of biomaterials for the enhancement of bioavailability of anticancer drug delivery system.

ACS Style

V. R. Remya; Jesiya Susan George; V. Prejitha; K. P. Jibin; Sabu Thomas. Biomaterials for Anticancer Drugs. Gels Horizons: From Science to Smart Materials 2021, 133 -148.

AMA Style

V. R. Remya, Jesiya Susan George, V. Prejitha, K. P. Jibin, Sabu Thomas. Biomaterials for Anticancer Drugs. Gels Horizons: From Science to Smart Materials. 2021; ():133-148.

Chicago/Turabian Style

V. R. Remya; Jesiya Susan George; V. Prejitha; K. P. Jibin; Sabu Thomas. 2021. "Biomaterials for Anticancer Drugs." Gels Horizons: From Science to Smart Materials , no. : 133-148.

Original paper
Published: 19 June 2021 in Theoretical and Applied Climatology
Reads 0
Downloads 0

In situ measurements of aerosol particle chemistry and cloud microphysics made during the Cloud–Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) in 2015 over the Western Ghats and its rain shadow region are presented in this study. The high ratio of cloud condensation nuclei (CCN) to large sized aerosol (above 0.1 µm) concentrations indicates Aitken mode aerosols as the major contributor towards the observed CCN. Morphology and chemical composition of airborne aerosol samples collected from different altitudes and the warm cloud layers indicated distinct particle chemistry on the dry and wet days. The majority of the particles sampled were heterogeneous and internally mixed with two or more aerosol species indicating multiple sources and atmospheric aging, even during the wet days. Si-rich particles (up to 73%) were the dominant species in samples collected during dry days when the shallow clouds with narrow drop size distribution were observed. A higher concentration of Na-rich particles (up to 50%) was observed on wet days when the clouds were majorly multiple layers of stratus, which had broader cloud droplet spectra. Internally mixed carbonaceous and iron/cobalt-rich aerosols from local pollution sources were found on both wet and dry days suggesting boundary layer venting of aerosols. Large droplets were observed near the cloud base over the Western Ghats compared to those formed over the rain shadow region.

ACS Style

Mercy Varghese; Jerry Jose; A. S. Anu; P. Murugavel; E. A. Resmi; Sudarsan Bera; Sabu Thomas; Mahen Konwar; Nandakumar Kalarikkal; Thara V. Prabha. Cloud and aerosol characteristics during dry and wet days of southwest monsoon over the rain shadow region of Western Ghats, India. Theoretical and Applied Climatology 2021, 133, 1299 -1316.

AMA Style

Mercy Varghese, Jerry Jose, A. S. Anu, P. Murugavel, E. A. Resmi, Sudarsan Bera, Sabu Thomas, Mahen Konwar, Nandakumar Kalarikkal, Thara V. Prabha. Cloud and aerosol characteristics during dry and wet days of southwest monsoon over the rain shadow region of Western Ghats, India. Theoretical and Applied Climatology. 2021; 133 (4):1299-1316.

Chicago/Turabian Style

Mercy Varghese; Jerry Jose; A. S. Anu; P. Murugavel; E. A. Resmi; Sudarsan Bera; Sabu Thomas; Mahen Konwar; Nandakumar Kalarikkal; Thara V. Prabha. 2021. "Cloud and aerosol characteristics during dry and wet days of southwest monsoon over the rain shadow region of Western Ghats, India." Theoretical and Applied Climatology 133, no. 4: 1299-1316.

Review
Published: 14 June 2021 in Critical Reviews in Solid State and Materials Sciences
Reads 0
Downloads 0

Smart electronic materials ‘nanographene’ stated, its significant authentication has undergone massive improvements and has emerged as a ‘material of the century’ in materialize fields of ‘Chemical Biology’ and ‘Materials Chemistry’. ‘Graphene’ as a wonder material has been proposed to possess a high surface area (∼2600 m2 g−1), high portability of charge carriers and excellent mechanical qualities. Moreover, the long-extend π-conjugation of graphene is an essential photocatalytic property enabling wide ranging biosensor activities. Herein, critical review article reflects well known yet a brand-new novel material ‘nanographene’ and its versatile integrations, utilized for substantial enrichment of desired properties. Target cost-effectiveness, plasticity, and environment-friendliness of melt mixing/compounding fabrication strategy employed to utilize in-vivo, in-vitro, and in- situ, pharmaceutical, nano-imaging protocols. Owing to nanographene’s wide range expansion, summarized latest breakthroughs in Materials Science as well as Biomedical utilizations including cancer nanotechnology, drug delivery, tissue manufacturing, scaffold, photo-thermal therapy, antimicrobial activities, made up of exploring the significant opportunities and key challenges in this novel emerging field.

ACS Style

Kaushik Pal; Nidhi Asthana; Alaa A Aljabali; Sheetal K. Bhardwaj; Samo Kralj; Anastasia Penkova; Sabu Thomas; Tean Zaheer; Fernando Gomes de Souza. A critical review on multifunctional smart materials ‘nanographene’ emerging avenue: nano-imaging and biosensor applications. Critical Reviews in Solid State and Materials Sciences 2021, 1 -17.

AMA Style

Kaushik Pal, Nidhi Asthana, Alaa A Aljabali, Sheetal K. Bhardwaj, Samo Kralj, Anastasia Penkova, Sabu Thomas, Tean Zaheer, Fernando Gomes de Souza. A critical review on multifunctional smart materials ‘nanographene’ emerging avenue: nano-imaging and biosensor applications. Critical Reviews in Solid State and Materials Sciences. 2021; ():1-17.

Chicago/Turabian Style

Kaushik Pal; Nidhi Asthana; Alaa A Aljabali; Sheetal K. Bhardwaj; Samo Kralj; Anastasia Penkova; Sabu Thomas; Tean Zaheer; Fernando Gomes de Souza. 2021. "A critical review on multifunctional smart materials ‘nanographene’ emerging avenue: nano-imaging and biosensor applications." Critical Reviews in Solid State and Materials Sciences , no. : 1-17.

Research article
Published: 14 June 2021 in International Journal of Polymer Science
Reads 0
Downloads 0

Vitrimeric materials have emerged as fascinating and sustainable materials owing to their malleability, reprocessability, and recyclability. Sustainable vitrimeric materials can be prepared by reinforcing polymeric matrix with bioderived fillers. In the current work, a sustainable vitrimer is prepared by incorporating biomass-derived activated carbon (AC) filler into the epoxy matrix to achieve enhanced thermal and mechanical properties. Thus, prepared biocomposite vitrimers demonstrate a lower-temperature self-healing (70°C for 5 min) via disulfide exchanges, compared to the pristine epoxy vitrimers (80°C for 5 min). Significantly, the self-healing performances have been studied extensively with the flexural studies; and changes in material healing efficiency have been demonstrated based on the observed changes in modulus.

ACS Style

Balaji Krishnakumar; Debajyoti Bose; Manjeet Singh; R. V. Siva Prasanna Sanka; Velidi V. S. S. Gurunadh; Shailey Singhal; Vijay Parthasarthy; Liberata Guadagno; Poornima Vijayan P; Sabu Thomas; Sravendra Rana. Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance. International Journal of Polymer Science 2021, 2021, 1 -7.

AMA Style

Balaji Krishnakumar, Debajyoti Bose, Manjeet Singh, R. V. Siva Prasanna Sanka, Velidi V. S. S. Gurunadh, Shailey Singhal, Vijay Parthasarthy, Liberata Guadagno, Poornima Vijayan P, Sabu Thomas, Sravendra Rana. Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance. International Journal of Polymer Science. 2021; 2021 ():1-7.

Chicago/Turabian Style

Balaji Krishnakumar; Debajyoti Bose; Manjeet Singh; R. V. Siva Prasanna Sanka; Velidi V. S. S. Gurunadh; Shailey Singhal; Vijay Parthasarthy; Liberata Guadagno; Poornima Vijayan P; Sabu Thomas; Sravendra Rana. 2021. "Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance." International Journal of Polymer Science 2021, no. : 1-7.

Journal article
Published: 07 May 2021 in Nanomaterials
Reads 0
Downloads 0

The superior mechanical properties of multi-walled carbon nanotubes (MWCNTs) play a significant role in the improvement of the mechanical and thermal stability of an epoxy matrix. However, the agglomeration of carbon nanotubes (CNTs) in the epoxy is a common challenge and should be resolved to achieve the desired enhancement effect. The present paper investigated the thermal, mechanical, and water uptake properties of epoxy nanocomposites with surfactant-modified MWCNTs. The nanocomposites were prepared through the incorporation of different weight concentrations of MWCNTs into the epoxy matrix. Comparative analysis of neat epoxy and epoxy/CNT nanocomposites were conducted through thermal, mechanical, microscopic, and water uptake tests to reveal the improvement mechanism. The homogenous distribution of the CNTs in the epoxy was achieved by wrapping the surfactant onto the CNTs. The addition of surfactant-modified CNTs into the epoxy caused an obvious increase in the mechanical and thermal properties. This improvement mechanism could be attributed to the uniform dispersion of the CNTs in the epoxy matrix reducing the free volume between the polymer chains and restricting the chain segmental mobility, leading to strong interfacial bonding and an efficient load transfer capability between the CNTs and the epoxy matrix. However, the mechanical and thermal properties of the epoxy/CNT nanocomposite decreased owing to the agglomeration effect when the concentration of the CNTs exceeded the optimal percentage of 1.5%. Additionally, the CNTs could impart a reduction in the wettability of the surface of the epoxy/CNT nanocomposite, leading to the increase in the contact angle and a reduction in the water uptake, which was significant to improve the durability of the epoxy. Moreover, the higher weight concentration (2%) of the CNTs showed a greater water uptake owing to agglomeration, which may cause the formation of plenty of microcracks and microvoids in the nanocomposite.

ACS Style

Arya Uthaman; Hiran Lal; Chenggao Li; Guijun Xian; Sabu Thomas. Mechanical and Water Uptake Properties of Epoxy Nanocomposites with Surfactant-Modified Functionalized Multiwalled Carbon Nanotubes. Nanomaterials 2021, 11, 1234 .

AMA Style

Arya Uthaman, Hiran Lal, Chenggao Li, Guijun Xian, Sabu Thomas. Mechanical and Water Uptake Properties of Epoxy Nanocomposites with Surfactant-Modified Functionalized Multiwalled Carbon Nanotubes. Nanomaterials. 2021; 11 (5):1234.

Chicago/Turabian Style

Arya Uthaman; Hiran Lal; Chenggao Li; Guijun Xian; Sabu Thomas. 2021. "Mechanical and Water Uptake Properties of Epoxy Nanocomposites with Surfactant-Modified Functionalized Multiwalled Carbon Nanotubes." Nanomaterials 11, no. 5: 1234.

Research article
Published: 30 April 2021 in Polymers for Advanced Technologies
Reads 0
Downloads 0

The current report addresses the rheological and viscoelastic properties of poly (trimethylene terephthalate)/polyethylene blend system containing multiwall carbon nanotubes (MWCNTs). The alliance of MWCNT into the blend system raises both the modulus and the dynamic viscosity. The thermophysical properties of blend nanocomposites exhibit a lower threshold percolation particularly in comparison to nanocomposites PTT/MWCNT. The dynamic mechanical properties of nanocomposites were also enhanced by adding MWCNT and the higher storage modulus value of nanocomposites explains their reasonable load—bearing capacity by inserting MWCNT. Reinforcing efficiency factor, degree of entanglement density, coefficient of effectiveness, and volume of the constrained region of blend nanocomposites are studied and 90PTT/10PE/3CNT has shown maximum entanglement density value and reinforcement efficiency factor. Different theoretical models were used to predict the storage modulus of blend nanocomposites and among them, the Takayanagi model established fine concurrence with the experimental results.

ACS Style

Aswathi Madathinal Kunjappan; Arunima Reghunadhan; Ajitha A. Ramachandran; Lovely Mathew; Moothetty Padmanabhan; David Laroze; Sabu Thomas. Discussion on degree of entanglement, chain confinement, and reinforcement efficiency factor of PTT / PE blend nanocomposite embedded with MWCNTs. Polymers for Advanced Technologies 2021, 1 .

AMA Style

Aswathi Madathinal Kunjappan, Arunima Reghunadhan, Ajitha A. Ramachandran, Lovely Mathew, Moothetty Padmanabhan, David Laroze, Sabu Thomas. Discussion on degree of entanglement, chain confinement, and reinforcement efficiency factor of PTT / PE blend nanocomposite embedded with MWCNTs. Polymers for Advanced Technologies. 2021; ():1.

Chicago/Turabian Style

Aswathi Madathinal Kunjappan; Arunima Reghunadhan; Ajitha A. Ramachandran; Lovely Mathew; Moothetty Padmanabhan; David Laroze; Sabu Thomas. 2021. "Discussion on degree of entanglement, chain confinement, and reinforcement efficiency factor of PTT / PE blend nanocomposite embedded with MWCNTs." Polymers for Advanced Technologies , no. : 1.

Journal article
Published: 23 April 2021 in Nanomaterials
Reads 0
Downloads 0

Nanomaterials have engaged response from the scientific world in recent decades due to their exceptional physical and chemical properties counter to their bulk. They have been widely used in a polymer matrix to improve mechanical, thermal, barrier, electronic and chemical properties. In rubber nanocomposites, nanofillers dispersion and the interfacial adhesion between polymer and fillers influences the composites factual properties. In the present work, a comparison of the hybrid effects of carbon black with two different nanofillers (graphene oxide and nanoclay) was studied. The 70/30 composition of chlorobutyl rubber/natural rubber elastomer blend was taken as per the blend composition optimized from our previous studies. The hybrid effects of graphene oxide and nanoclay in dispersing the nanofillers were studied mainly by analyzing nanocomposite barrier properties. The results confirm that the combined effect of carbon black with graphene oxide and nanoclay could create hybrid effects in decreasing the gas permeability. The prepared nanocomposites which partially replace the expensive chlorobutyl rubber can be used for tyre inner liner application. Additionally, the reduction in the amount of carbon black in the nanocomposite can be an added advantage of considering the environmental and economic factors.

ACS Style

Jibin Keloth Paduvilan; Prajitha Velayudhan; Ashin Amanulla; Hanna Joseph Maria; Allisson Saiter-Fourcin; Sabu Thomas. Assessment of Graphene Oxide and Nanoclay Based Hybrid Filler in Chlorobutyl-Natural Rubber Blend for Advanced Gas Barrier Applications. Nanomaterials 2021, 11, 1098 .

AMA Style

Jibin Keloth Paduvilan, Prajitha Velayudhan, Ashin Amanulla, Hanna Joseph Maria, Allisson Saiter-Fourcin, Sabu Thomas. Assessment of Graphene Oxide and Nanoclay Based Hybrid Filler in Chlorobutyl-Natural Rubber Blend for Advanced Gas Barrier Applications. Nanomaterials. 2021; 11 (5):1098.

Chicago/Turabian Style

Jibin Keloth Paduvilan; Prajitha Velayudhan; Ashin Amanulla; Hanna Joseph Maria; Allisson Saiter-Fourcin; Sabu Thomas. 2021. "Assessment of Graphene Oxide and Nanoclay Based Hybrid Filler in Chlorobutyl-Natural Rubber Blend for Advanced Gas Barrier Applications." Nanomaterials 11, no. 5: 1098.

Review
Published: 09 April 2021 in Sustainable Chemistry
Reads 0
Downloads 0

Solvents are an inevitable part of industries. They are widely used in manufacturing and processing industries. Despite the numerous controlling measures taken, solvents contaminate our environment to a vast extent. Green and sustainable solvents have been a matter of growing interest within the research community over the past few years due to the increasing environmental concerns. Solvents are categorized as “green” based on their nonvolatility, nonflammability, availability, biodegradability and so on. The use of ionic liquids, super critical carbon dioxide and aqueous solvents for the fabrication of polymer composites is discussed in this review. The progress of utilizing solvent-free approaches for polymer composite preparation and efforts to produce new biobased solvents are also summarized.

ACS Style

Blessy Joseph; Saravanan Krishnan; Sagarika Kavil; Avinash Pai; Jemy James; Nandakumar Kalarikkal; Sabu Thomas. Green Chemistry Approach for Fabrication of Polymer Composites. Sustainable Chemistry 2021, 2, 254 -270.

AMA Style

Blessy Joseph, Saravanan Krishnan, Sagarika Kavil, Avinash Pai, Jemy James, Nandakumar Kalarikkal, Sabu Thomas. Green Chemistry Approach for Fabrication of Polymer Composites. Sustainable Chemistry. 2021; 2 (2):254-270.

Chicago/Turabian Style

Blessy Joseph; Saravanan Krishnan; Sagarika Kavil; Avinash Pai; Jemy James; Nandakumar Kalarikkal; Sabu Thomas. 2021. "Green Chemistry Approach for Fabrication of Polymer Composites." Sustainable Chemistry 2, no. 2: 254-270.

Original articles
Published: 06 April 2021 in Journal of Adhesion Science and Technology
Reads 0
Downloads 0

Solvent-based polychloroprene (CR) adhesive was formulated using four different types of tackifiers. Wood rosin (WD), coumarone-indene resin (CI), terpene-phenolic resin (TP) and para-tert-butyl phenol-formaldehyde (TBPF) resin were incorporated with CR at various amounts say 20–50 phr (parts per hundred rubber). The effect of nature and amount of resins on adhesion strength was measured on both leather to leather and rubber to rubber joints. Results indicated that the nature of resins greatly influenced the performance of the CR adhesive. The peel strength of CR/TBPF adhesive was higher than that of CR/TP, CR/CI and CR/WD adhesives. It was found that incorporation of TBPF resin also improved the thermal ageing resistance of the bonded joints. The properties of CR/resin adhesive were studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The interaction between the resin and CR was studied using FTIR spectroscopy. All the four tackifiers used were compatible with CR as confirmed by the DSC analysis.

ACS Style

Shybi A. A; Siby Varghese; Neethu Varghese; Sabu Thomas. Solvent-based polychloroprene contact adhesives: effect of tackifier. Journal of Adhesion Science and Technology 2021, 1 -14.

AMA Style

Shybi A. A, Siby Varghese, Neethu Varghese, Sabu Thomas. Solvent-based polychloroprene contact adhesives: effect of tackifier. Journal of Adhesion Science and Technology. 2021; ():1-14.

Chicago/Turabian Style

Shybi A. A; Siby Varghese; Neethu Varghese; Sabu Thomas. 2021. "Solvent-based polychloroprene contact adhesives: effect of tackifier." Journal of Adhesion Science and Technology , no. : 1-14.

Journal article
Published: 30 March 2021 in Nanomaterials
Reads 0
Downloads 0

The demand for metallic nanoparticle ornamented nanohybrid materials of graphene oxide (GO) finds copious recognition by virtue of its advanced high-tech applications. Far apart from the long-established synthesis protocols, a novel laser-induced generation of silver nanoparticles (Ag NPs) that are anchored onto the GO layers by a single-step green method named pulsed laser ablation has been exemplified in this work. The second and third harmonic wavelengths (532 nm and 355 nm) of an Nd:YAG pulsed laser is used for the production of Ag NPs from a bulk solid silver target ablated in an aqueous solution of GO to fabricate colloidal Ag-GO nanohybrid materials. UV-Vis absorption spectroscopy, Raman spectroscopy, and TEM validate the optical, structural, and morphological features of the hybrid nanomaterials. The results revealed that the laser-assisted in-situ deposition of Ag NPs on the few-layered GO surface improved its antibacterial properties, in which the hybrid nanostructure synthesized at a longer wavelength exhibited higher antibacterial action resistance to Escherichia coli (E. coli) than Staphylococcus aureus (S. aureus) bacteria. Moreover, nonlinear optical absorption (NLA) of Ag-GO nanohybrid was measured using the open aperture Z-scan technique. The Z-scan results signify the NLA properties of the Ag-GO hybrid material and have a large decline in transmittance of more than 60%, which can be employed as a promising optical limiting (OL) material.

ACS Style

Parvathy Nancy; Jiya Jose; Nithin Joy; Sivakumaran Valluvadasan; Reji Philip; Rodolphe Antoine; Sabu Thomas; Nandakumar Kalarikkal. Fabrication of Silver-Decorated Graphene Oxide Nanohybrids via Pulsed Laser Ablation with Excellent Antimicrobial and Optical Limiting Performance. Nanomaterials 2021, 11, 880 .

AMA Style

Parvathy Nancy, Jiya Jose, Nithin Joy, Sivakumaran Valluvadasan, Reji Philip, Rodolphe Antoine, Sabu Thomas, Nandakumar Kalarikkal. Fabrication of Silver-Decorated Graphene Oxide Nanohybrids via Pulsed Laser Ablation with Excellent Antimicrobial and Optical Limiting Performance. Nanomaterials. 2021; 11 (4):880.

Chicago/Turabian Style

Parvathy Nancy; Jiya Jose; Nithin Joy; Sivakumaran Valluvadasan; Reji Philip; Rodolphe Antoine; Sabu Thomas; Nandakumar Kalarikkal. 2021. "Fabrication of Silver-Decorated Graphene Oxide Nanohybrids via Pulsed Laser Ablation with Excellent Antimicrobial and Optical Limiting Performance." Nanomaterials 11, no. 4: 880.

Journal article
Published: 18 March 2021 in Polymers
Reads 0
Downloads 0

In this study, we report the isolation of cellulose nanocrystals (CNCs) from Isora plant fibers by sulfuric acid hydrolysis and their assembly on hydrophilic cellulose and silicon-di-oxide (SiO2) surfaces via a layer-by-layer (LBL) deposition method. The isolated CNCs were monodispersed and exhibited a length of 200–300 nm and a diameter of 10–20 nm, a negative zetapotential (−34–39 mV) over a wide pH range, and high stability in water at various concentrations. The multi-layered structure, adsorbed mass, conformational changes, and anticoagulant activity of sequentially deposited anionic (sulfated) CNCs and cationic polyethyleneimine (PEI) on the surfaces of cellulose and SiO2 by LBL deposition were investigated using a quartz crystal microbalance technique. The organization and surface features (i.e., morphology, thickness, wettability) of CNCs adsorbed on the surfaces of PEI deposited at different ionic strengths (50–300 mM) of sodium chloride were analysed in detail by profilometry layer-thickness, atomic force microscopy and contact angle measurements. Compared to cellulose (control sample), the total coagulation time and plasma deposition were increased and decreased, respectively, for multilayers of PEI/CNCs. This study should provide new possibilities to fabricate and tailor the physicochemical properties of multilayer films from polysaccharide-based nanocrystals for various biomedical applications.

ACS Style

Tamilselvan Mohan; Cintil Chirayil; Chandran Nagaraj; Matej Bračič; Tobias Steindorfer; Igor Krupa; Mariam Maadeed; Rupert Kargl; Sabu Thomas; Karin Stana Kleinschek. Anticoagulant Activity of Cellulose Nanocrystals from Isora Plant Fibers Assembled on Cellulose and SiO2 Substrates via a Layer-by-Layer Approach. Polymers 2021, 13, 939 .

AMA Style

Tamilselvan Mohan, Cintil Chirayil, Chandran Nagaraj, Matej Bračič, Tobias Steindorfer, Igor Krupa, Mariam Maadeed, Rupert Kargl, Sabu Thomas, Karin Stana Kleinschek. Anticoagulant Activity of Cellulose Nanocrystals from Isora Plant Fibers Assembled on Cellulose and SiO2 Substrates via a Layer-by-Layer Approach. Polymers. 2021; 13 (6):939.

Chicago/Turabian Style

Tamilselvan Mohan; Cintil Chirayil; Chandran Nagaraj; Matej Bračič; Tobias Steindorfer; Igor Krupa; Mariam Maadeed; Rupert Kargl; Sabu Thomas; Karin Stana Kleinschek. 2021. "Anticoagulant Activity of Cellulose Nanocrystals from Isora Plant Fibers Assembled on Cellulose and SiO2 Substrates via a Layer-by-Layer Approach." Polymers 13, no. 6: 939.

Journal article
Published: 09 March 2021 in Chemical Physics Letters
Reads 0
Downloads 0

In the present study, BaTiO3/g-C3N4 heterostructures with various g-C3N4 contents have been synthesized by a simple method. Formation of g-C3N4 and BaTiO3/g-C3N4 heterostructures were confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and Transmission electron microscopy (TEM) analysis. The photocatalytic activity of BaTiO3/g-C3N4 heterostructures was evaluated by the degradation of methylene blue (MB) dye. The as-prepared BaTiO3/g-C3N4 heterostructured photocatalysts exhibit enhanced photocatalytic activity for the degradation of MB dye under sunlight irradiation. This can be attributed to the matchable band structures, resulting in the efficient separation and transfer of photogenerated charge carriers.

ACS Style

Shabina Kappadan; Sabu Thomas; Nandakumar Kalarikkal. Enhanced photocatalytic performance of BaTiO3/g-C3N4 heterojunction for the degradation of organic pollutants. Chemical Physics Letters 2021, 771, 138513 .

AMA Style

Shabina Kappadan, Sabu Thomas, Nandakumar Kalarikkal. Enhanced photocatalytic performance of BaTiO3/g-C3N4 heterojunction for the degradation of organic pollutants. Chemical Physics Letters. 2021; 771 ():138513.

Chicago/Turabian Style

Shabina Kappadan; Sabu Thomas; Nandakumar Kalarikkal. 2021. "Enhanced photocatalytic performance of BaTiO3/g-C3N4 heterojunction for the degradation of organic pollutants." Chemical Physics Letters 771, no. : 138513.

Research article
Published: 05 March 2021 in ACS Omega
Reads 0
Downloads 0

Nano-heterostructures have attracted immense attention recently due to their remarkable interfacial properties determined by the heterointerface of different nanostructures. Here, using first-principles density functional theory (DFT) calculations, we examine what range the variable electronic properties such as the electronic band gap can be tuned by combining two dissimilar nanostructures consisting of atomically thin nanostructured MoS2 clusters with small silver and gold nanoparticles (Ag/Au NPs). Most interestingly, our calculations show that the electronic band gap of the nanostructured MoS2 cluster can be tuned from 2.48 to 1.58 and 1.61 eV, by the formation of heterostructures with silver and gold metal nanoclusters, respectively. This band gap is ideal for various applications ranging from flexible nanoelectronics to nanophotonics applications. Furthermore, the adsorption of H2 molecules on both nano-heterostructures is investigated, and the computed binding energies are found to be within the desirable range. The reported theoretical results provide inspiration for engineering various optoelectronic applications for nanostructured MoS2-based heterostructures.

ACS Style

Saju Joseph; Simil Thomas; Jainy Mohan; Anusha Saji Kumar; Sruthi Thulaseedharan Jayasree; Sabu Thomas; Nandakumar Kalarikkal. Theoretical Study on Tuning Band Gap and Electronic Properties of Atomically Thin Nanostructured MoS2/Metal Cluster Heterostructures. ACS Omega 2021, 6, 6623 -6628.

AMA Style

Saju Joseph, Simil Thomas, Jainy Mohan, Anusha Saji Kumar, Sruthi Thulaseedharan Jayasree, Sabu Thomas, Nandakumar Kalarikkal. Theoretical Study on Tuning Band Gap and Electronic Properties of Atomically Thin Nanostructured MoS2/Metal Cluster Heterostructures. ACS Omega. 2021; 6 (10):6623-6628.

Chicago/Turabian Style

Saju Joseph; Simil Thomas; Jainy Mohan; Anusha Saji Kumar; Sruthi Thulaseedharan Jayasree; Sabu Thomas; Nandakumar Kalarikkal. 2021. "Theoretical Study on Tuning Band Gap and Electronic Properties of Atomically Thin Nanostructured MoS2/Metal Cluster Heterostructures." ACS Omega 6, no. 10: 6623-6628.