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Prof. Vijaya Rangari
Tuskegee University

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0 Polymer Composites
0 Sustainability
0 Sonochemistry
0 Biomaterial
0 Nano material application

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Communication
Published: 28 May 2021 in Ceramics
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A novel approach is demonstrated for the synthesis of the high entropy transition metal boride (Ta, Mo, Hf, Zr, Ti)B2 using a single heating step enabled by microwave-induced plasma. The argon-rich plasma allows rapid boro-carbothermal reduction of a consolidated powder mixture containing the five metal oxides, blended with graphite and boron carbide (B4C) as reducing agents. For plasma exposure as low as 1800 °C for 1 h, a single-phase hexagonal AlB2-type structure forms, with an average particle size of 165 nm and with uniform distribution of the five metal cations in the microstructure. In contrast to primarily convection-based (e.g., vacuum furnace) methods that typically require a thermal reduction step followed by conversion to the single high-entropy phase at elevated temperature, the microwave approach enables rapid heating rates and reduced processing time in a single heating step. The high-entropy phase purity improves significantly with the increasing of the ball milling time of the oxide precursors from two to eight hours. However, further improvement in phase purity was not observed as a result of increasing the microwave processing temperature from 1800 to 2000 °C (for fixed ball milling time). The benefits of microwave plasma heating, in terms of allowing the combination of boro-carbothermal reduction and high entropy single-phase formation in a single heating step, are expected to accelerate progress in the field of high entropy ceramic materials.

ACS Style

Bria Storr; Deepa Kodali; Kallol Chakrabarty; Paul Baker; Vijaya Rangari; Shane Catledge. Single-Step Synthesis Process for High-Entropy Transition Metal Boride Powders Using Microwave Plasma. Ceramics 2021, 4, 257 -264.

AMA Style

Bria Storr, Deepa Kodali, Kallol Chakrabarty, Paul Baker, Vijaya Rangari, Shane Catledge. Single-Step Synthesis Process for High-Entropy Transition Metal Boride Powders Using Microwave Plasma. Ceramics. 2021; 4 (2):257-264.

Chicago/Turabian Style

Bria Storr; Deepa Kodali; Kallol Chakrabarty; Paul Baker; Vijaya Rangari; Shane Catledge. 2021. "Single-Step Synthesis Process for High-Entropy Transition Metal Boride Powders Using Microwave Plasma." Ceramics 4, no. 2: 257-264.

Research article
Published: 22 May 2021 in Journal of Composite Materials
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Semi-crystalline carbon biochar is derived from spent coffee grounds (SCG) by a controlled pyrolysis process at high temperature/pressure conditions. Obtained biochar is characterized using XRD, SEM, and TEM techniques. Biochar particles are in the micrometer range with nanostructured morphologies. The SCG biochar thus produced is used as reinforcement in epoxy resin to 3 D print samples using the direct-write (DW) method with 1 and 3 wt. % loadings. Rheology results show that the addition of biochar makes resin viscous, enabling it to be stable soon after print; however, it could also lead to clogging of resin in printer head. The printed samples are characterized for chemical, thermal and mechanical properties using FTIR, TGA, DMA and flexure tests. Storage modulus improved with 1 wt. % biochar addition up to 27.5% and flexural modulus and strength increased up to 55.55% and 43.30% respectively. However, with higher loading of 3 wt. % both viscoelastic and flexural properties of 3D printed samples drastically reduced thus undermining the feasibility of 3D printing biochar reinforced epoxies at higher loadings.

ACS Style

Ahmed Alhelal; Zaheeruddin Mohammed; Shaik Jeelani; Vijaya K Rangari. 3D printing of spent coffee ground derived biochar reinforced epoxy composites. Journal of Composite Materials 2021, 1 .

AMA Style

Ahmed Alhelal, Zaheeruddin Mohammed, Shaik Jeelani, Vijaya K Rangari. 3D printing of spent coffee ground derived biochar reinforced epoxy composites. Journal of Composite Materials. 2021; ():1.

Chicago/Turabian Style

Ahmed Alhelal; Zaheeruddin Mohammed; Shaik Jeelani; Vijaya K Rangari. 2021. "3D printing of spent coffee ground derived biochar reinforced epoxy composites." Journal of Composite Materials , no. : 1.

Research article
Published: 23 April 2021 in ACS Sustainable Chemistry & Engineering
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Agricultural byproducts rich in lignocellulose are considered one of the most promising feedstocks to produce sustainable value-added materials with different industrial applications. However, fractionation into carbohydrates, lignin, and silica is a key challenge in the conversion of plant biomass into value-added products due to its complex structure. This study is designed to develop a novel method for sequential separation and collection of cellulose, hemicellulose, lignin, and silica from agricultural byproducts, peanut shell (PS), rice husk (RH), and sugar cane bagasse (SB), using an integrated approach under mild hydrolysis conditions. Silica and cellulose nanofibers (CNFs) were synthesized using an ultrasonic-assisted chemical method. Pure silica was obtained by further pyrolysis. The yield percent of cellulose was 35%, 39%, and 41% and hemicellulose and lignin combined was 30%, 18%, and 29% from PS, RH, and SB, respectively. The X-ray diffraction results demonstrated that CNFs were semicrystalline from all samples, and CNFs from SB had the highest crystallinity. Similarly, silica nanoparticles (SNPs) were amorphous in RH, while it was crystalline in both PS and SB. The surface morphologies of the CNFs and nanosized fibers were observed by field emission-scanning electron microscopy. It revealed that there were different morphological characteristics such as web-like, parallel, and tangled in PS, RH, and SB, respectively. The surface morphology of SNPs was also varied among the samples. In BET analysis, SNPs from RH had a larger specific surface area of 37.5 m2/g and total pore volume of 0.08 cc/g compared to SNPs from both PS and SB. The ascribed method could be a potential approach for comprehensive utilization of agricultural biomass through a relatively simple process, which can then be used for the biorefinery process or as a feedstock for the biomaterials industry. It is also suggested that the structural variations of CNFs/SNPs might be a vital factor to be considered for selecting optimal biomaterials.

ACS Style

Naresh Shahi; Pixiang Wang; Sushil Adhikari; Byungjin Min; Vijaya K. Rangari. Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts. ACS Sustainable Chemistry & Engineering 2021, 9, 6284 -6295.

AMA Style

Naresh Shahi, Pixiang Wang, Sushil Adhikari, Byungjin Min, Vijaya K. Rangari. Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts. ACS Sustainable Chemistry & Engineering. 2021; 9 (18):6284-6295.

Chicago/Turabian Style

Naresh Shahi; Pixiang Wang; Sushil Adhikari; Byungjin Min; Vijaya K. Rangari. 2021. "Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts." ACS Sustainable Chemistry & Engineering 9, no. 18: 6284-6295.

Book chapter
Published: 17 March 2021 in Composite Materials
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This chapter describes the coating of silicon carbide nanoparticles on different types of silicon dioxide that varied in size and shape using sonochemical method. These composite particles were further infused into polypropylene polymer to increase its thermal and mechanical properties for various applications. A two-step process was used to fabricate SiC/SiO2/polypropylene nanocomposites. In the first step, SiC nanoparticles were coated onto four different types of SiO2 nanoparticles. The coated nanoparticles were then characterized using a high resolution transmission electron microscope (TEM), X-ray diffraction (XRD) determined the morphology and crystalline structure, and X-ray photoelectron spectroscopy (XPS). These results showed that the nanoparticles were crystalline, spherical in shape, and were uniformly coated. In the second step, nanocomposite samples were extruded using a Wayne Yellow Label Top single screw extruder. The as prepared nanocomposite samples were then characterized for their thermal and mechanical properties. These properties show increase in their flexural strength and thermal degradation. These results show increase in mechanical properties. The importance of this work lies in the simple sonochemical synthesis of SiC/SiO2 hybrid nanomaterials and their filler applications in polypropylene polymer nanocomposites which are widely used for various application including automotive and electronic industries.

ACS Style

Vijaya Rangari; James Davis. Thermal and Mechanical Properties of Polypropylene Polymer Nanocomposites Infused with Sonochemically Coated SiC/SiO2 Nanoparticles. Composite Materials 2021, 1 .

AMA Style

Vijaya Rangari, James Davis. Thermal and Mechanical Properties of Polypropylene Polymer Nanocomposites Infused with Sonochemically Coated SiC/SiO2 Nanoparticles. Composite Materials. 2021; ():1.

Chicago/Turabian Style

Vijaya Rangari; James Davis. 2021. "Thermal and Mechanical Properties of Polypropylene Polymer Nanocomposites Infused with Sonochemically Coated SiC/SiO2 Nanoparticles." Composite Materials , no. : 1.

Short communication
Published: 14 March 2021 in Materials Letters
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Hybrid silica/carbon particles were synthesized from rice husk as sustainable precursor material. Synthesized material was subjected to low temperature plasma treatments in presence of different gas sources like Argon, Oxygen and Sulphur Hexafluoride. Effects of plasma treatments were characterized using various techniques. It was found that plasma treatments were effective in altering surface properties like surface binding energies, functionalities and morphology. Plasma treatments did not have any substantial effects on bulk properties of rice husk biochar. However, in case of oxygen plasma treatments it was found to be effective in surface level etching resulting in increased nanoporous structure.

ACS Style

Zaheeruddin Mohammed; Shaik Jeelani; Vijaya Rangari. Low temperature plasma treatment of rice husk derived hybrid silica/carbon biochar using different gas sources. Materials Letters 2021, 292, 129678 .

AMA Style

Zaheeruddin Mohammed, Shaik Jeelani, Vijaya Rangari. Low temperature plasma treatment of rice husk derived hybrid silica/carbon biochar using different gas sources. Materials Letters. 2021; 292 ():129678.

Chicago/Turabian Style

Zaheeruddin Mohammed; Shaik Jeelani; Vijaya Rangari. 2021. "Low temperature plasma treatment of rice husk derived hybrid silica/carbon biochar using different gas sources." Materials Letters 292, no. : 129678.

Article
Published: 05 March 2021 in Journal of Polymer Science
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Major limitation for use of epoxy thermosets in engineering applications is its sudden brittle failure. In the present study dipropylene glycol dibenzoate (DPGDB) based plasticizer is used to modify diglycidyl ether of bisphenol A (DEGEBA) based epoxy resin system via simple blending technique. Bio‐based epoxidized linseed oil was also used to modify epoxy resin system and compared with DPGDB modified resin. For DPGDB modified resin storage modulus and loss modulus of the epoxy system modified with 10% plasticizer increased by 7.54% and 12.24%, respectively. The primary mechanism responsible for such behavior is improved crosslinking density. With 5% plasticizer loading, flexural strength increased by 21%. There was an improvement of 312.74% in strain at failure for 10% plasticizer loading, while preserving its mechanical strength. It was found that DPGDB based modification was better than epoxidized linseed oil modification.

ACS Style

Chinedu Okoro; Zaheeruddin Mohammed; Shaik Jeelani; Vijaya Rangari. Plasticizing effect of biodegradable dipropylene glycol bibenzoate and epoxidized linseed oil on diglycidyl ether of bisphenol A based epoxy resin. Journal of Polymer Science 2021, 138, 50661 .

AMA Style

Chinedu Okoro, Zaheeruddin Mohammed, Shaik Jeelani, Vijaya Rangari. Plasticizing effect of biodegradable dipropylene glycol bibenzoate and epoxidized linseed oil on diglycidyl ether of bisphenol A based epoxy resin. Journal of Polymer Science. 2021; 138 (28):50661.

Chicago/Turabian Style

Chinedu Okoro; Zaheeruddin Mohammed; Shaik Jeelani; Vijaya Rangari. 2021. "Plasticizing effect of biodegradable dipropylene glycol bibenzoate and epoxidized linseed oil on diglycidyl ether of bisphenol A based epoxy resin." Journal of Polymer Science 138, no. 28: 50661.

Chapter
Published: 02 February 2021 in Introduction to Mechanical Engineering
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In this work, PMMA/SiO2 nanocomposites films were prepared by solution spinning technique. The aerosil silica weight percentage was varied to investigate the influence of nanoparticles on the polymer nanocomposites. The results showed overall improvement of the properties with the addition of the nanoparticle aerosil silica. The polymer nanocomposite of PMMA/SiO2, were synthesized in two different methods one starting with polymerization of monomer in the presence of silica using a catalyst and another one is to blending a commercial polymer with silica. The percentages of aerosol silica varied between 0 and 5 wt%. This nanocomposite was first manufactured as a thin film along with the commercially obtained PMMA (Lucite). The thermal characterizations revealed that the PMMA/SiO2 with 5 wt% exhibited the highest thermal stability and improvement over the neat PMMA and the Lucite. The tensile analysis also showed that the PMMA with 5 wt% had the best mechanical performance with ductile behavior however, the Lucite exhibited elastic behavior. The difference in mechanical behavior was a result of the commercial PMMA and the lab synthesized PMMA having different molecular weights. This work also shows that the addition of the SiO2 nanoparticle enhances the properties of the nanocomposites, allowing improved performance of the applications so that they may be used more efficiently in their applications such as automotive, protective coatings and biomedical applications.

ACS Style

Abiola Gaines; Deepa Kodali; Shaik Jeelani; Vijaya Rangari. Characterization and Processing of PMMA/SiO2 Nanocomposite Films and Their Applications. Introduction to Mechanical Engineering 2021, 119 -138.

AMA Style

Abiola Gaines, Deepa Kodali, Shaik Jeelani, Vijaya Rangari. Characterization and Processing of PMMA/SiO2 Nanocomposite Films and Their Applications. Introduction to Mechanical Engineering. 2021; ():119-138.

Chicago/Turabian Style

Abiola Gaines; Deepa Kodali; Shaik Jeelani; Vijaya Rangari. 2021. "Characterization and Processing of PMMA/SiO2 Nanocomposite Films and Their Applications." Introduction to Mechanical Engineering , no. : 119-138.

Journal article
Published: 16 November 2020 in Materials Research Express
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ACS Style

Deepa Kodali; Farooq Syed; Shaik Jeelani; Vijay Rangari. Fabrication and characterization of forcespun polycaprolactone microfiber scaffolds. Materials Research Express 2020, 1 .

AMA Style

Deepa Kodali, Farooq Syed, Shaik Jeelani, Vijay Rangari. Fabrication and characterization of forcespun polycaprolactone microfiber scaffolds. Materials Research Express. 2020; ():1.

Chicago/Turabian Style

Deepa Kodali; Farooq Syed; Shaik Jeelani; Vijay Rangari. 2020. "Fabrication and characterization of forcespun polycaprolactone microfiber scaffolds." Materials Research Express , no. : 1.

Journal article
Published: 12 November 2020 in Food Chemistry
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Nanoencapsulation provides new alternatives for the food industry, enabling a controlled and slow release of active antimicrobial agents, such as essential oils (EO). Poly (butylene adipate-co-terephthalate) (PBAT) nanocapsules loaded with linalool EO were prepared using an extrusion method with 1, 3, and 5% w/v (PBAT to chloroform). Nanocapsules' sizes ranged from 100 to 250 nm and were spherical. The release profile was studied using an ethanoic medium over 24 h, and according to the Korsmeyer-Peppas model, a Fick diffusion mechanism was involved. FT-IR and thermogravimetric analyses confirmed EO encapsulation with an encapsulation efficiency of 55%, 71%, and 74% for 1, 3, and 5%, respectively. The results indicated that encapsulation depended on organic phase concentration, with higher PBAT contents achieving better results. The resulting nanocapsules had antimicrobial activity against E. coli, which could be extended to develop active packaging systems.

ACS Style

Rennan Felix Da Silva Barbosa; Alana Gabrieli de Souza; Vijaya Rangari; Derval Dos Santos Rosa. The influence of PBAT content in the nanocapsules preparation and its effect in essential oils release. Food Chemistry 2020, 344, 128611 .

AMA Style

Rennan Felix Da Silva Barbosa, Alana Gabrieli de Souza, Vijaya Rangari, Derval Dos Santos Rosa. The influence of PBAT content in the nanocapsules preparation and its effect in essential oils release. Food Chemistry. 2020; 344 ():128611.

Chicago/Turabian Style

Rennan Felix Da Silva Barbosa; Alana Gabrieli de Souza; Vijaya Rangari; Derval Dos Santos Rosa. 2020. "The influence of PBAT content in the nanocapsules preparation and its effect in essential oils release." Food Chemistry 344, no. : 128611.

Journal article
Published: 01 November 2020 in Journal of Materials Research and Technology
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ACS Style

Vincent Hembrick-Holloman; Temesgen Samuel; Zaheeruddin Mohammed; Shaik Jeelani; Vijaya K. Rangari. Ecofriendly production of bioactive tissue engineering scaffolds derived from egg- and sea-shells. Journal of Materials Research and Technology 2020, 9, 13729 -13739.

AMA Style

Vincent Hembrick-Holloman, Temesgen Samuel, Zaheeruddin Mohammed, Shaik Jeelani, Vijaya K. Rangari. Ecofriendly production of bioactive tissue engineering scaffolds derived from egg- and sea-shells. Journal of Materials Research and Technology. 2020; 9 (6):13729-13739.

Chicago/Turabian Style

Vincent Hembrick-Holloman; Temesgen Samuel; Zaheeruddin Mohammed; Shaik Jeelani; Vijaya K. Rangari. 2020. "Ecofriendly production of bioactive tissue engineering scaffolds derived from egg- and sea-shells." Journal of Materials Research and Technology 9, no. 6: 13729-13739.

Article
Published: 12 October 2020 in Journal of Polymer Science
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In this study, the fabrication and characterization of bone ash filled biobased epoxy resin (Super SAP 100/1000, contains 37% biobased carbon content) nanocomposites are presented. Biosource bone ash was modified by size reduction and surface modification processes using a combination of ball milling and sonochemical techniques and characterized using X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. The modified bone ash particles were incorporated into biobased epoxy with noncontact mixing process. The as‐fabricated nanocomposites were characterized using various thermal and mechanical analyses. The nanocomposites showed significant improvement in flexural strength (41.25%) and modulus (34.56%) for 2 wt% filler loading. Dynamic mechanical analysis (DMA) results showed improvement in both storage modulus and loss modulus. Additionally, DMA results showed a slight reduction in glass transition temperature which also complies with differential scanning calorimetry results. Thermomechanical analysis results showed a reduction in the coefficient of thermal expansion. Thermogravimetric analysis results showed improved thermal stability at both onset of degradation and the major degradation. These enhanced thermal and mechanical performances of the epoxy nanocomposites allows them to be suitable for lightweight aerospace, automotive, and biomedical applications.

ACS Style

Md‐Jamal Uddin; Deepa Kodali; Vijaya K. Rangari. Effect of bone ash fillers on mechanical and thermal properties of biobased epoxy nanocomposites. Journal of Polymer Science 2020, 138, 1 .

AMA Style

Md‐Jamal Uddin, Deepa Kodali, Vijaya K. Rangari. Effect of bone ash fillers on mechanical and thermal properties of biobased epoxy nanocomposites. Journal of Polymer Science. 2020; 138 (12):1.

Chicago/Turabian Style

Md‐Jamal Uddin; Deepa Kodali; Vijaya K. Rangari. 2020. "Effect of bone ash fillers on mechanical and thermal properties of biobased epoxy nanocomposites." Journal of Polymer Science 138, no. 12: 1.

Journal article
Published: 24 September 2020 in Composites Part B: Engineering
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Environmental friendly plastics offer suitable alternatives to the hazardous non-degradable plastics. In this work, we explored biodegradable plastic created from BIOPLAST GF 106/02/PLA 75/25 blend (BPB) with carbon nanoparticles (CCSP10) derived from waste coconut shell. The CCSP nanoparticles were synthesized using high temperature/pressure reactor and characterized using analytical tools such as Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy to investigate the properties of as prepared carbon nanoparticles. The neat BIOPLAST GF 106/02 (BP) polymer and carbon infused BP polymer composite filaments were created from solvent based blending and extruded into filaments. The filament specimens were then characterized using thermogravimetric analysis (TGA), differential scanning calorimetric (DSC), tensile and electrical conductivity tests. The influence of extrusion and monodispersed size reduced particles have potentially increased the mechanical strength by altering the structure of the polymer blends. The polymer composite filaments of BPB infused with 0.2 wt %, 0.6 wt %, and 1 wt % carbon nanoparticles show increased mechanical strength. The tensile strength increased by 50% compared to neat BP filaments with the increase in carbon nanoparticles content up to 0.6 wt% and then decreased due to agglomeration of particles. TGA showed that the presence of CCSP resulted in additional decomposition and decreased weight loss. The electrical conductivity tests proved that increasing the filler content increased the conductivity. These filaments are designed for 3D printing of polymer composite applications.

ACS Style

Chibu O. Umerah; Deepa Kodali; Sydnei Head; Shaik Jeelani; Vijaya K. Rangari. Synthesis of carbon from waste coconutshell and their application as filler in bioplast polymer filaments for 3D printing. Composites Part B: Engineering 2020, 202, 108428 .

AMA Style

Chibu O. Umerah, Deepa Kodali, Sydnei Head, Shaik Jeelani, Vijaya K. Rangari. Synthesis of carbon from waste coconutshell and their application as filler in bioplast polymer filaments for 3D printing. Composites Part B: Engineering. 2020; 202 ():108428.

Chicago/Turabian Style

Chibu O. Umerah; Deepa Kodali; Sydnei Head; Shaik Jeelani; Vijaya K. Rangari. 2020. "Synthesis of carbon from waste coconutshell and their application as filler in bioplast polymer filaments for 3D printing." Composites Part B: Engineering 202, no. : 108428.

Journal article
Published: 16 September 2020 in Materials Chemistry and Physics
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This study focuses on the preparation and characterization of nanocomposite system with bio-based epoxy resin (Super SAP 100/1000, contains 37% bio-based carbon content) and natural clays including Georgian clay and Brazilian clay. Georgian clay was surface modified using an ultrasound processing in presence of Decalin. Brazilian clay was modified to organophilic bentonite using quaternary ammonium salts. The resulting nano clay particles were characterized using XRD and TEM to confirm the particle size reduction and uniform distribution. The as-fabricated nanocomposites were characterized using flexure, DMA, TMA and TGA. The flexure analysis showed that the modified clay composites have significant improvement in strength (23–38%) and modulus (28–37%). Delayed thermal degradation was observed from TGA analysis which showed that the major degradation temperatures improved from 7°-25°C. DMA and TMA analysis showed improvements in storage moduli (4–6%) and coefficient of thermal expansion (CTE) (6–64%), respectively. The notable improvement in thermal and mechanical properties suggested the effective dispersion and the high degree of polymer particle interaction. The bio based content present in the Super Sap 100/1000 acts as plasticizer resulting in the extensive ductility of the polymer.

ACS Style

Deepa Kodali; Md-Jamal Uddin; Esperidiana A.B. Moura; Vijay K. Rangari. Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites. Materials Chemistry and Physics 2020, 257, 123821 .

AMA Style

Deepa Kodali, Md-Jamal Uddin, Esperidiana A.B. Moura, Vijay K. Rangari. Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites. Materials Chemistry and Physics. 2020; 257 ():123821.

Chicago/Turabian Style

Deepa Kodali; Md-Jamal Uddin; Esperidiana A.B. Moura; Vijay K. Rangari. 2020. "Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites." Materials Chemistry and Physics 257, no. : 123821.

Journal article
Published: 27 July 2020 in Sustainability
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The development of cost-effective cellulose fibers by utilizing agricultural residues have been attracted by the scientific community in the past few years; however, a facile production route along with minimal processing steps and a significant reduction in harsh chemical use is still lacking. Here, we report a straightforward ultrasound-assisted method to extract cellulose nanofiber (CNF) from fibrous waste sugarcane bagasse. X-ray diffraction-based crystallinity calculation showed 25% increase in the crystallinity of the extracted CNF (61.1%) as compared to raw sugarcane bagasse (35.1%), which is coherent with Raman studies. Field emission scanning electron microscopy (FE-SEM) images revealed thread-like CNF structures. Furthermore, we prepared thin films of the CNF using hot press and solution casting method and compared their mechanical properties. Our experiments demonstrated that hot press is a more effective way to produce high strength CNF films; Young’s modulus of the thin films prepared from the hot press was ten times higher than the solution casting method. Our results suggest that a combination of ultrasound-based extraction and hot press-based film preparation is an efficient route of producing high strength CNF films.

ACS Style

Naresh Shahi; Byungjin Min; Bedanga Sapkota; Vijaya Rangari. Eco-Friendly Cellulose Nanofiber Extraction from Sugarcane Bagasse and Film Fabrication. Sustainability 2020, 12, 6015 .

AMA Style

Naresh Shahi, Byungjin Min, Bedanga Sapkota, Vijaya Rangari. Eco-Friendly Cellulose Nanofiber Extraction from Sugarcane Bagasse and Film Fabrication. Sustainability. 2020; 12 (15):6015.

Chicago/Turabian Style

Naresh Shahi; Byungjin Min; Bedanga Sapkota; Vijaya Rangari. 2020. "Eco-Friendly Cellulose Nanofiber Extraction from Sugarcane Bagasse and Film Fabrication." Sustainability 12, no. 15: 6015.

Journal article
Published: 22 January 2020 in JOM
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Polycaprolactone (PCL) polymer has been surface modified using oxygen low-temperature plasma and melt extruded into single filaments. Oxygen plasma was generated using a radiofrequency source with power of 150 W. The PCL polymer samples were treated with plasma for various durations of 5 min, 10 min, and 20 min. Water contact angle measurements were carried out to assess the wettability, revealing that the treatments reduced the contact angle by up to 11°. Changes in the chemical bonding and surface compositions were characterized by using x-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy, revealing a high concentration of oxygen functionalities on the surface. Crystallinity changes were studied by using x-ray diffraction analysis. The surface morphology of the polymer was investigated using field-emission scanning electron microscopy. The thermal degradation and melting behavior was studied using thermogravimetric analysis and differential scanning calorimetry, respectively.

ACS Style

Zaheeruddin Mohammed; Shaik Jeelani; Vijaya Rangari. Effect of Low-Temperature Plasma Treatment on Surface Modification of Polycaprolactone Pellets and Thermal Properties of Extruded Filaments. JOM 2020, 72, 1523 -1532.

AMA Style

Zaheeruddin Mohammed, Shaik Jeelani, Vijaya Rangari. Effect of Low-Temperature Plasma Treatment on Surface Modification of Polycaprolactone Pellets and Thermal Properties of Extruded Filaments. JOM. 2020; 72 (4):1523-1532.

Chicago/Turabian Style

Zaheeruddin Mohammed; Shaik Jeelani; Vijaya Rangari. 2020. "Effect of Low-Temperature Plasma Treatment on Surface Modification of Polycaprolactone Pellets and Thermal Properties of Extruded Filaments." JOM 72, no. 4: 1523-1532.

Journal article
Published: 07 November 2019 in Materials Today Communications
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A combination of mechanical methods was developed to obtain a suspension of nanocellulose (NC) from Eucalyptus sawdust. In this two-step process, the ball milling (1–4 h) was followed by a high-intensity ultrasound (10–30 min) irradiation. The prepared samples were characterized using Fourier-transform infrared spectroscopy, Raman, dynamic and static light scattering, Zeta potential, X-ray diffraction, X-ray photoelectron spectroscopy, Thermogravimetric analysis, Field-emission scanning electron microscopy, and Transmission electron microscopy. The crystallinity was calculated using different methods and compared. The mechanical grinding results in a random and irregular break of the fibers. In a combined method, the ultrasound waves generate more defibrillation and separation of the nanofibers and, consequently, the reduction of fiber diameters. The high-intensity ultrasound promoted an increase in the homogeneity, crystallinity, and electrostatic and thermal stability of the NC suspension. The samples milled for 2 h and 20 min ultrasound irradiation presented the high-efficiency in obtaining NC.

ACS Style

Rafaela R. Ferreira; Alana G. Souza; Lucas L. Nunes; Naresh Shahi; Vijaya K. Rangari; Derval Dos Santos Rosa. Use of ball mill to prepare nanocellulose from eucalyptus biomass: Challenges and process optimization by combined method. Materials Today Communications 2019, 22, 100755 .

AMA Style

Rafaela R. Ferreira, Alana G. Souza, Lucas L. Nunes, Naresh Shahi, Vijaya K. Rangari, Derval Dos Santos Rosa. Use of ball mill to prepare nanocellulose from eucalyptus biomass: Challenges and process optimization by combined method. Materials Today Communications. 2019; 22 ():100755.

Chicago/Turabian Style

Rafaela R. Ferreira; Alana G. Souza; Lucas L. Nunes; Naresh Shahi; Vijaya K. Rangari; Derval Dos Santos Rosa. 2019. "Use of ball mill to prepare nanocellulose from eucalyptus biomass: Challenges and process optimization by combined method." Materials Today Communications 22, no. : 100755.

Research article
Published: 02 May 2019 in International Journal of Biomaterials
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Nanocomposite electrospun fibers were fabricated from poly(lactic) acid (PLA) and needle-like hydroxyapatite nanoparticles made from eggshells. The X-ray diffraction spectrum and the scanning electron micrograph showed that the hydroxyapatite particles are highly crystalline and are needle-liked in shape with diameters between 10 and 20 nm and lengths ranging from 100 to 200 nm. The microstructural, thermal, and mechanical properties of the electrospun fibers were characterized using scanning electron microscope (SEM), thermogravimetric analysis (TGA), dynamic scanning calorimetry (DSC), and tensile testing techniques. The SEM study showed that both pristine and PLA/EnHA fibers surfaces exhibited numerous pores and rough edges suitable for cell attachment. The presence of the rod-liked EnHA particles was found to increase thermal and mechanical properties of PLA fibers relative to pristine PLA fibers. The confocal optical images showed that osteoblast cells were found to attach on dense pristine PLA and PLA/HA-10 wt% fibers after 48 hours of incubation. The stained confocal optical images indicated the secretion of cytoplasmic extension linking adjoining nuclei after 96 hours of incubation. These findings showed that eggshell based nanohydroxyapatite and poly(lactic acid) fibers could be potential scaffold for tissue regeneration.

ACS Style

Vitus A. Apalangya; Vijaya K. Rangari; Boniface J. Tiimob; Shaik Jeelani; Temesgen Samuel. Eggshell Based Nano-Engineered Hydroxyapatite and Poly(lactic) Acid Electrospun Fibers as Potential Tissue Scaffold. International Journal of Biomaterials 2019, 2019, 1 -11.

AMA Style

Vitus A. Apalangya, Vijaya K. Rangari, Boniface J. Tiimob, Shaik Jeelani, Temesgen Samuel. Eggshell Based Nano-Engineered Hydroxyapatite and Poly(lactic) Acid Electrospun Fibers as Potential Tissue Scaffold. International Journal of Biomaterials. 2019; 2019 ():1-11.

Chicago/Turabian Style

Vitus A. Apalangya; Vijaya K. Rangari; Boniface J. Tiimob; Shaik Jeelani; Temesgen Samuel. 2019. "Eggshell Based Nano-Engineered Hydroxyapatite and Poly(lactic) Acid Electrospun Fibers as Potential Tissue Scaffold." International Journal of Biomaterials 2019, no. : 1-11.

Journal article
Published: 01 March 2019 in Food Packaging and Shelf Life
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ACS Style

Manik C. Biswas; Boniface J. Tiimob; Woubit Abdela; Shaik Jeelani; Vijaya K. Rangari. Nano silica-carbon-silver ternary hybrid induced antimicrobial composite films for food packaging application. Food Packaging and Shelf Life 2019, 19, 104 -113.

AMA Style

Manik C. Biswas, Boniface J. Tiimob, Woubit Abdela, Shaik Jeelani, Vijaya K. Rangari. Nano silica-carbon-silver ternary hybrid induced antimicrobial composite films for food packaging application. Food Packaging and Shelf Life. 2019; 19 ():104-113.

Chicago/Turabian Style

Manik C. Biswas; Boniface J. Tiimob; Woubit Abdela; Shaik Jeelani; Vijaya K. Rangari. 2019. "Nano silica-carbon-silver ternary hybrid induced antimicrobial composite films for food packaging application." Food Packaging and Shelf Life 19, no. : 104-113.

Journal article
Published: 21 January 2019 in Journal of Composite Materials
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Subscription and open access journals from SAGE Publishing, the world's leading independent academic publisher.

ACS Style

Muhammad Imam; Shaik Jeelani; Vijaya K Rangari. Thermal decomposition and mechanical characterization of poly (lactic acid) and potato starch blend reinforced with biowaste SiO2. Journal of Composite Materials 2019, 53, 2315 -2334.

AMA Style

Muhammad Imam, Shaik Jeelani, Vijaya K Rangari. Thermal decomposition and mechanical characterization of poly (lactic acid) and potato starch blend reinforced with biowaste SiO2. Journal of Composite Materials. 2019; 53 (16):2315-2334.

Chicago/Turabian Style

Muhammad Imam; Shaik Jeelani; Vijaya K Rangari. 2019. "Thermal decomposition and mechanical characterization of poly (lactic acid) and potato starch blend reinforced with biowaste SiO2." Journal of Composite Materials 53, no. 16: 2315-2334.

Research article
Published: 09 September 2018 in ACS Sustainable Chemistry & Engineering
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Recently, the demand for high-performance, 3D-printable polymer composites has grown exponentially. The objective of this work is to develop a novel low cost and sustainable biochar-recycled poly(ethylene terephthalate) (PET) composite with improved mechanical and thermal performance. Biochar was derived from the pyrolysis of packaging waste at a high temperature and autogenic pressure. The typical temperature and pressure of the reaction are ∼1100 °C and 150 bar. Biochar was ground and sieved to below 100 μm, and it was melt compounded with recycled poly(ethylene terephthalate) derived from postconsumer PET bottles (Aquafina). Biochar/PET composite filaments of 1.75 mm were produced using a melt extruder. The filaments were used to 3D print tensile, DMA, and TMA sample coupons using a Hyrel 30 M printer. Biochar was analyzed for its textural properties, thermal stability, and surface morphology. The as-prepared polymer composite was studied for its thermal, mechanical, and dynamic mechanical properties. These results showed that the incorporation of biochar improved the composite mechanical, thermal, and dynamic properties. A 0.5 wt % biochar infusion in PET resulted in a 32% increase in tensile strength. The polymer composite with 5 wt % loading has shown a 60% increase in tensile modulus over neat PET. Moreover, biochar has significantly improved the composite dynamic modulus, dimensional stability, and thermal stability in an oxidative environment.

ACS Style

Mohanad Idrees; Shaik Jeelani; Vijaya Rangari. Three-Dimensional-Printed Sustainable Biochar-Recycled PET Composites. ACS Sustainable Chemistry & Engineering 2018, 6, 13940 -13948.

AMA Style

Mohanad Idrees, Shaik Jeelani, Vijaya Rangari. Three-Dimensional-Printed Sustainable Biochar-Recycled PET Composites. ACS Sustainable Chemistry & Engineering. 2018; 6 (11):13940-13948.

Chicago/Turabian Style

Mohanad Idrees; Shaik Jeelani; Vijaya Rangari. 2018. "Three-Dimensional-Printed Sustainable Biochar-Recycled PET Composites." ACS Sustainable Chemistry & Engineering 6, no. 11: 13940-13948.