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The nanotechnology-based nanofluid has extraordinary prospects in heat transfer engineering. Analysis of these applied nanofluids can yield the appropriate combinations of various useful physical parameters. In the present study, the incompressible boundary layer flow of a nanofluid in the presence of the variable chemical reaction, temperature-dependent viscosity, hydromagnetic force, and the radiation past an infinite vertical plate has been investigated. The governing nanofluid equations are simplified to ordinary differential equations, which are solved using the function bvp4c from MATLAB. The effects of the physical parameters including the similarity parameter, magnetic field, two dimensionless constant temperatures, Schmidt number, local Grashof number, radiation parameter, local chemical reaction parameter, kinematic diffusion parameter, and temperature-independent kinematic diffusion parameter on the velocity, temperature, concentration and the local Nusselt number are demonstrated. The results show that as the magnetic field parameter increases, the heat transfer decreases, and the increase of the radiation parameter yields the opposite effect. The kinematic diffusion and the chemical reaction parameters greatly stimulate the concentration of nanofluid and reduce the heat transfer.
Mosfiqur Rahman; Jashim Uddin. Magnetohydrodynamic boundary layer flow of nanofluid with variable chemical reaction in a radiative vertical plate. Heat Transfer 2021, 1 .
AMA StyleMosfiqur Rahman, Jashim Uddin. Magnetohydrodynamic boundary layer flow of nanofluid with variable chemical reaction in a radiative vertical plate. Heat Transfer. 2021; ():1.
Chicago/Turabian StyleMosfiqur Rahman; Jashim Uddin. 2021. "Magnetohydrodynamic boundary layer flow of nanofluid with variable chemical reaction in a radiative vertical plate." Heat Transfer , no. : 1.
Thermohydromagnetic performances of alumina–water nanofluid in a trapezoidal vessel that considered the inclined magnetic field were investigated numerically. The bottom wall of the enclosure is heated uniformly, whereas the upper wall is adiabatic. The remaining walls are kept cold. The mathematical problem was tackled through the Galerkin finite element method. The simulated results were verified with the experimental ones. The flow and thermal fields, and local and average Nusselt numbers for the pertinent parameters were investigated. The results showed that the heat transfer rate increased by 3.6% for the addition of 5% nanoparticle volumetric fraction within the base fluid. The heat transfer rate increased by 101% for the increment in Rayleigh number from 103 to 105. The heat transfer rate dwindled by 18% for the increase of Hartmann numbers’ intensity of 0–20.
J. Uddin; Arifuzzaman; Mohammad M. Rahman. Thermohydromagnetic Performance of Water–Alumina Nanofluid in a Trapezoidal Vessel. Journal of Thermophysics and Heat Transfer 2021, 1 -12.
AMA StyleJ. Uddin, Arifuzzaman, Mohammad M. Rahman. Thermohydromagnetic Performance of Water–Alumina Nanofluid in a Trapezoidal Vessel. Journal of Thermophysics and Heat Transfer. 2021; ():1-12.
Chicago/Turabian StyleJ. Uddin; Arifuzzaman; Mohammad M. Rahman. 2021. "Thermohydromagnetic Performance of Water–Alumina Nanofluid in a Trapezoidal Vessel." Journal of Thermophysics and Heat Transfer , no. : 1-12.
In recent times, the triboelectric and piezoelectric effects have garnered significant attention towards developing advanced material composites for energy harvesting and sensory applications. In this work, potassium sodium niobate (KNN) based energy films (EF) have been developed to utilize mechanical energy while simultaneously taking advantage of triboelectric and piezoelectric mechanisms. The KNN particles were synthesized using a wet ball milling technique and then incorporated into a polyvinylidene difluoride (PVDF) matrix together with addition of multi wall carbon nanotubes (MWCNT). The film was used to develop a piezoelectric nanogenerator (PENG) fitted with copper electrodes. The piezoelectric output of the film was further tested utilizing copper electrodes, at variable tapping frequency (60 BPM to 240 BPM) and pressure (10–40 psig) were used when activating the pneumatic piston. The open circuit voltage increased with the increase of both tapping frequency and pressure. The maximum piezoelectric output voltage was observed to be 35.3 V while the maximum current was noted as 15.8 µA. The films also showed unique output signals for different types of deformations performed under hand pressure. The film was further utilized to build a piezo-triboelectric hybrid nanogenerator to check its hybrid performance. The maximum output was observed to be 54.1 V and 29.4 µA. This film was integrated with conventional electronic components (bridge rectifiers, resistors, and capacitors) and tested for its ability to harvest energy. The hybrid nanogenerator can charge a 0.1 µF capacitor to 9.4 V in 60 s. The optimum output power for the device was measured to be 0.164 W. The film was further attached with a Kapton film and showed a hybrid output of 113.2 V. This experiment endorsed the potential of the KNN based energy films for multifunctional applications like force, pressure, and motion sensing as well as lead free energy harvesting.
Abu Musa Abdullah; Muhtasim Ul Karim Sadaf; Farzana Tasnim; Horacio Vasquez; Karen Lozano; M. Jasim Uddin. KNN based piezo-triboelectric lead-free hybrid energy films. Nano Energy 2021, 86, 106133 .
AMA StyleAbu Musa Abdullah, Muhtasim Ul Karim Sadaf, Farzana Tasnim, Horacio Vasquez, Karen Lozano, M. Jasim Uddin. KNN based piezo-triboelectric lead-free hybrid energy films. Nano Energy. 2021; 86 ():106133.
Chicago/Turabian StyleAbu Musa Abdullah; Muhtasim Ul Karim Sadaf; Farzana Tasnim; Horacio Vasquez; Karen Lozano; M. Jasim Uddin. 2021. "KNN based piezo-triboelectric lead-free hybrid energy films." Nano Energy 86, no. : 106133.
Due to unique photovoltaic properties, the nanostructured morphologies of TiO2 on flexible substrate have been studied extensively in the recent years for applications in dye sensitized solar cells (DSSCs). Microstructured electrode materials with high surface area can facilitate rapid charge transport and thus improve the light-to-current conversion efficiency. Herein we present an improved photoanode with forest like photoactive TiO2 hierarchical microstructure using a simple and facile hydrothermal route. To utilize the surface plasmon resonance (SPR) and hence increase the photon conversion efficiency, a plasmonic nanoparticle Ag has also been deposited using a very feasible photoreduction method. The branched structure of the photoanode increases the dye loading by filling the space between the nanowires, whereas Ag nanoparticles play the multiple roles of dye absorption and light scattering to increase the light-to-current conversion efficiency of the device. The branched structure provides a suitable matrix for the subsequent Ag deposition. They improve the charge collection efficiency by providing the preferential electron pathways. The high-density Ag nanoparticles deposited on the forest like structure also decrease the charge recombination and therefore improve the photovoltaic efficiency of the cells. As a result, the DSSC based on this novel photoanode shows remarkably higher photon conversion efficiency (ηmax = 4.0% and ηopt = 3.15%) compared to the device based on pristine nanowire or forest-like TiO2 structure. The flexibility of the device showed sustainable and efficient performance of the microcells.
Brishty Deb Choudhury; Chen Lin; Sk Md Ali Zaker Shawon; Javier Soliz-Martinez; Hasina Huq; Mohammed Jasim Uddin. A photoanode with hierarchical nanoforest TiO2 structure and silver plasmonic nanoparticles for flexible dye sensitized solar cell. Scientific Reports 2021, 11, 1 -11.
AMA StyleBrishty Deb Choudhury, Chen Lin, Sk Md Ali Zaker Shawon, Javier Soliz-Martinez, Hasina Huq, Mohammed Jasim Uddin. A photoanode with hierarchical nanoforest TiO2 structure and silver plasmonic nanoparticles for flexible dye sensitized solar cell. Scientific Reports. 2021; 11 (1):1-11.
Chicago/Turabian StyleBrishty Deb Choudhury; Chen Lin; Sk Md Ali Zaker Shawon; Javier Soliz-Martinez; Hasina Huq; Mohammed Jasim Uddin. 2021. "A photoanode with hierarchical nanoforest TiO2 structure and silver plasmonic nanoparticles for flexible dye sensitized solar cell." Scientific Reports 11, no. 1: 1-11.
Performance of triboelectric nanogenerators for harvesting mechanical energy from the ambient environment has been limited by structural complexity, cost‐effectiveness, and mechanical weakness of materials. Here, we report on a cost‐effective vertical contact separation mode triboelectric nanogenerator using PE and PC in a regular digital versatile disc. This cost‐effective nanogenerator with simplified structures was able to generate an open circuit voltage of 215.3 V and short circuit current of 80 µA. The effects of the distance of impact and the air gap between the triboelectric layers have also been tested from 3 to 9 cm, and 0.25 to 1 cm, respectively. It was determined that 0.5 cm was the optimal air gap. The nanogenerator was also tested in different real‐life scenarios including stresses produced by a moving car, walking, and a rolling skateboard over the nanogenerator. The surfaces of the triboelectric layers were further modified by surface‐charge engineering which induced a 460% increase in the output power. These tests revealed a significant electrical response and mechanical stability under stress. In summary, this study demonstrated that the relatively inexpensive PE and PC triboelectric pair has the potential to be used for highly efficient, mechanically robust triboelectric nanogenerators.
Diana Lopez; Aminur Rashid Chowdhury; Abu Musa Abdullah; Muhtasim Ul Karim Sadaf; Isaac Martinez; Brishty Deb Choudhury; Serena Danti; Christopher J. Ellison; Karen Lozano; M. Jasim Uddin. Polymer Based Triboelectric Nanogenerator for Cost‐Effective Green Energy Generation and Implementation of Surface‐Charge Engineering. Energy Technology 2021, 1 .
AMA StyleDiana Lopez, Aminur Rashid Chowdhury, Abu Musa Abdullah, Muhtasim Ul Karim Sadaf, Isaac Martinez, Brishty Deb Choudhury, Serena Danti, Christopher J. Ellison, Karen Lozano, M. Jasim Uddin. Polymer Based Triboelectric Nanogenerator for Cost‐Effective Green Energy Generation and Implementation of Surface‐Charge Engineering. Energy Technology. 2021; ():1.
Chicago/Turabian StyleDiana Lopez; Aminur Rashid Chowdhury; Abu Musa Abdullah; Muhtasim Ul Karim Sadaf; Isaac Martinez; Brishty Deb Choudhury; Serena Danti; Christopher J. Ellison; Karen Lozano; M. Jasim Uddin. 2021. "Polymer Based Triboelectric Nanogenerator for Cost‐Effective Green Energy Generation and Implementation of Surface‐Charge Engineering." Energy Technology , no. : 1.
Functional materials are promising candidates for application in structural health monitoring/self-healing composites, wearable systems (smart textiles), robotics, and next-generation electronics. Any improvement in these topics would be of great relevance to industry, environment, and global needs for energy sustainability. Taking into consideration all these aspects, low-cost fabrication of electrical functionalities on the outer surface of carbon-nanotube/polypropylene composites is presented in this paper. Electrical-responsive regions and conductive tracks, made of an accumulation layer of carbon nanotubes without the use of metals, have been obtained by the laser irradiation process, leading to confined polymer melting/vaporization with consequent local increase of the nanotube concentration over the electrical percolation threshold. Interestingly, by combining different investigation methods, including thermogravimetric analyses (TGA), X-ray diffraction (XRD) measurements, scanning electron and atomic force microscopies (SEM, AFM), and Raman spectroscopy, the electrical properties of multi-walled carbon nanotube/polypropylene (MWCNT/PP) composites have been elucidated to unfold their potentials under static and dynamic conditions. More interestingly, prototypes made of simple components and electronic circuits (resistor, touch-sensitive devices), where conventional components have been substituted by the carbon nanotube networks, are shown. The results contribute to enabling the direct integration of carbon conductive paths in conventional electronics and next-generation platforms for low-power electronics, sensors, and devices.
Federico Cesano; Mohammed Uddin; Alessandro Damin; Domenica Scarano. Multifunctional Conductive Paths Obtained by Laser Processing of Non-Conductive Carbon Nanotube/Polypropylene Composites. Nanomaterials 2021, 11, 604 .
AMA StyleFederico Cesano, Mohammed Uddin, Alessandro Damin, Domenica Scarano. Multifunctional Conductive Paths Obtained by Laser Processing of Non-Conductive Carbon Nanotube/Polypropylene Composites. Nanomaterials. 2021; 11 (3):604.
Chicago/Turabian StyleFederico Cesano; Mohammed Uddin; Alessandro Damin; Domenica Scarano. 2021. "Multifunctional Conductive Paths Obtained by Laser Processing of Non-Conductive Carbon Nanotube/Polypropylene Composites." Nanomaterials 11, no. 3: 604.
Over the years, nanogenerators for health monitoring have become more and more attractive as they provide a cost-effective and continuous way to successfully measure vital signs, physiological status, and environmental changes in/around a person. Using such sensors can positively affect the way healthcare workers diagnose and prevent life-threatening conditions. Recently, the dual piezo-tribological effect of hybrid nanogenerators (HBNGs) have become a subject of investigation, as they can provide a substantial amount of data, which is significant for healthcare. However, real-life exploitation of these HBNGs in health monitoring is still marginal. This review covers piezo-tribo dual-effect HBNGs that are used as sensors to measure the different movements and changes in the human body such as blood circulation, respiration, and muscle contractions. Piezo-tribo dual-effect HBNGs are applicable within various healthcare settings as a means of powering noninvasive sensors, providing the capability of constant patient monitoring without interfering with the range of motion or comfort of the user. This review also intends to suggest future improvements in HBNGs. These include incorporating surface modification techniques, utilizing nanowires, nanoparticle technologies, and other means of chemical surface modifications. These improvements can contribute significantly in terms of the electrical output of the HBNGs and can enhance their prospects of applications in the field of health monitoring, as well as various in vitro/in vivo biomedical applications. While a promising option, improved HBNGs are still lacking. This review also discusses the technical issue which has prevented so far, the real use of these sensors.
Sk Md Ali Zaker Shawon; Andrew Xu Sun; Valeria Suarez Vega; Brishty Deb Chowdhury; Phong Tran; Zaida D. Carballo; Jim Aica Tolentino; Jianzhi Li; Muhammad Sufian Rafaqut; Serena Danti; M. Jasim Uddin. Piezo-tribo dual effect hybrid nanogenerators for health monitoring. Nano Energy 2020, 82, 105691 .
AMA StyleSk Md Ali Zaker Shawon, Andrew Xu Sun, Valeria Suarez Vega, Brishty Deb Chowdhury, Phong Tran, Zaida D. Carballo, Jim Aica Tolentino, Jianzhi Li, Muhammad Sufian Rafaqut, Serena Danti, M. Jasim Uddin. Piezo-tribo dual effect hybrid nanogenerators for health monitoring. Nano Energy. 2020; 82 ():105691.
Chicago/Turabian StyleSk Md Ali Zaker Shawon; Andrew Xu Sun; Valeria Suarez Vega; Brishty Deb Chowdhury; Phong Tran; Zaida D. Carballo; Jim Aica Tolentino; Jianzhi Li; Muhammad Sufian Rafaqut; Serena Danti; M. Jasim Uddin. 2020. "Piezo-tribo dual effect hybrid nanogenerators for health monitoring." Nano Energy 82, no. : 105691.
Since the invention of Piezoelectric Nanogenerator in 2006, nanogenerators has become an attractive technology to the researchers for scavenging mechanical energy from the ambient environment for real life applications. Hybridization of these nanogenerators has been one of the effective techniques to maximize its output performance. In this work, a Triboelectric Nanogenerator (TENG) and Electro Magnetic Generator (EMG) based hybrid floor-tile has been developed to utilize the biomechanical energy from human footsteps. The TENG consists of oppositely charged layers of conductive aluminum and high-polarized Kapton with a layer of MoS2 as electron acceptor. On the other hand, the EMG is composed of copper coils and neodymium magnets. The output open circuit voltage and short circuit current of the device was tested at variable load (50 l b, 100 l b and 200 l b) and frequency of footsteps (60BPM, 90BPM, 120BPM). The device was further integrated with a bridge rectifier to test its capability to convert Alternative Current (AC) signal into Direct Current (DC) signal. The maximum open circuit voltage and short-circuit current was noted as 1200 V and 5 mA respectively. The output power of this energy harvesting device can be high as 6 W. This hybrid nanogenerator produces 25 times more open-circuit voltage and 20% more power in comparison to a commercially sold energy-harvester floor tile, Pavegen. The developed hybrid NG based floor-tile allows for cost-effective, green, and sustainable energy conversion and promotes sustainable development.
Elaijah Islam; Abu Musa Abdullah; Aminur Rashid Chowdhury; Farzana Tasnim; Madelyne Martinez; Carolina Olivares; Karen Lozano; M. Jasim Uddin. Electromagnetic-triboelectric-hybrid energy tile for biomechanical green energy harvesting. Nano Energy 2020, 77, 105250 .
AMA StyleElaijah Islam, Abu Musa Abdullah, Aminur Rashid Chowdhury, Farzana Tasnim, Madelyne Martinez, Carolina Olivares, Karen Lozano, M. Jasim Uddin. Electromagnetic-triboelectric-hybrid energy tile for biomechanical green energy harvesting. Nano Energy. 2020; 77 ():105250.
Chicago/Turabian StyleElaijah Islam; Abu Musa Abdullah; Aminur Rashid Chowdhury; Farzana Tasnim; Madelyne Martinez; Carolina Olivares; Karen Lozano; M. Jasim Uddin. 2020. "Electromagnetic-triboelectric-hybrid energy tile for biomechanical green energy harvesting." Nano Energy 77, no. : 105250.
The anatase to rutile phase transformation via thermal and chemical (HF etching) routes of TiO2 P25 has been investigated. The treatment parameters and properties of the resulting anatase and rutile nanoparticles are analyzed and discussed. Since the nature of TiO2 surfaces plays a significant role in determining the physical and chemical properties of the TiO2 nanoparticles, it is important to investigate the surface properties, including the morphology, the main exposed faces, the defectiveness, to be correlated with their peculiar properties, and then reactivity. Herein, we report an infrared spectroscopy investigation, employing the adsorption of CO probe molecule at low temperature, including 12CO and 12CO-13CO isotopic mixtures, at the surface sites of TiO2 P25, previously heated from room temperature to 1,023 K under vacuum conditions. The same FTIR experiments were adopted on HF-etched TiO2. X-ray diffraction and transmission electron microscopy analyses were adopted to elucidate the role played by the thermal and the HF-etching treatments in modifying not only the distribution of exposed surfaces, but even the phase composition of the pristine TiO2 P25 samples, which are initially dominated by the most thermodynamically stable (101) facets of the anatase phase. The present study helps in the crystal and exposed facet engineering for the development of highly efficient photocatalysts.
M. Jasim Uddin; Federico Cesano; Aminur Rashid Chowdhury; Tarek Trad; Sara Cravanzola; Gianmario Martra; Lorenzo Mino; Adriano Zecchina; Domenica Scarano. Surface Structure and Phase Composition of TiO2 P25 Particles After Thermal Treatments and HF Etching. Frontiers in Materials 2020, 7, 1 .
AMA StyleM. Jasim Uddin, Federico Cesano, Aminur Rashid Chowdhury, Tarek Trad, Sara Cravanzola, Gianmario Martra, Lorenzo Mino, Adriano Zecchina, Domenica Scarano. Surface Structure and Phase Composition of TiO2 P25 Particles After Thermal Treatments and HF Etching. Frontiers in Materials. 2020; 7 ():1.
Chicago/Turabian StyleM. Jasim Uddin; Federico Cesano; Aminur Rashid Chowdhury; Tarek Trad; Sara Cravanzola; Gianmario Martra; Lorenzo Mino; Adriano Zecchina; Domenica Scarano. 2020. "Surface Structure and Phase Composition of TiO2 P25 Particles After Thermal Treatments and HF Etching." Frontiers in Materials 7, no. : 1.
Abu Musa Abdullah; Alejandro Flores; Aminur Rashid Chowdhury; Jianzhi Li; Yuanbing Mao; M. Jasim Uddin. Corrigendum to “Synthesis and fabrication of self-sustainable triboelectric energy case for powering smart electronic devices” [Nano Energy, Volume 73, July 2020, 104774]. Nano Energy 2020, 76, 104996 .
AMA StyleAbu Musa Abdullah, Alejandro Flores, Aminur Rashid Chowdhury, Jianzhi Li, Yuanbing Mao, M. Jasim Uddin. Corrigendum to “Synthesis and fabrication of self-sustainable triboelectric energy case for powering smart electronic devices” [Nano Energy, Volume 73, July 2020, 104774]. Nano Energy. 2020; 76 ():104996.
Chicago/Turabian StyleAbu Musa Abdullah; Alejandro Flores; Aminur Rashid Chowdhury; Jianzhi Li; Yuanbing Mao; M. Jasim Uddin. 2020. "Corrigendum to “Synthesis and fabrication of self-sustainable triboelectric energy case for powering smart electronic devices” [Nano Energy, Volume 73, July 2020, 104774]." Nano Energy 76, no. : 104996.
Versatile applications of triboelectric nanogenerator as a microsystem component has widened the access to advanced healthcare monitoring and green energy systems. Recent research on wearable electronic technologies has been focusing on more complex architecture and costly materials for sensory applications resulting in less commercial feasibility. Here we report a biocompatible, cost‐effective, highly sensible, structurally simple, multifunctional and wearable triboelectric nanogenerator (TENG) as a universal health monitoring device. This triboelectric universal health monitoring device (TUHMD) was fabricated with cellulose paper and Polydimethylsiloxane (PDMS)/Polytetrafluoroethylene (PTFE) copolymer electrodes. This device demonstrated high sensitivity and notable identical signals on diverse body motions related to body muscles and respiratory system by mechanical triggering. The device was also observed to be sensitive to vocal cord vibration. Integration of this device with computer aided system offers realtime data of physiological movement, potentially useful for personalized medicine, rehabilitation and remote monitoring of patients. The device was also tested from 30 to 90 Beat Per Minute (BPM) load frequencies to observe the triboelectric performance of the device. TUHMD showed response as a triboelectric nanogenerator with a range of 12 V with negligible charge accumulation, along with a maximum capacitive performance of 11 F. This smart device showed a potential to be an advanced biomedical sensor for maintaining full health care or monitoring applications.
Aminur Rashid Chowdhury; Abu Musa Abdullah; Ulises Vidaurri Romero; Istiak Hussain; Carolina Olivares; Serena Danti; Jianzhi Li; Mohammed Jasim Uddin. Decentralized triboelectric electronic health monitoring flexible microdevice. MEDICAL DEVICES & SENSORS 2020, 3, 1 .
AMA StyleAminur Rashid Chowdhury, Abu Musa Abdullah, Ulises Vidaurri Romero, Istiak Hussain, Carolina Olivares, Serena Danti, Jianzhi Li, Mohammed Jasim Uddin. Decentralized triboelectric electronic health monitoring flexible microdevice. MEDICAL DEVICES & SENSORS. 2020; 3 (6):1.
Chicago/Turabian StyleAminur Rashid Chowdhury; Abu Musa Abdullah; Ulises Vidaurri Romero; Istiak Hussain; Carolina Olivares; Serena Danti; Jianzhi Li; Mohammed Jasim Uddin. 2020. "Decentralized triboelectric electronic health monitoring flexible microdevice." MEDICAL DEVICES & SENSORS 3, no. 6: 1.
In recent times, Triboelectric Nanogenerators (TENG) have attained the focus of the scientific community due to its potential as a medium to harvest mechanical energy from the ambient environment. Human motion has been attributed as a source of mechanical energy to drive electronic devices and sensors through TENG. Based on the principles of single electrode TENG, we have developed a Triboelectricity based Stepping and Tapping Energy Case (TESTEC) which magnifies the prospect to power touch electronic devices by utilizing finger tapping and stepping motion. This novel case was constructed with two single electrode TENG operating through the triboelectric mechanism between human skin and Polyethylene terephthalate (PET) film on the front part and Nitrile Butadiene Rubber (NBR) and PET film on the back part. This cost effective device was further tested by attaching with a cell phone at variable load frequency, airgap and finger combinations where the output response increased with the increased frequencies (60–240 BPM) and air gap (1 cm–5 cm). Maximum output voltages of 14.8 V and 50.8 V were obtained for the front and back parts, respectively. Besides, maximum output powers were observed to be 3.78 W/m2 at 0.46 MΩ and 6.21 W/m2 at 1.02 MΩ, respectively. Also, the device was tested by integrating with conventional electronic components including capacitors, bridge rectifiers and 15 LEDs. Based on the results, a electrical circuit has been proposed to power touch cell phones. The device was further modified using Silver (Ag) nanoparticles in the front part. The modified TESTEC provided higher output response compared to the primary TESTEC. The TESTEC can be a self sustainable way to power touch electronic devices which can reudce the necessity to charge electronics devices in the conventional way.
Abu Musa Abdullah; Alejandro Flores; Aminur Rashid Chowdhury; Jianzhi Li; Yuanbing Mao; M. Jasim Uddin. Synthesis and fabrication of self-sustainable triboelectric energy case for powering smart electronic devices. Nano Energy 2020, 73, 104774 .
AMA StyleAbu Musa Abdullah, Alejandro Flores, Aminur Rashid Chowdhury, Jianzhi Li, Yuanbing Mao, M. Jasim Uddin. Synthesis and fabrication of self-sustainable triboelectric energy case for powering smart electronic devices. Nano Energy. 2020; 73 ():104774.
Chicago/Turabian StyleAbu Musa Abdullah; Alejandro Flores; Aminur Rashid Chowdhury; Jianzhi Li; Yuanbing Mao; M. Jasim Uddin. 2020. "Synthesis and fabrication of self-sustainable triboelectric energy case for powering smart electronic devices." Nano Energy 73, no. : 104774.
Organic photovoltaic devices have long been considered as an important alternative for coal-based energy technologies due to their low-cost, lightweight and flexible nature. However, the power conversion efficiencies of such cells are limited by thermalization and transmission losses, which can be overcome by stacking multiple cells in a tandem configuration. This approach allows utilization of the wider spectrum of solar light, helping in attaining the theoretical limits for single cell efficiency (~30%). However, the performance of such tandem organic solar cells depends largely on several factors, including the proper design of absorber, sub-cells and interconnecting layer materials. In this review, recent studies on the development of different fullerene, non-fullerene, small molecule acceptor based active layers have been reported. Also, some recent works in the field of the inorganic-organic hybrid tandem cells have been briefly discussed. The purpose of this review is manifold: to provide the readers with a comprehensive overview of past, current research, recent developments, and open problems of tandem organic solar cells.
Brishty Deb Choudhury; Bernabe Ibarra; Federico Cesano; Yuanbing Mao; Muhammad N. Huda; Aminur Rashid Chowdhury; Carolina Olivares; M. Jasim Uddin. The photon absorber and interconnecting layers in multijunction organic solar cell. Solar Energy 2020, 201, 28 -44.
AMA StyleBrishty Deb Choudhury, Bernabe Ibarra, Federico Cesano, Yuanbing Mao, Muhammad N. Huda, Aminur Rashid Chowdhury, Carolina Olivares, M. Jasim Uddin. The photon absorber and interconnecting layers in multijunction organic solar cell. Solar Energy. 2020; 201 ():28-44.
Chicago/Turabian StyleBrishty Deb Choudhury; Bernabe Ibarra; Federico Cesano; Yuanbing Mao; Muhammad N. Huda; Aminur Rashid Chowdhury; Carolina Olivares; M. Jasim Uddin. 2020. "The photon absorber and interconnecting layers in multijunction organic solar cell." Solar Energy 201, no. : 28-44.
Nanofluids have garnered significant attention in the scientific and engineering research communities due to their enhanced heat transfer properties when compared to conventional thermal fluids. Nanofluids comprised of titanium dioxide (TiO2) nanoparticles have a wide range of applications due to their excellent thermophysical properties like thermal conductivity and viscosity, environmentally friendly nature, and low cost. This article reviews major research advances in homogeneous water (H2O) and ethylene glycol (EG, HO(CH2)2OH) based TiO2 nanofluids compared to hybrid TiO2 nanofluids. This review focuses on viscosity measurements and rheological behavior of the aforementioned nanofluids at various temperatures and TiO2 particle concentrations. Besides, the effect of sonication time, particle size, and base fluid mixture on the viscosity of TiO2 nanofluids has been included in this study. The classical and experimental models of viscosity have been reviewed as well. Furthermore, nanofluid preparation methods, characterization, and measurement techniques have been examined and discussed. Previous studies clearly show that the viscosity of TiO2 nanofluids is a noteworthy function of both temperature and nanoparticle concentration. Viscosity is observed to significantly increase with particle concentration and decrease with temperature. Nanofluids are also observed to exhibit dissimilar rheological behavior under different experimental conditions. Additionally, increases in viscosity has also been discussed with respect to the base of nanofluids. The hybridization of TiO2 nanofluids, as well as combinations of ethylene glycol and water, have shown substantial effects on the viscosity of the nanofluids. These results provide important characteristics that should be considered during various engineering applications of TiO2 nanofluids.
Abu Musa Abdullah; Aminur Rashid Chowdhury; Yingchen Yang; Horacio Vasquez; H. Justin Moore; Jason G. Parsons; Karen Lozano; Jose J. Gutierrez; Karen S. Martirosyan; M. Jasim Uddin. Tailoring the viscosity of water and ethylene glycol based TiO2 nanofluids. Journal of Molecular Liquids 2019, 297, 111982 .
AMA StyleAbu Musa Abdullah, Aminur Rashid Chowdhury, Yingchen Yang, Horacio Vasquez, H. Justin Moore, Jason G. Parsons, Karen Lozano, Jose J. Gutierrez, Karen S. Martirosyan, M. Jasim Uddin. Tailoring the viscosity of water and ethylene glycol based TiO2 nanofluids. Journal of Molecular Liquids. 2019; 297 ():111982.
Chicago/Turabian StyleAbu Musa Abdullah; Aminur Rashid Chowdhury; Yingchen Yang; Horacio Vasquez; H. Justin Moore; Jason G. Parsons; Karen Lozano; Jose J. Gutierrez; Karen S. Martirosyan; M. Jasim Uddin. 2019. "Tailoring the viscosity of water and ethylene glycol based TiO2 nanofluids." Journal of Molecular Liquids 297, no. : 111982.
The purpose of this paper is to formulate and analyze a nano‐bio transport model for magnetohydrodynamic convective flow, heat, and mass diffusion of micropolar fluid containing gyrotactic microorganisms through a horizontal channel. Both the walls are considered to be stretched, and the Navier slip boundary condition is taken into account. The governing bio‐nano transport partial differential equations are rendered to ordinary differential equations using similarity variables. The resulting normalized self‐similar boundary value problem is solved computationally with the Matlab bvp4c function. The effect of the controlling parameters on the nondimensional velocity, temperature, nanoparticle concentration, and motile microorganism density functions, and their gradients at the wall are visualized graphically and in a tabular form and expounded at length. Validation with a previous simpler model is included. All physical quantities, except the local Nusselt number, increases with an increase in the velocity slip and magnetic parameters. The present problem finds applications in industries related to pharmaceutical, nanofluidic devices, microbial enhanced oil recovery, modeling oil, and gas‐bearing sedimentary basins.
Fatema T. Zohra; Mohammed J. Uddin; Ahamd I. M. Ismail. Magnetohydrodynamic bio-nanoconvective Naiver slip flow of micropolar fluid in a stretchable horizontal channel. Heat Transfer-Asian Research 2019, 48, 3636 -3656.
AMA StyleFatema T. Zohra, Mohammed J. Uddin, Ahamd I. M. Ismail. Magnetohydrodynamic bio-nanoconvective Naiver slip flow of micropolar fluid in a stretchable horizontal channel. Heat Transfer-Asian Research. 2019; 48 (8):3636-3656.
Chicago/Turabian StyleFatema T. Zohra; Mohammed J. Uddin; Ahamd I. M. Ismail. 2019. "Magnetohydrodynamic bio-nanoconvective Naiver slip flow of micropolar fluid in a stretchable horizontal channel." Heat Transfer-Asian Research 48, no. 8: 3636-3656.
Gavi, the Vaccine Alliance, supported a mass vaccination Measles-Rubella Campaign (MRC) in Bangladesh during January–February 2014. We conducted a mixed-method process evaluation to understand the successes and challenges in implementation of the MRC. We reviewed documents for the MRC and the immunization programme in Bangladesh; observed meetings, vaccination sessions, and health facilities; and conducted 58 key informant interviews, 574 exit interviews with caregivers and 156 brief surveys with stakeholders involved in immunization. Our theory of Change for vaccination delivery guided our assessment of ideal implementation milestones and indicators to compare with the actual implementation processes. We identified challenges relating to country-wide political unrest, administrative and budgetary delays, shortage of transportation, problems in registration of target populations, and fears about safety of the vaccine. Despite these issues, a number of elements contributed to the successful launch of the MRC. These included: the comprehensive design of the campaign; strong partnerships between immunization authorities in the government system, Alliance partners, and civil society actors; and motivated and skilled health workers at different levels of the health system. The successful implementation of the MRC in spite of numerous contextual and operational challenges demonstrated the adaptive capacity of the national immunization programme and its partners that has positive implications for future introductions of Gavi-supported vaccines.
Haribondhu Sarma; Ashwin Budden; Sharmin Khan Luies; Stephen S. Lim; Shamsuzzaman; Tahmina Sultana; Julie K. Rajaratnam; Laura Craw; Cathy Banwell; Wazed Ali; Jasim Uddin. Implementation of the World’s largest measles-rubella mass vaccination campaign in Bangladesh: a process evaluation. BMC Public Health 2019, 19, 1 -10.
AMA StyleHaribondhu Sarma, Ashwin Budden, Sharmin Khan Luies, Stephen S. Lim, Shamsuzzaman, Tahmina Sultana, Julie K. Rajaratnam, Laura Craw, Cathy Banwell, Wazed Ali, Jasim Uddin. Implementation of the World’s largest measles-rubella mass vaccination campaign in Bangladesh: a process evaluation. BMC Public Health. 2019; 19 (1):1-10.
Chicago/Turabian StyleHaribondhu Sarma; Ashwin Budden; Sharmin Khan Luies; Stephen S. Lim; Shamsuzzaman; Tahmina Sultana; Julie K. Rajaratnam; Laura Craw; Cathy Banwell; Wazed Ali; Jasim Uddin. 2019. "Implementation of the World’s largest measles-rubella mass vaccination campaign in Bangladesh: a process evaluation." BMC Public Health 19, no. 1: 1-10.
This paper studies the combined effects of viscous dissipation, first and second-order slip and variable transport properties on phase-change hydromagnetic bio-nanofluid convection flow from a stretching sheet. Nanoscale materials possess a much larger surface to volume ratio than bulk materials, significantly modifying their thermodynamic and thermal properties and substantially lowering the melting point. Gyrotactic non-magnetic micro-organisms are present in the nanofluid. The transport properties are assumed to be dependent on concentration and temperature. Via appropriate similarity variables, the governing equation with boundary conditions are converted to nonlinear ordinary differential equations and are solved using the BVP4C subroutine in the symbolic software MATLAB. The non-dimensional boundary value features a melting (phase change) parameter, temperature-dependent thermal conductive parameter, first as well as second-order slip parameters, mass diffusivity parameter, Schmidt number, microorganism diffusivity parameter, bioconvection Schmidt number, magnetic body force parameter, Brownian motion and thermophoresis parameters. Extensive computations are visualized for the influence of these parameters. The present simulation is of relevance in the fabrication of bio-nanomaterials for bio-inspired fuel cells.
Nur Ardiana Amirsom; Jashim Uddin; Faisal Md Basir; Ali Kadir; O. Anwar Bég; Ahmad Izani Md. Ismail. Computation of Melting Dissipative Magnetohydrodynamic Nanofluid Bioconvection with Second-order Slip and Variable Thermophysical Properties. Applied Sciences 2019, 9, 2493 .
AMA StyleNur Ardiana Amirsom, Jashim Uddin, Faisal Md Basir, Ali Kadir, O. Anwar Bég, Ahmad Izani Md. Ismail. Computation of Melting Dissipative Magnetohydrodynamic Nanofluid Bioconvection with Second-order Slip and Variable Thermophysical Properties. Applied Sciences. 2019; 9 (12):2493.
Chicago/Turabian StyleNur Ardiana Amirsom; Jashim Uddin; Faisal Md Basir; Ali Kadir; O. Anwar Bég; Ahmad Izani Md. Ismail. 2019. "Computation of Melting Dissipative Magnetohydrodynamic Nanofluid Bioconvection with Second-order Slip and Variable Thermophysical Properties." Applied Sciences 9, no. 12: 2493.
A mathematical model is presented for laminar, steady natural convection mass transfer in boundary layer flow from a rotating porous vertical cone in anisotropic high-permeability porous media. The transformed boundary value problem is solved subject to prescribed surface and free stream boundary conditions with a Maple 17 shooting method. Validation with a Chebyshev spectral collocation method is included. The influence of tangential Darcy number, swirl Darcy number, Schmidt number, rotational parameter, momentum (velocity slip), mass slip and wall mass flux (transpiration) on the velocity and concentration distributions is evaluated in detail. The computations show that tangential and swirl velocities are enhanced generally with increasing permeability functions (i.e., Darcy parameters). Increasing spin velocity of the cone accelerates the tangential flow, whereas it retards the swirl flow. An elevation in wall suction depresses both tangential and swirl flow. However, increasing injection generates acceleration in the tangential and swirl flow. With greater momentum (hydrodynamic) slip, both tangential and swirl flows are accelerated. Concentration values and Sherwood number function values are also enhanced with momentum slip, although this is only achieved for the case of wall injection. A substantial suppression in tangential velocity is induced with higher mass (solutal) slip effect for any value of injection parameter. Concentration is also depressed at the wall (cone surface) with an increase in mass slip parameter, irrespective of whether injection or suction is present. The model is relevant to spin coating operations in filtration media (in which swirling boundary layers can be controlled with porous media to deposit thin films on industrial components), flow control of mixing devices in distillation processes and also chromatographical analysis systems.
O. Anwar Bég; Jashim Uddin; T. A. Bég; A. Kadir; Shamshuddin; Meisam Babaie. Numerical study of self-similar natural convection mass transfer from a rotating cone in anisotropic porous media with Stefan blowing and Navier slip. Indian Journal of Physics 2019, 94, 863 -877.
AMA StyleO. Anwar Bég, Jashim Uddin, T. A. Bég, A. Kadir, Shamshuddin, Meisam Babaie. Numerical study of self-similar natural convection mass transfer from a rotating cone in anisotropic porous media with Stefan blowing and Navier slip. Indian Journal of Physics. 2019; 94 (6):863-877.
Chicago/Turabian StyleO. Anwar Bég; Jashim Uddin; T. A. Bég; A. Kadir; Shamshuddin; Meisam Babaie. 2019. "Numerical study of self-similar natural convection mass transfer from a rotating cone in anisotropic porous media with Stefan blowing and Navier slip." Indian Journal of Physics 94, no. 6: 863-877.
Nur Ardiana Amirsom; Jashim Uddin; Faisal Md Basir; A.I.M. Ismail; O. Anwar Bég; Ali Kadir. Three-Dimensional Bioconvection Nanofluid Flow from a Bi-Axial Stretching Sheet with Anisotropic Slip. Sains Malaysiana 2019, 48, 1137 -1149.
AMA StyleNur Ardiana Amirsom, Jashim Uddin, Faisal Md Basir, A.I.M. Ismail, O. Anwar Bég, Ali Kadir. Three-Dimensional Bioconvection Nanofluid Flow from a Bi-Axial Stretching Sheet with Anisotropic Slip. Sains Malaysiana. 2019; 48 (5):1137-1149.
Chicago/Turabian StyleNur Ardiana Amirsom; Jashim Uddin; Faisal Md Basir; A.I.M. Ismail; O. Anwar Bég; Ali Kadir. 2019. "Three-Dimensional Bioconvection Nanofluid Flow from a Bi-Axial Stretching Sheet with Anisotropic Slip." Sains Malaysiana 48, no. 5: 1137-1149.
Nanofluid based heat transfer approaches have a tremendous prospect to develop novel cost-effective cooling technologies. In response to this potential development, a problem of unsteady copper oxide-water nanofluid flow and natural convective heat transfer within a quadrilateral vessel with uniform heating of bottom wall using modified Buongiorno model are investigated. The sloping wall of the vessel is maintained at constant low temperature and the uniform thermal condition on the bottom heated wall is considered, whereas the upper horizontal wall is regarded as adiabatic. The governing equations along with boundary conditions are solved using the Galerkin finite element method. Partial differential equation solver COMSOL Multiphysics with Matlab interface is used in the simulation. The results of the present problem of a certain situation as a special case have been verified by the previously published standard numerical investigations. The flow, thermal and concentration fields, local and average Nusselt number for various pertinent parameters entered into the problem have been analyzed. The time evolutions for a steady-state solution are also examined. The results show that the adjustment factor with the optimal nanoparticle volume fraction and the thermal Rayleigh number controls the optimal heat transfer. The trapezoidal vessel having higher sloping angles with the vertical axis exhibits higher heat transfer. Heat transfer decreases rapidly in 1–10 nm size nanoparticles for a nanofluid solution.
M.J. Uddin; S.K. Rasel. Numerical analysis of natural convective heat transport of copper oxide-water nanofluid flow inside a quadrilateral vessel. Heliyon 2019, 5, e01757 .
AMA StyleM.J. Uddin, S.K. Rasel. Numerical analysis of natural convective heat transport of copper oxide-water nanofluid flow inside a quadrilateral vessel. Heliyon. 2019; 5 (5):e01757.
Chicago/Turabian StyleM.J. Uddin; S.K. Rasel. 2019. "Numerical analysis of natural convective heat transport of copper oxide-water nanofluid flow inside a quadrilateral vessel." Heliyon 5, no. 5: e01757.