A5101640805- Catalysts for Methane Reforming
- Photonic and Optical Devices
- Optical Network Technologies
- Catalysis for Biomass Conversion
- Catalysis and Hydrodesulfurization Studies
- Advanced Physical and Chemical Molecular Interactions
- Analytical Chemistry and Chromatography
- Biofuel production and bioconversion
- Block Copolymer Self-Assembly
- Enzyme Production and Characterization
- Semiconductor Lasers and Optical Devices
- Catalytic Processes in Materials Science
- Biodiesel Production and Applications
- Photochemistry and Electron Transfer Studies
- Lubricants and Their Additives
- Advanced Nanomaterials in Catalysis
- Chemical and Physical Properties of Materials
- Polymer Nanocomposites and Properties
- Nanomaterials for catalytic reactions
- Advanced Combustion Engine Technologies
- Plant-Microbe Interactions and Immunity
- Advanced Polymer Synthesis and Characterization
- Electrostatics and Colloid Interactions
- Microbial Metabolites in Food Biotechnology
- Silicon Nanostructures and Photoluminescence
University of Waterloo
2019-2024
Nirma University
2017-2023
Jain University
2021
Hemchandracharya North Gujarat University
2015-2021
Uka Tarsadia University
2017
Navsari Agricultural University
2016
Alcatel Lucent (Germany)
2007
Voith (United States)
2006
Osaka University
1989
University of Minnesota
1986-1988
We report the formation of a three-dimensionally ordered array air bubbles monodisperse pore size in polymer film through templating mechanism based on thermocapillary convection. Dilute solutions simple, coil-like volatile solvent are cast glass slide presence moist flowing across surface. Evaporative cooling and generation an breath figures leads to multilayers hexagonally packed water droplets that preserved final, solid as spherical bubbles. The dimensions these can be controlled simply...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTForces between surfaces of block copolymers adsorbed on micaGeorges. Hadziioannou, Sanjay. Patel, Steve. Granick, and Matthew. TirrellCite this: J. Am. Chem. Soc. 1986, 108, 11, 2869–2876Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 1986https://pubs.acs.org/doi/10.1021/ja00271a014https://doi.org/10.1021/ja00271a014research-articleACS PublicationsRequest reuse permissionsArticle...
Block copolymers are macromolecular amphiphiles and as such have a wide variety of interesting interfacial behavior. We present here case block copolymer adsorption from solution studied by the direct measurement forces between two adsorbed layers. The is polystyrene (PS)-poly(2-vinylpyridine) (PVP) on mica toluene. Under these circumstances layer firmly anchored PS cilia (or loops in PVP-PS-PVP tri-blocks) assembled surface. Furthermore, adopt an extended chain configuration due to lateral...
The direct relationship existing between the average rate constant 〈k〉 for pyrene excimer formation and local concentration [Py]loc of ground-state pyrenyl labels covalently attached to a macromolecule was established 55 pyrene-labeled macromolecules (PyLM). These PyLM belonged three different families with first representing short monodisperse linear chains end-labeled (polystyrene, poly(ethylene oxide), poly(N-isopropyl acrylamide)), second long polydisperse randomly labeled (poly(methyl...
The interactions between the surfactants sodium dodecyl sulfate (SDS) and dioctyl sulfosuccinate (AOT) starch nanoparticles (SNPs) hydrophobically modified with hydrophobic dye pyrene (Py-SNPs) were investigated in water by steady-state time-resolved fluorescence. Py-SNPs formed interparticulate aggregates water, which disrupted adding SDS to Py-SNP aqueous dispersions. was found interact at concentrations that close 2 orders of magnitude lower than its critical micelle concentration (CMC)....
The authors demonstrate an integrated add-drop filter with true reconfigurability. It can drop any combination of eight wavelengths to ports, less than 7 dB loss. Its features are suitable for mass production: use standard silica waveguide technology, double-rejection switching and filtering all paths, compactness, power-efficient thermooptic switching.
The average rate constant (⟨
Pyrene excimer formation (PEF) was applied to study the homopolypeptides poly(d,l-glutamic acid) (PDLGA) and poly(l-glutamic (PLGA), collectively referred as PGA samples, in N,N-dimethylformamide (DMF) dimethyl sulfoxide (DMSO). The polypeptides were labeled with 1-pyrenebutylamine (PyC4N) or 1-pyreneoctylamine (PyC8N) described PyCX(x)N-PGA where X equals 4 8, respectively, x represents mole percentage of pyrene-labeled glutamic acid (Glu). fluorescence results obtained these compared...
We report here the first direct measurement of intermolecular forces between a polymer layer and solid surface. When surfaces bearing adsorbed approach one another, interactions develop that may be categorized as polymer–polymer polymer–solid (and negligible contribution solid–solid at large separations imposed by polymer). Direct measurements layers on mica have been made recently with apparatus type developed Israelachvili. Attractive are attributed to combination osmotic (polymer–polymer)...
We demonstrate a fully CMOS processed Ge p-i-n photodetector integrated with Si waveguide on SOI platform high responsivity of 1.0 A/W at lambda=1520 nm, and 3 dB bandwidth >4.5 GHz measured lambda=1550 nm
Starch nanoparticles (SNPs) were hydrophobically modified by using 1-pyrenebutyric acid (PyBA) with degrees of substitution (DS) between 0.0006 and 0.11. Fluorescence quenching studies conducted on the pyrene-labeled starch (Py-SNPs) in dimethyl sulfoxide (DMSO) water nitromethane (NM), 4-mononitrotoluene (MNT), 2,6-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT) to assess mode pyrene labels two solvents. In DMSO where pyrene, starch, quenchers soluble, a decrease fluorescence signal was...
Abstract The thermal expansion properties of three commercial elastomers; Pebax®, Estane® and Hytrel® modified with 2.5–10 wt % boron nitride were investigated. glass transition temperatures the filled materials relatively unaffected; however did effectively reinforce all elastomers as seen by dynamic mechanical analysis tensile tests. coefficients composite do not obey rule mixtures show a large decrease without loss ductility typically associated elastomers. © 2006 Wiley Periodicals, Inc....
We present selectively grown Ge p-i-n photodetectors coupled to high index contrast Si(core)/SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (cladding) waveguides on a silicon-on-insulator (SOI) platform. Two coupling schemes, namely butt-coupling and vertical coupling, were demonstrated in this study. With the scheme we have achieved responsivity of 1.0 A/W at 1520 nm 3 dB bandwidth greater than 4.5 GHz 1550 nm. scheme, where light...
Abstract The impact of ZrO 2 as a catalytic promoter for nickel-based alumina supported catalysts has been studied the hydrogen synthesis via glycerol steam reforming. Hydrogen is promising contender clean fuel and key significance in quest an environment-preservation, low emission more sustainable energy approach. Glycerol by-product produced during production biodiesel by trans-esterification vegetable oils. higher content makes it potential renewable feedstock production. Steam reforming...
Wide-tunable-range optical delay lines are demonstrated in high index contrast waveguides. This device integrates tunable allpass filters, for continuous tuning, with cascaded fixed waveguides enabling coherent switching and tuning ranges up to 2.56ns.
We demonstrate waveguide-integrated Ge p-i-n photodetectors on Si with vertical coupling and butt-coupling schemes. A responsivity of >1.0 A/W around 1550 nm a bandwidth several GHz were achieved in both cases.
In current study, process has been developed for hydrogen production from bio-butanol via steam reforming (SR) proton exchange membrane fuel cell (PEMFC) application. Heat integration with pinch analysis method was carried out to reduce overall heating and cooling utility requirement of energy intensive SR process. Despite highly endothermic nature SR, found be self-sustained in terms utility. integrated green process, which can explored its capacity.Â
Pectinases are the various hydrolytic and depolymerizing enzymes that breakdown pectin fibre. They have diverse application in field of food industry, pharmaceutical industry waste management. produced from almost all organisms including microbes, plant animals. fungal bacterial origin is considerably more important for commercial production. Isolation polygalacturonase producing species carried out soil which dumped with fruits vegetables. The production by different isolates optimized...