A5017006521- Chalcogenide Semiconductor Thin Films
- Polymer crystallization and properties
- Rheology and Fluid Dynamics Studies
- Surface and Thin Film Phenomena
- Polymer Foaming and Composites
- Polymer Nanocomposites and Properties
- nanoparticles nucleation surface interactions
- Phase Equilibria and Thermodynamics
- Analytical Chemistry and Sensors
- Mesoporous Materials and Catalysis
- Quantum Dots Synthesis And Properties
- solar cell performance optimization
- Bee Products Chemical Analysis
- Hydrogels: synthesis, properties, applications
- 3D Printing in Biomedical Research
- Aerogels and thermal insulation
- Thermodynamic properties of mixtures
- Learning Styles and Cognitive Differences
- Experimental Learning in Engineering
- Microfluidic and Bio-sensing Technologies
- Microplastics and Plastic Pollution
- Copper Interconnects and Reliability
- Graphene research and applications
- Educational Games and Gamification
- Flame retardant materials and properties
University of Massachusetts Lowell
2015-2025
Foster-Miller (United States)
2004
University of Delaware
1996-2002
National Renewable Energy Laboratory
2002
United States Department of Energy
2002
Middle East Technical University
1982-1999
McGill University
1984-1985
In order to use either a linear or nonlinear model of viscoelasticity calculate the stress response material various deformations, it is usually necessary have available an explicit equation for relaxation modulus G(t). The most popular procedure data from small‐amplitude oscillatory shear experiment determine parameters generalized Maxwell model. However, this ill‐posed problem and not at all straightforward curve‐fitting operation. We compare three procedures determining set times discrete...
Abstract A recently proposed mixing rule has been combined with a cubic equation of state to correlate the vapor‐liquid equilibria various polymer + solvent and long chain hydrocarbon mixtures. We find that two‐parameter version this model can partial pressure in concentrated solutions high accuracy over range temperatures pressures temperature‐independent parameters. For systems, for which accurate vapor‐phase concentrations are also important, is best used as three‐parameter correlation....
Abstract An experimental study was made of the effects die geometry and extrusion velocity on parison swell for three high‐density‐polyethylene blowmolding resins. Four annular dies were used: a straight, diverging, two converging dies. Diameter thickness swells measured as functions time under isothermal conditions in absence drawdown. This accomplished by extruding into an oil having same density temperature extrudate. It observed that 60 to 80 percent occurs first few seconds equilibrium...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Ian McDougall, Nese Orbey, John M. Dealy; Inferring meaningful relaxation spectra from experimental data. J. Rheol. 1 May 2014; 58 (3): 779–797. https://doi.org/10.1122/1.4870967 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search...
Polyaniline (PANI) is one of the most studied conducting polymers owing to its high electrical conductivity, straightforward synthesis and stability. Graphene-supported PANI nanocomposite materials combine superior physical properties graphene, synergistically enhancing performance as well giving rise new properties. Covalent nanocomposites have shown give higher stability better than their non-covalent counterparts, however, covalent graphene-PANI are primarily prepared from graphene oxide....
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Scott Ankiewicz, Nese Orbey, Hiroshi Watanabe, Helen Lentzakis, John Dealy; On the use of continuous relaxation spectra to characterize model polymers. J. Rheol. 1 November 2016; 60 (6): 1115–1120. https://doi.org/10.1122/1.4960334 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley...
Abstract The effects of nucleating agent, temperature crystallization, and degree machine direction (MD) orientation on the mechanical, optical, thermal properties biaxially oriented polypropylene (BOPP) films were investigated. Addition agent improved only initial tear resistance in MD; however, other mechanical optical did not change appreciably. In set experiments which crystallization was increased, crystallinity also increased. Thus, Young's modulus, yield stress, tensile strength...
Hydrogen peroxide (H2O2) entrapment in silica hydrogels has potential to be used various industrially important applications increase H2O2 stability. In this study, optimum conditions for hydrogel formation and stability were determined by varying the sodium content initial concentration. Higher retention better of achieved with at room temperature low Retention values 89% obtained concentrations up 10 wt %. decomposition followed a first-order reaction. Hydrogels characterized measuring...
Foams are used in a variety of impact energy absorption applications because their ability to engage large deformations under steady load transfer during the cell collapse. Quantification capabilities foams, including those resulting from repeated loading and unloading, is critical both modeling prototype development systems utilizing these important materials. This paper details novel process characterizing cross-linked high-density polyethylene foam for its applicability within helmet...
ABSTRACT Poly(lactic acid) (PLA) nanocomposites containing five types of organically modified, layered silicates and two elastomeric compatibilizers, namely ethylene‐glycidyl methacrylate (E‐GMA) ethylene‐butyl acrylate‐maleic anhydride (E‐BA‐MAH), were prepared using a twin screw extruder. The morphologies the determined by X‐ray diffraction (XRD) transmission electron microscopy (TEM), rheological properties melts measured small‐amplitude oscillatory shear. XRD revealed that addition E‐GMA...
Microencapsulation is used as a means to retain the activity of silicotungstic acid (STA), an industrially important catalyst, during repeated use in ethyl acetate synthesis reaction. Standard sol–gel microencapsulation procedures were modified microencapsulate STA inside silica shell. The microcapsules characterized determine their morphology, presence and amount active material, pore structure. catalyst was tested esterification reaction between acetic ethanol. multiple times after being...
Acrylonitrile butadiene styrene (ABS) nanocomposites containing Cloisite 11 organoclay at 2 wt% were prepared using a 60 L/D ultra‐ high speed twin screw extruder (TSE), with speeds ranging from 400 to 4000 rpm. The purpose of this study was investigate the effect shear melt processing on intercalation and exfoliation in polymer, as well mechanical rheological properties material. X‐ray Diffraction (XRD), Transmission Electron Microscopy (TEM) results showed better nanofiller increasing up...
Hydrogen peroxide (H 2 O ) is encapsulated in silica hydrogels using sol‐gel method and the effects of K + : Na ion ratio on gelation time, hydrogel structure, stability, release rate H were investigated. As amount ions increased relative to at same pH, gel structure became less compact pore diameter increased. retention values up 90 80% observed end 7 20 days, respectively, presence low pH when initial concentration was 19.9 wt %. Release hydrogen decreased with decreasing for two ratios...
Hydrogen peroxide (H2O2) was entrapped in silica hydrogels using the sol–gel approach, and its transition to xerogel studied by monitoring H2O2 retention as a function of weight loss at ambient temperature. The took place different drying regimes, maximum concentration obtained 80% initial hydrogel. stability higher 33.2 wt % found be comparable values with having lower concentrations (10–20 %). release rate from gel concentration, sodium content gel, pH aqueous medium, form...
This paper addresses the ability to reduce process costs for multisource evaporation of Cu(InGa)Se/sub 2/ by reducing deposition temperature and film thickness increasing rate. Substrate (T/sub ss/) is varied from 600/spl ges/T/sub ss//spl ges/350/spl deg/C using fixed elemental fluxes. The grain size decreases over entire range but Na incorporation soda lime glass substrate does not change. Solar cell efficiency slowly 550/spl ges/400/spl deg/C. At T/sub ss/ below 400/spl there a change in...
Abstract A simple, lumped‐parameter model has been developed to predict the length and shape of a parison on basis experimental swell data storage modulus resin. The applicability limitations are demonstrated by comparing its predictions with observations behavior.
Hydrogen peroxide (H2O2) disinfection applications are limited by its rapid inactivation. The aims of this study were to (i) micro‐encapsulate H2O2 in silica hydrogels obtain controlled release up 72 h, (ii) test hydrogel antimicrobial activity against four common pathogens and (iii) assess kinetics 35–65% relative humidity 37°C approximate bandaged wound conditions. Hydrogels characterized using scanning electron microscopy, nitrogen sorption porosimetry, Brunauer Emmet Teller analysis the...