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Articles 1 - 30 of 62
Full-Text Articles in Engineering
Piezoresistive Properties Of Ito Strain Sensors Prepared With Controlled Nanoporosity, Otto J. Gregory, Tao You
Piezoresistive Properties Of Ito Strain Sensors Prepared With Controlled Nanoporosity, Otto J. Gregory, Tao You
Chemical Engineering Faculty Publications
A ceramic strain gage based on reactively sputtered indium-tinoxide (ITO) thin films is being developed to monitor the structural integrity of components employed in aerospace propulsion systems operating at temperatures in excess of 1500°C. The hightemperature stability and piezoresistive properties depend to a large extent on the thickness of the active ITO strain elements comprising these ceramic strain gages. Scanning electron microscopy of the thick ITO sensors revealed a partially sintered microstructure consisting of a contiguous network of submicrometer ITO particles with well-defined necks and isolated nanoporosity. It appeared that densification of the ITO particles was retarded during high-temperature exposure …
On The Generalized Borel Transform And Its Application To The Statistical Mechanics Of Macromolecules, Marcelo Marucho, Gustavo A. Carri
On The Generalized Borel Transform And Its Application To The Statistical Mechanics Of Macromolecules, Marcelo Marucho, Gustavo A. Carri
College of Polymer Science and Polymer Engineering
We present a new integral transform called the generalized Borel transform (GBT) and show how to use it to compute distribution functions used to describe the statistical mechanics of macromolecules. For this purpose, we choose the random flight model (RFM) of macromolecules and show that the application of the GBT to this model leads to the exact expression of the polymer propagator (two-point correlation function) from which all the statistical properties of the model can be obtained. We also discuss the mathematical simplicity of the GBT and its applicability to macromolecules with other topologies. (C) 2003 American Institute of Physics.
Method For Forming An Antenna And A Radio Frequency Transponder, Ravi F. Saraf
Method For Forming An Antenna And A Radio Frequency Transponder, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A method is disclosed for forming an antenna and a radio frequency transponder. The method comprises the steps of (1) forming a paste comprising metal powder, polymeric material, and solvent; and (2) screening the paste through a screen onto a substrate. Additional steps couple electrical components to the paste and dry the paste.
Apparatus And Method For Dispersing Nano-Elements To Assemble Device, Craig A. Grimes, Elizabeth Dickey
Apparatus And Method For Dispersing Nano-Elements To Assemble Device, Craig A. Grimes, Elizabeth Dickey
Chemical and Materials Engineering Faculty Patents
An apparatus for dispersing a first plurality of conductive elongated nano-elements distributed within a carrier-fluid to assemble a conductive device made of a first charge-receptive area of a support surface to which at least one nano-element has attached, including: a nozzle through which the elongated nano-elements are directed such that the nano-elements pass through an electromagnetic field for imparting a preselected charge thereto, and toward at least the first charge-receptive area. The charge-receptive area is given a charge such that it attracts a first end-portion of one of the nano-elements. Also, a method of assembling a conductive device. Steps include: …
Self Assembled Nano-Devices Using Dna, Ravi F. Saraf
Self Assembled Nano-Devices Using Dna, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
An article of manufacture including an organic structure and inorganic atoms bonded to specific locations on the organic structure.
Yieldlike Constitutive Transition In Shear Flow Of Entangled Polymeric Fluids, Prashant Tapadia, Shi-Qing Wang
Yieldlike Constitutive Transition In Shear Flow Of Entangled Polymeric Fluids, Prashant Tapadia, Shi-Qing Wang
College of Polymer Science and Polymer Engineering
We describe an unexpected constitutive transition in entangled polymer solutions. At and beyond a critical stress, the initial spatially homogeneous and well-entangled sample transforms from its entangled (coiled) state into a fully disentangled (stretched) state over a period during which the resulting shear rate increases in a spatially inhomogeneous fashion. In the mode of controlled shear rate, the sample exhibits a stress plateau over three decades. Flow birefringence and normal stress observations unravel additional features of these flow phenomena.
A Macrokinetic Study Of The High-Temperature Solid-Phase Titanium-Carbon Reaction, Julia Y. Kostagorva, Hendrik J. Viljoen, Alexander S. Shteinberg
A Macrokinetic Study Of The High-Temperature Solid-Phase Titanium-Carbon Reaction, Julia Y. Kostagorva, Hendrik J. Viljoen, Alexander S. Shteinberg
Papers in Reaction Kinetics
An experimental method, electro thermal explosion (ETE), is used to measure the macro kinetic parameters of the high-temperature titanium/carbon reaction. Different stages of the reaction have been identified, but the focus of this study is on the reaction between solid titanium and solid carbon, i.e., prior to the melting of titanium. The reaction has high activation energy, and an electric current is used to heat the cylindrically shaped sample to a specified temperature. The current is shut off at a temperature below the melting point of titanium; any further temperature rise is only due to reaction. The output of the …
Kinetics Of Wet Air Oxidation Of Phenol Over A Novel Catalyst, Jing Guo, Muthanna H. Al-Dahhan
Kinetics Of Wet Air Oxidation Of Phenol Over A Novel Catalyst, Jing Guo, Muthanna H. Al-Dahhan
Chemical and Biochemical Engineering Faculty Research & Creative Works
The Wet Air Oxidation Kinetics of an Aqueous Solution of Phenol Was Studied over Extrudates of an Al-Fe Pillared Clay Catalyst in the Temperature Range of 90-150°C and Air Pressure Range of 0.8-2.5 MPa. the Variables Studied Included Reaction Temperature, Air Pressure, Solution PH, Initial Phenol Concentration, and Catalyst Loading. the Obtained Findings Are Compared with Those Obtained using Hydrogen Peroxide Oxidation. a Group of Kinetic Models Considering Both the Power-Law and Langmuir-Hinshelwood Approaches Was Evaluated to Describe the Catalytic Kinetics of the Phenol Disappearance. the Nonlinear Dependence of the Phenol Conversion Rate on the Catalyst Concentration Was Taken into …
Temperature, Stress, And Corrosive Sensing Apparatus Utilizing Harmonic Response Of Magnetically Soft Sensor Element (S), Craig A. Grimes, Keat Ghee Ong
Temperature, Stress, And Corrosive Sensing Apparatus Utilizing Harmonic Response Of Magnetically Soft Sensor Element (S), Craig A. Grimes, Keat Ghee Ong
Chemical and Materials Engineering Faculty Patents
A temperature sensing apparatus including a sensor element made of a magnetically soft material operatively arranged within a first and second time-varying interrogation magnetic field, the first time-varying magnetic field being generated at a frequency higher than that for the second magnetic field. A receiver, remote from the sensor element, is engaged to measure intensity of electromagnetic emissions from the sensor element to identify a relative maximum amplitude value for each of a plurality of higher-order harmonic frequency amplitudes so measured. A unit then determines a value for temperature (or other parameter of interst) using the relative maximum harmonic amplitude …
Deterministic Solutions For A Step-Growth Polymerization, Sungjae Choi, Xiangdong Liu, Delmar C. Timm
Deterministic Solutions For A Step-Growth Polymerization, Sungjae Choi, Xiangdong Liu, Delmar C. Timm
Papers in Molecular Chemistry
Chain topology, including branch node, chain link and cross-link dynamics that contribute to the number of elastically active strands and junctions, are calculated using purely deterministic derivations. Solutions are not coupled to population density distributions. An eigenzeit transformation assists in the conversion of expressions derived by chemical reaction principles from time to conversion space, yielding transport phenomena type expressions where the rate of change in the molar concentrations of branch nodes with respect to conversion is expressed as functions of the fraction of reactive sites on precursors and reactants. Analogies are hypothesized to exist in cross-linking space that effectively distribute …
Computation Of Effectiveness Factors For Partially Wetted Catalyst Pellets Using The Method Of Fundamental Solution, E. Palmisano, P. A. Ramachandran, K. Balakrishnan, M. (Muthanna) H. Al-Dahhan
Computation Of Effectiveness Factors For Partially Wetted Catalyst Pellets Using The Method Of Fundamental Solution, E. Palmisano, P. A. Ramachandran, K. Balakrishnan, M. (Muthanna) H. Al-Dahhan
Chemical and Biochemical Engineering Faculty Research & Creative Works
Trickle Bed Reactors Are Widely Used in Many Process Industries. the Catalyst Particles Are Often Incompletely Wetted Especially in the Trickling Flow Regime and Hence to Design These Reactors, the Effectiveness Factor of Partially Wetted Catalyst Needs to Be Calculated Accurately. Numerical Solutions by Traditional Methods Are Time Consuming and Not Very Accurate, Especially for Some Commonly Used Complex Catalyst Shapes Such as Trilobes, Quadrilobes Etc. the Paper Presents a Novel Numerical Solution for These Problems based on the Method of Fundamental Solutions. the Advantage of the Method is that It Involves Only Boundary Collocation and Can Be Applied to …
Preliminary Work On The Antibacterial Effect Of Strontium In Glass Ionomer Cements, A. Guida, Mark R. Towler, J. G. Wall, R. G. Hill, S. Eramo
Preliminary Work On The Antibacterial Effect Of Strontium In Glass Ionomer Cements, A. Guida, Mark R. Towler, J. G. Wall, R. G. Hill, S. Eramo
Chemical and Biochemical Engineering Faculty Research & Creative Works
The antibacterial effect of strontium in glass ionomer cements (GIC) was discussed. The glass transition temperatures were found to decrease with the increasing fluorine content consistent with the fluorine replacing bridging oxygens. However no significant correlation was found between the fluoride release and the antibacterial activity.
Synthesis Of Chemical Tags, Ravi F. Saraf
Synthesis Of Chemical Tags, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A method for forming a biological chemical tag. At least one double stranded DNA molecule is provided. At least a portion of the at least one double stranded DNA molecule is denatured. At least one chemical moiety that prohibits recrystallization of the at least one denatured portion to which the at least one chemical moiety is attached is attached to at least one nucleotide in the at least one denatured portion of the at least one double stranded DNA molecule.
A Mushy-Zone Rayleigh Number To Describe Interdendritic Convection During Directional Solidification Of Hypoeutectic Pb-Sb And Pb-Sn Alloys, Surendra N. Tewari, R. Tiwari
A Mushy-Zone Rayleigh Number To Describe Interdendritic Convection During Directional Solidification Of Hypoeutectic Pb-Sb And Pb-Sn Alloys, Surendra N. Tewari, R. Tiwari
Chemical & Biomedical Engineering Faculty Publications
Based on measurements of the specific dendrite surface area (S-nu), fraction of interdendritic liquid (phi), and primary dendrite spacing (lambda(1)) on transverse sections in a range of directionally solidified hypoeutectic Pb-Sb and Pb-Sn alloys that were grown at thermal gradients varying from 10 to 197 K cm(-1) and growth speeds ranging from 2 to 157 mum s(-1), it is observed that S-nu = lambda(1)(-1) S*(-0.33) (3.38 - 3.29 phi + 8.85 phi(2)), where S* = D-l G(eff)/V m(1) C-o (k - 1)/k, with D-l being the solutal diffusivity in the melt, G(eff) being the effective thermal gradient, V being the …
Progress In The Development Of A Recombinant Vaccine For Human Hookworm Disease: The Human Hookworm Vaccine Initiative, Peter J. Hotez, Bin Zhan, Jeffrey M. Bethony, Alex Loukas, Angela Williamson, Gaddam Narsa Goud, John M. Hawdon, Azra Dobardzic, Reshad Dobardzic, Kashinath Ghosh, Maria Elena Bottazzi, Susana Mendez, Bernard Zook, Yan Wang, Sen Liu, Idong Essiet-Gibson, Sophia Chung-Debose, Shuhua Xiao, David Knox, Michael Meagher, Mehmet Inan, Rodrigo Correa-Oliviera, Paul Vilk, Herman R. Shepherd, Walter Brandt, Philip K. Russell
Progress In The Development Of A Recombinant Vaccine For Human Hookworm Disease: The Human Hookworm Vaccine Initiative, Peter J. Hotez, Bin Zhan, Jeffrey M. Bethony, Alex Loukas, Angela Williamson, Gaddam Narsa Goud, John M. Hawdon, Azra Dobardzic, Reshad Dobardzic, Kashinath Ghosh, Maria Elena Bottazzi, Susana Mendez, Bernard Zook, Yan Wang, Sen Liu, Idong Essiet-Gibson, Sophia Chung-Debose, Shuhua Xiao, David Knox, Michael Meagher, Mehmet Inan, Rodrigo Correa-Oliviera, Paul Vilk, Herman R. Shepherd, Walter Brandt, Philip K. Russell
Michael Meagher Publications
Hookworm infection is one of the most important parasitic infections of humans, possibly outranked only by malaria as a cause of misery and suffering. An estimated 1.2 billion people are infected with hookworm in areas of rural poverty in the tropics and subtropics. Epidemiological data collected in China, Southeast Asia, and Brazil indicate that, unlike other soil-transmitted helminth infections, the highest hookworm burdens typically occur in adult populations, including the elderly. Emerging data on the host cellular immune responses of chronically infected populations suggest that hookworms induce a state of host anergy and immune hyporesponsiveness. These features account for the …
Directional Solidification And Convection In Small Diameter Crucibles, Jun Chen, P. K. Sung, D. R. Poirier, H. C. De Groh Iii
Directional Solidification And Convection In Small Diameter Crucibles, Jun Chen, P. K. Sung, D. R. Poirier, H. C. De Groh Iii
Chemical & Biomedical Engineering Faculty Publications
Pb–2.2 wt.% Sb alloy was directionally solidified in 1, 2, 3 and 7 mm diameter crucibles. Pb–Sb alloy presents a solutally unstable case. Under plane–front conditions, the resulting macrosegregation along the solidified length indicates that convection persists even in the 1 mm diameter crucible. Al–2 wt.% Cu alloy was directionally solidified because this alloy was expected to be stable with respect to convection. Nevertheless, the resulting macrosegregation pattern and the microstructure in solidified examples indicated the presence of convection. Simulations performed for both alloys show that convection persists for crucibles as small as 0.6 mm of diameter …
Plasticized, Antiplasticized And Crystalline Conducting Polymers And Precursors Thereof, Ravi F. Saraf
Plasticized, Antiplasticized And Crystalline Conducting Polymers And Precursors Thereof, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
Materials containing precursors to electrically conductive polymers and electrically conductive polymers are described which have a high degree of crystallinity. The high degree of crystallinity is achieved by preparing the materials under conditions which provide a high degree of mobility to the polymer molecules permitting them to associate with one another to form a crystalline state. High levels of electrical conductivity are achieved in the electrically conductive materials without stretch orienting the material. The enhanced electrical conductivity is isotropic as compared to a stretch oriental film which has isotropic electrical conductivity.
Characterization And Optimization Of A Chromatographic Process Based On Ethylenediamine-N,N,N′,N′-Tetra(Methylphosphonic) Acid-Modified Zirconia Particles, Sabyasachi Sarkar, Peter W. Carr, Clayton V. Mcneff, Anuradha Subramanian
Characterization And Optimization Of A Chromatographic Process Based On Ethylenediamine-N,N,N′,N′-Tetra(Methylphosphonic) Acid-Modified Zirconia Particles, Sabyasachi Sarkar, Peter W. Carr, Clayton V. Mcneff, Anuradha Subramanian
Papers in Biotechnology
The primary objective of work was to characterize, optimize and model a chromatographic process based on ethylenediamine-N,N,N′,N′-tetra(methylphosphonic) acid (EDTPA)-modified zirconia particles. Zirconia particles were produced by spray-drying colloidal zirconia. Zirconia spheres produced were further classified, calcined and modified with EDTPA to yield a solid-phase support for use in bio-chromatography (r_PEZ). Specifically, the ability of r_PEZ to selectively bind and enrich IgG, IgA, and IgM from biological fluids was evaluated and demonstrated. To better understand the force of interaction between the IgG and the r_PEZ, the equilibrium disassociation constant (Kd) was determined by static binding isotherms, as a function of temperature …
In Situ Uv-Visible Assessment Of Extent Of Reduction During Oxidation Reactions On Oxide Catalysts, Morris D. Argyle, Kaidong Chen, Carlo Resini, Catherine Krebs, Alexis T. Bell, Enrique Iglesia
In Situ Uv-Visible Assessment Of Extent Of Reduction During Oxidation Reactions On Oxide Catalysts, Morris D. Argyle, Kaidong Chen, Carlo Resini, Catherine Krebs, Alexis T. Bell, Enrique Iglesia
Faculty Publications
The extent of reduction of active centers during oxidative alkane dehydrogenation on VOx/Al2O3 was measured from pre-edge UV-visible spectral features and found to increase with increasing VOx domain size and propane/O2 ratio.
Catalytic Wet Oxidation Of Phenol By Hydrogen Peroxide Over Pillared Clay Catalyst, Jing Guo, Muthanna H. Al-Dahhan
Catalytic Wet Oxidation Of Phenol By Hydrogen Peroxide Over Pillared Clay Catalyst, Jing Guo, Muthanna H. Al-Dahhan
Chemical and Biochemical Engineering Faculty Research & Creative Works
Extrudates of Al-Fe Pillared Clay Catalyst Suitable for Packed-Bed Operations Are Evaluated for Wastewater Treatment Via a Wet Oxidation Process Employing Hydrogen Peroxide as the Oxidant. the Reaction Was Carried Out in a Semibatch Basket Reactor under Rather Mild Conditions. Operational Parameters Were Studied under the Following Conditions: Temperature from 25 to 90 °C, Atmospheric Pressure, Initial Phenol Concentration from 100 to 2000 Ppm of the Liquid Phase, Catalyst Loading from 0 to 10 G/L, and Input H2O2 Concentration from 0.15 to 0.6 Mol/L. under These Conditions, the Al-Fe Pillared Clay Catalyst Achieves a Total Elimination of Phenol and Significant …
Effects Of Solvent Model Flexibility On Aqueous Electrolyte Behavior Between Electrodes, Richard L. Rowley, John N. Harb, Clint G. Guymon, Matthew L. Hunsaker, Douglas Henderson
Effects Of Solvent Model Flexibility On Aqueous Electrolyte Behavior Between Electrodes, Richard L. Rowley, John N. Harb, Clint G. Guymon, Matthew L. Hunsaker, Douglas Henderson
Faculty Publications
Molecular dynamics simulations have been carried out for aqueous electrolyte solutions between model electrode surfaces. The effect of solvent model flexibility on bult and double layer properties was observed for electrode surface charge densities of 0, 0.1 and 0.2 and ion concentrations of 0, 0.5 and 1 M. Two flexible models were used to isolate the effects of flexibility from the effects of a change in the condensed-phase dipole moment. Model flexibility increases the pure water self-diffusion coefficient while a larger liquid diple moment substantially decreases it. There is an increase in ion contact adsorption and counter ion affinity with …
Environmental Sustainability Education At The University Of Michigan: Collaboration With Industry To Provide Experiential Learning Opportunities, Angela D. Lueking, Deborah A. Ross, Walter Weber Jr
Environmental Sustainability Education At The University Of Michigan: Collaboration With Industry To Provide Experiential Learning Opportunities, Angela D. Lueking, Deborah A. Ross, Walter Weber Jr
Chemical and Biochemical Engineering Faculty Research & Creative Works
The Concentrations in Environmental Sustainability (ConsEnSus) Program at the University of Michigan is a new multi-disciplinary opportunity for graduate students in the College of Engineering to pursue interests in environmental sustainability white obtaining a traditional engineering Master's degree. Students from several engineering departments complement traditional disciplinary course requirements with courses in environmental regulations, policies, and technology. A required case studies course of the ConsEnSus Program brings practicing engineers together with students to discuss real-world sustainability problems. The industrial participants interactively present relevant case studies, and provide opportunities for experiential learning through classroom activities and term projects. This paper …
Observation Of Novel Liquid-Crystalline Phase Above The Bulk-Melting Temperature, Keshav S. Gautam, Satyendra Kumar, Didier Wermeille, Doug Robinson, Ali Dhinojwala
Observation Of Novel Liquid-Crystalline Phase Above The Bulk-Melting Temperature, Keshav S. Gautam, Satyendra Kumar, Didier Wermeille, Doug Robinson, Ali Dhinojwala
College of Polymer Science and Polymer Engineering
In this paper, we show that a noncrystalline but ordered smectic-like phase exists above the bulk-melting temperature (T-m) at poly(n-alkyl acrylates)-air interface. The surface ordered phase is one monolayer thick and undergoes a sharp transition from order to disorder 10degreesC above T-m for n=22. The presence of a surface phase that does not exist in the bulk has important implications in the design of thermally responsive adhesives.
Modeling Of The Fischer-Tropsch Synthesis In Slurry Bubble Column Reactors, Novica Rados, Muthanna H. Al-Dahhan, Milorad P. Dudukovic
Modeling Of The Fischer-Tropsch Synthesis In Slurry Bubble Column Reactors, Novica Rados, Muthanna H. Al-Dahhan, Milorad P. Dudukovic
Chemical and Biochemical Engineering Faculty Research & Creative Works
A Multicomponent One-Dimensional Dynamic Mathematical Model for the Reacting Slurry Systems with a Change in Gas Flow Rate Due to the Chemical Reaction is Developed. a Change in Gas Flow Rate Caused by the Chemical Reaction is Modeled using the overall Gas Mass Balance. Thus, All Relevant Chemical Species Are Included in the Model. Linear First-Order Reaction Kinetics is Considered. the Gas Phase is Modeled using the Two-Bubble Class Hydrodynamic Model. the Interaction between Small and Large Bubbles is Included as the Cross-Flow. Suspension of Liquid and Solids is Assumed to Form a Pseudo Slurry Phase. Back-Mixing in All of …
Use Of Combinatorial Genetic Libraries To Humanize N-Linked Glycosylation In The Yeast Pichia Pastoris, Byung-Kwon Choi, Piotr Bobrowicz, Robert C. Davidson, Stephen R. Hamilton, David Kung, Huijuan Li, Robert Miele, Juergen Nett, Stefan Wildt, Tillman Gerngross
Use Of Combinatorial Genetic Libraries To Humanize N-Linked Glycosylation In The Yeast Pichia Pastoris, Byung-Kwon Choi, Piotr Bobrowicz, Robert C. Davidson, Stephen R. Hamilton, David Kung, Huijuan Li, Robert Miele, Juergen Nett, Stefan Wildt, Tillman Gerngross
Dartmouth Scholarship
The secretory pathway of Pichia pastoris was genetically re-engineered to perform sequential glycosylation reactions that mimic early processing of N-glycans in humans and other higher mammals. After eliminating nonhuman glycosylation by deleting the initiating alpha-1,6-mannosyltransferase gene from P. pastoris, several combinatorial genetic libraries were constructed to localize active alpha-1,2-mannosidase and human beta-1,2-N-acetylglucosaminyltransferase I (GnTI) in the secretory pathway. First, >32 N-terminal leader sequences of fungal type II membrane proteins were cloned to generate a leader library. Two additional libraries encoding catalytic domains of alpha-1,2-mannosidases and GnTI from mammals, insects, amphibians, worms, and fungi were cloned to generate catalytic domain libraries. …
Micro Goniometer For Scanning Probe Microscopy, Ravi F. Saraf
Micro Goniometer For Scanning Probe Microscopy, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A goniometer for performing scanning probe microscopy on a substrate surface is disclosed. The goniometer has a cantilever, having a cantilevered end and a supported end and a tip disposed at the cantilevered end of the cantilever. The goniometer also has a block disposed at the supported end of the cantilever. The block has at least one pair of piezoelectric layers, a pair of electrodes disposed about each individual piezoelectric layer such that varying a potential difference applied between the individual electrodes of a pair of electrodes causes the corresponding piezoelectric layer to deform, and a first insulating material disposed …
Ferroelectric Storage Read-Write Memory, Ravi F. Saraf
Ferroelectric Storage Read-Write Memory, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A memory device including at least one pair of spaced apart conductors and a ferroelectric material between the pair of conductors. The pair of conductors is spaced apart a distance sufficient to permit a tunneling current there between.
Preparing And Regenerating A Composite Polymer And Silica-Based Membrane, Dibakar Bhattacharyya, Stephen M. Ritchie, Leonidas G. Bachas, Jamie A. Hestekin, Subhas K. Sikdar
Preparing And Regenerating A Composite Polymer And Silica-Based Membrane, Dibakar Bhattacharyya, Stephen M. Ritchie, Leonidas G. Bachas, Jamie A. Hestekin, Subhas K. Sikdar
Chemical and Materials Engineering Faculty Patents
A method for preparing and regenerating a chemically activated or polyamino acid functionalized membrane includes the steps of permeating the silica-based membrane with a solution of silane and a solvent so as to react methoxy groups of the silane with silanol groups of the membrane to incorporate epoxide groups and attaching a polyamino acid to the membrane by reacting a terminal amine group of the polyamino acid with one of the epoxide groups on the membrane. The membrane is regenerated after metal entrapment by utilizing helix-coil properties of polyamino acids.
Method Of Preparing A Composite Polymer And Silica-Based Membrane, Dibakar Bhattacharyya, Stephen M. Ritchie, Leonidas G. Bachas, Jamie A. Hestekin, Subhas K. Sikdar
Method Of Preparing A Composite Polymer And Silica-Based Membrane, Dibakar Bhattacharyya, Stephen M. Ritchie, Leonidas G. Bachas, Jamie A. Hestekin, Subhas K. Sikdar
Chemical and Materials Engineering Faculty Patents
A method for preparing a chemically activated or polyamino acid functionalized membrane includes the steps of permeating a silica-based membrane with a solution of silane and a solvent so as to react methoxy groups of the silane with silanol groups of the membrane to incorporate epoxide groups and attaching a polyamino acid to the membrane by reacting a terminal amine group of the polyamino acid with one of the epoxide groups on the membrane.
Investigation Into The Ultrasound Setting Of Glass Ionomer Cements. Part I. Postulated Modalities, Mark R. Towler, C. M. Crowley, R. G. Hill
Investigation Into The Ultrasound Setting Of Glass Ionomer Cements. Part I. Postulated Modalities, Mark R. Towler, C. M. Crowley, R. G. Hill
Chemical and Biochemical Engineering Faculty Research & Creative Works
Fuji IX glass is a low phosphate, low soda containing glass which has strontia incorporated as a radio-pacifier. This glass material was analyzed during exposure to different durations of ultrasound in an attempt to determine how the glass phase reacts. Cross sections of Fuji IX cement, set both conventionally and by ultrasound, were subsequently compared by microscopy. The resultant data were analyzed in detail.