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Articles 421 - 450 of 823
Full-Text Articles in Chemical Engineering
Engineered Nanotopography On Electrospun Plla Microfibers Modifies Raw 264.7 Cell Response, Nicholas J. Schaub, Tara Britton, Rupak Rajachar, Ryan J. Gilbert
Engineered Nanotopography On Electrospun Plla Microfibers Modifies Raw 264.7 Cell Response, Nicholas J. Schaub, Tara Britton, Rupak Rajachar, Ryan J. Gilbert
Chemical and Biochemical Engineering Faculty Research & Creative Works
In this study, we created a new method of electrospinning capable of controlling the surface structure of individual fibers (fiber nano topography). The nano topographical features were created by a phase separation in the fibers as they formed. To control the phase separation, a nonsolvent (a chemical insoluble with the polymer) was added to an electrospinning solution containing poly-l-lactic acid (PLLA) and chloroform. The nano topography of electro spun fibers in the PLLA/chloroform solution was smooth. However, adding a small weight (< 2% of total solution) of a single nonsolvent (water, ethanol, or dimethyl sulfoxide) generated nanoscale depressions on the surface of the fibers unique to the nonsolvent added. Additionally, nanoscale depressions on electro spun fibers were observed to change with dimethyl sulfoxide (DMSO) concentration in the PLLA/chloroform solution. A nonlinear relationship was found between the concentration of DMSO and the number and size of nano topographical features. The surface depressions did not alter the hydrophobicity of the scaffold or degradation of the scaffold over a two-day period. To determine if fiber nano topography altered cell behavior, macrophages (RAW 264.7 cells) were cultured on fibers with a smooth nano topography or fibers with nanoscale depressions. RAW 264.7 cells spread less on fibers with nanoscale depressions than fibers with a smooth topography (p < 0.05), but there were no differences between groups with regard to cell metabolism or the number of adherent cells. The results of this study demonstrate the necessity to consider the nano topography of individual fibers as these features may affect cellular behavior. More importantly, we demonstrate a versatile method of controlling electro spun fiber nano topography. © 2013 American Chemical Society.
Encapsulation Of Supported Metal Nanoparticles With An Ultra-Thin Porous Shell For Size-Selective Reactions, Zeyu Shang, Rajankumar L. Patel, Brian W. Evanko, Xinhua Liang
Encapsulation Of Supported Metal Nanoparticles With An Ultra-Thin Porous Shell For Size-Selective Reactions, Zeyu Shang, Rajankumar L. Patel, Brian W. Evanko, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
A novel nanostructured catalyst with an ultra-thin, porous shell obtained from the thermal decomposition of an aluminum alkoxide film deposited by molecular layer deposition for size-selective reactions was developed. The molecular sieving capability of the porous metal oxide films was verified by examining the liquid-phase hydrogenation of n-hexene versus cis-cyclooctene. © 2013 The Royal Society of Chemistry.
Gas Barrier And Mechanical Properties Of Crosslinked Ethylene Vinyl Acetate Nanocomposites, S. A. Ahmad Ramazani, M. Shafiee, Hossein Abedsoltan, A. Shafiee
Gas Barrier And Mechanical Properties Of Crosslinked Ethylene Vinyl Acetate Nanocomposites, S. A. Ahmad Ramazani, M. Shafiee, Hossein Abedsoltan, A. Shafiee
Chemical and Biochemical Engineering Faculty Research & Creative Works
In this research, the effects of crosslinking agent and clay content on the morphology, barrier and mechanical properties of ethylene vinyl acetate-organoclay nanocomposites prepared by solution method were studied. Dicumyl peroxide has been used as crosslinking agent. The morphology of the prepared nanocomposites was investigated using wide-angle X-ray diffraction and transmission electron microscopy. Wide-angle X-ray diffraction and transmission electron microscopy indicated that the prepared nanocomposites had predominantly intercalated morphologies. The obtained results of permeability tests showed that the permeability of ethylene vinyl acetate films dramatically decreases with addition of organoclay and dicumyl peroxide. Mechanical tests showed that tensile modulus and …
Stabilizing Nanostructured Solid Oxide Fuel Cell Cathode With Atomic Layer Deposition, Yunhui Gong, Diego Palacio, Xueyan Song, Rajankumar L. Patel, Xinhua Liang
Stabilizing Nanostructured Solid Oxide Fuel Cell Cathode With Atomic Layer Deposition, Yunhui Gong, Diego Palacio, Xueyan Song, Rajankumar L. Patel, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
We demonstrate that the highly active but unstable nanostructured intermediate-temperature solid oxide fuel cell cathode, La0.6Sr0.4CoO3-δ (LSCo), can retain its high oxygen reduction reaction (ORR) activity with exceptional stability for 4000 h at 700 C by overcoating its surfaces with a conformal layer of nanoscale ZrO2 films through atomic layer deposition (ALD). The benefits from the presence of the nanoscale ALD-ZrO2 overcoats are remarkable: a factor of 19 and 18 reduction in polarization area-specific resistance and degradation rate over the pristine sample, respectively. The unique multifunctionality of the ALD-derived nanoscaled ZrO2 overcoats, …
Comparison Of A Sio2-Cao-Zno-Sro Glass Polyalkenoate Cement To Commercial Dental Materials: Ion Release, Biocompatibility And Antibacterial Properties, A. W. Wren, A. Coughlan, M. M. Hall, M. J. German, Mark R. Towler
Comparison Of A Sio2-Cao-Zno-Sro Glass Polyalkenoate Cement To Commercial Dental Materials: Ion Release, Biocompatibility And Antibacterial Properties, A. W. Wren, A. Coughlan, M. M. Hall, M. J. German, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Ion Release and biocompatibility of a CaO-SrO-ZnO-SiO2 (BT 101) based glass polyalkenoate cement (GPC) was compared against commercial GPCs, Fuji IX and Ketac Molar. The radiopacity (R) was similar for each material, 2.0-2.8. Ion release was evaluated on each material over 1, 7, 30 and 90 days. BT 101 release included Ca (23 mg/L), Sr (23 mg/L) Zn (13 mg/L), Si (203 mg/L). Fuji IX release includes Ca (0.7 mg/L), Al (3 mg/L) Si (26 mg/L), Na (60 mg/L) and P (0.5 mg/L) while Ketac Molar release includes Ca (1 mg/L), Al (0.6 mg/L) Si (23 mg/L), Na (76 …
Modeling The Effect Of Apc Truncation On Destruction Complex Function In Colorectal Cancer Cells, Dipak Barua, William S. Hlavacek
Modeling The Effect Of Apc Truncation On Destruction Complex Function In Colorectal Cancer Cells, Dipak Barua, William S. Hlavacek
Chemical and Biochemical Engineering Faculty Research & Creative Works
In colorectal cancer cells, APC, a tumor suppressor protein, is commonly expressed in truncated form. Truncation of APC is believed to disrupt degradation of β-catenin, which is regulated by a multiprotein complex called the destruction complex. The destruction complex comprises APC, Axin, β-catenin, serine/threonine kinases, and other proteins. The kinases CK1α and GSK-3β, which are recruited by Axin, mediate phosphorylation of β-catenin, which initiates its ubiquitination and proteosomal degradation. The mechanism of regulation of β-catenin degradation by the destruction complex and the role of truncation of APC in colorectal cancer are not entirely understood. Through formulation and analysis of a …
Automated Methods To Determine Electrospun Fiber Alignment And Diameter Using The Radon Transform, Nicholas J. Schaub, Sean J. Kirkpatrick, Ryan J. Gilbert
Automated Methods To Determine Electrospun Fiber Alignment And Diameter Using The Radon Transform, Nicholas J. Schaub, Sean J. Kirkpatrick, Ryan J. Gilbert
Chemical and Biochemical Engineering Faculty Research & Creative Works
Recent evidence demonstrates the ability to change cell function by altering the physical properties of electro spun scaffolds, but many studies still do not characterize electro spun fiber alignment and diameter. To aid in the reporting of these crucial properties, we demonstrate two methods of quantifying electro spun fiber alignment with one method capable of determining electro spun fiber diameter. The first method assesses fiber alignment in a scanning electron microscopy image using the Radon Transform (RT) to calculate the entropy of the fibers in the image. The RT entropy method was more sensitive than a commonly used Fast Fourier …
Atomic Layer Deposited Highly Dispersed Platinum Nanoparticles Supported On Non-Functionalized Multiwalled Carbon Nanotubes For The Hydrogenation Of Xylose To Xylitol, Xinhua Liang, Chengjun Jiang
Atomic Layer Deposited Highly Dispersed Platinum Nanoparticles Supported On Non-Functionalized Multiwalled Carbon Nanotubes For The Hydrogenation Of Xylose To Xylitol, Xinhua Liang, Chengjun Jiang
Chemical and Biochemical Engineering Faculty Research & Creative Works
Highly dispersed platinum nanoparticles were deposited on gram quantities of non-functionalized multiwalled carbon nanotubes (MWCNTs) by atomic layer deposition (ALD) in a fluidized bed reactor at 300°C. (Methylcyclopentadienyl) trimethylplatinum and oxygen were used as precursors. The results of TEM analysis showed that ∼1.3 nm Pt nanoparticles were highly dispersed on non-functionalized MWCNTs. The porous structures of MWCNTs did not change with the deposition of Pt nanoparticles. For comparison, the commercial 3 wt.% Pt/C catalyst was also characterized. The ALD-prepared Pt/MWCNT was used for the hydrogenation of xylose to xylitol. The ALD-prepared Pt/MWCNT showed the best catalytic performance with 100 % …
Erratum: A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation (Plos One (2013) 8 (8)), Dipak Barua, Byron Goldstein
Erratum: A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation (Plos One (2013) 8 (8)), Dipak Barua, Byron Goldstein
Chemical and Biochemical Engineering Faculty Research & Creative Works
A funding organization and grant were incorrectly omitted from the Funding Statement. The Funding Statement should read: "Research reported in this publication was supported by the National Institute of General Medical Sciences of the National Institutes of Health under award number R37-GM035556, The SpatioTemporal Modeling Center at the University of New Mexico under award number P50:GM065794 and the Department of Energy through contract DE-AC52-06NA25396. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript."
Scale-Up Of Bubble Column Reactors: A Review Of Current State-Of-The-Art, Ashfaq Shaikh, Muthanna H. Al-Dahhan
Scale-Up Of Bubble Column Reactors: A Review Of Current State-Of-The-Art, Ashfaq Shaikh, Muthanna H. Al-Dahhan
Chemical and Biochemical Engineering Faculty Research & Creative Works
In Multiphase Flow Reaction Systems, in General, an Extrapolation of Small Diameter Behavior to Larger Ones is Always an Important and Challenging Task. the Critical Issue in Such an Extrapolation Remains to Be Mixing and Hydrodynamic Characteristics. It Needs Reliable Similarity Criteria that Would Result in Similar Mixing and Hydrodynamics and Hence Transport and Performance in Two Different Scales. Numerous Experimental and Computational Studies Have Been Performed to Investigate the Flow Behavior of Bubble Column Reactors for a Proper Design and Scale-Up. Experimental Techniques Vary from Simple Visual Observation to More Advanced Noninvasive Diagnostic Techniques. on Computational Front the Progress …
Characterisation Of Ga2o3-Na2o-Cao-Zno- Sio2 Bioactive Glasses, A. W. Wren, T. Keenan, A. Coughlan, F. R. Laffir, D. Boyd, Mark R. Towler, M. M. Hall
Characterisation Of Ga2o3-Na2o-Cao-Zno- Sio2 Bioactive Glasses, A. W. Wren, T. Keenan, A. Coughlan, F. R. Laffir, D. Boyd, Mark R. Towler, M. M. Hall
Chemical and Biochemical Engineering Faculty Research & Creative Works
The structural role of Gallium (Ga) is investigated when substituted for Zinc (Zn) in a 0.42SiO2-0.40-xZnO-0.10Na2O-0.08CaO glass series, (where x = 0.08). Each starting material was amorphous, and the network connectivity (NC) was calculated assuming Ga acts as both a network modifier (1.23), and also as a network former. Assuming a network forming role for Ga the NC increased with increasing Ga concentration throughout the glass series (Control 1.23, TGa-1 2.32 and TGa-2 3.00). X-ray photoelectron spectroscopy confirmed both composition and correlated NC predictions. Raman spectroscopy was employed to investigate Q-structure and found that a shift …
Increasing Round Trip Efficiency Of Hybrid Li-Air Battery With Bifunctional Catalysts, Kan Huang, Yunfeng Li, Yangchuan Xing
Increasing Round Trip Efficiency Of Hybrid Li-Air Battery With Bifunctional Catalysts, Kan Huang, Yunfeng Li, Yangchuan Xing
Chemical and Biochemical Engineering Faculty Research & Creative Works
Previously it was shown that Pt as cathode catalyst has a large overpotential during charge in rechargeable hybrid Li-air battery with sulfuric acid catholyte. This article demonstrates that a bifunctional catalyst composed of Pt and IrO2 supported on carbon nanotubes can address this problem. The specially designed and synthesized bifunctional catalyst showed significant overpotential reduction and achieved a round-trip energy efficiency of 81% after 10 cycles, higher than many achieved in aprotic Li-O2 batteries. The hybrid Li-air battery was discharged and recharged for 20 cycles at 0.2 mA/cm2, showing a fairly stable cell performance. A specific capacity of 306 mAh/g …
Aluminium-Free Glass Polyalkenoate Cements: Ion Release And In Vitro Antibacterial Efficacy, A. W. Wren, J. P. Hansen, S. Hayakawa, Mark R. Towler
Aluminium-Free Glass Polyalkenoate Cements: Ion Release And In Vitro Antibacterial Efficacy, A. W. Wren, J. P. Hansen, S. Hayakawa, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Glass polyalkenoate cements (GPCs) have exhibited potential as bone cements. This study investigates the effect of substituting TiO2 for SiO2 in the glass phase and the subsequent effect on cement rheology, mechanical properties, ion release and antibacterial properties. Glass characterization revealed a reduction in glass transition temperature (Tg) from 685 to 669 C with the addition of 6 mol % TiO2 (AT-2). Magic angle spinning nuclear magnetic resonance (MAS-NMR) revealed a shift from -81 ppm to -76pmm when comparing a Control glass to AT-2, indicating de-polymerization of the Si network. The incorporation of TiO2 …
Method Of Purifying Crude Noscapine, Benjamin M. Marshall, Keith Tomazi
Method Of Purifying Crude Noscapine, Benjamin M. Marshall, Keith Tomazi
Chemical and Biochemical Engineering Faculty Research & Creative Works
The invention provides a method for separating noscapine from an opium source without substantially changing the color of the noscapine.
Single-Cell Measurements Of Ige-Mediated Fcεri Signaling Using An Integrated Microfluidic Platform, Yanli Liu, Dipak Barua, Peng Liu, Bridget S. Wilson, Janet M. Oliver, William S. Hlavacek, Anup K. Singh
Single-Cell Measurements Of Ige-Mediated Fcεri Signaling Using An Integrated Microfluidic Platform, Yanli Liu, Dipak Barua, Peng Liu, Bridget S. Wilson, Janet M. Oliver, William S. Hlavacek, Anup K. Singh
Chemical and Biochemical Engineering Faculty Research & Creative Works
Heterogeneity in responses of cells to a stimulus, such as a pathogen or allergen, can potentially play an important role in deciding the fate of the responding cell population and the overall systemic response. Measuring heterogeneous responses requires tools capable of interrogating individual cells. Cell signaling studies commonly do not have single-cell resolution because of the limitations of techniques used such as Westerns, ELISAs, mass spectrometry, and DNA microarrays. Microfluidics devices are increasingly being used to overcome these limitations. Here, we report on a microfluidic platform for cell signaling analysis that combines two orthogonal single-cell measurement technologies: on-chip flow cytometry …
Carbothermal Synthesis Of Titanium Oxycarbide As Electrocatalyst Support With High Oxygen Evolution Reaction Activity, Kan Huang, Yunfeng Li, Yangchuan Xing
Carbothermal Synthesis Of Titanium Oxycarbide As Electrocatalyst Support With High Oxygen Evolution Reaction Activity, Kan Huang, Yunfeng Li, Yangchuan Xing
Chemical and Biochemical Engineering Faculty Research & Creative Works
Carbothermal reduction of semiconducting TiO2 into highly conductive titanium oxycarbide (TiOxCy) was investigated. The thermally produced uniform carbon layer on TiO2 (Degussa P25) protects the TiO2 nanoparticles from sintering and, at the same time, supplies the carbon source for doping TiO2 with carbon. At low temperatures (e.g., 700 °C), carbon only substitutes part of the oxide and distorts the TiO2 lattice to form TiO2-xCx with only substitutional carbon. When the carbon-doped TiO2 is annealed at a higher temperature (1100 °C), x-ray diffraction and x-ray photoelectron spectroscopy results showed that TiOxCy, a solid …
Numerical Evaluation Of The Stability Of Stationary Points Of Index-2 Differential-Algebraic Equations: Applications To Reactive Flash And Reactive Distillation Systems, D. A. Harney, T. K. Mills, N. L. Book
Numerical Evaluation Of The Stability Of Stationary Points Of Index-2 Differential-Algebraic Equations: Applications To Reactive Flash And Reactive Distillation Systems, D. A. Harney, T. K. Mills, N. L. Book
Chemical and Biochemical Engineering Faculty Research & Creative Works
The dynamic behavior of many chemical processes can be represented by an index-2 system of differential-algebraic equations. This index can be reduced by differentiation, but unfortunately the index reduced systems are not guaranteed to possess the same stability characteristics as that of the original system. When the set of differential-algebraic equations can be written in Hessenberg form, the matrix pencil of the linearized system can be used to directly evaluate the stability of a steady state without the need for index reduction. Direct evaluations of stability of reactive flash and reactive distillation are presented. It is also shown that a …
A New Method For Online Flow Regime Monitoring In Bubble Column Reactors Via Nuclear Gauge Densitometry, Ashfaq Shaikh, Muthanna H. Al-Dahhan
A New Method For Online Flow Regime Monitoring In Bubble Column Reactors Via Nuclear Gauge Densitometry, Ashfaq Shaikh, Muthanna H. Al-Dahhan
Chemical and Biochemical Engineering Faculty Research & Creative Works
In the Current Work, Nuclear Gauge Densitometry (NGD), Which is Commercially Available and Industrially Used for Liquid/slurry Level Measurement and Control, Has Been Employed to Identify Fingerprints of the Prevailing Hydrodynamic Flow Regime. Experiments Were Performed using an Air-Water System in 0.1012. M Diameter and 1.2. M Long Bubble Column at Ambient Pressure. the Superficial Gas Velocities Were Varied from 1. Cm/s to 12. Cm/s with an Interval of 0.5. Cm/s Near Transition Region. the Flow Regime Boundaries Were Defined using the Conventional Methods of Flow Regime Demarcation Such as the Change in the Slope of the overall Gas Holdup …
Particle Shape Enhances Specificity Of Antibody-Displaying Nanoparticles, Sutapa Barua, Jin-Wook Yoo, Poornima Kolhar, Aditya Wakankar, Yatin R. Gokarn, Samir Mitragotri
Particle Shape Enhances Specificity Of Antibody-Displaying Nanoparticles, Sutapa Barua, Jin-Wook Yoo, Poornima Kolhar, Aditya Wakankar, Yatin R. Gokarn, Samir Mitragotri
Chemical and Biochemical Engineering Faculty Research & Creative Works
Monoclonal antibodies are used in numerous therapeutic and diagnostic applications; however, their efficacy is contingent on specificity and avidity. Here, we show that presentation of antibodies on the surface of nonspherical particles enhances antibody specificity as well as avidity toward their targets. Using spherical, rod-, and disk-shaped polystyrene nano- and microparticles and trastuzumab as the targeting antibody, we studied specific and nonspecific uptake in three breast cancer cell lines: BT-474, SK-BR-3, and MDA-MB-231. Rods exhibited higher specific uptake and lower nonspecific uptake in all cells compared with spheres. This surprising interplay between particle shape and antibodies originates from the unique …
Comparison Of A Sio2-Cao-Zno-Sro Glass Polyalkenoate Cement To Commercial Dental Materials: Glass Structure And Physical Properties, A. W. Wren, A. Coughlan, F. R. Laffir, Mark R. Towler
Comparison Of A Sio2-Cao-Zno-Sro Glass Polyalkenoate Cement To Commercial Dental Materials: Glass Structure And Physical Properties, A. W. Wren, A. Coughlan, F. R. Laffir, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Glass polyalkenoate cements (GPCs) have previously been considered for orthopedic applications. A Zn-GPC (BT 101) was compared to commercial GPCs (Fuji IX and Ketac Molar) which have a setting chemistry analogous to BT 101. Handling properties (working, Tw and setting, Ts times) for BT 101 were shorter than the commercial GPCs. BT 101 also had a higher setting exotherm (Sx - 34 °C) than the commercial GPCs (29 °C). The maximum strengths for BT 101, Fuji IX, and Ketac Molar were 75, 238, and 216 MPa (compressive, σc), and 34, 54, and 62 MPa (biaxial …
Hydrodynamics Of Pilot-Scale Bubble Columns: Effect Of Internals, Ahmed A. Youssef, Mohamed E. Hamed, Joshua T. Grimes, Muthanna H. Al-Dahhan, Milorad P. Duduković
Hydrodynamics Of Pilot-Scale Bubble Columns: Effect Of Internals, Ahmed A. Youssef, Mohamed E. Hamed, Joshua T. Grimes, Muthanna H. Al-Dahhan, Milorad P. Duduković
Chemical and Biochemical Engineering Faculty Research & Creative Works
The Gas Holdup and Bubble Characteristics Are Key Parameters that Affect the Performance of Bubble Columns. an Experimental Study of the Effect of Heat Exchanging Internals on the Gas Holdup, Bubble Dynamics, and their Radial Profiles is Performed. an Air-Water System is Used in a Plexiglas Column 45 Cm (18 In.) in Diameter. Internals Configurations Mimicking Those Typical for the Liquid-Phase Methanol Synthesis and Fischer-Tropsch Process and Covering 5% and 25%, Respectively, of the Total Cross-Sectional Area of the Column, Are Investigated. High Superficial Gas Velocities that Fall within the Churn Turbulent Flow Regime, Which Are of Interest for Most …
Fabrication Of Cao-Nao-Sio2/Tio2 Scaffolds For Surgical Applications, A. W. Wren, A. Coughlan, K. E. Smale, S. T. Misture, B. P. Mahon, O. M. Clarkin, Mark R. Towler
Fabrication Of Cao-Nao-Sio2/Tio2 Scaffolds For Surgical Applications, A. W. Wren, A. Coughlan, K. E. Smale, S. T. Misture, B. P. Mahon, O. M. Clarkin, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
A series of titanium (Ti) based glasses were formulated (0.62 SiO2-0.14 Na2O-0.24 CaO, with 0.05 mol% TiO2 substitutions for SiO2) to develop glass/ceramic scaffolds for bone augmentation. Glasses were initially characterised using X-ray diffraction (XRD) and particle size analysis, where the starting materials were amorphous with 4.5 μm particles. Hot stage microscopy and high temperature XRD were used to determine the sintering temperature (̃700 °C) and any crystalline phases present in this region (Na2Ca3Si6O16, combeite and quartz). Hardness testing revealed that the Ti-free control (ScC- …
Gas Adsorption In Novel Environments, Including Effects Of Pore Relaxation, W. Milton Cole, Silvina M. Gatica, Hye Young Kim, Angela D. Lueking, Sarmishtha Sircar
Gas Adsorption In Novel Environments, Including Effects Of Pore Relaxation, W. Milton Cole, Silvina M. Gatica, Hye Young Kim, Angela D. Lueking, Sarmishtha Sircar
Chemical and Biochemical Engineering Faculty Research & Creative Works
Adsorption experiments have been interpreted frequently with simplified model geometries, such as ideally flat surfaces and slit or cylindrical pores. Recent explorations of unusual environments, such as fullerenes and metal-organic-framework materials, have led to a broadened scope of experimental, theoretical and simulation investigations. This paper reviews a number of such studies undertaken by our group. Among the topics receiving emphasis are these: universality of gas uptake in pores, relaxation of a porous absorbent due to gas uptake and the novel phases of gases on a single nanotube, all of which studies have been motivated by recent experiments.
A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation, Dipak Barua, Byron Goldstein
A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation, Dipak Barua, Byron Goldstein
Chemical and Biochemical Engineering Faculty Research & Creative Works
We present a model of the early events in mast cell signaling mediated by FcεRI where the plasma membrane is composed of many small ordered lipid domains (rafts), surrounded by a non-order region of lipids consisting of the remaining plasma membrane. The model treats the rafts as transient structures that constantly form and breakup, but that maintain a fixed average number per cell. The rafts have a high propensity for harboring Lyn kinase, aggregated, but not unaggregated receptors, and the linker for the activation of T cells (LAT). Phosphatase activity in the rafts is substantially reduced compared to the nonraft …
A Hybrid Li-Air Battery With Buckypaper Air Cathode And Sulfuric Acid Electrolyte, Yunfeng Li, Kan Huang, Yangchuan Xing
A Hybrid Li-Air Battery With Buckypaper Air Cathode And Sulfuric Acid Electrolyte, Yunfeng Li, Kan Huang, Yangchuan Xing
Chemical and Biochemical Engineering Faculty Research & Creative Works
We demonstrate a type of carbon nanotube based buckypaper cathode in a hybrid electrolyte Li-air battery (HyLAB) that showed outstanding discharging performances. the HyLAB has sulfuric acid as the catholyte and a large active electrode area (10 cm 2). the active cathode layer was made from a buckypaper with 5 wt.% Pt supported on carbon nanotubes (Pt/CNTs) for oxygen reduction and evolution. a similar cathode was constructed with a catalyst of 5 wt.% Pt supported on carbon black (Pt/CB). It is demonstrated that sulfuric acid can achieve high discharging current densities while maintaining relatively high cell potentials. the cell with …
Fabrication Of Ph- Or Temperature-Responsive Single Wall Carbon Nanotubes Via A Graft From Photopolymerization, Pu Zhang, David B. Henthorn
Fabrication Of Ph- Or Temperature-Responsive Single Wall Carbon Nanotubes Via A Graft From Photopolymerization, Pu Zhang, David B. Henthorn
Chemical and Biochemical Engineering Faculty Research & Creative Works
An ultraviolet light initiated "graft from" polymerization method to fabricate polymer-functionalized single wall carbon nanotubes (SWNTs) with pendant pH- and temperature-responsive polymer chains is utilized. the attached polymer chains, formed from methacrylic acid and poly (ethylene glycol) methyl ether methacrylate monomers, are well established for its pH-responsive swelling/deswelling behavior. This special property was utilized here to control the aqueous dispersibility of the carbon nanotubes. Furthermore, poly(N-isopropylacrylamide), a temperature-responsive polymer, was utilized in the fabrication of SWNTs whose dispersibility was dependent on solution temperature. the morphology of the polymer-functionalized carbon nanotubes was characterized by scanning electron microscopy (SEM) before and after …
Increasing Pt Oxygen Reduction Reaction Activity And Durability With A Carbon-Doped Tio 2 Nanocoating Catalyst Support, Kan Huang, Kotaro Sasaki, Radoslav R. Adzic, Yangchuan Xing
Increasing Pt Oxygen Reduction Reaction Activity And Durability With A Carbon-Doped Tio 2 Nanocoating Catalyst Support, Kan Huang, Kotaro Sasaki, Radoslav R. Adzic, Yangchuan Xing
Chemical and Biochemical Engineering Faculty Research & Creative Works
We report a conductive TiO2 nanocoating on carbon nanotubes (CNTs) as a Pt electrocatalyst support that shows a significant enhancement in Pt catalyst activity and durability for the oxygen reduction reaction. by using CNTs as the substrate for TiO2 nanocoating, the nanoscale morphology of the oxide was retained during heat treatment. after carbon doping of the TiO2 nanocoating, X-ray photoelectron spectroscopy suggests a shift in the binding energy of Ti 2p, implying a suboxide formation. the X-ray absorption near-edge structure showed the mid-edge and post-edge up to 5010 eV, which are attributed to a 1s → 4p transition and promotion …
Design And Characterization Of Asymmetric Cross-Linked Polymer Membranes By Molecular Dynamics Modeling And Simulations, Jee-Ching Wang, Athanasios I. Liapis
Design And Characterization Of Asymmetric Cross-Linked Polymer Membranes By Molecular Dynamics Modeling And Simulations, Jee-Ching Wang, Athanasios I. Liapis
Chemical and Biochemical Engineering Faculty Research & Creative Works
No abstract provided.
Developing Novel Prognostic Biomarkers For Multivariate Fracture Risk Prediction Algorithms, Ernest K. Poku, Mark R. Towler, Niamh M. Cummins, Jeff D. Newman
Developing Novel Prognostic Biomarkers For Multivariate Fracture Risk Prediction Algorithms, Ernest K. Poku, Mark R. Towler, Niamh M. Cummins, Jeff D. Newman
Chemical and Biochemical Engineering Faculty Research & Creative Works
Multivariate prediction algorithms such as FRAX® and QFracture Scores provide an opportunity for new prognostic biomarkers to be developed and incorporated, potentially leading to better fracture prediction. As more research is conducted into these novel biomarkers, a number of factors need to be considered for their successful development for inclusion in these algorithms. In this review, we describe two well-known multivariate prediction algorithms for osteoporosis fracture risk applicable to the UK population, FRAX and QFracture Scores, and comment on the current prognostic tools available for fracture risk; dual X-ray assessment, quantitative ultrasonography, and genomic/biochemical markers. We also highlight the factors …
Stochastic Simulation Of Entangled Polymeric Liquids In Fast Flows: Microstructure Modification, Joontaek Park, David W. Mead, Morton M. Denn
Stochastic Simulation Of Entangled Polymeric Liquids In Fast Flows: Microstructure Modification, Joontaek Park, David W. Mead, Morton M. Denn
Chemical and Biochemical Engineering Faculty Research & Creative Works
We have modified the full-chain stochastic tube (XDS) model developed by Xu et al. [J. Rheol. 50, 477-494 (2006)] to simulate the rheology of entangled melts and solutions of linear monodisperse polymers. The XDS model, which has a single adjustable parameter that is equivalent to the Rouse time, successfully describes steady and transient shear and normal stress data at low to moderate rates, but the results deviate systematically from experimental data at high rates. The algorithm for re-entanglement was revised, and a configuration- dependent friction coefficient (CDFC), as originally proposed by Giesekus, was incorporated to account for microstructural change of …