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Articles 1 - 28 of 28
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Macro-/Micro-Controlled 3d Lithium-Ion Batteries Via Additive Manufacturing And Electric Field Processing, Jie Li, Xinhua Liang, Frank W. Liou, Jonghyun Park
Macro-/Micro-Controlled 3d Lithium-Ion Batteries Via Additive Manufacturing And Electric Field Processing, Jie Li, Xinhua Liang, Frank W. Liou, Jonghyun Park
Chemical and Biochemical Engineering Faculty Research & Creative Works
This paper presents a new concept for making battery electrodes that can simultaneously control macro-/micro-structures and help address current energy storage technology gaps and future energy storage requirements. Modern batteries are fabricated in the form of laminated structures that are composed of randomly mixed constituent materials. This randomness in conventional methods can provide a possibility of developing new breakthrough processing techniques to build well-organized structures that can improve battery performance. In the proposed processing, an electric field (EF) controls the microstructures of manganese-based electrodes, while additive manufacturing controls macro-3D structures and the integration of both scales. The synergistic control of …
Superelastic And Ph-Responsive Degradable Dendrimer Cryogels Prepared By Cryo-Aza-Michael Addition Reaction, Juan Wang, Hu Yang
Superelastic And Ph-Responsive Degradable Dendrimer Cryogels Prepared By Cryo-Aza-Michael Addition Reaction, Juan Wang, Hu Yang
Chemical and Biochemical Engineering Faculty Research & Creative Works
Dendrimers exhibit super atomistic features by virtue of their well-defined discrete quantized nanoscale structures. Here, we show that hyperbranched amine-terminated polyamidoamine (PAMAM) dendrimer G4.0 reacts with linear polyethylene glycol (PEG) diacrylate (575 g/mol) via the aza-Michael addition reaction at a subzero temperature (-20 °C), namely cryo-aza-Michael addition, to form a macroporous superelastic network, i.e., dendrimer cryogel. Dendrimer cryogels exhibit biologically relevant Young's modulus, high compression elasticity and super resilience at ambient temperature. Furthermore, the dendrimer cryogels exhibit excellent rebound performance and do not show significant stress relaxation under cyclic deformation over a wide temperature range (-80 to 100 °C). The …
Highly Porous Ceramic Material And Method Of Using And Forming The Same, Alan W. Weimer, Xinhua Liang
Highly Porous Ceramic Material And Method Of Using And Forming The Same, Alan W. Weimer, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
The present invention generally relates to porous ceramic material and to methods of making and using the material. More particularly, the invention relates to methods of forming ceramic materials by depositing material, using atomic layer deposition, onto a sacrificial substrate and to ceramic materials having controlled wall thickness, relatively large pores, and high surface area by weight.
Apparatus, Methods And Systems For Fabricating Thin Nanoporous Membranes, Sankar Nair, Jeffrey H. Drese, Kiwon Eum, Ryan P. Lively, Ali A. Rownaghi, Yash Tamhankar, Shaowei Yang
Apparatus, Methods And Systems For Fabricating Thin Nanoporous Membranes, Sankar Nair, Jeffrey H. Drese, Kiwon Eum, Ryan P. Lively, Ali A. Rownaghi, Yash Tamhankar, Shaowei Yang
Chemical and Biochemical Engineering Faculty Research & Creative Works
Embodiments of the present disclosure provide apparatuses, methods and systems for scalable fabrication of thin, nanoporous membranes useful in industrial applications. One embodiment of the present disclosure provides a molecular separation device configured to efficiently separate molecular species. In this particular embodiment, porous hollow fibers form a supporting scaffold for synthesis of a molecular organic framework (MOF) membrane. The MOF membrane may be synthesized on the inner or outer porous hollow fiber surface as well as within the porous fiber wall. Embodiments of the present disclosure provide a variety of methods for producing the aforementioned molecular separation devices as well …
Experimental Investigation On Heat Transfer In A Prismatic Modular Reactor Under Cosine Heat Flux, S. M. Alshehri, I. A. Said, Muthanna H. Al-Dahhan, Shoaib Usman
Experimental Investigation On Heat Transfer In A Prismatic Modular Reactor Under Cosine Heat Flux, S. M. Alshehri, I. A. Said, Muthanna H. Al-Dahhan, Shoaib Usman
Chemical and Biochemical Engineering Faculty Research & Creative Works
The current study has investigated natural convection heat during pressurized conduction cooldown (PCC) accident scenario to understand the passive safety features of prismatic modular reactors (PMR) under different intensities of nonuniform center peaking step heat flux distributions (approximating cosine shape) using an advanced fast-response heat transfer technique. A scaled-down PMR module was designed and developed at Missouri S&T by the research team of the Multiphase Reactors Engineering and Applications Laboratory (mReal). The module consists of upper and lower plena connected by heated and cooled channels. Nonuniform heat flux distribution was applied to the heated channel under nonuniform heating center peaking …
Ultra-Thin Coating And Three-Dimensional Electrode Structures To Boosted Thick Electrode Lithium-Ion Battery Performance, Jie Li, Yan Gao, Xinhua Liang, Jonghyun Park
Ultra-Thin Coating And Three-Dimensional Electrode Structures To Boosted Thick Electrode Lithium-Ion Battery Performance, Jie Li, Yan Gao, Xinhua Liang, Jonghyun Park
Chemical and Biochemical Engineering Faculty Research & Creative Works
This paper reports a multiscale controlled three‐dimensional (3D) electrode structure to boost the battery performance for thick electrode batteries with LiMn1.5Ni0.5O4 as cathode material, which exhibits a high areal capacity (3.5 mAh/cm2) along with a high specific capacity (130 mAh/g). This excellent battery performance is achieved by a new concept of cell electrode fabrication, which simultaneously controls the electrode structure in a multiscale manner to address the key challenges of the material. Particles with ultrathin conformal coating layers are prepared through atomic layer deposition followed by a nanoscale‐controlled, thermal diffusion doping. The particles …
A Spatio-Temporal Model Reveals Self-Limiting Fcɛri Cross-Linking By Multivalent Antigens, Md Shahinuzzaman, Jawahar Khetan, Dipak Barua
A Spatio-Temporal Model Reveals Self-Limiting Fcɛri Cross-Linking By Multivalent Antigens, Md Shahinuzzaman, Jawahar Khetan, Dipak Barua
Chemical and Biochemical Engineering Faculty Research & Creative Works
Aggregation of cell surface receptor proteins by multivalent antigens is an essential early step for immune cell signalling. A number of experimental and modelling studies in the past have investigated multivalent ligand-mediated aggregation of IgE receptors (FcɛRI) in the plasma membrane of mast cells. However, understanding of the mechanisms of FcɛRI aggregation remains incomplete. Experimental reports indicate that FcɛRI forms relatively small and finite-sized clusters when stimulated by a multivalent ligand. By contrast, modelling studies have shown that receptor cross-linking by a trivalent ligand may lead to the formation of large receptor superaggregates that …
Effect Of Differences In The Primary Structure Of The A-Chain On The Aggregation Of Insulin Fragments, Paul P. Nakka, Ke Li, Daniel Forciniti
Effect Of Differences In The Primary Structure Of The A-Chain On The Aggregation Of Insulin Fragments, Paul P. Nakka, Ke Li, Daniel Forciniti
Chemical and Biochemical Engineering Faculty Research & Creative Works
Bovine and human insulin have similar primary structures. In this article, the region of the insulin A-chain of bovine and human insulin where the amino acid composition is different was studied. Bovine insulin fragment (BIF) and human insulin fragment (HIF) were synthesized in solid-phase peptide synthesis. The effects of pH, temperature, urea, ionic strength, and stirring on the formation of fibrils were studied using a fractional factorial resolution III experimental design. Fibrillation was monitored by fluorescence and infrared spectroscopy and optical microscopy. Both fragments formed fibrils at pH 1.6 and a temperature of 60 °C. The lag time and apparent …
Incorporating Germanium Oxide Into The Glass Phase Of Novel Zinc/Magnesium-Based Gpcs Designed For Bone Void Filling: Evaluating Their Physical And Mechanical Properties, Basel A. Khader, Omar Rodriguez, Mark R. Towler
Incorporating Germanium Oxide Into The Glass Phase Of Novel Zinc/Magnesium-Based Gpcs Designed For Bone Void Filling: Evaluating Their Physical And Mechanical Properties, Basel A. Khader, Omar Rodriguez, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
The structural role of Germanium (Ge), when substituting for Zinc (Zn) up to 8 mol % in the 0.48SiO2-0.12CaO-0.36ZnO-0.04MgO glass series, was investigated with respect to both the glass chemistry and also the properties of glass polyalkenoate cements (GPCs) manufactured from them. The Network connectivity (NC) of the glass was calculated to increase from 1.83 to 2.42 with the addition of GeO2 (0-8 mol %). Differential thermal analysis (DTA) results confirmed an increase in the glass transition temperature (Tg) of the glass series with GeO2 content. X-ray photoelectron spectroscopy (XPS) showed an increase in …
Significant Improvement In Tio₂ Photocatalytic Activity Through Controllable Zro₂ Deposition, Xiaofeng Wang, Rajankumar L. Patel, Xinhua Liang
Significant Improvement In Tio₂ Photocatalytic Activity Through Controllable Zro₂ Deposition, Xiaofeng Wang, Rajankumar L. Patel, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
ZrO2 was deposited on anatase TiO2 nanoparticles using 5-80 cycles of atomic layer deposition (ALD). The photocatalytic activity of all samples was evaluated based on the degradation of methylene blue (MB) solution under UV light. The TiO2 sample with 45 cycles of ZrO2 deposition (45c-Zr/TiO2, 1.1 wt% ZrO2) was proved to be the most efficient catalyst with a degradation kinetic constant 10 times larger than that of the pure TiO2 sample. All samples were characterized using inductively coupled plasma atomic emission spectroscopy (ICP-AES), nitrogen adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy …
Microwave-Assisted Synthesis Of Palladium Nanoparticles Supported On Copper Oxide In Aqueous Medium As An Efficient Catalyst For Suzuki Cross-Coupling Reaction, Hany A. Elazab, M. A. Sadek, Tamer T. El-Idreesy
Microwave-Assisted Synthesis Of Palladium Nanoparticles Supported On Copper Oxide In Aqueous Medium As An Efficient Catalyst For Suzuki Cross-Coupling Reaction, Hany A. Elazab, M. A. Sadek, Tamer T. El-Idreesy
Chemical and Biochemical Engineering Faculty Research & Creative Works
We report here a reliable green method for the synthesis of palladium nanoparticles supported on copper oxide as a highly active and efficient catalyst for Suzuki cross-coupling reaction. The experimental synthetic approach is based on microwave-assisted chemical reduction of an aqueous mixture of palladium and copper salt simultaneously using hydrazine hydrate as reducing agent. The catalyst was fully characterized using various techniques showing well-dispersed palladium nanoparticles. The catalytic activity and recyclability of the prepared catalyst were experimentally explored in the ligand-free Suzuki cross-coupling reaction with a diverse series of functionalized substrates. The synthesized Pd/CuO catalyst shows many advantages beside its …
Software For Peak Finding And Elemental Composition Assignment For Glycosaminoglycan Tandem Mass Spectra, John D. Hogan, Joshua A. Klein, Jiandong Wu, Pradeep Chopra, Geert Jan Boons, Luis Carvalho, Cheng Lin, Joseph Zaia
Software For Peak Finding And Elemental Composition Assignment For Glycosaminoglycan Tandem Mass Spectra, John D. Hogan, Joshua A. Klein, Jiandong Wu, Pradeep Chopra, Geert Jan Boons, Luis Carvalho, Cheng Lin, Joseph Zaia
Chemical and Biochemical Engineering Faculty Research & Creative Works
Glycosaminoglycans (GAGs) Covalently Linked to Proteoglycans (PGs) Are Characterized by Repeating Disaccharide Units and Variable Sulfation Patterns Along the Chain. GAG Length and Sulfation Patterns Impact Disease Etiology, Cellular Signaling, and Structural Support for Cells. We and Others Have Demonstrated the Usefulness of Tandem Mass Spectrometry (MS 2 ) for Assigning the Structures of GAG Saccharides; However, Manual Interpretation of Tandem Mass Spectra is Time-Consuming, So Computational Methods Must Be Employed. in the Proteomics Domain, the Identification of Monoisotopic Peaks and Charge States Relies on Algorithms that Use Averagine, or the Average Building Block of the Compound Class Being Analyzed. …
The Catalytic Activity Of Copper Oxide Nanoparticles Towards Carbon Monoxide Oxidation Catalysis: Microwave – Assisted Synthesis Approach, Hany A. Elazab
The Catalytic Activity Of Copper Oxide Nanoparticles Towards Carbon Monoxide Oxidation Catalysis: Microwave – Assisted Synthesis Approach, Hany A. Elazab
Chemical and Biochemical Engineering Faculty Research & Creative Works
In this research, we report a simple, versatile, and reproducible method for the synthesis of copper oxide nanoparticles via microwave assisted synthesis approach. The important advantage of this catalyst is due to its important role not only in the low temperature oxidation of CO but also in potential applications in pharmaceutical and fine chemical synthesis. The results reveal that the copper oxide catalyst has particularly a remarkable high activity for CO oxidation catalysis as it was found that copper oxide (CuO) catalyst has 100% conversion of carbon monoxide into carbon dioxide at 175 oC. This also could be attributed to …
Laser Vaporization And Controlled Condensation (Lvcc) Of Graphene Supported Pd/Fe3o4 Nanoparticles As An Efficient Magnetic Catalysts For Suzuki Cross – Coupling, Hany A. Elazab
Chemical and Biochemical Engineering Faculty Research & Creative Works
Herein, a reproducible, reliable, and efficient method was reported for the synthesis of palladium nanoparticles dispersed on a composite of Fe3O4 and graphene (Pd-Fe3O4/G) as a highly efficient active catalyst for being used in Suzuki cross–coupling reactions. Graphene supported Pd/Fe3O4 nanoparticles (Pd-Fe3O4/G) exhibit a remarkable catalytic performance towards Suzuki coupling reactions. Moreover, the prepared catalyst could be recycled for up to three times with high catalytic activity. The catalyst was prepared using LVCC synthesis; the prepared catalyst is highly magnetic which provides a platform to facilitate …
High Efficiency, High Performance Metal-Organic Framework (Mof) Membranes In Hollow Fibers And Tubular Modules, Sankar Nair, Kiwon Eum, Christopher W. Jones, Ali A. Rownaghi
High Efficiency, High Performance Metal-Organic Framework (Mof) Membranes In Hollow Fibers And Tubular Modules, Sankar Nair, Kiwon Eum, Christopher W. Jones, Ali A. Rownaghi
Chemical and Biochemical Engineering Faculty Research & Creative Works
A reactor cell for measuring gas and liquid permeation is disclosed. A hollow fiber is supported by and sealed into a first hole and a second hole of the reactor module. The first and second ends of the hollow fiber are sealed with a sealing solution. Methods for making and using the reactor cell are also disclosed. As made and used, the reactor cell further comprises a molecular sieving membrane that is uniform and free of defects grown on an inner bore surface of the hollow fiber.
Negative Electron Transfer Dissociation Sequencing Of 3-O-Sulfation-Containing Heparan Sulfate Oligosaccharides, Jiandong Wu, Juan Wei, John D. Hogan, Pradeep Chopra, Apoorva Joshi, Weigang Lu, Joshua Klein, Geert Jan Boons, Cheng Lin, Joseph Zaia
Negative Electron Transfer Dissociation Sequencing Of 3-O-Sulfation-Containing Heparan Sulfate Oligosaccharides, Jiandong Wu, Juan Wei, John D. Hogan, Pradeep Chopra, Apoorva Joshi, Weigang Lu, Joshua Klein, Geert Jan Boons, Cheng Lin, Joseph Zaia
Chemical and Biochemical Engineering Faculty Research & Creative Works
Among Dissociation Methods, Negative Electron Transfer Dissociation (NETD) Has Been Proven the Most Useful for Glycosaminoglycan (GAG) Sequencing Because It Produces Informative Fragmentation, a Low Degree of Sulfate Losses, High Sensitivity, and Translatability to Multiple Instrument Types. the Challenge, However, is to Distinguish Positional Sulfation. in Particular, NETD Has Been Reported to Fail to Differentiate 4-O- Versus 6-O-Sulfation in Chondroitin Sulfate Decasaccharide. This Raised the Concern of Whether NETD is Able to Differentiate the Rare 3-O-Sulfation from Predominant 6-O-Sulfation in Heparan Sulfate (HS) Oligosaccharides. Here, We Report that NETD Generates Highly Informative Spectra that Differentiate Sites of O-Sulfation on Glucosamine …
Biodegradation Of Phenolic Components In Wastewater By Micro Algae: A Review, Muthanna H. Al-Dahhan, Faris Hammoodi Al-Ani, Adaf Jadaan Obaied Al-Saned
Biodegradation Of Phenolic Components In Wastewater By Micro Algae: A Review, Muthanna H. Al-Dahhan, Faris Hammoodi Al-Ani, Adaf Jadaan Obaied Al-Saned
Chemical and Biochemical Engineering Faculty Research & Creative Works
The biodegradation of phenolic contaminant present in wastewater by micro algae has been investigated in the current research. The study focused on algae growth requirements and factors affecting algae growth in contaminated water leading to the best treatment. Different techniques used to functionalize microalgae in the treatment such as batch and continuous operation modes have been further investigated. Mechanisms for microalgae pollutants degradation and microalgae growth kinetics were also highlighted to present the required knowledge in phenol contaminant biodegradation field by microorganisms.
Development Of A Novel Bioactive Glass Suitable For Osteosarcoma-Related Bone Grafts, Alireza Rahimnejad Yazdi, Lawrence Torkan, Stephen D. Waldman, Mark R. Towler
Development Of A Novel Bioactive Glass Suitable For Osteosarcoma-Related Bone Grafts, Alireza Rahimnejad Yazdi, Lawrence Torkan, Stephen D. Waldman, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
In this study, zinc borate-based glasses with increasing gallium content (0, 2.5, 5, 10, and 15 wt % Ga) were synthesized and their effect on the viability and proliferation of preosteoblasts and osteosarcoma cancer cells were investigated. Methyl thiazolyl tetrazolium (MTT) cell viability assays using glass degradation extracts revealed that the extracts from glasses with lower Ga contents could enhance the viability of preosteoblasts, while extracts from the glass composition with 15 wt % Ga caused statistically significant reduction of their viability. MTT cell viability assays using the extracts and osteosarcoma cells showed that only extracts from the glass composition …
Systems And Methods For Endotoxin Removal From Fluids, Sutapa Barua
Systems And Methods For Endotoxin Removal From Fluids, Sutapa Barua
Chemical and Biochemical Engineering Faculty Research & Creative Works
Systems and methods are provided for the removal of endotoxins from fluids. The methods can include the use of polymeric nanoparticles for binding endotoxins present in a fluid. The polymeric nanoparticles can be associated with a support member. The polymeric nanoparticles can have an endotoxin removal capacity of at least 1×109 endotoxin units per gram of polymeric nanoparticle (EU/g) and/or a removal efficacy per unit surface area of the polymeric nanoparticles of at least 1×106 EU/cm2.
The Effect Of Weak Confinement On The Orientation Of Nanorods Under Shear Flows, Saman Monjezi, James D. Jones, Alyssa K. Nelson, Joontaek Park
The Effect Of Weak Confinement On The Orientation Of Nanorods Under Shear Flows, Saman Monjezi, James D. Jones, Alyssa K. Nelson, Joontaek Park
Chemical and Biochemical Engineering Faculty Research & Creative Works
We performed a numerical analysis to study the orientation distribution of a dilute suspension of thin, rigid, rod-like nanoparticles under shearing flow near a solid boundary of weak confinement. Brownian dynamics simulation of a rod was performed under various ratios of shear rate and rod diffusivity (Peclet number), as well as the center-of-mass position (wall confinement). We discuss the effects of Peclet number and wall confinement on the angle distributions, Jeffery orbit distribution and average orientation moments. The average orientation moments, obtained as a function of Peclet number and wall confinement, can be used to improve a previous shear-induced migration …
System, Devices And Methods For Molecular Separation, Sankar Nair, Christopher W. Jones, Fereshteh Rashidi, Ali A. Rownaghi
System, Devices And Methods For Molecular Separation, Sankar Nair, Christopher W. Jones, Fereshteh Rashidi, Ali A. Rownaghi
Chemical and Biochemical Engineering Faculty Research & Creative Works
Systems, devices and methods for molecular separation including a molecular separation device comprising at least a polycrystalline metal-organic framework (MOF) and a nanocrystalline, zeolite MFI, wherein the MOF forms a polycrystalline membrane with zeolite MFI nanoparticles dispersed therein, and the MOF membrane matrix contacting and surrounding the zeolite MFI nanoparticles form a permselective nanoporous structure.
The Effect Of Mg²⁺ Incorporation Into The Glass Phase Of Zinc-Based Glass Polyalkenoate Cements, Basel A. Khader, Omar Rodriguez, Mark R. Towler
The Effect Of Mg²⁺ Incorporation Into The Glass Phase Of Zinc-Based Glass Polyalkenoate Cements, Basel A. Khader, Omar Rodriguez, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
The suitability of glass polyalkenoate cements (GPCs) as injectable adhesives in orthopedics have been compromised by the presence of aluminum (Al), a component in the glass phase of all commercial GPCs. There has been considerable work on the development of Al-free GPCs which can be formulated based on calcium (Ca) zinc (Zn) silicate (Si) glasses. These materials, in terms of biocompatibility and mechanical properties, have potential for orthopedics. However, many of these experimental Al-free GPCs have setting times shorter than 60 s, restricting clinical applications. Here, the authors incorporate Magnesium (Mg) into the glass phase of Al-free GPCs in an …
Injectable Glass Polyalkenoate Cements: Evaluation Of Their Rheological And Mechanical Properties With And Without The Incorporation Of Lidocaine Hydrochloride, P. Niranjan, A. Alhalawani, S. Phull, I. Beniluz, B. Krishnan, P. Zalzal, Mark R. Towler
Injectable Glass Polyalkenoate Cements: Evaluation Of Their Rheological And Mechanical Properties With And Without The Incorporation Of Lidocaine Hydrochloride, P. Niranjan, A. Alhalawani, S. Phull, I. Beniluz, B. Krishnan, P. Zalzal, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Lidocaine hydrochloride is used as an anesthetic in many clinical applications. This short communication investigates the effect of complete substitution of lidocaine hydrochloride for deionized (DI) water on the physico-chemical properties of two novel glass polyalkenoate cements. Substituting DI water with lidocaine hydrochloride resulted in cements with shorter working times but comparable setting times and mechanical properties. Fourier transform infrared spectroscopy confirmed that the setting reaction in cements containing DI water and lidocaine hydrochloride was completed within 24 h, post cement preparation and maturation. Further, it was explained that lidocaine hydrochloride binds to poly(acrylic) acid (PAA) due to electrostatic forces …
Raman Spectroscopy Predicts The Link Between Claw Keratin And Bone Collagen Structure In A Rodent Model Of Oestrogen Deficiency, M. Clare Caraher, Antonia Sophocleous, J. Renwick Beattie, Olive O'Driscoll, Niamh M. Cummins, Orlaith Brennan, Fergal J. O'Brien, Stuart H. Ralston, Steven E.J. Bell, Mark R. Towler, Aymen I. Idris
Raman Spectroscopy Predicts The Link Between Claw Keratin And Bone Collagen Structure In A Rodent Model Of Oestrogen Deficiency, M. Clare Caraher, Antonia Sophocleous, J. Renwick Beattie, Olive O'Driscoll, Niamh M. Cummins, Orlaith Brennan, Fergal J. O'Brien, Stuart H. Ralston, Steven E.J. Bell, Mark R. Towler, Aymen I. Idris
Chemical and Biochemical Engineering Faculty Research & Creative Works
Osteoporosis is a common disease characterized by reduced bone mass and an increased risk of fragility fractures. Low bone mineral density is known to significantly increase the risk of osteoporotic fractures; however, the majority of non-traumatic fractures occur in individuals with a bone mineral density too high to be classified as osteoporotic. Therefore, there is an urgent need to investigate aspects of bone health, other than bone mass, that can predict the risk of fracture. Here, we successfully predicted association between bone collagen and nail keratin in relation to bone loss due to oestrogen deficiency using Raman spectroscopy. Raman signal …
A Constitutive Model For Entangled Polydisperse Linear Flexible Polymers With Entanglement Dynamics And A Configuration Dependent Friction Coefficient. Part I: Model Derivation, David W. Mead, Saman Monjezi, Joontaek Park
A Constitutive Model For Entangled Polydisperse Linear Flexible Polymers With Entanglement Dynamics And A Configuration Dependent Friction Coefficient. Part I: Model Derivation, David W. Mead, Saman Monjezi, Joontaek Park
Chemical and Biochemical Engineering Faculty Research & Creative Works
A new polydisperse "toy" constitutive model is derived and developed from fundamental principles and ideas governing the nonlinear rheology of linear flexible polymers [Mead et al., J. Rheol. 59, 335-363 (2015)]. Specifically, the new model is comprised of four fundamental pieces. First, the model contains a simple differential description of the entanglement dynamics of discrete entanglement pairs. Second, the model contains a differential description of the ij entanglement pair orientation tensor dynamics. Third, following a similar development by Mead and Mishler [J. Non-Newtonian Fluid Mech. 197, 61-79 and 80-90 (2013).], a diluted stretch tube is constructed to describe the relative …
A Constitutive Model For Entangled Polydisperse Linear Flexible Polymers With Entanglement Dynamics And A Configuration Dependent Friction Coefficient. Part Ii. Modeling "Shear Modification" Following Cessation Of Fast Shear Flows, David W. Mead, Saman Monjezi, Joontaek Park
A Constitutive Model For Entangled Polydisperse Linear Flexible Polymers With Entanglement Dynamics And A Configuration Dependent Friction Coefficient. Part Ii. Modeling "Shear Modification" Following Cessation Of Fast Shear Flows, David W. Mead, Saman Monjezi, Joontaek Park
Chemical and Biochemical Engineering Faculty Research & Creative Works
The polydisperse Mead-Park (MP) "toy" molecular constitutive model developed in Paper I [Mead et al., J. Rheol. 62, 121-134 (2017)] as well as our previously published work [e.g., J. Rheol. 59, 335-363 (2015)] is used in the "forward" direction to study model polydisperse melts of entangled linear flexible polymers in severe, fast shear flows. The properties of our new model are elucidated by way of numerical simulation of a representative model polydisperse polymer melt in step shear rate and interrupted shear flow. In particular, we demonstrate how the MP model simulates the individual molecular weight distribution (MWD) component dynamics as …
The Impact Of Gallium Content On Degradation, Bioactivity, And Antibacterial Potency Of Zinc Borate Bioactive Glass, Alireza Rahimnejad Yazdi, Lawrence Torkan, Wendy Stone, Mark R. Towler
The Impact Of Gallium Content On Degradation, Bioactivity, And Antibacterial Potency Of Zinc Borate Bioactive Glass, Alireza Rahimnejad Yazdi, Lawrence Torkan, Wendy Stone, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Zinc borate glasses with increasing gallium content (0, 2.5, 5, 10, and 15 Wt % Ga) were synthesized and their degradation, bioactivity in simulated body fluid (SBF), and antibacterial properties were investigated. ICP measurements showed that increased gallium content in the glass resulted in increased gallium ion release and decreased release of other ions. Degradability declined with the addition of gallium, indicating the formation of more symmetric BO3 units with three bridging oxygens and asymmetric BO3 units with two bridging oxygens in the glass network as the gallium content in the series increased. The formation of amorphous Ca-P …
A Preliminary Evaluation Of The Ability Of Keratotic Tissue To Act As A Prognostic Indicator Of Hip Fracture Risk, J. Renwick Beattie, Diane Feskanich, M. Clare Caraher, Mark R. Towler
A Preliminary Evaluation Of The Ability Of Keratotic Tissue To Act As A Prognostic Indicator Of Hip Fracture Risk, J. Renwick Beattie, Diane Feskanich, M. Clare Caraher, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Studies have shown that Raman spectroscopic analysis of fingernail clippings can help differentiate between post-menopausal women who have and who have not suffered a fracture. However, all studies to date have been retrospective in nature, comparing the proteins in nails sourced from women, post-fracture. The objective of this study was to investigate the potential of a prospective test for hip fracture based on spectroscopic analysis of nail tissue. Archived toenail samples from post-menopausal women aged 50 to 63 years in the Nurses' Health Study were obtained and analysed by Raman spectroscopy. Nails were matched case-controls sourced from 161 women; 82 …