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Showing 1 to 20 of 59 for “"PEMS"”.

  1. Synthesis and Characterization of Hydrophilic-Hydrophobic Disulfonated Poly(Arylene Ether Sulfone)-Decafluoro Biphenyl Based Poly(Arylene Ether) Multiblock Copolymers for Proton Exchange Membranes (PEMs)

    Yu, XiangVirginia Tech2008

    … block copolymers as proton exchange membranes (PEMs) has become an emerging area of research in recent years. Three series of hydrophilic/hydrophobic, fluorinated/sulfonated multiblock copolymers were synthesized and characterized in this thesis. These copolymers were obtained through moderate …

    vt Repository record

  2. Printed Educational Materials for Primary Care Physicians

    Grudniewicz, Agnieszka2015

    … examines printed educational materials (PEMs) as a tool to facilitate the dissemination of clinical information for PCPs. I use the Technology Acceptance Model to study how the perceived ease of use and perceived usefulness of PEMs influences PCP attitude, intention, and use of PEMs. This …

    toronto-retro Repository record

  3. The Design of Antimicrobial Detachable Thin Films for the Study of Hepatic Infections

    Cassin, Margaret EmilyVirginia Tech2015

    … acid polyelectrolyte multilayers (PEMs) with the natural antimicrobial peptide, LL-37 to study hepatic infections. LL-37 was physisorbed and covalently linked to the surface of the PEMs. Escherichia coli DH10B were cultured in the presence of LL-37modified PEMs in bacterial adhesion …

    vt Repository record

  4. The Design of Polyelectrolyte Multilayers Using Galactosylated Chitosan

    Arca, Hale CigdemVirginia Tech2012

    … interaction. Polyelectrolyte multilayers (PEMs) were prepared by the layer by layer method, which is based on electrostatic attractions between oppositely charged polyelectrolytes (PEs). Anionic (hyaluronic acid) and cationic (chitosan and galactosylated chitosan) PEs were used in the …

    vt Repository record

  5. Evaluation of layer-by-layer assembly of polyelectrolyte multilayers in cell patterning technology

    White, Aleksandr John, 1976-Massachusetts Institute of Technology2002

    … In this work, polyelectrolyte multilayers (PEMs) were evaluated as a platform for applications in controlling the spatial adhesion of living cells. An overview is presented on current developments and competing technologies within research and industry with respect to cell patterning and …

    mit Repository record

  6. Eventi precoci nel processo di interazione tra Cellule Staminali Mesenchimali e Biomateriali polimerici (PSS e PEI Multilayers)

    ALBA, ANNAUniversità degli studi di Catania2015

    … realizzazione di multistrati di polielettroliti (PEMs) su materiali impiantabili è un'ottima strategia per realizzare condizioni che possano promuovere o prevenire l'adesione cellulare, o ancora più importante dirigerne e mantenerne il fenotipo. La versatilità dei PEMs fornisce la straordinaria …

    catania Repository record

  7. Polymer electrolyte membranes for direct methanol fuel cells

    PEI HAIQIN2007

    … proton-conducting polymer electrolyte membranes (PEMs) for direct methanol fuel cells (DMFCs). In this thesis, relatively inexpensive monomers, 2-acrylamido-2-methyl propanesulfonic acid (AMPS) and 3-sulfopropyl methacrylate (SPM) in particular, were deployed as the proton source in a …

    nus Repository record

  8. Assembly and post-assembly manipulation of polyelectrolyte multilayers for control of bacterial attachment and viability

    Lichter, Jenny, 1982-Massachusetts Institute of Technology2009

    … by varying the pH of assembly, we developed PEMs of identical chemical composition (polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA)) with distinct mechanical moduli (1-100 MPa). Once characterized, these PEMs showed that, under certain conditions, bacterial attachment correlated …

    mit Repository record

  9. Statistical Analysis of Electric Energy Markets with Large-Scale Renewable Generation Using Point Estimate Methods

    Sanjab, Anibal JeanVirginia Tech2014

    … In this thesis, the Point Estimate Methods (PEMs) are applied to the optimal power flow (OPF) problem to estimate the statistical moments of the locational marginal prices (LMPs) and total generation cost under system uncertainty. An extensive mathematical examination and risk analysis of …

    vt Repository record

  10. Improving blood compatibility of surfaces using tanfloc and carboxymethyl-kappa-carrageenan polyelectrolyte multilayers

    Baghersad, Somayeh, author, Kipper, Matt J., advisor, Popat, Ketul C., advisor, Ghosh, Soham, committee member, Herrera-Alonso, Margarita, committee member, Martins, Alessandro F., committee memberColorado State University. Libraries2025

    … on developing polyelectrolyte multilayers (PEMs) using tanfloc (TAN), an amphoteric antimicrobial polymer, as both a polycation and polyanion. These PEMs showed strong antibacterial activity and excellent biocompatibility, providing a foundation for multifunctional coatings. The second aim …

    colostate Repository record

  11. Polyelectrolyte multilayers for tunable release of antibiotics and other therapeutics

    Chuang, Helen FMassachusetts Institute of Technology2008

    Polyelectrolyte multilayers (PEMs) were fabricated via the layer-by-layer (LbL) deposition process, incorporating hydrolytically degradable poly([beta]-amino esters) to result in biodegradable PEMs that can release active ingredients in a dosage- and rate-tunable fashion. Specifically, PEMs …

    mit Repository record

  12. Polysaccharide-based nanostructures for growth factor delivery and mesenchymal stem cell activation

    Almodovar Montanez, Jorge Luis, author, Kipper, Matt J., advisor, Bailey, Travis S., committee member, Kisiday, John D., committee member, Prasad, Ashok, committee memberColorado State University. Libraries2011

    … including polyelectrolyte multilayers (PEMs) and electrospun nanofibers. On flat gold-coated glass surfaces, PEMs were constructed using the polycations chitosan and N,N,N -trimethyl chitosan, and the polyanions hyaluronan, chondroitin sulfate, and heparin. An exhaustive spectroscopic …

    colostate Repository record

  13. Delivery of Myoglobin Polymersomes Results in Tumor Hemorrhagic Necrosis and Enhanced Radiation Response

    Hofmann, Christina Lehmkuhl2015

    … the use of polymersome-encapsulated myoglobin (PEMs) with the hypothesis that O2-releasing PEMs will increase tumor oxygenation, and thereby improve response to radiotherapy. Mb was chosen as an O2 carrying protein to deliver to tumors because it has a strong association to O2, providing a …

    duke Repository record

  14. Experimental Studies on the Mechanical Durability of Proton Exchange Membranes

    Li, YongqiangVirginia Tech2008

    … durability of proton exchange membranes (PEMs). The first two methods involved measuring the in-plane biaxial strength of PEMs and the biaxial hygrothermal stresses that occur in PEMs during hygrothermal cycles. The third method investigated the nonuniform thickness and compressibility of …

    vt Repository record

  15. MULTISCALE COMPUTATIONAL MODELING OF NANOSTRUCTURE AND TRANSPORT IN POLYMER ELECTROLYTE MEMBRANE FUEL CELLS

    Lawler, Robin MayGeorgia Institute of Technology2022

    … Specifically, Aim 1 aids in the design of PEMs resistant to hot or dry conditions by offering novel insight into how PEM nanostructure influences proton transport in low-humidity conditions. Aim 2 involves the elucidation of the CeO2 radical scavenging mechanisms in PEMs, as well as the …

    gatech Repository record

  16. PH-gated porosity and reversible swelling transitions in polyelectrolyte multilayers

    Hiller, Jeri' Ann, 1976-Massachusetts Institute of Technology2003

    … as well as pH-gated nano- and microporosity in PEMs, are described. The PEMs in this thesis are created by an aqueous processing technique, which enables the straightforward manipulation of processing variables to create molecular-level designed polymeric coatings. The first part of this thesis …

    mit Repository record

  17. Proteomic Analysis of Three Dimensional Organotypic Liver Models

    Vu, Lucas TrungVirginia Tech2015

    … for systematic evaluation of the cells and PEMs. In this study, proteomes of hepatocytes from PEM containing models, cultured with and without LSECs, were compared to those from monolayers. Changes in core metabolism were evaluated among all culture conditions. Overall, all cultures were …

    vt Repository record

  18. Fundamental studies of polyelectrolyte multilayer films : optical, mechanical, and lithographic property control

    Nolte, Adam JohnMassachusetts Institute of Technology2007

    Polyelectrolyte multilayers (PEMs) are a versatile type of thin film that is created via layer-by-layer assembly of positively and negatively charged polymers from aqueous solutions. Precise control of the PEM thickness, chemical functionality, and molecular architecture is made possible by …

    mit Repository record

  19. Towards personal fabrications : tabletop tools for micron and sub-micron scale functional rapid prototyping

    Griffith, Saul Thomas, 1974-Massachusetts Institute of Technology2001

    … tools represent methods for the manufacture of PEMS, or Printed micro Electro Mechanical Systems, and are enabled because they exploit the novel properties of nanocrystalline materials and their interactions with energetic beams. UV contact mask lithography was used to directly pattern metallic …

    mit Repository record

  20. Polyelectrolyte multilayers incorporating photocrosslinking polymers for controlling 2- and 3-dimensional structure

    Olugebefola, Solar Candido AdemolaMassachusetts Institute of Technology2007

    … a number of useful and novel functionalities. PEMs interact favorably with proteins and other biomolecules making them potentially valuable as biomaterials. Many systems of polymers have been studied for use in PEMs, including weak polyelectrolytes such as those containing poly(acrylic acid) …

    mit Repository record

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