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Silver (I)-Imidazole Cyclophane Gem-Diol Complexes Encapsulated By Electrospun Tecophilic Nanofibers: Formation Of Nanosilver Particles And Antimicrobial Activity, Abdulkareem Melaiye, Zhaohui Sun, Khadijah Hindi, Amy Milsted, Daniel Ely, Darrell Reneker, Claire Tessier, Wiley Youngs 2015 The University of Akron

Silver (I)-Imidazole Cyclophane Gem-Diol Complexes Encapsulated By Electrospun Tecophilic Nanofibers: Formation Of Nanosilver Particles And Antimicrobial Activity, Abdulkareem Melaiye, Zhaohui Sun, Khadijah Hindi, Amy Milsted, Daniel Ely, Darrell Reneker, Claire Tessier, Wiley Youngs

Wiley J. Youngs

Silver(I)-imidazole cyclophane gem-diol complex, 3 [Ag2C36 N10(O)4](2+)2(x)-, where x = OH- or CO3(2-), was synthesized and well characterized. The minimum inhibition concentration tests showed that the aqueous form of 3 is 2 times less effective as an antibiotic than 0.5% AgNO3, with about the same amount of silver. The antimicrobial activity of 3 was enhanced when encapsulated into Tecophilic polymer by electrospinning to obtain mats made of nano-fibers. The fiber mats released nanosilver particles, which in turn sustained the antimicrobial activity of the mats over a long period of time. The rate ...


Silver (I)-Imidazole Cyclophane Gem-Diol Complexes Encapsulated By Electrospun Tecophilic Nanofibers: Formation Of Nanosilver Particles And Antimicrobial Activity, Abdulkareem Melaiye, Zhaohui Sun, Khadijah Hindi, Amy Milsted, Daniel Ely, Darrell Reneker, Claire Tessier, Wiley Youngs 2015 The University of Akron

Silver (I)-Imidazole Cyclophane Gem-Diol Complexes Encapsulated By Electrospun Tecophilic Nanofibers: Formation Of Nanosilver Particles And Antimicrobial Activity, Abdulkareem Melaiye, Zhaohui Sun, Khadijah Hindi, Amy Milsted, Daniel Ely, Darrell Reneker, Claire Tessier, Wiley Youngs

Claire A. Tessier

Silver(I)-imidazole cyclophane gem-diol complex, 3 [Ag2C36 N10(O)4](2+)2(x)-, where x = OH- or CO3(2-), was synthesized and well characterized. The minimum inhibition concentration tests showed that the aqueous form of 3 is 2 times less effective as an antibiotic than 0.5% AgNO3, with about the same amount of silver. The antimicrobial activity of 3 was enhanced when encapsulated into Tecophilic polymer by electrospinning to obtain mats made of nano-fibers. The fiber mats released nanosilver particles, which in turn sustained the antimicrobial activity of the mats over a long period of time. The rate ...


A Ga3+Self-Assembled Fluorescent Probe For Atp Imaging In Vivo, Liangliang Xiao, Shiguo Sun, Zhichao Pei, Yuxin Pei, Yi Pang, Yongqian Xu 2015 University of Akron Main Campus

A Ga3+Self-Assembled Fluorescent Probe For Atp Imaging In Vivo, Liangliang Xiao, Shiguo Sun, Zhichao Pei, Yuxin Pei, Yi Pang, Yongqian Xu

Yi Pang

Adenosine 5′-triphosphate (ATP) is a functional molecule associated with many important biological processes. Fluorescent detection methods for ATP with facile performance and high selectivity are in demand. One of the possible multi-membered arrays assembled between DHBO and Ga3+ ions was conducted in aqueous solution, which can selectively recognize ATP with fluorescence enhancement from ADP, AMP and other structurally similar nucleoside triphosphates in vitro and in vivo. ATP facilitates the interaction between DHBO and Ga3+ ions, resulting in the fluorescence increase. The detection limit for ATP was calculated to be 5.49×10−7 M, which is much lower than ...


Synthesis And Electrochemical Properties Of A New Class Of Boron-Containing N-Type Conjugated Polymers, Jianfang Chai, Chao Wang, Li Jia, Yi Pang, Matthew GRaham, Stephen Cheng 2015 The University Of Akron

Synthesis And Electrochemical Properties Of A New Class Of Boron-Containing N-Type Conjugated Polymers, Jianfang Chai, Chao Wang, Li Jia, Yi Pang, Matthew Graham, Stephen Cheng

Yi Pang

Several electron-deficient polymers containing the 9,10-diboroanthracene unit have been synthesized and characterized. Electrochemical study shows that they have high electron affinities. Photoluminescence of rr-P3HT is quenched in the presence of one of the polymers in the solid state, demonstrating the potential utility of this class of polymer as powerful n-type materials in organic photovoltaic devices.


Biocompatible Flavone-Based Fluorogenic Probes For Quick Wash-Free Mitochondria! Imaging In Living Cells, Bin Liu, Mickey Shah, Ge Zhang, Qin Liu, Yi Pang 2015 University of Akron Main Campus

Biocompatible Flavone-Based Fluorogenic Probes For Quick Wash-Free Mitochondria! Imaging In Living Cells, Bin Liu, Mickey Shah, Ge Zhang, Qin Liu, Yi Pang

Yi Pang

Mitochondria, vital organelles existing in almost all eukaryotic cells, play a crucial role in energy metabolism and apoptosis of aerobic organisms. In this work, we report two new flavone-based fluorescent probes, MC-Mito1 and MC-Mito2, for monitoring mitochondria in living cells. These two probes exhibit remarkably low toxicity, good cell permeability, and high specificity; these probes complement the existing library of mitochondrial imaging agents. The new dyes give nearly no background fluorescence, and their application does not require tedious postwashing after cell staining. The appreciable tolerance of MC-Mito2 encourages a broader range of biological applications for understanding the cell degeneration and ...


Regioregular Poly(3-Alkanoylthiophene): Synthesis And Electrochemical, Photophysical, Charge Transport, And Photovoltaic Properties, Chao Wang, Felix Kim, Guoqiang Ren, Yongqian Xu, Yi Pang, Samson Jenekhe, Li Jia 2015 The University Of Akron

Regioregular Poly(3-Alkanoylthiophene): Synthesis And Electrochemical, Photophysical, Charge Transport, And Photovoltaic Properties, Chao Wang, Felix Kim, Guoqiang Ren, Yongqian Xu, Yi Pang, Samson Jenekhe, Li Jia

Yi Pang

Head-to-tail regioregular poly(3-heptanoylthiophene) (PHOT) was synthesized by Ni-catalyzed polycondensation of the 2,2-dimethyl-1,3-propanediol-protected Grignard monomer followed by deprotection. Cyclic voltammetric (CV) study demonstrates that the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of PHOT are 0.5 eV lower in energy than those of the head-to-tail poly(3-hexylthiophene) (HT-P3HT). Their optical band gaps are essentially the same. Incomplete photoluminescence (PL) quenching was observed in thin films of the 1:1 blend of PHOT and HT-P3HT. PHOT displayed a glass transition at ∼269 °C and decomposed at ∼300 °C according to differential scanning calorimetry (DSC ...


Improvement Of Mechanical Properties And Water Stability Of Vegetable Protein Based Plastics, Gowrishankar Srinivasan 2015 Iowa State University

Improvement Of Mechanical Properties And Water Stability Of Vegetable Protein Based Plastics, Gowrishankar Srinivasan

Gowrishankar Srinivasan

Bio-renewable bio-degradable plastics are a potential solution to the growing problems of pollution caused by petroleum plastics and dependency on foreign nations for petroleum resources. One possible feed stock for these materials are vegetable proteins, especially from soy bean and corn. These proteins have relatively high molecular weights and have the potential of being processed with standard polymer processing technologies. But some issues that need to be addressed are their water instability (soy protein) and inferior mechanical properties as compared to petroleum derived plastics. In this study, soy protein isolates (SPI) and zein protein was processed with various additives and ...


Catalytic Conversion Of Glycerol To Value-Added Chemical Products, Malaya Ranjan Nanda 2015 Western University

Catalytic Conversion Of Glycerol To Value-Added Chemical Products, Malaya Ranjan Nanda

Electronic Thesis and Dissertation Repository

Rapid expansion of biodiesel industry has generated a huge amount of crude glycerol. This thesis aimed to explore utilization of glycerol for the production of solketal as an oxygenated fuel additive and 1, 2-propanediol as a pre-polymer via catalytic conversion.

The thesis work may be divided into two major parts. In the first part, the thermodynamics and kinetics of the glycerol ketalization for the synthesis of solketal were investigated in a batch reactor. From this information, a continuous-flow process was designed, developed and optimized using pure glycerol. Crude glycerol (13 wt% purity) was successfully upgraded into a purified crude glycerol ...


Identification Of A Highly Specific Hydroxyapatite-Binding Peptide Using Phage Display, Marc Roy, Scott Stanley, Eric Amis, Matthew Becker 2015 The University Of Akron

Identification Of A Highly Specific Hydroxyapatite-Binding Peptide Using Phage Display, Marc Roy, Scott Stanley, Eric Amis, Matthew Becker

Eric J. Amis

A peptide sequence SVSVGMKPSPRP that selectively recognizes hydroxyapatite (HA) is identified by using a phage display approach. The engineered sequence exhibits chemical and structural specificity for HA over calcium carbonate and HA's amorphous calcium phosphate precursor. In situ binding to HA in a tooth cross section further demonstrates the sequence specificity and utility in nondestructive imaging applications.


Biocompatible Flavone-Based Fluorogenic Probes For Quick Wash-Free Mitochondria! Imaging In Living Cells, Bin Liu, Mickey Shah, Ge Zhang, Qin Liu, Yi Pang 2015 University of Akron Main Campus

Biocompatible Flavone-Based Fluorogenic Probes For Quick Wash-Free Mitochondria! Imaging In Living Cells, Bin Liu, Mickey Shah, Ge Zhang, Qin Liu, Yi Pang

Ge Zhang

Mitochondria, vital organelles existing in almost all eukaryotic cells, play a crucial role in energy metabolism and apoptosis of aerobic organisms. In this work, we report two new flavone-based fluorescent probes, MC-Mito1 and MC-Mito2, for monitoring mitochondria in living cells. These two probes exhibit remarkably low toxicity, good cell permeability, and high specificity; these probes complement the existing library of mitochondrial imaging agents. The new dyes give nearly no background fluorescence, and their application does not require tedious postwashing after cell staining. The appreciable tolerance of MC-Mito2 encourages a broader range of biological applications for understanding the cell degeneration and ...


Bioactive Surface Modification Of Metal Oxides Via Catechol-Bearing Modular Peptides: Multivalent-Binding, Surface Retention, And Peptide Bioactivity, Wen Tang, Gina Policastro, Geng Hua, Kai Guo, Chrys Wesdemiotis, Gary Doll, Matthew Becker 2015 University of Akron Main Campus

Bioactive Surface Modification Of Metal Oxides Via Catechol-Bearing Modular Peptides: Multivalent-Binding, Surface Retention, And Peptide Bioactivity, Wen Tang, Gina Policastro, Geng Hua, Kai Guo, Chrys Wesdemiotis, Gary Doll, Matthew Becker

Gary L. Doll

A series of multivalent dendrons containing a bioactive osteogenic growth peptide (OGP) domain and surface-binding catechol domains were obtained through solid phase synthesis, and their binding affinity to hydroxyapatite, TiO2, ZrO2, CeO2, Fe3O4 and gold was characterized using a quartz crystal microbalance with dissipation (QCM-d). Using the distinct difference in binding affinity of the bioconjugate to the metal oxides, TiO2-coated glass slides were selectively patterned with bioactive peptides. Cell culture studies demonstrated the bioavailability of the OGP and that OGP remained on the surface for at least 2 weeks under in vitro cell culture conditions. Bone sialoprotein (BSP) and osteocalcein ...


Three-Dimensional Confocal Microscopy Indentation Method For Hydrogel Elasticity Measurement, Donghee Lee, Md Mahmudur Rahman, You Zhou, Sangjin Ryu 2015 University of Nebraska-Lincoln

Three-Dimensional Confocal Microscopy Indentation Method For Hydrogel Elasticity Measurement, Donghee Lee, Md Mahmudur Rahman, You Zhou, Sangjin Ryu

Md Mahmudur Rahman

No abstract provided.


"Click" Reactions: A Versatile Toolbox For The Synthesis Of Peptide-Conjugates, Wen Tang, Matthew Becker 2015 University of Akron Main Campus

"Click" Reactions: A Versatile Toolbox For The Synthesis Of Peptide-Conjugates, Wen Tang, Matthew Becker

Matthew Becker

Peptides that comprise the functional subunits of proteins have been conjugated to versatile materials (biomolecules, polymers, surfaces and nanoparticles) in an effort to modulate cell responses, specific binding affinity and/or self-assembly behavior. However, the efficient and convenient synthesis of peptide-conjugates, especially the constructs with multiple types of peptide functionality remains challenging. In this critical review, we focus on "click" reactions that have been used to synthesis peptide-functionalized conjugates, introducing their reaction conditions, specifically elucidating parameters that influence reaction kinetics and total conversion, and highlighting examples that have been completed recently. Moreover, orthogonal "click" reactions that synthesize multi-functional biomaterials in ...


Three-Dimensional Bicontinuous Graphene Monolith From Polymer Templates, Kewei Liu, Yu-Ming Chen, Gina Policastro, Matthew Becker, Yu Zhu 2015 University of Akron Main Campus

Three-Dimensional Bicontinuous Graphene Monolith From Polymer Templates, Kewei Liu, Yu-Ming Chen, Gina Policastro, Matthew Becker, Yu Zhu

Matthew Becker

The two-dimensional single-layer and few-layered graphene exhibit many attractive properties such as large specific surface area and high charge carrier mobility. However, graphene sheets tend to stack together and form aggregates, which do not possess the desirable properties associated with graphene. Herein, we report a method to fabricate three-dimensional (3D), bicontinuous graphene monolith through a versatile hollow nickel (Ni) template derived from polymer blends. The poly(styrene)/poly(ethylene oxide) were used to fabricate a bicontinuous gyroid template using controlled phase separation. The Ni template was formed by electroless metal depositing on the polymer followed by removing the polymer phase ...


Dopamine-Based Copper-Free Click Kit For Efficient Surface Functionalization, Matthew Becker, Alamgir Karim, Ying Chen, Jukuan Zheng 2015 University of Akron

Dopamine-Based Copper-Free Click Kit For Efficient Surface Functionalization, Matthew Becker, Alamgir Karim, Ying Chen, Jukuan Zheng

Matthew Becker

Strain-promoted azide–alkyne cycloaddition reactions are combined with a dopamine functional species to generate a highly efficient method for surface modification. The resulting conjugate containing 4-dibenzocyclooctynol (DIBO) and dopamine results in a versatile surface labeling technology that can replicate patterns generated from photolithography and microcontact printing techniques.


Bioactive Surface Modification Of Metal Oxides Via Catechol-Bearing Modular Peptides: Multivalent-Binding, Surface Retention, And Peptide Bioactivity, Wen Tang, Gina Policastro, Geng Hua, Kai Guo, Chrys Wesdemiotis, Gary Doll, Matthew Becker 2015 University of Akron Main Campus

Bioactive Surface Modification Of Metal Oxides Via Catechol-Bearing Modular Peptides: Multivalent-Binding, Surface Retention, And Peptide Bioactivity, Wen Tang, Gina Policastro, Geng Hua, Kai Guo, Chrys Wesdemiotis, Gary Doll, Matthew Becker

Matthew Becker

A series of multivalent dendrons containing a bioactive osteogenic growth peptide (OGP) domain and surface-binding catechol domains were obtained through solid phase synthesis, and their binding affinity to hydroxyapatite, TiO2, ZrO2, CeO2, Fe3O4 and gold was characterized using a quartz crystal microbalance with dissipation (QCM-d). Using the distinct difference in binding affinity of the bioconjugate to the metal oxides, TiO2-coated glass slides were selectively patterned with bioactive peptides. Cell culture studies demonstrated the bioavailability of the OGP and that OGP remained on the surface for at least 2 weeks under in vitro cell culture conditions. Bone sialoprotein (BSP) and osteocalcein ...


Branched Amino Acid Based Poly(Ester Urea)S With Tunable Thermal And Water Uptake Properties, Jiayi Yu, Fei Lin, Matthew Becker 2015 University of Akron Main Campus

Branched Amino Acid Based Poly(Ester Urea)S With Tunable Thermal And Water Uptake Properties, Jiayi Yu, Fei Lin, Matthew Becker

Matthew Becker

A series of amino-acid based poly(ester urea)s (PEU) with controlled amounts of branching was synthesized and characterized. The mechanical properties, thermal characteristics and water absorptions varied widely with the extent of branch unit incorporation. Herein, the details of the synthesis of a linear bis(l-phenylalanine)-hexane 1,6-diester monomer, a branch tri-O-benzyl-l-tyrosine-1,1,1-trimethylethane triester monomer and a series of copolymers are described. The extent of branching was varied by adjusting the molar ratio of linear to branched monomer during the interfacial polymerization. The elastic moduli span a range of values (1.0–3.1 GPa) that overlaps ...


Synthesis, Characterization, And Thermoelectric Properties Of Radical Siloxanes, Arnold J. Eng, Bryan Boudouris, Edward P. Tomlinson, Martha Emily Hay 2015 Georgia Institute of Technology - Main Campus

Synthesis, Characterization, And Thermoelectric Properties Of Radical Siloxanes, Arnold J. Eng, Bryan Boudouris, Edward P. Tomlinson, Martha Emily Hay

The Summer Undergraduate Research Fellowship (SURF) Symposium

More than half of the annual energy consumption in the United States is lost as waste heat. Polymer-based thermoelectric devices have the potential to utilize this waste heat both sustainably and cost-effectively. Although conjugated polymers currently dominate research in organic thermoelectrics, the potential of using polymers with radical pendant groups have yet to be realized. These polymers have been found to be as conductive as pristine (i.e., not doped) poly(3-hexylthiophene) (P3HT), a commonly-used charge-transporting conjugated polymer. This could yield promising avenues for thermoelectric material design as radical polymers are more synthetically tunable and are hypothesized to have a ...


Biodegradable Nano-Hybrid Polymer Composite Networks For Regulating Cellular Behavior, Charles Henley Sprague 2015 University of Tennessee - Knoxville

Biodegradable Nano-Hybrid Polymer Composite Networks For Regulating Cellular Behavior, Charles Henley Sprague

Masters Theses

Photo-crosslinkable polymeric biomaterials have emerged in the field of biomedical research to promote tissue regeneration. For example, scaffolds that can be crosslinked and hardened in situ have been known to make suitable implant alternatives. Since injectable and photo-crosslinkable biomaterials offer the advantage of being minimally invasive, they have emerged to compete with autografts, a current highly invasive method to repair diseased tissue. A series of novel photo-crosslinkable, injectable, and biodegradable nano-hybrid polymers consisting of poly(ε-caprolactone fumarate) (PCLF) and polyhedral oligomeric silsesquioxane (POSS) has been synthesized in our laboratory via polycondensation. To engineer the material properties of the nano-hybrid networks ...


A Study Of Diblock Copolymer/Charged Particle Nanoporous Membranes; Morphology, Design And Transport Property Modeling, Bo Zhang 2015 University of Tennessee - Knoxville

A Study Of Diblock Copolymer/Charged Particle Nanoporous Membranes; Morphology, Design And Transport Property Modeling, Bo Zhang

Doctoral Dissertations

A combination of self-consistent field theory and density functional theory was used to examine the stable, 3-dimensional equilibrium morphologies formed by diblock copolymers with a neutral or charged nanoparticle attached either between the two blocks or at the end of copolymer. Particle size was varied between one and four tenths of the radius of gyration of the copolymer. Phase diagrams were constructed and analyzed in terms of thermodynamic diagrams to understand the molecular-level self-assembly processes with the aim of determining the appropriate morphologies used as nanoporous membranes, (i.e. the periodic, hexagonal arrays of cylinders wherein the particles would primarily ...


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