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https://www.readbyqxmd.com/read/28328214/proton-conductance-of-a-superior-water-stable-metal-organic-framework-and-its-composite-membrane-with-poly-vinylidene-fluoride
#1
Hong-Bin Luo, Mei Wang, Shao-Xian Liu, Chen Xue, Zheng-Fang Tian, Yang Zou, Xiao-Ming Ren
Proton-exchange membranes (PEMs) as separators have important technological applications in electrochemical devices, including fuel cells, electrochemical sensors, electrochemical reactors, and electrochromic displays. The composite membrane of a proton-conducting metal-organic framework (MOF) and an organic polymer combines the unique physical and chemical nature of the polymer and the high proton conductivity of the MOF, bringing together the best of both components to potentially fabricate high-performance PEMs...
March 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28328175/preparation-and-application-of-epitope-magnetic-molecularly-imprinted-polymers-for-enrichment-of-sulfonamide-antibiotics-in-water
#2
Yufeng Hu, Cheng Wang, Xiangdao Li, Lifen Liu
Sulfonamides, which are widely used synthetic antibiotics, are hydrophilic and stable. They can easily migrate into the environment and aquatic animals, and increase the risk of cancer, drug resistance, and allergic symptoms if consumed by humans. Here, we developed an epitope magnetic imprinting approach to enrich multiple sulfonamide antibiotics from a water sample. Epitope magnetic molecularly imprinted polymers (EMMIPs) were prepared by free-radical polymerization using vinyl-functioned Fe3 O4 as a core, sulfanilamide (SA) as a dummy template, methacrylic acid as a functional monomer, and ethylene glycol dimethacrylate as a cross-linker...
March 22, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28325313/a-structural-basis-for-the-amphiphilic-character-of-alginates-implications-for-membrane-fouling
#3
Matthew B Stewart, Darli T Myat, Michael Kuiper, Richard J Manning, Stephen R Gray, John D Orbell
Ostensibly hydrophilic alginates are known to foul hydrophobic membranes, under various conditions. Here, controlled experiments have been conducted at high and low pH on the fouling of a polypropylene membrane by alginate and the results suggest that the observed fouling is due to an intrinsic property of the alginate. Thus quantum chemical calculations on the M and G monomers of alginate reveal that M adopts an equilibrium geometry that is hydrophilic on one face and hydrophobic on the other, i.e. is potentially amphiphilic...
May 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28321953/synthesis-of-poly-vitamin-c-through-admet
#4
Serter Luleburgaz, Meir Abuaf, Umit Tunca, Gurkan Hizal, Hakan Durmaz
l-Ascorbic acid, commonly known as vitamin C and one of the most important biological compounds, is converted to a α,ω-diene monomer and subsequently polymerized for the first time by acyclic diene metathesis. Various experimental conditions such as polymerization medium, catalyst type, temperature, and monomer/catalyst ratio are studied. The moderate molecular weight polymers are achieved when the polymerizations are conducted under bulk conditions employing the Grubbs first generation (G1) or Hoveyda-Grubbs second generation catalyst (HG-2)...
March 21, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28320456/thiolation-of-arabinoxylan-and-its-application-in-the-fabrication-of-controlled-release-mucoadhesive-oral-films
#5
Muhammad Hanif, Muhammad Zaman
BACKGROUND: Mucoadhesion is an important property that helps oral drug delivery system to remain attached with buccal mucosa and hence to improve the delivery of the drug. The current study was designed to achieve the thiol modification of Arabinoxylan (ARX) and to develop a mucoadhesive oral film for the improved delivery of tizanidine hydrochloride (TZN HCl). METHOD: Synthesis of thiolated arabinoxylan (TARX) was accomplished by esterification of ARX with thioglycolic acid (TGA)...
March 20, 2017: Daru: Journal of Faculty of Pharmacy, Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28319748/modulation-of-vascular-function-and-anti-aggregation-effect-induced-by-1%C3%A2-3-1%C3%A2-6-%C3%AE-d-glucan-of-saccharomyces-cerevisiae-and-its-carboxymethylated-derivative-in-rats
#6
Lorena Soares Bezerra, Marciane Magnani, Raul Jorge Hernan Castro-Gomez, Hassler Clementino Cavalcante, Tays Amanda Felisberto da Silva, Renata Layne Paixão Vieira, Isac Almeida de Medeiros, Robson Cavalcante Veras
BACKGROUND: β-d-Glucans are polysaccharides found in the cell walls of yeasts, such as Saccharomyces cerevisiae, and they have been studied because of their beneficial effects on health, mainly in terms of immunomodulation. However, information on the action of these polymers on vascular and platelet function is still scarce. This study evaluate the effect of (1→3) (1→6) β-d-glucan (βG-Sc) and its carboxymethylated derivative (CM-G) on vascular and platelet function in rats. METHODS: The animals received daily oral treatments with βG-Sc (20mg/kg) and CM-G (20mg/kg) for eight days...
January 12, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/28319668/tuning-the-magnitude-and-the-polarity-of-the-piezoresistive-response-of-polyaniline-through-structural-control
#7
Melda Sezen-Edmonds, Petr P Khlyabich, Yueh-Lin Loo
We demonstrate the tunability of both the polarity and the magnitude of the piezoresistive response of polyaniline that is template-synthesized on poly(2-acrylamido-2-methyl-1-propanesulfonic acid), PANI-PAAMPSA, by altering the template molecular weight. Piezoresistivity is quantified by gauge factor, a unitless parameter that relates changes in electrical resistance to applied strain. The gauge factor of PANI-PAAMPSA decreases linearly and becomes negative with decreasing PAAMPSA molecular weight. The polarity of PANI-PAAMPSA's gauge factor is determined by macroscopic connectivity across thin films...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28319382/time-resolved-spectroscopic-investigation-of-charge-trapping-in-carbon-nitrides-photocatalysts-for-hydrogen-generation
#8
Robert Godin, Yiou Wang, Martijn A Zwijnenburg, Junwang Tang, James R Durrant
Carbon nitride (g-C3N4) as a benchmark polymer photocatalyst is attracting significant research interest because of its visible light photocatalytic performance combined with good stability and facile synthesis. However, little is known about the fundamental photophysical processes of g-C3N4, which are key to explain and promote photoactivity. Using time-resolved absorption and photoluminescence spectroscopies, we have investigated the photophysics of a series of carbon nitrides on timescales ranging from femtoseconds to seconds...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28319362/tuning-the-work-function-of-printed-polymer-electrodes-by-introducing-a-fluorinated-polymer-to-enhance-the-operational-stability-in-bottom-contact-organic-field-effect-transistors
#9
Se Hyun Kim, Jiye Kim, Sooji Nam, Hwa Sung Lee, Seung Woo Lee, Jaeyoung Jang
Poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) is a promising electrode material for organic electronic devices due to its high conductivity, good mechanical flexibility, and feasibility of easy patterning with various printing methods. The work function of PEDOT:PSS needs to be increased for efficient hole injection and the addition of a fluorine-containing material has been reported to increase the work function of PEDOT:PSS. However, it remains a challenge to print PEDOT:PSS electrodes while simultaneously tuning their work functions...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28318228/expedited-phonon-transfer-in-interfacially-constrained-polymer-chain-along-self-organized-amino-acid-crystals
#10
Liwen Mu, Yifan Li, Nitin Mehra, Tuo Ji, Jiahua Zhu
In this work, polyvinyl alcohol (PVA)/amino acid (AA) composites were prepared by a self-organized crystallization process. Five different AAs (cysteine, aspartic acid, glutamic acid, ornithine-HCl and lysine-HCl) were selected based on their similar functional groups but different molecular structure. The different PVA-AA interactions in the five PVA/AA composites lead to two crystal patterns, i.e. continuous network (cysteine and lysine-HCl) and discrete particles (glutamic acid, ornithine-HCl and aspartic acid)...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28317940/size-tunable-synthesis-of-silver-nanobelts-using-a-polyaniline-derived-polymer-as-a-template
#11
Sudakar Padmanaban, Minog Kim, Sungho Yoon
Silver nanobelts (AgNBs) have attracted a great interest due to their excellent electrical conductivity and mechanical strength, leading a facile synthesis of these AgNBs in great demand. In here, we are reporting a simple, aqueous phase, size tunable synthesis of smooth surfaced 1D-silver nanobelts using a Polyaniline (PANi) derived polymer at room temperature. The specifically designed PANi polymer, comprising a pendant carboxyl group in the chain, acted as both a reducing agent and template. The resulting Ag nanobelts have more than 10 μm of length, mean width values ranging from 41...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317929/high-thermoelectric-power-factor-of-a-diketopyrrolopyrrole-based-low-bandgap-polymer-via-finely-tuned-doping-engineering
#12
In Hwan Jung, Cheon Taek Hong, Un-Hak Lee, Young Hun Kang, Kwang-Suk Jang, Song Yun Cho
We studied the thermoelectric properties of a diketopyrrolopyrrole-based semiconductor (PDPP3T) via a precisely tuned doping process using Iron (III) chloride. In particular, the doping states of PDPP3T film were linearly controlled depending on the dopant concentration. The outstanding Seebeck coefficient of PDPP3T assisted the excellent power factors (PFs) over 200 μW m(-1)K(-2) at the broad range of doping concentration (3-8 mM) and the maximum PF reached up to 276 μW m(-1)K(-2), which is much higher than that of poly(3-hexylthiophene), 56 μW m(-1)K(-2)...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28314370/room-temperature-processable-wire-templated-nano-electrodes-for-flexible-and-transparent-all-wire-electronics
#13
Sung-Yong Min, Yeongjun Lee, Se Hyun Kim, Cheolmin Park, Tae-Woo Lee
Sophisticate preparation of arbitrarily-long conducting nanowire electrodes on large area is a significant requirement for development of transparent nano-electronics. We report position-customizable and room-temperature-processable metallic nanowire (NW) electrodes array using aligned NW templates and a demonstration of transparent all-NW-based electronic applications by simple direct-printing. Well-controlled electroless-plating chemistry on a polymer NW template provided a highly-conducting Au NW array with a very low resistivity of 7...
March 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28306233/coaxial-three-layered-carbon-sulfur-polymer-nanofibers-with-high-sulfur-content-and-high-utilization-for-lithium-sulfur-batteries
#14
Feng He, Jian Ye, Yuliang Cao, Lifen Xiao, Hanxi Yang, Xinping Ai
Great progress has been made on the cyclability and material utilization in recent development of lithium-sulfur (Li-S) batteries; however, most of the sulfur electrodes reported so far have a considerable low loading of sulfur (60%), which causes a substantial decrease of energy density and is therefore difficult for battery applications. To deal with this issue, we fabricate a novel sulfur composite with a coaxial three-layered structure, in which sulfur is deposited on carbon fibers and coated with poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate)(PEDOT/PSS), thus enabling a high sulfur loading of 70...
March 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28306173/investigation-of-the-role-of-template-features-on-the-electrically-induced-structure-formation-eisf-for-a-faithful-duplication
#15
Hongmiao Tian, Jinyou Shao, Xiaoliang Chen, Wei Jiang, Li Wang, Yucheng Ding
Electrically induced structure formation (EISF), as a physical approach to fabricate micro/nano-structures, has attracted much attention because of the simple process, low cost, high efficiency and wide applications on electronics, microfluidics, and so forth. Hitherto, the influence of some process parameters, such as voltage, air gap, film thickness, polymer properties, on the polymeric behavior and the structure formation has been explored, neglecting the effects of the template features, which affect the polymer deformation...
March 17, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28302968/electrodes-modified-with-composite-layers-based-on-poly-3-4-ethylenedioxythiophene-as-sensors-for-paracetamol
#16
Karolina Sipa, Ewelina Socha, Slawomira Skrzypek, Pawel Krzyczmonik
Two sensors for paracetamol were obtained on the basis of a GC electrode modified with poly(3,4-ethylenedioxythiophene) (PEDOT). The first sensor was a GC electrode modified with a conductive composite layer of PEDOT doped with poly(4-lithium styrenesulfonic acid) (PSSLi), and the second one was a GC electrode modified by a composite of PEDOT doped with PSSLi and multiwall carbon nanotubes (MWCNT). A conductive PEDOT polymer film was used as an electron mediator with a rich electron cloud. Both sensors were developed for the determination of paracetamol (ACOP) in the presence of interference compounds...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302466/bioflow-iii-satellite-one-year-clinical-outcomes-of-diabetic-patients-treated-with-a-biodegradable-polymer-sirolimus-eluting-stent-and-comprehensive-medical-surveillance
#17
Ran Kornowski, Ariel Roguin, Haim Danenberg, Hana Vaknin Assa, Eitan Abergel, Eliezer Rozenbaum, Victor Guetta, Uri Landes, Refat Jabara, Amnon Merdler, Amit Segev, Morris Mosseri, Abid Assali
BACKGROUND: Drug-eluting stents with biodegradable polymer might be particularly useful in diabetic patients who are at increased risk for target lesion/target vessel revascularization. We therefore aimed at assessing the safety and performance of a biodegradable polymer sirolimus-eluting stent (BP-SES) in combination with comprehensive optimal medical therapy following coronary interventions. METHODS: This prospective, multicenter registry was conducted at six centers in Israel...
February 21, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28301829/ionic-crosslinking-of-imidazolium-functionalized-poly-aryl-ether-ketone-by-sulfonated-poly-ether-ether-ketone-for-anion-exchange-membranes
#18
Yixin Xu, Niya Ye, Dengji Zhang, Jingshuai Yang, Ronghuan He
Two N3-substituted imidazoles 1,2-dimethylimidazole and 1-butyl-2-methylimidazole were chosen to functionalize poly(aryl ether ketone), respectively. The generated imidazolium cations could electrostatically react with sulfonate ions of the sulfonated poly(ether ether ketone) forming the ionic crosslinking structure of the membranes. The changes in crosslinking degree and the alkyl chain-length on N3 site of the imidazoliums could highly affect the properties of the anion exchange membranes (AEMs). The AEMs functionalized by 1-butyl-2-methylimidazole exhibited superior properties compared to those functionalized by 1,2-dimethylimidazole according to the tolerance tests of the AEMs towards hot alkaline solutions...
March 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28300234/structural-and-transport-properties-of-neutral-radical-crystals-of-co-iii-tmp-cn-2-tmp-5-10-15-20-tetramethylporphyrinato-and-the-cn-bridged-polymer-co-iii-tmp-cn-n
#19
Masashi Kurokawa, Judy Fe F Jose-Larong, Hiroyuki Hasegawa, Yukihiro Takahashi, Jun Harada, Tamotsu Inabe
An axially ligated Co(tmp) (tmp = 5,10,15,20-tetramethylporphyrinato) anion, [Co(III)(tmp)(CN)2](-), has been prepared and subjected to electrochemical oxidation to obtain the open shell tmp π-ligand. With acetone as the solvent, solvent-free neutral radical crystals of Co(III)(tmp)(CN)2 are obtained, whereas solvent-inclusive crystals of Co(III)(tmp)(CN)2·2CH3CN are obtained with CH3CN as the solvent. In both crystals, the open shell tmp ring deforms into a ruffled form, which makes the π-π interactions in the crystal weak...
March 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28294979/evaluation-of-stability-of-amylose-inclusion-complexes-depending-on-guest-polymers-and-their-application-to-supramolecular-polymeric-materials
#20
Tomonari Tanaka, Atsushi Tsutsui, Kazuya Tanaka, Kazuya Yamamoto, Jun-Ichi Kadokawa
This paper describes the evaluation of the stability of amylose-polymer inclusion complexes under solution state in dimethyl sulfoxide (DMSO) depending on guest polymers. The three complexes were prepared by the vine-twining polymerization method using polytetrahydrofuran (PTHF), poly(ε-caprolactone) (PCL), and poly(l-lactide) (PLLA) as guest polymers. The stability investigation was conducted at desired temperatures (25, 30, 40, 60 °C) in DMSO solutions of the complexes. Consequently, the amylose-PTHF inclusion complex was dissociated at 25 °C, while the other complexes were stable under the same conditions...
March 15, 2017: Biomolecules
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