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https://www.readbyqxmd.com/read/29149687/pyrrolidinyl-pna-polypyrrole-silver-nanofoam-electrode-as-a-novel-label-free-electrochemical-mirna-21-biosensor
#1
Tawatchai Kangkamano, Apon Numnuam, Warakorn Limbut, Proespichaya Kanatharana, Tirayut Vilaivan, Panote Thavarungkul
A label-free electrochemical miRNA biosensor was developed based on a pyrrolidinyl peptide nucleic acid (acpcPNA)/polypyrrole (PPy)/silver nanofoam (AgNF) modified electrode. The AgNF was electrodeposited as redox indicator on a gold electrode, which was then functionalized with an electropolymerized layer of PPy, a conducting polymer, to immobilize the PNA probes. The fabrication process was investigated by electrochemical impedance spectroscopy. The biosensor was used to detect miRNA-21, a biomarker abnormally expressed in most cancers...
November 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29149529/scalable-fabrication-of-highly-active-and-durable-membrane-electrodes-toward-water-oxidation
#2
Yu Li, Shuangming Chen, Dawei Xi, Yanan Bo, Ran Long, Chengming Wang, Li Song, Yujie Xiong
The electrocatalytic oxygen evolution reaction (OER) is a highly important reaction that requires a relatively high overpotential and determines the rate of water splitting-a process for producing hydrogen. The overall OER performance is often largely limited by uncontrollable interface when active catalysts are loaded on conductive supports, for which polymer binders are widely used, but inevitably block species transportation channels. Here, a scalable fabrication approach to freestanding graphitized carbon nanofiber networks is reported, which provides abundant sites for in situ growing Fe/Ni catalysts with the improved interface...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29148782/effect-of-side-chain-branching-on-enhancement-of-ionic-conductivity-and-capacity-retention-of-copolymer-electrolyte-membrane
#3
Guopeng Fu, Thein Kyu
Low current drain driven by the low ionic conductivity of solid polymer electrolyte is one of the major obstacles of solid state battery. In an effort to improve the ionic conductivity, polyethylene glycol diacrylate (PEGDA) and monofunctional polyethylene glycol methyl ether acrylate (PEGMEA) were copolymerized via photopolymerization to afford PEGDA network with dangling PEGMEA side chains. By attaching PEGMEA side branches to the PEGDA network backbone, the glass transition temperature (Tg) was found to decrease, which may be controlled by varying relative amounts of PEGMEA and PEGDA...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148610/can-coordination-driven-supramolecular-self-assembly-reactions-be-conducted-from-fully-aliphatic-linkers
#4
Christophe Lescop, Mehdi Elsayed Moussa, Sloane Evariste, Barbara Kräemer, Régis Réau, Manfred Scheer
A series of fully aliphatic cyano-capped ditopic linkers with increasing lengths were reacted with a pre-assembled Cu(I) bimetallic molecular clip bearing short intermetallic distances. It is shown that, depending on the length of the ditopic linkers, a rational design of unprecedented supramolecular compact metallacycles bearing fully aliphatic walls is possible. The specific pre-organized molecular arrangement of the molecular clip used favors stabilizing interlinker London dispersion interactions allowing, as the linkers' lengths increase, the selective formation of discrete compact metallacycles at the expense of 1D coordination polymers...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29148548/acrylate-based-materials-for-heart-valve-scaffold-engineering
#5
Rosaria Santoro, Seshasailam Venkateswaran, Francesco Amadeo, Rong Zhang, Maura Brioschi, Anthony Callanan, Marco Agrifoglio, Cristina Banfi, Mark Bradley, Maurizio Pesce
Calcific aortic valve disease (CAVD) is the most frequent cardiac valve pathology. Its standard treatment consists of surgical replacement either with mechanical (metal made) or biological (animal tissue made) valve prostheses, both of which have glaring deficiencies. In the search for novel materials to manufacture artificial valve tissue, we have conducted a high-throughput screening with subsequent up-scaling to identify non-degradable polymer substrates that promote valve interstitial cells (VICs) adherence/growth and, at the same time, prevent their evolution toward a pro-calcific phenotype...
November 17, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29144306/characterization-of-a-hybrid-polyacrylamide-and-its-flocculation-properties-in-cyanide-tailing-suspensions
#6
Ya Liu, Cuicui Lv, Jian Ding, Peng Qian, Yang Yu, Shufeng Ye, Yunfa Chen
An inorganic-organic hybrid flocculant Al(OH)3-polyacrylamide (Al-PAM) with narrow molecular weight distribution was synthesized using inverse microemulsion polymerization. The hybrid polymer Al-PAM was characterized by Infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy and scanning electron microscopy, and it was found that it had a 'star-like' structure in which Al(OH)3 colloidal particles acted as cores linking PAM chains. The properties of Al-PAM were investigated in flocculating 10 wt% cyanide tailing suspensions...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144127/area-controllable-stamping-of-semicrystalline-copolymer-ionogels-for-solid-state-electrolyte-gated-transistors-and-light-emitting-devices
#7
Hyun Je Kim, Hae Min Yang, Jaemok Koo, Moon Sung Kang, Kihyon Hong, Keun Hyung Lee
Two types of thin-film electrochemical devices (electrolyte-gated transistors and electrochemical light-emitting cells) are demonstrated by using area-controllable ionogel patches generated by transfer stamping. For the successful transfer of ionogel patches on various target substrates thermoreversible gelation by phase-separated polymer crystals within the ionogel is essential because it allows the gel to form a conformal contact with the acceptor substrate, and thereby lowering the overall Gibbs energy of the system upon transfer of the ionogel...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144013/photocontrolled-synthesis-of-abiotic-sequence-defined-oligo-phosphodiester-s
#8
Niklas Felix König, Sofia Telitel, Salomé Poyer, Laurence Charles, Jean-François Lutz
A photoregulated phosphoramidite iterative process is studied for the synthesis of non-natural, digitally encoded oligo(phosphodiester)s. The oligomers are prepared using two reactive phosphoramidite monomers containing a 2-(2-nitrophenyl)propoxycarbonyl (NPPOC) protected OH group. The stepwise synthesis is performed on an OH-functional soluble polystyrene support, which allows recycling by precipitation in a nonsolvent. Repeating cycles involving phosphoramidite coupling, oxidation of phosphite to phosphate, and NPPOC deprotection by light irradiation at λ = 365 nm are performed in order to prepare oligomers with different lengths and sequences...
November 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29143830/gramicidin-ion-channels-in-a-lipid-bilayer-supported-on-polyelectrolyte-multilayer-films-an-electrochemical-impedance-study
#9
Eleftheria Diamanti, Eduart Gutiérrez-Pineda, Nikolaos Politakos, Patrizia Andreozzi, María José Rodriguez-Presa, Wolfgang Knoll, Omar Azzaroni, Claudio A Gervasi, Sergio E Moya
Supported membranes on polymer cushions are of fundamental interest as models for cell membranes. The use of polyelectrolyte multilayers (PEMs) assembled by the layer by layer (LbL) technique as supports for a bilayer allows for easy integration of the lipid bilayer on surfaces and devices and for nanoscale tunable spacing of the lipid bilayer. Controlling ionic permeability in lipid bilayers supported on PEMs triggers potential applications in sensing and as models for transport phenomena in cell membranes...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29143770/surface-relief-gratings-in-halogen-bonded-polymer-azobenzene-complexes-a-concentration-dependence-study
#10
Jelle E Stumpel, Marco Saccone, Valentina Dichiarante, Ossi Lehtonen, Matti Virkki, Pierangelo Metrangolo, Arri Priimagi
In recent years, supramolecular complexes comprising a poly(4-vinylpyridine) backbone and azobenzene-based halogen bond donors have emerged as a promising class of materials for the inscription of light-induced surface-relief gratings (SRGs). The studies up to date have focused on building supramolecular hierarchies, i.e., optimizing the polymer-azobenzene noncovalent interaction for efficient surface patterning. They have been conducted using systems with relatively low azobenzene content, and little is known about the concentration dependence of SRG formation in halogen-bonded polymer-azobenzene complexes...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143001/easily-fabricated-and-lightweight-ppy-pda-agnw-composites-for-excellent-electromagnetic-interference-shielding
#11
Yan Wang, Fu-Qiang Gu, Li-Juan Ni, Kun Liang, Kyle Marcus, Shu-Li Liu, Fan Yang, Jin-Ju Chen, Zhe-Sheng Feng
Conductive polymer composites (CPCs) containing nanoscale conductive fillers have been widely studied for their potential use in various applications. In this paper, polypyrrole (PPy)/polydopamine (PDA)/silver nanowire (AgNW) composites with high electromagnetic interference (EMI) shielding performance, good adhesion ability and light weight are successfully fabricated via a simple in situ polymerization method followed by a mixture process. Benefiting from the intrinsic adhesion properties of PDA, the adhesion ability and mechanical properties of the PPy/PDA/AgNW composites are significantly improved...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29141146/the-effect-of-pressure-and-temperature-on-mid-infrared-sensing-of-dissolved-hydrocarbons-in-water
#12
Charles Heath, Matthew B Myers, Bobby Pejcic
Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy using a polymer coated internal reflection element/waveguide is an established sensor platform for the detection of a range of organic and hydrocarbon molecules dissolved in water. The polymer coating serves two purposes: to concentrate hydrocarbons from the aqueous phase and to exclude water along with other interfering molecules from the surface of the internal reflection element. Crucial to reliable quantification and analytical performance is the calibration of the ATR-FTIR sensor which is commonly performed in water under mild ambient conditions (i...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29140605/highly-transparent-and-integrable-surface-texture-change-device-for-localized-tactile-feedback
#13
Ankit, Naveen Tiwari, Mayank Rajput, Nguyen Anh Chien, Nripan Mathews
Human-machine haptic interaction is typically detected by variations in friction, roughness, hardness, and temperature, which combines to create sensation of surface texture change. Most of the current technologies work to simulate changes in tactile perception (via electrostatic, lateral force fields, vibration motors, etc.) without creating actual topographical transformations. This makes it challenging to provide localized feedback. Here, a new concept for on-demand surface texture augmentation that is capable of physically forming local topographic features in any predesigned pattern is demonstrated...
November 15, 2017: Small
https://www.readbyqxmd.com/read/29137766/mild-synthesis-of-a-zn-ii-metal-organic-polymer-and-its-hybrid-with-activated-carbon-application-as-antibacterial-agent-and-in-water-treatment-by-using-sonochemistry-optimization-kinetic-and-isotherm-study
#14
Tahere Taghipour, Gholamreza Karimipour, Mehrorang Ghaedi, Arash Asfaram
In this work, a room temperature and short method (30min) for synthesis of nanosized rod-like metal organic polymer (MOP) has been described. Reaction of 1,4-phenylenedioxy diacetic acid with zinc salt leads to the formation of [Zn(C10H8O6)(H2O)4]n and subsequently was loaded on activated carbon following sonication and structurally characterized by FTIR, SEM, EDX and XRD analysis. The combination of this new composite with sonication was applied for rapid and efficient adsorption of Bromocresol Purple (BCP)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136076/enhancing-the-photostability-of-poly-phenylene-ethynylene-for-single-particle-studies
#15
C F Calver, B A Lago, K S Schanze, G Cosa
Single molecule fluorescence (SMF) studies on conjugated polymers yield enhanced information on exciton dynamics and on the interplay between polymer conformation/morphology and photophysical behavior. SMF studies, however, demand good signal stability, excellent photostability, and high photon yields (a measure of both photostability and brightness) and thus the development of strategies to help conjugated polymers (CPs) meet these requirements is a topic of great interest. Here, we evaluate the effect of a number of triplet quencher additives on the photostability of a 49-mer long poly(phenylene-ethynylene) conjugated polymer bearing carboxylate side groups (PPE-CO2-49) that is deposited onto 100 nm diameter SiO2 nanoparticles (NPs)...
November 14, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29135464/polybenzimidazole-mxene-composite-membranes-for-intermediate-temperature-polymer-electrolyte-membrane-fuel-cells
#16
Mingming Fei, Ruizhi Lin, Yuming Deng, Hongxi Xian, Renji Bian, Xiaole Zhang, Jigui Cheng, Chenxi Xu, Dongyu Cai
This report demonstrated the first study on the use of a new 2D nanomaterial (Mxene) for enhancing membrane performance of intermediate temperature (>100 oC) polymer electrolyte membrane fuel cells (ITPEMFCs). In this study, a typical Ti3C2Tx-MXene was synthesized and incorporated into polybenzimidazole (PBI)-based membranes by using a solution blending method. The composite membrane with 3wt.% Ti3C2Tx-MXene showed the proton conductivity more than 2 times higher than that of pristine PBI membrane at the temperature range of 100-170 ºC, and led to substantial increase in maximum power density of fuel cells by ~ 30% tested at 150 oC...
November 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29135063/conductive-microporous-covalent-triazine-based-framework-for-high-performance-electrochemical-capacitive-energy-storage
#17
Weiqiao Deng, Yajuan Li, Shuanghao Zheng, Xue Liu, Pan Li, Lei Sun, Ruixia Yang, Sen Wang, Zhongshuai Wu, Xinhe Bao
Nitrogen enriched porous nanocarbon, graphene and conductive polymers attracted increasing attention in the application of supercapacitors. However, the electrode material possessing large specific surface area (SSA) and high nitrogen doping concentration simultaneously, which is needed for excellent supercapacitors, has not been achieved thus far. Herein, we developed a class of tetracyanoquinodimethane-derived conductive microporous covalent triazine-based frameworks (marked as TCNQ-CTFs) with high nitrogen content (> 8%) and large SSA (> 3600 m²/g) at the same time...
November 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29131611/synthesis-and-in-vitro-evaluation-of-monodisperse-amino-functional-polyester-dendrimers-with-rapid-degradability-and-antibacterial-properties
#18
Patrik Stenström, Erik Hjort, Yuning Zhang, Oliver C J Andrén, Simon Guette-Marquet, Marianne Schultzberg, Michael Malkoch
Amine functional polymers, especially cationically charged, are interesting biomacromolecules for several reasons including easy cell membrane entrance, their ability to escape endosomes through the proton sponge effect, spontaneous complexation and delivery of drugs and siRNA and simple functionalization in aqueous solutions. Dendrimers, a subclass of precision polymers, are monodisperse and exhibit a large and exact number of peripheral end groups in relation to their size and have shown promise in drug delivery, biomedical imaging and as anti-viral agents...
November 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29131607/carbon-papers-and-aerogels-based-on-graphene-layers-and-chitosan-direct-preparation-from-high-surface-area-graphite
#19
Vincenzina Barbera, Silvia Guerra, Luigi Brambilla, Mario Maggio, Andrea Serafini, Lucia Conzatti, Alessandra Vitale, Maurizio Galimberti
In this work, carbon papers and aerogels based on graphene layers and chitosan were prepared. They were obtained by mixing chitosan (CS) and a high surface area nanosized graphite (HSAG) in water in the presence of acetic acid. HSAG/CS water dispersions were stable for months. High resolution transmission electron microscopy revealed the presence of few graphene layers in water suspensions. Casting or lyophilization of such suspensions led to the preparation of carbon paper and aerogel respectively. In X-ray spectra of both aerogels and carbon paper, peaks due to regular stacks of graphene layers were not detected: graphene with unaltered sp(2) structure was obtained directly from graphite without the use of any chemical reaction...
November 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29131566/a-new-class-of-lagp-based-solid-polymer-composite-electrolyte-for-efficient-and-safe-solid-state-lithium-batteries
#20
Qingpeng Guo, Yu Han, Hui Wang, Shizhao Xiong, Yujie Li, Shuangke Liu, Kai Xie
Inorganic solid electrolytes (SEs) possess substantial safety and electrochemical stability, which make them as key components of the safe rechargeable solid-state Li batteries with high energy density. However, complicated integrally molding process, the poor wettability between SE and active materials are the most challenging barriers for the application of SEs. In this regard, we explore composite SE of the active ceramic Li1+xAlxGe2-x(PO4)3 (LAGP) as the main medium for ion-conducting and the polymer P(VDF-HFP) as matrix...
November 13, 2017: ACS Applied Materials & Interfaces
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