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https://www.readbyqxmd.com/read/28934696/synthesis-and-application-of-a-plastic-antibody-in-electrochemical-microfluidic-platform-for-oxytocin-determination
#1
Piyush Sindhu Sharma, Zofia Iskierko, Krzysztof Noworyta, Maciej Cieplak, Pawel Borowicz, Wojciech Lisowski, Francis D'Souza, Wlodzimierz Kutner
By means of molecular imprinting of a conducting polymer, molecular cavities selective for oxytocin nonapeptide, an autism biomarker, were designed. Embedding of the oxytocin template, and then its extracting from the molecularly imprinted polymer (MIP) was confirmed by the XPS analysis. AFM imaging of the MIP film surface indicated changes in mechanical properties of the film after template extraction. The MIP synthetic receptor was deposited by potentiodynamic electropolymerization as a thin film on an Au film electrode in an electrochemical miniaturized microfluidic cell...
September 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28933863/chemical-vapor-deposition-of-thin-conductive-and-fouling-resistant-polymeric-films
#2
Minghui Wang, Peter Kovacik, Karen K Gleason
Fouling has been a persistent issue within applications ranging from membrane separation to biomedical implantation. Research to date focuses on fouling resistant coatings, where electrical conductivity is unnecessary. In this study, we report the synthesis of multifunctional thin films with both fouling-resistance and electrical conductivity for their potential applications in electrolysis based self-cleaning of separation membranes and in the field of bioelectronics. This unique combination of properties results in multifunctional coatings that are a zwitterionic derivative of the intrinsically conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) synthesized via oxidative chemical vapor deposition (oCVD)...
September 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28933756/a-disposable-amperometric-sensor-based-on-high-performance-pedot-pss-ionic-liquid-nanocomposite-thin-film-modified-screen-printed-electrode-for-the-analysis-of-catechol-in-natural-water-samples
#3
Francis D Krampa, Yaw Aniweh, Gordon A Awandare, Prosper Kanyong
A conducting polymer-based composite material of poly(3,4-ethylenedioxythiophene) (PEDOT): poly(4-styrenesulfonate) (PSS) doped with different percentages of a room temperature ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]), was prepared and a very small amount of the composite (2.0 µL) was drop-coated on the working area of a screen-printed carbon electrode (SPCE). The SPCE, modified with PEDOT:PSS/IL composite thin-film, was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), profilometry and sessile contact angle measurements...
July 26, 2017: Sensors
https://www.readbyqxmd.com/read/28932050/evaluation-of-paxillin-expression-in-patients-with-oral-squamous-cell-carcinoma-an-immunohistochemical-study
#4
Saurabh Shekhar, Punnya V Angadi
BACKGROUND: Oral squamous cell carcinoma (OSCC) is the tenth most common cancer in the world. The diagnosis of OSCC remains problematic, especially in advanced-stage tumors. AIMS: The present study was conducted to understand the pattern of expression of paxillin in varying grades of carcinomas and also to ascertain whether its expression has an association with increasing grades. METHODS: A total of ninety formalin-fixed paraffin-embedded tissues of OSCC were included in the study comprising thirty cases of each of well-differentiated squamous cell carcinomas, moderately differentiated squamous cell carcinomas (MDSCCs) and poorly differentiated squamous cell carcinomas (PDSCCs)...
May 2017: Journal of Oral and Maxillofacial Pathology: JOMFP
https://www.readbyqxmd.com/read/28931866/ion-channel-aligned-gas-blocking-membrane-for-lithium-air-batteries
#5
Wonsung Choi, Mokwon Kim, Jung Ock Park, Joon-Hee Kim, Kyunghwan Choi, Yong Su Kim, Tae Young Kim, Ken Ogata, Dongmin Im, Seok-Gwang Doo, Yunil Hwang
Lithium-metal-based batteries, owing to the extremely high specific energy, have been attracting intense interests as post-Li-ion batteries. However, their main drawback is that consumption/de-activation of lithium metal can be accelerated when O2 or S used in the cathode crosses over to the metal, reducing the lifetime of the batteries. In use of ceramic solid state electrolyte (SSE) separator, despite the capability of gas blocking, thick and heavy plates (~0.3 mm) are necessitated to compensate its mechanical fragility, which ruin the high specific energy of the batteries...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28930634/solvent-effect-on-diffusion-of-unentangled-linear-polymer-melts
#6
Binghui Deng, Liping Huang, Yunfeng Shi
We conducted molecular dynamics (MD) simulations to study how solvent chains affect the diffusion of linear polymers in the unentangled regime. For monodisperse solvent chains, the self-diffusivity of tagged chain scales with its chain length. The solvent chain length affects both the prefactor and the exponent, the latter of which ranges from -0.79 to -0.85. The scaling exponent here deviates from -1 predicted by the Rouse model, which may suggest that the friction coefficient increases with the solvent chain length...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930452/electrowetting-on-immersed-conducting-hydrogel
#7
Caroline Duc, Alexis Vlandas, George G Malliaras, Vincent Senez
Conducting polymers demonstrate an interesting ability to change their wettability at ultra-low voltage (<1V). While the conducting hydrogel poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is increasingly used as an interface with biology partly thanks to its mechanical properties, little is known about the electrical control of its wettability. We rely on the captive bubble technique to study this hydrogel property in relevant conditions (fully immerged) We here report that the wettability variations of PEDOT:PSS are driven by an electrowetting phenomenon in contrast to other conducting polymers which are thought to undergo wettability changes due to oxido-reduction reactions...
September 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28930433/high-resolution-graphene-films-for-electrochemical-sensing-via-inkjet-maskless-lithography
#8
John A Hondred, Loreen R Stromberg, Curtis L Mosher, Jonathan C Claussen
Solution-phase printing of nanomaterial-based graphene inks are rapidly gaining interest for fabrication of flexible electronics. However, scalable manufacturing techniques for high-resolution printed graphene circuits are still lacking. Here, we report a patterning technique [i.e., inkjet maskless lithography (IML)] to form high resolution, flexible, graphene films (line widths down to 20 µm) that significantly exceeds the current inkjet printing resolution of graphene (line widths ~ 60 µm). IML uses an inkjet printed polymer lacquer as a sacrificial pattern, viscous spin coated graphene, and a subsequent graphene lift-off to patterned films without the need for pre-fabricated stencils, templates or cleanroom technology (e...
September 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28929733/energy-level-alignment-of-n-doping-fullerenes-and-fullerene-derivatives-using-air-stable-dopant
#9
Qinye Bao, Xianjie Liu, Slawomir Braun, Yanqing Li, Jian-Xin Tang, Chun-Gang Duan, Mats Fahlman
Doping has been proved to be one of the powerful technologies to achieve significant improvement in organic electronic device performance. Herein, we systematically map out the interface properties of solution processed air stable n-type 4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl (DMBI) doping fullerenes and fullerene derivatives, and establish an universal energy level alignment scheme for this class of n-doped system. At low doping levels where the charge transfer doping induces mainly bound charges, the energy level alignment of the n-doping organic semiconductor can be described by combining integer charger transfer (ICT)-induced shifts with a so-called double dipole step...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929732/highly-durable-self-standing-solid-state-supercapacitor-based-on-an-ionic-liquid-rich-ionogel-and-porous-carbon-nanofiber-electrodes
#10
Silas K Simotwo, Parameswara Rao Chinnam, Stephanie L Wunder, Vibha Kalra
A high-performance, self-standing solid-state supercapacitor is prepared by incorporating an ionic liquid (IL)-rich ionogel made with 95 wt % IL (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) and 5 wt % methyl cellulose, a polymer matrix, into highly interconnected 3-D activated carbon nanofiber (CNF) electrodes. The ionogel exhibits strong mechanical properties with a storage modulus of 5 MPa and a high ionic conductivity of 5.7 mS cm(-1) at 25 °C. The high-surface-area CNF-based electrode (2282 m(2) g(-1)), obtained via an electrospinning technique, exhibits hierarchical porosity generated both in situ during pyrolysis and ex situ via KOH activation...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929154/electrically-and-thermally-conductive-underwater-acoustically-absorptive-graphene-rubber-nanocomposites-for-multifunctional-applications
#11
Ying Li, Fan Xu, Zaishan Lin, Xianxian Sun, Qingyu Peng, Ye Yuan, Shasha Wang, Zhiyu Yang, Xiaodong He, Yibin Li
Graphene is ideal filler in nanocomposites due to its unique mechanical, electrical and thermal properties. However, it is challenging to uniformly distribute the large fraction of graphene fillers into a polymer matrix because graphene is not easily functionalized. We report a novel method to introduce a large fraction of graphene into a styrene-butadiene rubber (SBR) matrix. The obtained graphene/rubber nanocomposites were mechanically enhanced, acoustically absorptive under water, and electrically and thermally conductive...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28928477/a-generic-method-to-synthesise-graphitic-carbon-coated-nanoparticles-in-large-scale-and-their-derivative-polymer-nanocomposites
#12
Nannan Wang, Zhuxian Yang, Fang Xu, Kunyapat Thummavichai, Hongmei Chen, Yongde Xia, Yanqiu Zhu
A versatile Rotary Chemical Vapour Deposition (RCVD) technique for the in-situ synthesis of large scale carbon-coated non-magnetic metal oxide nanoparticles (NPs) is presented, and a controllable coating thickness varying between 1-5 nm has been achieved. The technique has significantly up-scaled the traditional chemical vapour deposition (CVD) production for NPs from mg level to 10 s of grams per batch, with the potential for continuous manufacturing. The resulting smooth and uniform C-coatings sheathing the inner core metal oxide NPs are made of well-crystallised graphitic layers, as confirmed by electron microscopy imaging, electron dispersive spectrum elemental line scan, X-ray powder diffractions and Raman spectroscopy...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28926256/conductivity-relaxation-relations-in-nanocomposite-polymer-electrolytes-containing-ionic-liquid
#13
Mansoureh Shojaatalhosseini, Khalid Elamin, Jan Swenson
In this study we have used nonocomposite polymer electrolytes, consisting of poly(ethylene oxide) (PEO), δ-Al2O3 nanoparticles and lithium bis(trifluoromethanesolfonyl)imide (LiTFSI) salt (with 4 wt% δ-Al2O3 and PEO:Li ratios of 16:1 and 8:1), and added different amounts of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesolfonyl)imide (BMITFSI). The aim was to elucidate whether the ionic liquid is able to dissociate the Li-ions from the ether oxygens and thereby decouple the ionic conductivity from the segmental polymer dynamics...
September 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28926228/facile-synthesis-of-unique-cellulose-triacetate-based-flexible-and-high-performance-gel-polymer-electrolyte-for-lithium-ion-batteries
#14
Trupti Nirmale, Indrapal Karbhal, Ramchandra S Kalubarme, Manjusha V Shelke, Anjani J Varma, Bharat Bhanudas Kale
Lithium ion batteries (LIBs) with polymer based electrolytes have attracted huge attention due to the possibility of fabricating intrinsically safer and flexible devices. However, economical and eco-friendly sustainable technology is an oncoming challenge to fulfill the ever increasing demand. To circumvent this issue, we have developed gel polymer electrolyte (GPE) based on renewable polymers like cellulose triacetate (CTA) and poly (polyethylene glycol methacrylate) p(PEGMA) by using a photo polymerization technique...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28926062/selectivity-of-solid-phase-extraction-for-dissolved-organic-matter-in-the-hypersaline%C3%A2-da-qaidam-lake-china
#15
Keli Yang, Yaoling Zhang, Yaping Dong, Wu Li
Dissolved organic matter (DOM) was isolated from the hypersaline Da Qaidam Lake using solid-phase extraction (SPE) methods with five different adsorbents: ENVI-Carb (non-porous graphitized carbon), HLB, PPL, and XAD-8 (polymer based), and ENVI-18 (silica based). Structure-selective assessments of SPE-DOM isolated using the different adsorbents were conducted using a combination of complementary analysis techniques, including dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) analysis, as well as elemental analysis, Fourier transformed infrared spectroscopy (FTIR), (1)H nuclear magnetic resonance ((1)H NMR) and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS)...
September 19, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28925265/janus-electrochemistry-asymmetric-functionalization-in-one-step
#16
David Ibañez, Elisa Vallés, Elvira Gómez, Alvaro Colina, Aranzazu Heras
Janus structures represent an overwhelming member of materials with adaptable chemical and physical properties. The development of new synthesis routes has allowed the fabrication of Janus architectures with specific characteristics depending on the final applications. In the case of the membranes, the improvement of wet routes has been limited to the capillary effect, in which the solution can gradually penetrate through the membrane avoiding a double modification, different at each face of the membrane. In this work, we propose a new electrochemical methodology to circumvent the capillary limitation and to obtain a double electrochemical functionalization in only one step in a controlled way...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28923769/reconstitutable-spray-dried-ultra-fine-dispersion-as-a-robust-platform-for-effective-oral-delivery-of-an-antihyperlipidemic-drug
#17
Mona Basha, Alaa H Salama, Sally El Awdan
The current article highlights the application of spray drying technique to produce an ultra-fine powder encapsulating the antihyperlipidemic drug, atorvastatin calcium (ATV). First, ATV was dissolved in an emulsion formulation, and different carriers (pectin, alginate, chitosan HCl and hydroxypropylmethyl cellulose) in two concentrations (1.5 and 3%) were added. Then, these carrier-containing formulations were subjected to spray drying, whereby ultra-fine ATV-loaded spray dried emulsions were produced (ATV-SDE)...
September 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28923606/actinomycetes-benefaction-role-in-soil-and-plant-health
#18
REVIEW
Asma Absar Bhatti, Shamsul Haq, Rouf Ahmad Bhat
Actinomycetes are aerobic, spore forming gram-positive bacteria, belonging to the order actinomycetales characterized with substrate and aerial mycelium growth. They are the most abundant organisms that form thread-like filaments in the soil and are responsible for characteristically "earthy" smell of freshly turned healthy soil. They play major roles in the cycling of organic matter; inhibit the growth of several plant pathogens in the rhizosphere and decompose complex mixtures of polymer in dead plant, animal and fungal material results in production of many extracellular enzymes which are conductive to crop production...
September 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28922486/conducting-polymer-based-materials-for-electrochemical-energy-conversion-and-storage
#19
REVIEW
Jianfeng Wang, Jinrong Wang, Zhuang Kong, Kuilin Lv, Chao Teng, Ying Zhu
To alleviate the current energy crisis and environmental pollution, sustainable and ecofriendly energy conversion and storage systems are urgently needed. Due to their high conductivity, promising catalytic activity, and excellent electrochemical properties, conducting polymers have been attracting intense attention for use in electrochemical energy conversion and storage. Here, the latest advances regarding the utilization of conducting polymers for fuel cells and supercapacitors are introduced. The strategies employed to improve the electrocatalytic and electrochemical performances of conducting-polymer-based materials are presented...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28920429/hybrid-mos2-h-bn-nanofillers-as-synergic-heat-dissipation-and-reinforcement-additives-in-epoxy-nanocomposites
#20
Helio Ribeiro, João Paulo Campos Trigueiro, Wellington M Silva, Cristiano F Woellner, Peter Samora Owuor, Alin Cristian Chipara, Magnovaldo Carvalho Lopes, Chandra Sekhar Tiwary, Jairo José Pedrotti, Rodrigo Villegas Salvatierra, James M Tour, Nitin Chopra, Ihab N Odeh, Glaura Silva, Pulickel M Ajayan
Two-dimensional (2D) nanomaterials as molybdenum disulfide (MoS2), hexagonal boron nitride (h-BN), and the hybrid (MoS2/h-BN) were employed as fillers to improve the physical properties of epoxy composites. Nanocomposites were produced in different concentrations and studied in their microstructure, mechanical and thermal properties. The hybrid 2D mixture imparted efficient reinforcement to the epoxy leading to increases of up to 95% in tensile strength, 60% in ultimate strain and 58% in Young's modulus. Moreover, an enhancement of 203% in thermal conductivity was achieved for the hybrid composite as compared to neat polymer...
September 18, 2017: ACS Applied Materials & Interfaces
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