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https://www.readbyqxmd.com/read/29792331/predictable-particle-engineering-programming-the-energy-level-carrier-generation-and-conductivity-of-core-shell-particles
#1
Conghui Yuan, Tong Wu, Jie Mao, Ting Chen, Yuntong Li, Min Li, Yiting Xu, Birong Zeng, Weiang Luo, Lingke Yu, Gaofeng Zheng, Lizong Dai
Core-shell structures are of particular interest in the development of advanced composite materials as they can efficiently bring different components together at nanoscale. The advantage of this structure greatly relies on the crucial design of both core and shell, thus achieving an inter-component synergistic effect. In this report, we show that decorating semiconductor nanocrystals with a boronate polymer shell can easily achieve programmable core-shell interactions. Taking ZnO and anatase TiO2 nanocrystals as inner core examples, the effective core-shell interactions can narrow the band gap of semiconductor nanocrystals, change the HOMO and LUMO levels of boronate polymer shell and significantly improve the carrier density of core-shell particles...
May 24, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29790479/long-term-clinical-outcomes-after-bioresorbable-and-permanent-polymer-drug-eluting-stent-implantation-final-five-year-results-of-the-century-ii-randomised-clinical-trial
#2
William Wijns, Mariano Valdes-Chavarri, Gert Richardt, Raul Moreno, Andrés Íñiguez-Romo, Emanuele Barbato, Didier Carrié, Kenji Ando, Béla Merkely, Ran Kornowski, Hélène Eltchaninoff, Sinisa Stojkovic, Shigeru Saito
AIMS: The aim of this study was to establish the long-term safety and efficacy of a sirolimus-eluting stent with bioresorbable polymer (BP-SES; Ultimaster) by comparison with an everolimus-eluting stent with permanent polymer (PP-EES; XIENCE). METHODS AND RESULTS: CENTURY II (Clinical Evaluation of New Terumo Drug-Eluting Coronary Stent System in the Treatment of Patients with Coronary Artery Disease) is a large-scale, prospective, multicentre, randomised single-blind, controlled, non-inferiority trial conducted at 58 study sites globally, including Europe, Japan and Korea, powered to prove non-inferiority for freedom from target lesion failure (TLF: cardiac death, target vessel-related myocardial infarction [MI] and target lesion revascularisation) at nine months...
May 23, 2018: EuroIntervention
https://www.readbyqxmd.com/read/29789041/effect-of-water-quality-and-temperature-on-the-efficiency-of-two-kinds-of-hydrophilic-polymers-in-soil
#3
Davoud Khodadadi Dehkordi
  In this study, evaluation of two-superabsorbent effects, Super-AB-A-300 and Super-AB-A-200 in a sandy soil on the water retention capability and saturated hydraulic conductivity (Ks) at different water quality and soil temperature were done. The Super-AB-A-200 was less effective in water uptake than Super-AB-A-300. The efficiency of these polymers in water retention was negatively influenced by the water quality and temperature. The efficiency of these polymer treatments in water uptake reduced significantly (P < 0...
June 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29787672/oxidized-nanocarbons-tripeptide-supramolecular-hydrogels-shape-matters
#4
Daniel Iglesias, Manuel Melle-Franco, Marina Kurbasic, Michele Melchionna, Michela Abrami, Mario Grassi, Maurizio Prato, Silvia Marchesan
Short peptide hydrogels are attractive biomaterials but typically suffer from limited mechanical properties. Inclusion of other nanomaterials can serve the dual purpose of hydrogel reinforcement and of conferring additional physico-chemical properties ( e.g., self-healing, conductivity), as long as they do not hamper peptide self-assembly. In particular, nanocarbons are ideal candidates and their physico-chemical properties have demonstrated great potential in nanocarbon-polymer gel biomaterials for tissue engineering or drug delivery...
May 22, 2018: ACS Nano
https://www.readbyqxmd.com/read/29787260/recent-advances-in-biodegradable-conducting-polymers-and-their-biomedical-applications
#5
Kenry, Bin Liu
The growing importance of biodegradable conducting polymers (CPs) have fueled the rapid development of this unique class of polymeric materials in recent years. Possessing both the electrical conductivity approaching those of metallic conductors and the biodegradability of biocompatible polymers, biodegradable CPs are highly sought after. In fact, they have emerged as the ideal biomaterials, having immense potential for augmenting a wide range of practical biomedical applications. Herein, we provide a broad overview of recent advances in the development of biodegradable CPs and their biomedical applications...
May 22, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29787245/structure-and-dynamics-of-a-graphene-melt
#6
Wenjie Xia, Fernando Vargas Lara, Sinan Keten, Jack F Douglas
We explore the structural and dynamic properties of bulk materials composed of graphene nanosheets using coarse-grained molecular dynamics simulations. Remarkably, our results show clear evidence that the bulk graphene materials exhibit fluid-like behaviors similar to linear polymer melts at elevated temperatures and that these materials transform into a glassy-like "foam" state at temperatures below the glass-transition temperature (T_g) of these materials. Distinct from an isolated graphene sheet, which exhibits a relatively flat shape with fluctuations, we find that graphene sheets in a melt state structurally adopt more "crumpled" configurations and correspondingly smaller sizes, as normally found for ordinary polymers in the melt...
May 22, 2018: ACS Nano
https://www.readbyqxmd.com/read/29780993/ideal-reversible-polymer-networks
#7
German Alberto Parada, Xuanhe Zhao
In this article we introduce the concept of ideal reversible polymer networks, which have well-controlled polymer network structures similar to ideal covalent polymer networks but exhibit viscoelastic behaviors due to the presence of reversible crosslinks. We first present a theory to describe the mechanical properties of ideal reversible polymer networks. Because short polymer chains of equal length are used to construct the network, there are no chain entanglements and the chains' Rouse relaxation time is much shorter than the reversible crosslinks' characteristic time...
May 21, 2018: Soft Matter
https://www.readbyqxmd.com/read/29778889/polypyrrole-increases-branching-and-neurite-extension-by-neuro2a-cells-on-pbat-ultrathin-fibers
#8
Alessandro E C Granato, André C Ribeiro, Fernanda R Marciano, Bruno V M Rodrigues, Anderson O Lobo, Marimelia Porcionatto
We present a methodology for production and application of electrospun hybrid materials containing commercial polyester (poly (butylene adipate-co-terephthalate; PBAT), and a conductive polymer (polypirrole; PPy) as scaffold for neuronal growth and differentiation. The physical-chemical properties of the scaffolds and optimization of the electrospinning parameters are presented. The electrospun scaffolds are biocompatible and allow proper adhesion and spread of mesenchymal stem cells (MSCs). Fibers produced with PBAT with or without PPy were used as scaffold for Neuro2a mouse neuroblastoma cells adhesion and differentiation...
May 17, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29777389/iron-based-metal-organic-frameworks-as-a-theranostic-carrier-for-local-tuberculosis-therapy
#9
Gabriela Wyszogrodzka, Przemysław Dorożyński, Barbara Gil, Wieslaw J Roth, Maciej Strzempek, Bartosz Marszałek, Władysław P Węglarz, Elżbieta Menaszek, Weronika Strzempek, Piotr Kulinowski
PURPOSE: The purpose of the study was initial evaluation of applicability of metal organic framework (MOF) Fe-MIL-101-NH2 as a theranostic carrier of antituberculous drug in terms of its functionality, i.e. drug loading, drug dissolution, magnetic resonance imaging (MRI) contrast and cytotoxic safety. METHODS: Fe-MIL-101-NH2 was characterized using X-ray powder diffraction, FTIR spectrometry and scanning electron microscopy. The particle size analysis was determined using laser diffraction...
May 18, 2018: Pharmaceutical Research
https://www.readbyqxmd.com/read/29775852/biomimetic-magnetoelectric-nanocrystals-synthesized-by-polymerization-of-heme-as-advanced-nanomaterials-for-biosensing-application
#10
Jeong Eun Hyeon, Da Woon Jeong, Young Jin Ko, Seung Wook Kim, Chulhwan Park, Sung Ok Han
Regardless of the malaria disease risk, the malaria parasite Plasmodium falciparum has an interesting mechanism. During its growth within the red blood cell, toxic free heme is converted into an insoluble crystalline form called the malaria pigment, or hemozoin. In particular, natural hemozoin nanocrystals can provide multiple applications in biosensing fields for health care and diagnosis as similar to artificial metal nanoparticles. In this study, the heme was biologically synthesized and polymerized by Corynebacterium glutamicum and final polymer was applied as a biomimetic conductive biopolymer...
May 10, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775438/breakdown-of-water-super-permeation-in-electrically-insulating-graphene-oxide-films-role-of-dual-interlayer-spacing
#11
M K Kavitha, Tushar Sakorikar, Pramitha V, Manu Jaiswal
Conventional graphene oxide is characterized by low sp&lt;sup&gt;2&lt;/sup&gt; content in a sp&lt;sup&gt;3&lt;/sup&gt; rich matrix, which is responsible both for electrical insulation and water super-permeation. Upon reduction, electrical conduction is achieved at the expense of water permeation ability. Here, we demonstrate that charge conduction and water permeation can be simultaneously restricted in a functionalized form of graphene oxide. Gravimetric studies reveal that diffusion of water vapour through glassy polymer membranes is arrested by loading hydrophobic form of GO in the polymer matrix, even as such water inhibition cannot be realized by substantially increasing the thickness of the bare polymer...
May 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29773749/co-2-electroreduction-to-ethylene-via-hydroxide-mediated-copper-catalysis-at-an-abrupt-interface
#12
Cao-Thang Dinh, Thomas Burdyny, Md Golam Kibria, Ali Seifitokaldani, Christine M Gabardo, F Pelayo García de Arquer, Amirreza Kiani, Jonathan P Edwards, Phil De Luna, Oleksandr S Bushuyev, Chengqin Zou, Rafael Quintero-Bermudez, Yuanjie Pang, David Sinton, Edward H Sargent
Carbon dioxide (CO2 ) electroreduction could provide a useful source of ethylene, but low conversion efficiency, low production rates, and low catalyst stability limit current systems. Here we report that a copper electrocatalyst at an abrupt reaction interface in an alkaline electrolyte reduces CO2 to ethylene with 70% faradaic efficiency at a potential of -0.55 volts versus a reversible hydrogen electrode (RHE). Hydroxide ions on or near the copper surface lower the CO2 reduction and carbon monoxide (CO)-CO coupling activation energy barriers; as a result, onset of ethylene evolution at -0...
May 18, 2018: Science
https://www.readbyqxmd.com/read/29772662/high-performance-of-supercapacitor-from-pedot-pss-electrode-and-redox-iodide-ion-electrolyte
#13
Xing Gao, Lei Zu, Xiaomin Cai, Ce Li, Huiqin Lian, Yang Liu, Xiaodong Wang, Xiuguo Cui
Insufficient energy density and poor cyclic stability is still challenge for conductive polymer-based supercapacitor. Herein, high performance electrochemical system has been assembled by combining poly (3,4-ethylenedioxythiophene) (PEDOT):poly (styrene sulfonate) (PSS) redox electrode and potassium iodide redox electrolyte, which provide the maximum specific capacity of 51.3 mAh/g and the retention of specific capacity of 87.6% after 3000 cycles due to the synergic effect through a simultaneous redox reaction both in electrode and electrolyte, as well as the catalytic activity for reduction of triiodide of the PEDOT:PSS...
May 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29772283/amphiphilic-polyurethane-hydrogels-as-smart-carriers-for-acidic-hydrophobic-drugs
#14
Lucas P Fonseca, Rafael B Trinca, Maria Isabel Felisberti
Amphiphilic hydrogels are widely reported as systems with great potential for controlled drug release. Nevertheless, the majority of studies make use of functionalization or attachment of drugs to the polymer chains. In this study, we propose a strategy of combining amphiphilic polyurethanes with pH-responsive drugs to develop smart drug carriers. While the amphiphilic character of the polymer imparts an efficient load of hydrophobic and hydrophilic drugs, the drug's characteristics determine the selectivity of the medium delivery...
May 14, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29769651/a-pulse-biasing-small-signal-measurement-technique-enabling-40-mhz-operation-of-vertical-organic-transistors
#15
Bahman Kheradmand-Boroujeni, Markus P Klinger, Axel Fischer, Hans Kleemann, Karl Leo, Frank Ellinger
Organic/polymer transistors can enable the fabrication of large-area flexible circuits. However, these devices are inherently temperature sensitive due to the strong temperature dependence of charge carrier mobility, suffer from low thermal conductivity of plastic substrates, and are slow due to the low mobility and long channel length (L). Here we report a new, advanced characterization circuit that within around ten microseconds simultaneously applies an accurate large-signal pulse bias and a small-signal sinusoidal excitation to the transistor and measures many high-frequency parameters...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29769569/electrically-and-thermally-conductive-carbon-fibre-fabric-reinforced-polymer-composites-based-on-nanocarbons-and-an-in-situ-polymerizable-cyclic-oligoester
#16
Ji-Un Jang, Hyeong Cheol Park, Hun Su Lee, Myung-Seob Khil, Seong Yun Kim
There is growing interest in carbon fibre fabric reinforced polymer (CFRP) composites based on a thermoplastic matrix, which is easy to rapidly produce, repair or recycle. To expand the applications of thermoplastic CFRP composites, we propose a process for fabricating conductive CFRP composites with improved electrical and thermal conductivities using an in-situ polymerizable and thermoplastic cyclic butylene terephthalate oligomer matrix, which can induce good impregnation of carbon fibres and a high dispersion of nanocarbon fillers...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29768833/effect-of-dispersoid-on-sulfonium-ionic-liquid-based-gel-polymer-electrolyte-for-lithium-secondary-battery
#17
R Muthupradeepa, M Sivakumar, R Subadevi, V Suryanarayanan, Wei-Ren Liu
The present study emphases on the effect of toting of TiO2 filler on the electrochemical enactment of polymer electrolyte containing PVdF-co-HFP(30) + SEt3TFSI(10) + EC/PC(60) + TiO2(x) wt% (Poly (vinylidene fluoride-co-hexafluoropropylene + Triethylsulfoniumbis(trifluoromethylsulfonyl)imide + Ethylene carbonate/Propylene carbonate (1:1 ratio) + Titanium dioxide) for lithium battery applications. Composite electrolytes with different weight percentages of TiO2 were prepared and characterized by different surface analytical, thermal and electrochemical techniques...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29767830/effect-of-homeopathic-dilutions-of-cuprum-arsenicosum-on-the-electrical-properties-of-poly-vinylidene-fluoride-co-hexafluoropropylene
#18
Anandalal Gayen, Dheeraj Mondal, Poonam Bandyopadhyay, Debbethi Bera, Durga Sankar Bhar, Sukhen Das, Raj Kumar Manchanda, Anil Kumar Khurana, Debadatta Nayak, Biplab Kumar Paul, Papiya Nandy
BACKGROUND:  We report the effects of nanoparticles in homeopathic preparations of copper salts on the electrical properties of polymer film. Previous work showed that the incorporation of metal-derived homeopathic medicines increases the dielectric constant and alternating current (AC) conductivity of an electroactive polymer film that is commonly used as a capacitor in the electronic industry.We report here the effect of dilution of one homeopathic medicine, Cuprum arsenicosum ( CuAs ), at 200C potency on the electrical properties of the polymer film of poly(vinylidene fluoride-co-hexafluoropropylene)...
May 2018: Homeopathy: the Journal of the Faculty of Homeopathy
https://www.readbyqxmd.com/read/29767207/electrochemical-polymerization-of-pyrene-and-aniline-exclusively-inside-the-pores-of-activated-carbon-for-high-performance-asymmetric-electrochemical-capacitors
#19
Hiroyuki Itoi, Shintaro Maki, Takeru Ninomiya, Hideyuki Hasegawa, Hidenori Matsufusa, Shinya Hayashi, Hiroyuki Iwata, Yoshimi Ohzawa
An asymmetric polymer capacitor was prepared from pyrene (PY), aniline (ANI), and commercially available activated carbon (AC) through a solvent-free preparation. PY and ANI were adsorbed into the AC host material in the gas phase and electrochemically polymerized exclusively inside the AC pores in an aqueous H2SO4 electrolyte (1 M). No volumetric expansion of the AC particles occurred upon the adsorption of monomers and their subsequent polymerizations; thus, the volumetric capacitance was enhanced by the inclusion of pseudocapacitive polypyrene (PPY) and polyaniline (PANI)...
May 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29767192/ultra-low-voltage-triggered-release-of-an-anti-cancer-drug-from-polypyrrole-nanoparticles
#20
Devleena Samanta, Niloufar Hosseini-Nassab, Aidan D McCarty, Richard N Zare
We have synthesized polypyrrole nanoparticles using three different oxidizing agents (hydrogen peroxide, chloroauric acid and ferric chloride) and shown that films assembled from these nanoparticles have significantly different drug release profiles. When ferric chloride is used as the oxidizing agent, it is possible to release drugs at voltages as low as -0.05 V, almost an order of magnitude lower than typically used voltages. These ultra-low voltage responsive nanoparticles widen the window of operation of conducting polymers and enable delivery of redox active drugs...
May 16, 2018: Nanoscale
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