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https://www.readbyqxmd.com/read/28449543/nanoporous-cyanate-ester-resins-structure-gas-transport-property-relationships
#1
Kristina Gusakova, Alexander Fainleib, Eliane Espuche, Olga Grigoryeva, Olga Starostenko, Fabrice Gouanve, Gisèle Boiteux, Jean-Marc Saiter, Daniel Grande
This contribution addresses the relationships between the structure and gas transport properties of nanoporous thermostable cyanate ester resins (CERs) derived from polycyclotrimerization of 1,1'-bis(4-cyanatophenyl)ethane in the presence of 30 or 50 wt% of inert high-boiling temperature porogens (i.e., dimethyl- or dibutyl phthalates), followed by their quantitative removal. The nanopores in the films obtained were generated via a chemically induced phase separation route with further porogen extraction from the densely crosslinked CERs...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28447221/deleterious-abca7-mutations-and-transcript-rescue-mechanisms-in-early-onset-alzheimer-s-disease
#2
Arne De Roeck, Tobi Van den Bossche, Julie van der Zee, Jan Verheijen, Wouter De Coster, Jasper Van Dongen, Lubina Dillen, Yalda Baradaran-Heravi, Bavo Heeman, Raquel Sanchez-Valle, Albert Lladó, Benedetta Nacmias, Sandro Sorbi, Ellen Gelpi, Oriol Grau-Rivera, Estrella Gómez-Tortosa, Pau Pastor, Sara Ortega-Cubero, Maria A Pastor, Caroline Graff, Håkan Thonberg, Luisa Benussi, Roberta Ghidoni, Giuliano Binetti, Alexandre de Mendonça, Madalena Martins, Barbara Borroni, Alessandro Padovani, Maria Rosário Almeida, Isabel Santana, Janine Diehl-Schmid, Panagiotis Alexopoulos, Jordi Clarimon, Alberto Lleó, Juan Fortea, Magda Tsolaki, Maria Koutroumani, Radoslav Matěj, Zdenek Rohan, Peter De Deyn, Sebastiaan Engelborghs, Patrick Cras, Christine Van Broeckhoven, Kristel Sleegers
Premature termination codon (PTC) mutations in the ATP-Binding Cassette, Sub-Family A, Member 7 gene (ABCA7) have recently been identified as intermediate-to-high penetrant risk factor for late-onset Alzheimer's disease (LOAD). High variability, however, is observed in downstream ABCA7 mRNA and protein expression, disease penetrance, and onset age, indicative of unknown modifying factors. Here, we investigated the prevalence and disease penetrance of ABCA7 PTC mutations in a large early onset AD (EOAD)-control cohort, and examined the effect on transcript level with comprehensive third-generation long-read sequencing...
April 27, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28443917/hydrogen-purification-performance-of-a-nanoporous-hexagonal-boron-nitride-membrane-molecular-dynamics-and-first-principle-simulations
#3
Masoud Darvish Ganji, Razieh Dodangeh
Membranes have attracted much attention for the efficient separation of gas mixtures, due to their specific structural and unique properties. In this work, density functional theory (DFT) and molecular dynamic (MD) simulations have been employed to evaluate the performance of nanoporous hexagonal boron nitride (h-BN) monolayers for hydrogen purification. Various porous membranes were designed, and full structural relaxation was carried out by using DFT calculations and then MD simulations to investigate the H2 purification performance of the nanoporous h-BN membranes...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28441616/core-shell-hierarchical-mesostructured-silica-nanoparticles-for-gene-chemo-synergetic-stepwise-therapy-of-multidrug-resistant-cancer
#4
Lijun Sun, Dangge Wang, Yu Chen, Liying Wang, Ping Huang, Yaping Li, Ziwei Liu, Heliang Yao, Jianlin Shi
The design and synthesis of hierarchically nanoporous structures for the co-encapsulation and sequential releases of different cargos are still great challenges in biomedical applications. In this work, we report on the elaborate design and controlled synthesis of a unique core-shell hierarchical mesoporous silica/organosilica nanosystem, in which there are large and small mesopores separately present in the shell and core, facilitating the independent encapsulations of large (siRNA) and small (doxorubicin) molecules, respectively...
April 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28441033/surface-enhanced-raman-scattering-sers-active-gold-nanoparticles-decorated-on-a-porous-polymer-filter
#5
Lei Chen, Huiying Yan, Xiangxin Xue, Dayu Jiang, Yuxi Cai, Dongmei Liang, Young Mee Jung, Xiao Xia Han, Bing Zhao
In this work, we designed a process to assemble gold nanoparticles onto a three-dimensional (3D) polymer surface, which can then be monitored using surface-enhanced Raman scattering (SERS). This work is the first demonstration of the assembly of gold nanoparticles on a filter film and in situ measurement with Raman spectroscopy. Herein, a polyhexamethylene adipamide (Nylon66) film embedded in the organic filter film was used as a template to fabricate a tunable SERS-active substrate. A "hotspot"-rich gold-nanoparticle-decorated polymer substrate for SERS was prepared; this substrate exhibited high sensitivity in trace detection of targets...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28440788/multi-layered-hierarchical-nanostructures-for-transparent-monolithic-dye-sensitized-solar-cell-architectures
#6
Luca Passoni, Francesco Fumagalli, Andrea Perego, Sebastiano Bellani, Piero Mazzolini, Fabio di Fonzo
Monolithic dye sensitized solar cell architectures hold great potential for building integrated photovoltaics applications. They indeed benefit from lower weight and manufacturing costs as they avoid the use of a transparent conductive oxide coated glass counter electrode. In this work a transparent monolithic dye-sensitized solar cell comprising hierarchical 1D nanostructures stack is fabricated by physical vapour deposition techniques. The proof of concept device comprises hyperbranched TiO<sub>2 </sub> nanostructures, sensitized by the prototypical N719, as photoanode, a hierarchical nanoporous Al<sub>2 </sub>O<sub>3 </sub> spacer and a microporous ITO top electrode...
April 25, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28440281/short-channel-effects-on-electrokinetic-energy-conversion-in-solid-state-nanopores
#7
Yan Zhang, Yuhui He, Makusu Tsutsui, Xiang Shui Miao, Masateru Taniguchi
The ion selectivity of nanopores due to the wall surface charges is capable of inducing strong coupling between fluidic and ionic motion within the system. This interaction opens up the prospect of operating nanopores as nanoscale devices for electrokinetic energy conversion. However, the very short channel lengths make the ionic movement and fluidics inside the pore to be substantially affected by the ion depletion/accumulation around the pore ends. Based on three-dimensional electrokinetic modeling and simulation, we present a systematic theoretical study of nanopore electrical resistance, fluidic impedance, and streaming conductance...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440003/advanced-sers-sensor-based-on-capillarity-assisted-preconcentration-through-gold-nanoparticle-decorated-porous-nanorods
#8
Longjian Xue, Wei Xie, Leonie Driessen, Katrin F Domke, Yong Wang, Sebastian Schlücker, Stanislav N Gorb, Martin Steinhart
A preconcentrating surface-enhanced Raman scattering (SERS) sensor for the analysis of liquid-soaked tissue, tiny liquid droplets and thin liquid films without the necessity to collect the analyte is reported. The SERS sensor is based on a block-copolymer membrane containing a spongy-continuous pore system. The sensor's upper side is an array of porous nanorods having tips functionalized with Au nanoparticles. Capillarity in combination with directional evaporation drives the analyte solution in contact with the flat yet nanoporous underside of the SERS sensor through the continuous nanopore system toward the nanorod tips where non-volatile components of the analyte solution precipitate at the Au nanoparticles...
April 25, 2017: Small
https://www.readbyqxmd.com/read/28437079/hierarchical-porous-polybenzimidazole-microsieves-an-efficient-architecture-for-anhydrous-proton-transport-via-polyionic-liquids
#9
Parashuram Kallem, Martin Drobek, Anne Julbe, Erik J Vriezekolk, Reyes Mallada, Maria Pilar Pina
Liquid-induced phase-separation micromolding (LIPSμM) has been successfully used for manufacturing hierarchical porous polybenzimidazole (HPBI) microsieves (42-46% porosity, 30-40 μm thick) with a specific pore architecture (pattern of macropores: ∼9 μm in size, perforated, dispersed in a porous matrix with a 50-100 nm pore size). Using these microsieves, proton-exchange membranes were fabricated by the infiltration of a 1H-3-vinylimidazolium bis(trifluoromethanesulfonyl)imide liquid and divinylbenzene (as a cross-linker), followed by in situ UV polymerization...
April 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28436604/solvent-free-mechanochemical-synthesis-of-nitrogen-doped-nanoporous-carbon-for-electrochemical-energy-storage
#10
Christina Schneidermann, Nicolas Jaeckel, Steffen Oswald, Lars Giebeler, Volker Presser, Lars Borchardt
Nitrogen-doped nanoporous carbons have been synthesized by a solvent-free mechanochemically-induced one-pot synthesis. This facile approach involves the mechanochemical treatment and carbonization of three solid materials: potassium carbonate, urea, and lignin, which is a waste product from pulp industry. The resulting nitrogen-doped porous carbons offer a very high specific surface area up to 3000 m2 g-1 and large pore volume up to 2 cm3 g-1. The mechanochemical reaction and the impact of activation and functionalization are investigated by nitrogen- and water physisorption and high-resolution X-ray photoelectron spectroscopy (XPS)...
April 24, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28436499/white-light-emission-with-tuneable-colour-temperature-and-high-colour-rendering-index-from-cds-si-multi-interface-nanoheterojunctions
#11
Yong Li, Yue Li Song, Peng Fei Ji, Feng Qun Zhou
CdS/Si multi-interface nanoheterojunctions (CdS/Si-NPA) were fabricated by depositing CdS nanocrystallites (nc-CdS) on silicon nanoporous pillar arrays (Si-NPA) by chemical bath deposition. White electroluminescence (EL) with a high colour rendering index from a prototypical light emitting diode based on CdS/Si-NPA has been reported, which does not need complex colour mixing or conversion techniques. The white EL can be composed into three primary colours, which include blue emissions from the Si-NPA, the green emissions from the bandgap emission of nc-CdS and red emissions from the defects in the nc-CdS...
April 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28435877/design-and-function-of-biomimetic-multilayer-water-purification-membranes
#12
Shengjie Ling, Zhao Qin, Wenwen Huang, Sufeng Cao, David L Kaplan, Markus J Buehler
Multilayer architectures in water purification membranes enable increased water throughput, high filter efficiency, and high molecular loading capacity. However, the preparation of membranes with well-organized multilayer structures, starting from the nanoscale to maximize filtration efficiency, remains a challenge. We report a complete strategy to fully realize a novel biomaterial-based multilayer nanoporous membrane via the integration of computational simulation and experimental fabrication. Our comparative computational simulations, based on coarse-grained models of protein nanofibrils and mineral plates, reveal that the multilayer structure can only form with weak interactions between nanofibrils and mineral plates...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28434230/single-layer-graphene-membranes-withstand-ultrahigh-applied-pressure
#13
Luda Wang, Christopher M Williams, Michael S H Boutilier, Piran R Kidambi, Rohit Karnik
High mechanical strength is essential for pressure-driven membrane separations with nanoporous single-layer graphene, but its ability to withstand high pressures remains to be demonstrated. We monitored failure of centimeter-scale single-layer graphene membranes on porous supports subjected to high pressures. Consistent with theory, the membranes were found to withstand higher pressures when placed on porous supports with smaller pore diameters, but failure occurred over a surprisingly broad range of pressures, attributed to heterogeneous susceptibility to failure at wrinkles, defects, and slack in the suspended graphene...
April 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28433722/high-precision-genome-sequencing-of-engineered-g-oxydans-621h-by-combining-long-nanopore-and-short-accurate-illumina-reads
#14
Angela Kranz, Alexander Vogel, Ursula Degner, Ines Kiefler, Michael Bott, Björn Usadel, Tino Polen
State of the art and novel high-throughput DNA sequencing technologies enable fascinating opportunities and applications in the life sciences including microbial genomics. Short high-quality read data already enable not only microbial genome sequencing, yet can be inadequately to solve problems in genome assemblies and for the analysis of structural variants, especially in engineered microbial cell factories. Single-molecule real-time sequencing technologies generating long reads promise to solve such assembly problems...
April 19, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28430192/a-monodisperse-transmembrane-%C3%AE-helical-peptide-barrel
#15
Kozhinjampara R Mahendran, Ai Niitsu, Lingbing Kong, Andrew R Thomson, Richard B Sessions, Derek N Woolfson, Hagan Bayley
The fabrication of monodisperse transmembrane barrels formed from short synthetic peptides has not been demonstrated previously. This is in part because of the complexity of the interactions between peptides and lipids within the hydrophobic environment of a membrane. Here we report the formation of a transmembrane pore through the self-assembly of 35 amino acid α-helical peptides. The design of the peptides is based on the C-terminal D4 domain of the Escherichia coli polysaccharide transporter Wza. By using single-channel current recording, we define discrete assembly intermediates and show that the pore is most probably a helix barrel that contains eight D4 peptides arranged in parallel...
May 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28429015/asymmetric-electroosmotic-pumping-across-porous-media-sandwiched-with-perforated-ion-exchange-membranes
#16
A Yaroshchuk, E E Licón, E K Zholkovskiy, M P Bondarenko, T Heldal
To have non-zero net flow in AC electroosmotic pumps, the electroosmosis (EO) has to be non-linear and asymmetric. This can be achieved due to ionic concentration polarization. This is known to occur close to micro-/nano-interfaces provided that the sizes of the nanopores are not too large compared to the Debye screening length. However, operation of the corresponding EO pumps can be quite sensitive to the solution concentration and, thus, unstable in practical applications. Concentration polarization of ion-exchange membranes is much more robust...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28426078/an-intravascular-bioartificial-pancreas-device-ibap-with-silicon-nanopore-membranes-snm-for-islet-encapsulation-under-convective-mass-transport
#17
Shang Song, Charles Blaha, Willieford Moses, Jaehyun Park, Nathan Wright, Joey Groszek, William Fissell, Shant Vartanian, Andrew M Posselt, Shuvo Roy
Diffusion-based bioartificial pancreas (BAP) devices are limited by poor islet viability and functionality due to inadequate mass transfer resulting in islet hypoxia and delayed glucose-insulin kinetics. While intravascular ultrafiltration-based BAP devices possess enhanced glucose-insulin kinetics, the polymer membranes used in these devices provide inadequate ultrafiltrate flow rates and result in excessive thrombosis. Here, we report the silicon nanopore membrane (SNM), which exhibits a greater hydraulic permeability and a superior pore size selectivity compared to polymer membranes for use in BAP applications...
April 20, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28426070/controllable-synthesis-of-ferromagnetic-antiferromagnetic-core-shell-nws-with-tunable-magnetic-properties
#18
M Irfan, C J Wang, U Khan, W J Li, X M Zhang, W J Kong, P Liu, C H Wan, Y W Liu, X F Han
Several nanotechnology applications are based on the promising scheme of highly anisotropic magnetic nanomaterials. Using this idea, we investigated the structure, magnetic properties, and interfacial exchange anisotropy effects of the Ni/Cr2O3 and Fe/Cr2O3 core-shell nanowires (NWs) geometry. A template-based strategy was developed to synthesize Ni (Fe)-Cr2O3 core-shell NWs, which combines a wet-chemical route and electrodeposition within the nanopores of the membranes. Structural determination in correlation with magnetic testing shows that the crystalline Cr2O3-nanoshells (NSs) cause an enhanced exchange bias, providing an extra source of anisotropy that leads to their magnetic stability...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28426059/evolution-of-dealloying-induced-strain-in-nanoporous-gold-crystals
#19
Yu-Chen Karen Chen-Wiegart, Ross Harder, David C Dunand, Ian McNulty
We studied the evolution of dealloying-induced strain along the {111} in a Ag-Au nano-crystal in situ, during formation of nanoporous gold at the initial stage of dealloying using Bragg coherent X-ray diffractive imaging. The strain magnitude with maximum probability in the crystal doubled in 10 s of dealloying. Although formation of nano-pores just began at the surface, the greatest strain is located 60-80 nm deep within the crystal. Dealloying induced a compressive strain in this region, indicating volume shrinkage occurred during pore formation...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28425518/dynamic-manipulation-of-the-local-ph-within-a-nanopore-triggered-by-surface-induced-phase-transition
#20
Akira Koyama, Kazuhiro Fukami, Yujin Imaoka, Atsushi Kitada, Tetsuo Sakka, Takeshi Abe, Kuniaki Murase, Masahiro Kinoshita
Manipulating the local pH within nanoconfinement is essential in nanofluidics technology and its applications. Since the conventional strategy utilizes the overlapping of an electric double layer formed for charge compensation by protons near a negatively charged pore-wall surface, pH variation within a pore is limited to the acidic side. To achieve the variation at the alkaline side, we developed a system comprising a hydrophobic pore-wall surface and aqueous solution containing hydrophobic cations. Beyond a threshold cation concentration, a nanopore is filled with the second phase where the cations are remarkably enriched due to surface-induced phase transition (SIFT) originating from the hydrophobic effect...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
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