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Nanopore

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https://www.readbyqxmd.com/read/28107940/incorporation-of-zeolitic-imidazolate-framework-zif-8-derived-nanoporous-carbons-in-methacrylate-polymeric-monoliths-for-capillary-electrochromatography
#1
Enrique Javier Carrasco-Correa, Andrea Martínez-Vilata, José Manuel Herrero-Martínez, José B Parra, Fernando Maya, Victor Cerdà, Carlos Palomino Cabello, Gemma Turnes Palomino, Frantisek Svec
A series of metal organic frameworks-derived nanoporous carbons originating from zeolitic imidazolate framework-8 (ZIF-8) crystals as precursors have been prepared via varying the preparation conditions. The ZIF-8-derived carbons were subsequently admixed in the methacrylate monomers containing polymerization mixtures and polymerized to obtain monolithic columns for capillary electrochromatography (CEC). The effect of particle size and content of the ZIF-8-derived carbon materials in the polymerization mixture on the performance of the hybrid monolithic columns was investigated in detail...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107634/electrolyte-gradient-based-modulation-of-molecular-transport-through-nanoporous-gold-membranes
#2
Daniel A McCurry, Ryan C Bailey
Nanopores, and nanoporous materials in general, are interesting for applications in chemical and biomolecular transport as pore sizes are on the same scale as the dimension of many (bio)chemical species. Many studies have focused on either single pores or small arrays of cylindrical pores, which are convenient in terms of their amenability towards computational modeling of transport phenomenon. However, the limited overall porosity may inhibit transport flux as well as the eventual implementation of these materials as active separation elements...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28106456/interplay-between-adsorption-and-hydrodynamics-in-nanochannels-towards-tunable-membranes
#3
Sela Samin, René van Roij
We study how the adsorption of a near-critical binary mixture in a nanopore is modified by flow inside the pore. We identify three types of steady states upon variation of the pore Péclet number (Pe_{p}), which can be reversibly accessed by the application of an external pressure. Interestingly, for small Pe_{p} the pore acts as a weakly selective membrane which separates the mixture. For intermediate Pe_{p}, the flow effectively shifts the adsorption in the pore, thereby opening possibilities for enhanced and tunable solute transport through the pore...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106047/scale-dependent-diffusion-anisotropy-in-nanoporous-silicon
#4
Daria Kondrashova, Alexander Lauerer, Dirk Mehlhorn, Hervé Jobic, Armin Feldhoff, Matthias Thommes, Dipanjan Chakraborty, Cedric Gommes, Jovana Zecevic, Petra de Jongh, Armin Bunde, Jörg Kärger, Rustem Valiullin
Nanoporous silicon produced by electrochemical etching of highly B-doped p-type silicon wafers can be prepared with tubular pores imbedded in a silicon matrix. Such materials have found many technological applications and provide a useful model system for studying phase transitions under confinement. This paper reports a joint experimental and simulation study of diffusion in such materials, covering displacements from molecular dimensions up to tens of micrometers with carefully selected probe molecules. In addition to mass transfer through the channels, diffusion (at much smaller rates) is also found to occur in directions perpendicular to the channels, thus providing clear evidence of connectivity...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105845/nanopore-sensing
#5
Wenqing Shi, Alicia K Friedman, Lane A Baker
No abstract text is available yet for this article.
January 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28103013/building-nanoporous-metal-organic-frameworks-armour-on-fibers-for-high-performance-composite-materials
#6
Xiaobin Yang, Xu Jiang, Yudong Huang, Zhanhu Guo, Lu Shao
The nanoporous Metal-Organic Frameworks (MOFs) "armour" is in situ intergrown onto the surfaces of carbon fibers (CFs) by nitric acid oxidization to supply nucleation sites, and serves as a novel interfacial linker between the fiber and polymer matrix and a smart cushion to release interior and exterior applied forces. Simultaneous enhancements of the interfacial and interlaminar shear strength as well as the tensile strength of CFs were achieved. With the aid of an ultrasonic "cleaning" process, the optimized surface energy and tensile strength of CFs with a MOF "armour" are 83...
January 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28102180/hfo2-porous-anodic-alumina-composite-films-for-multifunctional-data-storage-media-materials-under-electric-field-control
#7
Liqian Qi, Di-Ya Pan, Jun-Qing Li, Lihu Liu, Huiyuan Sun
New materials for achieving direct electric field control of ferromagnetism and resistance behavior are highly desirable in the development of multifunctional data storage devices. In this paper, HfO2 nanoporous films have been fabricated on porous anodic alumina (PAA) substrates by DC-reactive magnetron sputtering. Electrically induced resistive switching (RS) and modulated room temperature ferromagnetism are simultaneously found in a Ag/HfO2/PAA/Al (Ag/HP/Al) heterostructure. The switching mechanism between low resistance state (LRS) and high resistance state (HRS) is generally attributed to the formation/rupture of conductive filaments which may consist of oxygen vacancies...
January 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28100585/fast-and-accurate-de-novo-genome-assembly-from-long-uncorrected-reads
#8
Robert Vaser, Ivan Sovic, Niranjan Nagarajan, Mile Sikic
The assembly of long reads from Pacific Biosciences and Oxford Nanopore Technologies typically requires resource intensive error correction and consensus generation steps to obtain high quality assemblies. We show that the error correction step can be omitted and high quality consensus sequences can be generated efficiently with a SIMD accelerated, partial order alignment based stand-alone consensus module called Racon. Based on tests with PacBio and Oxford Nanopore datasets we show that Racon coupled with Miniasm enables consensus genomes with similar or better quality than state-of-the-art methods while being an order of magnitude faster...
January 18, 2017: Genome Research
https://www.readbyqxmd.com/read/28099024/surface-interactions-and-confinement-of-methane-a-high-pressure-magic-angle-spinning-nmr-and-computational-chemistry-study
#9
Salim Ok, David W Hoyt, Amity Andersen, Julie Sheets, Susan A Welch, David R Cole, Karl Todd Mueller, Nancy M Washton
Characterization and modeling of the molecular-level behavior of simple hydrocarbon gases, such as methane, in the presence of both nonporous and nano-porous mineral matrices allows for predictive understanding of important processes in engineered and natural systems. In this study, changes in local electromagnetic environments of the carbon atoms in methane under conditions of high pressure (up to 130 bar) and moderate temperature (up to 346 K) were observed with 13C magic-angle spinning (MAS) NMR spectroscopy while the methane gas was mixed with two model solid substrates: a fumed non-porous, 12 nm particle size silica and a mesoporous silica with 200 nm particle size and 4 nm average pore diameter...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098977/lamellar-metal-organic-framework-derived-fe-n-c-non-noble-electrocatalysts-with-bimodal-porosity-for-efficient-oxygen-reduction
#10
Zhongtao Li, Hongdi Sun, Liangqin Wei, Wen-Jie Jiang, Mingbo Wu, Jin-Song Hu
Developing highly efficient and stable non-Pt electrocatalysts for oxygen reduction reaction (ORR) to replace the state-of-the-art noble metal is essential for the commercialization of fuel cells. Fe-N-C based electrocatalysts are considered as one of promising alternatives to commercial Pt/C. An efficient electrocatalyst commonly requires large density of active site, high surface area, and desirable porosity, especially multi-modal porosity with both large pores for efficient mass transfer and small pores for exposing as much active sites as possible...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28096449/specific-glucoside-transporters-influence-septal-structure-and-function-in-the-filamentous-heterocyst-forming-cyanobacterium-anabaena-sp-strain-pcc-7120
#11
Mercedes Nieves-Morión, Sigal Lechno-Yossef, Rocío López-Igual, José E Frías, Vicente Mariscal, Dennis J Nürnberg, Conrad W Mullineaux, C Peter Wolk, Enrique Flores
: When deprived of combined nitrogen, some filamentous cyanobacteria contain two cell types: vegetative cells that fix CO2 through oxygenic photosynthesis and heterocysts that are specialized in N2 fixation. In the diazotrophic filament, the vegetative cells provide the heterocysts with reduced carbon (mainly in the form of sucrose) and heterocysts provide the vegetative cells with combined nitrogen. Septal junctions traverse peptidoglycan through structures known as nanopores, and appear to mediate intercellular molecular transfer that can be traced with fluorescent markers, including the sucrose analog esculin (a coumarin glucoside) that is incorporated into the cells...
January 17, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28094971/predicting-nanoscale-dynamics-of-a-glass-forming-liquid-from-its-macroscopic-bulk-behavior-and-vice-versa
#12
Karolina Adrjanowicz, Kamil Kaminski, Magdalena Tarnacka, Grzegorz Szklarz, Marian Paluch
The properties of a molecular liquid confined at the nanometer length scale can be very much distinct from the bulk. For that reason, the macro- and the nanoscopic behaviors of glass-forming liquids are regarded as two non-connected realms, governed by their own rules. Here, we show that the glassy dynamics in molecular liquids confined to nanometer pores might obey the density scaling relation, /T, just like in bulk fluids. Even more surprisingly, the same value of the scaling exponent  superposes the -relaxation time measured at different state points in nanoscale confinement and on increased pressure...
January 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28094919/synthesis-of-3d-nanoporous-li-rich-layered-cathode-oxides-for-high-volumetric-and-power-energy-density-li-ion-batteries
#13
Bao Qiu, Chong Yin, Yonggao Xia, Zhaoping Liu
As rechargeable Li-ion batteries have expanded their applications into onboard energy storage for electric vehicles, the energy and power must be increased to meet the new demands. Li-rich layered oxides are one of the most promising candidate materials, however, they are very difficult to be compatible with high volumetric energy density and power density. Here we develop an innovative approach to synthesize three dimensional (3D) nanoporous Li-rich layered oxides Li[Li0.144Ni0.136Co0.136Mn0.544]O2, directly occurring at deep chemical delithiation with carbon dioxide...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094515/nanoporous-materials-for-the-onboard-storage-of-natural-gas
#14
K Vasanth Kumar, Kathrin Preuss, Maria-Magdalena Titirici, Francisco Rodríguez-Reinoso
Climate change, global warming, urban air pollution, energy supply uncertainty and depletion, and rising costs of conventional energy sources are, among others, potential socioeconomic threats that our community faces today. Transportation is one of the primary sectors contributing to oil consumption and global warming, and natural gas (NG) is considered to be a relatively clean transportation fuel that can significantly improve local air quality, reduce greenhouse-gas emissions, and decrease the energy dependency on oil sources...
January 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28094510/nanoporous-gold-based-electrode-morphology-libraries-for-investigating-structure-property-relationships-in-nucleic-acid-based-electrochemical-biosensors
#15
Zimple Matharu, Pallavi Daggumati, Ling Wang, Tatiana S Dorofeeva, Zidong Li, Erkin Seker
Nanoporous gold (np-Au) electrode coatings significantly enhance performance of electrochemical nucleic acid biosensors due to their three-dimensional nanoscale network, high electrical conductivity, facile surface functionalization, and biocompatibility. Contrary to planar electrodes, the np-Au electrodes also exhibit sensitive detection in the presence of common biofouling media due to their porous structure. However, the pore size of the nano-matrix plays a critical role in dictating the extent of biomolecular capture and transport...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094238/evaporating-metal-nanocrystal-arrays
#16
Xue Zhang, James Joy, Chenwei Zhao, Jin-Ho Kim, Gustavo Fernandes, Jimmy Xu, James Valles
Anodic aluminum oxide (AAO) substrates with a self-ordered triangular array of nanopores provide the means to fabricate multiple forms of nano materials, such as nanowires and nanoparticles. This study focuses on nanostructures that emerge in thin films of metals thermally evaporated onto the surface of AAO. Previous work showed that films of different evaporated metals assume dramatically different structures, e.g. an ordered triangular array of nearly monodisperse nanoparticles forms for Lead(Pb) while a polycrystalline nanohoneycomb structure forms for Silver(Ag)...
January 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28094026/nanoporous-hydroxyapatite-sodium-titanate-bilayer-on-titanium-implants-for-improved-osteointegration
#17
A Carradò, F Perrin-Schmitt, Q V Le, M Giraudel, C Fischer, G Koenig, L Jacomine, L Behr, A Chalom, L Fiette, A Morlet, G Pourroy
OBJECTIVE: The aim of this study was to improve the strength and quality of the titanium-hydroxyapatite interface in order to prevent long-term failure of the implanted devices originating from coating delamination and to test it in an in-vivo model. METHODS: Ti disks and dental commercial implants were etched in Kroll solution. Thermochemical treatments of the acid-etched titanium were combined with sol-gel hydroxyapatite (HA) coating processes to obtain a nanoporous hydroxyapatite/sodium titanate bilayer...
January 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28092815/facile-fabrication-of-fe3o4-octahedra-nanoporous-copper-network-composite-for-high-performance-anode-in-li-ion-batteries
#18
Jiajia Ye, Zhihong Wang, Qin Hao, Binbin Liu, Caixia Xu
Fe3O4 octahedra embedded in conductive nanoporous copper (NPC) network are straightforwardly fabricated by means of alloy refining followed by facile electroless dealloying in mild condition. During selectively dissolving the Al from FeCuAl alloy, the residual Cu atoms assemble to form sponge-like nanostructure, meanwhile the Fe atoms undergo spontaneous oxidation and aggregation to grow into Fe3O4 octahedra travelled through NPC network. Owing to the combination of conductive NPC network, Fe3O4 octahedra exhibit dramatically enhanced lithium storage performances with excellent reversible capacity, enhanced rate performance, as well outstanding cyclability compared with pure Fe3O4 octahedra...
January 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28091599/a-comprehensive-numerical-model-for-simulating-fluid-transport-in-nanopores
#19
Yuan Zhang, Wei Yu, Kamy Sepehrnoori, Yuan Di
Since a large amount of nanopores exist in tight oil reservoirs, fluid transport in nanopores is complex due to large capillary pressure. Recent studies only focus on the effect of nanopore confinement on single-well performance with simple planar fractures in tight oil reservoirs. Its impacts on multi-well performance with complex fracture geometries have not been reported. In this study, a numerical model was developed to investigate the effect of confined phase behavior on cumulative oil and gas production of four horizontal wells with different fracture geometries...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088017/co-delivery-of-ibuprofen-and-gentamicin-from-nanoporous-anodic-titanium-dioxide-layers
#20
Anna Pawlik, Magdalena Jarosz, Karolina Syrek, Grzegorz D Sulka
Although single-drug therapy may prove insufficient in treating bacterial infections or inflammation after orthopaedic surgeries, complex therapy (using both an antibiotic and an anti-inflammatory drug) is thought to address the problem. Among drug delivery systems (DDSs) with prolonged drug release profiles, nanoporous anodic titanium dioxide (ATO) layers on Ti foil are very promising. In the discussed research, ATO samples were synthesized via a three-step anodization process in an ethylene glycol-based electrolyte with fluoride ions...
January 8, 2017: Colloids and Surfaces. B, Biointerfaces
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