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https://www.readbyqxmd.com/read/28102180/hfo2-porous-anodic-alumina-composite-films-for-multifunctional-data-storage-media-materials-under-electric-field-control
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/28077442/miniaturized-nanopore-dna-sequencing-accelerating-the-path-to-precision-medicine
#15
Linnea M Baudhuin, Matthew J Ferber
No abstract text is available yet for this article.
January 11, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28075041/engineering-matrix-free-laser-desorption-ionization-mass-spectrometry-using-glancing-angle-deposition-films
#16
Reshma Singh, Louis W Bezuidenhout, Abebaw Jemere, Zhen Wang, Michael Brett, D Jed Harrison
Thin, nanoporous films fabricated using Glancing Angle Deposition (GLAD) technology are demonstrated for solid matrix laser desorption ionization mass spectrometry (SMALDI-MS). GLAD allows facile engineering of naonporosity, film thickness, post alignment, and material composition, as demonstrated here by the fabrication of Co-GLAD and Si-GLAD films for SMALDI, and by exploration of the SMALDI performance as a function of thickness, post density, and angle of the post relative to surface normal. GLAD films were prepared by electron beam evaporation onto silicon substrates, using steep angles of incidence for the vacuum deposition, with computer controlled substrate rotation...
January 11, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28074743/synthesis-of-nanoporous-carbon-for-fast-uptake-of-cr-vi-and-ni-ii-from-aqueous-solution
#17
Imed Ghiloufi
Nanoporous carbon (NPC), based on organic xerogel compounds, was prepared at 650 ºC pyrolysis temperature by sol-gel method from pyrogallol and formaldehyde (PF-650) mixtures in water using picric acid as catalyst. The performance of NPC was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and nitrogen porosimetry. The metal uptake characteristics were explored using effective parameters including pH, contact time, initial metal ion concentration, and temperature...
January 10, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28072510/co2-photoreduction-by-formate-dehydrogenase-and-a-ru-complex-in-a-nanoporous-glass-reactor
#18
Tomoyasu Noji, Tetsuro Jin, Mamoru Nango, Nobuo Kamiya, Yutaka Amao
In this study, we demonstrated the conversion of CO2 to formic acid under ambient conditions in a photoreduction nanoporous reactor using a photosensitizer, methyl viologen (MV(2+)), and formate dehydrogenase (FDH). The overall efficiency of this reactor was 14 times higher than that of the equivalent solution. The accumulation rate of formic acid in the nanopores of 50 nm is 83 times faster than that in the equivalent solution. Thus, this CO2 photoreduction nanoporous glass reactor will be useful as an artificial photosynthesis system that converts CO2 to fuel...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28071590/fabrication-of-nanopore-and-nanoparticle-arrays-with-high-aspect-ratio-aao-masks
#19
Zeping Li, Zhimou Xu, Xiaopeng Qu, Shuangbao Wang, Jing Peng, Lihong Mei
How to use high aspect ratio anodic aluminum oxide (AAO) membranes as the etching and evaporation mask is one of the unsolved problems in the application of nanostructured arrays. Here we describe that the versatile utilizations of the highly ordered AAO membranes with high aspect ratio more than 20 as universal masks for formations of various nanostructure arrays on various substrates. The result shows that the fabricated nanopore and nanoparticle arrays of substrates inherit the regularity of the AAO membranes completely...
January 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28070896/tiny-protein-detection-using-pressure-through-solid-state-nanopores
#20
Ji Li, Rui Hu, Xiaoqing Li, Xin Tong, Dapeng Yu, Qing Zhao
Solid-state nanopore is a promising tool to detect proteins and its complexes. Small proteins (sub-35 kDa) translocate very fast which could not be detected by normal patch-clamp recording instrument due to low temporal resolution. We firstly introduce pressure into protein study and detection. The pressure-derived force, combined with the voltage bias, makes very tiny protein (MW<6.5 kDa) detection possible. Capture rate for Aprotinin is enhanced five times more than that in traditional voltage-driven method by fine tuning of pressure and voltage...
January 9, 2017: Electrophoresis
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