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https://www.readbyqxmd.com/read/28527338/facile-mass-production-of-nanoporous-sno2-nanosheets-as-anode-materials-for-high-performance-lithium-ion-batteries
#1
Wenli Wei, Pengcheng Du, Dong Liu, Hongxing Wang, Peng Liu
Facile one-step ultrasonic-assisted chemical precipitation strategy has been developed for the mass production of SnO2 nanomaterials with different morphologies. As anode material for lithium-ion batteries, the nanoporous SnO2 nanosheets exhibited an extremely high initial specific capacity of 2231mAh/g in comparison with 1242mAh/g of the SnO2 microcrystals and 1244mAh/g of the nanoporous SnO2 nanoflowers. Meanwhile the nanoporous SnO2 nanosheet electrode displayed a specific capacity of 688mAh/g after 60 cycles at 0...
May 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28524916/facile-fabrication-of-highly-controllable-gating-systems-based-on-the-combination-of-inverse-opal-structure-and-dynamic-covalent-chemistry
#2
Chen Wang, Haowei Yang, Li Tian, Shiqiang Wang, Ning Gao, Wanlin Zhang, Peng Wang, Xianpeng Yin, Guangtao Li
A three-dimensional (3D) inverse opal with periodic and porous structures has shown great potential for applications not only in optics and optoelectronics, but also in functional membranes. In this work, the benzaldehyde group was initially introduced into a 3D nanoporous inverse opal, serving as a platform for fabricating functional membranes. By employing the dynamic covalent approach, a highly controllable gating system was facilely fabricated to achieve modulable and reversible transport features. It was found that the physical/chemical properties and pore size of the gating system could easily be regulated through post-modification with amines...
May 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28524689/facile-anhydrous-proton-transport-on-hydroxyl-functionalized-graphane
#3
Abhishek Bagusetty, Pabitra Choudhury, Wisssam A Saidi, Bridget Derksen, Elizabeth Gatto, J Karl Johnson
Graphane functionalized with hydroxyl groups is shown to rapidly conduct protons under anhydrous conditions through a contiguous network of hydrogen bonds. Density functional theory calculations predict remarkably low barriers to diffusion of protons along a 1D chain of surface hydroxyls. Diffusion is controlled by the local rotation of hydroxyl groups, a mechanism that is very different from that found in 1D water wires in confined nanopores or in bulk water. The proton mean square displacement in the 1D chain was observed to follow Fickian diffusion rather than the expected single-file mobility...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524266/single-molecule-and-ensemble-diffusivities-in-individual-nanopores-with-spatially-dependent-mobility
#4
Julia Rybka, Jörg Kärger, Ulrich Tallarek
We investigate single-molecule and ensemble diffusivities in a silica nanopore with chemically modified surface by molecular dynamics simulations. Solutes with graded polarity (nonpolar ethylbenzene and moderately polar benzyl alcohol) are equilibrated with a 40:60 (v/v) water/acetonitrile solvent in a 10 nm pore, whose surface has been rendered hydrophobic by modification with alkyl chains. Simulations enable a detailed sampling of spatially dependent solvent and solute mobilities, which originate in a micro-heterogeneity induced by the surface modification...
May 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28524241/fabrication-techniques-enabling-ultrathin-nanostructured-membranes-for-separations
#5
REVIEW
Marcela Mireles Ramirez, Thomas R Gaborski
The fabrication of nanostructured materials is an area of continuous improvement and innovative techniques that fulfill the demand of many fields of research and development. The continuously decreasing size of the smallest patternable feature has expanded the catalog of methods enabling the fabrication of nanostructured materials. Several of these nanofabrication techniques have sprouted from applications requiring nanoporous membranes such as molecular separations, cell culture, and plasmonics. This review summarizes methods that successfully produce through-pores in ultrathin films exhibiting an approximate pore size to thickness ratio of one, which has been shown to be beneficial due to high permeability and improved separation potential...
May 19, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28522866/femtosecond-laser-fabrication-of-anatase-tio2-micro-nanostructures-with-chemical-oxidation-and-annealing
#6
Ting Huang, Jinlong Lu, Xin Zhang, Rongshi Xiao, Wuxiong Yang, Qiang Wu
The fabrication of nanoporous anatase TiO2 on a microstructured Ti base is achieved through an innovative hybrid fabrication method involving femtosecond laser ablation coupled with H2O2 oxidation and annealing. The anatase TiO2 micro-nanostructures have superior photocatalytic degradation of methyl orange due to enhanced light harvesting capacity and surface area. The photodegradation efficiency increases by a maximum of 80% compared to the nanoporous anatase TiO2 fabricated through H2O2 oxidation and annealing only (without femtosecond laser ablation)...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521093/behavior-of-the-enthalpy-of-adsorption-in-nanoporous-materials-close-to-saturation-conditions
#7
Ariana Torres-Knoop, Ali Poursaeidesfahani, Thijs J H Vlugt, David Dubbeldam
Many important industrial separation processes based on adsorption operate close to saturation. In this regime, the underlying adsorption processes are mostly driven by entropic forces. At equilibrium, the entropy of adsorption is closely related to the enthalpy of adsorption. Thus, studying the behavior of the enthalpy of adsorption as a function of loading is fundamental in the understanding of the separation processes. Unfortunately, close to saturation, the enthalpy of adsorption is hard to measure experimentally and hard to compute in simulations...
May 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28521089/nanoporous-block-polymer-thin-films-functionalized-with-bio-inspired-ligands-for-the-efficient-capture-of-heavy-metal-ions-from-water
#8
Jacob Logan Weidman, Ryan A Mulvenna, Bryan W Boudouris, William A Phillip
Heavy metal contamination of water supplies poses a serious threat to public health, prompting the development of novel and sustainable treatment technologies. One promising approach is to molecularly engineer the chemical affinity of a material for the targeted removal of specific molecules from solution. In this work, nanoporous polymer thin films generated from tailor-made block polymers were functionalized with the bio-inspired moieties glutathione and cysteamine for the removal of heavy metal ions, including lead and cadmium, from aqueous solutions...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28520525/companion-and-point-of-care-sensor-system-for-rapid-multiplexed-detection-of-a-panel-of-infectious-disease-markers
#9
Anjan Panneer Selvam, Shalini Prasad
A nanochannel-based electrochemical biosensor has been demonstrated for rapid and multiplexed detection of a panel of three biomarkers associated with rapid detection of sepsis. The label-free biosensor detected procalcitonin (PCT), lipoteichoic acid (LTA), and lipopolysaccharide (LPS) from human whole blood. The biosensor comprises a nanoporous nylon membrane integrated onto a microelectrode sensor platform for nanoconfinement effects. Charge perturbations due to biomarker binding are recorded as impedance changes using electrochemical impedance spectroscopy...
June 2017: SLAS Technology
https://www.readbyqxmd.com/read/28516507/an-all-plastic-field-effect-nanofluidic-diode-gated-by-a-conducting-polymer-layer
#10
Gonzalo Pérez-Mitta, Waldemar A Marmisollé, Christina Trautmann, María Eugenia Toimil-Molares, Omar Azzaroni
The design of an all-plastic field-effect nanofluidic diode is proposed, which allows precise nanofluidic operations to be performed. The fabrication process involves the chemical synthesis of a conductive poly(3,4-ethylenedioxythiophene) (PEDOT) layer over a previously fabricated solid-state nanopore. The conducting layer acts as gate electrode by changing its electrochemical state upon the application of different voltages, ultimately changing the surface charge of the nanopore. A PEDOT-based nanopore is able to discriminate the ionic species passing through it in a quantitative and qualitative manner, as PEDOT nanopores display three well-defined voltage-controlled transport regimes: cation-rectifying, non-rectifying, and anion rectifying regimes...
May 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28516181/a-pulse-electrosynthesized-nanoporous-nickel-oxyhydroxide-borate-thin-film-in-electro-and-photoelectro-reforming-of-methanol-for-selective-production-of-formate
#11
Chia-Yu Lin, Yu-Chien Chueh, Cheng-Hsien Wu
An nanoporous nickel oxyhydroxide-borate (NiBi) thin film, consisting of an aggregate of spherical particles self-assembled from NiBi nanopetals, has been synthesized using a simple and cost-effective pulse electrodeposition method without the addition of any surfactant, and demonstrated as an efficient, selective, and robust electrocatalyst in the electrochemical and photoelectrochemical reforming of methanol into formate.
May 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28512341/a-new-paradigm-in-sweat-based-wearable-diagnostics-biosensors-using-room-temperature-ionic-liquids-rtils
#12
Rujuta D Munje, Sriram Muthukumar, Badrinath Jagannath, Shalini Prasad
Successful commercialization of wearable diagnostic sensors necessitates stability in detection of analytes over prolonged and continuous exposure to sweat. Challenges are primarily in ensuring target disease specific small analytes (i.e. metabolites, proteins, etc.) stability in complex sweat buffer with varying pH levels and composition over time. We present a facile approach to address these challenges using RTILs with antibody functionalized sensors on nanoporous, flexible polymer membranes. Temporal studies were performed using both infrared spectroscopic, dynamic light scattering, and impedimetric spectroscopy to demonstrate stability in detection of analytes, Interleukin-6 (IL-6) and Cortisol, from human sweat in RTILs...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28508542/dynamic-self-assembly-of-homogenous-microcyclic-structures-controlled-by-a-silver-coated-nanopore
#13
Rui Gao, Yao Lin, Yi-Lun Ying, Xiao-Yuan Liu, Xin Shi, Yong-Xu Hu, Yi-Tao Long, He Tian
The self-assembly of nanoparticles is a challenging process for organizing precise structures with complicated and ingenious structures. In the past decades, a simple, high-efficiency, and reproducible self-assembly method from nanoscale to microscale has been pursued because of the promising and extensive application prospects in bioanalysis, catalysis, photonics, and energy storage. However, microscale self-assembly still faces big challenges including improving the stability and homogeneity as well as pursuing new assembly methods and templates for the uniform self-assembly...
May 16, 2017: Small
https://www.readbyqxmd.com/read/28508050/butterfly-gyroid-nanostructures-as-a-time-frozen-glimpse-of-intracellular-membrane-development
#14
Bodo D Wilts, Benjamin Apeleo Zubiri, Michael A Klatt, Benjamin Butz, Michael G Fischer, Stephen T Kelly, Erdmann Spiecker, Ullrich Steiner, Gerd E Schröder-Turk
The formation of the biophotonic gyroid material in butterfly wing scales is an exceptional feat of evolutionary engineering of functional nanostructures. It is hypothesized that this nanostructure forms by chitin polymerization inside a convoluted membrane of corresponding shape in the endoplasmic reticulum. However, this dynamic formation process, including whether membrane folding and chitin expression are simultaneous or sequential processes, cannot yet be elucidated by in vivo imaging. We report an unusual hierarchical ultrastructure in the butterfly Thecla opisena that, as a solid material, allows high-resolution three-dimensional microscopy...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28507711/interfacial-engineering-of-renewable-metal-organic-framework-derived-honeycomb-like-nanoporous-aluminum-hydroxide-with-tunable-porosity
#15
Ye-Tang Pan, Lu Zhang, Xiaomin Zhao, De-Yi Wang
Novel honeycomb-like mesoporous aluminum hydroxide (pATH) was synthesized via a facile one-step reaction by employing ZIF-8 as a template. This self-decomposing template was removed automatically under acidic conditions without the need for any tedious or hazardous procedures. Meanwhile, the pore size of pATH was easily modulated by tuning the dimensions of the ZIF-8 polyhedrons. Of paramount importance was the fact that the dissolved ZIF-8 in solution was regenerated upon deprotonation of the ligand under mild alkali conditions, and was reused in the preparation of pATH, thus forming a delicate synthesis cycle...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28505460/thermal-management-in-nanofiber-based-face-mask
#16
Ankun Yang, Lili Cai, Rufan Zhang, Jiangyan Wang, Po-Chun Hsu, Hongxia Wang, Guangmin Zhou, Jinwei Xu, Yi Cui
Face masks are widely used to filter airborne pollutants, especially when particulate matter (PM) pollution has become a serious concern to public health. Here, the concept of thermal management is introduced into face masks for the first time to enhance the thermal comfort of the user. A system of nanofiber on nanoporous polyethylene (fiber/nanoPE) is developed where the nanofibers with strong PM adhesion ensure high PM capture efficiency (99.6% for PM2.5) with low pressure drop and the nanoPE substrate with high infrared (IR) transparency (92...
May 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/28504794/reactive-oligo-dimethylsiloxane-mesogens-and-their-nanostructured-thin-films
#17
K Nickmans, Ph Leclère, J Lub, D J Broer, A P H J Schenning
Oligo(dimethylsiloxane)-based reactive mesogens were prepared and shown to form room-temperature smectic phases which were 'frozen-in' by photopolymerization. Homeotropically aligned, nanostructured thin films were obtained by spincoating, and micropatterning was demonstrated. These hybrid reactive mesogens are suitable for the preparation of aligned nanostructured polymer thin films with potential applications ranging from stimuli responsive coatings to nanoporous membranes.
May 15, 2017: Soft Matter
https://www.readbyqxmd.com/read/28503666/robust-long-read-native-dna-sequencing-using-the-ont-csgg-nanopore-system
#18
Jean-Michel Carter, Shobbir Hussain
Background: The ability to obtain long read lengths during DNA sequencing has several potentially important practical applications. Especially long read lengths have been reported using the Nanopore sequencing method, currently commercially available from Oxford Nanopore Technologies (ONT). However, early reports have demonstrated only limited levels of combined throughput and sequence accuracy. Recently, ONT released a new CsgG pore sequencing system as well as a 250b/s translocation chemistry with potential for improvements...
April 6, 2017: Wellcome Open Research
https://www.readbyqxmd.com/read/28503401/bio-inspired-micro-to-nanoporous-polymers-with-tunable-stiffness
#19
Julia Syurik, Ruth Schwaiger, Prerna Sudera, Stephan Weyand, Siegbert Johnsen, Gabriele Wiegand, Hendrik Hölscher
Background: Inspired by structural hierarchies and the related excellent mechanical properties of biological materials, we created a smoothly graded micro- to nanoporous structure from a thermoplastic polymer. Results: The viscoelastic properties for the different pore sizes were investigated in the glassy regime by dynamic flat-punch indentation. Interestingly, the storage modulus was observed to increase with increasing pore-area fraction. Conclusion: This outcome appears counterintuitive at first sight, but can be rationalized by an increase of the pore wall thickness as determined by our quantitative analysis of the pore structure...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503397/relationships-between-chemical-structure-mechanical-properties-and-materials-processing-in-nanopatterned-organosilicate-fins
#20
Gheorghe Stan, Richard S Gates, Qichi Hu, Kevin Kjoller, Craig Prater, Kanwal Jit Singh, Ebony Mays, Sean W King
The exploitation of nanoscale size effects to create new nanostructured materials necessitates the development of an understanding of relationships between molecular structure, physical properties and material processing at the nanoscale. Numerous metrologies capable of thermal, mechanical, and electrical characterization at the nanoscale have been demonstrated over the past two decades. However, the ability to perform nanoscale molecular/chemical structure characterization has only been recently demonstrated with the advent of atomic-force-microscopy-based infrared spectroscopy (AFM-IR) and related techniques...
2017: Beilstein Journal of Nanotechnology
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