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Nicholas C Burtch, Jurn Heinen, Thomas D Bennett, David Dubbeldam, Mark D Allendorf
Some of the most remarkable recent developments in metal-organic framework (MOF) performance properties can only be rationalized by the mechanical properties endowed by their hybrid inorganic-organic nanoporous structures. While these characteristics create intriguing application prospects, the same attributes also present challenges that will need to be overcome to enable the integration of MOFs with technologies where these promising traits can be exploited. In this review, emerging opportunities and challenges are identified for MOF-enabled device functionality and technological applications that arise from their fascinating mechanical properties...
November 17, 2017: Advanced Materials
Nelli Teske, Jeremias Sibold, Johannes Schumacher, Nikolas K Teiwes, Martin Gleisner, Ingo P Mey, Claudia Steinem
A number of techniques has been developed and analyzed in recent years to generate pore-spanning membranes (PSMs). While quite a number of methods rely on nanoporous substrates, only a few use micrometer-sized pores to be able to individually resolve suspending membranes by means of fluorescence microscopy. To be able to produce PSMs on pores that are micrometer in size, an orthogonal functionalization strategy resulting in a hydrophilic surface is highly desirable. Here, we report on a method to prepare PSMs based on the evaporation of a thin layer of silicon monoxide on top of the porous substrate...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Amit Sharma, Keith V Lawler, Jarod J Wolffis, Christopher T Eckdahl, Cooper S McDonald, Jesse L C Rowsell, Stephen A Fitzgerald, Paul M Forster
We examine the adsorption of hydrogen and deuterium into the nanoporous nickel phosphate, VSB-5. Based on gas sorption analysis, VSB-5 exhibits one of the highest measured H2 heats of adsorption (HOA) for hydrogen (16 kJ/mol) yet reported. This high HOA is consistent with an unusually large redshift in the Q(1) and Q(0) hydrogen vibrational modes as measured with in situ IR spectroscopy. The HOA for D2 is measured to be 2 kJ/mol higher than for H2. Ideal Adsorbed Solution Theory analysis of H2 and D2 isotherms provides selectivities above 4 for deuterium at 140 K, suggesting that VSB-5 is a promising adsorbent for pressure-swing adsorption type separations of hydrogen isotopes...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Jasmine Y Y Sze, Aleksandar P Ivanov, Anthony E G Cass, Joshua B Edel
The capability to screen a range of proteins at the single-molecule level with enhanced selectivity in biological fluids has been in part a driving force in developing future diagnostic and therapeutic strategies. The combination of nanopore sensing and nucleic acid aptamer recognition comes close to this ideal due to the ease of multiplexing, without the need for expensive labelling methods or extensive sample pre-treatment. Here, we demonstrate a fully flexible, scalable and low-cost detection platform to sense multiple protein targets simultaneously by grafting specific sequences along the backbone of a double-stranded DNA carrier...
November 16, 2017: Nature Communications
Jean Roman, Nathalie Jarroux, Gilles Patriarche, Olivier Francais, Juan Pelta, Bruno Le Pioufle, Laurent Bacri
Electrical detection based on single nanopores is an efficient tool to detect biomolecules, particles and study their morphology. Nevertheless the surface of the solid-state supporting the nanopore should be better controlled. Moreover, nanopore should be integrated within microfluidic architecture to facilitate control fluid exchanges. We built a reusable microfluidic system integrating a decorated membrane into a fluidic circuit, rendering the drain or refill of analytes and buffers easier. This process enhances strongly ionic conductance of the nanopore and its life-time...
November 16, 2017: ACS Applied Materials & Interfaces
Kun Li, Yi Tao, Zhongwu Li, Jingjie Sha, Yunfei Chen
By means of molecular dynamics (MD) simulations and density functional theory (DFT) calculations, we demonstrate that stretched and charged graphene can act as ion sieve membranes. It is observed that loading 30% strain on graphene can induce pores in the dense electron cloud to allow ions to pass through the aromatic rings. Meanwhile, charged surface is helpful to peel the hydration layers from the ions and decrease the energy barrier for ion translocation through nanopores. Our results suggest that with membrane charge density of 6...
November 16, 2017: Nanotechnology
Mordjane Boukhet, Niklas Felix König, Abdelaziz Al Ouahabi, Gerhard Baaken, Jean-François Lutz, Jan C Behrends
Nanopore analysis, which is, currently, chiefly used for DNA sequencing, is also an appealing technique for characterizing abiotic polymers. As a first step toward this goal, nanopore detection of non-natural monodispersed poly(phosphodiester)s as candidate backbone structures is reported herein. Two model homopolymers containing phosphopropyl repeat units (i.e., 56 or 104 r.u.) and a short thymidine nucleotide sequence are analyzed in the present work. They are tested in two different biological nanopores, α-hemolysin from Staphylococcus aureus, and aerolysin from Aeromonas hydrophila...
November 16, 2017: Macromolecular Rapid Communications
Yuan Gao, Yuanjing Lin, Zehua Peng, Qingfeng Zhou, Zhiyong Fan
Herein, a unique three-dimensionally interconnected nanoporous structure (3-D INPOS) pseudocapacitor electrode, which possesses a large surface area, an efficient electron and ion transport, together with a remarkable structural stability, has been constructed via soft anodization of an aluminum alloy, cost-effective ultrasonic spray pyrolysis (USP)-assisted deposition of fluorine-doped tin oxide (FTO), and controllable electrochemical deposition of nanostructured manganese dioxide (MnO2). Taking the advantage of large surface area, the as-built 3-D INPOS pseudocapacitor electrode exhibits the highest areal capacitance of 540 mF cm(-2) and a volumetric capacitance of 135 F cm(-3), which is 53% higher than that achieved from the conventional 3-D nanopore pseudocapacitor electrode and 17...
November 16, 2017: Nanoscale
Je Hyun Bae, Ricardo F Brocenschi, Kim Kisslinger, Huolin L Xin, Michael V Mirkin
The loss of Pt during the oxygen reduction reaction (ORR) affects the performance and economic viability of fuel cells and sensors. Our group previously observed the dissolution of Pt nanoelectrodes at moderately negative potentials during the ORR. Here we report a more detailed study of this process and identify its product. The nanoporous Pt surface formed during the ORR was visualized by AFM and high-resolution SEM, which also showed ∼5 nm sized Pt particles on the glass surface surrounding the electrode...
November 15, 2017: Analytical Chemistry
Kenya Kani, Victor Malgras, Bo Jiang, Md Shahriar A Hossain, Saad M Alshehri, Tansir Ahamad, Rahul R Salunkhe, Zhenguo Huang, Yusuke Yamauchi
Dendritic Pt nanospheres of 20 nm diameter are synthesized by using highly concentrated surfactant assembly within the large-sized cage-type mesopores of mesoporous silica (LP-FDU-12). After diluting the surfactant solution with ethanol, the lower viscosity lead to an improved penetration inside the mesopores. After Pt deposition followed by template removal, the arrangement of the Pt nanospheres is a replication from that of the mesopores in the original LP-FDU-12 template. Although it is well known that ordered LLCs can form on flat substrates, confined space inside the mesopores hinders surfactant self-organization...
November 14, 2017: Chemistry, An Asian Journal
Kai Xiao, Kai Wu, Lu Chen, Xiang-Yu Kong, Yuqi Zhang, Liping Wen, Lei Jiang
The controllable molecule transport is crucial to realize many highly valuable applications both in vivo and in vitro. Nanoporous membrane, with nanoscopic pores, high porosity, uniform pore dimension, and controllable surface chemical properties, hold tremendous potential to achieve this function. Here, we report a nano-gating system for on-demand molecule transport based on peptide-gated nanoporous membrane. Acting as gatekeeper, the peptides introduced to the nanoporous membrane provide an opportunity to realize on-demand on-off-states transport profiles via reversible conformational switch of peptides...
November 15, 2017: Angewandte Chemie
Antonio Tinti, Alberto Giacomello, Yaroslav Grosu, Carlo Massimo Casciola
Heterogeneous systems composed of hydrophobic nanoporous materials and water are capable, depending on their characteristics, of efficiently dissipating (dampers) or storing ("molecular springs") energy. However, it is difficult to predict their properties based on macroscopic theories-classical capillarity for intrusion and classical nucleation theory (CNT) for extrusion-because of the peculiar behavior of water in extreme confinement. Here we use advanced molecular dynamics techniques to shed light on these nonclassical effects, which are often difficult to investigate directly via experiments, owing to the reduced dimensions of the pores...
November 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
Himanshu Joshi, Prabal K Maiti
Engineering the synthetic nanopores through lipid bilayer membrane to access the interior of a cell is a long persisting challenge in biotechnology. Here, we demonstrate the stability and dynamics of a tile-based 6-helix DNA nanotube (DNT) embedded in POPC lipid bilayer using the analysis of 0.2 μs long equilibrium MD simulation trajectories. We observe that the head groups of the lipid molecules close to the lumen cooperatively tilt towards the hydrophilic sugar-phosphate backbone of DNA and form a toroidal structure around the patch of DNT protruding in the membrane...
November 10, 2017: Nucleic Acids Research
Masao Sugawara
Artificial and natural lipid membranes that elicit transmembrane signaling is are useful as a platform for channel-based biosensing. In this account we summarize our research on the design of transmembrane signaling associated with lipid bilayer membranes containing nanopore-forming compounds. Channel-forming compounds, such as receptor ion-channels, channel-forming peptides and synthetic channels, are embedded in planar and spherical bilayer lipid membranes to develop highly sensitive and selective biosensing methods for a variety of analytes...
November 14, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Ming-Hsien Li, Yu-Syuan Yang, Kuo-Chin Wang, Yu-Hsien Chiang, Po-Shen Shen, Wei-Chih Lai, Tzung-Fang Guo, Peter Chen
A robust and recyclable monolithic substrate applying all-inorganic metal-oxide selective contact with nanoporous (np) Au:NiOx counter electrode is successfully demonstrated for efficient perovskite solar cells, of which the perovskite active layer is deposited in the final step for device fabrication. Through annealing of the Ni/Au bilayer, the nanoporous NiO/Au electrode is formed in virtue of interconnected Au network embedded in oxidized Ni. By optimizing the annealing parameters and tuning the mesoscopic layer thickness (mp-TiO2 and mp-Al2O3), a decent PCE of 10...
November 14, 2017: ACS Applied Materials & Interfaces
Taejung Lim, Moonchang Sung, Jongwon Kim
Nanoporous electrodes have received great attention because of their unique electrochemical properties. Here, the electrocatalytic oxygen evolution reaction (OER) activities at porous Pt layers with pore dimensions in the microporous range were examined. The OER activity of the porous Pt layers in acidic media increased as the porosity of the Pt layers increased, and the highest OER activity possessed an overpotential that was 270 mV lower than that of a bulk flat electrode. The porous Pt layers did not exhibit electrocatalytic enhancement for OER in basic media, wherein the surface area of the pores was not utilized for OER...
November 13, 2017: Scientific Reports
Xinyue Zhang, Dong Zhang, Chenhan Zhao, Kai Tian, Ruicheng Shi, Xiao Du, Andrew J Burcke, Jing Wang, Shi-Jie Chen, Li-Qun Gu
The chemical properties and biological mechanisms of RNAs are determined by their tertiary structures. Exploring the tertiary structure folding processes of RNA enables us to understand and control its biological functions. Here, we report a nanopore snapshot approach combined with coarse-grained molecular dynamics simulation and master equation analysis to elucidate the folding of an RNA pseudoknot structure. In this approach, single RNA molecules captured by the nanopore can freely fold from the unstructured state without constraint and can be programmed to terminate their folding process at different intermediates...
November 13, 2017: Nature Communications
Hossein Sojoudi, Sanha Kim, Hangbo Zhao, Rama Kishore Annavarapu, Dhanushkodi Mariappan, A John Hart, Gareth H McKinley, Karen K Gleason
Scalable manufacturing of structured materials with engineered nanoporosity is critical for applications in energy storage devices (i.e. batteries and supercapacitors) and wettability control of surfaces (i.e. superhydrophobic and superomniphobic surfaces). Patterns formed in arrays of vertically aligned carbon nanotubes (VA-CNTs) have been extensively studied for these applications. However, the as-deposited features are often undesirably altered upon liquid infiltration and evaporation due to capillarity-driven aggregation of the low density CNTs...
November 13, 2017: ACS Applied Materials & Interfaces
Muhammad Shuja Khan, Noura Sayed Dosoky, Ghulam Mustafa, Darayas Patel, Bakhrom K Berdiev, John Dalton Williams
Nanopore-based technologies are highly adaptable supports for developing label-free sensor chips to characterize lipid bilayers, membrane proteins and nucleotides. We utilized a single nanopore chip to study electrophysiology of epithelial Na+ channel (ENaC) incorporated in supported lipid membrane (SLM). An isolated nanopore was developed inside the silicon cavity followed by fusing large unilamellar vesicles (LUVs) of DPPS (1,2-dipalmitoyl-sn-glycero-3-phosphoserine) and DPPE (1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine) to produce a solvent-free SLM with giga-ohm (GΩ) sealed impedance...
November 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Rui Xiong, Ho Shin Kim, Shuaidi Zhang, Sunghan Kim, Volodymyr F Korolovych, Ruilong Ma, Yaroslava G Yingling, Canhui Lu, Vladimir V Tsukruk
The construction of multilength scaled hierarchical nanostructures from diverse natural components is critical in the progress toward all-natural nanocomposites with structural robustness and versatile added functionalities. Here, we report a spontaneous formation of peculiar "shish kebab" nanostructures with the periodic arrangement of silk fibroin domains along straight segments of cellulose nanofibers. We suggest that the formation of these shish kebab nanostructures is facilitated by the preferential organization of heterogeneous (β-sheets and amorphous silk) domains along the cellulose nanofiber driven by modulated axial distribution of crystalline planes, hydrogen bonding, and hydrophobic interactions as suggested by all-atom molecular dynamic simulations...
November 17, 2017: ACS Nano
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