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Nanopore

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https://www.readbyqxmd.com/read/28346432/nanoscale-capillary-freezing-of-ionic-liquids-confined-between-metallic-interfaces-and-the-role-of-electronic-screening
#1
Jean Comtet, Antoine Niguès, Vojtech Kaiser, Benoit Coasne, Lydéric Bocquet, Alessandro Siria
Room-temperature ionic liquids (RTILs) are new materials with fundamental importance for energy storage and active lubrication. They are unusual liquids, which challenge the classical frameworks of electrolytes, whose behaviour at electrified interfaces remains elusive, with exotic responses relevant to their electrochemical activity. Using tuning-fork-based atomic force microscope nanorheological measurements, we explore here the properties of confined RTILs, unveiling a dramatic change of the RTIL towards a solid-like phase below a threshold thickness, pointing to capillary freezing in confinement...
March 27, 2017: Nature Materials
https://www.readbyqxmd.com/read/28345938/mimicking-ph-gated-ionic-channel-by-polyelectrolyte-complex-confinement-inside-single-nanopore
#2
Yixuan Zhao, Jean-Marc Janot, Emmanuel Balanzat, Sebastien Balme
Biological channels have served as inspiration to design stimuli-response artificial nanopore. Here we propose an original approach to design pH-gate nanopore based on polyethylenimine and chondroitin-4-sulfate (ChS) layer-by-layer self-assembly. This approach is interesting because it is rapid and permits a monitoring in real time of functionalization. The study of ionic transport through these single nanopores reveals a selectivity on anions and pH-gate properties at low salt concentration. It is open at pH below 4 or 5 depending salt concentration...
March 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28345584/terahertz-and-mid-infrared-plasmons-in-three-dimensional-nanoporous-graphene
#3
Fausto D'Apuzzo, Alba R Piacenti, Flavio Giorgianni, Marta Autore, Mariangela Cestelli Guidi, Augusto Marcelli, Ulrich Schade, Yoshikazu Ito, Mingwei Chen, Stefano Lupi
Two-dimensional (2D) graphene emerged as an outstanding material for plasmonic and photonic applications due to its charge-density tunability, high electron mobility, optical transparency and mechanical flexibility. Recently, novel fabrication processes have realised a three-dimensional (3D) nanoporous configuration of high-quality monolayer graphene which provides a third dimension to this material. In this work, we investigate the optical behaviour of nanoporous graphene by means of terahertz and infrared spectroscopy...
March 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28345204/insight-into-ion-transfer-through-the-sub-nanometer-channels-in-zeolitic-imidazolate-frameworks
#4
Ze-Yu Jiang, Hai-Ling Liu, Saud Asif Ahmed, Sumaira Hanif, Shi-Bin Ren, Jing-Juan Xu, Hong-Yuan Chen, Xing-Hua Xia, Kang Wang
A crack-free sub-nanometer composite structure for the study of ion transfer was constructed by in situ growth of ZIF-90 [Zn(ICA)2 , ICA=Imidazole-2-carboxaldehyde] on the tip of a glass nanopipette. The potential-driven ion transfer through the sub-nanometer channels in ZIF-90 is strongly influenced by the pH of the solution. A rectification ratio over 500 is observed in 1 m KCl solution under alkaline conditions (pH 11.58), which is the highest value reported under such a high salt concentration. Fluorescence experiments show the super-high rectification ratio under alkaline conditions results from the strong electrostatic interaction between ions and the sub-nanometer channels of ZIF-90...
March 27, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28343130/computational-study-of-ibuprofen-removal-from-water-by-adsorption-in-realistic-activated-carbons
#5
Daniel Bahamon, Leticia Carro, Sonia Guri, Lourdes F Vega
Molecular simulations using the Grand Canonical Monte Carlo (GCMC) method have been performed in order to obtain physical insights on how the interaction between ibuprofen (IBP) and activated carbons (ACs) in aqueous mixtures affects IBP removal from water by ACs. A nanoporous carbon model based on units of polyaromatic molecules with different number of rings, defects and polar-oxygenated sites is described. Individual effects of factors such as porous features and chemical heterogeneities in the adsorbents are investigated and quantified...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28341327/importance-of-the-structure-and-nanoporosity-of-organic-matter-on-the-desorption-kinetics-of-benzo-a-pyrene-in-sediments
#6
Youda Huang, Dainan Zhang, Dandan Duan, Yu Yang, Yongqiang Xiong, Yong Ran
The desorption kinetics and mechanism were investigated using a Tenax extraction technique on different sediments spiked with radiocarbon-labeled benzo[a]pyrene (BaP). Five sedimentary fractions were sequentially fractionated, and the only nonhydrolyzable organic carbon fractions (NHC) were characterized using advanced solid-state (13)C nuclear magnetic resonance spectroscopy (NMR), improved six end-member model, and a CO2 gas adsorption technique. The sediments contained high percentages of algaenan and/or sporopollenin but low percentages of black carbon and lignin...
March 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28340755/single-molecule-transformation-and-analysis-of-glutathione-oxidized-and-reduced-in-nanopore
#7
Yongfeng Wei, Zhuoqun Su, Xiao-Feng Kang, Yanli Guo, Xiaoxue Mu
The determination of glutathione reduced (GSH) or oxidized (GSSG) in bulk solution has been reported previously. However, it is critically important to set up a simple and label-free method to recognize GSSG and GSH selectively and dynamically, especially at a single-molecule level. Here we report a novel nanopore method to recognize GSSG based on a newly synthesized per-6-quaternary ammonium-β-cyclodextrin (p-QABCD), which is used as both the molecular adaptor of protein nanopore and the recognizing element of GSSG...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28338408/clofazimine-encapsulation-in-nanoporous-silica-particles-for-the-oral-treatment-of-antibiotic-resistant-mycobacterium-tuberculosis-infections
#8
Sabrina Valetti, Xin Xia, Joana Costa-Gouveia, Priscille Brodin, Marie-Françoise Bernet-Camard, Margareta Andersson, Adam Feiler
AIM: First extensive reformulation of clofazimine (CLZ) in nanoporous silica particles (NSPs) for tackling antibiotic-resistant tuberculosis (TB) infections. MATERIALS & METHODS: Solid-state characterization of several CLZ-encapsulated NSP formulations was followed by in vitro drug solubility, Caco-2 intestinal cells drug permeability and TB antibacterial activity. RESULTS: NSPs stabilize the amorphous state of CLZ (shelf stability >6 months) and dramatically increase the drug solubility in simulated gastric fluid (up to 20-fold) with different dissolution kinetics depending on the NSPs used...
March 24, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28338003/directional-phonon-suppression-function-as-a-tool-for-the-identification-of-ultralow-thermal-conductivity-materials
#9
Giuseppe Romano, Alexie M Kolpak
Boundary-engineering in nanostructures has the potential to dramatically impact the development of materials for high- efficiency conversion of thermal energy directly into electricity. In particular, nanostructuring of semiconductors can lead to strong suppression of heat transport with little degradation of electrical conductivity. Although this combination of material properties is promising for thermoelectric materials, it remains largely unexplored. In this work, we introduce a novel concept, the directional phonon suppression function, to unravel boundary-dominated heat transport in unprecedented detail...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337073/real-time-dna-sequencing-in-the-antarctic-dry-valleys-using-the-oxford-nanopore-sequencer
#10
Sarah S Johnson, Elena Zaikova, David S Goerlitz, Yu Bai, Scott W Tighe
The ability to sequence DNA outside of the laboratory setting has enabled novel research questions to be addressed in the field in diverse areas, ranging from environmental microbiology to viral epidemics. Here, we demonstrate the application of offline DNA sequencing of environmental samples using a hand-held nanopore sequencer in a remote field location: the McMurdo Dry Valleys, Antarctica. Sequencing was performed using a MK1B MinION sequencer from Oxford Nanopore Technologies (ONT; Oxford, United Kingdom) that was equipped with software to operate without internet connectivity...
March 22, 2017: Journal of Biomolecular Techniques: JBT
https://www.readbyqxmd.com/read/28336897/three-dimensional-bioi-biox-x-cl-or-br-nanohybrids-for-enhanced-visible-light-photocatalytic-activity
#11
Yazi Liu, Jian Xu, Liqiong Wang, Huayang Zhang, Ping Xu, Xiaoguang Duan, Hongqi Sun, Shaobin Wang
Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption...
March 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335603/molecular-dynamics-simulation-of-water-transport-mechanisms-through-nanoporous-boron-nitride-and-graphene-multilayers
#12
Majid Shahbabaei, Daejoong Kim
In this study, molecular dynamics simulations are used to investigate water transport mechanisms through hourglass-shaped pore structure in nanoporous boron nitride (BN) and graphene multilayers. An increase in water flux is evidenced as the gap between the layers increases, reaching a maximum of 41 and 43 at d=6 Å in BN and graphene multilayers, respectively. Moreover, the BN multilayer exhibits less flux compared to graphene due to large friction force and energy barrier. In BN, the friction force dramatically increases when the layers are strongly stacked (d=3...
March 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28335341/design-and-electrochemical-study-of-platinum-based-nanomaterials-for-sensitive-detection-of-nitric-oxide-in-biomedical-applications
#13
REVIEW
Maduraiveeran Govindhan, Zhonggang Liu, Aicheng Chen
The extensive physiological and regulatory roles of nitric oxide (NO) have spurred the development of NO sensors, which are of critical importance in neuroscience and various medical applications. The development of electrochemical NO sensors is of significant importance, and has garnered a tremendous amount of attention due to their high sensitivity and selectivity, rapid response, low cost, miniaturization, and the possibility of real-time monitoring. Nanostructured platinum (Pt)-based materials have attracted considerable interest regarding their use in the design of electrochemical sensors for the detection of NO, due to their unique properties and the potential for new and innovative applications...
November 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335237/dna-sequencing-by-hexagonal-boron-nitride-nanopore-a-computational-study
#14
Liuyang Zhang, Xianqiao Wang
The single molecule detection associated with DNA sequencing has motivated intensive efforts to identify single DNA bases. However, little research has been reported utilizing single-layer hexagonal boron nitride (hBN) for DNA sequencing. Here we employ molecular dynamics simulations to explore pathways for single-strand DNA (ssDNA) sequencing by nanopore on the hBN sheet. We first investigate the adhesive strength between nucleobases and the hBN sheet, which provides the foundation for the hBN-base interaction and nanopore sequencing mechanism...
June 6, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334395/pore-guis-for-parallel-and-real-time-processing-of-minion-sequence-data
#15
Robert Stewart, Mick Watson
Motivation: Oxford Nanopore's MinION device has matured rapidly and is now capable of producing over one million reads and several gigabases of sequence data per run. The nature of the MinION output requires new tools that are easy to use by scientists with a range of computational skills and which enable quick and simple QC and data extraction from MinION runs. Results: We have developed two GUIs for the R package poRe that allow parallel and real-time processing of MinION datasets...
March 9, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28334071/on-the-design-and-prospects-of-direct-rna-sequencing
#16
Georgi K Marinov
Throughout the past nearly a decade, the application of high-throughput sequencing to RNA molecules in the form of RNA sequencing (RNA-seq) and its many variations has revolutionized transcriptomic studies by enabling researchers to take a simultaneously deep and truly global look into the transcriptome. However, there is still considerable scope for improvement on RNA-seq data in its current form, primarily because of the short-read nature of the dominant sequencing technologies, which prevents the completely reliable reconstruction and quantification of full-length transcripts, and the sequencing library building protocols used, which introduce various distortions in the final data sets...
February 17, 2017: Briefings in Functional Genomics
https://www.readbyqxmd.com/read/28333410/pd-metalated-conjugated-nanoporous-polycarbazoles-for-additive-free-cyanation-of-aryl-halides-boosting-catalytic-efficiency-via-spatial-modulation
#17
Shunmin Ding, Chengcheng Tian, Xiang Zhu, Carter W Abney, Ziqi Tian, Bo Chen, Meijun Li, De-En Jiang, Ning Zhang, Sheng Dai
A novel spatial-modulation approach was developed to fabricate a new heterogeneous Pd-metalated nanoporous polymer for efficient and ligand-free cyanation of aryl halides. The resulting catalyst displays high activity in the synthesis of benzonitriles, including high product yield, excellent stability and recycle, and broad scope functional group tolerance.
March 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28332664/kinetics-of-ozone-decomposition-in-porous-in2o3-monoliths
#18
Danielle Klawinski, Christian Weinberger, Dominik Klaus, Jan-Henrik Smått, Michael Tiemann, Thorsten Wagner
The performance of many chemical gas-phase reactions is strongly influenced by the interaction of reactants with interfaces. Nanoporous materials, which exhibit pore diameters up to 100 nm and high specific surface areas, can be utilized to reduce the amount of cost-intensive materials (e.g. noble metals). However, due to limitations in material transport and reaction kinetics detailed knowledge of the diffusion and the kinetics of a chemical reaction is necessary to improve the performance of chemical processes in industry and research...
March 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28332478/addressed-immobilization-of-biofunctionalized-diatoms-on-electrodes-by-gold-electrodeposition
#19
S Leonardo, D Garibo, M Fernández-Tejedor, C K O'Sullivan, M Campàs
Diatoms are single cell microalgae with a silica shell (frustule), which possess a micro/nanoporous pattern of unparalleled diversity far beyond the possibilities of current micro- and nanofabrication techniques. To explore diatoms as natural three-dimensional nanostructured supports in sensing and biosensing devices, a simple, rapid and stable method to immobilize diatoms via gold electrodeposition is described. In this process, gold microstructures are formed, immobilizing diatoms by entrapment or crossing their nanopores...
March 23, 2017: Biofabrication
https://www.readbyqxmd.com/read/28327976/minion%C3%A2-nanopore-sequencing-of-environmental-metagenomes-a-synthetic-approach
#20
Bonnie L Brown, Mick Watson, Samuel S Minot, Maria C Rivera, Rima B Franklin
Background: Environmental metagenomic analysis is typically accomplished by assigning taxonomy and/or function from whole genome sequencing (WGS) or 16S amplicon sequences. Both of these approaches are limited, however, by read length, among other technical and biological factors. A nanopore-based sequencing platform, MinION™, produces reads that are ≥1×10 4 bp in length, potentially providing for more precise assignment, thereby alleviating some of the limitations inherent in determining metagenome composition from short reads...
February 24, 2017: GigaScience
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