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154 results for “nanotube”
Data for: Simultaneously enhanced tenacity, rupture work, and thermal conductivity of carbon nanotubes fibers by raising effective tube portion
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Data from: Nanotube structure of AsPS4–xSex (x = 0, 1)
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Radiation Generation from an Array of Magnetized Anharmonic Carbon Nanotubes
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Carbon Nanotube-Based Chemiresistive Sensor Array for Dissolved Gases
<p>Abstract: Dissolved gases such as oxygen (DO) and ammonia (dNH3) are among the most consequential parameters for water quality assessment. Since the concentrations of DO and dNH3 are interdependent through the nitrogen cycle, simultaneous monitoring can be useful in many applications. For example, in wastewater treatment, aeration baths are used to adjust the rate of ammonia removal by the bioactive sludge. Here, we have developed a sensing array which can monitor dissolved molecular oxygen (DO) and dissolved un-ionized ammonia (dNH3) continuously and simultaneously. This was achieved by functionalizing two sensors made from single- walled carbon nanotube (SWCNT) films with two different molecules; phenyl-capped aniline tetramer (PCAT), and iron phthalocyanine (II) (FePc). It was found that the FePc-doped SWCNT (FePc@SWCNT) sensor demonstrated good sensitivity and selectivity to DO, compared to dNH3. Conversely, we found that the PCAT-doped SWCNT (PCAT@SWCNT) demonstrates greater sensitivity to ammonia. Investigating the effect of different PCAT salts as dopant, we describe the following series of sensor responses to ammonia: Chloride < Crotonate < Fumarate. Additionally, we coated our sensors with PDMS, which is selectively permeable to gases, over ionic species. Finally, using principal component analysis (PCA) and partial least square discriminant analysis, it was possible to discriminate between responses to DO and dNH3, with 100% accuracy. As a result, here, we have developed a compelling proof-of-concept for the use of a single sensing substrate, doped with molecules with distinct mechanisms of interaction with two different analytes, to simultaneously monitor concentrations of two dissolved gases, namely DO and dNH3. </p> <p> </p> <p>This repository contains dataset and code used in chemometric analysis.</p> <p>Dataset contained in dataset folder. Within the array_exp.csv file, "sensor366" represents the current data for a PCAT@SWCNT Fumarate sensor; "sensor353" represents a FePc@SWCNT sensor. The dO meter is a polarographic probe. Times for the ammonia additions and concentrations can be found in the Rmarkdown script.</p> <p>In the root directory, the renv.lock file can be found with required packages. Text outputs from code can also be found in the root directory.</p>
Formation of Tungsten Oxide Nanowires by Electron-Beam-Enhanced Oxidation of WS2 Nanotubes and Platelets_experimental dataset
<p>This dataset contains the raw underlying data for the paper "Formation of Tungsten Oxide Nanowires by Electron-Beam-Enhanced Oxidation of WS<sub>2</sub> Nanotubes and Platelets" available in open acess under DOI 10.5281/zenodo.2628233. The archive contains sub-folders corresponding to figures as they appear in the paper. </p>
Data from: Metabolic cross-feeding via intercellular nanotubes among bacteria
Bacteria frequently exchange metabolites by diffusion through the extracellular environment, yet it remains generally unclear whether bacteria can also use cell–cell connections to directly exchange nutrients. Here we address this question by engineering cross-feeding interactions within and between Acinetobacter baylyi and Escherichia coli, in which two distant bacterial species reciprocally exchange essential amino acids. We establish that in a well-mixed environment E. coli, but likely not A. baylyi, can connect to other bacterial cells via membrane-derived nanotubes and use these to exchange cytoplasmic constituents. Intercellular connections are induced by auxotrophy-causing mutations and cease to establish when amino acids are externally supplied. Electron and fluorescence microscopy reveal a network of nanotubular structures that connects bacterial cells and enables an intercellular transfer of cytoplasmic materials. Together, our results demonstrate that bacteria can use nanotubes to exchange nutrients among connected cells and thus help to distribute metabolic functions within microbial communities.
Raw Data for manuscript published at Nanomaterials, entitled: Asymmetrical Plasmon Distribution in Hybrid AuAg Hollow/Solid Coded Nanotubes
<p>.dm3 TEM, STEM and EELS raw data</p>
Metallic behavior of T-graphene nanotubes
<p>The band structure, density of states (DOS), and Pauli magnetic susceptibility (PMS) of T-graphene nanotubes (TGNT) with different chiralities and diameters are investigated using the tight-binding Hamiltonian model and the Green's function formalism. Two various edges are considered: zigzag and armchair (zTGNT and aTGNT). Both types of TGNTs show metallic behaviors regardless of their diameter. Additionally, Dirac points are observed in the band structure of aTGNTs, with their number increasing as the diameter of the nanotubes increases. Furthermore, with increasing the diameter of the tubes, additional sub-bands and van-Hove singularities appear in the band structure and DOS diagrams, respectively. As a result, the PMS curves exhibit a crossover and can be divided into two parts at different temperature ranges, namely high- and low-temperature. The metallic properties of both types of TGNTs are also demonstrated in the PMS curves, which is due to the proportionality of PMS with the DOS. Moreover, the convergence of the DOS curves towards the monolayer is clearly evident as the diameter of both types of TGNT increases to significant values.</p>
Electric-field-induced anion-π catalysis on carbon nanotubes in electrochemical microfluidic devices: Original Data
<p>Original data underlying the publication entitled "Electric-field-induced anion-π catalysis on carbon nanotubes in electrochemical microfluidic devices"</p> <p>1 Synthesis: synthetic procedures (notebook pages) and data (NMR, IR, MS) of compounds <strong>6</strong>–<strong>8</strong>, <strong>15</strong>, <strong>17</strong>, <strong>19</strong>, <strong>21</strong>–<strong>26</strong></p> <p>2 Catalysis in suspension: procedure (notebook pages) and HPLC chromatograms (for compounds <strong>6</strong> and <strong>8</strong>) or NMR spectra (for compound<strong> 9</strong>)</p> <p>3 Catalysis using electromicrofluidics: procedure (notebook pages) and HPLC chromatograms</p>
Dataset to Carbon nanotube field-effect transistor for resolving single-molecule aptamer-ligand binding kinetics
<p>Raw data of single molecular field effect transistor data from recordings of aptamer serotonin interactions.</p>
Metallic behavior of T-graphene nanotubes
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Data from: Metabolic cross-feeding via intercellular nanotubes among bacteria
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Deep desulfurisation performance of thiophene with deep eutectic solvents loaded carbon nanotubes composites
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Probing the Electrical Double Layer by Operando X-ray Photoelectron Spectroscopy through a Graphene-Carbon Nanotube Composite Window
<p>Supporting information for Molecular Dynamics NAMD 2.0 simulations of BPY1,4-TFSI-Li ionic liquid mixture encased in cuboid graphene box for graphene window double layer calculations presented in submitted manuscript to Eco Mat journal.</p> <p>The files contain new developed parameters for BPY1,3-TFSI force field based on Gaussian09 DFT calculations and relevant PDB and PSF and configuration files for NAMD runs at 0, 1 and 3Volt.</p> <p>Abstract: </p> <p>The electrical double layer is known to spontaneously form at the electrode-electrolyte interface, impacting many important chemical and physical processes as well as applications including electrocatalysis, electroorganic synthesis, nanomaterial preparation, energy storage, and even emulsion stabilization. However, it has been challenging to study this fundamental phenomenon at the molecular level because the electrical double layer is deeply “buried” by the bulk electrolyte solution. Here, we report a quantitative probing of the electrical double layer of ionic liquids from the solid side of a photoelectron-transparent graphene-carbon nanotube hybrid membrane electrode using X-ray photoelectron spectroscopy. The membrane window is ultrathin (~1.5 nm), large (~1 cm<sup>2</sup>), and robust, enabling a tight seal of the electrolyte and quantitative measurement with excellent photoelectron signals. By <em>operando</em>monitoring the population changes of cations and anions in response to the applied electrical potentials, we experimentally resolve the chemical structure and dynamics of the electrical double layer, which corroborate results from molecular dynamics simulations.</p>
Rapid and sensitive quantification of cellular associated multi-walled carbon nanotubes
<p>Datasets of "Rapid and sensitive quantification of cellular associated multi-walled carbon nanotubes".</p>
Data from: Dispersion, sedimentation, and aggregation of multi-walled carbon nanotubes as affected by single and binary mixed surfactants
Two commonly used dispersants octyl phenol ethoxylate (Triton X-100) and sodium dodecyl sulfate (SDS) were employed to explore the effects of single or mixed surfactants on the dispersion, sedimentation, and aggregation of multi-walled carbon nanotubes (MWCNTs). Nonionic surfactant TX100 showed much superior capability to anionic surfactant SDS in dispersing MWCNTs due to the benzene ring structure in its tail group. The addition of SDS reduced the adsorption of TX100 on the surface of MWCNTs and the consequent suspension of MWCNTs. The dispersing ability of TX100-SDS binary mixture was between those of individual SDS and TX100. The introduction of SDS greatly retarded the sedimentation and aggregation of suspended MWCNTs. The critical coagulation concentration (CCC) values of suspended MWCNTs dispersed by TX100 (2000 mg/L), SDS (2000 mg/L), and TX100-SDS (2000 mg/L of each component) were 48.6, 398, and 324 mM, respectively, for the Na+ treatments. The CCC values were much lower for Ca2+ treatments, which were 30.4 and 32.1 mM, respectively, for MWCNT dispersed by TX100 and TX100-SDS mixture. Overall, these results demonstrated that although the introduction of SDS did not improve the ability of TX100 in suspending MWCNTs, the suspensions exhibited more stable properties than those dispersed by TX100 alone. Our findings have important implications on the design of surfactant mixtures and the prediction on the behavior and fate of MWCNTs in water environment.
Data from: New MRI contrast agents based on silicon nanotubes loaded with superparamagnetic iron oxide nanoparticles
This article describes the preparation and fundamental properties of a new possible material as a MRI contrast agent based on the incorporation of preformed iron oxide nanocrystals into hollow silicon nanotubes. Specifically, superparamagnetic iron oxide nanoparticles Fe3O4 of two different average sizes (5 nm and 8 nm) were loaded into silicon nanotubes of two different shell thicknesses (40 nm and 70 nm). To achieve proper aqueous solubility, the nanotubes were functionalized with an outer polyethylene glycol (PEG)-diacid (600) moiety via an aminopropyl linkage. Relaxometry parameters r1 and r2 were measured, with the corresponding r2/r1 ratios in PBS confirming the expected negative contrast agent behaviour for these materials. For a given nanocrystal size, the observed r2 values are found to be inversely proportional to nanotube wall thickness, thereby demonstrating the role of nanostructured silicon template on associated relaxometry properties.
Data from: Halloysite nanotube-based electrospun ceramic nanofibre mat: a novel support for zeolite membranes
Some key parameters of supports such as porosity, pore shape and size are of great importance for fabrication and performance of zeolite membranes. In this study, we fabricated millimetre-thick, self-standing electrospun ceramic nanofibre mats and employed them as a novel support for zeolite membranes. The nanofibre mats were prepared by electrospinning a halloysite nanotubes/polyvinyl pyrrolidone composite followed by a programmed sintering process. The interwoven nanofibre mats possess up to 80% porosity, narrow pore size distribution, low pore tortuosity and highly interconnected pore structure. Compared with the commercial α-Al2O3 supports prepared by powder compaction and sintering, the halloysite nanotube-based mats (HNMs) show higher flux, better adsorption of zeolite seeds, adhesion of zeolite membranes and lower Al leaching. Four types of zeolite membranes supported on HNMs have been successfully synthesized with either in situ crystallization or a secondary growth method, demonstrating good universality of HNMs for supporting zeolite membranes.
Data from: High-performance single-walled carbon nanotube transparent conducting film fabricated by using low feeding rate of ethanol solution
We report floating catalyst chemical vapor deposition synthesis of single-walled carbon nanotubes (SWCNTs) for high performance transparent conducting films (TCFs) using low feeding rate of precursor solution. Herein, ethanol acts as carbon source, ferrocene and thiophene as catalyst precursor and growth promoter, respectively. By adopting a low feeding rate of 4 μl/min, the fabricated TCFs present one of the lowest sheet resistances of ca. 78 ohm/sq. at 90% transmittance. Optical characterizations demonstrate that the mean diameter of high quality SWCNTs is up to 2 nm. Additionally, electron microcopy observations provide the evidences that the mean length of SWCNT bundles is as long as 28.4 μm while the mean bundle diameter is only 5.3 nm. Moreover, very few CNT loops can be found in the film. Remarkably, the fraction of individual SWCNTs climbs up to 24.6%. All those morphology data account for the superior optoelectronic performance of our SWCNT TCFs.
Data from: Convenient fabrication of conjugated polymer semiconductor nanotubes and their application in organic electronics
Organic heterojunction is indispensable in organic electronic devices, such as organic solar cells (OSCs), organic light-emitting diodes (OLEDs) and so on. Fabrication of core-shell nanostructure provides feasible and novel way to prepare organic heterojunction, which is beneficial for miniaturization and integration of organic electronic devices. Fabrication of nanotubes which constitute the core-shell structure in large quantity is the key for the realization of application. In this work, a simple and convenient method to prepare nanotubes utilizing conjugated copolymer of perylene diimide and dithienothiophene (P(PDI-DTT)) was demonstrated. The relationship between preparation condition (solvent atmosphere, solution concentration and pore diameter of templates) and morphology of nanostructure was studied systematically. P(PDI-DTT) nanotubes could be fabricated in regular shape and large quantity by preparing the solution with appropriate concentration and placing Anodic Aluminum Oxide (AAO) template with nanopore diameter of 200 nm in the solvent atmosphere. The tubular structure was confirmed by scanning electron microscope (SEM). P(PDI-DTT) nanotubes exhibited electron mobility of 0.02 cm2V-1s–1 in field effect transistors under ambient condition. Light emitting nanostructures were successfully fabricated by incorporating tetraphenyl ethylene (TPE) into polymer nanotubes.
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.