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Nano tubes

Zhanyu Wang, Xinran Cao, Chong Qiao, R J Zhang, Y X Zheng, L Y Chen, S Y Wang, C Z Wang, K M Ho, Yuan-Jia Fan, Bih-Yaw Jin, Wan-Sheng Su
Research into novel one-dimensional (1D) materials and associated structural transitions is of significant scientific interest. It is widely accepted that a 1D system with a short-range interaction cannot have 1D phase transition at finite temperature. Herein, we propose a series of new stable carbon nanotubes by rolling up penta-graphene sheets, which exhibit fascinating well-defined 1D phase transitions triggered by axial strain. Our first-principles calculations show that such penta-graphene nanotubes (PGNTs) are dynamically stable by phonon calculations, but transform from a tri-layer structure to a highly defective single-walled nanotube at low temperature in molecular dynamics simulations...
December 1, 2017: Nanoscale
A K Singh Deb, S Pahan, K Dasgupta, S Panja, A K Debnath, P S Dhami, Sk M Ali, C P Kaushik, J S Yadav
The manuscript presents the results on the sorption of U(VI), Am(III) & Eu(III) from pH medium by a novel amido-amine functionalized multiwalled carbon nanotube (MWCNT). The novel functional group was introduced in the MWCNT by two step processes and characterized by various instrumental techniques like Scanning Electron Microscopy (SEM), Raman and X-ray Photoelectron Spectroscopy (XPS). The sorption process was found to be highly dependent on the pH of the solution with maximum sorption for both 233U, 241Am & 152+154Eu at pH 7...
November 2, 2017: Journal of Hazardous Materials
Minki Lee, Hosub Lim, Jinkee Lee
Plants transport water from roots to leaves via xylem through transpiration, which is an evaporation process that occurs at the leaves. During transpiration, suction pressure is generated by the porous structure of mesophyll cells in the leaves. Here, we fabricate artificial leaf consisting of micro and nano hierarchy structures similar to the mesophyll cells and veins of a leaf using cryo-gel method. We show that the microchannels in agarose gel greatly decrease the flow resistance in dye diffusion and permeability experiments...
November 7, 2017: Scientific Reports
N Ramakrishnan, Y Wang, D M Eckmann, P S Ayyaswamy, R Radhakrishnan
We study the motion of a buoyant or a nearly neutrally buoyant nano-sized spheroid in a fluid filled tube without or with an imposed pressure gradient (weak Poiseuille flow). The fluctuating hydrodynamics approach and the deterministic method are both employed. We ensure that the fluctuation-dissipation relation and the principle of thermal equipartition of energy are both satisfied. The major focus is on the effect of the confining boundary. Results for the velocity and the angular velocity autocorrelations (VACF and AVACF), the diffusivities and the drag and the lift forces as functions of the shape, the aspect ratio, the inclination angle and the proximity to the wall are presented...
June 25, 2017: Journal of Fluid Mechanics
Xi Yang, Wei Guo, Xixi Wang, Mingdun Liao, Pingqi Gao, Jichun Ye
2D metallic arrays with binary nanostructures derived from a nanosphere lithography (NSL) method have been rarely reported. Here, we demonstrate a novel NSL strategy to fabricate highly ordered 2D gold arrays with disc-in-hole binary (DIHB) nanostructures in large scale by employing a sacrificing layer combined with a three-step lift-off process. The structural parameters of the resultant DIHB arrays, such as periodicity, hole diameter, disc diameter and thicknesses can be facilely controlled by tuning the nanospheres size, etching condition, deposition angle and duration, respectively...
November 24, 2017: Nanotechnology
V Akhavan Zanjani, K Tabari, S M Sheikh-Al-Eslamian, A N Abrandabadi
Introduction: Development of new pulp capping agents has paved the way towards the preservation of pulp vitality, which is an important goal in restorative dentistry. This study sought to assess the calcium ion release, pH and setting of mineral trioxide aggregate (MTA) Angelus, an experimental formulation of nano-hybrid MTA containing nano-SiO2, nano-Al2O3 and nano-TiO2 and MTA Angelus plus nano-oxides. Methods: In this experimental study, five specimens from each material were placed in polypropylene tubes and immersed in a flask containing deionized distilled water...
July 2017: Journal of Medicine and Life
Bappaditya Gole, Vladimir Stepanenko, Sabrina Rager, Matthias Grüne, Dana D Medina, Thomas Bein, Frank Würthner, Florian Beuerle
Despite significant progress in the synthesis of covalent organic frameworks (COFs), reports on a precise construction of template-free nano- and microstructures for such materials have been rare. In search of dye-containing porous materials, a novel conjugated framework DPP-TAPP-COF with enhanced absorption capability up to 800 nm has been synthesized utilizing reversible imine condensations between 5,10,15,20-tetrakis(4-aminophenyl)-porphyrin (TAPP) and a diketopyrrolopyrrole (DPP) dialdehyde derivative. Surprisingly, the obtained COF exhibited spontaneous aggregation into hollow microtubular assemblies with outer and inner tube diameters of around 300 and 90 nm...
October 26, 2017: Angewandte Chemie
Jianyun Liu, Xiuting Li, Christopher Batchelor-McAuley, Richard G Compton
As reported previously (Applied Materials Today 2017, 7, 239-245), the charge transfer to partially oxidized PANI nanotubes in electrochemical reactions is heavily limited due to the non-conductivity of the reduction/oxidation products. In this paper, the doping level of individual polyaniline (PANI) nanotubes was substantially enhanced using nitrite as an electron acceptor in sulphuric acid aqueous solution as recorded by the nano-impact method. The charge transferred to one single tube during reduction process is close to the theoretical value of 170±112 pC per tube (assuming 2-electron reduction for the PANI tubes studied), while the charge during PANI oxidation is dramatically decreased...
October 25, 2017: Chemistry: a European Journal
Xue Li, Jingyu Tang, Luhan Bao, Lin Chen, Feng F Hong
In order to improve property of bacterial nano-cellulose (BNC) to achieve the requirements of clinical application as small caliber vascular grafts, chitosan (CH) was deposited into the fibril network of the BNC tubes fabricated in unique Double-Silicone-Tube bioreactors. Heparin (Hep) was then chemically grafted into the BNC-based tubes using EDC/NHS crosslinking to improve performance of anticoagulation and endothelialization. Physicochemical and mechanical property, blood compatibility, and cytocompatibility were compared before and after compositing...
December 15, 2017: Carbohydrate Polymers
Zepeng Kang, Kailong Jiao, Jin Cheng, Ruiyun Peng, Shuqiang Jiao, Zongqian Hu
A novel three-dimensional (3D) carbon composite of PANI1600@CNTs with rhizobium-like structure is prepared by in-situ polymerization of aniline monomers around and along the functionalized carbon nanotubes (CNTs) and then carbonized at 1600°C for enzymatic biofuel cells (EBFCs). The SEM and TEM images clearly show that the carbonized PANI grew seamlessly on the surface of CNTs and presented the rhizobium-like structure. The carbonized PANI acts like conductive "glue" and connects the adjacent tubes together, which can assemble the CNTs into a 3D network...
October 7, 2017: Biosensors & Bioelectronics
Yuichiro Kunai, Albert Tianxiang Liu, Anton L Cottrill, Volodymyr B Koman, Pingwei Liu, Daichi Kozawa, Xun Gong, Michael S Strano
The concept of electrical energy generation based on asymmetric chemical doping of single-walled carbon nanotube (SWNT) papers is presented. We explore 27 small, organic, electron-acceptor molecules that are shown to tune the output open-circuit voltage (VOC) across three types of pristine SWNT papers with varying (n,m) chirality distributions. A considerable enhancement in the observed VOC, from 80 to 440 mV, is observed for SWNT/molecule acceptor pairs that have molecular volume below 120 Å(3) and lowest unoccupied molecular orbital (LUMO) energies centered around -0...
October 20, 2017: Journal of the American Chemical Society
Manas Pathak, Hyukmin Kweon, Milind Deo, Hai Huang
Type I kerogen was isolated from Green River Shale and characterized using SEM, TGA, DSC, and nitrogen adsorption. The swelling behavior of this kerogen with decane was analyzed using traditional test-tube swelling experiment and Dynamic Light Scattering. The TGA and DSC were used to analyze the thermodynamic behavior of decane that was sorbed in the kerogen and show that kerogen suppresses the boiling point of decane due to the effect of confinement. However, the suppression is larger when oil (a multicomponent mixture) was used, possibly due to the combined effect of differential uptake of components by kerogen (kerogen prefers and sorbs polars and aromatics more than saturates, leading to splitting of oil into a sorbed and a free phase) and confinement in nano pores...
October 2, 2017: Scientific Reports
David R Barbero, Nicolas Boulanger
Self-assembled percolated networks play an important role in many advanced electronic materials and devices. In nanocarbon composites, decreasing the percolation threshold ϕc is of paramount importance to reduce nanotube bundling, minimize material resources and costs, and enhance charge transport. Here we demonstrate that three-dimensional nanoconfinement in single-wall carbon nanotube/polymer nanocomposites produces a strong reduction in ϕc, reaching the lowest value ever reported in this system of ϕc ≈ 1...
October 24, 2017: ACS Nano
Xiang Xiao, Shuqiang Xu, Lin Li, Min Mao, Jinping Wang, Yanjun Li, Ziwei Wang, Fei Ye, Li Huang
Velvet antler (VA) is a precious traditional Chinese medicine that is capable of repeated regeneration. Based on the Chinese medicine theory of coordination the heart and kidneys, VA has been employed to treat heart diseases, including ischemic heart disease, heart failure, and arrhythmia. We examined the effects of VA proteins on primary cardiac microvascular endothelial cells (CMECs) that were subjected to ischemia-hypoxia (IH) to investigate their effects on and mechanism of action in the treatment of ischemic heart disease...
2017: Frontiers in Pharmacology
Rongrong Zhu, Zhaoqi Wang, Peng Liang, Xiaolie He, Xizhen Zhuang, Ruiqi Huang, Mei Wang, Qigang Wang, Yechang Qian, Shilong Wang
Vascular endothelial growth factor (VEGF) plays an important role in angiogenesis and is highly expressed in carcinoma, which make it an important target for tumor targeting therapy. Neuroblastoma is the main cause for cancer-related death in children. Like most solid tumors, it is also accompanied with the overexpression of VEGF. Doxorubicin Hydrochloride (DOX), a typical chemotherapeutic agent, exhibits efficient anticancer activities for various cancers. However, DOX, without targeting ability, usually causes severe damage to normal tissues...
November 2017: Acta Biomaterialia
Rad Sadri, Maryam Hosseini, S N Kazi, Samira Bagheri, Ali H Abdelrazek, Goodarz Ahmadi, Nashrul Zubir, Roslina Ahmad, N I Z Abidin
In this study, we synthesized covalently functionalized graphene nanoplatelet (GNP) aqueous suspensions that are highly stable and environmentally friendly for use as coolants in heat transfer systems. We evaluated the heat transfer and hydrodynamic properties of these nano-coolants flowing through a horizontal stainless steel tube subjected to a uniform heat flux at its outer surface. The GNPs functionalized with clove buds using the one-pot technique. We characterized the clove-treated GNPs (CGNPs) using X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM)...
July 17, 2017: Journal of Colloid and Interface Science
Jason K Streit, Jeffrey A Fagan, Ming Zheng
DNA-wrapped carbon nanotubes are a class of bionano hybrid molecules that have enabled carbon nanotube sorting, controlled assembly, and biosensing and bioimaging applications. The current method of synthesizing these hybrids via direct sonication of DNA/nanotube mixtures is time-consuming and not suitable for high-throughput synthesis and combinatorial sequence screening. Additionally, the direct sonication method does not make use of nanotubes presorted by extensively developed surfactant-based methods, is not effective for large diameter (>1 nm) tubes, and cannot maintain secondary and tertiary structural and functional domains present in certain DNA sequences...
September 11, 2017: Analytical Chemistry
Dorsa Dehghan Baniani, Reza Bagheri, Atefeh Solouk
Thermosensitive Chitosan hydrogels which can be injected into defects with minimally invasive approach were prepared. Also starch micro/nano particles were synthesized via water-in-oil (W/O) miniemulsion technique. The starch particles were incorporated into the chitosan hydrogel to prepare injectable thermosensitive hydrogel composites. Tube inverting method, compression tests, swelling studies, XRD, SEM, OM, DLS, UV-vis spectroscopy were used for investigations. Results revealed that increasing crosslinker and surfactant contents and stirring rate leads to particle size reduction...
October 15, 2017: Carbohydrate Polymers
Berta Esteban-Fernández de Ávila, Pavimol Angsantikul, Jinxing Li, Miguel Angel Lopez-Ramirez, Doris E Ramírez-Herrera, Soracha Thamphiwatana, Chuanrui Chen, Jorge Delezuk, Richard Samakapiruk, Valentin Ramez, Marygorret Obonyo, Liangfang Zhang, Joseph Wang
Advances in bioinspired design principles and nanomaterials have led to tremendous progress in autonomously moving synthetic nano/micromotors with diverse functionalities in different environments. However, a significant gap remains in moving nano/micromotors from test tubes to living organisms for treating diseases with high efficacy. Here we present the first, to our knowledge, in vivo therapeutic micromotors application for active drug delivery to treat gastric bacterial infection in a mouse model using clarithromycin as a model antibiotic and Helicobacter pylori infection as a model disease...
August 16, 2017: Nature Communications
P Serra-Mora, N Jornet-Martinez, Y Moliner-Martinez, P Campíns-Falcó
In-tube solid-phase microextraction (IT-SPME) coupled to miniaturized liquid chromatography (LC) techniques are attractive mainly due to the column efficiency improvement, sensitivity enhancement and reduction of solvent consumption. In addition, the nanomaterials based sorbents can play a key role in the improvement of the extraction efficiency taking into account their interesting physical and chemical properties. Thus, in this work the performance of IT-SPME coupled to nano LC (NanoLC) has been compared with the performance of IT-SPME coupled to capillary LC (CapLC) with similar configurations for the determination of polar triazines including their degradation products...
September 1, 2017: Journal of Chromatography. A
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