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Nano tube

Ye-Eun Na, Dahye Shin, Kisun Kim, Changui Ahn, Seokwoo Jeon, Dongchan Jang
Density-strength tradeoff appears to be an inherent limitation for most materials and therefore design of cell topology that mitigates strength decrease with density reduction has been a long-lasting engineering pursue for porous materials. Continuum-mechanics-based analyses of mechanical responses of conventional porous materials with bending-dominated structures often give the density-strength scaling law following the power-law relationship with an exponent of 1.5 or higher, which consequentially determines the upper bound of the specific strength for a material to reach...
October 4, 2018: Small
Zhen Sang, Kai Ke, Ica Manas-Zloczower
Simultaneously achieving high piezoresistive sensitivity, stretchability and good electrical conductivity in conductive elas-tomer composites (CECs) with carbon nanofillers are crucial for stretchable strain sensor and electrode applications. Here, we report a facile and environmentally-friendly strategy to realize these three goals at once by using branched carbon nano-tubes, also known as carbon nanostructure (CNS). Inspired by the brick-wall structure, a robust segregated conductive net-work of CNS is formed in the thermoplastic polyurethane (TPU) matrix at very low filler fraction, which renders the compo-site very good electrical, mechanical and piezoresistive properties...
October 3, 2018: ACS Applied Materials & Interfaces
Rhys W Lodge, Graham A Rance, Michael W Fay, Andrei N Khlobystov
The evolution of individual palladium nanoparticle (PdNP) catalysts in graphitised nanofibres (GNF) in the liquid-phase Suzuki-Miyaura (SM) reaction has been appraised. The combination of identical location-transmission electron microscopy (IL-TEM) and a nano test tube approach allowed spatiotemporally continuous observations at the single nanoparticle level, revealing that migration and coalescence is the most significant pathway to coarsening of the nanocatalyst, rather than Ostwald ripening. IL-TEM gave unprecedented levels of detail regarding the movement of PdNP on carbon surfaces at the nanoscale, including size-dependent migration and directional movement, opening horizons for the optimisation of future catalysts through surface morphology design...
October 3, 2018: Nanoscale
Yan-Ling Liu, Rong Liu, Yu Qin, Quan-Fa Qiu, Zhen Chen, Shi-Bo Cheng, Wei-Hua Huang
Flexible electrochemical (EC) sensors have shown great prospect in epidermal detection for personal healthcare and disease diagnosis. However, no reports have been seen in flexible device for urea analysis in body fluids. Herein, we developed a flexible wearable EC sensor based on surface molecularly imprinted nanotubes for non-invasive urea monitoring with high selectivity in human sweat. The flexible EC sensor was prepared by electropolymerization of 3,4-ethylenedioxythiophene (EDOT) monomer on the hierarchical network of carbon nano-tubes (CNTs) and gold nanotubes (Au NTs) to imprint template molecule urea...
October 1, 2018: Analytical Chemistry
Oskar Staufer, Jochen E Hernandez B, Amin Rustom
Cell biology considers most animal tissues as assemblies of "individual" cells that rely on different contact-dependent communication mechanisms, including synapses, gap junctions or - a recent awareness - membrane nano- and microtubes. However, by protease-mediated singularization of dense 2D/ 3D cell cultures and tissue explants, we show here that cell collectives stay connected via a continuous meshwork of F-actin-based membrane tubes, resembling tunneling nanotube (TNT)-based networks observed between dispersed cell cultures...
September 21, 2018: Experimental Cell Research
Tatiana Abashina, Mikhail Vainshtein, Saara Korpela, Timo Korpela
Gelatin added in certain concentration into the density gradient mixtures allows to solidify and melt the gradient reversibly. Such a method was applied to separation of partially disintegrated Escherichia coli VKM B-125 cells in discontinuous sucrose gradient which was optimized to obtain small round "nano-cells" free from other cell components. Gelatin added to the sucrose solutions had the advantages: i) accurate gradient layers were formed, ii) gelatin did not interfere with the cells and sub-particles during centrifugation, iii) solidified gelatin allowed to cut out the separated cell components, and iv) gelatin allowed to prepare ready-made solidified gradient centrifugation tubes into storage...
September 5, 2018: Journal of Microbiological Methods
Hind El Hadri, Julien Gigault, Jiaojie Tan, Vincent A Hackley
Applications of asymmetrical flow field-flow fractionation (AF4) continue to expand rapidly in the fields of nanotechnology and biotechnology. In particular, AF4 has proven valuable for the separation and analysis of particles, biomolecular species (e.g., proteins, bacteria) and polymers (natural and synthetic), ranging in size from a few nanometers to several micrometers. The separation of non-spheroidal structures (e.g., rods, tubes, etc.) with primary dimensions in the nanometer regime, is a particularly challenging application deserving of greater study and consideration...
November 2018: Analytical and Bioanalytical Chemistry
Mona Mirzaeimoghri, Alejandro Morales Martinez, Alireza Panna, Eric E Bennett, Bertrand M Lucotte, Don L DeVoe, Han Wen
Hard x-ray lenses are useful elements in x-ray microscopy and in creating focused illumination for analytical applications such as x-ray fluorescence imaging. Recently, polymer compound refractive lenses for focused illumination in the soft x-ray regime (< 10 keV) have been created with nano-printing. However, there are no such lenses yet for hard x-rays, particularly of short focal lengths for benchtop microscopy. We report the first instance of a nano-printed lens for hard x-ray microscopy, and evaluate its imaging performance...
2018: PloS One
Ni Shen, Rui Zhang, Hao-Rui Zhang, Hao-Yang Luo, Wei Shen, Xin Gao, Da-Zhi Guo, Jie Shen
AIM: To investigate the effect of gold nanoparticles on retinal angiogenesis in vitro and in vivo , and to reveal the possible mechanism. METHODS: Seed growth method was used to synthesize gold nanoparticles (GNPs). The size, zeta potential, absorption spectrum and morphology of GNPs were identified using Malvern Nano-ZS, multimode reader (BioTek synergy2) and transmission electron microscope. Cell viability was analyzed using cell counting kit-8 method and cell growth was assessed with EdU kit...
2018: International Journal of Ophthalmology
Kecheng Cao, Thilo Zoberbier, Johannes Biskupek, Akos Botos, Robert L McSweeney, Abdullah Kurtoglu, Craig T Stoppiello, Alexander V Markevich, Elena Besley, Thomas W Chamberlain, Ute Kaiser, Andrei N Khlobystov
Catalysis of chemical reactions by nanosized clusters of transition metals holds the key to the provision of sustainable energy and materials. However, the atomistic behaviour of nanocatalysts still remains largely unknown due to uncertainties associated with the highly labile metal nanoclusters changing their structure during the reaction. In this study, we reveal and explore reactions of nm-sized clusters of 14 technologically important metals in carbon nano test tubes using time-series imaging by atomically-resolved transmission electron microscopy (TEM), employing the electron beam simultaneously as an imaging tool and stimulus of the reactions...
August 23, 2018: Nature Communications
Jianghong He, Cheng Sun, Zhongze Gu, Yumin Yang, Miao Gu, Chengbin Xue, Zhuoying Xie, Hechun Ren, Yongjun Wang, Yan Liu, Mei Liu, Fei Ding, Kam W Leong, Xiaosong Gu
It has been shown that material surface topography greatly affects cell attachment, growth, proliferation, and differentiation. However, the underlying molecular mechanisms for cell-material interactions are still not understood well. Here, two kinds of butterfly wings with different surface architectures were employed for addressing such an issue. Papilio ulysses telegonus (P.u.t.) butterfly wing surface is composed of micro/nanoconcaves, whereas Morpho menelaus (M.m.) butterfly wings are decorated with grooves...
September 11, 2018: ACS Nano
Laura-Jayne A Ellis, Anastasios G Papadiamantis, Stefan Weigel, Eugenia Valsami-Jones
The reliable quantification of nanomaterials (NMs) in complex matrices such as food, cosmetics and biological and environmental compartments can be challenging due to interactions with matrix components and analytical equipment (vials and tubing). The resulting losses along the analytical process (sampling, extraction, clean-up, separation and detection) hamper the quantification of the target NMs in these matrices as well as the compatibility of results and meaningful interpretations in safety assessments...
June 2018: Royal Society Open Science
Satoshi Yamaguchi, Renshirou Kani, Kazuma Kawakami, Manami Tsuji, Sayuri Inoue, Chunwoo Lee, Wakako Kiba, Satoshi Imazato
OBJECTIVE: The aim of this study was to evaluate long-term fatigue behavior using an in vitro step-stress accelerated life test (SSALT), and to determine the crack initiation point using in silico finite element analysis for computer-aided designed and manufactured (CAD/CAM) molar crowns fabricated from three commercial CAD/CAM resin composite blocks: Cerasmart (CS; GC, Tokyo, Japan), Katana Avencia Block (KA; Kuraray Noritake Dental, Niigata, Japan), and Shofu Block HC (HC; Shofu, Kyoto, Japan)...
October 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Feng Qiu, Hao-Tian Tong, Yu-Yang Gao, Qian Zou, Bai-Xin Dong, Qiang Li, Jian-Ge Chu, Fang Chang, Shi-Li Shu, Qi-Chuan Jiang
Bimodal hybrid in-situ nano-/micro-size TiC/Al composites were prepared with combustion synthesis of Al-Ti-C system and hot press consolidation. Attempt was made to obtain in-situ bimodal-size TiC particle reinforced dense Al matrix composites by using different carbon sources in the reaction process of hot pressing forming. Microstructure showed that the obtained composites exhibited reasonable bimodal-sized TiC distribution in the matrix and low porosity. With the increasing of the carbon nano tube (CNT) content from 0 to 100 wt...
July 25, 2018: Materials
Jishi Zhang, Wenqian Zhao, Huiwen Zhang, Zejie Wang, Chuanfang Fan, Lihua Zang
Carbon-based materials such as graphite, graphene, biochar, activated carbon, carbon cloth and nano-tube, and maghemite and magnetite carbons are capable for adsorbing chemicals onto their surfaces. Currently, this review is to highlight the relevance of carbons in enhancing hydrogen or methane production. Some key roles of carbons in improving cell growth, enrichment and activity, and accelerating their co-metabolisms were elaborated with regard to their effects on syntrophic communities, interspecies electron transfer, buffering capacity, biogas upgrading, and fertilizer nutrient retention and land application...
October 2018: Bioresource Technology
Jiraporn Chomanee, Surajit Tekasakul, Perapong Tekasakul, Masami Furuuchi
This research aims to investigate the effects of irradiation energy and residence time of soft X-ray irradiation in the decomposition of sixteen polycyclic aromatic hydrocarbons (PAHs) in smoke particles emitted from the Para rubber wood burning. The burning process was carried out in a tube furnace and the soft X-ray radiation used had a wave length of 0.13-0.41 nm. The irradiated (IR) and non irradiated (N-IR) smoke particles were collected simultaneously using a 10-stage Andersen sampler equipped with an inertial-filter stage (ANIF), in order to determine the physicochemical characteristic of both IR and N-IR smoke particles, including particle size distribution and concentration, and particle-bound PAHs concentration...
November 2018: Chemosphere
Guibo Rao, Yan Fu, Na Li, Jiayi Yin, Jie Zhang, Manli Wang, Zhihong Hu, Sheng Cao
Viruses with filamentous morphologies, such as tobacco mosaic virus (TMV) and M13 bacteriophage, have long been studied as multivalent nanoscaffolds for loading functional motifs. Structural assembly of the capsid proteins (CPs) of filamentous viruses often requires the presence of DNA or RNA molecules, which has limited their applications. Here, we describe a strategy for controllable assembly of flexible bio-nanotubes consisting of Escherichia coli expressed CP of baculovirus Helicoverpa armigera nucleopolyhedrovirus (HearNPV) in vitro...
August 1, 2018: ACS Applied Materials & Interfaces
Wen-Jiang Li, Li-Fang Yu, Rui Miao, Bai-Wen Ma
In recent years, the integrated ultrafiltration (UF) membrane process has been widely used due to its high removal efficiency, slight membrane fouling, and small land use. However, a number of problems gradually occurred regarding the integrated UF process caused by the granular adsorbents used, such as powdered activated carbon, carbon nano-tube, nanoscale zerovalent iron, etc. Severe membrane surface damage was easily caused by these granular adsorbents after a long running time, and the cost of most adsorbents was very high...
March 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Junyi Shen, Zhiming Zhao, Wei Shang, Chunli Liu, Beibei Zhang, Zihan Xu, Hui Cai
Cerebral infarction is with poorer prognosis and high rates of mortality. After cerebral infarction, the promoting angiogenesis can accelerate the recovery of neurological function. Long non-coding RNA (LncRNA) maternally expressed gene 3 (Meg3) was overexpressed in cerebral infarction area and the knockdown of Meg3 promotes neovascularization and improves nerve function. In this study, we fabricated a nano-polymer wrapped Meg3 short hairpin RNA (ShRNA) plasmid to knockdown Meg3 and conjugated with OX26 antibody (MPO) to realize the brain targeting for the treatment of cerebral infarction...
June 29, 2018: Artificial Cells, Nanomedicine, and Biotechnology
John Jankovic, Tracy L Zontek, Megan Moore, Burton R Ogle, Scott Hollenbeck
BACKGROUND: Due to the lack of standard industrial hygiene sampling protocols for collection of nano-scale materials, sampling inlet device selection is left to individual researchers and professionals. OBJECTIVE: The objective of this study was to compare nano-scale aspiration efficiency for common inlet configurations with that of an open-ended sampler tube that is a commonly used inlet for direct reading instruments such as a condensation particle counter. METHODS: A polydisperse aerosol was generated using an electric motor as the aerosol source...
June 14, 2018: International Journal of Occupational and Environmental Health
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