نتایج جستجو برای: ordered nanoporous carbon

تعداد نتایج: 334661  

2004
Luc Piraux

Nanochemistry fabrication methods have improved remarkably over the last few years. Among the different strategies developed to elaborate nanomaterials, the templating method is one of the most attractive as it has proven to be reliable for the synthesis of arrays of nanowires and nanotubules of desired composition, sizes and aspect ratios. Chemical and electrochemical techniques are used for s...

Journal: :Physical review letters 2011
P McKenna A P L Robinson D Neely M P Desjarlais D C Carroll M N Quinn X H Yuan C M Brenner M Burza M Coury P Gallegos R J Gray K L Lancaster Y T Li X X Lin O Tresca C-G Wahlström

The effect of lattice structure on the transport of energetic (MeV) electrons in solids irradiated by ultraintense laser pulses is investigated using various allotropes of carbon. We observe smooth electron transport in diamond, whereas beam filamentation is observed with less ordered forms of carbon. The highly ordered lattice structure of diamond is shown to result in a transient state of war...

The mesoporous carbon (CMK-3) functionalized with ethylenediamine (EDA) has been synthesized (CMK-3-EDA) and applied as a new mesoporous adsorbent for removal of Cu(II) and Pb(II) cations from aqueous solutions. Nitrogen adsorption–desorption measurements (BET) show that surface area, pore size and pore volume of CMK-3 were significantly changed after amine modification. The BET surface area an...

Journal: :Nanoscale 2015
M Aramesh O Shimoni K Fox T J Karle A Lohrmann K Ostrikov S Prawer J Cervenka

Extracellular nucleic acids freely circulating in blood and other physiologic fluids are important biomarkers for non-invasive diagnostics and early detection of cancer and other diseases, yet difficult to detect because they exist in very low concentrations and large volumes. Here we demonstrate a new broad-range sensor platform for ultrasensitive and selective detection of circulating DNA dow...

2004
Luc Piraux

Nanochemistry fabrication methods have improved remarkably over the last few years. Among the different strategies developed to elaborate nanomaterials, the templating method is one of the most attractive as it has proven to be reliable for the synthesis of arrays of nanowires and nanotubules of desired composition, sizes and aspect ratios. Chemical and electrochemical techniques are used for s...

Journal: :Science 2004
Bruce J Hinds Nitin Chopra Terry Rantell Rodney Andrews Vasilis Gavalas Leonidas G Bachas

An array of aligned carbon nanotubes (CNTs) was incorporated across a polymer film to form a well-ordered nanoporous membrane structure. This membrane structure was confirmed by electron microscopy, anisotropic electrical conductivity, gas flow, and ionic transport studies. The measured nitrogen permeance was consistent with the flux calculated by Knudsen diffusion through nanometer-scale tubes...

2016
Haiming Cheng Changqing Hong Xinghong Zhang Huafei Xue Songhe Meng Jiecai Han

The desire for lightweight nanoporous materials with high-performance thermal insulation and efficient anti-ablation resistance for energy conservation and thermal protection/insulation has greatly motivated research and development recently. The main challenge to synthesize such lightweight materials is how to balance the relationship of low thermal conductivity and flame retardancy. Herein, w...

Journal: :Molecules 2018
Mohammad A Wahab Farzana Darain Nazrul Islam David James Young

Rice starch (RS-)based nano/mesoporous carbon (RSNMC) was prepared via a hard-templating route using cheap rice starch as a carbon source. XRD and TEM characterization indicated the formation of organized nanoporous RSNMC. Nitrogen absorption-desorption studies revealed a high surface area of up to 488 m²∙g-1, uniform pore size of 3.92 nm, and pore volume of 1.14 cm³∙g-1. A RSNMC-modified glass...

2012
M. P. Manahan

In this study, the performance and reaction location in a VRFB was investigated with a carbon paper electrode that was modified to include a thin layer of multi-walled carbon nanotubes. The nanotube layer was introduced into the electrode at locations on the negative and positive electrode nearest the membrane and nearest the flow field. Results with the nanotube layer on the positive electrode...

2004
Madhav Acharya Michael S. Strano Jonathan P. Mathews Simon J. L. Billinge Valeri Petkov

Nanoporous carbons (NPCs) are useful in adsorptive separations and catalysis, owing to their ability to discriminate between molecules on the basis of size and shape. This property arises from their narrow pore size distribution, which is typically centred at a size corresponding to 0.5nm. Despite this level of nanoregularity, there is no long-range order within these materials. Structural cohe...

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