{"id":1323,"date":"2010-12-22T10:17:57","date_gmt":"2010-12-22T03:17:57","guid":{"rendered":"https:\/\/nano2.toolsmkt.com\/?p=1323"},"modified":"2010-12-22T10:17:57","modified_gmt":"2010-12-22T03:17:57","slug":"surfactants-separate-cnts","status":"publish","type":"post","link":"https:\/\/www.nanotec.or.th\/en\/surfactants-separate-cnts\/","title":{"rendered":"Surfactants separate CNTs"},"content":{"rendered":"<p>When carbon nanotubes are produced, they come in a mix of \u201cchiralities\u201d (or handedness) with varying electronic properties. However, the nanotubes need to be rich in one chirality if they are to be used to make devices. <!--more-->Using computer simulations, researchers at the University of Oklahoma in the US now suggest that certain surfactants could effectively separate out bundles of nanotubes in which the carbon atoms are then all arranged in the same way. Single-chiral tubes might be used in applications as diverse as drug delivery, biosensors and in high-performance electronics.<\/p>\n<div>\n<div><a title=\"Simulation snapshots for SDS aggregates  on two approaching SWNTs at low SDS surface coverage.  The SWNTs are separated by 6.90 angstroms. Green, red, and yellow  spheres represent methyl groups, oxygen, and sulphur  atoms of SDS, respectively. Blue spheres represent sodium  ions. Carbon atoms in nanotubes are connected with bold  grey lines. Water is not shown for clarity. Courtesy: &lt;i&gt;ACS Nano&lt;\/a&gt;\" href=\"http:\/\/images.iop.org\/objects\/ntw\/news\/9\/12\/13\/AStriolo.jpg\"><img decoding=\"async\" title=\"The simulations\" src=\"http:\/\/images.iop.org\/objects\/ntw\/news\/thumb\/9\/12\/13\/AStriolo.jpg\" alt=\"The simulations\" \/><\/a><br \/>\n<a title=\"Simulation snapshots for SDS aggregates  on two approaching SWNTs at low SDS surface coverage.  The SWNTs are separated by 6.90 angstroms. Green, red, and yellow  spheres represent methyl groups, oxygen, and sulphur  atoms of SDS, respectively. Blue spheres represent sodium  ions. Carbon atoms in nanotubes are connected with bold  grey lines. Water is not shown for clarity. Courtesy: &lt;i&gt;ACS Nano&lt;\/a&gt;\" href=\"http:\/\/images.iop.org\/objects\/ntw\/news\/9\/12\/13\/AStriolo.jpg\">The simulations<\/a><\/div>\n<p>A single-walled carbon nanotube (SWCNT) is a sheet of carbon just one atom thick rolled up into a tube that has a diameter of about 1 nm. The atoms in the sheet are arranged in a hexagonal lattice. The relative orientation of the lattice to the axis of the tube, or its chirality, determines whether the tube is a metal or a semiconductor and so what type of electronic properties it has.<\/p>\n<p>SWCNTs are ideal for use in a variety of applications, such as sensors and transistors, thanks to their extremely high surface area and excellent charge transport properties. However, to make such devices, the tubes need to be rich in one chirality. This is difficult to achieve.<\/p>\n<p><strong>Increasing nanotube repulsion<\/strong><br \/>\nNow, Alberto Striolo and colleagues say that surfactants, such as sodium cholate and flavin mononucleotide (FMN) could efficiently separate out SWCNTs based on diameter and chirality. Using molecular dynamics simulations, the researchers related the structure of the surfactant adsorbed on aqueous nanotubes to the effective repulsion\/attraction between the tubes. They suggest that increasing the repulsion between individual nanotubes yields more stable dispersions of single-chiral tubes. Based on these theoretical simulations, Striolo says he and his team can now start designing molecules to make dispersions containing only the nanotubes they are interested in.<\/p>\n<p>\u201cAlthough the technique is not yet ready, our strategy is clear \u2013 we will design small molecules of surfactants that form aggregates with well-defined morphologies on nanotubes as a function of tube diameter and chirality,\u201d he explained.<\/p>\n<p>The researchers say that the aqueous surfactant aggregates should be rigid and that the hydrophilic parts of the surfactants (the parts that like to remain in contact with water) should be as far away as possible from the nanotubes. Such a recipe should produce nanotubes of the desired diameter and chirality.<\/p>\n<p>The team is now busy designing such optimal surfactants. \u201cWe are building a library to describe the behaviour of several known surfactants,\u201d Striolo told <em>nanotechweb.org<\/em>. \u201cSome of these surfactants are known to be effective in stabilising nanotube dispersions \u2013 for example, FMN, sodium dodecyl benzene sulphonate and bile salts \u2013 while others are not (sodium dodecyl sulphate).\u201d<\/p>\n<p>The work was published in <em>ACS Nano<\/em>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>When carbon nanotubes are produced, they come in a mix of \u201cchiralities\u201d (or handedness) with varying electronic properties. However, the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[34],"tags":[],"class_list":["post-1323","post","type-post","status-publish","format-standard","hentry","category-technology-update"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Surfactants separate CNTs - National Nanotechnology Center<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nanotec.or.th\/en\/surfactants-separate-cnts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Surfactants separate CNTs - National Nanotechnology Center\" \/>\n<meta property=\"og:description\" content=\"When carbon nanotubes are produced, they come in a mix of \u201cchiralities\u201d (or handedness) with varying electronic properties. 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