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Aligned Carbon Nanotubes (aligned + carbon_nanotube)

Distribution by Scientific Domains
Polymers and Materials Science77%

Selected Abstracts

A Combined Process of In Situ Functionalization and Microwave Treatment to Achieve Ultrasmall Thermal Expansion of Aligned Carbon Nanotube,Polymer Nanocomposites: Toward Applications as Thermal Interface Materials

ADVANCED MATERIALS, Issue 23 2009
Wei Lin
Ultrasmall thermal expansion of aligned carbon nanotube,epoxy composites at temperatures below and above the glass transition is achieved by a novel combined process of in situ functionalization and microwave treatment. Carbon nanotube,polymer interfacial bonding is the key to the reduced thermal expansion, enhanced storage modulus, and improved thermal conductivity. [source]

Laser-Induced Rapid Carbon Nanotube Micro-Actuators

ADVANCED FUNCTIONAL MATERIALS, Issue 5 2010
Zhi Han Lim
Abstract Laser-induced rapid actuating microstructures made of aligned carbon nanotube (CNT) arrays are achieved. Desirable operational features of the CNT micro-actuators include low laser power activation, rapid response, elastic and reversible motion, and robust durability. Experimental evidence suggests a laser-induced electrostatic interaction mechanism as the primary cause of the optomechanical phenomenon. Oscillating CNT micro-actuators up to 40,kHz are achieved by driving them with a modulated laser beam. The micro-actuators are utilized in exerting a sub-micro-Newton force to bend nanowires. Electrical coupling of the micro-actuator and feasibilities of multi-actuator systems made entirely out of CNTs are also demonstrated. [source]

Fast High-Temperature Response of Carbon Nanotube Film and Its Application as an Incandescent Display

ADVANCED MATERIALS, Issue 35 2009
Peng Liu
Super aligned carbon nanotube (CNT) film shows a fast high-temperature response: the film can be heated to incandescence and cools down in about 1 ms. Using screen printing and laser cutting, an incandescent CNT film array that can dynamically display Chinese characters is fabricated. More applications of the film may be developed based on its fast response. [source]

A Combined Process of In Situ Functionalization and Microwave Treatment to Achieve Ultrasmall Thermal Expansion of Aligned Carbon Nanotube,Polymer Nanocomposites: Toward Applications as Thermal Interface Materials

ADVANCED MATERIALS, Issue 23 2009
Wei Lin
Ultrasmall thermal expansion of aligned carbon nanotube,epoxy composites at temperatures below and above the glass transition is achieved by a novel combined process of in situ functionalization and microwave treatment. Carbon nanotube,polymer interfacial bonding is the key to the reduced thermal expansion, enhanced storage modulus, and improved thermal conductivity. [source]

Biosensors Based on Aligned Carbon Nanotubes Coated with Inherently Conducting Polymers

ELECTROANALYSIS, Issue 13 2003
Mei Gao
Abstract The use of multiwalled aligned carbon nanotubes provides a novel electrode platform for inherently conducting polymer based biosensors. The example used here to highlight the usefulness of such a platform is the polypyrrole based glucose oxidase system for detection of glucose. The use of these three dimensional electrodes offers advantages in that large accessible enzyme loadings can be obtained within an ultrathin layer. It has also been found that the detection of H2O2 at these new electrode structures containing iron loaded nanotube tips can be achieved at low anodic potentials. The result is a sensitive and selective glucose sensor. [source]

Nanostructured pillars based on vertically aligned carbon nanotubes as the stationary phase in micro-CEC

ELECTROPHORESIS, Issue 12 2009
Ren-Guei Wu
Abstract We present a micro-CEC chip carrying out a highly efficient separation of dsDNA fragments through vertically aligned multi-wall carbon nanotubes (MWCNTs) in a microchannel. The vertically aligned MWCNTs were grown directly in the microchannel to form straight nanopillar arrays as ordered and directional chromatographic supports. 1-Pyrenedodecanoic acid was employed for the surface modification of the MWCNTs' stationary phase to adsorb analytes by hydrophobic interactions. This device was used for separating dsDNA fragments of three different lengths (254, 360, and 572,bp), and fluorescence detection was employed to verify the electrokinetic transport in the MWCNT array. The micro-CEC separation of the three compounds was achieved in less than 300,s at a field strength of 66,V/cm due to superior laminar flow patterns and a lower flow resistance resulting from the vertically aligned MWCNTs being used as the stationary phase medium. In addition, a fivefold reduction of band broadening was obtained when the analyte was separated by the chromatographic MWCNT array channel instead of the CE channel. From all of the results, we suggest that an in situ grown and directional MWCNT array can potentially be useful for preparing more diversified forms of stationary phases for vertically efficient chip-based electrochromatography. [source]

Carbon Nanotubes Anchored to Silicon for Device Fabrication

ADVANCED MATERIALS, Issue 5 2010
Kristina T. Constantopoulos
Abstract This report highlights recent progress in the fabrication of vertically aligned carbon nanotubes (VA-CNTs) on silicon-based materials. Research into these nanostructured composite materials is spurred by the importance of silicon as a basis for most current devices and the disruptive properties of CNTs. Various CNT attachments methods of covalent and adsorptive nature are critically compared. Selected examples of device applications where the VA-CNT on silicon assemblies are showing particular promise are discussed. These applications include field emitters, filtration membranes, dry adhesives, sensors and scaffolds for biointerfaces. [source]

Energy-Absorbing Hybrid Composites Based on Alternate Carbon-Nanotube and Inorganic Layers

ADVANCED MATERIALS, Issue 28 2009
Qiang Zhang
Hybrid materials with aligned carbon nanotubes intercalating naturally layered compounds (see upper figures) are fabricated using general metal-ion intercalation and in situ growth. As indicated by SEM images (lower figures), they exhibit periodic and hierarchical structures. The ability to control their composition resulted in some samples possessing excellent mechanical properties, such as high energy absorption during compression. [source]

Fabrication and Nanocompression Testing of Aligned Carbon-Nanotube,Polymer Nanocomposites,

ADVANCED MATERIALS, Issue 16 2007
J. García
The reinforcement of fiber,polymer composites with arrays of aligned carbon nanotubes (CNTs) is reported. Nanocomposite features containing vertically aligned CNTs and a commercially available polymer are fabricated and mechanically characterized with a direct nanocompression method using a flat punch mounted on a nanoindenter (see figure). The results show a reinforcement of 220,% at a CNT volume fraction of 2,%. [source]