The Experts below are selected from a list of 73962 Experts worldwide ranked by ideXlab platform
Gilbert Fantozzi - One of the best experts on this subject based on the ideXlab platform.
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multi walled Carbon Nanotube nanostructured zirconia composites outstanding mechanical properties in a wide range of temperature
Composites Science and Technology, 2011Co-Authors: Mehdi Mazaheri, Zohreh Razavi Hesabi, Robert Schaller, Daniele Mari, Gilbert FantozziAbstract:Multi-Walled Carbon Nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5–5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly attached to zirconia grains and in obtaining fully dense materials. Moreover, MWCNTs reduce grain growth and keep a nanosize structure. A significant improvement in room temperature fracture toughness and shear modulus as well as an enhanced creep performance at high temperature is reported for the first time in this type of materials. To support these interesting mechanical properties, high-resolution electron microscopy and mechanical loss measurements have been carried out. Toughening and creep hindering mechanisms are proposed. Moreover, an enhancement of the electrical conductivity up to 10 orders of magnitude is obtained with respect to the pure ceramics.
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Multi-Walled Carbon Nanotube/nanostructured zirconia composites: Outstanding mechanical properties in a wide range of temperature
Composites Science and Technology, 2011Co-Authors: Mehdi Mazaheri, Zohreh Razavi Hesabi, Robert Schaller, Daniele Mari, Gilbert FantozziAbstract:Multi-Walled Carbon Nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5-5. wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly attached to zirconia grains and in obtaining fully dense materials. Moreover, MWCNTs reduce grain growth and keep a nanosize structure. A significant improvement in room temperature fracture toughness and shear modulus as well as an enhanced creep performance at high temperature is reported for the first time in this type of materials. To support these interesting mechanical properties, high-resolution electron microscopy and mechanical loss measurements have been carried out. Toughening and creep hindering mechanisms are proposed. Moreover, an enhancement of the electrical conductivity up to 10 orders of magnitude is obtained with respect to the pure ceramics. © 2011 Elsevier Ltd.
Guo Qin Xu - One of the best experts on this subject based on the ideXlab platform.
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Dynamic mechanical behavior of in situ functionalized Multi-Walled Carbon Nanotube/phenoxy resin composite
Chemical Physics Letters, 2003Co-Authors: Guo Qin Xu, K P Pramoda, W.d. ZhangAbstract:In situ functionalized Multi-Walled Carbon Nanotube (MWNT)/Phenoxy composites were prepared by melt mixing Phenoxy with MWNT and 1-(aminopropyl)imidazole (NIm). Composites with 4.8 wt% or more of in situ functionalized MWNT show higher storage modulus than Phenoxy, provided a sufficient amount of NIm was used to aid in the dispersion of the hydrophobic MWNTs in the hydrophilic Phenoxy matrix.
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dynamic mechanical behavior of melt processed multi walled Carbon Nanotube poly methyl methacrylate composites
Chemical Physics Letters, 2001Co-Authors: K P Pramoda, Guo Qin XuAbstract:Multi-Walled Carbon Nanotube/poly(methyl methacrylate) composites have been fabricated by melt blending. The Nanotubes are well dispersed in the polymer matrix with no apparent damage or breakage. The dynamic mechanical behavior of the composites has been studied. The storage modulus of the polymer is significantly increased by the incorporation of Nanotubes particularly at high temperatures.
Mehdi Mazaheri - One of the best experts on this subject based on the ideXlab platform.
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multi walled Carbon Nanotube nanostructured zirconia composites outstanding mechanical properties in a wide range of temperature
Composites Science and Technology, 2011Co-Authors: Mehdi Mazaheri, Zohreh Razavi Hesabi, Robert Schaller, Daniele Mari, Gilbert FantozziAbstract:Multi-Walled Carbon Nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5–5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly attached to zirconia grains and in obtaining fully dense materials. Moreover, MWCNTs reduce grain growth and keep a nanosize structure. A significant improvement in room temperature fracture toughness and shear modulus as well as an enhanced creep performance at high temperature is reported for the first time in this type of materials. To support these interesting mechanical properties, high-resolution electron microscopy and mechanical loss measurements have been carried out. Toughening and creep hindering mechanisms are proposed. Moreover, an enhancement of the electrical conductivity up to 10 orders of magnitude is obtained with respect to the pure ceramics.
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Multi-Walled Carbon Nanotube/nanostructured zirconia composites: Outstanding mechanical properties in a wide range of temperature
Composites Science and Technology, 2011Co-Authors: Mehdi Mazaheri, Zohreh Razavi Hesabi, Robert Schaller, Daniele Mari, Gilbert FantozziAbstract:Multi-Walled Carbon Nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5-5. wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly attached to zirconia grains and in obtaining fully dense materials. Moreover, MWCNTs reduce grain growth and keep a nanosize structure. A significant improvement in room temperature fracture toughness and shear modulus as well as an enhanced creep performance at high temperature is reported for the first time in this type of materials. To support these interesting mechanical properties, high-resolution electron microscopy and mechanical loss measurements have been carried out. Toughening and creep hindering mechanisms are proposed. Moreover, an enhancement of the electrical conductivity up to 10 orders of magnitude is obtained with respect to the pure ceramics. © 2011 Elsevier Ltd.
Ray H. Baughman - One of the best experts on this subject based on the ideXlab platform.
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Temperature-Responsive Tensile Actuator Based on Multi-Walled Carbon Nanotube Yarn
Nano-Micro Letters, 2016Co-Authors: Márcio D. Lima, Ray H. BaughmanAbstract:Many temperature indicators or sensors show color changes for materials used in food and medical fields. However, they are not helpful for a color-blind person or children who lack judgment. In this paper, we introduce simply fabricated and more useful low-temperature indicator (~30 °C) for devices that actuates using paraffin-infiltrated Multi-Walled Carbon Nanotube (MWCNT) coiled yarn. The density difference of MWCNT yarn provides large strain (~330 %) when heat causes the melted polymer to move. Furthermore, the MWCNT yarn decreases the melting point of paraffin. These properties allow control of the actuating temperature. In addition, mechanical strength was enhanced by MWCNT than previously reported temperature-responsive actuators based on shape memory polymers. This simply fabricated temperature indicator can be applied in latching devices for medical and biological fields.
Qing Zhang - One of the best experts on this subject based on the ideXlab platform.
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fabrication of alizarin red s multi walled Carbon Nanotube nanocomposites and their application in hydrogen peroxide detection
Journal of Materials Science, 2013Co-Authors: Qing Zhang, Haitao Han, Haiyun Zhang, Dawei PanAbstract:In this work, an easy and effective method to synthesize alizarin red S/Multi-Walled Carbon Nanotube (ARS/MWCNT) nanocomposites based on the pi-pi stacking non-covalent interactions between ARS and MWCNTs was introduced. The characters of ARS/MWCNT nanocomposites were investigated by Fourier transformation infrared spectroscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope, and electrochemical techniques. ARS tightly coating on MWCNTs surface makes the nanocomposites good dispersibility in water and excellent electrochemical activity. Because of the combination of the excellent electroactivity of ARS and the unique properties of MWCNTs, ARS/MWCNT nanocomposites-modified glassy Carbon electrode exhibits a good response to the reduction of hydrogen peroxide and takes on a promising prospect of the practical application in electrochemical sensors field.
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multi walled Carbon Nanotube based gas sensors for nh3 detection
Diamond and Related Materials, 2004Co-Authors: S G Wang, Qing Zhang, D J Yang, P J Sellin, Guofang ZhongAbstract:Abstract Multi-Walled Carbon Nanotube (MWNT) based gas sensors for detecting gaseous molecules of ammonia (NH 3 ) were developed. MWNTs were prepared using microwave plasma-enhanced chemical vapor deposition. The gas sensors, in which the Nanotubes laid under the electrodes, were fabricated using electron-beam lithography and lift-off techniques. It is found that the conductance of MWNTs decreases when the sensors successively exposed to NH 3 gas at room temperature of 25 °C. The MWNT-based sensors are sensitive to NH 3 gas. This suggests that the MWNTs could be a good candidate material for NH 3 detection at room temperature.
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a novel multi walled Carbon Nanotube based biosensor for glucose detection
Biochemical and Biophysical Research Communications, 2003Co-Authors: S G Wang, Qing Zhang, Ruili Wang, S F YoonAbstract:The bioelectrochemical characteristics of a novel Multi-Walled Carbon Nanotube (MWNT)-based biosensor for glucose detection are studied and compared with those of glassy Carbon (GC)-based biosensor. The MWNT-based biosensor exhibits a strong glucose response at applied potentials of 0.65 and 0.45 V versus Ag/AgCl, respectively, while GC-based biosensor shows a weak glucose response at 0.65 V and no response at 0.45 V. Besides, the MWNT-based biosensor shows a high stability of 86.7% of the initial activity to glucose after four-month storage, much higher than 37.2%, the corresponding value for a GC-based biosensor. The detection mechanism of the MWNT-based biosensor is also discussed in detail.