A numerical-analytical methodology for acquiring the electrical force of carbon nanotube-based nanoactuator assuming an out-of-plane electrodes arrangement

2017 ◽  
Vol 31 (3) ◽  
pp. e2300 ◽  
Author(s):  
Hassen M. Ouakad
Keyword(s):  
Carbon Nanotube ◽  
Analytical Methodology ◽  
Electrical Force ◽  
Out Of Plane

scholarly journals Thermal Resistance across Interfaces Comprising Dimensionally Mismatched Carbon Nanotube-Graphene Junctions in 3D Carbon Nanomaterials

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Jungkyu Park ◽  
Vikas Prakash
Keyword(s):  
Carbon Nanotube ◽  
Thermal Resistance ◽  
Carbon Nanomaterials ◽  
Single Layer ◽  
Unit Cell ◽  
Single Layer Graphene ◽  
Interfacial Thermal Resistance ◽  
Layer Graphene ◽  
Out Of Plane ◽  
Plane Direction

In the present study, reverse nonequilibrium molecular dynamics is employed to study thermal resistance across interfaces comprising dimensionally mismatched junctions of single layer graphene floors with (6,6) single-walled carbon nanotube (SWCNT) pillars in 3D carbon nanomaterials. Results obtained from unit cell analysis indicate the presence of notable interfacial thermal resistance in the out-of-plane direction (along the longitudinal axis of the SWCNTs) but negligible resistance in the in-plane direction along the graphene floor. The interfacial thermal resistance in the out-of-plane direction is understood to be due to the change in dimensionality as well as phonon spectra mismatch as the phonons propagate from SWCNTs to the graphene sheet and then back again to the SWCNTs. The thermal conductivity of the unit cells was observed to increase nearly linearly with an increase in cell size, that is, pillar height as well as interpillar distance, and approaches a plateau as the pillar height and the interpillar distance approach the critical lengths for ballistic thermal transport in SWCNT and single layer graphene. The results indicate that the thermal transport characteristics of these SWCNT-graphene hybrid structures can be tuned by controlling the SWCNT-graphene junction characteristics as well as the unit cell dimensions.

scholarly journals Study on Lightweight and Strengthening Effect of Carbon Nanotube in Highly Ordered Nanoporous Nickel: A Molecular Dynamics Study

2019 ◽  
Vol 9 (2) ◽  
pp. 352 ◽  
Author(s):  
Yu Zhou ◽  
Wu-Gui Jiang ◽  
Duo-Sheng Li ◽  
Qing-Hua Qin
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Tensile Modulus ◽  
Md Simulations ◽  
Absorption Capacity ◽  
Atomic Scale ◽  
Strengthening Effect ◽  
Pore Collapse ◽  
Out Of Plane

The mechanical behavior of nanocomposites consisting of highly ordered nanoporous nickel (HONN) and its carbon nanotube (CNT)-reinforced composites (CNHONNs) subjected to a high temperature of 900 K is investigated via molecular dynamics (MD) simulations. The study indicates that, out-of-plane mechanical properties of the HONNs are generally superior to its in-plane mechanical properties. Whereas the CNT shows a significant strengthening effect on the out-of-plane mechanical properties of the CNHONN composites. Compared to pure HONNs, through the addition of CNTs from 1.28 wt‰ to 5.22 wt‰, the weight of the composite can be reduced by 5.83‰ to 2.33% while the tensile modulus, tensile strength, compressive modulus and compressive strength can be increased by 2.2% to 8.8%, 1% to 5.1%, 3.6% to 10.2% and 4.9% to 10.7%, respectively. The energy absorption capacity can also be improved due to the existence of CNTs. Furthermore, the MD simulations provide further insights into the deformation mechanism at the atomic scale, including fracture in tension, pore collapse in compression and local changes in lattice structures due to stacking faults.

scholarly journals Out-of-plane mosaic of single-wall carbon nanotube films

2004 ◽  
Vol 84 (12) ◽  
pp. 2172-2174 ◽  
Author(s):  
W. Zhou ◽  
K. I. Winey ◽  
J. E. Fischer ◽  
T. V. Sreekumar ◽  
S. Kumar ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Out Of Plane ◽  
Nanotube Films

scholarly journals Out-of-plane bending of carbon nanotube films

2017 ◽  
Vol 106-107 ◽  
pp. 183-199 ◽  
Author(s):  
Fei Pan ◽  
Yuli Chen ◽  
Yilun Liu ◽  
Zaoyang Guo
Keyword(s):  
Carbon Nanotube ◽  
Out Of Plane ◽  
Plane Bending ◽  
Nanotube Films

scholarly journals Thermal Transport Properties of Dry Spun Carbon Nanotube Sheets

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Heath E. Misak ◽  
James L. Rutledge ◽  
Eric D. Swenson ◽  
Shankar Mall
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Thermal Transport ◽  
Transport Theory ◽  
Primary Concern ◽  
Potential Candidate ◽  
Ir Camera ◽  
Dry Spinning ◽  
Out Of Plane ◽  
Plane Direction

The thermal properties of carbon nanotube- (CNT-) sheet were explored and compared to copper in this study. The CNT-sheet was made from dry spinning CNTs into a nonwoven sheet. This nonwoven CNT-sheet has anisotropic properties in in-plane and out-of-plane directions. The in-plane direction has much higher thermal conductivity than the out-of-plane direction. The in-plane thermal conductivity was found by thermal flash analysis, and the out-of-plane thermal conductivity was found by a hot disk method. The thermal irradiative properties were examined and compared to thermal transport theory. The CNT-sheet was heated in the vacuum and the temperature was measured with an IR Camera. The heat flux of CNT-sheet was compared to that of copper, and it was found that the CNT-sheet has significantly higher specific heat transfer properties compared to those of copper. CNT-sheet is a potential candidate to replace copper in thermal transport applications where weight is a primary concern such as in the automobile, aircraft, and space industries.

VERTICALLY-ALIGNED CARBON NANOTUBE (VACNT)-REINFORCEMENT FOR STRENGTH AND LIFE ENHANCEMENT OF COMPOSITE AEROSTRUCTURES

2021 ◽  
Author(s):  
PRANAV D. SHAH, ◽  
RICHARD LI
Keyword(s):  
Carbon Nanotube ◽  
Composite Laminates ◽  
Experimental Testing ◽  
Weight Ratio ◽  
Technology Readiness Level ◽  
Out Of Plane ◽  
Readiness Level ◽  
Vertically Aligned ◽  
Airframe Structures ◽  
Strength And Stiffness

Laminated composites used in lightweight airframe structures offer higher in-plane strength and stiffness to weight ratio when compared with metals but suffer from weaker out-of-plane properties. Using a building-block approach, vertically-aligned carbon nanotube (VACNT) reinforcement technology is evaluated for its efficacy in enhancing the through-thickness properties of composite laminates necessary for reducing the weight, improving the damage tolerance and extending the fatigue life of composite airframe structures. With additional insight into how VACNT reinforcement performance scales, it is anticipated that the conclusion of this evaluation will facilitate the increase in the technology readiness level (TRL) of VACNT-applications for composite airframes from three to four [1]. The content of this document includes information relevant to the planning and fabrication activities of the program, with experimental testing of articles forthcoming.

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

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