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.

Low Velocity Impact Testing of Laminated Carbon Fiber/Carbon Nanotube Composites

2015 ◽  
Author(s):  
Jake E. Christoph ◽  
Colin M. Gregg ◽  
Jordan R. Raney ◽  
David A. Jack
Keyword(s):  
Carbon Nanotube ◽  
Energy Dissipation ◽  
Carbon Fiber ◽  
Crystalline Silicon ◽  
Fiber Composite ◽  
Weight Ratio ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Hierarchical Architecture ◽  
Vertically Aligned

Carbon fiber laminated thermoset composites have become the industry standard for applications dictating a high strength-to-weight ratio. However, the brittle nature of the carbon fiber composite structure limits its energy dissipation characteristics, often leading to catastrophic failure under low energy impact loadings. This research examines the potential effects of including vertically aligned multi-walled carbon nanotube forests within a layered laminate structure with the goal being to increase the energy dissipation of the structure with attention given to the increase in the aerial density as a result of including the insert. These nanotube forests are of interest due to their broader application in coupled scenarios requiring tenability of structural, thermal and electrical properties. These nanotube forests have unique energy dissipative effects due to their hierarchical architecture (see e.g., Dario et al. (2006), Zeng et al. (2010) and Raney et al. (2011)). We synthesize vertically aligned nanotubes (VACNTs) on a single crystalline silicon wafer. After separation with the wafer, the VACNTs are placed within a carbon fiber laminated structure prior to resin infusion using vacuum assisted resin transfer molding (VARTM). Drop tower tests similar to ASTM D7136 are performed on carbon fiber laminates, carbon fiber laminates with nanotube forests, and carbon fiber laminates with several alternative materials. Results show an improved damage tolerance of the laminate with each of the investigated inserts, with the CNT system showing an increase of 13% in mean peak force. These results show a similar improvement to the alternative inserts while maintaining the potential for their broader application as a multifunctional material.

Fabrication of Carbon Nanotube Triode Using Helicon Plasma Cvd with Electroplated Nico Catalyst

2003 ◽  
Vol 772 ◽  
Author(s):  
Masakazu Muroyama ◽  
Kazuto Kimura ◽  
Takao Yagi ◽  
Ichiro Saito
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Metal Catalyst ◽  
Ni Catalyst ◽  
Plasma Cvd ◽  
Helicon Plasma ◽  
Plasma Enhanced Cvd ◽  
Turn On ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

AbstractA carbon nanotube triode using Helicon Plasma-enhanced CVD with electroplated NiCo catalyst has been successfully fabricated. Isolated NiCo based metal catalyst was deposited at the bottom of the cathode wells by electroplating methods to control the density of carbon nanotubes and also reduce the activation energy of its growth. Helicon Plasma-enhanced CVD (HPECVD) has been used to deposit nanotubes at 400°C. Vertically aligned carbon nanotubes were then grown selectively on the electroplated Ni catalyst. Field emission measurements were performed with a triode structure. At a cathode to anode gap of 1.1mm, the turn on voltage for the gate was 170V.

Evaluation of the maturity level of biomass electricity generation technologies using the technology readiness level criteria

2021 ◽  
Vol 295 ◽  
pp. 126426
Author(s):  
Fernando Bruno Dovichi Filho ◽  
York Castillo Santiago ◽  
Electo Eduardo Silva Lora ◽  
José Carlos Escobar Palacio ◽  
Oscar Agustin Almazan del Olmo
Keyword(s):  
Electricity Generation ◽  
Technology Readiness ◽  
Maturity Level ◽  
Technology Readiness Level ◽  
Readiness Level

scholarly journals Improving the robustness of a service robot for continuous indoor monitoring: An incremental approach

2021 ◽  
Vol 18 (3) ◽  
pp. 172988142110121
Author(s):  
David Portugal ◽  
André G Araújo ◽  
Micael S Couceiro
Keyword(s):  
Real World ◽  
Service Robots ◽  
Service Robot ◽  
Technology Readiness ◽  
Incremental Approach ◽  
Technology Readiness Level ◽  
Readiness Level ◽  
Software And Hardware ◽  
Indoor Monitoring

To move out of the lab, service robots must reveal a proven robustness so they can be deployed in operational environments. This means that they should function steadily for long periods of time in real-world areas under uncertainty, without any human intervention, and exhibiting a mature technology readiness level. In this work, we describe an incremental methodology for the implementation of an innovative service robot, entirely developed from the outset, to monitor large indoor areas shared by humans and other obstacles. Focusing especially on the reliability of the fundamental localization system of the robot in the long term, we discuss all the incremental software and hardware features, design choices, and adjustments conducted, and show their impact on the performance of the robot in the real world, in three distinct 24-h long trials, with the ultimate goal of validating the proposed mobile robot solution for indoor monitoring.

scholarly journals Electrokinetics of scalable, electric-field-assisted fabrication of vertically aligned carbon-nanotube/polymer composites

2015 ◽  
Vol 117 (21) ◽  
pp. 214306 ◽  
Author(s):  
Richard J. Castellano ◽  
Cevat Akin ◽  
Gabriel Giraldo ◽  
Sangil Kim ◽  
Francesco Fornasiero ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Polymer Composites ◽  
Vertically Aligned

Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays

2005 ◽  
Vol 109 (35) ◽  
pp. 16684-16694 ◽  
Author(s):  
Gyula Eres ◽  
Anika A. Kinkhabwala ◽  
Hongtao Cui ◽  
David B. Geohegan ◽  
Alexandar A. Puretzky ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Molecular Beam ◽  
Nucleation And Growth ◽  
Nanotube Arrays ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Carbon Nanotube Arrays ◽  
Vertically Aligned ◽  
Controlled Nucleation

scholarly journals Simulation and Optimization of a Carbon Nanotube Electron Source

2015 ◽  
Vol 21 (S4) ◽  
pp. 60-65 ◽  
Author(s):  
Alexandr Knápek ◽  
Tomáš Radlička ◽  
Stanislav Krátký
Keyword(s):  
Carbon Nanotube ◽  
Electron Beam Lithography ◽  
Fabrication Method ◽  
Vertically Aligned Carbon Nanotubes ◽  
Simulation And Optimization ◽  
Gate Structure ◽  
Aligned Carbon Nanotubes ◽  
Electric Behavior ◽  
Vertically Aligned ◽  
Structure Calculations

AbstractThis paper deals with an optimization of a field-emission structure concept based on vertically aligned carbon nanotubes (CNT). A design concept for a fabrication method for a gate structure based on electron beam lithography is reviewed in the first part of the paper. A single carbon nanotube is grown by the PECVD method inside the gate structure. Calculations and simulations that help determine gate structure proportions in order to obtain the best possible electron reduced brightness and to predict the cathode's electric behavior are also essential parts of this study.

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