Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Vertically aligned Carbon Nanotubes"”.
-
Characterization and performance of vertically-aligned carbon nanotubes in capacitive deionization systems
… and salt removal rates into porous, tortuous carbon electrodes is still low. Previously, a breadth of carbon material electrodes have been investigated for CDI, due to their high surface area to volume ratio, high conductivity and non-corrosive property in salt water. However, many carbon …
-
Design of a miniature high-speed carbon-nanotube-enhanced ultracapacitor for electronics applications
… consumer electronics. As a potential alternative vertically aligned carbon nanotubes are utilized to create miniature high-speed ultracapacitors. Because the nanotubes are grown on silicon using low pressure chemical vapor deposition, this technique also opens the possibility of high-value …
-
Miniaturized electron-impact-ionization pumps using double-gated isolated vertically aligned carbon nanotube arrays
… source that is an array of double-gated isolated vertically aligned carbon nanotubes (VA-CNTs), an electronimpact- ionization region, and a non-evaporative ion-implantation getter. Single-gated VA-CNT FEAs were tested as field emitters in high vacuum (10-9 Torr). The current density of the tested …
-
Quantitative mapping of nanothermal transport via Scanning Thermal Microscopy
… measurements of a wide range of materials from vertically aligned carbon nanotubes to metal covered block copolymers. In brief, we probed the 3D thermal properties distribution of isotropic and anisotropic materials, such as optoelectronic thin film. We also measured low dimensional systems of …
-
Nanoporous elements in microfluidics for multi-scale separation of bioparticles
… address these challenges. This work introduces Vertically Aligned Carbon Nanotubes (VACNTs) as a new porous material in microfluidics, and demonstrates the different ways in which it can improve bioparticle separation across both the micro and nano size scales. Our devices are fabricated by …
-
Direct Growth of Carbon Nanotubes on Inconel Sheets Using Hot Filament Chemical Vapor Deposition
Carbon nanotubes (CNTs) have great potential in many applications due to their unique structure and properties. However, there are still many unsolved problems hampering their real applications. This thesis focuses on three important issues limiting their applications, namely: (1) direct growth of …
-
Fabrication and inorganic Modification of 3D Carbon Nanotube Structures for Applications in Energy Storage
… electrodes are fabricated by creating 3D carbon-inorganic hybrid architectures. In this process, patterned vertically aligned carbon nanotubes (CNT) were used as the structural scaffolds to shape the electrodes while inheriting the excellent thermal and electrical properties of CNTs. …
-
Using electrochemical impedance spectroscopy to characterize vertically-aligned carbon nanotube forest porosimetry
Carbon nanotubes have generated much research interest and potential applications due to their unique properties such as their high tensile strength, high thermal conductivity, and unique semiconductor properties. Vertically-aligned carbon nanotubes (VA-CNTs) have been used in applications for …
-
Improvements on carbon nanotube structures in high-energy density ultracapacitor electrode design
… the focus of this research, is a dense forest of vertically-aligned carbon nanotubes (CNTs). Previous work at MIT has projected that such structures could augment the energy density of ultracapacitors by a factor of five over existing packaged devices. This thesis is an investigation into the …
-
Micro-computed tomography for interlaminar analysis, void quantification, and feature localization in carbon fiber composites
… unidirectional prepreg aerospace-grade carbon fiber reinforced plastic (CFRP) laminated composites. The interlaminar thickness tool locates the interlaminar region and calculates its thickness at each voxel, and the porosity tool quantifies the void volume fraction and localizes each …
-
Towards Thick Battery Electrodes and Interdigitated Cell Architectures Via Micro-structured Carbon Nanotube Forests
… “honeycomb” battery electrodes using patterned, vertically aligned carbon nanotubes (VA-CNTs) on metal foils as current collectors. We translate insights from CNT growth on silicon wafer substrates to grow CNT forests over 250 μm tall on thin metal foils (Cu) that are suitable for electrode …
-
Nanomaterial-Enabled Out-of-Autoclave and Out-of-Oven Manufacturing of Fiber Reinforced Polymer Composites
… (GFRP) unidirectional prepreg. It was shown that vertically aligned carbon nanotubes (VA-CNTs), electrospun polymer nanofiber (EPN) veils, and polyimide (PI) aerogel thin films may each successfully evacuate voids via capillary-pressure enhanced polymer flow, as the laminate was void-free. A …
-
Hydrodynamic interactions of complex fluids and fibrous media
… microfluidic device incorporating fixed beds of carbon nanotubes for filtration of specific biomarkers from biological fluid samples. Therefore, the focus is centered on defining and evaluating an interception efficiency, which provides a measure of the fraction of fluid streamlines that …
-
Vertically-aligned carbon nanotube membranes for water desalination and ultrafiltration
… (quantum dots), different polymers or novel carbon structures like Carbon Nanotube (CNTs) or Graphene. CNTs doped in polymer is the best choice for fabrication of these novel membranes. A combination of the CNTs and hydrophobic polymer is the best combination for the mixed matrix class of …
-
3D MEMS via (post-) buckling of micromachined structures and integration of bulk nanoporous elements in microfluidic devices
… elements comprised of nanoporous forests of vertically-aligned carbon nanotubes (VACNTs) in MEMS is demonstrated, particularly their use in microfluidic applications for bioparticle manipulation. Introduction of porous materials in microfluidic devices significantly benefits MEMS by providing …