Application of Hybrid Fillers for Improving the Through-Plane Heat Transport in Graphite Nanoplatelet-Based Thermal Interface Layers.

The in-plane alignment of graphite nanoplatelets (GNPs) in thin thermal interface material (TIM) layers suppresses the though-plane heat transport thus limiting the performance of GNPs in the geometry normally required for thermal management applications. Here we report a disruption of the GNP in-plane alignment by addition of spherical microparticles. The degree of GNP alignment was monitored by measurement of the anisotropy of electrical conductivity which is extremely sensitive to the orientation of high aspect ratio filler particles. Scanning Electron Microscopy images of TIM layer cross-sections confirmed the suppression of the in-plane alignment. The hybrid filler formulations reported herein resulted in a synergistic enhancement of the through-plane thermal conductivity of GNP/Al2O3 and GNP/Al filled TIM layers confirming that the control of GNP alignment is an important parameter in the development of highly efficient GNP and graphene-based TIMs

Method of Solubilizing Single-Walled Carbon Nanotubes in Organic Solutions

Naked single-walled nanotube carbon metals and semiconductors are dissolved in various organic solutions

Method of Solubilizing Shortened Single-Walled Carbon Nanotubes in Organic Solutions

Naked single-walled nanotube carbon metals and semiconductors were dissolved in organic solutions by derivatization with SOCl2 and octadecylamine charge. Both ionic (charge transfer) and covalent solution phase chemistry with concomitant modulation of the single-walled carbon nanotubes (SWNT) band structure were demonstrated. Solution phase near-IR spectroscopy was used to study the effects of chemical modifications on the band gaps of the SWNTs. Reaction of solubilized SWNTs with dichlorocarbene led to functionalization of the nanotube walls

Solubilizing Single Walled Carbon Nanotubes by Direct Reaction with Amines and Alkylaryl Amines

Naked single-walled nanotube carbon metals and semiconductors are dissolved in organic solutions by direct functionalization with amines or alkylaryl amines having an uninterrupted carbon chain of at least 5 and more preferably 9 carbon atoms in length

Homoconjugation in Radical Cations

Recent studies of nuclear spin polarization effects in cyclopropane derivatives have provided considerable information on the structure as well as the spin and charge density distributions in this class of radical ca,tions. In the present work we report an extension of the frontier MO/perturbation MO theory of homoconjugation to include such species in an attempt to rationalize further the experimental results mentioned above, and to provide guidelines for understanding the structures of radical cations derived from other types of cyclopropane derivatives. The structures observed for the radical ca\u271:ions of diphenylcyclopropane, trimethylcyclopropane, and benzonorcaradiene are rationalized, and the structures of the radical cations of spirocyclopropanefluorene and vicinally cyclopolyene-substituted cyclopropanes are predicted

Method of Solubilizing Carbon Nanotubes in Organic Solutions

Carbon nanotubes are dissolved in organic solutions by attaching an aliphatic carbon chain (which may contain aromatic residues) so as to render the carbon nanotubes soluble

Method of Solubilizing Unshortened Carbon Nanotubes in Organic Solutions

Naked carbon nanotubes are dissolved in organic solutions by terminating the nanotubes with carboxylic acid groups and attaching an aliphatic carbon chain so as to render the carbon nanotubes soluble