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 11 of 11 for “"Superacid"”.
-
Characterisation and development of carbon nanotube macrostructures
… a CNT fibre-twisting process in conjunction with superacid (acids with pKa <-10) treatments. The resultant fibres showed up to a 386% increase in specific electrical conductivity and up to a 106% increase in specific strength compared to the base material, which is comparable to the best acid …
-
Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… defects, which are not introduced by the superacid treatment; rather, the superacid treatment dramatically reduces nonradiative recombination through these states, extending the exciton lifetime and increasing the likelihood of eventual radiative recombination. In the second half of …
-
Electronic structure, defect formation and passivation of 2D materials
… 2D MoS2. We found that in the most successful superacid bis(trifluoromethane) sulfonamide (TFSI) treatment, H is the passivation agent. A symmetric adsorption geometry of 3H in the -1 charge state can remove all gap states and return the Fermi level to the midgap.
-
Chemical and Physical Modifications of Semicrystalline Gels to Achieve Controlled Heterogeneity
… levels. Moreover, Ullmann coupling introduced superacidic perfluorosulfonic acid side chains to the BrPEEK backbone, which yielded membranes with less water content and less dimensional swelling than random SPEEK. Superior proton transport than random SPEEK was observed due to the superacid …
-
Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… poly(tetrafluoroethylene)-PEEK polymer blends. Superacid-modified PEEK was synthesized through a similar methodology and demonstrated over 50,000% increased hygroscopicity relative to the parent homopolymer, and exhibited preserved crystallizability. Multiphase systems were also designed to …
-
Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing
… matching the performance obtained when using superacid solvents. Additionally, pToS gently solidifies upon exposure to ambient moisture, enabling 3D-printing neat structures with commercially available equipment.
-
Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication
… which compares to HiPco SWCNT fibers spun from superacid solutions, and conductivity 2 × 104 S/m. Our method provides an acid-free alternative towards high performance carbon nanotube fibers, which can be expanded for the production of other materials such as films. Also, we expanded our …
-
Electrochemical studies in anhydrous formic acid
… in it are even more deserving of the term superacid than those acetic acid solutions in which the pioneer work on the potentiometric investigation of strongly acid solvents was done". In view of the interesting properties shown by anhydrous formic acid, it was decided to investigate the …
-
Development of zeolite based acid catalysts for the synthesis of methyl tertiary butyl ether
… of MTBE, the incorporation of an organic superacid trifluoromethanesulfonic acid onto the zeolite surface have shown an important enhancement in catalytic activity and product selectivity for the large pore sized Y-type zeolite. However this method did not increase significantly the …
-
High valent element fluorosulfates and fluoride- fluorosulfates
… in order to extend the presently known conjugate superacid systems of the type HSO3F-M(SO3F)n. Metal oxidation by bis(fluorosulfuryl) peroxide (S206F2), in HSO3F, was the preferred route to these compounds. Although the polymeric M(SO3F)4 compounds were insoluble in HSO3F, they were found to be …
-
Properties and processing of direct-spun carbon nanotube mats
The mechanical and electrical properties of direct-spun carbon nanotube mats are investigated. Processing techniques which enhance their performance are developed, and their effects are characterised and understood through experiment and micromechanical modelling. Macroscopic carbon nanotube …