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The general scheme of conversion of hydrocarbon fuels with new
experimental data on the formation of fullerenes and graphenes taking into
account the pressure effect is proposed for the fuel-rich flames. It is shown that the formation of fullerenes is important to the
corresponding spatial orientation of PAH, possible at low pressures. The
formation of hydrophobic soot surface on silicon and nickel substrates during
combustion of propane-oxygen flame was studied. It is established that the
hydrophobic properties are due to the presence of soot particles in the form
nanobeads. The photovoltaic properties of solar cells coated by nickel oxide
nanoparticles synthesized in counter flow propane-air flame. It is revealed
that coated the surface of a silicon solar cell by nickel oxide nanoparticles
results in the increase in solar cell efficiency by 3%.
Recently developed low fluorine containing polymers are advanced materials which confer advantageous properties to surfaces at a lower cost than conventional fluoropolymers (like PTFE), and are also more easily processable. Fluoropolymer surfaces are characterized by a low surface energy, high oleo and hydrophobicity, low coefficients of friction, among many other properties. This makes them desired materials in microelectronics, antifogging, antifouling and medical applications, to name a few. Fluorinated compounds are not easily coupled with macromolecules or common organic systems, and great efforts are made to compatibilize fluorinated species with hydrocarbon polymers. In this work, two chemical routes were explored in order to incorporate perfluorinated alkyl chains in an epoxy-amine based thermoset. On one side, a perfluoroalkyl thiolated molecule was used as a stabilizing ligand for silver nanoparticles, which were incorporated in the matrix polymer. On the other hand, fluorinated chains containing epoxy functionalities, were used as the matrix modifier. In the first case, fluorinated chains covering the nanoparticles, were mixed with the matrix, while in the second case, the fluoroalkyl chains were chemically linked to the network. Fluorine migration to the air—polymer interface was confirmed by X-Ray photoelectron spectroscopy (XPS). The materials hydrophobicity was then studied in terms of their contact angle with water (CA), as a function of the surface composition and the topography. Scanning electron microscopy (SEM) and atomic force microscopy (AFM), operated in moderate and light tapping modes, were used to morphologically describe the surfaces. An exhaustive surface analysis was made in order to explain the different hydrophobicity grades found.
A new approach to the problem of cold denaturation
is presented. It is based on solvent-induced effects operating on hydrophilic
groups along the protein. These effects are stronger than the corresponding
hydrophobic effects, and they operate on the hydrophilic groups which are
plentiful than hydrophobic groups. It is shown that both heat and cold denaturation can be explained by these hydrophilic effects.