PDF Publication Title:
Text from PDF Page: 189
5.4 Discussion The control experiments are used to validate that the PRESS process, through the use of high pressure carbon dioxide, is affecting the characteristics of the deposited metal oxide films. Dense films are observed at 100 volume % for either Ttip or ZnEO. This is also true at relatively low concentrations for both precursors. The highly dendritic structures occur in the middle of the concentrations range. This is likely due to the vapor-liquid (VL) equilibria of the two systems. Typically, when dealing with carbon dioxide and another component whose molecular size varies greatly, a “cigar” shaped VL envelope defines the phase of system in a P-x diagram.35 At both extremes of composition of the heavy component, a single phase persists throughout the range of pressure. However, between these extremes, there exists a region of two phases. When the system is initially injected with CO2 at high pressure, the system is forced into a single phase. As the solution expands across the nozzle, the two components are forced through this two phase region, resulting in increased atomization of the precursor. It is because of this quick phase change that highly dendritic films are deposited in the range of 25 to 75 volume %. The acetic acid concentration study is performed at the 25 % Ttip concentration because the change in carbon dioxide concentration, from the addition of at most 15 volume % of acetic acid, is negligible between the range of 25 % and 75 % precursor concentration since the characteristics of the deposited film are not changed in this range. It is reported that the addition of acetic acid during the formation of titania nanoparticles via a modified sol-gel process with titanium isopropoxide is used to control the hydrolysis and condensation reactions in order to achieve the titania polymorph, 165PDF Image | Supercritical Fluid Deposition Of Thin Metal Films
PDF Search Title:
Supercritical Fluid Deposition Of Thin Metal FilmsOriginal File Name Searched:
Supercritical-Fluid-Deposition-Of-Thin-Metal-Films-Kinetics-Mec.pdfDIY PDF Search: Google It | Yahoo | Bing
Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)