In situ investigation of supercritical CO2 assisted impregnation of drugs into a polymer by high pressure FTIR micro-spectroscopy

The Analyst ◽  
2015 ◽  
Vol 140 (3) ◽  
pp. 869-879 ◽  
Author(s):  
M. Champeau ◽  
J.-M. Thomassin ◽  
C. Jérôme ◽  
T. Tassaing
Keyword(s):  
High Pressure ◽  
Supercritical Co2 ◽  
Drug Loading ◽  
Impregnation Process ◽  
In Situ Investigation ◽  
Kinetics Of

High pressure FTIR micro-spectroscopy to follow the kinetics of the drug loading during the supercritical CO2 assisted impregnation process.

The growth kinetics of CsPbBr3 microwires on mica: an in situ investigation

2020 ◽  
Vol 53 (23) ◽  
pp. 235105
Author(s):  
Chao Fan ◽  
Kaixi Bi ◽  
Zhiwen Shu ◽  
Xing Xu ◽  
Beibei Dai ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
In Situ Investigation ◽  
Kinetics Of

Feasibility Study of Raman Spectroscopy as a Tool to Investigate the Liquid-Phase Chemistry of Aliphatic Organic Peroxides

1997 ◽  
Vol 51 (1) ◽  
pp. 74-80 ◽  
Author(s):  
Peter Jacob ◽  
Bernhard Wehling ◽  
Wieland Hill ◽  
Dieter Klockow
Keyword(s):  
Hydrogen Peroxide ◽  
Raman Spectroscopy ◽  
Liquid Phase ◽  
Chemical Processes ◽  
Organic Peroxides ◽  
Time Resolved ◽  
In Situ Investigation ◽  
Phase Chemistry ◽  
Kinetics Of

The described investigations are focused on peroxides occurring as products in atmospheric chemical processes, namely, hydrogen peroxide, methylhydroperoxide, hydroxymethylhydroperoxide, bis-(hydroxymethyl)peroxide, 1-hydroxyethylhydroperoxide, bis-(hydroxyethyl)peroxide, and hydroxymethylmethylperoxide. The compounds are identified and determined through the position and intensity of their characteristic O–O stretching bands in the range between 767 and 878 cm−1. Time-resolved Raman spectroscopy of peroxide solutions permits the in situ investigation of pathways and kinetics of reactions between peroxides and aldehydes.

An Original Model Experiment Designed for High-Pressure Crystallization with a Polymer Processing Concern

2013 ◽  
Vol 554-557 ◽  
pp. 1592-1601
Author(s):  
Severine A.E. Boyer ◽  
Jean Marc Haudin
Keyword(s):  
High Pressure ◽  
Model Experiment ◽  
Polymer Processing ◽  
Original Model ◽  
Avrami Equation ◽  
Physical Analysis ◽  
Time Resolved ◽  
Diamond Anvil ◽  
Kinetics Of

A comprehensive understanding of the inherent link between in-situ growth kinetics of a polymer spherulite and high-pressure constraints under controlled temperature is concerned. As a matter of fact, while the link with temperature is well illustrated, little comprehensive study has been conducted to quantify the effect of pressure. This is yet required to model ‘extreme’ polymer processing conditions.Mainly, the experimental set-ups developed to reproduce the pressure effect can be classified into four families: “simple” cells, dilatometric set-ups, differential thermal analysis and diamond anvil plus in-situ measurement. In this context, an original model experiment, named CRISTAPRESS, has been constructed. The cell design exploits the optical properties of semi-crystalline spherulites. Time-resolved light depolarizing microscopic observations are conducted concomitantly with a fine PVT control, for high pressure up to 200 MPa and temperature up to 300 °C. The physical analysis of isothermal and isobaric holding of a model polymer shows the influence of temperature and pressure on the key kinetic parameters of crystallization, i.e., the growth rate and the number of activated nuclei, as well as on the subsequent morphologies. Simple modeling dealing with the Avrami equation and the Hoffman & Lauritzen theory is established.

Forsterite [Mg2SiO4)] Carbonation in Wet Supercritical CO2: An in Situ High-Pressure X-ray Diffraction Study

2012 ◽  
Vol 47 (1) ◽  
pp. 174-181 ◽  
Author(s):  
Herbert Todd Schaef ◽  
Bernard P. McGrail ◽  
John L. Loring ◽  
Mark E. Bowden ◽  
Bruce W. Arey ◽  
...  
Keyword(s):  
High Pressure ◽  
Diffraction Study ◽  
Supercritical Co2 ◽  
X Ray Diffraction ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document