𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Temperature Dependence of Sol-Gel Conversion Kinetics in Gelatin-Water System

✍ Scribed by Kai Chen; Sergey Vyazovkin

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
274 KB
Volume
9
Category
Article
ISSN
1616-5187

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The conversion kinetics of an aqueous gelatin solution to gel was studied by temperature modulated and regular DSC under isothermal and continuous cooling conditions. Isothermal runs revealed a decrease in the quasi‐static heat capacity primarily associated with syneresis (phase separation) of the gel. Above 19 °C the isothermal process demonstrated negative effective activation energy that turned positive below 14 °C. Continuous cooling runs detected a reversing heat flow apparently related to the continuing formation and melting of new gel structures. Isoconversional kinetic analysis of continuous cooling measurements yielded negative activation energy for the whole range of conversions and temperatures suggesting that nucleation remained a rate controlling step throughout the whole gelation process.

magnified image

📜 SIMILAR VOLUMES

Effect of water potential on sol–gel tra
Effect of water potential on sol–gel transition and intermolecular interaction of gelatin near the transition temperature
✍ Osato Miyawaki; Yuko Norimatsu; Hitoshi Kumagai; Yoshinobu Irimoto; Hitomi Kumag 📂 Article 📅 2003 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 140 KB 👁 2 views

## Abstract The sol–gel transition of gelatin, measured by thermal analysis and viscosity measurement, was analyzed in terms of the change in hydration state of polymer molecules. A new thermodynamic model was proposed in which the effect of water potential is explicitly taken into account for the

Probing the Sol–Gel Conversion in the Te
Probing the Sol–Gel Conversion in the Tetraethoxysilane/Alcohol/Water System with the Aid of Diffusion-Controlled Fluorescence Quenching
✍ T.A. Kikteva; B.V. Zhmud; N.P. Smirnova; A.M. Eremenko; Yu. Polevaya; M. Ottolen 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 119 KB

of ortho-phenanthrolyne, which is known to form stable che-The sol-gel conversion in the tetraethoxysilane/alcohol/water late complexes with the aforesaid ions, the ESR spectra can system can be probed by means of the diffusion-controlled fluores-''sense'' the moment that the sol-gel conversion occu