Studies on the rigidity of gelatine gels

✍ Scribed by Tar, Ildikó ;Wolfram, Ervin

• Publisher: Wiley (John Wiley & Sons)
• Year: 1979
• Tongue: English
• Weight: 257 KB
• Volume: 11
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980110211

✦ Synopsis

Abstract

Gelatine gel samples formed in contact with phases of various polarity such as glass, plexiglass (PMMA) and air have been studied by a Röth‐type micro‐penetrometer. The experimental results showed that the penetrability of the gels was significantly effected by the adjacent phase. Comparing the data with those found on a freshly cut surface representing the bulk of the gel it can be assumed that the differences are caused by different orientation of the gelatine molecules in the penetrated region. In order to prove this assumption gels containing sodium chloride, sodium sulphate and sodium dodecyl sulphate, respectively were prepared. It has been shown that the rigidity of the gel/air surface and that of the bulk was effected similarly but not equally by the salts.

In order to learn the processes occurring in presence of the above mentioned cosolutes turbidity measurements were carried out on all samples using a Pulfrich nephelometer.