NDLI: Rheological Properties of Candelilla Wax and Dotriacontane Organogels Measured with a True-Gap System

Content Provider	Springer Nature Link
Author	Morales Rueda, Juan A. Dibildox Alvarado, Elena Charó Alonso, Miriam A. Toro Vazquez, Jorge F.
Copyright Year	2009
Abstract	The rheology of organogels developed by candelilla wax (CW) and a pure n-alkane (dotriacontane, C32) was evaluated with a rheometer equipped with a true-gap system and compared with the rheograms obtained with a fixed-gap system. The two systems used a cone and plate geometry. In contrast to the fixed-gap system, the true-gap system makes the corrections in the gap size associated with the expansion/shrinkage of the sample and/or the rheometer geometry when changing temperature conditions are used during measurements. The CW and C32 organogels were prepared using safflower oil high in triolein (SFO) as the liquid phase, and the treatments studied resulted from the factorial combinations of two levels of gelator concentration (1 and 3%) and two gel setting temperatures (T $_{set}$; 5 and 25 °C) achieved using a cooling rate of 1 or 10 °C/min. The use of the true-gap system provided rheological parameters (i.e., G′ profiles) that agreed with the micro structure and the calorimetric (i.e., heat of melting, ΔH $_{M}$) behavior of both the CW and the C32 organogels. The use of a fixed-gap system in the rheological characterization of organogels must be treated with caution, specially with time dependent G′ determinations involving the use of fast temperature ramps (i.e., 10 °C/min).
Starting Page	765
Ending Page	772
Page Count	8
File Format	PDF
ISSN	0003021X
Journal	Journal of the American Oil Chemists' Society
Volume Number	86
Issue Number	8
e-ISSN	15589331
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-06-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rheology < Lipid chemistry/Lipid analysis Lipid chemistry/Lipid analysis Biotechnology Food Science Agriculture Biomaterials Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Chemical Engineering

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