DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Letter >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/205

Title: Electron microscopy of modified aluminum alkoxide microstructures on freeze-drying
Authors: SRIVASTAVA, A
MENON, AR
BELLARE, JR
Keywords: freeze-drying
alkoxide
chelate
microstructure
freeze
freeze-fracture
sonogel
cryo-sem
lyophilization
Issue Date: 1997
Publisher: ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS
Citation: JOURNAL OF COLLOID AND INTERFACE SCIENCE,191(2)521-524
Abstract: Direct imaging of microstructures in chelated aluminum alkoxide systems subjected to freeze-drying and freeze-thaw-drying is reported using cryo-scanning electron microscopy (SEM) and SEM techniques, Aluminum sec-butoxide was chelated with a beta-diketoester in different molar ratios. This system was gelled by hydrolysis under intense sonication. The sonogels formed were subjected to cryo-SEM. Samples for cryo-SEM were made by freezing the chelated alkoxide samples in liquid nitrogen and freeze-fracturing them inside the cryo-SEM and monitoring the apparent morphological changes on exposure to the cryo-SEM environment including intentional sample heating, Microstructures of unchelated, 1:1 chelated and 1:2 chelated (alkoxide:chelate) sonogels after freezing, thawing, and drying were also imaged by SEM techniques, Heterogeneity introduced by chelation of alkoxide is proposed as the cause for the formation of flakes in freeze-thaw-dried chelated alkoxide gels, Microstructures of 1:1 chelated freeze dried alkoxide were compared with the freeze-thaw-dried gels, The absence of flakes in the chelated samples when subjected to in situ freeze-drying indicated reversible nature of the gels. (C) 1997 Academic Press.
URI: http://dx.doi.org/10.1006/jcis.1997.4946
http://dspace.library.iitb.ac.in/xmlui/handle/10054/13994
http://hdl.handle.net/100/205
ISSN: 0021-9797
Appears in Collections:Letter

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback