Title
Laminated altered layers in historical glass : density variations of silica nanoparticle random packings as explanation for the observed lamellae Laminated altered layers in historical glass : density variations of silica nanoparticle random packings as explanation for the observed lamellae
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Design Sciences
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Journal of non-crystalline solids. - Amsterdam
Volume/pages
442(2016) , p. 1-16
ISSN
0022-3093
ISI
000375809800001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
One of the most striking but unexplained phenomena in the natural degradation of glass is the transformation of an almost colorless, transparent and homogeneous glass into a colored, opaque and heterogeneous degradation layer. In many cases, the degradation layer consists of numerous lamellae with a thickness between 0.1 and 10 pm. However, both internal structure and formation proess of laminated degradation layers remain unclear. In this paper, a model is proposed where we assume that transformed (degraded) glass consists of a random packing of nano-sized silica particles while the lamellae are the result of different packing densities. The model is able to connect the texture of numerous lamellae observed by several types of microscopic techniques with the structure at molecular level determined by means of chemical analysis. In addition, the model is able to explain numerous properties such as the parameters responsible for the contrast between lamellae. This contrast can be caused by differences in color, density, elemental composition, or surface roughness. (C) 2016 Elsevier B.V. All rights reserved.
E-info
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https://repository.uantwerpen.be/docman/iruaauth/9cc30a/133634.pdf
Handle