Structural and Chemical Approach toward Understanding the Aqueous Corrosion of Sodium Aluminoborate Glasses
authors Kapoor, S; Youngman, RE; Zakharchuk, K; Yaremchenko, A; Smith, NJ; Goel, A
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY B
keywords DOUBLE-RESONANCE NMR; HIGH-RESOLUTION B-11; NUCLEAR-MAGNETIC-RESONANCE; AL-27 MAS NMR; BORATE GLASSES; SITE CONNECTIVITIES; ALUMINOSILICATE GLASSES; DISSOLUTION BEHAVIOR; BIOACTIVE GLASS; OXIDE GLASSES
abstract Despite an ongoing strenuous effort to understand the compositional and structural drivers controlling the chemical durability of oxide glasses, there is still no complete consensus on the basic mechanism of glass dissolution that applies to a wide composition space. One major reason for this problem is the structural complexity contained within the multicomponent silicate glasses chosen for glass corrosion studies. The nonsilicate network polyhedra present in these glasses interact with one another, often in unpredictable ways, by forming a variety of structural associations, for example, Al-[IV]-B-[III] and B-[III]-B-[IV], resulting in significant influence on both the structure of the glass network and related macroscopic properties. Likewise, the formation of a variety of next-neighbor linkages, as well as increasingly complex interactions involving Si and differently coordinated next-nearest neighbor cations, is very difficult to decipher experimentally. Consideration of these factors motivates instead a different strategy: that is, the study of a sequence of SiO2-free ternary or quaternary glass compositions, whose structures can be unambiguously determined and robustly linked to their corrosion properties. With this aim, the present study is focused on understanding the structural drivers governing the kinetics and mechanism of corrosion of ternary Na2O-Al2O3-B2O3 glasses (in water) over a broad composition space comprising compositions with distinct structural features. It has been shown that the addition of Al2O3 to binary sodium borate glasses decreases their corrosion rate in water and converts their dissolution behavior from congruent to incongruent leading to the formation of six-coordinated alumina, and higher concentration of four-coordinated boron (in comparison to pre-dissolution glasses) in post-dissolution glass samples. The drivers controlling the corrosion kinetics and mechanism in these glasses based on their underlying structure have been elucidated. Some open questions have been proposed which require an extensive analysis of surface chemistry of pre- and post-dissolution samples and will be investigated in our future work.
publisher AMER CHEMICAL SOC
issn 1520-6106
year published 2018
volume 122
issue 48
beginning page 10913
ending page 10927
digital object identifier (doi) 10.1021/acs.jpcb.8b06155
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000452693400014
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journal analysis (jcr 2017):
journal impact factor 3.146
5 year journal impact factor 3.101
category normalized journal impact factor percentile 60.204
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