Processes during liquation of Vycor glass studied by positron annihilation lifetime spectroscopy

Literature Information

Publication Date 2000-06-22
DOI 10.1039/B002499F
Impact Factor 3.676
Authors

Bożena Jasińska, Andrzej L. Dawidowicz, Tomasz Goworek, Stanisław Radkiewicz


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Abstract

This study concerns Vycor glass subjected to liquation in the temperature range 725–950 K and leached in hot acid in order to produce pores. Three stages of pore creation were observed with increasing liquation temperature: The initial structure of nanopores with a radius of about 0.5 nm (like in the nonliquated glass) disappears, giving way to the next group, dominant at 875 K, whose average radius is 1.15 nm, independently of the liquation time. The spread of these radii is narrow, 0.15 nm. At the highest temperatures, the intensity of this component decreases rapidly (down to 1%), and large pores begin to grow; the specific surface area diminishes. About 900 K, the total positronium formation probability decreases significantly, which can be ascribed to the partial crystallization of silica.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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