Percolation model for selective dissolution of multi-component glasses

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A percolation model is developed which accounts for most known features of the process of porous glass membrane preparation by selective dissolution of multi-component glasses. The model is founded within tile framework of the classical percolation theory, wherein the components of a glass are represented by random sites on a suitable lattice. Computer simulation is used to mirror the generation of a porous structure during the dissolution process, reproducing many of the features associated with the phenomenon. Simulation results evaluate the effect of the initial composition of the glass on the kinetics of the leaching process as well as the ... continued below

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7 p.

Creation Information

Kale, R.P. & Brinker, C.J. March 1, 1995.

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  • Kale, R.P. New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemical and Nuclear Engineering
  • Brinker, C.J. Sandia National Labs., Albuquerque, NM (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

A percolation model is developed which accounts for most known features of the process of porous glass membrane preparation by selective dissolution of multi-component glasses. The model is founded within tile framework of the classical percolation theory, wherein the components of a glass are represented by random sites on a suitable lattice. Computer simulation is used to mirror the generation of a porous structure during the dissolution process, reproducing many of the features associated with the phenomenon. Simulation results evaluate the effect of the initial composition of the glass on the kinetics of the leaching process as well as the morphology of the generated porous structure. The percolation model establishes the porous structure as a percolating cluster of unreachable constituents in the glass. The simulation algorithm incorporates removal of both, the accessible leachable components in the glass as well as the independent clusters of unreachable components not attached to the percolating cluster. The dissolution process thus becomes limited by the conventional site percolation thresholds of the unreachable components (which restricts the formation of the porous network), as well as the leachable components (which restricts the accessibility of the solvating medium into the glass). The simulation results delineate the range of compositional variations for successful porous glass preparation and predict the variation of porosity, surface area, dissolution rates and effluent composition with initial composition and time. Results compared well with experimental studies and improved upon similar models attempted in die past.

Physical Description

7 p.

Notes

OSTI as DE95008174

Source

  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95008174
  • Report No.: SAND--95-0392C
  • Report No.: CONF-941144--96
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 36582
  • Archival Resource Key: ark:/67531/metadc679668

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • June 27, 2016, 1:03 p.m.

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Kale, R.P. & Brinker, C.J. Percolation model for selective dissolution of multi-component glasses, article, March 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc679668/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.