Shrinkage and microstructural development during drying of organically modified silica xerogels

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Description

We have studied the different driving forces behind syneresis in MTES/TEOS gels by aging them in different H{sub 2}O/EtOH pore fluids. We show using shrinkage, density, contact angle, and N{sub 2} sorption measurements, the influence of gel/solvent interactions on the microstructural evolution during drying. Competing effects of syneresis (that occurs during aging) and drying shrinkage resulted in the overall linear shrinkage of the organically modified gels to be constant at {approximately}50%. Increasing the hydrophobicity of the gels caused the driving force for syneresis to change from primarily condensation reactions to a combination of condensation and solid/liquid interfacial energy. In addition ... continued below

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6 p.

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Raman, N.K.; Wallace, S. & Brinker, C.J. July 1, 1996.

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  • Raman, N.K. New Mexico Univ., Albuquerque, NM (United States)
  • Wallace, S. Nanopore Corp., Albuquerque, NM (United States)
  • 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

We have studied the different driving forces behind syneresis in MTES/TEOS gels by aging them in different H{sub 2}O/EtOH pore fluids. We show using shrinkage, density, contact angle, and N{sub 2} sorption measurements, the influence of gel/solvent interactions on the microstructural evolution during drying. Competing effects of syneresis (that occurs during aging) and drying shrinkage resulted in the overall linear shrinkage of the organically modified gels to be constant at {approximately}50%. Increasing the hydrophobicity of the gels caused the driving force for syneresis to change from primarily condensation reactions to a combination of condensation and solid/liquid interfacial energy. In addition the condensation driven shrinkage was observed to be irreversible, whereas the interfacial free energy driven shrinkage was observed to be partially reversible. Nitrogen sorption experiments show that xerogels with the same overall extent of shrinkage can have vastly different microstructures due to the effects of microphase separation.

Physical Description

6 p.

Notes

OSTI as DE96011698

Source

  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996

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  • Other: DE96011698
  • Report No.: SAND--96-1482C
  • Report No.: CONF-960401--56
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 254233
  • Archival Resource Key: ark:/67531/metadc673030

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Creation Date

  • July 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Aug. 25, 2016, 2:45 p.m.

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Raman, N.K.; Wallace, S. & Brinker, C.J. Shrinkage and microstructural development during drying of organically modified silica xerogels, article, July 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc673030/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.