Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (01): 109-112.doi: 10.3866/PKU.WHXB19920119

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Mercury Porosimetry for the Determination of Water and n-Decan in Porous Glass

Zhou Ya-Ping; Lentz, H.   

  1. Department of Chemistry, Tianjin University, Tianjin 300072; Department of Chemistry, Siegen University, FRG
  • Received:1990-07-25 Revised:1990-11-30 Published:1992-02-15
  • Contact: Zhou Ya-Ping

Abstract: Structuring of water on glass surface has been widely reported. There exists a debate on the thickness of the structured water layer on these surfaces, sometimes long-range, sometimes short-range structuring of the surface water was inferred. We used a porosimeter to measure the pore volume of controlled pore glass with pore radius 12.1 nm, which had pre-adsorbed various amount of water, and to study the behaviour of water on controlled pore glass surfaces. It has been found that the first 2-3 layers of the adsorbed water were modified from the bulk water. The thickness of this modified water layer on the controlled pore glass was calculated to be about 0.5 nm and the density of this water was much higher than that of the bulk water. The rest of the adsorbed water was similar to bulk water.
No abnormal phenomena was found for n-Decan in the controlled pore glass. For any amount of adsorbed n-Decan, they had similar property as that of the bulk n-Decan.

Key words: Cotrolled pore glass, Mercury Porosimeter, Thickness of the modified water, n-Decan