Thermal Behavior, Structure, and Dynamics of Low Temperature Water Confined in Mesoporous Materials MCM-41

• YAMAGUCHI Toshio

  Department of Chemistry, Faculty of Science, Fukuoka University

• YOSHIDA Koji

  Department of Chemistry, Faculty of Science, Fukuoka University

• ITO Kanae

  Department of Chemistry, Faculty of Science, Fukuoka University

• KITTAKA Shigeharu

  Department of Chemistry, Faculty of Science, Okayama University of Science

• TAKAHARA Shuichi

  Department of Chemistry, Faculty of Science, Okayama University of Science

Bibliographic Information

Other Title

• メソポーラス物質MCM-41中に閉じ込められた低温水の熱挙動，構造とダイナミクス
• メソポーラス ブッシツ MCM 41 チュウ ニ トジコメラレタ テイオンスイ ノ ネツ キョドウ コウゾウ ト ダイナミクス

Abstract

Thermal behavior, structure and dynamics of water confined in mesoporous materials MCM-41 with various pore sizes have been investigated over a temperature range of 298 to 170 K by differential scanning calorimetry (DSC), FTIR, X-ray diffraction (XRD), quasielastic neutron scattering (QENS), and neutron spin echo (NSE) measurements. The DSC data showed that the smaller the pore size the lower the freezing and melting points. It has been found that water confined in pores of 20 Å diameter keeps the liquid state at temperatures down to 170 K. The X-ray radial distribution functions showed that the capillary-condensed water in the pores has more distorted tetrahedral structure than in bulk water with decreasing pore size. The QENS data showed that when the pore size decreases the translational diffusion of confined water is retarded to almost half compared with bulk water. The temperature dependence of the relaxation time of rotational diffusion and the residence time of translational diffusion of confined water showed the Arrhenius type behavior. The NSE data showed that the relaxation time of water confined in pores whose diameter is 20 Å follows the VTF equation above 220 K, whereas below 220 K they shows the Arrhenius type behavior, i.e. the dynamical crossover takes place in the confined water.

Journal

• BUNSEKI KAGAKU

  BUNSEKI KAGAKU 60 (2), 115-130, 2011

  The Japan Society for Analytical Chemistry

Keywords

• MCM-41
• confined water
• hydrogen bond
• X-ray diffraction
• neutron scattering

Details

• CRID: 1390001204354387712
• NII Article ID: 10027410072
• NII Book ID: AN00222633
• DOI: 10.2116/bunsekikagaku.60.115
• COI: 1:CAS:528:DC%2BC3MXjsV2lt7w%3D
• NDL BIB ID: 11009108
• ISSN: 05251931
• Web Site: http://id.ndl.go.jp/bib/11009108
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11009108
• Web Site: https://www.jstage.jst.go.jp/article/bunsekikagaku/60/2/60_2_115/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed