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2000 Fiscal Year Final Research Report Summary

Experimental study on the uptake ability of acid materials into the polycrystalline ice particles -Application to the mechanism of ozone hole development-

Research Project

Project/Area Number 10480138
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 環境保全
Research InstitutionHokkaido University

Principal Investigator

FURUKAWA Yoshinori  Hokkaido Univ., Inst.Low Temp.Sci., Assoc.Prof., 低温科学研究所, 助教授 (20113623)

Co-Investigator(Kenkyū-buntansha) ENDO Tatsuo  Hokkaido Univ., Inst.Low Temp.Sci., Assoc.Prof., 低温科学研究所, 助教授 (20001844)
YOKOYAMA Etsuro  Yamaguchi Univ., Dept.Engineering, Assoc.Prof., 工学部, 助教授 (40212302)
Project Period (FY) 1998 – 2000
Keywordspolycrystalline ice particle / ozone hole / acid materials / actual distribution coeficient / grain boundary / uni-directional growth / Mach-Zehnder interferometer
Research Abstract

Uni-directional growth experiments of ice crystals in the water including a solute of acid or salt were carried out using a newly developed growth apparatus in combination with a Mach-Zehnder interferometer. Both the pattern evolutions of ice/water interfaces and the distributions of solute concentrations in front of interfaces were observed simultaneously.
The interfacial patterns, which were completely flat at the initial stage of the growth, were changed to those composed by the array of regular finger cells. Then the boundaries between the neighboring cells can be regarded as the grain boundaries. Consequently, it means that the regular row of grain boundaries was formed along the interfaces. The distributions of solute concentrations were determined by analyzing the shifts of interference fringes at the vicinity of interfaces, and the actual concentrations of solutes on the interfaces were also determined quantitatively. The uptake abilities of solutes into the ice crystals through the interfaces were first discussed using the results of both observations.
As a result, we clarified that, when the interfacial patterns were still flat, the amount of solute rejected at the interface during the ice growth was completely consistent with the solute amount predicted by the calculation based on the equilibrium distribution coefficient of the solute against the ice crystal. However, as soon as the interfaces were changed to the perturbed ones, the mass balance of the solute completely disappeared. This means that the solutes were incorporated along the grain boundaries.
In conclusion, we determined that the actual distribution coefficients are about 0.35. This value is extremelylarger than the equilibrium distribution coefficients (0.01 or less for almost all solutes). This result strongly suggests that the grain boundaries can incorporate a large quantity of acid solutes and the polycrystalline ice particles can work as a storehouse of acid materials.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] K.Nagashima and Y.Furukawa: "Time development of a solute diffusion field and morphological instability on a planar interface in the directional growth of ice crystals."J.Crystal Growth. 209. 167-174 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Nagashima and Y.Furukawa: "Interferometric observation of gravity effect on the horizontal growth of ice crystals in a thin growth cell."Physica. D147. 177-186 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Maruyama,T.Satoi,S.Taniguchi,M.Kawamura,S.Kodera,Y.Kishimoto and Y.Furukawa: "X-ray analysis of the structure of premelted layers at ice interfaces."Jpn.J.Appl.Physics. 39. 6696-6699 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 古川義純,長島和茂: "氷結晶の成長と結晶パターン形成."応用物理. 4月号(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 古川義純: "氷の結晶成長における最近の発展."冷凍. 74. 975-981 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Nagashima and Y.Furukawa: "Time development of a solute diffusion field and morphological instability on a planar interface in the directional growth of ice crystals."J.Crystal Growth. 209. 167-174 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Nagashima and Y.Furukawa: "Interferometric observation of gravity effect on the horizontal growth of ice crystals in a thin growth cell."Physica. D 147. 177-186 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Maruyama, T.Satoi, S.Taniguchi, M.Kawamura, S.Kodera, Y.Kishimoto and Y.Furukawa: "X-ray analysis of the structure of premelted layers at ice interfaces."Jpn.J.Appl.Physics. 39. 6696-6699 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Furukawa and K.Nagashima: "Crystal growth and pattern formation of ice (in Japanese)."Ouyo Butsuri. 70 (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Furukawa: "Recent developments on researches of ice crystal growth (in Japanese)."Refrigeration. 74. 975-981 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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