Morphological Diversity in the Crystal Growth of Potassium Dichromate in Gelatin Gel.

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  • Suda Jun–ichiro
    Department of General Education, Sasebo National College of Technology, Sasebo 857–11
  • Nakayama Tomoo
    Department of Physics, Faculty of Science and Engineering, Chuo University, Kasuga, Bunkyo–ku, Tokyo 112
  • Nakahara Akio
    Department of Physics, Faculty of Science and Engineering, Chuo University, Kasuga, Bunkyo–ku, Tokyo 112
  • Matsushita Mitsugu
    Department of Physics, Faculty of Science and Engineering, Chuo University, Kasuga, Bunkyo–ku, Tokyo 112

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タイトル別名
  • Morphological Diversity in the Crystal

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Potassium dichromate (K2Cr2O7) grown in gelatin has been found to exhibit five morphological phases, i.e., right- or left-handed spiral, spherulite, square polelike, platelike and DLA-like crystals when varying the initial concentrations of K2Cr2O7 and gelatin. The results are summarized in a morphological phase diagram. Although we reported in our previous letter that spiral crystals obtained were all right-handed, only a few left-handed spiral crystals have also been observed in a specific subregion of the spiral growth region in the phase diagram. Square polelike crystals have shown tendency to grow and fuse together side by side in a region adjacent to the spiral growth in the phase diagram. This strongly suggests that spirals are composed of small square polelike crystals fused together. It is conjectured that right-handed triple helices of collagen molecules constituting gelatin-gel perturb the growth process to form right-handed spirals obtained mainly in the present experiments.

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