Changes in Surface Appearance of Silver Chloride De-ammoniated after Complexation with Liquid, Gaseous and Aqueous Ammonia
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概要
- 論文の詳細を見る
Particles of AgCl were soaked in liquid NH_3 or exposed to gaseous NH_3. The ammine complexes thus formed were unstable when exposed to the atmosphere but showed characteristic X-ray patterns and differential scanning calorimetry (DSC) curves. The complex formed by soaking was found to be the triammine complex from the weight decrease after de-ammoniation and the AgCl particles recovered were seen to be porous rods on scanning electron micrographs. On the other hand, the sesquiammine complex was formed by prolonged exposure to gaseous NH_3. The AgCl particles obtained via this complex retained the external form of the original particles and were also porous when observed under an electron microscope. The specific surface areas of the particles obtained via the triammine and the sesquiammine complexes were greatly increased and reached 2.9±0.1 and 1.4±0.1 m^2/g, respectively. These particles were disintegrated to some extent by applying mechanical force but the specific surface areas were decreased due to contraction of the pores resulting from the intrinsic plasticity of AgCl. In addition, AgCl was dissolved in aqueous NH_3 and the NH_3 was subsequently removed by evaporation and by freeze-drying. In the case of evaporation, AgCl was recovered as large polyhedral crystals. Since porous particles of AgCl were absent, it is clear that the crystals were directly formed from the aqueous solution without separation of solid ammine complexes. On the other hand, when the aqueous solution was freeze-dried, the recovered particles of AgCl showed porous structure and the specific surface area was found to be 3.5m^2/g. Therefore, it was considered that an ammine complex-presumably the diammine complex-crystallized out during freezing of the aqueous solution. Finally, the apparent specific volumes were measured and it was found that the intraparticle void, and in some cases the external shape of the secondary porous particles, exerted a considerable influence on the packing.
- 社団法人日本薬学会の論文
- 1984-04-25
著者
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鈴木 悦子
School Of Pharmaceutical Sciences Kitasato University
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津田 泰之
北里大薬
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津田 泰之
School Of Pharmaceutical Sciences Kitasato University
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関口 慶二
School of Pharmaceutical Sciences, Kitasato University
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城谷 憲一
School of Pharmaceutical Sciences, Kitasato University
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岡本 喜久子
School of Pharmaceutical Sciences, Kitasato University
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繁田 徳子
School of Pharmaceutical Sciences, Kitasato University
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城谷 憲一
School Of Pharmaceutical Sciences Kitasato University
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関口 慶二
School Of Pharmaceutical Sciences Kitasato University
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繁田 徳子
School Of Pharmaceutical Sciences Kitasato University
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岡本 喜久子
School Of Pharmaceutical Sciences Kitasato University
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