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Volume 54, Issue 3
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Studies on Mercury Cadmium Sulfide Pigments VIIFujiy NAKAHARA1981 Volume 54 Issue 3 Pages 123-130
Published: March 20, 1981
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe effects of ammonium salts on the color or crystal structure of mercury-cadmium sulfide pigments were investigated.
Sample-a series were coprecipitated by adding sodium sulfide solution to mixed solutions of cadmium. salts and mercury (II) salts. Sample-b series were coprecipitated by adding sodium sulfide solution and ammonium salts solutions to mixed solutions of cadmium salts and mercury (II) salts. The starting salts used in this experiment are chloride (Sample C-), nitrate (Sample N-), sulfate (Sample S-) and acetate (Sample A-) of cadmium and mercury (II) and ammonium salts are chloride, nitrate, sulfate and acetate. The coprecipitates were heat treated at 300-500°C for 2 hours. The powder properties of the coprecipitates and their heat treated products were investigated by spectral reflectance, X-ray diffraction and specific surface measurements.
Results obtained are as follows ;
(Sample C-) The addition of ammonium chloride accelerated particle growth and β→α phase transition of the pigments and was effective for red color development.
(Sample N-) The powder properties of the pigments were little affected by addition of ammonium nitrate.
(Sample S-) The particle growth, β→α phase transition and red color development of the pigments were reduced by the addition of ammonium sulfate.
(Sample A-) The addition of ammonium acetate was effective for the preparation of the pigments with uniform powder properties and the extension of the temperature range of red color development.View full abstractDownload PDF (959K) -
Mituru SUZUKI, Seisirô ITÔ, Tosihide KUWAHARA1981 Volume 54 Issue 3 Pages 131-138
Published: March 20, 1981
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSA study was made on treatment of iron oxides with alcohols, for preparation of hydrophobic iron oxide powders. As iron oxide powders, goethite, iron (III) hydroxide, hematite and magnetite were used, and as treating solutions, mainly primary alcohols in solvents such as alkane of normal chain were used. The treatment was performed by reflux method.
As a result, by treatment with alcohols, goethite changed to hematite at about 200°C by dehydration and to magnetite at 275°C by dehydration and reduction. At the same time, the surface of treated powders was modified organophilic or hydrophobic. The shell of these particles kept the original form. The change of the structure and the surface properties occurred also in case of treatment only with the solvents without alcohols. However, the change of the structure took place in lower temperatures by treating with alcohols. These phenomena were observed also in case of treating of iron (III) hydroxide etc.View full abstractDownload PDF (1209K) -
Masumi KOISHI, Yasuo UMEZAWA1981 Volume 54 Issue 3 Pages 139-148
Published: March 20, 1981
Released on J-STAGE: November 20, 2012
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Surface Treatment of Polyolefines by Photochemical ProcessesHitoshi KIMURA, Hiroyuki NAKAYAMA1981 Volume 54 Issue 3 Pages 149-157
Published: March 20, 1981
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1173K) -
Masumi KOISHI1981 Volume 54 Issue 3 Pages 158-165
Published: March 20, 1981
Released on J-STAGE: November 20, 2012
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Isao IMAI, Masami KOBAYASHI1981 Volume 54 Issue 3 Pages 166-169
Published: March 20, 1981
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (486K)
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