著者

久保田 徳昭

出版者

無機マテリアル学会

雑誌

無機マテリアル (ISSN:2185436X)

巻号頁・発行日

vol.2, no.258, pp.320-328, 1995-09-01 (Released:2011-03-07)

参考文献数

24

著者

永井 彰一郎 關谷 道雄

出版者

無機マテリアル学会

雑誌

石膏 (ISSN:21854343)

巻号頁・発行日

vol.1950, no.1, pp.37-41, 1950-09-30 (Released:2010-08-05)

参考文献数

45

著者

近藤 連一 大門 正機 大沢 栄也

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1971, no.112, pp.92-96, 1971-05-01 (Released:2011-03-07)

参考文献数

12

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The equations showing the relationship between the rate of water absorption and the pore size of porous materials were studied in connection with the water absorption phenomena in consideration of the various capillary models and also new equations were tentatively derived.The water absorption experiments were done by using hydrated α and β-CaSO4·1/2 H2O for examples and the previonsly mentioned equations were applied to the results and some discussions were made. The electrical resistance which changes with absorption of the ionic solution into the specimen was measured for the calculation of the through pore size distribution.The results showed that in the case of β-CaSO4·1/2 H2O, the varying radius capillary model in which each capillary has various radius was in good accordance with the structure estimated by the mercury penetration method and the scanning electron microscope observation. While, the pore size distribution of α-CaSO4·1/2 H2O showed good accordance with the meandering capillary model rather than that with the varying radius model. The straight capillary model might be in general inadequate. These facts seem to indicate that the tortuosity is related with either the variation of radius in each capillary or the meandering of each capillary, varying with the sort of specimen.It was found that the method to measure the rate of water absorption is valuable to study the pore structure of the materials.

著者

小田部 廣男

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1987, no.210, pp.307-316, 1987-09-01 (Released:2011-03-07)

参考文献数

9

著者

三浦 啓一 望月 大祐 仙波 裕隆 丸田 俊久 橋本 和明 戸田 善朝

出版者

無機マテリアル学会

雑誌

無機マテリアル (ISSN:2185436X)

巻号頁・発行日

vol.6, no.280, pp.213-219, 1999-05-01 (Released:2011-03-07)

参考文献数

9

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The fundamental experiment for the purpose of recovery of vanadium from oil burning ash, which was the valuable resources in Japan, was carried out. The following summarized the results.Sulfuric acid was superior to aqueous ammonia as extraction media in the process of leaching vanadium ion from oil burning ash.Precipitation ratio of vanadium compounds at room temperature was low. For example, the yield of vanadium compounds for 259200 s was no more than 60%. On the contrary, the precipitation rate increased at the higher reaction temperature and the yield reached up to approximately 100% at 80°C.Initial concentration of vanadium ion was the important factor besides pH and reaction temperature. The higher initial concentration of vanadium ion enlarged the appropriate pH range for the precipitation. In the case of 16000 ppm of the initial concentration, the pH range was 2.0 to 2.8. It was wider than that of 4000 ppm or 8000 ppm.The above results suggested that the higher initial concentration of vanadium ion, proper pH and higher reaction temperature were necessary to recover vanadium from oil burning ash efficiently.

著者

植松 敬三

出版者

無機マテリアル学会

雑誌

無機マテリアル (ISSN:2185436X)

巻号頁・発行日

vol.3, no.263, pp.332-339, 1996-07-01 (Released:2011-03-07)

参考文献数

12

著者

伊永 孝

出版者

無機マテリアル学会

雑誌

Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)

巻号頁・発行日

vol.9, no.300, pp.346-352, 2002-09-01 (Released:2011-03-07)

参考文献数

6

著者

寺岡 一郎 伊藤 集〓

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1956, no.22, pp.1175-1178, 1956-05-01 (Released:2011-03-07)

参考文献数

1

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When plaster of Paris is mixed with water in order to make a plaster mold, there takes place a phenomenon so called “segregation of water” in the mold. This phenomenon is one of the causes of the change of dimension of plaster mold. So called “Segregation” is caused by the excess water during setting of plaster. It can be explained exactly by means of measuring the water content, the micro-photo graph, and the thermal expansion of different parts of a mold. We have studied how to prevent the phenomenon and obtained some effective results.

著者

今井 茂雄 久野 裕明 山田 剛 前田 拓也 高麗 寛紀

出版者

無機マテリアル学会

雑誌

無機マテリアル (ISSN:2185436X)

巻号頁・発行日

vol.6, no.283, pp.451-456, 1999-11-01 (Released:2011-03-07)

参考文献数

14

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The silver-doped ceramics is the whitewares coated with low-temperature lime zinc glaze containing silver, and has bactericidal activity. In this study, the mechanism of the bactericidal action of the silver-doped ceramics against bacteria, mainly Escherichia coli K12 W3110, was investigated. The silver-doped ceramics had high bactericidal activity when it was irradiated by visible light. Since the eluted silver ions from the surface of ceramics were not detected by ICP measurement and the supernatant had no bactericidal activity, it was proved that the eluted silver ions do not contribute to the bactericidal action of the ceramics. The bactericidal activity was extremely inhibited in the presence of radical scavengers such as L-cysteine, L-alanine or I-. After the silver-doped ceramics was removed from the cell suspension irradiated for 60 min, the bactericidal activity was still maintained, and was inhibited by L-cysteine. The silver-doped ceramics also had bactericidal activity against Bacillus subtilis ATCC6633.These results suggest that the bactericidal action of silver-doped ceramics is caused by the hydroxyl radical which is generated on the surface of the ceramics by light irradiation and is converted to a living radical in bacterial cells.

著者

岡 淳平

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1968, no.92, pp.15-23, 1968-01-01 (Released:2011-03-07)

参考文献数

4

著者

大河内 正一

出版者

無機マテリアル学会

雑誌

Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)

巻号頁・発行日

vol.12, no.319, pp.416-422, 2005-11-01 (Released:2011-03-07)

参考文献数

18

著者

大門 啓志 呉 敏 杉田 智和 引地 康夫 松原 孝至 太田 敏孝 可児 良弘

出版者

無機マテリアル学会

雑誌

Journal of the Society of Inorganic Materials, Japan

巻号頁・発行日

vol.8, no.293, pp.283-288, 2001

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A commercial hydroxyapatite, which has been regarded as a powder with low sinterability, was ground by four kinds of wet ball-milling in order to improve the sinterability. The effect of the grinding on the sinterability was investigated by comparing the four methods. When the powder was ground under water as a dispersion media, fine particles generated by the grinding cohere to reconstruct aggregates, then milling effects disappear. The fine particles without reconstructed aggregates can be obtained by ball-milling under ethyl alcohol as a dispersion media. The grinding efficiency can be improved by using balls with a high true density. The sizes of aggregates were diminished to 0.1-0.2μm by ball-milling using nylon coated iron balls. The powder ground by the nylon coated iron ball was formed into disks and then heated at 1200°C for 1 h. The bulk density of the sintered body was >98% of the theoretical density.

著者

高麗 寛紀

出版者

無機マテリアル学会

雑誌

無機マテリアル (ISSN:2185436X)

巻号頁・発行日

vol.6, no.283, pp.428-436, 1999-11-01 (Released:2011-03-07)

参考文献数

14

著者

村田 義彦

出版者

無機マテリアル学会

雑誌

Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)

巻号頁・発行日

vol.7, no.287, pp.323-330, 2000-07-01 (Released:2011-03-07)

参考文献数

17

著者

安江 任

出版者

無機マテリアル学会

雑誌

Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)

巻号頁・発行日

vol.9, no.299, pp.192-207, 2002-07-01 (Released:2011-03-07)

参考文献数

67

著者

湊 秀雄

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1991, no.235, pp.531-546, 1991-11-01 (Released:2011-03-07)

参考文献数

15

著者

荒井 康夫 永井 彰一郎

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1963, no.67, pp.245-252, 1963-11-01 (Released:2011-03-07)

参考文献数

3

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Observation were made on the mechanism of formation of forsterite in MgO-SiO2 system reactions and the transformation of the crystal lattice of forsterite accompanying the displacement of Mg2+ in the lattice by Fe2+ of varing amount in order to scrutinize the course of formation of olivine, which is known as a component mineral of serpentine rock and various slags. It was confirmed by this study that Fe2+ dissolves at first when olivine is dissolved with an acid. This rapid dissolution of Fe2+ was attributed to the larger affinity of Fe2+ to an acid solution than Mg2+. 10 kinds of silicate minerals related with MgO-SiO2 system were then synthesized to study on the relation between the structure of silicate and its acid solubilities. It was concluded that the acid solubilities of CaO-SiO2 system is rather high because the polarization effect of Ca2+ is smaller than that of Mg2+ and that this acid solubility is more with CaO-MgO-SiO2 system, which has dissolved Mg2+, because the clearance in the structure is larger, and that the acid solubilities of silicates are dependent on the polymerization degree of silicate ions which constitute the silicate and, consequently, orthosilicates with island structure is most soluble.

著者

三原 直人 奥村 諭 小島 義弘 松田 仁樹

出版者

無機マテリアル学会

雑誌

Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)

巻号頁・発行日

vol.13, no.320, pp.51-58, 2006-01-01 (Released:2011-03-07)

参考文献数

7

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Effect of Fe2O3 on reductive decomposition of gypsum was investigated. The experiments were carried out by employing CaSO4 powder of the mean particle size of 80, um which was mixed with 150 mass% Fe2O3, under CO : 2%-CO2 : 30%-N2 : balance and CO : 10%-N2 : balance atmosphere at 1273 K, in a gas-flow type tubular reactor. Furthermore, SO2 absorption characteristic of CaO thus regenerated from CaSO4-Fe2O3 mixture by CO reductive gas was studied.It was found that the rate of reductive decomposition of CaSO4 was drastically enhanced by addition of Fe2O3. Moreover, the formation of CaS was inhibited by the addition of Fe2O3. Calcium ferrite such as 2CaO.Fe2O3 was detected in the reaction product after reductive decomposition of the mixture of CaSO4-Fe2O3. As the result of SO2 absorption experiment, it was found that CaO regenerated. from CaSO4-Fe2O3 by CO reductive gas had a lower SO2 absorption performance than CaO regenerated from CaSO4. due to a decrease in Dore volume.

著者

石原 信一

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1978, no.153, pp.75-80, 1978-03-01 (Released:2011-03-07)

参考文献数

24

著者

岩下 哲志

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1991, no.234, pp.373-378, 1991-09-01 (Released:2011-03-07)

参考文献数

32