巻号一覧
31 巻 (1991 - 1992)
- 4 号 p. 190-
- 3 号 p. 127-
- 2 号 p. 61-
- 1 号 p. 1-
31 巻, 2 号
選択された号の論文の9件中1～9を表示しています
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井上 厚行1991 年 31 巻 2 号 p. 61-68
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーThe purpose of this paper is to distill current and future directions of research on interstratified illite/smectite minerals by overviewing the research history. Considerable amount of information on the illite/smectite has been accumulated by previous researchers. At present, clay mineralogists are devoted to constructing the most reasonable model for the mechanism and kinetics of smectite-to-illite conversion on the basis of the previous information. More recent reseach appears to lead us to the final goal for understanding the reality of interstratified mineral in the near future. However, a discovery always offers us new and more difficult problems, as described in the long research history of the mineral. From this viewpoint, the study of illite/smectite may be a paradigm for clay science.抄録全体を表示PDF形式でダウンロード (954K) -
1991 年 31 巻 2 号 p. 68
発行日: 1991年
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (107K) -
岩崎 孝志1991 年 31 巻 2 号 p. 69-74
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーMethod for the producing of mesoporous materials was developed among the intermediate process in the synthesis of smectites. The product made from a Si-Mg hydrous oxide by hydrothermal treatment at relatively low temperature has the properties of porous materials with micro and mesopores. This material can be transformed into a mesoporous material having sharp pore size distribution about 40Å by the intercalation of large organic ions and by heating to remove the organic substances. The mesoporous material is, therefore, expected to be applied in various industrial fields such as separation of organic molecules like methyl derivatives of tocol.抄録全体を表示PDF形式でダウンロード (3731K) -
逸見 彰男1991 年 31 巻 2 号 p. 75-81
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーIt was difficult for allophane to determine its chemical structure by simple application of conventional structure analysis like X-ray diffraction method, because of the poorly ordered nature in its structure. However, dexterous and extensive utilization of various chemical procedures and recent sophisticated instrumental analysis such as solid-state high resolution NMR spectroscopy has made almost clear the chemical structure of allophane. The clarified structure has enabled allophane to elucidate its physicochemical properties, ion exchange and adsorption, charge characteristics, dispersion and flocculation, interaction with water molecule and so forth, in the stage of as deep as molecular level. It is expected that more detailed mechanism of the properties in microscopic and electron levels will be analyzed by active introduction of new computer methods, molecular orbital calculation, with which distribution and energy for the orbital of allophane structure and charge allocation as well can be evaluated. In the near future, academic fields of “quantum clay mineralogy” and “quantum soil science” may necessarily be born and developed, just as molecular biology and quantum biology have been occurred.抄録全体を表示PDF形式でダウンロード (874K) -
田崎 和江1991 年 31 巻 2 号 p. 82-90
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーOur atmosphere, oceans, sediments and soils, all reflect major or minor influences of the biosphere. In the sediments, erosion of the topsoil, complex mixture of clay minerals and carbon compounds, is one of crisis in the world economy. Clay mineralogist concerned with the sediments and mineral deposits must understand weathering processes plus microorganisms in detail. Bacteria must be important in all transport processes of elements between sediments and water systems. In the atmosphere, fine particles, such as clays, loess and fly ash produced by combusion of fossil fuels are biologically and chemically recycling in our planet. The consequences of a massive increase in the use of coal or other fossil carbon sources give the global atomospheric increase of CO2N2O, acid gases, etc.
Modern electron microscopic techniques and the new array of computer surface techniques, ESCA, Auger, SIMS, etc. have made it possible to see Å level structures, and chemistry of the fine particles. Examples of such fine mineralogical particles in the surface environment are described in this paper.抄録全体を表示PDF形式でダウンロード (14709K) -
立山 博1991 年 31 巻 2 号 p. 91-96
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーColloidal properties of clay minerals may have some effects on the rheology and plasticity in the claywater system.It is well known that clay minerals have very complicated properties from the crystallochemical standpoints. The intricated movements of clay particles in water, however, may not be revealed enough by the only analysis of their mineralogical properties. The present report deals with that the clay minerals are supposed to be one simple plate and the particle associations of clay suspensions are analysed on the basis of newly developed DLVO theory.抄録全体を表示PDF形式でダウンロード (561K) -
特に斜プチロル沸石-輝沸石系ゼオライトの場合荻原 成騎1991 年 31 巻 2 号 p. 97-105
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーChemical compositions of zeolites have been analyzed by many researchers with various methods, such as wet chemical process, EPMA and XRF. Author try to evaluate the different analytical methods and correct the data analyzed on the basis of the evaluation. In the case of wet chemical process and EPMA, the corrected Al and Na values are more acceptable than original one respectively.
The interrelationships and chacteristics of chemical composition of clinoptilolite-heulandite series zeolite formed in three geological environment are presented and disscussed. Samples collected from deep sea oceanic sediments and alkaline saline lake sediments are characterized by extraframework cation exchange such as 2 (Na+K)⇔ICa+Mg+Ba+Sr. On the contrary, clinoptilolite and heulandite formed by burial diagenesis don't manifest cation exchange.抄録全体を表示PDF形式でダウンロード (2994K) -
Fe-セピオライトの鉱物学的研究・第2報坂本 尚史, 輿水 仁, 大塚 良平1991 年 31 巻 2 号 p. 106-113
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーFe-sepiolite was digested with large excesses of hydrochloric acid at constant temperature of 10, 25, and 40°C, for various time. The results were corn pared with the experimental data for Mg-sepiolite.
The acid dissolution of Fe-sepiolite found to be of first order with respect to residual Fe and Mg and also with respect to concentra tion of hydrochlori acid, as a whole. However, it also obeyed diffusion controlled kinetics proposed by Jan der (1927), especialy in the initial part of the reaction. The reaction rate for Fe in Fe-sepiolite was larger than for Mg in Fe-sepiolite. The activation energies for Fe and Mg in Fe-sepiolite obtained from the first order kinetic swere 18.1 and 16.9kcal/mol, respectively. These values were similar to that for Mg in Mg-sepiolite.抄録全体を表示PDF形式でダウンロード (2507K) -
吉田 明利, 小櫃 正道1991 年 31 巻 2 号 p. 114-121
発行日: 1991/08/30
公開日: 2011/09/20
ジャーナル フリーSilica sol is stable dispersions of discrete spherical silica particle in water, this particle has the size of 5-150nm. Various modified silica sols were prepared by adding lithium hydroxide to solica sol, and aging at 50°C.
Authors studied on the white turbid and solidification phenomena of silica sols modified with lithium hydroxide during sols were heated, and changes of viscosity and pH of sol were also measured.
Transparent or slight milk-white color of modified silica sol became white turbid at the temperature range of 55-95°C, and then solidified at almost the same temperature. This phenomena were observed at lower temperature in the sol with higher concentration of SiO2, and observed at the lowest temperature in the sol with SiO2/Li2O molar ratio 4.5-5, and highest temperature in the sol with SiO2/Li2O molar ratio 3.5-4. Solidification phenomena were only observed in the sol with above the 10wt% of SiO2.
In the case of sol below SiO2/Li2O molar ratio of 4, the white turbid and solidification phenomena were mainly resulted by the crystallization of Li2O·E2SiO2, and by gelation of ultra discrete spherical silica sol in the case above the ratio of 5.抄録全体を表示PDF形式でダウンロード (717K)
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