巻号一覧
40 巻 (2000 - 2001)
- 4 号 p. 218-
- 3 号 p. 152-
- 2 号 p. 66-
- 1 号 p. 1-
40 巻, 3 号
選択された号の論文の7件中1～7を表示しています
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橋爪 秀夫2001 年 40 巻 3 号 p. 152-158
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーThe contribution of clay minerals to the chemical evolution in the early eath was reviewed. The roles of the clay mineral in the chemical evolution have been studied since Bernal (1949) suggested that the clay mineral was one of important materials to the origin of life. Many reseachers showed that the clay mineral in the process of the chemical evolution adsorbed an organic compound, concentrated it and acted as a catalyst to synthesize an organic molecule from inorganic molecules and to polymerize the organic molecule. A new possible utility of clay minerals, for example a cell made of a clay mineral is introdced here.抄録全体を表示PDF形式でダウンロード (958K) -
宇佐美 久尚, 藤松 仁2001 年 40 巻 3 号 p. 159-165
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーArtificial molecular assemblies to modify photosynthesis have been a dreamy target for many scientists. Clay mineral can be a candidate for molecular assembly system to make effective photoelectrontransfer reaction-a basic process of the photpsynthesis. The remarkable characteristics of clay minerals for the photoelectrontransfer can be classified as follows; 1) molecular aggregation in an antiparallel fashion, 2) high polarity to stabilize polar intermediates in photoinduced charge separated state and 3) applicability to many kinds of molecules by adjusting the basal spacing. The layered crystalline structure of clays can also work as a backbone building block in multilayered supramolecular systems.抄録全体を表示PDF形式でダウンロード (2632K) -
島津 省吾2001 年 40 巻 3 号 p. 166-172
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーClay-supported metal complexes were prepared by various methods such as cation exchange, chemically anchored ligand, and interlayer-polymerized ligand methods. Multiple modification of smectites with metal complexes and various organic guests (tuning guests) can be applied to the preparation of catalysts for the molecular recognition reactions such as shape selective, chemoselective, regioselective, and asymmetric hydrogenations. Especially, chiral Rh-phosphine complexes intercalated in taeniorite with structural tuning guests exhibited notably high activity and high selectivity in the asymmetric hydrogenation of acetophenone due to the larger open space in their interlayer structure.抄録全体を表示PDF形式でダウンロード (2613K) -
成田 榮一2001 年 40 巻 3 号 p. 173-178
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーIncreasing attention has been focused on the interaction between organic compounds and layered double hydroxides (LDHs) from viewpoints of separation, recover and concentration of organic substances, removal of harmful substances, retention of useful components, synthesis of porous materials etc. Recently, the intercalation of the biomolecules in living systems such as amino acids, polypeptides, sugars and nucleic acids into LDHs was also attempted from viewpoint of earth chemistry in which LDHs were regarded as anionic clays. In this article, the studies on the intercalation of the biomolecules mentioned above into LDHs were carried out and summarized together with the results of the recent researches on the intercalation of amino acids and sugars. As the results, not only anion but zwitterion of amino acids and non-ionic molecule of sugars were intercalated into the interlayer of Zn-Al and Mg-Al LDHs with indicating the selectivity by the kind of side chain group in the case of amino acids and by the number and configuration of hydroxide group in the case of sugars. It was also found that these organic compounds were deintercalated by the ion exchange with carbonate ion in which the parents LDHs were regenerated.抄録全体を表示PDF形式でダウンロード (752K) -
宮原 和己, 大坪 政美, 中石 克也, 足立 泰久2001 年 40 巻 3 号 p. 179-184
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーThe settling rate of the interface between sodium montmorillonite sediment and supernatant liquid was measured under a condition of high ionic strength as a function of solid volume fraction. The results were analyzed using the method of Michaels and Bolger to elucidate the physical indexes of flocculated sediment such as the settling velocity (Qf), the representative diameter (df), and the increase ratio of effective volume fraction (α) of floc. The applicability of this method to sodium montmorillonite was confirmed bycomparing the Qf and df values obtained from this method with those from the direct measurement previously reported. The floc of sodium montmorillonite retains more water compared with that of kaolinite and other materials.抄録全体を表示PDF形式でダウンロード (609K) -
フェルナンド スターリン, 北川 隆司, 地下 まゆみ2001 年 40 巻 3 号 p. 185-196
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーThe climate conditions in Sri Lanaka are briefly divided into three zones (wet, dry and intermediate), based on the average annual rainfall. Three typical weathered charnokite outcropswere selected in each zone.
Weathering products formed from charnockitic rock distributed in three different climate were investigated by means of X-ray diffraction, Differential thermal analysis (DTA), Transmission electron microscopy (TEM), Scanning electron microscopy (SEM) and X-ray fluorescence analysis.
In wet zone, vermiculite and kaolin mineral accompanied with gibbsite and goethite were formed. Vermiculite, interstratified mineral of biotite and vermiculite, smectite, halloysite and kaolinite were occurred in the outcrop of dry zone. On the other hand, only kaolinite and halloysite were formed in the intermediate zone. According to these results, the sequences of the formation of clay minerals in each zone are as follows;
Wet zone: vermiculite → kaolinite → gibbsite.
Halloysite →
Intermediate zone: halloysite → kaolinite.
Dry zone: biotite/vermiculite → vermiculite
Smectite → kaolinite
Halloysite →
Based on the chemical analysis, a clearly different alteration trend in the dry zone compared with the wet and intermediate zones is recognized. The Chemical Intensity of Alteration ofthe most weatheredparts of charnokitic rocks in the wet, intermediate and dry zones indicates 100, 98 and less than 70, respectively.
According to these results, alteration pathways from fresh to weathered charnokaitic rocks are clearly different under each climate conditions.抄録全体を表示PDF形式でダウンロード (5858K) -
河野 元治2001 年 40 巻 3 号 p. 197-211
発行日: 2001/02/28
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (3841K)
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