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Volume 86, Issue 11
Displaying 1-4 of 4 articles from this issue
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Original Research Paper
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Yi-Hung LIN, Aya SAOTOME, Yoshiumi KOHNO, Masashi SHIBATA2013 Volume 86 Issue 11 Pages 397-402
Published: November 20, 2013
Released on J-STAGE: February 20, 2014
JOURNAL FREE ACCESSThe composites of an anthocyanin dye and a metal-containing mesoporous silica (MPS) were studied in order to obtain a brightly colored powders with high photostability. The MPS or Al-containing MPS barely adsorbed the anthocyanin dye (extracted from grape skin) present in an aqueous solution. Therefore, a hydrophobized anthocyanin (anthocyanidin) dye, prepared by removing the sugar chain of the anthocyanin via hydrolysis, was required to make the MPS adsorb the dye. Although the MPS did not adsorb the anthocyanidin dye present in an ethanol solution, the Al-containing MPS adsorbed the dye and yielded a bright red powder. The Fe-containing MPS adsorbed the anthocyanidin dye much more efficiently compared to the Al-containing MPS, and afforded a bright blue powder. Despite using the anthocyanidin dye without the sugar chain, which has an inhibiting effect on decomposition, the stability of the Al- or Fe-containing MPS composites under light irradiation was improved compared to that of an anthocyanin dye (not existing in the mesopore). The stability of Fe-containing MPS composite was particularly enhanced. In conclusion, we succeeded in obtaining a “blue pigment” derived from anthocyanin which is known to be difficult to stabilize.View full abstractDownload PDF (1009K)
Current Topics
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～Surface Design to Achieve Excellent Sliding Properties of Alkane Liquids and Practical Examples～Atsushi HOZUMI, Chihiro URATA, Benjamin MASHEDER2013 Volume 86 Issue 11 Pages 403-408
Published: November 20, 2013
Released on J-STAGE: February 20, 2014
JOURNAL FREE ACCESSExtensive research on hydrophobic/hydrophilic surface treatments has been thus far reported. Most have been focused on the maximum achievable static contact angle (CA) and minimum contact area between the probe liquid and the surface. In contrast to such research trends,recently the importance of dynamic CAs (advancing/receding CAs) and CA hysteresis (difference between advancing/receding CAs) have been recognized in terms of how easily liquids are removed from solid surfaces. Through control of CA hysteresis, we can realize excellent sliding properties even for organic liquids with low surface tensions without the use of perfluorinated compounds. In this article, by reviewing recent research trends and our own recent research results regarding oleophobic and superoleophobic treatments, we introduce a new concept to achieve low CA hysteresis surfaces showing low tilt angles of probe liquids.View full abstractDownload PDF (1822K)
Serial Lecture
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Orbital ViewsTakashi YUMURA2013 Volume 86 Issue 11 Pages 409-417
Published: November 20, 2013
Released on J-STAGE: February 20, 2014
JOURNAL FREE ACCESSIn this article, we will look at structure-function relationships in materials by using orbital symmetry and orbital interactions. In particular,we will focus on how electronic behaviors in materials are dependent on their structures from a viewpoint of molecular orbital theory, as well as how the electronic structures link to their functionality. For this purpose, we use group symmetry arguments to understand interactions of light with a simple molecule, which would determine its molecular structure and spin state. Relevant theoretical works on transition-metal active species inside a nanometer-sized cavity of zeolites will be introduced. Then we will discuss how properties of zeolite surfaces change catalytic function of the inner active species through the interactions. Finally, we will show roles of computational chemistry in constructing a strategy for a design for novel functional materials.View full abstractDownload PDF (2585K)
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Density Functional Theory Calculations（Ab Initio Calculations）Takashi YUMURA2013 Volume 86 Issue 11 Pages 418-427
Published: November 20, 2013
Released on J-STAGE: February 20, 2014
JOURNAL FREE ACCESSIn this article, we will look at how ab initio calculations, especially density functional theory (DFT) calculations, include electron correlation effects. Influence of electron correlation on geometrical and electronic structures of materials will be discussed by using a simple molecule. Also we will briefly summarize key parameters affecting the reliability of computations. Based on these computational backgrounds, DFT studies on chemical functionalization of nanotubes will be introduced. The functionalization, on which we will focus, can be distinguished by whether it can form covalent bonds or not, as well as whether functional groups interact with an inner or outer surface of nanotubes. Then, we will look at the recent development of a novel DFT functional, which can accurately model dispersion force operating between a host nanotube and a guest molecule. Finally, we will show the importance of recent computational chemistry in researches dealing in surface science.View full abstractDownload PDF (2142K)
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