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Ousaka, Naoki,Grunder, Sergio,Castilla, Ana M.,Whalley, Adam C.,Stoddart, J. Fraser,Nitschke, Jonathan R. American Chemical Society 2012 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.134 No.37
<P>A series of large, optically active Fe<SUB>4</SUB>L<SUB>6</SUB> cages was prepared from linear 5,5′-bis(2-formylpyridines) incorporating varying numbers (<I>n</I> = 0–3) of oligo-<I>p</I>-xylene spacers, chiral amines, and Fe<SUP>II</SUP>. When a cage was constructed from the ligand bridged by one <I>p</I>-xylene spacer (<I>n</I> = 1) and a bulky chiral amine, both a homochiral Fe<SUB>2</SUB>L<SUB>3</SUB> helicate and Fe<SUB>4</SUB>L<SUB>6</SUB> cage were observed to coexist in solution due to a delicate balance between steric factors. In contrast, when a less bulky chiral amine was used, only the Fe<SUB>4</SUB>L<SUB>6</SUB> cage was observed. In the case of larger cages (<I>n</I> = 2, 3), long-range (>2 nm) stereochemical coupling between metal centers was observed, which was minimally diminished as the ligands were lengthened. This communication was mediated by the ligands’ geometries and rigidity, as opposed to gearing effects between xylene methyl groups: the metal-centered stereochemistry was not observed to affect the axial stereochemistry of the ligands.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2012/jacsat.2012.134.issue-37/ja306615d/production/images/medium/ja-2012-06615d_0014.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja306615d'>ACS Electronic Supporting Info</A></P>
Thermal conductivity of PLA-bamboo fiber composites
Takagi, Hitoshi,Kako, Shuhei,Kusano, Koji,Ousaka, Akiharu The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.4
'Green' composites were fabricated from poly lactic acid (PLA) and bamboo fibers by using a conventional hot pressing method. The insulating properties of the PLA-bamboo fiber 'green' composites were evaluated by determination of the thermal conductivity, which was measured using a hot-wire method. The thermal conductivity values were compared with theoretical estimations. It was demonstrated that thermal conductivity of PLA-bamboo fiber 'green' composites is smaller than that of conventional composites, such as glass fiber reinforced plastics (GFRPs) and carbon fiber reinforced plastics (CFRPs). The thermal conductivity of PLA-bamboo fiber 'green' composites was significantly influenced by their density, and was in fair agreement with theoretical predictions based on Russell's model. The PLA-bamboo fiber composites have low thermal conductivity comparable with that of woods.