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Binks B.P.,University of Hull | Sekine T.,Shiseido Research Center Shin Yokohama | Tyowua A.T.,University of Hull
Soft Matter | Year: 2014

A series of platelet sericite particles coated to different extents with a fluorinating agent has been characterised and their behaviour in mixtures with air and oil studied. The material which forms by vigorous shaking depends on both the surface tension of the oil and the surface energy of the particles which control their degree of wetting. Oil dispersions are formed in liquids of relatively low tension (<22 mN m-1), e.g. hexane and cyclomethicone, for all particles. Particle-stabilised air-in-oil foams form in liquids of higher tension, e.g. dodecane and phenyl silicone, where the advancing three-phase contact angle θ, measured on a planar substrate composed of the particles into the liquid, lies between ca. 65° and 120°. For oils of tension above 27 mN m-1 like squalane and liquid paraffin with particles for which θ > 70°, we have discovered that dry oil powders in which oil drops stabilised by particles dispersed in air (oil-in-air) can be prepared by gentle mixing up to a critical oil:particle ratio (COPR) and do not leak oil. These powders, containing up to 80 wt% oil, release the encapsulated oil when sheared on a substrate. For many of the systems forming oil powders, stable liquid oil marbles can also be prepared. Above the COPR, catastrophic phase inversion occurs yielding an ultra-stable air-in-oil foam. We thus demonstrate the ability to disperse oil drops or air bubbles coated with particles within novel materials. © 2014 The Royal Society of Chemistry. Source


Joichi A.,Shiseido Research Center Shin Yokohama | Nakamura Y.,Shiseido Research Center Shin Yokohama | Haze S.,Shiseido Research Center Shin Yokohama | Ishikawa T.,Takasago International Corporation Corporate Research and Development Division | And 3 more authors.
Flavour and Fragrance Journal | Year: 2013

The volatile constituents of 'Blue Moon' and 'Blue Perfume' rose flowers, which, on an olfactory basis, are classified as a 'blue type' were analysed using Aromascope® technology (modified headspace technology) and solvent extraction methods followed by gas chromatography-mass spectrometry analysis. One hundred and eighty components were identified in the headspace volatile components of 'Blue Moon' flower and 188 components were identified in solvent extracts. Among them, geraniol, nerol, citronellol, 1,3-dimethoxy-5-methylbenzene and dihydro-β-ionol were identified as the main odour components. On the other hand, in 'Blue Perfume', 165 components were identified in the headspace volatile components and 150 components were identified in solvent extracts. Among them, geraniol, nerol, citronellol, neral, and geranial were identified as the major odour compounds. From both rose flowers, three components were newly identified: 2-isopropyl-4-methylthiazole, (Z)-cyclododec-9-enolide (yuzu lactone), and methyl cis-(Z)-jasmonate. 2-Isopropyl-4-methylthiazole and methyl cis-(Z)-jasmonate were identified in both of the headspace components and solvent extracts of the two types of rose flower, and then yuzu lactone was identified only in solvent extracts as the one of the minor components. Several components identified in both flowers have asymmetric carbon atoms in their molecules, leading us to analyse their chirality. For the first time, the enantiomer ratios of linalool, (E)-nerolidol, theaspiranes and dihydro-β-ionol could be assigned by multi-dimensional gas chromatography-mass spectrometry. The results were as follows in both rose flowers. The ratio of the (S)-enantiomer vs. the (R)-enantiomer of linalool was 8:92. Only the (S)-enantiomer was detected for (E)-nerolidol and dihydro-β-ionol. The ratios of the (2R,5R)-enantiomer vs. the (2S,5S)-enantiomer in theaspirane A and the (2R,5S)-enantiomer vs. the (2S,5R)-enantiomer in theaspirane B were about 4:96. © 2013 John Wiley & Sons, Ltd. Source

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