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441.
Cole RM Sugawara Y Baumberg JJ Mahajan S Abdelsalam M Bartlett PN 《Physical review letters》2006,97(13):137401
A new self-aligned robust method for coupling to whispering gallery modes (WGMs) of submicron microspheres utilizes their periodic arrangement without relying on nanopositioned external coupling devices. The microspheres are embedded in a nanostructured gold surface supporting delocalized plasmonic crystal modes that mediate the coupling, and can be tuned by the geometry. Detailed measurements of the angle- and orientation-dependent reflectivity reveal localized plasmonic WGMs whose energies scale with sphere diameter and agree closely with Mie calculations. Coupling between these plasmonic WGMs leads to mode splitting and the formation of plasmonic minibands of a controllable bandwidth. 相似文献
442.
Sugawara Y Kelf TA Baumberg JJ Abdelsalam ME Bartlett PN 《Physical review letters》2006,97(26):266808
Hybrid emitting exciton-plasmonic composites are constructed by coating arrays of spherical nanovoids embedded in a gold film with organic semiconducting molecular J-aggregate films. In such plasmonic crystals, localized plasmons confined inside the voids can be excited. We report the first observation of polaritonic spectral narrowing and strong coupling between localized plasmons and J-aggregate excitons with Rabi splittings of 230 meV at room temperature. 相似文献
443.
Toyota T Tsuha H Yamada K Takakura K Yasuda K Sugawara T 《Langmuir : the ACS journal of surfaces and colloids》2006,22(5):1976-1981
Adding an artificial bolaamphiphile to a dispersion of giant multilamellar vesicles (GMVs) made of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine (POPC) induced a cup-shaped deformation in GMVs accompanied by partial extrusion of the inner vesicle; thereafter, the deformed vesicles returned to their original shape. On the other hand, when the artificial bolaamphiphile together with a surfactant was added to the vesicular dispersion, these deformation and reformation dynamics were transmitted from the outer membranes in GMVs to the inner membranes until an intact inner vesicle was extruded out of the outer membrane. The microscopic aspects of these processes were investigated using amphiphiles tagged with individual fluorophores. 相似文献
444.
Kuwahara D Koyano H Manaka T Nakamura H Mochida T Sugawara T 《The journal of physical chemistry. A》2006,110(51):13731-13735
We present a new NMR method to clarify the dynamics of proton tautomerism in solid 9-hydroxyphenalenone. Two 13C resonance lines influenced by the proton tautomerism have a chemical-shift difference between them, which increases with decreasing temperature. To depict the precise potential curve of the proton tautomerism, the chemical-shift difference when the proton tautomerism is completely frozen is necessary. For solid 9-hydroxyphenalenone and its derivatives, the freezing temperatures are often under -100 degrees C. When the freezing temperatures are below the temperature range in which standard magic angle spinning NMR probes can perform a sample spinning, it is very difficult to obtain the shift difference. The NMR experiments based on this new method are performed at a temperature significantly higher than -100 degrees C at which the proton tautomerism is still active. The new method yields the 13C spin relaxation rates, the rates for the proton tautomerism, and the populations of the two tautomers. Using the populations and the 13C chemical-shift difference at that temperature, we determined the chemical-shift difference at the freezing temperature. We also obtained several parameters characterizing the potential profile for the proton dynamics in solid 9-hydroxyphenalenone. 相似文献
445.
The biotransformation of (-)-guaiol (1) has been investigated by using plant parasite fungus, Eurotium rubrum. Compound 1 was oxidized at the C-2 position, and transformed to pancherione. 相似文献
446.
Polyolefin industry is now under a remarkable change of international supply-demand framework and its market is splitting into commodity and high performance products. It is getting more important for a material being harmless and comfortable, while the “life cycle cost”, which includes the cost during use and the recycle cost after use, is regarded as more important to evaluate a material. Those changes are accelerating the inter-material penetration. Several examples of the material design and production technologies, which responded to the changing market needs and developed new applications of polyolefin, are discussed. 相似文献
447.
We designed a screen-printed gold electrode (SPGE) with a peptide to detect cancer cells. The ability to sense circulating tumor cells (CTCs) and monitor their movement in blood vessels is important for cancer diagnosis. Human monocytic leukemia cells were selected as a model of CTCs because of their origin. The cell-recognition and cell-sensing peptide moieties were EICADP and Y4C. The SPGE was modified with the cell-recognition moieties of the CY4EICADPY4C in a bridge-type construction due to the cysteine residue at both terminals. The calibration curve was linear and ranged from 25 to 2,000 cells/mL with a LOD of 8 cells/mL. 相似文献
448.