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Beilstein Journal of Nanotechnology (1)
Journal of Synchrotron Radiation (1)
Takahara, Atsushi (2)
Cohen, Sidney R (1)
Harada, Yoshiko (1)
Hoshino, Taiki (1)
Ito, Kiminori (1)
Jinnai, Hiroshi (1)
Kikuchi, Moriya (1)
Ma, Wei (1)
Mitamura, Koji (1)
Murakami, Daiki (1)
Otsuka, Hideyuki (1)
Sagiv, Jacob (1)
Sasaki, Sono (1)
Takata, Masaki (1)
Tanaka, Yoshihito (1)
Yah, Weng On (1)
Year of Publication
X-ray photon correlation spectroscopy using a fast pixel array detector with a grid mask resolution enhancer
Journal of Synchrotron Radiation
The performance of a fast pixel array detector with a grid mask resolution enhancer has been demonstrated for X-ray photon correlation spectroscopy experiments.
The performance of a fast pixel array detector with a grid mask resolution enhancer has been demonstrated for X-ray photon correlation spectroscopy (XPCS) measurements to investigate fast dynamics on a microscopic scale. A detecting system, in which each pixel of a single-photon-counting pixel array detector, PILATUS, is covered by grid mask apertures, was constructed for XPCS measurements of silica nanoparticles in polymer melts. The experimental results are confirmed to be consistent by comparison with other independent experiments. By applying this method, XPCS measurements can be carried out by customizing the hole size of the grid mask to suit the experimental conditions, such as beam size, detector size and sample-to-detector distance.
X-ray photon correlation spectroscopy; grid mask resolution enhancer
Surface functionalization of aluminosilicate nanotubes with organic molecules
Yah, Weng On
Cohen, Sidney R
Beilstein Journal of Nanotechnology
The surface functionalization of inorganic nanostructures is an effective approach for enriching the potential applications of existing nanomaterials. Inorganic nanotubes attract great research interest due to their one-dimensional structure and reactive surfaces. In this review paper, recent developments in surface functionalization of an aluminosilicate nanotube, “imogolite”, are introduced. The functionalization processes are based on the robust affinity between phosphate groups of organic molecules and the aluminol (AlOH) surface of imogolite nanotubes. An aqueous modification process employing a water soluble ammonium salt of alkyl phosphate led to chemisorption of molecules on imogolite at the nanotube level. Polymer-chain-grafted imogolite nanotubes were prepared through surface-initiated polymerization. In addition, the assembly of conjugated molecules, 2-(5’’-hexyl-2,2’:5’,2’’-terthiophen-5-yl)ethylphosphonic acid (HT3P) and 2-(5’’-hexyl-2,2’:5’,2’’-terthiophen-5-yl)ethylphosphonic acid 1,1-dioxide (HT3OP), on the imogolite nanotube surface was achieved by introducing a phosphonic acid group to the corresponding molecules. The optical and photophysical properties of these conjugated-molecule-decorated imogolite nanotubes were characterized. Moreover, poly(3-hexylthiophene) (P3HT) chains were further hybridized with HT3P modified imogolite to form a nanofiber hybrid.
chemisorption; imogolite; inorganic nanotube; surface functionalization.
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