Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Takeno, Hiroyuki*; Uehara, Hiroki*; Murakami, Shozo*; Takenaka, Mikihito*; Nagasawa, Naotsugu
no journal, ,
We investigated the structural change during uniaxial stretching using time-resolved small-angle X-ray scattering for dynamically asymmetric polymer blends irradiated by electron beams. The concentration fluctuations were enhanced by stretching and become large especially along the direction of deformation. At the early stage of the stretch-induced enhancement of concentration fluctuations, their growth rate of 
-Fourier mode was found to have a maximum at a certain (=4
sin(
/2)/
), where and represent the scattering angle and wavelength of X-ray, respectively.
Masui, Tomomi; Shikinaka, Kazuhiro*; Kwon, H.*; Koizumi, Satoshi; Hashimoto, Takeji; Iwase, Hiroki; Kakugo, Akira*; Gong, J.*
no journal, ,
no abstracts in English
Zhao, Y.; Miyamoto, Nobuyoshi*; Koizumi, Satoshi; Hashimoto, Takeji
no journal, ,
In-situ and real-time observation of simultaneous living anionic polymerization process of isoprene (I) and styrene-d8 (S) in benzene-d6 as a solvent with sec-buthyllithium as an initiator into polyisoprene-block-polystyrene-d8 and the polymerization-induced self-assembling structures was carried out by a combination of UV-vis spectroscopy, gel permission chromatography (GPC), nuclear magnetic resonance (NMR) and Small-angle Neutron Scattering (SANS) experiments. The results revealed three time regions with time. In region 1, Only PI blocks were growing. In region 2, PS segments were formed and tapered structures were observed. In region 3, PS blocks were growing rapidly, and polymerization-induced microphase separation was observed.
Motokawa, Ryuhei; Koizumi, Satoshi; Tanaka, Fumihiko*; Koga, Tsuyoshi*; Winnik, F.*
no journal, ,
We report experimental results concerning about phase behaviors and self-assembled structures for an aqueous solution of hydrophobically modified (octadecyl modification) thelechelic poly(N-isopropylacrylamide) (HM-PNIPAM) in the parameter space of temperature and concentration. An aqueous solution of HM-PNIPAM exhibits various self-assembled structures, e.g., flower micelle and mesogrobule, due to the unique combination of PNIPA and alkyl chains, where the structure were investigated by an ultra small-angle and small-angle neutron scattering method.
Iwase, Hiroki; Koizumi, Satoshi
no journal, ,
We observed hierarchical structures of chicken red blood cells suspensions by using ultra-small-angle neutron scattering (USANS) with solvent contrast variation in order to selectively extract the structural information of the mainly components of red blood cell (RBC). Particularly we successfully observed hemoglobin in the RBC and also estimated the membrane thickness of the RBC.
Yamaguchi, Daisuke; Miyamoto, Nobuyoshi*; Koizumi, Satoshi; Hashimoto, Takeji; Nakato, Teruyuki*; Mayama, Hiroyuki*; Tsujii, Kaoru*
no journal, ,
The hierarchical structures composed of two-dimensional particles were observed via ultra-small-angle scattering method. We have investigated two systems: (1) exfoliated K
Nb
O
nanosheet colloidal dispersion, (2) porous silica fabricated from alkylketene dimer template. Although the physical and chemical structures and properties are largely different in these two systems, a similar point to them is regarded as below. The thickness of the constituent particles is ranging from a few nanometers to several tens of nanometers. Various fractal-like power-law scattering were obtained in the ultra-small angle scattering region reflecting the difference in the self-assembly of the particles.
Koizumi, Satoshi; Kondo, Tetsuo*; Tomita, Yoko*; Iwase, Hiroki; Yamaguchi, Daisuke; Hashimoto, Takeji
no journal, ,
no abstracts in English