Microscopic structural changes during the freeze cross-linking reaction in carboxymethyl cellulose nanofiber hydrogels

Miura, Daisuke*; Sekine, Yurina; Nankawa, Takuya; Sugita, Tsuyoshi; Oba, Yojiro; Hiroi, Kosuke; Ozawa, Tatsuhiko

Carbohydrate Polymer Technologies and Applications (Internet), 4, p.100251_1 - 100251_9, 2022/12

https://doi.org/10.1016/j.carpta.2022.100251

The reaction mechanism of carboxymethyl cellulose nanofiber (CMCF) hydrogel formed by freeze-crosslinking was investigated. We succeeded in observing the hierarchical structural changes during the freeze-crosslinking reaction. Freeze-crosslinked CMCF hydrogels exhibited a characteristic hierarchical alignment structure from the angstrom to micrometer scale that differed from normal cross-linked CMCF hydrogels produced by a conventional method without freezing. It was shown that the characteristic hierarchical structure contributes the excellent mechanical properties of freeze-crosslinked CMCF hydrogels.

Hierarchically self-organized dissipative structures of filler particles in poly(styrene--butadiene) rubbers

Yamaguchi, Daisuke; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*; Noda, Yohei*; Koizumi, Satoshi*; Hashimoto, Takeji*

Macromolecules, 50(19), p.7739 - 7759, 2017/10

https://doi.org/10.1021/acs.macromol.7b01052

We elucidated the spatial distribution of filler particles in cross-linked poly(styrene--butadiene) rubbers (SBR) developed under a typical fillers/rubbers compounding process as one of dissipative structures formed under a stress field imposed on the given system. The dispersion state of the fillers in SBR was clarified on the basis of hierarchical structures consisting of five structure levels. More specifically, it has the following characteristics depending on the specific interactions: Small, compact clusters build up compact mass-fractal structures, while large, loose clusters build up open mass-fractal structures.

None

*; *; Kataoka, Shinichi*; Nemoto, Kazuhiko*; Yanagisawa, Ichiro*; Fukui, Hiroshi*; Doi, Motoo*

PNC TJ1216 97-006, 202 Pages, 1997/03

PNC-TJ1216-97-006.pdf:10.03MB

None

Hierarchical structure assembled by coordination species in biphasic solvent extraction

Motokawa, Ryuhei; Kobayashi, Toru; Endo, Hitoshi*; Suzuki, Shinichi; Yaita, Tsuyoshi; Heller, W. T.*

no journal, , 

no abstracts in English

Optimizing P2P network hierarchies for visual analytics

Wu, H.-Y.*; Takahashi, Shigeo*; Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*

no journal, , 

In recent years, file-sharing applications have been widely used, and demand for analysis of the log data from the file-sharing process has increased. Visualization techniques are effective for the analysis of such log data. In this study, we propose a new node layout method for analyzing the file-sharing process using the network hierarchical optimization.

A Telescoping view of solute architectures in a hydrometallurgical chemical separation systems; Elucidation of a third-phase formation

Motokawa, Ryuhei

no journal, ,