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Yoshinori Katsuyama
Researcher at Hokkaido University
Publications - 13
Citations - 4133
Yoshinori Katsuyama is an academic researcher from Hokkaido University. The author has contributed to research in topics: Self-healing hydrogels & Microelectrode. The author has an hindex of 8, co-authored 13 publications receiving 3442 citations.
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Journal ArticleDOI
Double‐Network Hydrogels with Extremely High Mechanical Strength
Journal ArticleDOI
Biomechanical properties of high-toughness double network hydrogels.
Kazunori Yasuda,Jian Ping Gong,Yoshinori Katsuyama,Atsushi Nakayama,Yoshie Tanabe,Eiji Kondo,Masaru Ueno,Yoshihito Osada +7 more
TL;DR: This study demonstrated that the PAMPS-PDMAAm DN gel has an amazing wear property as a hydrogel that is comparable to the UHMWPE and showed that the Cellulose-Gelatin DN gel was not resistant to wear.
Journal ArticleDOI
Structural Characteristics of Double Network Gels with Extremely High Mechanical Strength
Yang Ho Na,Takayuki Kurokawa,Yoshinori Katsuyama,Hiroyuki Tsukeshiba,Jian Ping Gong,Yoshihito Osada,Satoshi Okabe,Takeshi Karino,Mitsuhiro Shibayama +8 more
Abstract: The dynamic aspect of double network (DN) gels showing an extremely high mechanical strength has been investigated by dynamic light scattering (DLS) measurements The DN gels are formed from highly cross-linked poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as the first network and loosely cross-linked (or non-cross-linked) polyacrylamide (PAAm) as the second network The results of DLS show that the presence of slow mode besides the gel mode (fast mode) enhances the strength of DN gels at the low cross-linking density of the second network The dynamics of the slow mode cannot be explained in terms of reptational motion of the second component in the first network, but it is similar to the translational motion of PAAm polymers in a semidilute solution A strong velocity dependence of the mechanical strength is observed at a shear rate close to the inverse of the relaxation time of the slow mode These results suggest that large “voids” of the first network may exist, and PAAm polymers that exist
Journal ArticleDOI
Friction of gels
TL;DR: In this article, the sliding friction of various kinds of hydrogels has been investigated, and it has been found that the frictional behaviors of these fluids do not conform to Amonton's law F = μW, which well describes the friction of a solid.
Journal ArticleDOI
Elastic-hydrodynamic transition of gel friction.
Takayuki Kurokawa,Taiki Tominaga,Yoshinori Katsuyama,Rikimaru Kuwabara,Hidemitsu Furukawa,Yoshihito Osada,Jian Ping Gong +6 more
TL;DR: The results indicate that the adsorption model proposed by the previous work is valid even under a pressure up to MPa orders, which is the order of pressure that a cartilage sustains in the articular joints.