Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Sekine, Yurina
Geruka, Zonenzai No Tsukaikata To Atarashii Geru No Katsuyo Jirei, p.270 - 275, 2025/01
no abstracts in English
Kumada, Takayuki; Nakagawa, Hiroshi; Miura, Daisuke; Sekine, Yurina; Motokawa, Ryuhei; Hiroi, Kosuke; Inamura, Yasuhiro; Oku, Takayuki; Oishi, Kazuki*; Morikawa, Toshiaki*; et al.
Hamon, 34(2), p.50 - 53, 2024/05
Spin-contrast-variation (SCV) small-angle neutron scattering (SANS) enabled us to determine structure of nano-ice crystals that were generated in rapidly frozen sugar solution. In the frozen glucose solution, we found that the nano-ice crystals formed a planar structure with a radius larger than several tens of nanometers and a thickness of 2-3 nm, which was close to the critical nucleation size of ice crystals in supercooled water. This result suggests that the glucose molecules were preferentially bound to a specific face of nano-ice crystals, and then blocked the crystal growth perpendicular to that face.
Sekine, Yurina; Nankawa, Takuya; Hiroi, Kosuke; Oba, Yojiro*; Nagakawa, Yoshiyasu*; Sugita, Tsuyoshi; Shibayama, Yuki; Ikeda-Fukazawa, Tomoko*
Carbohydrate Polymers, 327, p.121538_1 - 121538_11, 2024/03
Times Cited Count：12 Percentile：87.28(Chemistry, Applied)We describe non-toxic, tough nanocellulose (NC) hydrogels formed from chemically unmodified NC by cellulose crystalline transformation and subsequent freeze cross-linking reaction. Using low-concentration NaOH and freezing together induced the crystalline transformation of NC from cellulose I to II via freeze concentration. After the crystalline transformation, cross-linking between the NC and CA in the freeze concentration layer (FCL) provided a strong NC network structure, forming NC hydrogels with high mechanical strength. The freeze-cross-linked NC hydrogel easily retained powder adsorbents in its inner space by mixing the NC-NaOH sol and the powder, and the hydrogel showed high removal efficiency for heavy metals. The results highlight the versatility of chemically unmodified celluloses in developing functional materials, suggest possible practical applications.
Sekine, Yurina
Fuain Kemikaru, 52(8), p.25 - 32, 2023/08
By using the freezing phenomenon, we discovered that a hydrogel with high compressive strength can be formed using only harmless materials, mainly carboxymethyl cellulose nanofibers. The key is the phase separation of ice crystals and solutes that occurs when aqueous solutions freeze. This paper describes the formation mechanism of the freeze crosslinked hydrogel and its properties.
Sekine, Yurina
Kata Gijutsu, 36(8), p.70 - 73, 2021/08
We developed a cross-linking method using freeze concentration and used it to synthesize a cellulose nanofiber hydrogel with high compressive strength. We will introduce the gelation mechanism and properties of the hydrogels in this article.
Koizumi, Satoshi; Monkenbusch, M.*; Richter, D.*; Schwahn, D.*; Annaka, Masahiko*
Journal of the Physical Society of Japan, Vol.70, Supplement A, p.320 - 322, 2001/05
no abstracts in English
Okoshi, Minoru
JAERI-Review 97-009, 32 Pages, 1997/08
JAERI-Review-97-009.pdf:1.24MB
no abstracts in English
Yamanoi, Tadayo*; ; ; ; Takato, Toshikazu*
PNC TJ7361 97-003, 188 Pages, 1997/02
no abstracts in English
Co using a specially designed cryostat for time differential coincidence emission Moessbauer spectroscopy of 
NpSaeki, Masakatsu; Nakada, Masami; ; Yoshida, Zenko; ; ; Yamashita, Toshiyuki; ;
Hyperfine Interactions, 92, p.1177 - 1181, 1994/00
Times Cited Count：7 Percentile：48.46(Physics, Atomic, Molecular & Chemical)no abstracts in English
Ito, Hitoshi
Hoshasen To Sangyo, 0(55), p.37 - 41, 1992/00
no abstracts in English
Okada, Takashi; Ouchi, Jin; Kondo, Isao; Nemoto, Takeshi
PNC TN8410 91-164, 4 Pages, 1991/09
None
Journal of Nuclear Science and Technology, 13(8), p.442 - 448, 1976/08
Times Cited Count：1no abstracts in English
-ray, 4; Temperature dependence of freezing quantity of stripes and a trial for thermal stress;
Nihon Kikai Gakkai Rombunshu, 35(269), p.31 - 39, 1969/00
no abstracts in English
佐野 雄一; 渡部 創; 宮崎 康典; 安倍 弘; 長谷川 健太
後藤 一郎*
JP, 2022-032647 Patent licensing information
【課題】粒子径が従来よりも大きく、粒子径の均一性が比較的高い粒子を製造することができる粒子製造方法を提供する。 【解決手段】本発明に係る粒子製造方法は、組成物を、振動するノズルから、撹拌機により撹拌された溶媒中に滴下し、組成物が含まれる粒子を造粒する造粒工程(ステップS1)と、前記造粒工程(ステップS1)で得られた溶媒を含む粒子から、溶媒を除去し、粒子を得る溶媒除去工程(ステップS2)と、を含むことを特徴とする。
Kumada, Takayuki
no journal, ,
no abstracts in English
Manabe, Sachi; Matsubara, Natsumi; Saegusa, Jun; Takeishi, Minoru
no journal, ,
no abstracts in English
Sekine, Yurina; Nankawa, Takuya
no journal, ,
Freezing of an aqueous solution containing a solute induces phase separation between the ice crystals and the solute, and a nanoscale freeze concentrated layer (FCL) surrounded by ice crystals is formed inside the frozen body. We have developed various cellulose-based functional hydrogel materials by using FCL as a reaction field to control the hierarchical structure of hydrogels. We discuss the gelation behavior and properties of freeze crosslinked hydrogels and their applications.
Abe, Kazuhide; Sugita, Asako; Sekine, Yurina; Nankawa, Takuya
no journal, ,
