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Showing 1–7 of 7 results
Advanced filters: Author: Yuuki Hata Clear advanced filters

  • Artificial nanocelluloses are produced via the self-assembly of low-molecular-weight (LMW) cellulose in vitro and represent an emerging class of nanocelluloses developed over the past decade. Most artificial nanocelluloses reported to date are particulates. We have developed two types of nanostructured macroscopic materials through the self-assembly of LMW cellulose: nanoribbon network hydrogels and nanospiked microfibrous materials. This Focus Review summarizes our work along with related studies on these novel nanostructured cellulose materials.

    • Yuuki Hata
    ReviewsOpen Access
    Polymer Journal
    Volume: 58, P: 31-41

  • It is difficult to construct hydrogels with high stiffness at ultralow solid content. Here, low-molecular-weight cellulose was synthesized in the presence of cellulose-binding polysaccharides to construct stiff hydrogels that exhibit Young’s modulus of 386 kPa at a low solid content of 1.34% (w/v).

    • Yuta Sakurai
    • Yuuki Hata
    • Takeshi Serizawa
    ResearchOpen Access
    Communications Materials
    Volume: 6, P: 1-9

  • Cellulose-based hydrogels have attracted much attention due to their potential for a wide variety of applications. Recently, we demonstrated the production of nanoribbon network hydrogels through a crystallization-driven self-assembly of cellulose oligomers synthesized by enzymatic reactions under macromolecular crowding conditions. However, the detailed mechanism underlying hydrogel production remains unclear. This study investigated the effect of solution viscosity on hydrogel production by using a highly branched polymer, Ficoll. We propose that a certain level of solution viscosity is an essential requirement for hydrogel production.

    • Yuuki Hata
    • Toshiki Sawada
    • Takeshi Serizawa
    Research
    Polymer Journal
    Volume: 49, P: 575-581

  • We report controllable protein adsorption onto crystalline assemblies of carboxylated cello-oligosaccharides synthesized via enzyme-catalyzed oligomerization. Under various pH and ionic strength conditions, significant adsorption of basic proteins onto negatively charged cello-oligosaccharide assemblies was observed. Notably, we found that acidic proteins were adsorbed onto the cello-oligosaccharide assemblies at an acidic pH, which was significantly enhanced under low ionic strength conditions. Our findings demonstrate the electrostatic control of protein adsorption onto cello-oligosaccharide assemblies through adjustments to their surface properties and solution parameters.

    • Kai Sugiura
    • Akari Matsunami
    • Takeshi Serizawa
    Research
    Polymer Journal
    P: 1-10

  • Dissolved polymers directed molecular crystallization behavior under dilute and crowding conditions. Larger poly(ethylene glycol)s (PEGs) accelerated caffeine crystal formation in the dilute regime of PEG solutions, which was attributed to the depletion attraction that promoted caffeine cluster aggregation into crystal nuclei. In the semidilute regime, the crystal formation rate was insensitive to the molecular weight of PEGs. This observation was consistent with polymer blob properties, which govern depletion attraction and maintain a constant size at a given polymer concentration, irrespective of molecular weight in the semidilute regime.

    • Yuuki Hata
    • Xiang Li
    • Takamasa Sakai
    Research
    Polymer Journal
    Volume: 53, P: 633-642