All issues
Predecessor
Volume 71, Issue 10
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
Comprehensive Papers
-
Yoshiro KANEKO2014 Volume 71 Issue 10 Pages 443-456
Published: October 25, 2014
Released on J-STAGE: October 24, 2014
JOURNAL FREE ACCESSThis paper deals with our recent work on the preparation of soluble ionic polysilsesquioxanes (PSQs) with regular structures, i.e. rod-like and ladder-like structures, by hydrolytic polycondensation (sol-gel reaction) of organotrialkoxysilanes containing functional groups, which changed to ionic groups, i.e. ammonium, carboxylate and sulfonate groups, during the reactions. In addition, we report on the preparation of ionic silsesquioxanes (SQs) with other structures, indicating characteristic properties, e.g. low-crystalline cage-like oligoSQ (POSS) and ionic liquid containing SQ framework, by hydrolytic condensation. Finally, the hybridization of an ammonium group-containing rod-like (ladder-like) PSQ with carbon nanotube and dye compounds, to approach to the functional materials, is described.View full abstractDownload PDF (1889K)
Original Papers
-
Keita KUROIWA, Chiharu HIGUMA, Yoshifumi SHIMOGAWA, Hiroshi HACHISAKO, ...2014 Volume 71 Issue 10 Pages 457-466
Published: October 25, 2014
Released on J-STAGE: October 24, 2014
JOURNAL FREE ACCESSAmphiphilic N-isopropylacrylamide (NIPAAm) oligomers with dodecyl groups and carboxyl groups were prepared using RAFT polymerization. The aqueous solutions of the amphiphiles become clouded upon heating at pH 4. However, there is no thermosensitivity such as clouding at pH 8, and the formation of vesicle networks leads to a stable state in aqueous solution. In addition, nanowires, nanorods, and nanoparticles were developed using metal ion and/or metal complexes with these oligomers solutions. In particular, NIPAAm oligomers/Cu2+ ion displayed thermosensitivity with color change, indicating a change of coordination structure. The concept of hybrids of NIPAAm oligomer and metal ions allows us to design flexible and functional supramolecular systems in water.View full abstractDownload PDF (1196K)
Notes
-
Yukihide SHIRAISHI, Makoto TANAKA, Hiroya SAWAI, Taeko OHGI, Naoki TOS ...2014 Volume 71 Issue 10 Pages 467-470
Published: October 25, 2014
Released on J-STAGE: October 24, 2014
JOURNAL FREE ACCESSNanoparticles stabilized by organic molecules have been receiving much attention for a decade because of their characteristic size between metal ions or atoms and bulk metal as well as their novel properties, which are expected to be applied to various fields. The merging of metal nanoparticles or nanotechnology in a wide sense into self-assembled systems such as liquid crystal displays (LCDs) may attract the attention of researchers who are interested in inaugurating new combinations of different fields. This study aims to synthesize poly(β-cyclodextrin)-stabilized zirconia nanoparticles and to use them in novel display materials. Poly(β-cyclodextrin)-stabilized zirconia nanoparticles prepared by an ultrasonic and microwave method have an average diameter of 1.6 nm. The response of twisted nematic cells in the presence of nanoparticles prepared by this method was faster than with nanoparticles prepared by the solvothermal method.View full abstractDownload PDF (510K) -
Tsuyoshi TADANO, Shota SUZUKI, Rui ZHU, Toru HOSHI, Daisuke SASAKI, To ...2014 Volume 71 Issue 10 Pages 471-474
Published: October 25, 2014
Released on J-STAGE: October 24, 2014
JOURNAL FREE ACCESSA transparent hybrid film with hydroxypropylcellulose (HPC, Mw: 1.0×105) and silica particles (SiO2, average diameter: 12.3 nm) was prepared by a solution cast method, based on the specific dispersion-agglomeration behavior of HPC/SiO2 nanohybrid aqueous suspensions. For the transparent suspension, with 10% of total weight of HPC and SiO2, when the weight composition of SiO2 is 0~30 wt %, free flow is maintained until the water evaporates and a high concentration is reached. Finally, a liquid crystal is formed, and the suspension becomes clouded. The transmittance of the film becomes 50~20% (400 nm). However, when the weight composition of SiO2 is 50~80 wt %, the transparent suspension gels, after a standing time which depends on concentration. A transparent hybrid film is formed with the state maintained. The transmittance of the film becomes 90%. It is thought this gelling happens due to the forming of hydrogen bonds between hydroxyl groups in HPC and the silanol groups on the SiO2 nanoparticle surface and that the SiO2 nanoparticles are dispersed in the network uniformly, leading to transparency.View full abstractDownload PDF (450K) -
Ryoji ICHIKAWA, Daiki WATANABE, Zenzo HOSHI, Hideyuki NAKANO2014 Volume 71 Issue 10 Pages 475-478
Published: October 25, 2014
Released on J-STAGE: October 24, 2014
JOURNAL FREE ACCESSIn order to create novel materials for use in rewritable displays, new hybrid films composed of poly(vinyl acetate) (PVAc) and quaternary salts have been investigated. It was found that hybrid films of PVAc-tetrabutylammonium tetrafluoroborate and PVAc-tetrabutylphosphonium tetrafluoroborate exhibited thermally reversible phase separation-dissolution behavior and the states at room temperature were controllable by thermal history. In addition, reversible display switching and fluorescence modulation were demonstrated by controlling the states of the films by thermal treatment.View full abstractDownload PDF (560K) -
Haruka KOGA, Saori SHINFUTSUKAICHI, Kohji NAKAZAWA2014 Volume 71 Issue 10 Pages 479-481
Published: October 25, 2014
Released on J-STAGE: October 24, 2014
JOURNAL FREE ACCESSAs a new substratum for cell culture, we designed a tissue culture plate that was coated with a near-infrared (NIR)-responsive composite gel. The gel was composed of agarose and gold-nanorods modified with polyethylene glycol (PEG). The agarose gel itself was no responsive to NIR irradiation. In contrast, gold-containing gel heated up during NIR irradiation. The temperature rise led to an instantaneous and localized solation of the composite gel, and consequently, selective cell-adhesive regions were formed on the tissue culture plate. NIH-3T3 cells adhered only to the solated regions, forming a cell micropattern. This technique also allows for stepwise cell patterning of and/or complex cell patterns. Therefore, this is a promising platform for cell culture applications such as stepwise co-culture and the study of cell migration.View full abstractDownload PDF (476K)
- |<
- <
- 1
- >
- >|