title: Fabrication of Thermoresponsive Nanoactinia Tentacles by a Single Particle Nanofabrication Technique.
abstract: Nanowires that are retractable by external stimulus are the key to fabrication of nanomachines that mimick actinia tentacles in nature. A single particle nanofabrication technique (SPNT) was applied over a large area to the fabrication of retractable nanowires (nanoactinia tentacles) composed of poly(N-isopropylacrylamide) (PNIPAM) and poly(vinylpyrrolidone) (PVP), which are thermoresponsive and hydrophilic polymers. The nanowires were transformed with increasing temperature from rod-like- to globule-forms with gyration radii of ∼1.5 and ∼0.7 μm, respectively. The transformation of the nanowires was reversible and reproducible under repeated cycles of heating and cooling. The reversible transformation was driven by hydration and dehydration of PNIPAM, the thermoresponsive segments, resulting in coil-to-globule transformation of the segments. The nanoactinia tentacle systems trapped the nanoparticles as a model of living cells under thermal stimulation, and the trapping was controlled by temperature. We present herein a unique nanomachine system which can be applicable to nanoparticle filtering/sensing systems and expandable to large-area functionalization and demonstrate polymer-based nanoactuators via scaling of molecular level coil-to-globule transformation into micron-sizes.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamada-oka, Suita 565-0871, Japan.|Center for Collaborative Research, Anan National College of Technology , 265 Aoki Minobayashi, Anan, Tokushima 774-0017, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Omichi
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamada-oka, Suita 565-0871, Japan.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Marui
authors.affiliation: Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Vikas S
authors.initials: VS
authors.lastname: Padalkar
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamada-oka, Suita 565-0871, Japan.|Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Akifumi
authors.initials: A
authors.lastname: Horio
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tsukuda
authors.affiliation: Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute , 1233 Watanuki-machi Takasaki, Gunma 370-1292, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Sugimoto
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamada-oka, Suita 565-0871, Japan.|Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Shu
authors.initials: S
authors.lastname: Seki