TY - JOUR
T1 - Dynamic Coupling of Optically Evolved Assembling and Swarming of Gold Nanoparticles with Photothermal Local Phase Separation of Polymer Solution
AU - Aibara, Issei
AU - Huang, Chih Hao
AU - Kudo, Tetsuhiro
AU - Bresolí-Obach, Roger
AU - Hofkens, Johan
AU - Furube, Akihiro
AU - Masuhara, Hiroshi
N1 - Funding Information:
This work is supported by Ministry of Science and Technology, Taiwan (Grant No. MOST 109-2634-F-009-028) and the Center for Emergent Functional Matter Science of National Chiao Tung University from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. Thanks are also due to funding by Ministry of Science and Technology (MOST) of Taiwan (MOST 108-2113-M-009-015- to H.M. and MOST 108-2112-M-009-008- to T.K.). J.H. gratefully acknowledges the financial support of the Flemish Government through long-term structural funding Methusalem ((CASAS2, Meth/15/04). I.A. is thankful for the Nichia-Scholarship from Tokushima University, and R.B.-O. is thankful for the Fonds Wetenschappelijk Onderzoek-Vlaanderen for postdoctoral (12Z8120N) and long stay abroad (V413820N; Taiwan) fellowships. We acknowledge Prof. Shuichi Hashimoto of Tokushima University for his kind setting of this international collaboration project.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/7/30
Y1 - 2020/7/30
N2 - Optical trapping of gold nanoparticles (Au NPs) at a glass/solution interface initially generates a periodically aligned structure of a few NPs along the direction perpendicular to a linearly polarized laser. When the number of NPs was increased, this alignment was expanded to the outside of the irradiated focus, forming a single large assembly where the Au NPs dynamically fluctuated like a swarming of bees. The morphology was dumbbell-shape, consisting of two swarms at both sides of the focus, and its size reached about 10 μm. This optically evolved assembling and swarming was studied in poly(N-isopropylacrylamide) (PNIPAM) solution, where liquid-liquid phase separation (LLPS) was induced by photothermal heating of the trapped Au NPs forming a microdroplet of highly concentrated PNIPAM. Dynamic coupling of the NPs assembling and swarming with the droplet formation of PNIPAM leads to cooperative optical evolution, through which the assembly was embedded in the single microdroplet.
AB - Optical trapping of gold nanoparticles (Au NPs) at a glass/solution interface initially generates a periodically aligned structure of a few NPs along the direction perpendicular to a linearly polarized laser. When the number of NPs was increased, this alignment was expanded to the outside of the irradiated focus, forming a single large assembly where the Au NPs dynamically fluctuated like a swarming of bees. The morphology was dumbbell-shape, consisting of two swarms at both sides of the focus, and its size reached about 10 μm. This optically evolved assembling and swarming was studied in poly(N-isopropylacrylamide) (PNIPAM) solution, where liquid-liquid phase separation (LLPS) was induced by photothermal heating of the trapped Au NPs forming a microdroplet of highly concentrated PNIPAM. Dynamic coupling of the NPs assembling and swarming with the droplet formation of PNIPAM leads to cooperative optical evolution, through which the assembly was embedded in the single microdroplet.
UR - http://www.scopus.com/inward/record.url?scp=85089874376&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.0c02777
DO - 10.1021/acs.jpcc.0c02777
M3 - Article
AN - SCOPUS:85089874376
SN - 1932-7447
VL - 124
SP - 16604
EP - 16615
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 30
ER -