TY - JOUR
T1 - Plasmonic Trapping-Induced Crystallization of Acetaminophen
AU - Niinomi, Hiromasa
AU - Sugiyama, Teruki
AU - Uda, Satoshi
AU - Tagawa, Miho
AU - Ujihara, Toru
AU - Miyamoto, Katsuhiko
AU - Omatsu, Takashige
N1 - Funding Information:
This work was supported by Grant-in-Aid for JSPS Fellows Grant Number 15J11361, JSPS KAKENHI Grant-in-Aid for Young Scientists (B) Grant Number 16K17512, JSPS KAKENHI Grant-in-Aid for Early-Career Scientists Grant Number 18K14177, JSPS KAKENHI Grant-in-Aid for Scientific Research on Innovative Areas “Nano-Material Manipulation and Structural Order Control with Optical Forces” Grant Number JP 16H06507, JSPS KAKENHI Challenging Research (Exploratory) Grant Number JP 17K19070, JSPS KAKENHI Grant-in-Aid for Scientific Research (A) Grant Number JP18H03884, the joint usage/ research program of the Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University and the Ministry of Science and Technology in Taiwan under Contracts MOST106-2113-M-009-017-. We thank Mr. Kazuki Okano, Saitama University, Japan, and Mr. Yoichiro Mori for giving us fruitful discussion regarding crystallization of acetaminophen. We are grateful for Dr. Daiki Oshima, Nagoya University, Japan, for providing technical support for the usage of electron beam lithography.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/2/6
Y1 - 2019/2/6
N2 - We demonstrate that plasmonic trapping can control crystallization of acetaminophen from its aqueous solution. Irradiation of a focused continuous-wave near-infrared laser to a plasmonic Au nanolattice supporting a thin film of a saturated solution allowed acetaminophen molecules to crystallize in annular distribution with the center of the focal spot. The annularly distributed crystals can be spatially manipulated by changing the position of the laser focal spot. The annular pattern is rationalized by competition between electrical field gradient force as an attractive force to the focal spot and thermophoretic force as a repulsive force. It is also found that, upon stopping the laser irradiation, the crystals first transformed to highly concentrated droplets rather than directly dissolving to the solution. Relaxation of the droplets by self-diffusion to the solution followed to the crystal/droplet transformation. These two-step dissociation dynamics indicate that not only plasmonic trapping of the molecules but also the enhanced electrical field by surface plasmon contributes to drive the crystallization, and it has a possibility to show the reverse process of the two-step nucleation model. Our demonstration highlights the possibility that plasmonic trapping by designed near-field and temperature distribution can manipulate not only molecular assembly but also creation of functional crystalline materials in nanoscale.
AB - We demonstrate that plasmonic trapping can control crystallization of acetaminophen from its aqueous solution. Irradiation of a focused continuous-wave near-infrared laser to a plasmonic Au nanolattice supporting a thin film of a saturated solution allowed acetaminophen molecules to crystallize in annular distribution with the center of the focal spot. The annularly distributed crystals can be spatially manipulated by changing the position of the laser focal spot. The annular pattern is rationalized by competition between electrical field gradient force as an attractive force to the focal spot and thermophoretic force as a repulsive force. It is also found that, upon stopping the laser irradiation, the crystals first transformed to highly concentrated droplets rather than directly dissolving to the solution. Relaxation of the droplets by self-diffusion to the solution followed to the crystal/droplet transformation. These two-step dissociation dynamics indicate that not only plasmonic trapping of the molecules but also the enhanced electrical field by surface plasmon contributes to drive the crystallization, and it has a possibility to show the reverse process of the two-step nucleation model. Our demonstration highlights the possibility that plasmonic trapping by designed near-field and temperature distribution can manipulate not only molecular assembly but also creation of functional crystalline materials in nanoscale.
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U2 - 10.1021/acs.cgd.8b01361
DO - 10.1021/acs.cgd.8b01361
M3 - Article
AN - SCOPUS:85060279787
VL - 19
SP - 529
EP - 537
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 2
ER -