Optical trapping-induced crystallization promoted by gold and silicon nanoparticles.

IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Photochemical & Photobiological Sciences Pub Date : 2024-09-01 Epub Date: 2024-08-30 DOI:10.1007/s43630-024-00622-6
Hao-Tse Su, Shao-Yuan Liu, Minoru Fujii, Hiroshi Sugimoto, Yoshito Y Tanaka, Teruki Sugiyama
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Abstract

This study investigates the promotion of sodium chlorate (NaClO3) crystallization through optical trapping, enhanced by the addition of gold nanoparticles (AuNPs) and silicon nanoparticles (SiNPs). Using a focused laser beam at the air-solution interface of a saturated NaClO3 solution with AuNPs or SiNPs, the aggregates of these particles were formed at the laser focus, the nucleation and growth of metastable NaClO3 (m-NaClO3) crystals were induced. Continued laser irradiation caused these m-NaClO3 crystals to undergo repeated cycles of growth and dissolution, eventually transitioning to a stable crystal form. Our comparative analysis showed that AuNPs, due to their significant heating due to higher photon absorption efficiency, caused more pronounced size fluctuations in m-NaClO3 crystals compared to the stable behavior observed with SiNPs. Interestingly, the maximum diameter of the m-NaClO3 crystals that appeared during the size fluctuation step was consistent, regardless of nanoparticle type, concentration, or size. The crystallization process was also promoted by using polystyrene nanoparticles, which have minimal heating and electric field enhancement, suggesting that the reduction in activation energy for nucleation at the particle surface is a key factor. These findings provide critical insights into the mechanisms of laser-induced crystallization, emphasizing the roles of plasmonic heating, particle surfaces, and optical forces.

Abstract Image

金和硅纳米粒子促进的光学诱捕结晶。
本研究探讨了通过添加金纳米粒子(AuNPs)和硅纳米粒子(SiNPs)促进氯酸钠(NaClO3)结晶的光学诱捕作用。在含有金纳米粒子(AuNPs)或硅纳米粒子(SiNPs)的饱和 NaClO3 溶液的空气-溶液界面上使用聚焦激光束,在激光焦点处形成这些粒子的聚集体,诱导可移动 NaClO3(m-NaClO3)晶体的成核和生长。持续的激光照射使这些 m-NaClO3 晶体反复经历生长和溶解循环,最终过渡到稳定的晶体形态。我们的比较分析表明,与 SiNPs 的稳定行为相比,AuNPs 因其更高的光子吸收效率而显著升温,导致 m-NaClO3 晶体的尺寸波动更为明显。有趣的是,在尺寸波动步骤中出现的 m-NaClO3 晶体的最大直径是一致的,与纳米粒子的类型、浓度或尺寸无关。使用聚苯乙烯纳米粒子也能促进结晶过程,因为这种粒子的加热和电场增强作用最小,这表明粒子表面成核活化能的降低是一个关键因素。这些发现为激光诱导结晶的机制提供了重要见解,强调了等离子加热、粒子表面和光学力的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Photochemical & Photobiological Sciences
Photochemical & Photobiological Sciences 生物-生化与分子生物学
CiteScore
5.60
自引率
6.50%
发文量
201
审稿时长
2.3 months
期刊介绍: A society-owned journal publishing high quality research on all aspects of photochemistry and photobiology.
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