In Situ Observation of Chiral Symmetry Breaking in NaClO3 Chiral Crystallization Realized by Thermoplasmonic Micro-Stirring
In Situ Observation of Chiral Symmetry Breaking in NaClO3 Chiral Crystallization Realized by Thermoplasmonic Micro-Stirring
复制标题
热等离子体微搅拌实现 NaClO3 手性结晶中手性对称性破缺的原位观察
DOI：
10.1021/acs.cgd.8b00420
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发表时间：
2018
影响因子：
3.8
通讯作者：
Takashige Omatsu
中科院分区：
文献类型：
--
作者：
Hiromasa Niinomi;Teruki Sugiyama;Miho Tagawa;Shunta Harada;Toru Ujihara;Satoshi Uda;Katsuhiko Miyamoto;Takashige Omatsu
我们已经发现，大的手性对称性破缺的手性结晶可以通过照射几毫瓦聚焦激光的等离子体纳米晶格浸泡在停滞的NaClO3饱和水溶液中实现。与自发结晶相反，激光照射后溶液中出现了数百个具有相同旋向的手性晶体。在焦点附近的结晶的早期阶段的原位显微镜观察显示，微气泡的产生，其次是大的过饱和度的增加，其中过饱和度达到360%，促进几个数量的晶体成核在附近的气泡作为“母亲”晶体。微气泡的产生引起Marangoni对流，其速度达到每秒数百微米，通过微流体剪切将第一个出现的手性晶体粉碎成碎片。也就是说，由微流体剪切引起的二次成核放大了具有相同旋向性的“子”晶体的数量。这种利用激光实现的时空可控微观混合实验不仅为我们提供了一条连接光与手征对称性破缺的新途径，而且为我们提供了一种真实的实时观测二次成核早期动力学的新方法。
We have found that large chiral symmetry breaking in chiral crystallization can be achieved by irradiating a several milliwatts focused laser to a plasmonic nanolattice immersed in a stagnant NaClO3saturated aqueous solution. Several hundreds of chiral crystals with the same handedness showed up in the solution after the laser irradiation in contrast to spontaneous crystallization. In situ microscopic observation for the early stage of the crystallization in the vicinity of the focal spot revealed that microbubble generation followed by large supersaturation increase, in which supersaturation reaches 360%, promotes several numbers of crystal nucleation in the vicinity of the bubble as “mother” crystal. The generation of the microbubble induced Marangoni convection, the velocity of which reaches several hundreds of micrometers per second, crushing the first appearing chiral crystal into pieces by microfluidic shear. Namely, secondary nucleation caused by microfluidic shear amplified the number of “daughter” crystals with the same handedness. This spatiotemporally controllable micromixing experiment realized by laser irradiation gives us not only a novel route bridging a light and chiral symmetry breaking but also the novel method to observe the early stage dynamics of the secondary nucleation, which was hard to observe by conventional observation technique, in real time.