Division of Frontier Materials Science, Graduate School of Engineering Science, and Center for Quantum Materials Science under Extreme Conditions, Osaka University, 1-3 Macikaneyama-cho, Toyonaka, Osaka 560-8531, Japan.
J Am Chem Soc. 2011 Sep 21;133(37):14472-5. doi: 10.1021/ja200737j. Epub 2011 Aug 30.
Controlling chemical reactions within a small space is a significant issue in chemistry, and methods to induce reactions within a desired position have various potential applications. Here we demonstrate localized, efficient photopolymerization by radiation pressure. We induced a one-photon UV polymerization of liquid acrylate solutions in the optical-trapping potential of a focused near-IR (NIR) laser beam, leading to the confinement of solidification to a minute space with dimensions smaller or equal to one-fifth of the wavelength of the NIR laser. Our approach can produce solidification volumes smaller than those achievable with conventional one-photon polymerization, thus enabling the production of tiny polymeric structures that are smaller than the diffraction limit of the trapping light. This is the first demonstration of a radiation pressure effect on a photochemical reaction.
在小空间内控制化学反应是化学领域的一个重大问题，而在期望位置引发反应的方法具有各种潜在应用。在这里，我们通过辐射压力展示了局部、高效的光聚合。我们在聚焦近红外（NIR）激光束的光阱势中诱导了液体丙烯酸盐溶液的单光子 UV 聚合，导致固化被限制在一个微小的空间内，其尺寸小于或等于 NIR 激光波长的五分之一。我们的方法可以产生比传统单光子聚合更小的固化体积，从而能够制造出比捕获光的衍射极限更小的微小聚合物结构。这是辐射压力对光化学反应影响的首次演示。
