Nano-foaming Process Induced by Electromagnetic Wave

电磁波或辐射在硬质玻璃基质中的瞬时加热可触发纳米气球结构的形成。由于溶胶-凝胶法有利于在硬化基质中残留少量的低分子物质，所以采用溶胶-凝胶法制备起始硬基质。在这个过程中，低分子物质形成气态物质，以各向同性几何形状取代周围的硬基质。结果，各向同性的球状空洞随处可见。这些结构最显著的特征是它们往往最小保持在100 nm，这表明这些气球状结构的相互结合受到了抑制。一项辅助工作正在进行中，以将这些具有纳米级球形空隙的材料加工成细粉。从这些运动学行为初步探讨了所得粉末的性质。

Instantaneous application of heat in hard glassy matrices induced by electromagnetic wave or radiation can trigger the formation of nano-sized balloon structure. The starting hard matrix was prepared by the sol-gel method since that method is advantageous to render a quite slight amount of low-molecular-weight species remain in the hardened matrix. In this process, low-molecular-weight species forms gaseous species that displace the surrounding hard matrix in an isotropic geometry. As a result of that, isotropic spherical voids are ubiquitously yielded. The most marked feature of those structures is that they tend to remain as small as 100 nm at most, which indicates the suppression of the mutual coalescence of those balloon-like structures. An auxiliary work is ongoing to process those materials with the nano-sized spherical voids into fine powder. The features of the obtained powders are preliminarily investigated form those kinematical behavior.