Synthesis of silica glass fibers and nanoparticles by continuous-wave laser backside irradiation
Synthesis of silica glass fibers and nanoparticles by continuous-wave laser backside irradiation
复制标题
连续波激光背面照射合成二氧化硅玻璃纤维和纳米颗粒
DOI：
10.1007/s00339-017-1242-5
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and Noboru Morita
中科院分区：
文献类型：
--
作者：
Namiko Saito;Hirofumi Hidai;Souta Matsusaka;Akira Chiba;and Noboru Morita
我们已经开发出一种新的方法来合成纤维和纳米二氧化硅玻璃使用连续波激光。合成过程通过玻璃基板的连续波激光背面照射（CW-LBI）来操作。在CW-LBI中，在玻璃块体中沿着光轴产生纺锤形发射;发射作为受限等离子体朝向光源传播。排放物及其周围环境包含汽化和熔融的玻璃。当激光照射持续足够的时间时，发射前沿到达玻璃表面，在该点处，汽化的熔融玻璃爆炸性地喷射。喷出的玻璃形成纤维和纳米颗粒。一些纳米颗粒在爆炸过程中附着在纤维表面。纤维直径从几百纳米到10 μm以上。纤维表面的颗粒直径为几十纳米。在喷射之后，纺锤形孔保留在玻璃基板中，其具有约3.8mm的深度。这一结果表明，喷出的材料源自玻璃体内部深处。喷射过程的高速摄像机观察和喷射材料的扫描电子显微镜表明，从熔融石英玻璃中提取形成的纤维和通过蒸发的石英玻璃聚集形成的颗粒。
We have developed a novel method to synthesize fibers and nanoparticles of silica glass using a continuous-wave laser. The synthesis process operates through continuous-wave laser backside irradiation (CW-LBI) of a glass substrate. In CW-LBI, a spindle-shaped emission is generated in the glass bulk along the optical axis; the emission propagates toward the light source as a confined plasma. The emission and its surroundings contain vaporized and molten glass. When the laser irradiation continues for a sufficient duration, the emission forefront reaches the glass surface, at which point vaporized and molten glass are ejected explosively. The ejected glass forms fibers and nanoparticles. Some of the nanoparticles become attached to the fiber surfaces during the explosion. The fiber diameters range from hundreds of nanometers to more than 10 μm. The particles on the fiber surfaces have diameters of tens of nanometers. A spindle-shaped hole remained in the glass substrate after the ejection, which had a depth of ~3.8 mm. This result indicated that the ejected materials originated from deep inside the glass bulk. High-speed camera observations of the ejection process and scanning electron microscopy of the ejected materials indicated that the fibers formed from the extraction from molten silica glass and particles formed by aggregation of vaporized silica glass.