Transport of micro-nano mass induced by laser on 1-D carriers
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摘要: 为了探索微纳米物质在1维载体上的可控输运问题, 采用聚焦激光辐射输运载体获得温度梯度的方法, 进行了微纳米石蜡球在单根碳纳米线圈上输运问题的实验研究和理论分析。结果表明, 温度梯度可以驱动碳纳米线圈上的微纳米石蜡由高温区域向低温区域移动, 即发生输运现象; 调整激光的聚焦位置可以实现输运方向的可控, 调节聚焦激光输出功率可以实现输运距离和输运质量的可控; 激光电流为33.0 mA, 36.0 mA, 39.0 mA, 42.0 mA时, 微纳米石蜡球输运距离分别为0.69 μm, 1.40 μm, 2.00 μm, 2.50 μm。该研究为微纳米物质的可控输运提供了新方法, 对进一步研究微纳米物质输运问题是有帮助的。Abstract: In order to explore the controllable transport of micro-nano mass in 1-D materials, a method that generate thermal gradient on carbon nanocoil by focused laser rays was adopted. Micro-nano paraffin transport process along thermally-induced carbon nanocoil irradiated by focused laser rays was analyzed experimentally and theoretically. The results show that when the laser is focused on the carbon nanocoil, the micro-nano paraffin sphere can be moved from the high temperature region to the low temperature region. The paraffin transport process in a single direction or in both directions along the carbon nanocoil can be controlled by changing the position of laser radiation. The mass and distance transported along carbon nanocoil can be controlled by adjusting the laser power. When the laser current is respectively 33.0 mA, 36.0 mA, 39.0 mA, and 42.0 mA, the transport distance of the micro-nano paraffin is 0.69 μm, 1.40 μm, 2.00 μm and 2.50 μm, respectively. These results present a new method for micro-nano mass transporting controllably on 1-D materials.
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Keywords:
- laser technique /
- mass transport /
- laser radiation /
- thermal gradient /
- carbon nanocoil
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图 1 a—碳纳米线圈团簇的SEM图片b—单根碳纳米线圈的SEM图片c—激光聚焦后微纳米石蜡球的SEM图片d—碳纳米线圈的喇曼图谱
Figure 1. a—SEM images of CNC aggregation b—SEM images of an individual CNC c—SEM image of micro-nano paraffin spheres after laser focusing d—Raman shift of CNC
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图 3 光诱导石蜡输运示意图
Figure 3. Diagram of paraffin transporting on a single CNC induced by laser
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图 4 微纳米石蜡球在输运载体上实现单方向输运的光学显微镜照片
Figure 4. Optical images of micro-nano paraffin transporting on conveyor irradiated by the focused laser rays in a single direction
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图 5 CCD摄像系统记录的微纳米石蜡球体在不同聚焦激光电流下输运距离的光学显微镜照片
Figure 5. Optical images of transmission distance of micro-nano paraffin with various laser currents
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图 6 CCD摄像系统记录的微纳米石蜡球的双方向输运过程的光学显微镜照片
Figure 6. Optical images of micro-nano paraffin focused by laser rays transporting on the conveyor in both directions
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图 7 红外碳纳米线圈在可见和红外光波段光学模拟
Figure 7. Simulation of CNCs irradiated by visible light and infrared light
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图 8 液相石蜡球在CNC基板表面所受界面张力模型示意图
Figure 8. Schematic diagram of interfacial tension for paraffin microsphere droplets on the surface of CNC substrate
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图 9 微流体通道内微米气泡的生成和输运
Figure 9. Optical images of micro-nano bubbles created and transported in fluidic micro-channel
表 1 石蜡输运过程中的相关参数变化
Table 1 Main parameters of paraffin transport process
laser current/mA transport distance/μm paraffin diameter/μm current increment/mA distance increment/μm volume decrement/% 33.0 0.69 2.40 3.0 0.71 56.0 36.0 1.40 1.80 3.0 0.60 54.0 39.0 2.00 1.40 3.0 0.50 60.0 42.0 2.50 — — — — 
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