超声波作用下SiO<sub>2</sub>纳米颗粒的分离

任超宇; 薛鹏程; 焦雄; 王根伟

doi:10.11858/gywlxb.20180526

超声波作用下SiO₂纳米颗粒的分离

doi: 10.11858/gywlxb.20180526

任超宇^{1, 2,},
薛鹏程^{1, 2},
焦雄^{1, 2},
王根伟^{1, 2, 3,*,}

1.
太原理工大学应用力学与生物医学工程研究所, 山西太原 030024
2.
太原理工大学力学学院, 山西太原 030024
3.
力学国家级实验教学示范中心(太原理工大学), 山西太原 030024

基金项目:

国家自然科学基金 11772215

详细信息

作者简介:
任超宇(1991-), 男, 硕士, 主要从事微纳米力学研究.E-mail:15122346848@163.com

通讯作者:
王根伟(1974-), 男, 博士, 硕士生导师, 主要从事纳米结构和纳米复合材料力学研究

中图分类号: O647.4
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出版历程
- 收稿日期: 2018-03-13
- 修回日期: 2018-03-26

Separation of Two SiO₂ Nanoparticles under Ultrasonic Vibration

REN Chaoyu^{1, 2
,},
XUE Pengcheng^{1, 2},
JIAO Xiong^{1, 2},
WANG Genwei^{1, 2, 3,*
,}

1.
China Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
College of Mechanics, Taiyuan University of Technology, Taiyuan 030024, China
3.
National Demonstration Center for Experimental Mechanics Education(Taiyuan University of Technology), Taiyuan 030024, China

摘要

摘要: 在范德华力的作用下，纳米颗粒常常会黏在一起。黏在一起的纳米颗粒的分离提纯是纳米领域亟待解决的难题。研究了超声波作用下受到范德华力的两个SiO₂纳米颗粒的分离。假设颗粒处于空气中且是刚性的，给其中一个颗粒施加超声波振动，计算两个颗粒之间的范德华力和距离变化。结果表明，颗粒粒径比、超声波幅值、超声波周期、超声波平均能量密度对颗粒分离产生不同的影响。
- 范德华力 /
- 超声波 /
- 分离 /
- 纳米颗粒
Abstract: Nanoparticles tend to aggregate due to the van der Waals force, and the separation and purification of these nanoparticles are difficult in nanometer scale.In this study, we focus on the separation of two SiO₂ nanoparticles attracted by van der Waals force.Assuming them as being stiffness particles in air and applying ultrasonic vibration to one of them, we analyzed and calculated the interaction and distance between the two SiO₂ nanoparticles.It is found that the ratio of diameters, the amplitude, the period and the average energy density of the ultrasonic have different effects on their separation.
- van der Waals force /
- ultrasonic vibration /
- separation /
- nanoparticle

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图 1 几何关系

Figure 1. Schematic of geometric relations

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图 2 SiO₂纳米颗粒运动模型

Figure 2. Motion model of SiO₂ nanoparticles

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图 3 粒径比η对颗粒分离的影响

Figure 3. Influence of diameter ratio η on distance between two particles

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图 4 超声波振幅H对颗粒分离的影响

Figure 4. Influence of ultrasound amplitude H on distance between two particles

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图 5 周期T对颗粒分离的影响

Figure 5. Impact of ultrasound period T on distance between two particles

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图 6 相同超声波平均能量密度ζ下振幅H及周期T对颗粒分离的影响

Figure 6. Impact of ultrasound amplitude and period on distance between two particles with the same average energy density ζ

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表 1 Lennard-Jones势能参数

Table 1. Parameters of Lennard-Jones interaction potential

Atom type of interaction σ/nm ε/(10^-20 J)

Si-Si 0.330 4.3766

O-O 0.275 0.1104

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表 2 颗粒分离时间随粒径比η的变化关系

Table 2. Relationship of diameter ratio η and separation time of two particles

η Separation time/ps

0.1 843

0.5 249

1 180

5 139

10 94

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表 3 颗粒分离时间随振幅H的变化关系

Table 3. Relationship of ultrasound amplitude H and separation time of two particles

H/nm Separation time/ps

0.1 167

0.5 168

1 181

5 164

10 156

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表 4 颗粒分离时间随周期T变化关系

Table 4. Relationship of ultrasound period T and separation time of two particles

T/μs Separation time/ps

0.1 99

1 139

10 164

100 168

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