基于动态光散射下纳米二氧化硅分散性的影响因素研究

doi:10.19964/j.issn.1006-4990.2021-0611

Abstract

Abstract:

Nano-silica is currently one of the most widely used nano-material，but its agglomeration behavior is disadvantageous to particle size measurement and application effect.In order to reduce the agglomeration behavior of silica nanoparticles，the dynamic light scattering particle size analysis method was applied to investigate the effect law of dispersion method，dispersant type and suspension conditions on the particle size and polydispersity index（PDI） of different silica nanoparticles.The experimental results showed that 0.1%（mass ratio） of PEG-2000 had a good dispersion effect on all kinds of nano-silica under stirring magnetic conditions.The particle size and PDI of silica sol suspensions showed a decreasing trend as the increased pH of suspension because the pH of suspension affected the dissolution equilibrium of silica sol，while the particle size and PDI of solid silica suspension showed a rising and then decreasing trend，which was due to the fact that the suspension pH affected the bilayer structure.In practical tests and applications，attention should be paid to the effect of suspension formulation conditions and the class of nano-silica on the particle size and PDI.

Key words: nano-silica, dispersion, dynamic light scattering, grain size analysis

CLC Number:

TQ127.2

LIU Hang,LIU Jianxin,SUN Yingsheng,DENG Junhui,CHEN Jinjian,GAO Chunyu. Study on influencing factors of dispersion of nano-silica under dynamic light scattering[J]. Inorganic Chemicals Industry, 2022, 54(8): 74-79.

Figures/Tables 13

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样品代号	表面性质	粒径/nm	样品代号	表面性质	粒径/nm
1#	亲水型	15	4#	亲水型	15
2#	亲水型	20	5#	疏水型	20
3#	亲水型	20	6#	疏水型	20

分散剂种类	PDI/%	D₅₀/nm	D₉₀/nm	粒径分布峰	有无团聚
PVP	23.20	36.77	119.04	双	有
STPP	23.94	29.60	152.03	双	有
MF	25.69	30.07	4 549.20	双	有
PEG-2000	21.17	29.71	54.53	单	无
空白	25.66	26.40	83.09	单	无

纳米SiO₂ 种类	PDI/ %	D₅₀/ nm	D₉₀/ nm	分布峰	有无团聚
1#	19.51	149.87	235.04	单	无
2#	21.17	29.71	54.53	单	无
3#	27.59	493.63	4 866.16	双	有
4#	35.36	1 081.11	1 314.45	单	无
5#	25.17	223.75	437.17	单	无
6#	31.00	1 236.11	1 686.28	双	有

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Study on influencing factors of dispersion of nano-silica under dynamic light scattering

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