Using the mixture of polyacrylic acid (PAA),ammonia and water (H2O) as template,NH+4 on the surface of the template catalyzed the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) to form hollow silica nanoparticles (HSNPs).The morphology,particle size and distribution of HSNPs,the ζ potential of PAA/NH4OH template,as well as the content of free ammonia in the template solution were studied by TEM,particle size analysis,zeta potential analysis and UV absorption.The results showed that the amount of PAA determined the size of the template,affected the size of HSNPs and size distribution of HSNPs in the meantime.Using the template solution without H2O,when the relative dosage amount of PAA in the template emulsion was 0.2mmol/L,the pre-ammoniated template was relatively uniform,and in that case,the average size of the obtained HSNPs was about 179.9nm and the width of size distribution was 5.5nm.With the increase of the amount of H2O in the pre-ammoniation stage,the size of the template decreased and the average size of HSNPs was reduced from 179.9nm to 106.0nm.The addition of H2O played an important role in preparing HSNPs with good monodispersity.When the amount of H2O was 3mL,the size distribution of HSNPs was the narrowest of about 1.2nm.
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基金资助
西南科技大学龙山学术人才科研支持计划(17LZX601;18LZX547)
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