Mesoporous Silica Microspheres Composited with SBA-15s for Resonance Frequency Reduction in a Miniat

• 作 者: ZHANG Xinyue CHE Shunai
• 机 构: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shang
• 出 处: 高等学校化学研究（英文版）
• 发表日期: 2020年5期
• 关键词: Mesoporous silica microsphere Microemulsion SBA-15 Resonance frequency offset

Microspheres composited with mesoporous SBA-15 particles and silica were investigated as fillers in miniature loudspeakers to study the factors influencing the resonance frequency offsets(RFOs).Mesoporous silica microspheres(MSMs) were prepared by self-assembling SBA-15 mesoporous silica in a microemulsion synthesis system.The formation process involved the fabrication of a stable O/W microemulsion of tetrabutyl orthosilicate(TBOS) and hexadecyltrimethylammoniurn bromide(C16TAB) and encapsulation of SBA-15s.The RFO increased and then decreased with increasing particle size(in the length range of 0.7-5.5 μm and in the width range of 0.2-0.45 μr),increased with increasing pore size(in the range of 7.0-9.4 nm) of SBA-15s,and increased with decreasing particle size(105-900 μm) of MSMs.