A New Method for the Preparation of Monoporous Hollow Microspheres

被引:106
作者
Chang, Ming-Wei [1 ]
Stride, Eleanor [1 ]
Edirisinghe, Mohan [1 ]
机构
[1] UCL, Dept Mech Engn, London WC1E 7JE, England
基金
英国工程与自然科学研究理事会;
关键词
ELECTROHYDRODYNAMIC ATOMIZATION; SUSPENSION POLYMERIZATION; PHASE-SEPARATION; LATEX-PARTICLES; SINGLE-HOLE; SURFACE; SHELL; FABRICATION; SPHERES; MICROENCAPSULATION;
D O I
10.1021/la903592s
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The feasibility of producing a hollow microsphere with a single hole in its shell by coaxial electrohydrodynamic atomization (CEHDA) is demonstrated. polymethylsilsesquioxane (PMSQ) was used as a model shell material encapsulating a core of a volatile liquid, perfluorohexane (PFH), which was subsequently evaporated to produce the hollow microspheres. The diameters of the microspheres and of the single surface pore were controlled by varying the flow rate of the components, the concentration of the PMSQ solution, and the applied voltage in the CEHDA process. The particles were characterized by scanning electron microscopy, and the ranges obtained were 275-860 rim for the microsphere diameter and 35-135 nm for the pore size. The process overcomes several of the key problems associated with existing methods of monoporous microsphere formation including removing the need for elevated temperatures, multiple processing steps, and the use of surfactants and other additives.
引用
收藏
页码:5115 / 5121
页数:7
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