Abstract
Mesoporous silica vesicles (MSVs) were prepared using a binary mixed-template system. Cetylpyridinium bromide (CTPB) and cationic fluorocarbon surfactant (FC-4) were employed as templates. The mixed-template synthesis led to MSV materials with two different morphologies. The mesopore expansion and template removal were simultaneously achieved by Ca ion-etching. The Ca ion-etching process not only removed the templates but also generated ultra-large pores through partial collapse of several mesopores. Calcined MSV with smaller mesopores showed better adsorption of small lysozyme than did the etched MSV (Ca-MSV). Contrarily, Ca-MSV showed slightly enhanced adsorption abilities for ovalbumin and hemoglobin than did calcined MSV. Ca-MSV was especially good at sequestering large protein, such as bovine serum albumin.
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