Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 384, Issue -, Pages 22-28Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.06.043
Keywords
Hollow silica particle; Self-template; Wet etching; Biomolecule immobilizing
Categories
Funding
- National Basic Research Program of China [2012CB933802]
- National Science Foundation of China [91123031, 30830108, 20804017]
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We report here the fabrication of hollow silica particles with mesopores larger than 10 nm on their wall via a facile two-step etching method. Different from the conventional template method, the new method uses the silica particles as starting materials, which were synthesized using the well-known Stober method. In the hollow silica preparation, first, we gently etch the silica particles with a NaOH solution without using template molecules to make them porous. Then, we coat the porous silica particles with poly-dimethyldiallylammonium chloride (PDDA) and treat the PDDA-coated porous silica with an ammonia solution to form the hollow silica nanospheres. In this study, we found that the NaOH dosage and ammonia concentration have significant impact on the morphology of the final products. Adsorption was also studied and results show that the hollow nanospheres can effectively uptake protein-based biomolecules (hemoglobin). (C) 2012 Elsevier Inc. All rights reserved.
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