Medium controlled aggregative growth as a key step in mesoporous silica nanoparticle formation

Semeykina, Viktoriya; Zharov, Ilya

doi:10.1016/j.jcis.2022.01.166

Title: Medium controlled aggregative growth as a key step in mesoporous silica nanoparticle formation

Journal Article · 31 January 2022 · Journal of Colloid and Interface Science

DOI: https://doi.org/10.1016/j.jcis.2022.01.166 · OSTI ID:1864182

Semeykina, Viktoriya ^[1]; Zharov, Ilya ^[2]

Univ. of Utah, Salt Lake City, UT (United States); University of Utah
Univ. of Utah, Salt Lake City, UT (United States)

Near monodisperse mesoporous silica nanoparticles (MSN) represent a promising and rapidly developing type of mesoporous silica materials; however, the vast data on their synthesis remains unorganized and ill-understood. We systematically studied the formation of MSN under basic and neutral conditions using various temperatures, CTAB concentrations, hydrolyzing agents (triethanolamine, ammonia, phosphate buffers), and media with different colloidal stabilization properties (with ethanol as a cosolvent and monovalent salts). In the typical conditions for the preparation of stable MSN colloids, the particle size was controlled by colloidal stabilization by the medium (solvent type, ionic strength, and surfactant concentration) in agreement with the “aggregative growth” mechanism, rather than by solely the hydrolysis and condensation rates conventionally used for data interpretation in the classical nucleation theory. Medium properties (pH, ion types and concentration, polarity) also defined the efficiency of silica-surfactant cooperative self-assembly, which directly affected the porosity, mesopore size and pore wall thickness. Interestingly, this traditional silica-surfactant route showed a limited effect on the particle size, emphasizing the dominating role of colloidal stabilization in the studied reaction conditions. In situ pH measurements showed that every reaction medium has unique pH evolution profiles depending on the buffer capacity, hydrolysis and condensation rates. Reaction systems that fail to maintain the working pH can lead to non-porous products or undesired particle morphology and size distribution. The established particle formation mechanism allowed us to formulate comprehensive guidelines for preparing relatively concentrated colloids of near monodisperse (PDI 5–15%) mesoporous 30–700 nm silica spheres with variable porosity and mesopore size. Here, these findings will be particularly useful in designing new mesoporous silica-containing materials for biomedical applications.

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Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019285

OSTI ID:: 1864182

Journal Information:: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Vol. 615; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Aggregation
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MSN
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Nucleation

Title: Medium controlled aggregative growth as a key step in mesoporous silica nanoparticle formation

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