Size control of dendrimer-templated silica

Marc Knecht, Sarah L. Sewell, David W. Wright

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

One of the most significant challenges facing the biomimetic synthesis of materials is achieving the requisite level of dimensional and spatial control. Typical reaction conditions for biomimetic silica synthesis allow for continued growth and ripening leading to the formation of larger nanospheres on the order of 200-600 nm in diameter. Herein, we have used polyamidoamine and polypropylenimine dendrimers as templates to expand the reaction conditions of biogenic silica production to produce a more robust synthesis leading to size-selective precipitation of silica nanospheres. Through the use of defined concentrations of phosphate buffer and main group metal chloride salts, we have shown that the biomimetic silica growth process is controlled by cationic neutralization of the anionic silica nanosphere surface. Neutralization minimizes electrostatic repulsions, allowing for agglomerization and continued growth of nanospheres. By controlling these concentrations, we can selectively produce silica nanospheres of desired dimensions between 30 and 300 nm without adversely affecting the template's activity.

Original languageEnglish
Pages (from-to)2058-2061
Number of pages4
JournalLangmuir
Volume21
Issue number5
DOIs
StatePublished - Mar 1 2005
Externally publishedYes

Fingerprint

Dendrimers
dendrimers
Nanospheres
Silicon Dioxide
Silica
silicon dioxide
biomimetics
Biomimetics
templates
synthesis
Chlorides
Electrostatics
phosphates
Buffers
Phosphates
Salts
buffers
Metals
chlorides
electrostatics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Knecht, M., Sewell, S. L., & Wright, D. W. (2005). Size control of dendrimer-templated silica. Langmuir, 21(5), 2058-2061. https://doi.org/10.1021/la047800y

Size control of dendrimer-templated silica. / Knecht, Marc; Sewell, Sarah L.; Wright, David W.

In: Langmuir, Vol. 21, No. 5, 01.03.2005, p. 2058-2061.

Research output: Contribution to journalArticle

Knecht, M, Sewell, SL & Wright, DW 2005, 'Size control of dendrimer-templated silica', Langmuir, vol. 21, no. 5, pp. 2058-2061. https://doi.org/10.1021/la047800y
Knecht, Marc ; Sewell, Sarah L. ; Wright, David W. / Size control of dendrimer-templated silica. In: Langmuir. 2005 ; Vol. 21, No. 5. pp. 2058-2061.
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