NDLI: Size control of dendrimer-templated silica.

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Size control of dendrimer-templated silica.

Content Provider	Semantic Scholar
Author	Knecht, Marc R. Sewell, Sarah L. Wright, David D.
Copyright Year	2005
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.
Starting Page	P90
Ending Page	P90
Page Count	1
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.sitemason.com/files/gBVJFC/Knecht%202005%20Size%20Control%20of%20Dendrimertemplated%20silica.pdf
PubMed reference number	15723511v1
Volume Number	21
Issue Number	5
Journal	Langmuir : the ACS journal of surfaces and colloids
Language	English
Access Restriction	Open
Subject Keyword	Biomimetics Chloride Ion Clinical Use Template Dendrimers Diameter (qualifier value) Dimensions Large Nanospheres Neutralization (Chemistry) PHOSPHATE BUFFERS Poly(amidoamine) Salts Silicic Acid Silicon Dioxide inorganic phosphate poly(propyleneimine) ripening
Content Type	Text
Resource Type	Article

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