Driving Forces for Layer-by-Layer Self-Assembly of Films of SiO2 ... [PDF]

Dec 20, 2003 - Heme protein hemoglobin (Hb) or myoglobin (Mb) and silica nanoparticles in a variety of charge states wer

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Table of Contents

Driving Forces for Layer-by-Layer Self-Assembly of Films of SiO2 Nanoparticles and Heme Proteins Pingli He, † Naifei Hu,*† andJames F. Rusling‡ Department of Chemistry, Beijing Normal University, Beijing, 100875, People's Republic of China, Department of Chemistry, University of Connecticut, U-60, Storrs, Connecticut 06269-3060, and Department of Pharmacology, University of Connecticut Health Center, Farmington, Connecticut 06032

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Langmuir, 2004, 20 (3), pp 722–729 DOI: 10.1021/la035006r Publication Date (Web): December 20, 2003 Copyright © 2004 American Chemical Society

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Heme protein hemoglobin (Hb) or myoglobin (Mb) and silica nanoparticles in a variety of charge states were assembled layer-by-layer into films on solid surfaces to investigate the driving forces

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for film assembly. Cyclic voltammetry (CV), quartz crystal microbalance (QCM), X-ray

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photoelectron spectroscopy (XPS), and UV−vis and reflectance absorption infrared (RAIR)

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spectroscopy were used to characterize the different {SiO2/protein}n films. Even when the proteins and silica were both negatively charged, stable layer-by-layer {SiO2/protein}n films were successfully fabricated, although amounts of protein were smaller than when nanoparticles and proteins had opposite charges. Results suggest the importance of localized Coulombic



He, Pingli

attractions between the negative nanoparticle surface and positively charged amino acid residues on the Mb or Hb surfaces in the assembly and for the stability of {SiO2/protein}n films.

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Received 9 June 2003 Published online 20 December 2003 Published in print 1 February 2004

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