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Dense aqueous colloidal gold nanoparticles prepared from highly concentrated precursor solution
- Source :
-
Journal of Colloid & Interface Science . Oct2011, Vol. 362 Issue 2, p325-329. 5p. - Publication Year :
- 2011
-
Abstract
- Abstract: Gold nanoparticles were fabricated by reduction of highly concentrated Au(III) ions (200mM) with casein proteins from milk. The gold nanoparticles were converted to nanoparticle-powders after washing and subsequent vacuum drying without aggregation. The nanoparticle-powders completely re-dispersed in aqueous solution, and stable colloidal gold nanoparticles were obtained. UV–vis extinction spectra and dynamic light scattering (DLS) measurements revealed that large assemblies (size, ca. 3μm) and subaggregates (size, <0.5μm) composed of gold nanoparticle–casein protein chain–Au(III) ion were dynamically formed and disintegrated over the course of the growth of the gold nanoparticles. Fourier transform infrared (FT-IR) spectra indicated conformational changes of casein proteins induced by the interaction of casein protein–Au(III) ion and -gold nanoparticle. Finally, rapid, one-pot, and highly concentrated synthetic procedures of gold and silver nanoparticle powders protected by casein (mean diameters below 10nm) were successfully developed using 3-amino-1-propanol aqueous solutions as reaction media. Dense colloidal gold (40gL−1) and silver (22gL−1) nanoparticle aqueous solutions were obtained by re-dispersing the metal nanoparticle powders. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 362
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 64477498
- Full Text :
- https://doi.org/10.1016/j.jcis.2011.07.010