Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 350, Issue 1, Pages 368-372Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.06.016
Keywords
Gold nanoparticles; Emulsions-directed assembly; Porous nanospheres
Categories
Funding
- Royal Society
- Engineering and Physical Sciences Research Council (EPSRC) [EP/C511794/1, GR/N39999, GR/R15597, EP/F016883/1]
- National Commission on Nanoscience and Technology (NCNST), Ministry of Science and Technology (MoST), Govt. of Pakistan
- LUMS School of Science & Engineering (SSE), Lahore, Pakistan
- Engineering and Physical Sciences Research Council [EP/F016883/1, EP/C511794/1] Funding Source: researchfish
- EPSRC [EP/F016883/1] Funding Source: UKRI
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Aggregation of gold nanoparticles into soluble spherical assemblies using bi-functional ligands i.e., dithiols has recently been demonstrated but with limited control over the size of such assemblies. Herein, we report a new approach to further control the size of water dispersible spherical assemblies by confining gold nanoparticles in tiny oil droplets in water (oil-in-water emulsions) followed by their cross-linking with alkanedithiols. By controlling the size of the oil droplets and the concentration of nanoparticles, the size of spherical aggregates can be controlled from 20 to 400 nm. Cryo-TEM micrographs confirm the formation of covalently-linked soluble spherical nanoparticle assemblies within the oil emulsions in water. Such size-controlled nanoparticle assemblies may have several potential applications including those in gas sensors, controlled delivery, and optical coatings. (C) 2010 Elsevier Inc. All rights reserved.
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