Linked Life Data

16852124

Source:http://linkedlifedata.com/resource/pubmed/id/16852124

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
19
pubmed:dateCreated
2006-7-20
pubmed:abstractText
By nanosecond, 532-nm laser irradiation typically at approximately 1 J/(cm2 pulse), water-suspended thin gold flakes, 0.1-0.2-microm thick but more than 10-microm across, were efficiently fragmented in a unique two-step mode, as evidenced by the in situ extinction spectra taken as a function of the laser irradiation time. The initial main photoproducts were spherical gold particles in the submicrometer regime. Their ensuing laser fragmentation in oxygen-free water environment generated stable, negatively charged, fine nanoparticles less than 10 nm in diameter, characterized by a considerably weak and blue-shifted plasmon band. The Mie theory can reproduce these distinct spectral features of the fine nanoparticles as well as the scattering-dominated extinction spectra of the submicroparticles. The submicroparticle to nanoparticle conversion seemed most likely to be a single-pulse event, not leaving any larger intermediate nanoparticles in the suspension. Oxygen, as an effective electron acceptor, strongly affected the stability of the negatively charged nanoparticles, promoting their quasi-reversible or irreversible agglomeration. From the estimated balance between the absorbed laser energy and the energies for the relevant particles to produce a high-temperature molten state, possible fragmentation mechanisms are discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1520-6106
pubmed:author
pubmed:issnType
Print
pubmed:day
19
pubmed:volume
109
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
9379-88
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Laser fragmentation of water-suspended gold flakes via spherical submicroparticles to fine nanoparticles.
pubmed:affiliation
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan. Kawasaki@ap6.kuic.kyoto-u.ac.jp
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't