Linked Life Data

19049198

Source:http://linkedlifedata.com/resource/pubmed/id/19049198

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2008-12-3
pubmed:abstractText
The extra reactivity of nano materials is attributed to the excess surface energy stored in the sample. The excess enthalpy of SnO2 nano-particles were measured as a function of particle size using a calvet calorimeter. SnO2 with particle size 11, 27, 47 nm and bulk samples (1 microm) were dropped from room temperature to 987, 936 and 885 K and their H(T)-H298 values were determined. The excess enthalpies for SnO2 samples with particle sizes 11, 27 and 47 nm compared to the bulk sample calculated from the difference between H(T)-H298 values of the nano and the bulk samples were found to be 15.06, 3.05, 2.21 kJ x mol(-1) respectively. Luminescence experiments reveal that the surface trap electron density decreases with increase of particle size. The excess enthalpy is related to the surface trap intensity.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Aug
pubmed:issn
1533-4880
pubmed:author
pubmed:issnType
Print
pubmed:volume
8
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4176-80
pubmed:year
2008
pubmed:articleTitle
Excess enthalpy and luminescence studies of SnO2 nanoparticles.
pubmed:affiliation
Chemistry Division, Bhabha Atomic Research Centre, Mumbai 40085, India.
pubmed:publicationType
Journal Article