Linked Life Data

21229758

Source:http://linkedlifedata.com/resource/pubmed/id/21229758

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
2011-1-13
pubmed:abstractText
The aggregation and deaggregation behaviors have profound impacts on the fate of nanoparticles in the environment. In this work, the aggregation and deaggregation kinetics of hematite nanoparticles at different pHs were examined using a Zetasizer. In the pH range of 7.0-8.7, aggregation occurred quickly(e. g., the average size increased from 31 nm to 1 400 nm with 400 s at pH = 8.2), whereas at pH below 6.2, no aggregation was observed. Deggregation of hematite nanoparticles without aging was slower than aggregation and not completely reversible, demonstrating hysteresis. Aging caused more hematite nanoparticles to aggregate irreversibly. At point of zero charge (pH = 8.2), no deaggregation of aged particles was observed. At pH = 7.0 and 8.9, the average sizes of aged samples (about 500 nm) after deaggregation was greater than those of the samples without aging (about 250 nm). The hyteresis of the aggregation-deaggregation process poses significant difficulty to predict the fate and ecological effects of nanoparticles in the environment.
pubmed:language
chi
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0250-3301
pubmed:author
pubmed:issnType
Print
pubmed:volume
31
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2439-44
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
[Aggregation and deaggregation behaviors of hematite nanoparticles at different pHs].
pubmed:affiliation
Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. janeshenxin@gmail.com
pubmed:publicationType
Journal Article, English Abstract, Research Support, Non-U.S. Gov't