Local Structure of ZnO Micro Flowers and Nanoparticles Obtained by Micro-Segmented Flow Synthesis.
Summary of "Local Structure of ZnO Micro Flowers and Nanoparticles Obtained by Micro-Segmented Flow Synthesis."
The micro-segmented flow technique was applied for continuous synthesis of ZnO micro- and nanoparticles with short residence times of 9.4 s and 21.4 s, respectively. The obtained particles were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Small angle X-ray scattering (SAXS) and photoluminescence spectroscopy were used to determine the size and optical properties of ZnO nanoparticles. In addition, extended X-ray absorption fine structure (EXAFS) spectroscopy was employed to investigate local structural properties. The EXAFS measurements reveal a larger degree of structural disorder in the nanoparticles than the microparticles. These structural changes should be taken into consideration while evaluating the size-dependent visible emission of ZnO nanoparticles.
Department of Physical Chemistry and Micro Reaction Technology, Ilmenau University of Technology, Weimarer Strasse 32D-98693 Ilmenau (Germany). email@example.com.
This article was published in the following journal.
Name: Chemphyschem : a European journal of chemical physics and physical chemistry
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22407573
- DOI: http://dx.doi.org/10.1002/cphc.201100960
Medical and Biotech [MESH] Definitions
Localized destruction of the tooth surface initiated by decalcification of the enamel followed by enzymatic lysis of organic structures and leading to cavity formation. If left unchecked, the cavity may penetrate the enamel and dentin and reach the pulp. The three most prominent theories used to explain the etiology of the disease are that acids produced by bacteria lead to decalcification; that micro-organisms destroy the enamel protein; or that keratolytic micro-organisms produce chelates that lead to decalcification.
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