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Preparation and characterization of block copolymers containing cinnamate groups with end-capped ZnO

100%
Jitaru F., Buruiana T., Hitruc G., Buruiana E.
Open Chemistry
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2013
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vol. 11
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issue 9
1492-1504
EN
Abstract ZnO-poly(2-cinnamoyloxyethyl methacrylate) and ZnO-poly(2-cinnamoyloxyethyl methacrylate)-b-poly[(poly(ethylene glycol) methyl ether methacrylate] have been prepared by atom transfer polymerization initiated through a 2-bromoisobutyryl or bromoethyl group linked onto the ZnO nanoparticle surface (ZnO-BIBB, ZnO-BEI). The structure and morphology of the hybrids were characterized using Fourier transform infrared, proton nuclear magnetic resonance, fluorescence and UV spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron (TEM) and atomic force microscopy. The existence of nanoparticles with diameters varying between 40 and 100 nm was evident in the TEM images of the pure ZnO, ZnO-PCEMA-Br-2 and the diblock copolymer. Under an excitation of 340 nm, these materials exhibit a broad emission band at around 390 nm, which was associated with the presence of ZnO in the organic matrix. Graphical abstract [...]
2
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Optical Properties of ZnO Nanoparticles Synthesised from a Polysaccharide and ZnCl₂

100%
Bindu P., Thomas S.
Acta Physica Polonica A
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2017
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vol. 131
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issue 6
1474-1478
EN
In this article we study the optical properties of ZnO nanoparticles. This paper describes cost effective, high yield, and a facile synthetic method for the synthesis of ZnO nanoparticles from precursors viz. linear polysaccharide, chitosan, and ZnCl₂ by a precipitation method. The synthesized ZnO nanoparticles were characterized by surface area, pore size, and UV-visible measurements. The optical band gap and the Urbach energy were also calculated and the optical band gap energy of the synthesized ZnO nanoparticles was found to be 3.26 eV and the nature of the optical transition has been identified as direct allowed.
3
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Cooling of high heat flux flat surface with nanofluid assisted convective loop: experimental assessment

89%
Arya A., Shahmiry S., Nikkhah V., Sarafraz M. M., Arya A., Shahmiry S., Nikkhah V., Sarafraz M. M.
Archive of Mechanical Engineering
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2017
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vol. 64
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issue 4
4
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Water Glass Modification and its Impact on the Mechanical Properties of Moulding Sands

75%
Kmita A., Hutera B.
Archives of Foundry Engineering
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2013
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issue 2
5

Methods of ZnO nanoparticles synthesis

75%
ŻELECHOWSKA K.
BioTechnologia
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2014
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vol. 95
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issue 2
150-159
EN
Zinc oxide nanostructures are interesting nanomaterials with a wide range of applications. Since the physical and chemical properties of ZnO nanoparticles are influenced both by their shape and size, a control of morphology of ZnO structures is needed for their commercial usage. Different chemical, physical, and biological methods used to produce ZnO nanostructures can be found in the literature. The production of ZnO nanoparticles using so-called green methods, using, for example, plant extracts or living organisms, is being investigated as these methods are environmentally friendly and of low-cost. This review also discusses the trends in the biological synthesis of semiconducting nanoparticles.
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