Synthesis and growth kinetics of spindly CuO nanocrystals via pulsed wire explosion in liquid medium

Krishnan, Shutesh; Haseeb, A.S.M.A.; Johan, Mohd Rafie

doi:10.1007/s11051-012-1410-7

Cited by 24 publications

(12 citation statements)

References 32 publications

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“…The lattice fringe of the CuO(111) fresh sample is regular, with a distance of 0.234 nm, and that of the spent catalyst is 0.206 nm, in agreement with existing literature 13. 14…”

Section: Methodsmentioning

confidence: 99%

Biomass Oxidation: Formyl CH Bond Activation by the Surface Lattice Oxygen of Regenerative CuO Nanoleaves

et al. 2015

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An integrated experimental and computational investigation reveals that surface lattice oxygen of copper oxide (CuO) nanoleaves activates the formyl CH bond in glucose and incorporates itself into the glucose molecule to oxidize it to gluconic acid. The reduced CuO catalyst regains its structure, morphology, and activity upon reoxidation. The activity of lattice oxygen is shown to be superior to that of the chemisorbed oxygen on the metal surface and the hydrogen abstraction ability of the catalyst is correlated with the adsorption energy. Based on the present investigation, it is suggested that surface lattice oxygen is critical for the oxidation of glucose to gluconic acid, without further breaking down the glucose molecule into smaller fragments, because of CC cleavage. Using CuO nanoleaves as catalyst, an excellent yield of gluconic acid is also obtained for the direct oxidation of cellobiose and polymeric cellulose, as biomass substrates.

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“…The lattice fringe of the CuO(111) fresh sample is regular, with a distance of 0.234 nm, and that of the spent catalyst is 0.206 nm, in agreement with existing literature 13. 14…”

Section: Methodsmentioning

confidence: 99%

Biomass Oxidation: Formyl CH Bond Activation by the Surface Lattice Oxygen of Regenerative CuO Nanoleaves

et al. 2015

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“…It has to be mentioned that CuO NPs present different morphology when they are prepared upon oxidation of copper nanoparticles. In our previous study, Cu NPs coated with PEG 8000 were oxidized over time to leaf-like structured CuO NPs, 9 while the same shape has been reported also for CuO nanocrystals prepared either by oxidizing copper NPs in hexadecyl trimethyl ammonium bromide solution (CTAB)30 or through pulsed copper wire explosion system in distilled water 31.…”

mentioning

confidence: 55%

Synthesis and biological evaluation of PEGylated CuO nanoparticles

Giannousi

Hatzivassiliou

Mourdikoudis

et al. 2016

Journal of Inorganic Biochemistry

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There is a growing field of research into the physicochemical properties of metal oxide nanoparticles (NPs) and their potential use against tumor formation, development and progression. Coated NPs with biocompatible surfactants can be incorporated into the natural metabolic pathway of the body and specifically favor delivery to the targeted cancerous cells versus normal cells. Polyethylene glycol (PEG) is an FDA approved, biocompatible synthetic polymer and PEGylated NPs are regarded as "stealth" nanoparticles, which are not recognized by the immune system. Herein, PEGylated cupric oxide nanoparticles (CuO NPs) with either PEG 1000 or PEG 8000 were hydrothermally prepared upon properly adjusting the reaction conditions. Depending on the reaction time CuO NPs in the range of core sizes 11-20nm were formed, while hydrodynamic sizes substantially varied (330-1120nm) with improved colloidal stability in PBS. The anticancer activity of the NPs was evaluated on human cervical carcinoma HeLa cells by using human immortalized embryonic kidney 293 FT cells as a control. Viability assays (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, MTT) revealed that CuO NPs could selectively reduce viability of tumor cells (IC values 11.91-25.78μg/mL). Reactive oxygen species (ROS) production, cell membrane damage and apoptotic DNA laddering were also evident by nitroblue tetrazolium (NBT) reduction, lactate dehydrogenase (LDH) release assays and DNA electrophoresis, respectively. CuO NPs strongly inhibited lipoxygenase (LOX) enzymatic activity with IC values 4-5.9μg/mL, highlighting in that manner their anti-inflammatory activity.

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“…On the other hand, nanoparticle is nucleated and grown via super-saturation during cooling. In-flight particles collide each other during flight and accordingly, agglomerations between nanoparticles and between nanoparticle and micro-powder occurs [16]. As a result, nanoparticle attached micro-powder can be obtained.…”

Section: Resultsmentioning

confidence: 99%

Double Step Sintering Behavior Of 316L Nanoparticle Dispersed Micro-Sphere Powder

Jeon¹,

Sohn²,

Lee³

et al. 2015

Archives of Metallurgy and Materials

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316L stainless steel is a well-established engineering material and lots of components are fabricated by either ingot metallurgy or powder metallurgy. From the viewpoints of material properties and process versatility, powder metallurgy has been widely applied in industries. Generally, stainless steel powders are prepared by atomization processes and powder characteristics, compaction ability, and sinterability are quite different according to the powder preparation process. In the present study, a nanoparticle dispersed micro-sphere powder is synthesized by pulse wire explosion of 316L stainless steel wire in order to facilitate compaction ability and sintering ability. Nanoparticles which are deposited on the surface of micro-powder are advantageous for a rigid die compaction while spherical micro-powder is not to be compacted. Additionally, double step sintering behavior is observed for the powder in the dilatometry of cylindrical compact body. Earlier shrinkage peak comes from the sintering of nanoparticle and later one results from the micro-powder sintering. Microstructure as well as phase composition of the sintered body is investigated.

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Synthesis and growth kinetics of spindly CuO nanocrystals via pulsed wire explosion in liquid medium

Cited by 24 publications

References 32 publications

Biomass Oxidation: Formyl CH Bond Activation by the Surface Lattice Oxygen of Regenerative CuO Nanoleaves

Biomass Oxidation: Formyl CH Bond Activation by the Surface Lattice Oxygen of Regenerative CuO Nanoleaves

Synthesis and biological evaluation of PEGylated CuO nanoparticles

Double Step Sintering Behavior Of 316L Nanoparticle Dispersed Micro-Sphere Powder

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