Characterization of Nanophase Materials

Wang, Zhong Lin

doi:10.1002/1521-4117(200110)18:3<142::aid-ppsc142>3.0.co;2-n

Cited by 87 publications

(63 citation statements)

References 53 publications

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“…[83,84] TEM is a high-spatial-resolution structural and chemical characterization tool. [85] A modern HRTEM has the capability to directly image atoms in crystalline specimens at resolutions close to 1 Å, smaller than the interatomic distance. This type of analysis is extremely important for characterizing materials at a length scale from atoms to hundreds of nanometers.…”

Section: Structure and Characterizationmentioning

confidence: 99%

Plasmonic Optical Properties and Applications of Metal Nanostructures

2008

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In this review article, we provide an overview of recent research activities in the study of plasmonic optical properties of metal nanostructures with emphasis on understanding the relation between surface plasmon absorption and structure. Both experimental results and theoretical calculations have indicated that the plasmonic absorption strongly depends on the detailed structure of the nanomaterials. Examples discussed include spherical nanoparticles, nanorods, nanowires, hollow nanospheres, aggregates, and nanocages. Plasmon-phonon coupling measured from dynamic studies as a function of particle size, shape, and aggregation state is also reviewed. The fascinating optical properties of metal nanostructures find important applications in a number of technological areas including surface plasmon resonance, surface-enhanced Raman scattering, and photothermal imaging and therapy. Their novel optical properties and emerging applications are illustrated using specific examples from recent literature. The case of hollow nanosphere structures is highlighted to illustrate their unique features and advantages for some of these applications.

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Section: Structure and Characterizationmentioning

confidence: 99%

Plasmonic Optical Properties and Applications of Metal Nanostructures

2008

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“…uJê~ó=aáÑÑê~Åíáçå= The X-ray diffraction pattern of silver nanoparticle was recorded according to the method [11]. X-ray diffraction pattern was recorded in the scanning mode on an X'pert PRO PAN analytical instrument operated at 40 kV and a current of 30 mA with Cu K∝ radiation (λ = 1.5406 Å).…”

Section: Rsjsfp=pééåíêçëåçéó=mentioning

confidence: 99%

Fabrication and characterization of silver nanoparticle and its potential antibacterial activity

Prema¹,

Raju²

2009

Biotechnol Bioproc E

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In the present research silver nanoparticle was fabricated by chemical reduction of silver salt (Silver nitrate, AgNO 3 ) solution. Sodium citrate was used as a reducer. The formation of silver nanoparticle was observed visually by color change (greenish yellow). The surface plasmon resonance peak in absorption spectra of silver nanoparticle showed an absorption maximum at 420 nm in UV-VIS spectrometry. The X-ray diffraction pattern showed the presence of sharp reflections at 111, 200, 220, and 311. This would indicate the presence of silver nanoparticle. The scanning electron micrograph revealed that the average size of silver nanoparticle was 21.22 ± 5.17 nm. Silver nanoparticle exhibited better antimicrobial activity against pí~éÜóäçÅçÅÅìë=~ìêÉìë than the other bacterial pathogens. The correlation coefficient between silver nanoparticles and selected bacterial pathogens revealed that there is a strong negative correlation with bëÅÜÉêáÅÜá~=ÅçäáI= pK=~ìêÉìë and häÉÄëáÉää~=éåÉìãçåá~ (r = −0.975, −0.993, and −0.998, respectively). © KSBB hÉóïçêÇëW=ëáäîÉê=å~åçé~êíáÅäÉI=rsI=uoaI=pbjI=~åíáÄ~ÅíÉêá~ä=~Åíáîáíó= = = = =

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“…Using a JEOL-JEM-2100F electron microscope (JEOL Ltd, Tokyo, Japan) with an electron beam accelerated at 200 kV, and placing the sample on a gold grid with a holey carbon support film, micrographs were obtained from significant areas of the sample using the bright field technique, where crystalline parts in Bragg orientation appear dark and the amorphous or not Bragg-oriented parts appear bright. 23 Some electron diffraction patterns were also obtained from the sample using the selected-area diffraction technique, which projects a parallel incident electron beam, accelerated at 200 kV, over the sample and photographs the diffracted beam pattern. The pattern is a scaled representation of a section of the reciprocal lattice; each spot represents a plane in the crystal that has been diffracted.…”

Section: Transmission Electronic Microscopymentioning

confidence: 99%

Catalytic nanomedicine technology: copper complexes loaded on titania nanomaterials as cytotoxic agents of cancer cell

López¹,

Ortiz-Islas²,

Guevara³

et al. 2013

IJN

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Abstract:The anticancer properties of pure copper (II) acetate and copper (II) acetylacetonate, alone and loaded on functionalized sol-gel titania (TiO 2 ), were determined in four different cancer cell lines (C6, RG2, B16, and U373), using increasing concentrations of these compounds. The copper complexes were loaded onto the TiO 2 network during its preparation by the solgel process. Once copper-TiO 2 materials were obtained, these were characterized by several physical-chemical techniques. An in vitro copper complex-release test was developed in an aqueous medium at room temperature and monitored by ultraviolet spectroscopy. The toxic effect of the copper complexes, alone and loaded on TiO 2 , was determined using a cell viability 3(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) assay, when cancer cells were treated with increasing concentrations (15.75-1000 mg/mL) of these. Characterization studies revealed that the addition of copper complexes to the TiO 2 sol-gel network during its preparation, did not generate changes in the molecular structure of the complexes. The surface area, pore volume, and pore diameter were affected by the copper complex additions and by the crystalline phases obtained. The kinetic profiles of both copper complexes released indicated two different stages of release: The first one was governed by first-order kinetics and the second was governed by zero-order kinetics. The cell viability assay revealed a cytotoxic effect of copper complexes, copper-TiO 2 , and cisplatin in a dose-dependent response for all the cell lines; however, the copper complexes exhibited a better cytotoxic effect than the cisplatin compound. TiO 2 alone presented a minor cytotoxicity for C6 and B16 cells; however, it did not cause any toxic effect on the RG2 and U373 cells, which indicates its high biocompatibility with these cells.

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Characterization of Nanophase Materials

Cited by 87 publications

References 53 publications

Plasmonic Optical Properties and Applications of Metal Nanostructures

Plasmonic Optical Properties and Applications of Metal Nanostructures

Fabrication and characterization of silver nanoparticle and its potential antibacterial activity

Catalytic nanomedicine technology: copper complexes loaded on titania nanomaterials as cytotoxic agents of cancer cell

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