Aquatic Fern (AzollaSp.) Assisted Synthesis of Gold Nanoparticles

2016 ◽  
Vol 15 (01n02) ◽  
pp. 1650008 ◽  
Author(s):  
Anal K. Jha ◽  
K. Prasad
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Au Nanoparticles ◽  
X Ray ◽  
Aquatic Fern ◽  
Transmission Electron ◽  
Anthraquinone Glycosides ◽  
Uv Visible

Aquatic pteridophyte (Azolla sp.) was taken to assess its potential to synthesize the metal (Au) nanoparticles. The synthesized particles were characterized using X-ray, UV-visible, scanning and transmission electron microscopy analyses. Nanoparticles almost spherical in shape having the sizes of 5–17[Formula: see text]nm are found. UV-visible study revealed the surface plasmon resonance at 538[Formula: see text]nm. Responsible phytochemicals for the transformation were principally phenolics, tannins, anthraquinone glycosides and sugars present abundantly in the plant thereby bestowing it adaptive prodigality. Also, the use of Azolla sp. for the synthesis of gold nanoparticles offers the benefit of eco-friendliness.

Biosynthesis of Gold Nanoparticles from Nauclea latifolia Leaves

2015 ◽  
Vol 1132 ◽  
pp. 36-50 ◽  
Author(s):  
S.O. Dozie-Nwachukwu ◽  
G. Etuk-Udo ◽  
J.D. Obayemi ◽  
Nicolas Anuku ◽  
O.S. Odusanya ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Light Scattering ◽  
Cancer Detection ◽  
X Ray ◽  
Transmission Electron ◽  
Potential Applications ◽  
Uv Visible ◽  
Nauclea Latifolia

The biosynthesis of gold nanoparticles fromNauclea latifolialeaf/plant extract is presented in this paper. The synthesis is shown to produce gold nanoparticles from hydrogen Tetra-chloro auric acid (HAuCl4) in less than 1 minute. The resulting gold nanoparticles are characterized using UV/Visible spectrophotometry (UV-Vis), Energy Dispersive X-ray Spectroscopy (EDX), Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM). The implications of the results are discussed for potential applications of biosynthesized gold nanoparticles in cancer detection and treatment.

Synthesis and Characterizations of Nanocubes, Monodispersed Nanocrystals and Nanospheres of Au

2007 ◽  
Vol 353-358 ◽  
pp. 2163-2166
Author(s):  
Ming Yang ◽  
Guo Qing Zhou ◽  
Jiang Guo Zhao ◽  
Zhan Jun Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Scherrer Formula ◽  
Visible Absorption Spectroscopy

Nanocubes, monodispersed nanocrystals and nanospheres of Au have been prepared by a simple reaction between HAuCl4·4H2O, NaOH and NH2OH·HCl in the presence of gelatin. The role of gelatin and the affection of pH in producing the nanoparticles of Au were discussed. The products were characterized by X-ray powder diffraction, transmission electron microscopy, and UV-visible absorption spectroscopy. The sizes of the monodispersed nanocrystals of Au were estimated by Debye-Scherrer formula according to XRD spectrum.

scholarly journals Synthesis and application of pigments based on lanthanide orthoferrites

2020 ◽  
Vol 14 (2) ◽  
pp. 161-167
Author(s):  
Patrícia Pimentel ◽  
Jairo Dutra ◽  
Maria Câmara ◽  
Gerbeson Dantas ◽  
Osmar Bagnato ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Perovskite Phase ◽  
Visible Region ◽  
Ceramic Pigments ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Cie Lab

In this work, we synthesized oxides with perovskite LnFeO3 type structure (where Ln = La, Pr and Nd), aiming their use as ceramic pigments. The as-synthesized powders, prepared by gelatin method, were thermally treated at 600 and 800 ?C to obtain the perovskite phase. The characterization was performed using X-ray diffraction technique, followed by Rietveld refinement, scanning and transmission electron microscopy, spectroscopy in the UV-Visible region and CIE Lab colorimetry. The calcined powders were also used for fabrication of ceramic pieces to evaluate the colour when 2 wt.% of the powders was added into a transparent glaze. The pigments presented shades ranging from pale brown for the powdered samples to yellowish when applied in the glazes.

Phase Sensitive Behavior and Optical Properties of Cu0.45Mn0.55O2 Nanoparticles

2012 ◽  
Vol 548 ◽  
pp. 110-114 ◽  
Author(s):  
Qurat Ul Ain Javed ◽  
Feng Ping Wang ◽  
M. Yasir Rafique ◽  
M. Zubair Iqbal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Visible Spectrum ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Detailed Characteristic ◽  
Direct Band ◽  
Phase Sensitive ◽  
Uv Visible

In this work, we have reported a facile approach to fabricate the new Cu0.45Mn0.55O2 nanoparticles with novel properties. The detailed characteristic of the nanoparticles have been performed by X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-visible spectroscopy. HRTEM and SAED measurements point out that the nanoparticles are phase sensitive during exposure to electron beam irradiation and undergo a reversible transition from single crystal to polycrystalline. UV-visible spectrum indicates the direct band gap of 1.4eV as well as more than 80% transparency in UV region.

Morphology-Controlled Synthesis of Single Crystalline α-Mn2O3 Sea-Urchins Assembled with Pen-Type Nanoneedles and Broad Absorption Spectrum

2015 ◽  
Vol 33 ◽  
pp. 38-48 ◽  
Author(s):  
Qurat Ul Ain Javed ◽  
Hussain Abbas ◽  
Hasan Mahmood ◽  
Abdul Sattar ◽  
Feng Ping Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sea Urchin ◽  
Sea Urchins ◽  
Experimental Conditions ◽  
Hydrothermal Temperature ◽  
Single Crystalline ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible

Single crystalline high quality α-Mn2O3nanorods and sea-urchins assembled with pen-type nanoneedles have been successfully synthesized by template-free hydrothermal route. The variation in hydrothermal temperature has affected the morphology of the α-Mn2O3sea-urchin assembled with the nanoneedles noticeably. The influence of temperature change on the thickness, crystallinity, surface morphology and optical properties of α-Mn2O3has been characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) analysis, Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM), Raman Spectroscopy (RS) and UV-visible Spectroscopy. The results showed that in our experimental conditions, single crystalline nanorods of the α-Mn2O3were obtained at a low temperature of 180 °C, while single crystalline sea-urchin assembled with pen-type nanoneedles were obtained by increasing the temperature to 280 °C. Nanorods and sea-urchin assembled with pen-type nanoneedles obtained had the well defined morphology and crystalline quality. The sea-urchin synthesized at 280 °C exhibited more than 90% absorption in UV-visible spectrum.

Intercalation of Gold Nanoparticles into Na-Montmorillonite

2013 ◽  
Vol 716 ◽  
pp. 360-363
Author(s):  
Peng Quan Yao ◽  
Lin Hua Zhu ◽  
Tian Si ◽  
Jin Yang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Colloidal Particles ◽  
Fluorescence Analysis ◽  
Gold Colloid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Polyallylamine Hydrochloride

Several type of gold precursors including pre-synthesized Au (en)2Cl3and gold colloid were tried to intercalate into the layer space of Na-Montmorillonite (Na-MMT). In the preparation, DDA and PAA were employed to cap the pre-synthesized gold colloidal particles and then intercalated into Na-MMT, and the Au (en)2Cl3was directly intercalated to Na-MMT through cation exchange. X-ray diffraction (XRD), fluorescence analysis (XRF) and transmission electron microscopy (TEM) were used to characterize the prepared samples. The results showed that the gold colloid modified by dodecylamine (DDA) and polyallylamine hydrochloride (PAA) respectively were successfully intercalated into the layer gallery of Na-MMT based on the mechanism of covalent capture. However, thermal treatment at 773K for 2h resulted in migration of gold nanoparticles from layer space to the out surface of the Na-MMT.

Biomimetic keratin gold nanoparticle-mediated in vitro photothermal therapy on glioblastoma multiforme

Nanomedicine ◽  
2021 ◽  
Author(s):  
Alexa Guglielmelli ◽  
Paolo Rosa ◽  
Marco Contardi ◽  
Mirko Prato ◽  
Giorgio Mangino ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Photothermal Heating ◽  
Transmission Electron ◽  
Structural And Functional Properties ◽  
Uv Visible ◽  
New Generation

Aim: To realize and characterize a new generation of keratin-coated gold nanoparticles (Ker-AuNPs) as highly efficient photosensitive nanosized therapeutics for plasmonic photothermal (PPT) therapy. Materials & methods: The chemical, physical, morphological and photothermal properties of Ker-AuNPs are investigated using dynamic light scattering, ζ-potential, UV–Visible, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, transmission electron microscopy and high-resolution thermography. In vitro experiments are performed on a human glioblastoma cell line (i.e., U87-MG), using viability assays, transmission electron microscopy, fluorescence microscopy, cytometric analyses and PPT experiments. Results: Experiments confirm the excellent biocompatibility of Ker-AuNPs, their efficient cellular uptake and localized photothermal heating capabilities. Conclusion: The reported structural and functional properties pointed out these Ker-AuNPs as a promising new tool in the field of biocompatible photothermal agents for PPT treatments against cancer-related diseases.

Photoluminescence profile mapping of Eu(iii) and Tb(III → IV)-embedded in quantum size SnO2 nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (59) ◽  
pp. 31155-31161 ◽  
Author(s):  
Young In Choi ◽  
Youngku Sohn
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sno2 Nanoparticles ◽  
Spectroscopic Properties ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Quantum Size ◽  
Transmission Electron ◽  
Uv Visible

Eu(iii) and Tb(iv) activators were embedded in quantum size SnO2 nanoparticles by a hydrothermal method and their morphologies, crystal structures and spectroscopic properties were examined by transmission electron microscopy, X-ray diffraction crystallography, UV-visible absorption, and 2D/3D-photoluminescence mapping.

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