Size-Controlled Synthesis of Hyperbranched Polymer Protected Gold Nanoparticles

2011 ◽  
Vol 332-334 ◽  
pp. 2112-2115
Author(s):  
De Suo Zhang ◽  
Hong Lin ◽  
Yu Yue Chen
Keyword(s):  
Gold Nanoparticles ◽  
Hyperbranched Polymer ◽  
Molar Ratio ◽  
Controlled Synthesis ◽  
Ft Ir ◽  
Ir Analysis ◽  
Uv Visible ◽  
Size Controlled ◽  
Nanoparticles Dispersions ◽  
Hyperbranched Polyamide

Gold nanoparticles dispersions were prepared by hyperbranched polyamide (HB-PA) in aqueous solution without additional reducing agents. The prepared gold nanoparticles/polymer composites were characterized by UV-visible spectrophotometer, TEM and HPPS. The size of the synthesized gold nanoparticles decreases with the increase of the molar ratio of nitrogen in HB-PA to Au atoms. EDS, XRD as well as XPS were further employed to verify these particles were indeed metallic gold nanoparticles and FT-IR analysis showed the interaction between gold nanoparticles and polymers. These techniques indicated the tunability of the size of gold nanoparticles by HB-PA which can also serves as a layer of protection for them.

Size-Controlled Synthesis of Gold Nanoparticles via High-Temperature Reduction

Langmuir ◽  
2004 ◽  
Vol 20 (8) ◽  
pp. 3021-3023 ◽  
Author(s):  
David A. Fleming ◽  
Mary Elizabeth Williams
Keyword(s):  
Gold Nanoparticles ◽  
High Temperature ◽  
Controlled Synthesis ◽  
Temperature Reduction ◽  
Size Controlled

Water-Soluble N-Heterocyclic Carbene-Protected Gold Nanoparticles: Size-Controlled Synthesis, Stability, and Optical Properties

2017 ◽  
Vol 129 (22) ◽  
pp. 6294-6298 ◽  
Author(s):  
Kirsi Salorinne ◽  
Renee W. Y. Man ◽  
Chien-Hung Li ◽  
Masayasu Taki ◽  
Masakazu Nambo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Water Soluble ◽  
Controlled Synthesis ◽  
Size Controlled

SYNTHESIS AND CHARACTERIZATION OF HEXAMETHYLENE TETRAMINE (HMTA) CAPPED CdS NANOPARTICLES BY HYDROTHERMAL METHOD

2011 ◽  
Vol 10 (03) ◽  
pp. 441-445 ◽  
Author(s):  
M. KARL CHINNU ◽  
L. SARAVANAN ◽  
R. JAYAVEL ◽  
C. M. RAGHAVAN ◽  
K. VIJAI ANAND ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Cadmium Acetate ◽  
Cds Nanoparticles ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Hexamethylene Tetramine ◽  
Ft Ir ◽  
Ir Analysis ◽  
Uv Visible

Cadmium sulfide nanoparticles have been synthesized by hydrothermal method using cadmium acetate, thiosemicarbazide, and sodium hydroxide as precursors with hexamethylene tetramine as the surfactant. From the X-ray diffraction analysis, it is observed that synthesized CdS nanoparticles show cubic phase. The presence of HMTA in CdS was confirmed by FT-IR analysis. The bandgap value of CdS nanostructure has been estimated by DRS–UV-Visible spectral analysis. The formation of flower-like nanoclusters was observed using scanning electron microscopy (SEM). The application of CdS nanoparticles in photocatalytic degradation was also studied.

scholarly journals One-Pot Synthesis of Cationic Gold Nanoparticles by Differential Reduction

2017 ◽  
Vol 231 (1) ◽  
Author(s):  
Ralph A. Sperling ◽  
Lorena García-Fernández ◽  
Isaac Ojea-Jiménez ◽  
Jordi Piella ◽  
Neus G. Bastús ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Controlled Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Differential Reduction ◽  
Size Controlled ◽  
Cationic Gold

AbstractThe size-controlled synthesis of cationic particles by differential reduction of HAuCl

Size-controlled Synthesis of Gold Nanoparticles by Thermolysis of a Gold(I)-Sulfide Complex in the Presence of Alkylamines

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1305-1311 ◽  
Author(s):  
Mari Yamamoto ◽  
Yukiyasu Kashiwagi ◽  
Masami Nakamoto
Keyword(s):  
Gold Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Thermal Analyses ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkyl Chains ◽  
Transmission Electron ◽  
Gas Chromatography Mass Spectroscopy ◽  
Size Controlled

A size-controlled synthesis of gold nanoparticles has been developed by the thermolysis of AuCl(SMe2) in the presence of alkylamines at 120 °C. In the procedure, the key intermediate was [Au(NH2R)2]Cl, detected by electrospray ionization (ESI) mass spectrometry. This thermally unstable intermediate was reduced by alkylamines under mild conditions to produce alkylamine-capped gold nanoparticles. The average diameters of the gold nanoparticles could be regulated in a range from 4.3 to 6.1 nm by applying primary alkylamines with alkyl chains of different lengths. Larger gold nanoparticles with diameters from 10 to 22 nm were prepared by a combination of alkylamines and alkylcarboxylic acids with various lengths of the alkyl chains. The gold nanoparticles were characterized by transmission electron microscopy (TEM), UV/Vis absorption spectroscopy, powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), gas chromatography/mass spectroscopy (GC/MS), and thermogravimetric and differencial thermal analyses (TG/DTA)

scholarly journals Synthesis of Evolvulus alsinoides derived gold nanoparticles for medical applications

2016 ◽  
Vol 2 (1) ◽  
pp. 38 ◽  
Author(s):  
R. Anbarasu ◽  
G. Selvan ◽  
S. Baskar ◽  
V. Raja
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Leaf Extracts ◽  
Visible Absorption ◽  
Evolvulus Alsinoides ◽  
Biological Compatibility ◽  
Optical And Electronic Properties ◽  
Ft Ir ◽  
Ir Analysis ◽  
Size Dispersion

Plant mediated synthesis of metallic nanoparticles is an increasing commercial demand due to the wide applicability in various areas such as electronics, catalysis, chemistry, energy, cosmetics and medicine. This is greatly due to their special features, which include unusual optical and electronic properties, high stability and biological compatibility, controllable morphology and size dispersion, and easy surface functionalization. In the present investigation, synthesis of gold nanoparticle is done by using leaf extracts of Evolvulus alsinoides. Gold nanoparticles (AuNPs) were characterized by using UV visible absorption spectra. Their morphology, elemental composition and crystalline phase were determined by scanning electron microscopy, energy dispersive X-ray spectroscopy and FT-IR analysis was used to confirm the presence of gold nanoparticles in the extracts. The plant derived gold nanoparticles were also showing more inhibition activity in both bacterial and fungus strains. In bacteria, gram negative strains are highly affected by the test samples than gram positive. In fungal strains, the highest effect was noticed in Trichophyton rubrum while less effect was observed in Candida albicans.

scholarly journals Molecular Structure and Spectral Characterization of Diamagnetic Co(III) Complex Incorporating Hexaadentate Schiff Base Ligand

2019 ◽  
Vol 31 (8) ◽  
pp. 1871-1876
Author(s):  
Eida S. Al-Farraj ◽  
Amani S. Alturiqi ◽  
Murefah M. Anazy ◽  
Reda A. Ammar
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Atomic Charge ◽  
Molar Ratio ◽  
Lumo Energy ◽  
Ft Ir ◽  
Uv Visible ◽  
Homo Lumo ◽  
Mulliken Atomic Charge

A novel Co(III) complex derived from hexaadentate Schiff base ligand, H3L was described. The ligand is prepared from the reaction of tris-2-aminoethyl amine and o-vanillin in 1:3 molar ratio. The structure of the ligand and its Co(III) complex was described by micro-analyses, FT-IR, NMR, ESI-MS and UV/visible and thermal stability. DFT study was carried out to get insights into the ligand and its Co(III) complex to compare the values of bond lengths and angles with each other. The electronic spectra, Mulliken atomic charge distribution, HOMO-LUMO energy and the thermodynamic parameters have been calculated.

scholarly journals Size Controlled Synthesis of FeCo Alloy Nanoparticles and Study of the Particle Size and Distribution Effects on Magnetic Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
A. Shokuhfar ◽  
S. S. S. Afghahi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Molar Ratio ◽  
Microemulsion System ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles ◽  
Feco Alloy ◽  
Transmission Electron ◽  
Size Controlled

In this research the size controlled synthesis of FeCo nanoparticles was done using a quaternary microemulsion system. X-ray diffraction and high resolution transmission electron microscopy of as-synthesized nanoparticles confirm the formation of FeCo alloy nanoparticles. The effects of two process parameters, namely, water to surfactant molar ratio and molar concentration of metal salts, on the size and size distribution of nanoparticles were discussed by the aid of transmission electron microscopy. The size dependency of magnetic properties was also investigated using a room temperature vibrating sample magnetometer. The superparamagnetic-ferromagnetic and single domain-multidomain transition sizes were determined. Then the specific absorption rates at transition sizes were calculated and the best sample for magnetic hyperthermia treatment was introduced.

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