Water-Soluble Pd Nanoparticles Capped with Glutathione: Synthesis, Characterization, and Magnetic Properties

Langmuir ◽  
2012 ◽  
Vol 28 (45) ◽  
pp. 15958-15965 ◽  
Author(s):  
Sachil Sharma ◽  
Bit Kim ◽  
Dongil Lee
Keyword(s):  
Magnetic Properties ◽  
Pd Nanoparticles ◽  
Water Soluble ◽  
Glutathione Synthesis

A water-soluble gadolinium metallofullerenol: facile preparation, magnetic properties and magnetic resonance imaging application

2016 ◽  
Vol 45 (21) ◽  
pp. 8696-8699 ◽  
Author(s):  
Jie Li ◽  
Taishan Wang ◽  
Yongqiang Feng ◽  
Ying Zhang ◽  
Mingming Zhen ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Properties ◽  
Magnetic Resonance ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
Water Soluble ◽  
Resonance Imaging ◽  
Imaging Application ◽  
Facile Preparation ◽  
Imaging Performance

A new water-soluble gadolinium metallofullerenol with an enhanced effective magnetic moment and improved T1-weighted relaxivity and magnetic resonance imaging performance in the liver.

The Rational Design and Synthesis of Water-Soluble Thiourea Ligands for Recoverable Pd-Catalyzed Aerobic Aqueous Suzuki–Miyaura Reactions at Room Temperature

Synthesis ◽  
2018 ◽  
Vol 50 (07) ◽  
pp. 1499-1510 ◽  
Author(s):  
Wei Chen ◽  
Xiao-Yan Lu ◽  
Bei-Hua Xu ◽  
Wei-guo Yu ◽  
Zi-niu Zhou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rational Design ◽  
Pd Nanoparticles ◽  
Water Soluble ◽  
Tem Analysis ◽  
Arylboronic Acids ◽  
Design And Synthesis ◽  
Black Precipitate ◽  
Aryl Bromides ◽  
Carboxylic Groups

Eight precatalysts containing carboxylic-functionalized thiourea ligands are prepared and their activities and recyclability are evaluated in aerobic aqueous Suzuki–Miyaura reactions. A bulky monothiourea–Pd complex, functionalized with four carboxylic groups, shows the best activity and recyclability in the coupling of aryl bromides with arylboronic acids. The catalyst can be reused at least five times without any significant reduction in its catalytic activity. TEM analysis and the confirmed catalytic activity of the observed black precipitate reveal that Pd nanoparticles are formed during the reactions and are stabilized by the carboxylic-functionalized thiourea ligands.

scholarly journals Kinetic Analysis of 4-Nitrophenol Reduction by “Water-Soluble” Palladium Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1169 ◽  
Author(s):  
Anas Iben Ayad ◽  
Denis Luart ◽  
Aissa Ould Dris ◽  
Erwann Guénin
Keyword(s):  
Thermodynamic Parameters ◽  
Sodium Borohydride ◽  
Catalytic Reduction ◽  
Pd Nanoparticles ◽  
Water Soluble ◽  
Reactant Ratio ◽  
First Order ◽  
Vis Spectroscopy ◽  
Pseudo First Order ◽  
Kinetics Of

The most important model catalytic reaction to test the catalytic activity of metal nanoparticles is the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride as it can be precisely monitored by UV–vis spectroscopy with high accuracy. This work presents the catalytic reduction of 4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp) in the presence of Pd nanoparticles and sodium borohydride as reductants in water. We first evaluate the kinetics using classical pseudo first-order kinetics. We report the effects of different initial 4-Nip and NaBH4 concentrations, reaction temperatures, and mass of Pd nanoparticles used for catalytic reduction. The thermodynamic parameters (activation energy, enthalpy, and entropy) were also determined. Results show that the kinetics are highly dependent on the reactant ratio and that pseudo first-order simplification is not always fit to describe the kinetics of the reaction. Assuming that all steps of this reaction proceed only on the surface of Pd nanoparticles, we applied a Langmuir−Hinshelwood model to describe the kinetics of the reaction. Experimental data of the decay rate of 4-nitrophenol were successfully fitted to the theoretical values obtained from the Langmuir–Hinshelwood model and all thermodynamic parameters, the true rate constant k, as well as the adsorption constants of 4-Nip, and BH4− (K4-Nip and KBH4−) were determined for each temperature.

Core-shell model for the magnetic properties of Pd nanoparticles

2012 ◽  
Vol 68 ◽  
pp. 347-349 ◽  
Author(s):  
M.S. Seehra ◽  
J.D. Rall ◽  
J.C. Liu ◽  
C.B. Roberts
Keyword(s):  
Magnetic Properties ◽  
Shell Model ◽  
Pd Nanoparticles ◽  
Core Shell

Synthesis of Water-Soluble Fe3O4 Nanopowder and its Cr(VI) Adsorption Properties

2012 ◽  
Vol 624 ◽  
pp. 55-58 ◽  
Author(s):  
Hong Liang Wan ◽  
W. Deligeer ◽  
Si Qin Zhao ◽  
S. Asuha
Keyword(s):  
Thermal Decomposition ◽  
Magnetic Properties ◽  
Triethylene Glycol ◽  
Mesoporous Structure ◽  
Adsorption Properties ◽  
Water Soluble ◽  
Maximum Adsorption Capacity ◽  
Urea Complex ◽  
Reflux Time ◽  
Adsorptive Properties

In this work, water-soluble Fe3O4 nanopowder with mesoporous structure was prepared by the thermal decomposition of Fe-urea complex ([Fe(NH2CONH2)6](NO3)3) in triethylene glycol (TEG), and the effects of reflux time and the concentration of precursor on the properties of Fe3O4 nanopowder were investigated. In addition, the adsorptive properties of the material were studied using Cr(VI) as a target pollutant. Prolonging reflux time and increase in concentration of [Fe(NH2CONH2)6](NO3)3 in TEG can effectively improve the crystallinity and magnetic properties of the Fe3O4 nanopowder. The saturation magnetization (Ms) increases from 21.4 to 48.5 emu/g when the reflux time increases from 2 to 20 h. The maximum adsorption capacity of the Fe3O4 nanopowder for Cr(VI) is estimated to be 21.6 mg/g.

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