scholarly journals Spontaneous self-assembly and disassembly of colloidal gold nanoparticles induced by tetrakis(hydroxymethyl) phosphonium chloride

2016 ◽  
Vol 52 (6) ◽  
pp. 1266-1269 ◽  
Author(s):  
Christopher P. Gulka ◽  
Alexis C. Wong ◽  
David W. Wright
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Colloidal Gold ◽  
Gold Colloids ◽  
Phosphonium Chloride ◽  
Colloidal Gold Nanoparticles

The mechanism behind self-assembly and disassembly of gold colloids driven by addition of a phosphonium was characterized using 31P NMR.

π–π interactions mediated self-assembly of gold nanoparticles into single crystalline superlattices in solution

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90766-90771 ◽  
Author(s):  
FuKe Wang ◽  
Yuriy A. Akimov ◽  
Eng Huat Khoo ◽  
Chaobin He
Keyword(s):  
Gold Nanoparticles ◽  
Long Range ◽  
Self Assembly ◽  
Colloidal Gold ◽  
Ligand Exchange ◽  
Single Crystalline ◽  
Π Interactions ◽  
Colloidal Gold Nanoparticles ◽  
Aromatic Thiols ◽  
Long Range Ordering

Self-assembly of colloidal gold nanoparticles employing π–π interactions in solution is studied. It is shown that capping ligand exchange with aromatic thiols results in formation of 3D single crystalline superlattices with long-range ordering.

Dense aqueous colloidal gold nanoparticles prepared from highly concentrated precursor solution

2011 ◽  
Vol 362 (2) ◽  
pp. 325-329 ◽  
Author(s):  
Tetsuro Soejima ◽  
Seisaku Oshiro ◽  
Yasuji Nakatsuji ◽  
Seishiro Ito
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Precursor Solution ◽  
Colloidal Gold Nanoparticles

An enhanced ELISA based on modified colloidal gold nanoparticles for the detection of Pb(II)

2011 ◽  
Vol 26 (8) ◽  
pp. 3700-3704 ◽  
Author(s):  
Yu Zhou ◽  
Xiang-Li Tian ◽  
Yan-Song Li ◽  
Feng-Guang Pan ◽  
Yuan-Yuan Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Colloidal Gold Nanoparticles

Effect of Voltage on Colloidal Gold (Au) Nanoparticles Produced Using Electro-Dissolution-Reduction Method

2015 ◽  
Vol 1115 ◽  
pp. 386-389
Author(s):  
Haroon Haiza ◽  
I.I. Yaacob ◽  
Ahmad Zahirani Ahmad Azhar
Keyword(s):  
Gold Nanoparticles ◽  
Electron Microscope ◽  
Colloidal Gold ◽  
Reduction Process ◽  
Chloride Ions ◽  
Complex Ions ◽  
Dc Power ◽  
Colloidal Gold Nanoparticles ◽  
Transmission Electron ◽  
The Mean

Colloidal gold nanoparticles have been successfully prepared using a simple two-electrode cells connected to a DC power supply. During the electro-dissolution-reduction process, the bulk gold at the anode oxidized into gold cations which then reacted with the chloride ions to form aurochloride complex. The complex ions were then reduced by the citrate ion to form colloidal gold nanoparticles. The size and shape of the nanoparticles were modulated by varying the terminal voltages. The colloidal gold nanoparticles obtained were characterized by field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and ultraviolet-visible spectrophotometer (UV-Vis). From FESEM analysis, it was found that by increasing the voltage, the size of colloidal gold nanoparticles produced marginally decreased. The mean sizes of gold nanoparticles were roughly about 23.5 nm, 23.2 nm and 19.3 nm for 32 V, 36 V and 40 V, respectively. TEM micrograph showed that the shape of gold nanoparticles obtained is almost spherical. The characteristic peaks of UV-Vis spectra revealed that the suspension was indeed colloidal gold nanoparticles. Keywords: Gold, Nanoparticles, Electro-dissolution-reduction

scholarly journals Back Cover: Unconventional Chain-Growth Mode in the Assembly of Colloidal Gold Nanoparticles (Angew. Chem. Int. Ed. 32/2012)

2012 ◽  
Vol 51 (32) ◽  
pp. 8122-8122 ◽  
Author(s):  
Hong Wang ◽  
Liyong Chen ◽  
Xiaoshuang Shen ◽  
Liangfang Zhu ◽  
Jiating He ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Growth Mode ◽  
Chain Growth ◽  
Back Cover ◽  
Colloidal Gold Nanoparticles

scholarly journals Detection and difference analysis of the enzyme activity of colloidal gold nanoparticles with negatively charged surfaces prepared by different reducing agents

2021 ◽  
Author(s):  
Junjun Cao ◽  
Jie Zhang ◽  
Ning Yuan ◽  
Yixiao Sun ◽  
Zhihua Xu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Enzyme Activity ◽  
Hydroxyl Radical ◽  
Colloidal Gold ◽  
Negative Charge ◽  
Linear Chain ◽  
Reducing Agents ◽  
Difference Analysis ◽  
Charged Surfaces ◽  
Colloidal Gold Nanoparticles

Abstract Research on the activity of nanoenzymes has always been a focus of nanomaterials. In this study, several reducing agents with different structures were used to prepare colloidal gold with a negative charge and similar size by controlling the temperature and pH. The affinity analysis of the substrate H 2 O 2 and TMB showed that the activity of colloidal gold nanoenzymes prepared by different reducing agents was in the order of Cc, Hq, Rs, Vc, Ga, Sc, Sm, St. The rule is that the enzyme activity of colloidal gold reduced by benzene ring is higher than that of colloidal gold enzyme reduced by linear chain. Finally, we discussed the activity of colloidal gold peroxidase from the number and position of isomers and functional groups, and demonstrated that the nanoenzyme activity affected the surface activity of colloidal gold, the elimination of hydroxyl radical and TMB binding efficiency.

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