Mechanism of Gold Nanoparticle Formation in the Classical Citrate Synthesis Method Derived from Coupled In Situ XANES and SAXS Evaluation

2010 ◽  
Vol 132 (4) ◽  
pp. 1296-1301 ◽  
Author(s):  
Jörg Polte ◽  
T. Torsten Ahner ◽  
Friedmar Delissen ◽  
Sergey Sokolov ◽  
Franziska Emmerling ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Synthesis Method ◽  
Nanoparticle Formation ◽  
In Situ Xanes

scholarly journals Enhanced Extracellular Synthesis of Gold Nanoparticles by Soluble Extracts from Escherichia coli Transformed with Rhizobium tropici Phytochelatin Synthase Gene

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 472
Author(s):  
Qunying Yuan ◽  
Manjula Bomma ◽  
Zhigang Xiao
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Synthesis Method ◽  
Nanoparticle Synthesis ◽  
Morphological Properties ◽  
Phytochelatin Synthase ◽  
Rhizobium Tropici ◽  
Whole Cells ◽  
E Coli ◽  
Recombinant Cells

Phytochelatins, the enzymatic products of phytochelatin synthase, play a principal role in protecting the plants from heavy metal and metalloid toxicity due to their ability to scavenge metal ions. In the present study, we investigated the capacity of soluble intracellular extracts from E. coli cells expressing R. tropici phytochelatin synthase to synthesize gold nanoparticle. We discovered that the reaction mediated by soluble extracts from the recombinant E. coli cells had a higher yield of gold nanoparticles, compared to that from the control cells. The compositional and morphological properties of the gold nanoparticles synthesized by the intracellular extracts from recombinant cells and control cells were similar. In addition, this extracellular nanoparticle synthesis method produced purer gold nanoparticles, avoiding the isolation of nanoparticles from cellular debris when whole cells are used to synthesize nanoparticles. Our results suggested that phytochelatins can improve the efficiency of gold nanoparticle synthesis mediated by bacterial soluble intracellular extracts, and the potential of extracellular nanoparticle synthesis platform for the production of nanoparticles in large quantity and pure form is worth further investigation.

In situ time-resolved DXAFS study of Rh nanoparticle formation mechanism in ethylene glycol at elevated temperature

2012 ◽  
Vol 14 (9) ◽  
pp. 2983 ◽  
Author(s):  
Hiroyuki Asakura ◽  
Kentaro Teramura ◽  
Tetsuya Shishido ◽  
Tsunehiro Tanaka ◽  
Ning Yan ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Ethylene Glycol ◽  
Formation Mechanism ◽  
Time Resolved ◽  
Nanoparticle Formation

In Situ Observation of Plasmon Tuning in a Single Gold Nanoparticle during Controlled Melting

Nano Letters ◽  
2013 ◽  
Vol 13 (5) ◽  
pp. 2041-2046 ◽  
Author(s):  
Alexander Kuhlicke ◽  
Stefan Schietinger ◽  
Christian Matyssek ◽  
Kurt Busch ◽  
Oliver Benson
Keyword(s):  
Gold Nanoparticle ◽  
In Situ Observation

In Situ Study of Fe3Pt–Fe2O3 Core–Shell Nanoparticle Formation

2015 ◽  
Vol 137 (47) ◽  
pp. 14850-14853 ◽  
Author(s):  
Wen-I Liang ◽  
Xiaowei Zhang ◽  
Yunlong Zan ◽  
Ming Pan ◽  
Cory Czarnik ◽  
...  
Keyword(s):  
Core Shell ◽  
Nanoparticle Formation ◽  
In Situ Study

scholarly journals Dealloying progress during nanoporous structure evolution analyzed by in situ resistometry

2017 ◽  
Vol 19 (44) ◽  
pp. 29880-29885 ◽  
Author(s):  
Eva-Maria Steyskal ◽  
Michael Seidl ◽  
Matthias Graf ◽  
Roland Würschum
Keyword(s):  
Electrochemical Synthesis ◽  
Synthesis Method ◽  
Nanoporous Structure ◽  
Structure Evolution ◽  
Nanoporous Structures

The progress of dealloying, an electrochemical synthesis method capable of producing nanoporous structures with bulk outer dimensions, is studied by in situ resistometry.

Negative Permittivity Behavior in Silver/Polyaniline Metacomposites Induced by the Low-Frequency Plasmonic Oscillation

2021 ◽  
Author(s):  
Jiahong Tian ◽  
Runhua Fan ◽  
Zongxiang Wang ◽  
Jiahao Xin ◽  
Zhongyang Wang
Keyword(s):  
Synthesis Method ◽  
Low Frequency ◽  
In Situ Synthesis ◽  
Negative Permittivity ◽  
Free Electrons ◽  
Dominant Effect ◽  
Equivalent Circuit Analysis ◽  
Inductive Character ◽  
Percolation Network

Abstract Silver/polyaniline (Ag/PANI) composites were prepared by an in-situ synthesis method. Interestingly, the permittivity changed from positive to negative along with the formation of percolation network. The plasma oscillations of free electrons from the network made a dominant effect on the negative permittivity behavior. Further investigation based on equivalent circuit analysis revealed that the composites with negative permittivity presented inductive character. The epsilon-negative composites can be applied to electromagnetic shielding, absorbing and attenuation.

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