Laser-driven phase transitions in aqueous colloidal gold nanoparticles under high pressure: picosecond pump–probe study

2016 ◽  
Vol 18 (6) ◽  
pp. 4994-5004 ◽  
Author(s):  
Shuichi Hashimoto ◽  
Tetsuro Katayama ◽  
Kenji Setoura ◽  
Michael Strasser ◽  
Takayuki Uwada ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
High Pressure ◽  
Phase Transitions ◽  
Pulsed Laser ◽  
Water Layer ◽  
Liquid Droplets ◽  
Pump Probe ◽  
Gold Colloids ◽  
Laser Illumination ◽  
Colloidal Gold Nanoparticles

Pulsed-laser illumination of aqueous gold colloids under high pressure enables evaporation from liquid droplets surrounded by a supercritical water layer.

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.

Picosecond-to-Nanosecond Dynamics of Plasmonic Nanobubbles from Pump–Probe Spectral Measurements of Aqueous Colloidal Gold Nanoparticles

Langmuir ◽  
2014 ◽  
Vol 30 (31) ◽  
pp. 9504-9513 ◽  
Author(s):  
Tetsuro Katayama ◽  
Kenji Setoura ◽  
Daniel Werner ◽  
Hiroshi Miyasaka ◽  
Shuichi Hashimoto
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Spectral Measurements ◽  
Pump Probe ◽  
Colloidal Gold Nanoparticles ◽  
Nanosecond Dynamics

Effect of adsorption kinetics on dissociation of DNA-nucleobases on gold nanoparticles under pulsed laser illumination

2017 ◽  
Vol 19 (17) ◽  
pp. 10796-10803 ◽  
Author(s):  
Robin Schürmann ◽  
Ilko Bald
Keyword(s):  
Gold Nanoparticles ◽  
Adsorption Kinetics ◽  
Photothermal Therapy ◽  
Pulsed Laser ◽  
Kinetics Of Adsorption ◽  
Laser Illumination ◽  
Dna Nucleobases ◽  
Kinetics Of

The kinetics of adsorption and photofragmentation of DNA nucleobase analogues on gold nanoparticles is evaluated towards an improvement of cancer photothermal therapy.

Optimization of Gold Nanoparticles Synthesis using Design of Experiments Technique

2017 ◽  
Vol 68 (7) ◽  
pp. 1518-1423
Author(s):  
Adina Turcu Stiolica ◽  
Mariana Popescu ◽  
Maria Viorica Bubulica ◽  
Carmen Nicoleta Oancea ◽  
Claudiu Nicolicescu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Zeta Potential ◽  
Design Of Experiments ◽  
Process Model ◽  
Sodium Citrate ◽  
Drug Carriers ◽  
Chloroauric Acid ◽  
Gold Colloids ◽  
Citrate Concentration ◽  
Vis Spectroscopy

Gold nanoparticles are considered the newest drug carriers for different diseases. Therefore it is appropriate continuous optimization of their preparation. In this study, gold colloids with an average size of 1 - 26 nm were obtained by the reduction of tetrachloroauric acid with trisodium citrate. The nanomaterials were characterized by UV-Vis spectroscopy and dynamic light scattering technique. In addition, zeta potential was measured for samples synthesized in order to determine the stability of the colloids. A Two-level Full Factorial design was chosen to determine the optimum set of process parameters (chloroauric acid concentration and sodium citrate concentration) and their effect on various gold nanoparticles characteristics (size and zeta potential). These effects were quantified using Design of Experiments (DoE) with 5 runs and 1 centerpoint. The selected objective and process model in this investigation are screening and interaction. Findings from this research show that to obtain particles larger than 35 nm, it is recommended to increase sodium citrate concentration, at low chloroauric acid values. These conditions will help to achieve smaller zeta potential, too.

scholarly journals High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Akun Liang ◽  
Robin Turnbull ◽  
Enrico Bandiello ◽  
Ibraheem Yousef ◽  
Catalin Popescu ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Synchrotron Radiation ◽  
Infrared Radiation ◽  
Room Temperature ◽  
Far Infrared ◽  
Low Pressure ◽  
Pressure Response ◽  
Spectroscopy Study ◽  
Far Infrared Radiation

We report the first high-pressure spectroscopy study on Zn(IO3)2 using synchrotron far-infrared radiation. Spectroscopy was conducted up to pressures of 17 GPa at room temperature. Twenty-five phonons were identified below 600 cm−1 for the initial monoclinic low-pressure polymorph of Zn(IO3)2. The pressure response of the modes with wavenumbers above 150 cm−1 has been characterized, with modes exhibiting non-linear responses and frequency discontinuities that have been proposed to be related to the existence of phase transitions. Analysis of the high-pressure spectra acquired on compression indicates that Zn(IO3)2 undergoes subtle phase transitions around 3 and 8 GPa, followed by a more drastic transition around 13 GPa.

scholarly journals Equation of state studies at SILP by laser-driven shock waves

1996 ◽  
Vol 14 (2) ◽  
pp. 157-169 ◽  
Author(s):  
Yuan Gu ◽  
Sizu Fu ◽  
Jiang Wu ◽  
Songyu Yu ◽  
Yuanlong Ni ◽  
...  
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Equation Of State ◽  
Shock Waves ◽  
Target Surface ◽  
Shock Adiabats ◽  
Pressure Shock ◽  
Aluminum Target ◽  
Laser Illumination ◽  
The Stability

The experimental progress of laser equation of state (EOS) studies at Shanghai Institute of Laser Plasma (SILP) is discussed in this paper. With a unique focal system, the uniformity of the laser illumination on the target surface is improved and a laser-driven shock wave with good spatial planarity is obtained. With an inclined aluminum target plane, the stability of shock waves are studied, and the corresponding thickness range of the target of laser-driven shock waves propagating steadily are given. The shock adiabats of Cu, Fe, SiO2 are experimentally measured. The pressure in the material is heightened remarkably with the flyer increasing pressure, and the effect of the increasing pressure is observed. Also, the high-pressure shock wave is produced and recorded in the experimentation of indirect laser-driven shock waves with the hohlraum target.

High-pressure phase transitions in AlSb

2001 ◽  
Vol 62 (5) ◽  
pp. 941-949 ◽  
Author(s):  
H. Hirano ◽  
S. Uehara ◽  
A. Mori ◽  
A. Onodera ◽  
K. Takemura ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Pressure Phase ◽  
Pressure Phase
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