Photoacoustic Signal Generation in Gold Nanospheres in Aqueous Solution: Signal Generation Enhancement and Particle Diameter Effects

2016 ◽  
Vol 120 (48) ◽  
pp. 27646-27656 ◽  
Author(s):  
Genny A. Pang ◽  
Jan Laufer ◽  
Reinhard Niessner ◽  
Christoph Haisch
Keyword(s):  
Aqueous Solution ◽  
Particle Diameter ◽  
Photoacoustic Signal ◽  
Signal Generation ◽  
Gold Nanospheres

scholarly journals Quenching of nonlinear photoacoustic signal generation in gold nanoparticles through coating

2020 ◽  
Vol 2 (7) ◽  
pp. 2699-2704
Author(s):  
Genny A. Pang ◽  
Christoph Haisch ◽  
Jan Laufer
Keyword(s):  
Gold Nanoparticles ◽  
Photoacoustic Signal ◽  
Signal Generation ◽  
Gold Nanospheres ◽  
Particle Coating ◽  
Biochemical Sensing

The nonlinear photoacoustic signal behavior from gold nanospheres is suppressed through particle coating, which can be used for biochemical sensing.

An Improved Theory of Photoacoustic Signal Generation in Gases and Liquids

1991 ◽  
pp. 511-515
Author(s):  
András Miklós ◽  
Zoltán Bozóki ◽  
András Lőrincz
Keyword(s):  
Photoacoustic Signal ◽  
Signal Generation

Controllable Synthesis of Spheroid Hydroxyapatite Nanoparticles by Rverse Microemulsion Method

2012 ◽  
Vol 602-604 ◽  
pp. 227-230
Author(s):  
Tao Fan ◽  
Yan Rong Sun ◽  
Li Guo Ma
Keyword(s):  
Aqueous Solution ◽  
Water Content ◽  
Ph Value ◽  
Particle Diameter ◽  
Diameter Distribution ◽  
Hydroxyapatite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Homogeneous Good

Spheroid hydroxyapatite nanoparticles were successfully prepared by titrating Ca(NO3)2•4H2O and (NH4)2HPO4 aqueous solution in the reverse microemulsion, which consists of mixed OP-10(surfactant), cyclohexane(oil phase), and isobutanol (cosurfactant).The structure and morphology of the prepared powders were characterized by means of X-ray diffraction (XRD) and transmission electron microscope (TEM). The optimum composition was investigated via the analysis of the aqueous solution conductivity, and the mechanism of aqueous reaction. The effect of the pH value and the amount of surfactant on the particle size were studied. The results indicate that the best conditions are which the concentration of OP-10 and isobutanol both are 0.2 M, when the water content is between 130 ml-250 ml，it results in pure nano-hydroxyapatite spheroid-like powders, and the water content is about 200 ml, whose diameters are 50 nm-80 nm, and good particle diameter distribution, the particle microstructure is homogeneous, good crystal structure and higher crystallinity.

Photoacoustic signal generation in leaves: are O2-consuming processes involved?

1992 ◽  
Vol 1098 (2) ◽  
pp. 261-265 ◽  
Author(s):  
Marc Charland ◽  
Konka Veeranjaneyulu ◽  
Denis Charlebois ◽  
Roger M. Leblanc
Keyword(s):  
Photoacoustic Signal ◽  
Signal Generation

scholarly journals Exploiting Nonlinear Photoacoustic Signal Generation in Gold Nanospheres for Selective Detection in Serial 3D PA Tomography

2018 ◽  
Vol 4 (12) ◽  
pp. 146 ◽  
Author(s):  
Susanne Schrof ◽  
Genny Pang ◽  
Jens Buchmann ◽  
Jan Laufer
Keyword(s):  
Gold Nanoparticles ◽  
Spatial Distribution ◽  
Signal Amplitude ◽  
Photoacoustic Signal ◽  
Selective Detection ◽  
Gold Nanospheres ◽  
Robust Detection ◽  
Tissue Phantom ◽  
Gold Nanosphere ◽  
Background Contrast

The photoacoustic (PA) signal amplitude measured in gold nanosphere suspensions has been shown to increase nonlinearly with the incident excitation fluence. In this work, this effect is exploited to recover the spatial distribution of gold nanoparticles in tomographic 3D photoacoustic (PA) images against the background contrast provided by absorbers that exhibit a linear relationship between the PA signal amplitude and the fluence. Serial tomographic PA images of a tissue phantom containing gold nanospheres and a tissue-mimicking absorber were acquired. By assessing the linearity of the PA intensity voxel by voxel, the spatial distribution of the gold nanosphere suspension was recovered. The method is shown to enable the robust detection of gold nanoparticles.

scholarly journals Precipitation of Zinc Oxide Nanoparticles in Bicontinuous Microemulsions

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Liliana E. Romo ◽  
Hened Saade ◽  
Bertha Puente ◽  
Ma. Luisa López ◽  
Rebeca Betancourt ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Sodium Hydroxide ◽  
Zinc Oxide Nanoparticles ◽  
Sodium Dodecyl ◽  
Particle Diameter ◽  
Average Diameter ◽  
Zinc Nitrate ◽  
Oxide Nanoparticles ◽  
Sulfosuccinate Sodium

Zinc oxide nanoparticles were obtained directly, avoiding the calcination step, by precipitation at 70°C in bicontinuous microemulsions stabilized with a mixture of surfactants sodium bis (2-ethylhexyl) sulfosuccinate/sodium dodecyl sulfate (2/1, wt./wt.) containing 0.7 M zinc nitrate aqueous solution. Two concentrations of aqueous solution of precipitating agent sodium hydroxide were used under different dosing times on microemulsion. Characterization by X-ray diffraction and electron microscopy allowed us to identify particles with an acicular rod-like morphology and a hexagonalwurtzitecrystal structure as small as 8.5 and 30 nm in average diameter and length, respectively. Productivities much higher than those typical in the preparation of zinc oxide nanoparticles via reverse microemulsions were obtained. Particle size was the same at the two studied sodium hydroxide concentrations, while it increases as dosing time of the precipitant agent increases. It is believed that the surfactant film on the microemulsion channels restricts the particle diameter growth.

Dependence of photoacoustic signal generation on the transducer and source type

2014 ◽  
Author(s):  
C. A. Bravo-Miranda ◽  
A. González-Vega ◽  
G. Gutiérrez-Juárez
Keyword(s):  
Photoacoustic Signal ◽  
Signal Generation ◽  
Source Type

Graphene Oxide Wrapping of Gold-Silica Core-Shell Nanohybrids for Photoacoustic Signal Generation and Bimodal Imaging

ChemNanoMat ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Sivaramapanicker Sreejith ◽  
James Joseph ◽  
Kim Truc Nguyen ◽  
Vadakke Matham Murukeshan ◽  
Sun Woh Lye ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photoacoustic Signal ◽  
Signal Generation ◽  
Core Shell ◽  
Bimodal Imaging ◽  
Silica Core
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