Analysis of Ultrasonic Fields by Light Diffraction

1973 ◽  
Vol 51 (12) ◽  
pp. 1341-1349 ◽  
Author(s):  
J. Vrba ◽  
R. R. Haering
Keyword(s):  
Light Scattering ◽  
Ultrasonic Wave ◽  
Propagation Direction ◽  
Index Of Refraction ◽  
Light Diffraction ◽  
Strain Fields ◽  
Wave Fields ◽  
Ultrasonic Fields ◽  
The Relationship ◽  
Hexagonal Crystals

It is shown how the frequency, wavelength, intensity, and propagation direction of waves present in ultrasonic wave fields may be determined by light scattering experiments. The relationship between index of refraction variations and arbitrary strain fields is developed for hexagonal crystals and explicit results valid for CdS crystals are presented.

scholarly journals Enhancement of optical force acting on vesicles via the binding of gold nanoparticles

2019 ◽  
Vol 6 (5) ◽  
pp. 190293 ◽  
Author(s):  
Yumeki Tani ◽  
Takashi Kaneta
Keyword(s):  
Gold Nanoparticles ◽  
Light Scattering ◽  
Laser Beam ◽  
Binding Constant ◽  
Electrostatic Interactions ◽  
Propagation Direction ◽  
Optical Force ◽  
Surface Charges ◽  
Scattering Force ◽  
The Relationship

Here we found that gold nanoparticles (AuNPs) enhance the optical force acting on vesicles prepared from phospholipids via hydrophobic and electrostatic interactions. A laser beam was introduced into a cuvette filled with a suspension of vesicles and it accelerated them in its propagation direction via a scattering force. The addition of the AuNPs exponentially increased the velocity of the vesicles as their concentration increased, but polystyrene particles had no significant impact on velocity in the presence of AuNPs. To elucidate the mechanism of the increased velocity, the surface charges in the vesicles and the AuNPs were controlled; the surface charges of the vesicles were varied via the use of anionic, cationic and neutral phospholipids, whereas AuNPs with positive and negative charges were synthesized by coating with citrate ion and 4-dimethylaminopyridine, respectively. All vesicles increased the velocity at different degrees depending on the surface charge. The vesicles were accelerated more efficiently when their charges were opposite those of the AuNPs. These results suggested that hydrophobic and electrostatic interactions between the vesicles and the AuNPs enhanced the optical force. By accounting for the binding constant between the vesicles and the AuNPs, we proposed a model for the relationship between the concentration of the AuNPs and the velocity of the vesicles. Consequently, the increased velocity of the vesicles was attributed to the light scattering that was enhanced when AuNPs were adsorbed onto the vesicles.

Study of the Relationship between Fractal Surface's Roughness and Light Scattering

1998 ◽  
Vol 14 (07) ◽  
pp. 585-589
Author(s):  
Tang Xiao-Ming ◽  
◽  
Wei Sai-Zhen ◽  
Mao Zu-Sui ◽  
Chen Xiao-Feng ◽  
...  
Keyword(s):  
Light Scattering ◽  
The Relationship

Ultrasonic Nondestructive Evaluation of the Creep Damaged IN738LC Superalloy

2004 ◽  
Vol 449-452 ◽  
pp. 569-572 ◽  
Author(s):  
Jai Won Byeon ◽  
J.H. Song ◽  
S.I. Kwun
Keyword(s):  
Nondestructive Evaluation ◽  
Ultrasonic Wave ◽  
Linear Correlation ◽  
Ultrasonic Attenuation ◽  
Creep Damage ◽  
Ultrasonic Nondestructive Evaluation ◽  
Microstructural Parameters ◽  
Creep Time ◽  
The Mean ◽  
The Relationship

It was attempted to evaluate nondestructively the creep damaged IN738LC Ni based superalloys with different degree of rafting using ultrasonic wave. Microstructural parameters (length and width of γ' precipitates) and ultrasonic attenuation were measured in order to clarify the relationship between them. Both the mean length of γ' precipitates and the ultrasonic attenuation increased with creep time. Ultrasonic attenuation was found to have a linear correlation with the mean length of γ' precipitates. It is suggested that the ultrasonic attenuation can be used as a potential nondestructive parameter for assessing the degree of creep damage of IN738LC superalloy.

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