Surface Tension Relaxation of Poly(N-isopropylacrylamide) at the Air/Water Solution Interface As Probed by Surface Laser Light Scattering

Langmuir ◽  
1999 ◽  
Vol 15 (2) ◽  
pp. 634-637 ◽  
Author(s):  
Q. R. Huang ◽  
C. H. Wang
Keyword(s):  
Surface Tension ◽  
Light Scattering ◽  
Laser Light ◽  
Water Solution ◽  
Laser Light Scattering ◽  
Solution Interface ◽  
Surface Laser

Sensing Changes of Surface Properties of Oxygen Nano-Bubbles in Water by the Ripplon Surface Laser-Light Scattering

2011 ◽  
Author(s):  
Yuma Ichikawa ◽  
Yu Nishimura ◽  
Yuji Nagasaka
Keyword(s):  
Surface Tension ◽  
Light Scattering ◽  
Surface Properties ◽  
Water Surface ◽  
Laser Light ◽  
Laser Light Scattering ◽  
Ultrapure Water ◽  
Present Measurement ◽  
Closed Container ◽  
Surface Laser

Micro and nano-sized bubbles containing in water have been attracting increasing attention from wide variety of research fields because of their remarkable bioactive effects. Although many application studies have been conducted, the fundamental understanding such as existence and stability of especially nano-bubbles in water is still unsatisfactory. The purpose of the present study is to detect the changes of surface properties (surface tension and viscosity) of nano-bubbles in water by the newly developed ripplon surface laser-light scattering apparatus. The present measurement technique is able to detect nanometer-order-amplitude surface wave usually regarded as ripplons excited by thermal fluctuations. Because of this technique’s nanometer-order sensitivity to surface properties, the present apparatus has the potential to detect the possible presence of nano-bubbles in the vicinity of water surface. We have observed temporal change of surface tension and viscosity of ultrapure water containing oxygen nano-bubbles in a closed container by the ripplon surface laser-light scattering apparatus for 2 weeks. When the bubbles was generated for at least 90 minutes by using a micro and nano bubble generator, the apparent surface tension and viscosity of ultrapure water containing oxygen nano-bubbles was decreased up to about 23% and was increased up to about 270% relative to those of reference water, respectively. It can be speculated from the present experimental evidence that the nano-bubbles are existing in the vicinity of water surface in a closed container.

scholarly journals Surface tension and viscosity measurement with surface laser light scattering method

2013 ◽  
Vol 17 (5) ◽  
pp. 1467-1471 ◽  
Author(s):  
Feng-Kun Wang ◽  
Hong-Ya Yue ◽  
Xiao-Wei Fan ◽  
Zhi-Gang Liu
Keyword(s):  
Surface Tension ◽  
Thermal Properties ◽  
Light Scattering ◽  
Laser Light ◽  
Experimental System ◽  
Laser Light Scattering ◽  
Heterodyne Detection ◽  
Scattering Method ◽  
Surface Laser ◽  
Experimental Errors

Measurement of thermal properties is an important topic in the thermophysics. With the developing of laser technology, laser detection technologies can be used for thermal properties measurement. Based on the laser light scattering theory and light heterodyne detection principle, an experimental system by the surface laser light scattering is developed to measure the liquid surface tension and viscosity simultaneously. The maximal experimental errors of the measured surface tension and viscosity are less than 0.5% and 4.73%, respectively.

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