Nanobubble Skin Supersolidity.
Xi Zhang1, Xinjuan Liu2, Yuan Zhong3
1Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, Institute of Nanosurface Science and Engineering, Shenzhen University , Shenzhen 518060, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 6, 2016
Summary
Water nanobubbles exhibit enhanced mechanical strength and thermal stability due to their supersolid skin. This unique property, stemming from molecular undercoordination, influences their behavior in various industrial applications.
Area of Science:
- Physical Chemistry
- Materials Science
- Nanotechnology
Background:
- Water nanobubbles display superior mechanical strength, thermal stability, and longevity compared to macroscopic bubbles.
- Understanding the underlying mechanisms of these unique nanobubble properties remains a significant scientific challenge.
Purpose of the Study:
- To investigate the molecular mechanisms behind the enhanced properties of water nanobubbles.
- To elucidate the role of molecular undercoordination in the nanobubble skin's behavior.
Main Methods:
- Quantum computations were employed to predict nanobubble properties.
- Raman spectrometric measurements were utilized to validate theoretical predictions.
Main Results:
- The nanobubble skin exhibits supersolidity, similar to molecular clusters and water droplets, due to molecular undercoordination.
- Molecular undercoordination alters hydrogen bond characteristics, affecting molecular dynamics, viscosity, and thermal properties.
- Specifically, it leads to shorter/longer H-O/O:H bonds, modified phonon frequencies, and altered freezing/melting points.
Conclusions:
- The supersolid skin of water nanobubbles is responsible for their increased thermal stability, reduced density, and enhanced stiffness.
- The unique properties of nanobubbles are directly linked to the slowed molecular dynamics within their skins.
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