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Updated: Apr 30, 2026
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In Situ Characterization of Hydrated Proteins in Water by SALVI and ToF-SIMS
Published on: February 15, 2016
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In Situ Characterization of the Hydration Structure at the Silica-Water Interface.
Zhaoyang Sun1, Jile Jiang2, Jingyang Li1
1State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 29, 2026
Summary
Researchers quantitatively linked interfacial forces to water structure at silica surfaces. Repulsive forces correlate with expanded hydration layers, while attractive forces lead to more compact structures, revealing key insights into hydration forces.
Area of Science:
- Surface Science and Physical Chemistry
- Colloid and Interface Science
Background:
- Understanding interfacial water structure is crucial for surface forces, colloidal stability, and transport.
- Quantitative links between interfacial forces and hydration layer formation, especially with electrolytes, are incomplete.
Purpose of the Study:
- To quantitatively correlate interfacial forces with hydration structure evolution at silica-water interfaces.
- To investigate the impact of electrolyte concentration on hydration layer structure and interfacial forces.
Main Methods:
- Combined colloidal-probe atomic force microscopy (AFM) and three-dimensional AFM.
- Simultaneous characterization of interfacial forces and hydration structures on silica surfaces.
- Experiments conducted in pure water and varying NaCl concentrations.
Main Results:
- Observed a transition from a bilayer to a more compact trilayer hydration structure with increasing ionic strength.
- Force measurements showed nonmonotonic evolution of effective interaction with ionic strength.
- Established a quantitative correlation: repulsive forces linked to expanded hydration layers, attractive forces to reduced thickness.
Conclusions:
- Surface silanol groups are key in stabilizing compact hydration structures across ionic strengths.
- Provided a quantitative link between interfacial forces and hydration layer organization at silica-water interfaces.
- Enhanced understanding of hydration forces in aqueous systems.
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