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Contact Angle

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetric Bending - Angle of Neutral Axis

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Surface Tension and Surface Energy

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Heterogeneous Catalysis

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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PDMMLA derivatives as a promising cardiovascular metallic stent coating: Physicochemical and biological evaluation.

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Related Experiment Video

Updated: Mar 15, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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Published on: April 10, 2017

Dynamic contact angle cycling homogenizes heterogeneous surfaces.

R Belibel¹, C Barbaud¹, L Mora¹

¹INSERM U1148, Laboratory for Vascular Translational Science (LVTS), Institut Galilée, Université Paris 13, Sorbonne Paris Cité, 99 Avenue Jean-Baptiste Clément, Villetaneuse F-93430, France.

Materials Science & Engineering. C, Materials for Biological Applications

|September 11, 2016

Summary

This summary is machine-generated.

Biodegradable polymer coatings for metallic stents were developed using poly((R,S)-3,3 dimethylmalic acid) (PDMMLA). Advancing contact angle and hysteresis measurements effectively characterize surface properties, crucial for drug-eluting stent development.

Keywords:

Biodegradable (poly((R,S)-3,3 dimethylmalic acid)) derivatives Biopolyesters Contact angle Heterogeneous surfaces Hydrophobicity Sessile drop Wilhelmy balance

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Area of Science:

Biomaterials Science
Polymer Chemistry
Surface Science

Background:

Reducing restenosis after metallic stent implantation necessitates advanced coating materials.
Biodegradable polymers offer potential for drug delivery and improved biocompatibility in cardiovascular devices.

Purpose of the Study:

To synthesize and characterize biodegradable poly((R,S)-3,3 dimethylmalic acid) (PDMMLA) copolymers for stent coatings.
To investigate the influence of surface chemistry, specifically acidic and hexylic groups, on the wettability and dynamic surface properties of these PDMMLA coatings.
To evaluate the effectiveness of Dynamic Surface Analysis compared to Cassie theory for characterizing heterogeneous polymer surfaces.

Main Methods:

Synthesis of PDMMLA copolymers with varying percentages of acidic groups.
Measurement of advancing and receding contact angles and surface hysteresis.
Application of Dynamic Surface Analysis through repeated cycling in water.
Comparison of experimental results with theoretical predictions from Cassie theory.

Main Results:

Advancing contact angle linearly decreases with increasing acidic group percentage (%A) in PDMMLA side chains.
Surface hysteresis (H) was identified as a sensitive parameter to %A.
Dynamic Surface Analysis, particularly after cycling (H(10)), provided reliable surface characterization, superseding theoretical Cassie corrections for heterogeneous surfaces.

Conclusions:

PDMMLA copolymers are promising candidates for drug-carrying stent coatings due to tunable surface properties.
Dynamic Surface Analysis is a practical and effective method for characterizing the heterogeneous surfaces of these advanced biomaterials.
Surface wettability and hydrolysis kinetics are significantly influenced by the chemical composition and dynamic surface behavior of the polymer coating.