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Engineering macroporous composite materials using competitive adsorption in particle-stabilized foams.

Joanna C H Wong¹, Elena Tervoort, Stephan Busato

¹Centre of Structure Technologies, Department of Mechanical and Process Engineering, ETH Zurich, Leonharstrasse 27, CH-8092 Zurich, Switzerland. joanna.wong@empa.ch

Journal of Colloid and Interface Science

|July 17, 2012

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Particle-stabilized foams enable macroporous composite creation. Controlling poly(vinylidene fluoride) and alumina particle distribution at foam interfaces allows tailored phase distribution in advanced materials.

Area of Science:

Materials Science
Colloid and Surface Chemistry

Background:

Partially wetted particles at fluid interfaces exhibit high absorption energies.
These properties facilitate the production of macroporous composite materials from particle-stabilized foams.

Purpose of the Study:

To investigate the effects of poly(vinylidene fluoride) (PVDF) and alumina (Al(2)O(3)) particle adsorption on macroporous composite materials.
To demonstrate control over phase distribution in engineered porous composites by managing particle competition at foam interfaces.

Main Methods:

Utilizing particle-stabilized foams as a template for composite material fabrication.
Analyzing the preferential and competitive adsorption of PVDF and Al(2)O(3) particles at foam interfaces.
Varying the relative composition and surface energies of stabilizing particles.

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Main Results:

Demonstrated that particle competition at foam interfaces dictates their distribution within the foam lamella.
Showcased the ability to control the phase distribution within the resulting macroporous composite materials.
Achieved a broad range of phase distributions in macroporous composites by adjusting particle composition and surface energies.

Conclusions:

The controlled adsorption of different particle types at fluid interfaces is key to engineering the structure of macroporous composites.
This technique offers a versatile method for designing and fabricating advanced porous materials with tunable properties.