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Microwrinkles: shape-tunability and applications.

Takuya Ohzono¹, Hirosato Monobe

¹Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8565, Japan. ohzono-takuya@aist.go.jp

Journal of Colloid and Interface Science

|December 27, 2011

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Shape-tunable microwrinkles on soft substrates offer dynamic control over liquid manipulation and liquid crystal alignment. This breakthrough enables novel applications by altering physical boundary conditions through macroscopic strain.

Area of Science:

Materials Science
Soft Matter Physics
Surface Engineering

Background:

Spontaneously formed microwrinkle patterns on elastomer surfaces are fabricated via compressive strain.
Microwrinkles find applications in cell patterning, optical devices, and surface property modification.
Controlling microwrinkle structure is challenging on hard substrates like silicon wafers.

Purpose of the Study:

To investigate the dynamic shape-tunability of microwrinkle patterns on soft substrates.
To explore applications of shape-tunable microwrinkles in liquid manipulation and liquid crystal alignment.
To demonstrate novel control over material states using tunable physical boundary conditions.

Main Methods:

Fabrication of microwrinkle patterns on soft substrates with a hard coating.

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Application of uniaxial or isotropic compressive strain to control microwrinkle periodicity and orientation.

Utilizing tunable microwrinkle microgrooves for capillary-driven liquid manipulation.

Investigating nematic liquid crystal alignment on shape-tunable microwrinkle surfaces.

Main Results:

Achieved dynamic shape-tunability of microwrinkle patterns by exerting additional strain on soft substrates.
Demonstrated controlled liquid manipulation, including droplet division, using tunable microgroove depth and direction.
Showcased repeatable switching of nematic liquid crystal alignment using shape-tunable microwrinkles.
Confirmed that tunable microwrinkles act as dynamic physical boundary conditions.

Conclusions:

Shape-tunable microwrinkles offer a novel method for controlling liquid behavior and aligning liquid crystals.
The ability to switch states via macroscopic strain control opens new avenues for responsive materials and devices.
This approach provides a versatile platform for exploring new phenomena and technologies based on tunable boundaries.