Self-assembled dynamic 3D fingerprints in liquid-crystal coatings towards controllable friction and adhesion

Research output: Contribution to journalArticleAcademicpeer-review

76 Citations (Scopus)

Abstract

Chiral‐nematic polymer network coatings form a “fingerprint” texture through self‐assembly. For this purpose the molecular helix of the coating is oriented parallel to the substrate. The coating has a flat surface but when actuated by light in the presence of a copolymerized azobenzene compound, 3D fingerprint structures appear in the coating. The helix forms protrusions at the positions where the molecules are aligned parallel to the surface and withdraws at the positions where the orientation is perpendicular. This process proceeds rapidly and is reversible, that is, the fingerprint‐shaped protrusions disappear when the light is switched off. The texture in the on‐state resembles that of a human fingerprint and is used to manipulate the gripping friction of a robotic finger. The friction coefficient drops by a factor of four to five when the fingerprint switched on because of reduced surface contacts.
LanguageEnglish
Pages4542-4546
Number of pages5
JournalAngewandte Chemie - International Edition
Volume53
Issue number18
DOIs
StatePublished - 2014

Fingerprint

Liquid Crystals
Liquid crystals
Adhesion
Friction
Coatings
Textures
Azobenzene
Self assembly
Polymers
Robotics
Molecules
Substrates

Cite this

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title = "Self-assembled dynamic 3D fingerprints in liquid-crystal coatings towards controllable friction and adhesion",
abstract = "Chiral‐nematic polymer network coatings form a “fingerprint” texture through self‐assembly. For this purpose the molecular helix of the coating is oriented parallel to the substrate. The coating has a flat surface but when actuated by light in the presence of a copolymerized azobenzene compound, 3D fingerprint structures appear in the coating. The helix forms protrusions at the positions where the molecules are aligned parallel to the surface and withdraws at the positions where the orientation is perpendicular. This process proceeds rapidly and is reversible, that is, the fingerprint‐shaped protrusions disappear when the light is switched off. The texture in the on‐state resembles that of a human fingerprint and is used to manipulate the gripping friction of a robotic finger. The friction coefficient drops by a factor of four to five when the fingerprint switched on because of reduced surface contacts.",
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Self-assembled dynamic 3D fingerprints in liquid-crystal coatings towards controllable friction and adhesion. / Liu, D.; Broer, D.J.

In: Angewandte Chemie - International Edition, Vol. 53, No. 18, 2014, p. 4542-4546.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - Chiral‐nematic polymer network coatings form a “fingerprint” texture through self‐assembly. For this purpose the molecular helix of the coating is oriented parallel to the substrate. The coating has a flat surface but when actuated by light in the presence of a copolymerized azobenzene compound, 3D fingerprint structures appear in the coating. The helix forms protrusions at the positions where the molecules are aligned parallel to the surface and withdraws at the positions where the orientation is perpendicular. This process proceeds rapidly and is reversible, that is, the fingerprint‐shaped protrusions disappear when the light is switched off. The texture in the on‐state resembles that of a human fingerprint and is used to manipulate the gripping friction of a robotic finger. The friction coefficient drops by a factor of four to five when the fingerprint switched on because of reduced surface contacts.

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