Spontaneous Formation of a Sustainable Antifreeze Coating by Peptide Self-Assembly
Michaela Kaganovich, Eilam Gibeon, Anna Shilling Bakalinsky, Deborah E. Shalev, Ido Braslavsky, Meital Reches
TL;DR
Researchers created a sustainable antifreeze coating using self-assembling peptides inspired by natural proteins, showing promise for preventing ice formation in various applications.
Contribution
A novel peptide design combining antifreeze and adhesion properties from natural proteins to form a sustainable antifreeze coating.
Findings
Surfaces coated with AFPep1 delayed initial freezing by 5 °C compared to bare surfaces.
AFPep1 inhibited ice recrystallization at 0.5 ± 0.1 mM concentration.
AFPep1 shaped ice crystals into hexagonal plates and inhibited ice growth at supercooling levels up to 0.04 °C.
Abstract
The formation of ice and frost on surfaces poses significant challenges to aviation, crop protection, organ preservation, and other fields. This paper presents the formation of sustainable antifreeze coating by the self-assembly of short peptides. The peptide design is inspired by and combines different elements from distinct natural proteins: (i) a sequence of amino acids from an antifreeze protein and (ii) the amino acids 3,4-dihydroxyphenylalanine (DOPA) and lysine from mussel adhesion proteins that anchor the peptide to a surface. The peptide, termed AFPep1, incorporates the repetitive ice-binding motif found in the antifreeze protein of the longhorn beetle (Rhagium inquisitor). Surfaces coated with the peptide exhibited antifreeze activity with a delay of the initial freezing of 5 °C degrees compared to a bare surface. Furthermore, AFPep1 exhibited relatively effective ice…
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Taxonomy
TopicsSurface Modification and Superhydrophobicity · nanoparticles nucleation surface interactions · Molecular Junctions and Nanostructures