Bioinspired Flexible and Tough Layered Peptide Crystals

Area of Science:

• Materials Science
• Nanotechnology
• Biomimetic Materials

Background:

• Achieving a combination of flexibility, strength, and toughness in functional materials is a significant challenge.
• Hierarchical architectures and anisotropy, seen in natural materials like bone and nacre, are key to obtaining these mechanical properties.

Purpose of the Study:

• To investigate the mechanical properties of N-capped diphenylalanine crystals.
• To understand the structural basis for the observed flexibility in these self-assembled crystals.

Main Methods:

• Mechanical property evaluation of individual N-capped diphenylalanine crystals.
• Density functional theory calculations to assist in understanding flexibility.
• High-resolution scanning electron microscopy to analyze crystal structure.

Main Results:

• N-capped diphenylalanine crystals exhibit well-ordered packing and sub-Å diffraction.
• These crystals demonstrate exceptional flexibility despite their ordered structure.
• Microscopy revealed layered self-assembled structures within the crystals.

Conclusions:

• The unique combination of strength, toughness, and flexibility arises from weak interactions between rigid layers.
• These crystals represent a new class of self-assembled layered materials.
• Potential applications exist in technology where contradictory mechanical properties are needed.