Biomimetic Engineering of a Fortified Ice Composite with Enhanced Mechanical Properties

TL;DR

This paper introduces BioPykrete, a bio-composite made of ice, CNC, and a custom chimera protein, which exhibits enhanced mechanical properties and elasticity, suitable for sustainable construction in harsh environments.

Contribution

The development of a novel bio-composite with a custom-designed chimera protein that improves ice-based materials' strength and elasticity for engineering applications.

Findings

BioPykrete has compressive strength comparable to concrete.

It exhibits an elastic-like response to stress.

The material is sustainable and biodegradable.

Abstract

This work presents BioPykrete, a new sustainable bio-composite material created from ice, nano-crystalline cellulose (CNC), and a tailor-made chimera protein designed to bind the two together. We developed and produced the chimera protein by linking AFPIII, an ice-binding protein, with CBM3a, a CNC-binding protein. As the suspension freezes, the CNC chains self-organize into a reinforcing network between the ice crystals. This structural enhancement limits crack propagation to typical pore sizes, allowing BioPykrete to avoid the brittle and sudden failure commonly associated with ice. Instead, it exhibits an elastic-like response to stress, making it suitable for construction and engineering applications. With compressive strength comparable with concrete, BioPykrete offers a sustainable and biodegradable alternative to construction materials suitable for the harsh arctic regions of the world where traditional methods are ineffective, and resources are scarce. Engineering chimera proteins with specific affinity to more than a single material type may help improve or tailor the properties of other composite materials.