Controlling the Assembly of Cellulose-Based Oligosaccharides through Sequence Modifications.

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Carbohydrate Chemistry

Background:

• Programmable peptides and nucleic acids are key for developing tunable, self-assembling functional materials.
• Oligosaccharides offer a promising, yet less explored, avenue for creating such advanced materials.

Purpose of the Study:

• To demonstrate that oligosaccharide primary sequences can be designed to produce materials with tunable shapes and properties.
• To explore the structure-property relationships of synthetic cellulose-based oligomers.

Main Methods:

• Synthesis of cellulose-based oligomers with specific sequences.
• Assembly of these oligomers into ordered structures (2D or 3D crystallites).
• Analysis of how sequence modifications affect molecular packing, crystallite morphology, and bulk material properties.

Main Results:

• Synthetic cellulose oligomers self-assembled into 2D or 3D rod-like crystallites.
• Modifications in the oligosaccharide core led to square-like assemblies of the cellulose IV_II allomorph.
• Terminal sequence modifications resulted in elongated aggregates with tunable surfaces, forming self-healing supramolecular hydrogels.

Conclusions:

• The primary sequence of oligosaccharides is a critical design element for controlling the self-assembly and properties of functional materials.
• Oligosaccharide-based materials offer a versatile platform for creating structures ranging from crystalline assemblies to self-healing hydrogels.