In Situ Self-Assembly of Nanoparticles into Waxberry-Like Starch Microspheres Enhanced the Mechanical Strength, Fatigue Resistance, and Adhesiveness of Hydrogels
| Autor: | Zhengyu Jin, Shengju Ge, Yao Hu, Chao Qiu, Yang Qin, Jinpeng Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Vinyl alcohol
Materials science Starch Surface Properties Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Nanocomposites chemistry.chemical_compound General Materials Science Particle Size Self-assembly of nanoparticles Waxy corn Nanocomposite biology Hydrogels 021001 nanoscience & nanotechnology biology.organism_classification Microspheres 0104 chemical sciences Compressive strength chemistry Chemical engineering Self-healing hydrogels Stress Mechanical 0210 nano-technology |
| Zdroj: | ACS applied materialsinterfaces. 12(41) |
| ISSN: | 1944-8252 |
| Popis: | Owing to the diminishing resources and growing awareness of environmental issues, significant scientific attention has been paid to the development of physical gel materials using renewable and low-cost natural resources. Inspired by the strengthened mechanism of double-network and nanocomposite (NC) gels, we report a facile and green method to realize a mechanically stiff, fatigue-resistant, and adhesive-debranched waxy corn starch/poly(vinyl alcohol) double-crosslinked NC gel (W-Gel) skeleton material with dynamic noncovalent bonds. The in situ formation of debranched starch nanoparticles leads to self-assembly into three-dimensional waxberry-like microspheres, which act as physical cross-linkers by embedding themselves within network skeleton structures. The resulting hydrogel exhibited an excellent mechanical behavior, including a good stretchability over 1200% strain, a maximum compressive strength of up to 780.7 ± 27.8 kPa, and the ability to sustain as much weight as 4.6 kg (about 2000 times its own weight). Notably, the recovery efficiency exceeded 93% after the 60th compressive successive loading-unloading cycle at 50% strain. The hydrogel successfully adhered onto soft and hard substrates, such as skins, plastics, gauzes, glasses, and metals, manifesting in long-term, stable, sustained release of epigallocatechin gallate (EGCG). The EGCG-loaded W-Gels exhibited predominant antibacterial activity against both Gram-positive bacteria (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli and Salmonella typhus). |
| Databáze: | OpenAIRE |
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