Bio-Inspired Lotus-Fiber-like Spiral Hydrogel Bacterial Cellulose Fibers

Guan, Qing‐Fang; Han, Zhi‐Yong; Zhu, YinBo; Xu, Wenlong; Yang, Huai‐Bin; Ling, Zhang‐Chi; Yan, Beibei; Yang, Kunpeng; Yin, Chong‐Han; Wu, Huan; Yu, Shu‐Hong

doi:10.1021/acs.nanolett.0c03707

Cited by 126 publications

(83 citation statements)

References 32 publications

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“…XPS and FTIR analysis were used to verify the chemical crosslinking reaction of the CTS aerogels. In the XPS spectrum ( Figure 1 ), the peaks detected at binding energies of 284.5 (C 1s), 286.1 (C 1s), 399.7 (N 1s), and 532.2 (O 1s) represented CPNAs generated by C–N, C=N, N–C–N, and C–O–C, respectively [ 34 ]. XPS found no significant difference between the binding energy of the elements in the CPAs, CPNAs-37.5, and CPNAs-50.0, which indicated that the main chemical reaction in the CPNAs was the Maillard reaction, whether NFC was added or not.…”

Section: Resultsmentioning

confidence: 99%

Chitosan Based Aerogels with Low Shrinkage by Chemical Cross-Linking and Supramolecular Interaction

Zhang

Xiao

et al. 2022

Gels

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Chitosan (CTS) aerogel is a new type of functional material that could be possibly applied in the thermal insulation field, especially in energy-saving buildings. However, the inhibition method for the very big shrinkage of CTS aerogels from the final gel to the aerogel is challenging, causing great difficulty in achieving a near-net shape of CTS aerogels. Here, this study explored a facile strategy for restraining CTS-based aerogels’ inherent shrinkage depending on the chemical crosslinking and the interpenetrated supramolecular interaction by introducing nanofibrillar cellulose (NFC) and polyvinyl alcohol (PVA) chains. The effects of different aspect ratios of NFC on the CTS-based aerogels were systematically analyzed. The results showed that the optimal aspect ratio for NFC introduction was 37.5 from the comprehensive property perspective. CTS/PVA/NFC hybrid aerogels with the aspect ratio of 37.5 for NFC gained a superior thermal conductivity of 0.0224 W/m K at ambient atmosphere (the cold surface temperature was only 33.46 °C, despite contacting the hot surface of 80.46 °C), a low density of 0.09 g/cm3, and a relatively high compressive stress of 0.51 MPa at 10% strain.

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Section: Resultsmentioning

confidence: 99%

Chitosan Based Aerogels with Low Shrinkage by Chemical Cross-Linking and Supramolecular Interaction

Zhang

Xiao

et al. 2022

Gels

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“…The stress–strain curves of both threads (Figure 6bi) show, typical elastic behaviors with maximum stresses of 80 and 260 MPa; these are comparable to those of 5‐0 and 4‐0 cotton sutures, respectively. [ 33–35 ] In most surgical stitching‐up processes, the suture needle is thicker than the suture line; thus, the suture can move in the needle hole passage, potentially causing additional tissue damage. To tackle this problem, a suture line that swells in the tissue and adapts to the channel as a seamless suture is desirable.…”

Section: Resultsmentioning

confidence: 99%

COCu: A Robust Self‐Regenerative Hydrogel with Applicability as Both Hydrated Gel Dressing and Dry Suture for Seamless Tissue Fixation and Repair

Chan

Lin

et al. 2022

Adv Healthcare Materials

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Self-regenerative hydrogels have recently been developed, and represent a special type of self-healing hydrogels with the ability to restore a dehydrated hydrogel with physical damage. In this study, a self-regenerative hydrogel (COCu) based on two chitosan polymers assembled by slow-released Cu 2+ is developed. The COCu hydrogel displays an excellent regeneration ability after being dehydrated and fractured. By simple hydration at room temperature, the fragments of the dehydrated gel fuse into one seamless whole, thereby preserving the mechanical properties and functionalities of the original hydrogel. The regeneration process can be conducted repeatedly after different methods of dehydration (natural volatilization, heat drying, lyophilization) and various modes of deconstruction (flakes, powder, lumpy sponge, etc.). Furthermore, the COCu hydrogel provides ultra-stretchability, and it can be stretched into thin (0.01-0.1 mm) filaments, which, when dried (dtCOCu), can be used as suture lines. Moreover, when used as a dry suture, it regenerates into the hydrogel in the presence of the tissue fluid, forming an excellent sealant to immobilize tissues and seamlessly seal wounds. The fast self-regeneration allows for its facile application as both a hydrated gel dressing and dry suture, and offers customized strategies for fixing and repair of different wounds in soft tissues.

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“…First, bio‐inspired and biomimetic materials have recently emerged in multiple medical applications, offering diverse advantages non‐presented in traditional materials. Most excellent inventions mimic a biological species, [ 13 ] organ structure, [ 14 ] or physical characteristics, [ 15 ] while our approach moves a step further to mirror a specific pathological process mediated by a particular type of molecules. Its clear biological mechanism at the molecular level is essential for understanding the therapeutic outcomes and in turn adjusting the materials design.…”

Section: Resultsmentioning

confidence: 99%

A “Bridge‐Building” Glycan Scaffold Mimicking Microbial Invasion for In Situ Endothelialization

Zhang

Yan

et al. 2021

Advanced Materials

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The globally high prevalence of peripheral artery diseases poses a pressing need for biomaterials grafts to rebuild vasculature. When implanted, they should promote endothelial cells (ECs) adhesion both profoundly and selectively—but the latter expectation remains unfulfilled. Here, this work is inspired by fungi that invade blood vessels via the “bridge” of galectins that, secreted by ECs, can simultaneously bind carbohydrates on fungal surface and integrin receptors on ECs. A glucomannan decanoate (GMDE) substrate mimicking fungal carbohydrates that highly and preferentially supports ECs adhesion while rejecting several other cell types is designed. Electrospun GMDE scaffolds efficiently sequester endogenous galectin‐1—which bridges ECs to the scaffolds as it functions in fungal invasions—and promote blood perfusion in a murine limb ischemic model. Meanwhile, the application of GMDE requires no exogenous pro‐angiogenic agents and causes no organ toxicity or adverse inflammation in mice, highlighting its high safety of potential translation. This glycan material, uniquely mimicking a microbial action and harnessing a secreted protein as a “bridge,” represents an effective, safe, and different strategy for ischemic vascular therapy.

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Bio-Inspired Lotus-Fiber-like Spiral Hydrogel Bacterial Cellulose Fibers

Cited by 126 publications

References 32 publications

Chitosan Based Aerogels with Low Shrinkage by Chemical Cross-Linking and Supramolecular Interaction

Chitosan Based Aerogels with Low Shrinkage by Chemical Cross-Linking and Supramolecular Interaction

COCu: A Robust Self‐Regenerative Hydrogel with Applicability as Both Hydrated Gel Dressing and Dry Suture for Seamless Tissue Fixation and Repair

A “Bridge‐Building” Glycan Scaffold Mimicking Microbial Invasion for In Situ Endothelialization

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