High strength graphene oxide/chitosan composite screws with a steel-concrete structure

Jin, Xiaoqiang; Li, Guoqi; Jiang, Huihong; Zhou, Yi; Zhang, Wenkan; Bao, Xiaojiong; Wang, Zhengke; Hu, Qiaoling

doi:10.1016/j.carbpol.2019.03.039

Cited by 9 publications

(1 citation statement)

References 32 publications

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“…After that, many new high strength CS composite materials were constructed. For instance, oriented CS nanofibers for guiding cell growth, 14 the CS/HNTs composite hydrogels, 15 graphene oxide/CS composite screws with a steel‐concrete structure, 16 CS/Carrageenan hydrogels constructed through an electroneutrality system, 17 CS/Polyaniline self‐wrinkling hydrogel. 18 …”

Section: Introductionmentioning

confidence: 99%

High strength antibacterial membranes consisted of nanofibrous chitosan immobilized silver nanoparticles

Chen

Yuan

et al. 2021

J of Applied Polymer Sci

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Chitosan (CS) has biocompatibility and biodegradability, but the bulk CS hydrogel/membranes with its poor strength and limited antibacterial property could not satisfy the practical application. Here green dissolving/regeneration and in situ reduction strategy was combined to construct high strength antibacterial CS membranes. First nanofibrous CS hydrogels were constructed through dissolving CS in LiOH/KOH/urea aqueous system via freezing–thawing process followed regeneration. Then, Ag NPs were immobilized along CS nanofibers through in situ reductions of Ag + by the NH2 group of CS. The obtained NCM‐Ag composite dry membranes are easy for storing and can quick switch to nanofibrous hydrogels as absorbing water. Size of Ag NPs can be controlled to very small until 2 nm by concentration and limited space network. Fourier transform infrared spectroscopy and X‐ray photoelectron spectrometer indicated the forceful grasp ability of CS nanofibers to Ag NPs for a stable binding, mechanical property was enhanced over 100Mpa as the nanofibrous structure and chain linked by Ag coordination. The NCM‐Ag membranes had excellent antibacterial activities against both Staphylococcus aureus and Escherichia coli. Moreover, such nanofibrous CS membrane exhibited good adhesive ability to tissues. Combining all these properties, NCM‐Ag membranes would be potential as antibacterial adhesion barrier to accelerate wound healing.

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Section: Introductionmentioning

confidence: 99%

High strength antibacterial membranes consisted of nanofibrous chitosan immobilized silver nanoparticles

Chen

Yuan

et al. 2021

J of Applied Polymer Sci

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Fabrication of alginate‐P(SBMA‐co‐AAm) hydrogels with ultrastretchability, strain sensitivity, self‐adhesiveness, biocompatibility, and self‐cleaning function for strain sensors

Jin

Jiang

Qiao

et al. 2020

J of Applied Polymer Sci

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Conductive hydrogels have attracted a myriad of interest due to their potential applications for human motion monitoring, personal healthcare diagnosis and so forth. However, fabrication of hydrogel-based strain sensors integrating with ultrastretchability, adhesiveness, strain sensitivity, biocompatibility, and self-cleaning function is still a challenge. Herein, a new type of semiinterpenetrating multifunctional hydrogels, which integrated all above practical features magically were prepared via a facile one-pot in-situ radical copolymerization method. Thereinto, [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide (SBMA) and acrylamide (AAm) copolymers cross-linked by N,N 0-Methylenebisacrylamide (MBAA) served as the soft and functional matrix, whereas alginate was employed as the enhanced component. The transparent zwitterionic hydrogels had a max elongation and ionic conductivity of 1353% and 0.15 S/m, respectively. They could adhere onto various surfaces, including steel, glass, skin, and rubber. The repeatable adhesiveness, linear strain sensitivity within 0%-250% tensile strain and 0%-30% compressive strain provided remarkable working range and using stability. What's more notable was that the biocompatibility and self-cleaning function tested by MTT, live/ dead assay, allergy patch tests, and plate colony-counting method imparted great possibility of practical application for strain sensors to hydrogels from a biological point of view.

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The impact of using natural waste biopolymer cement on the properties of traditional/fibrous concrete

Yehia,

Ibrahim,

Ahmed

2023

Innov. Infrastruct. Solut.

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The naturally occurring wastes contain a large number of active groups. In this study, shrimp shell wastes were modified chemically to form chitosan. When mixing concrete with a natural polymer the result revealed a synergistic impact on the characteristics and functionality of the concrete structure. The formed chitosan was characterized by Fourier-Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). Five concrete mixes were designed to achieve the study objective. For certain concrete mixes, admixtures such as a natural polymer (chitosan), and chemical (superplasticizer) were added with 0.05% by weight of the cement content. Those admixtures were added to study their behavior on the characteristics of the concrete mixes, and then compare test results with control concrete mixes. Also, the purpose of the experiment was expanded to study the impact of adding the admixtures to fibrous concrete, as this fibrous concrete faces interlocking due to steel fiber's presence in the fresh concrete mixture. The results indicated that concrete-embedded chitosan exhibited significant enhancement in the mechanical properties. Further, the surface shape of concrete was characterized by the presence of chitosan crystallites which spread and filled the spaces in the chitosan structure. Also, it’s noted that chitosan can delay the rate of cement hydration to a small value, which may help in hot weathering concrete.

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High strength graphene oxide/chitosan composite screws with a steel-concrete structure

Cited by 9 publications

References 32 publications

High strength antibacterial membranes consisted of nanofibrous chitosan immobilized silver nanoparticles

High strength antibacterial membranes consisted of nanofibrous chitosan immobilized silver nanoparticles

Fabrication of alginate‐P(SBMA‐co‐AAm) hydrogels with ultrastretchability, strain sensitivity, self‐adhesiveness, biocompatibility, and self‐cleaning function for strain sensors

The impact of using natural waste biopolymer cement on the properties of traditional/fibrous concrete

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