Role of acid treatment combined with the use of urea in forming cellulose hydrogel

Yang, Fei; He, Weijian; Li, Hongwei; Zhang, Xiao; Feng, Yucheng

doi:10.1016/j.carbpol.2019.115059

Cited by 11 publications

(6 citation statements)

References 36 publications

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“…Type IV isotherms are given by mesoporous adsorbents such as many oxide gels. The adsorption behavior in mesoporous pores depends on the adsorbent–adsorptive interactions as well as the interactions between the molecules in the condensed state . At lower relative pressure (P/P 0 ), the adsorption capacity of AA/BC-3 and AA/BC-7 increased more rapidly.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption behavior in mesoporous pores depends on the adsorbent−adsorptive interactions as well as the interactions between the molecules in the condensed state. 29 At lower relative pressure (P/P 0 ), the adsorption capacity of AA/BC-3 and AA/BC-7 increased more rapidly. The results showed that AA/BC-3 and AA/BC-7 were mostly macroporous structures, with a few micropores and mesopores.…”

Section: 2mentioning

confidence: 96%

“…In addition, some nitrogen oxides were produced during plasma discharge, 28 which would dissolve and produce H + . Yang 29 et al obtained cellulose hydrogels with excellent swelling properties by combining acid treatment with an alkali/urea medium. In view of this, the H + reacted with the alkali−urea inclusion compound enclosing cellulose, resulting in exposed cellulose chains.…”

Section: Mechanism Of Double Cross-linked Hydrogelsmentioning

confidence: 99%

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Novel Double Cross-Linked Acrylic Acid/Bagasse Cellulose Porous Hydrogel for Controlled Release of Citral and Bacteriostatic Effects

Han

Zhu

Cheng

2023

ACS Appl. Mater. Interfaces

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In this study, double cross-linked acrylic acid/bagasse cellulose (AA/BC) porous hydrogels were first prepared using cold plasma (CP) technology instead of chemical initiators. The structure and properties of porous hydrogels, as well as the controlled release and bacteriostatic application as functional carriers, were investigated. Results showed that a novel double cross-linked hydrogel had been successfully synthesized by utilizing •OH and H+ produced during plasma discharge. The acrylic acid (AA) monomers were successfully grafted onto the main chains of bagasse cellulose (BC), forming a porous three-dimensional network structure. The AA/BC porous hydrogels showed excellent swelling levels and intelligent responses. The release of citral in hydrogel inclusion compounds embedded with citral was controlled by adjusting the pH, and the slow release period was about 2 days. The inclusion compounds presented strong bacteriostatic effects against Escherichia coli and Staphylococcus aureus, extending the shelf life of fruits for about 4 days. Therefore, it can be concluded that CP technology is considered to be an efficient and environmental-friendly initiation technology for preparing hydrogels. The potential application of hydrogel inclusion compounds in the food field is expanded.

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Section: Resultsmentioning

confidence: 99%

Section: 2mentioning

confidence: 96%

Section: Mechanism Of Double Cross-linked Hydrogelsmentioning

confidence: 99%

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Novel Double Cross-Linked Acrylic Acid/Bagasse Cellulose Porous Hydrogel for Controlled Release of Citral and Bacteriostatic Effects

Han

Zhu

Cheng

2023

ACS Appl. Mater. Interfaces

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“…As the drying temperature increases, the condensation reaction becomes easier. More and In the CMC spectrum, the peaks of 1634 cm −1 correspond to the characteristic absorption peaks caused by -COOH stretching vibration [31]. According to a mass ratio of 2:8, HBPEI is added to CMC and dried at different temperatures.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries

Zeng

Yue

et al. 2023

Batteries

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Silicon has gained considerable attention as an anode material in lithium-ion batteries due to its high theoretical capacity. However, the significant volume changes that occur during lithiation/delithiation processes often result in poor cycling stability of silicon anodes. In this study, a hybrid ionically covalently cross-linked network binder carboxymethylcellulose-hyperbranched polyethyleneimine (CMC-HBPEI) is successfully constructed by “switching” ionic bonds and partially “converting” them to covalent bonds to buffer the volume variation of silicon anodes. In this hybrid cross-linked network, the covalently cross-linked network is responsible for maintaining the structural integrity of the anode, while the ionically cross-linked network utilizes the bonding reversibility to sustainably dissipative the mechanical stress and self-heal the structural breakages generated from the lithiation expansion of silicon. By changing the drying temperature of the anode, the ratio of covalent and ionic bonds in the hybrid cross-linked network can be adjusted to balance the mechanical stability and bonding reversibility of the CMC-HBPEI binder. Even after 300 cycles of charging/discharging under a current density of 500 mAg−1, the specific capacity of the optimized Si/CMC-HBPEI anode remains at 1545 mAhg−1.

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“…There are a large number of hydrogel applications including drug delivery, heavy metal removal, wound dressing, contact lenses, sensors, energy storage, and tissue engineering [3][4][5]. Towards the green technology, recent research has focused on bio-based hydrogels, such as chitosan, cellulose, starch, alginate, and gelatin, due to their biocompatibility, biodegradability, non-toxicity, and responsiveness [3,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Chemical Compositions of Chitosan-Based Hydrogel on Properties and Collagen Release

Boonruam

Wattanachai

2021

AEJ

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Chitosan-based hydrogels have drawn attention from a wide range of applications including drug delivery, heavy metal removal, and wound dressing. This is due to its biocompatibility, biodegradability, and responsiveness. Physical crosslinking is an easy and eco-friendly way to form hydrogels and the degree of crosslinking influences their mechanical and mass-transport properties. In this research, polyvinyl alcohol (PVA) was used as a co-hydrogel base polymer along with chitosan, where it was found that an increase in the PVA content by 1% w/v improved the tensile strength of the hydrogel film by 75%. An increase in glycerol which is a plasticizer increased hydrogel elasticity but lowered the tensile strength of the film. When the surfactant, Polysorbate80 (PS80), was added at a concentration of 0.5% w/v, the tensile strength improved between 70-150%. The hydrogel film with a high degree of crosslinking possessed good mechanical properties; however, contained less amounts of voids resulting in less water absorption. The results illustrated that percent swelling as high as 650% could be obtained. Surprisingly, although the percent swelling varied according to the mechanical properties of the films, the absorption of collagen solution was indistinguishable and remained at 30% absorption for all the film compositions studied. Nevertheless, collagen release correlated with the mechanical properties and percent swelling of the hydrogel films, where high percent swelling films released collagen faster. As they are physically incorporated, there are weak interactions between collagen and hydrogels, resulting in considerably fast collagen release which was completed within 5-6 hrs.

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Role of acid treatment combined with the use of urea in forming cellulose hydrogel

Cited by 11 publications

References 36 publications

Novel Double Cross-Linked Acrylic Acid/Bagasse Cellulose Porous Hydrogel for Controlled Release of Citral and Bacteriostatic Effects

Novel Double Cross-Linked Acrylic Acid/Bagasse Cellulose Porous Hydrogel for Controlled Release of Citral and Bacteriostatic Effects

Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries

Effects of Chemical Compositions of Chitosan-Based Hydrogel on Properties and Collagen Release

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