Hydrogels Prepared from Unsubstituted Cellulose in NaOH/Urea Aqueous Solution

Zhou, Jinping; Chang, Chunyu; Zhang, Ruping; Zhang, Lina

doi:10.1002/mabi.200700007

Cited by 178 publications

(94 citation statements)

References 29 publications

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“…1. The novel modified crosslinking process will be supported by the presence of epichlorhydrin in a reaction through the cellulose hydroxyl groups as reported in the literature (Zhou et al 2007;Simkovic 1999;Nada and Hassan 2006).…”

Section: Introductionmentioning

confidence: 98%

N-halamines from rice straw

et al. 2011

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The cellulosic part of rice straw was modified to develop N-halamine 11 derivatives for disinfection. The process involved cross-linking of the cellulosic material 12 with amino/amide/imide containing compounds; cyclic and acyclic. The structures of the 13 prepared materials were identified using FTIR and solid state 13 CNMR. The modified 14 materials were halogenated to form N-halamines and the antimicrobial activity of each 15 evaluated against examples of Gram-positive (Staphylococcus aureus) and Gram-16 negative bacteria (Escherichia coli) using a variety of methods; agar plate, blended agar, 17 stirred flask and in columns. One of the N-halamines achieved a 9 log reduction against 18 both E. coli and S. aureus in 4 hours. In addition, no S. aureus growth was recorded on 19 agar plates blended with 0.5g of this same material. 20

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Section: Introductionmentioning

confidence: 98%

N-halamines from rice straw

et al. 2011

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“…[27] Moreover, we have successfully synthesized cellulose hydrogels in NaOH/urea aqueous solution to show macroporous inner structure. [28] In the present study, we attempted to improve the degree of swelling and mechanical properties of hydrogel materials by chemical and physical crosslinking, respectively, in NaOH/urea aqueous system. Their structure and properties were characterized by Fouriertransform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and rheological measurements.…”

Section: Introductionmentioning

confidence: 99%

Effects of Crosslinking Methods on Structure and Properties of Cellulose/PVA Hydrogels

Chang

Zhang

2008

Macro Chemistry & Physics

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214

115

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A series of hydrogels were prepared from cellulose and PVA in NaOH/urea aqueous solution using both physical and chemical crosslinking methods. The hydrogels were secure and biodegradable materials. Their structure and properties were characterized by FTIR spectroscopy, DSC, XRD and SEM. The results indicated that all of the cellulose/PVA hydrogels exhibited homogeneous porous structures and a certain miscibility. The swelling degree and water uptake of the chemical hydrogels were markedly higher than those of the physical hydrogel. This work demonstrates two novel methods to prepare cellulose/PVA hydrogels with different functional properties via a green process.magnified image

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“…Optical methods such as lithography typically rely on wavelength-specific dimensions to achieve appropriate nanoscale modifications; however, the approach is labor-intensive and requires considerable development prior to clinical translation. 31 Chemical methods involving acid-etching, peroxidation, alkali treatment, anodization, and nanoparticle deposition such as sol-gel (colloidal particle adsorption) can impart nanoparticles to the surface and display strong physical interactions at the atomic-scale level. 32 Among these chemical methods, acid etching with hydrofluoric acid (HF) has been used to create hierarchical micro-/nano-structures because of its high efficiency, simple operation, high volume of production, and incorporation of the osteogenic element fluoride ion onto surfaces.…”

Section: Introductionmentioning

confidence: 99%

Osteogenic activity of titanium surfaces with hierarchical micro/nano-structures obtained by hydrofluoric acid treatment

Liang¹,

Xu²,

Shen³

et al. 2017

IJN

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An easier method for constructing the hierarchical micro-/nano-structures on the surface of dental implants in the clinic is needed. In this study, three different titanium surfaces with microscale grooves (width 0.5–1, 1–1.5, and 1.5–2 μm) and nanoscale nanoparticles (diameter 20–30, 30–50, and 50–100 nm, respectively) were obtained by treatment with different concentrations of hydrofluoric acid (HF) and at different etching times (1%, 3 min; 0.5%, 12 min; and 1.5%, 12 min, respectively; denoted as groups HF1, HF2, and HF3). The biological response to the three different titanium surfaces was evaluated by in vitro human bone marrow-derived mesenchymal stem cell (hBMMSC) experiments and in vivo animal experiments. The results showed that cell adhesion, proliferation, alkaline phosphatase activity, and mineralization of hBMMSCs were increased in the HF3 group. After the different surface implants were inserted into the distal femurs of 40 rats, the bone–implant contact in groups HF1, HF2, and HF3 was 33.17%±2.2%, 33.82%±3.42%, and 41.04%±3.08%, respectively. Moreover, the maximal pullout force in groups HF1, HF2, and HF3 was 57.92±2.88, 57.83±4.09, and 67.44±6.14 N, respectively. The results showed that group HF3 with large micron grooves (1.5–2.0 μm) and large nanoparticles (50–100 nm) showed the best bio-functionality for the hBMMSC response and osseointegration in animal experiments compared with other groups.

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Hydrogels Prepared from Unsubstituted Cellulose in NaOH/Urea Aqueous Solution

Cited by 178 publications

References 29 publications

N-halamines from rice straw

N-halamines from rice straw

Effects of Crosslinking Methods on Structure and Properties of Cellulose/PVA Hydrogels

Osteogenic activity of titanium surfaces with hierarchical micro/nano-structures obtained by hydrofluoric acid treatment

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