Structure and properties of hydrogels prepared from cellulose in NaOH/urea aqueous solutions

Chang, Chunyu; Zhang, Lingzhi; Zhou, Jinping; Zhang, Lina; Kennedy, John F.

doi:10.1016/j.carbpol.2010.04.033

Cited by 259 publications

(113 citation statements)

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“…The morphology and the properties of the cellulose nanocrystals are influenced by its preparation and the dissolution methods used (El-Wakil and Hassan 2008;Chang et al 2010, Chang andZhang 2011). As a renewable material, cellulose and its derivatives have been comprehensively studied, with a focus on their biological, chemical, and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Anticorrosion Properties of Epoxy/Nanocellulose Nanocomposite Coating

et al. 2017

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Nanocellulose (NC) is an attractive reinforcement agent that can be incorporated into protective coatings because it is a renewable, biodegradable, and biocompatible polymer resource. In this study, a series of epoxy resin-based nanocomposites were prepared in the form of coatings with various amounts of NC loadings, and the coatings were applied onto mild steel at room temperature. The characterizations of the NC and nanocomposites were performed via X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and Fourier transform infrared spectroscopy (FTIR). The thermophysical properties of the nanocomposites were evaluated using differential scanning calorimetry (DSC) and thermogravimetry (TGA) analyses. The transparency of the nanocomposite specimens was examined by ultraviolet visible (UV-Vis) spectroscopy in the range of 300 to 800 nm. The corrosion protection properties of the coated mild steel substrates immersed in a 3.5% NaCl solution were studied comparatively by electrochemical impedance spectroscopy (EIS). The results showed that all of the nanocomposite coatings with NC noticeably influenced the epoxy-diamine liquid pre-polymer, both physically and chemically. Furthermore, the 1 wt.% NC nanocomposite coating system was found to have the most pronounced anti-corrosion properties, as confirmed by a 30-day EIS study.

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Section: Introductionmentioning

confidence: 99%

Anticorrosion Properties of Epoxy/Nanocellulose Nanocomposite Coating

et al. 2017

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“…Lastly, transparent cellulose hydrogels can be made by cellulose regeneration via changing the solution conditions (i.e., pH, temperature). These hydrogels (Isobe et al 2013) are highly porous, with 50 nm to 100 nm pores and large surface areas of 300 m 2 /g to 400 m 2 /g (Chang et al 2010). For this study, hydrogels were synthesized with a "one-step" method from unsubstituted cellulose that was dissolved directly in a sodium hydroxide (NaOH)/urea aqueous solution by adjusting the pH and temperature.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Flower-like ZnO Nanoparticles in a Cellulose Hydrogel Microreactor

Qin

Jiang

et al. 2017

BioResources

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*Flower-like zinc oxide (ZnO) nanoparticles were synthesized with sodium hydroxide and zinc acetate in a cellulose hydrogel microreactor (prepared by the inversion method). The samples were characterized by scanning electron microscopy, EDX, x-ray diffractometry, ultravioletvisible diffuse reflection spectroscopy, and nitrogen adsorptiondesorption. The results indicated that ZnO grows in a flower-like shape in the pores of the cellulose hydrogel. The pure hexagonal wurtzite structures have uniform diameters in the range of 10 nm to 30 nm, surface areas of 39.18 m 2 /g, and pore volumes of 0.2109 cm 3 /g. This study also investigated the photocatalytic properties. The nanoparticles have a band gap of 3.23 eV and a 95.2% efficiency for the ultraviolet degradation of rhodamine B over 3 h at room temperature.

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“…Carrageenan hydrogels are also promising for industrial immobilisation of enzymes (Campo et al, 2009). Hydrogels can also be synthesized from cellulose in NaOH/urea aqueous solutions by using epichlorohydrin as cross-linker and by heating and freezing methods (Chang et al, 2010;Chang & Zhang, 2011).…”

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confidence: 99%