1.
A multifunctional self-crosslinked chitosan/cationic guar gum composite hydrogel and its versatile uses in phosphate-containing water treatment and energy storage.
Dai, L, Wang, Y, Li, Z, Wang, X, Duan, C, Zhao, W, Xiong, C, Nie, S, Xu, Y, Ni, Y
Carbohydrate polymers. 2020;:116472
Abstract
A new self-crosslinked composite hydrogel is prepared with chitosan (CS) and cationic guar gum (CGG), based on the imine and acetal chemistry for gelation. The CS/CGG hydrogel exhibits thermal/pH responsiveness, injectability, adhesiveness and good compressive strength. The hydrogel is effective in removing phosphate from wastewater through an adsorption process, during which KH2PO4 is used as a phosphate model. The adsorption complies with the Freundlich model, indicating that it is a multilayered process with complex adsorption mechanisms. Considering their porous structure and nitrogen/phosphorus heteroatoms doping, the phosphate-adsorbed hydrogels are made into porous N,P doped carbon aerogels that can be potentially used as electrodes for a supercapacitor. The results indicate that these carbon aerogels possess excellent capacitive performance (best specific capacitance of 302.2 ± 4.9 F/g), as well as good cycling stability after 5000 times of charging/discharging.
2.
[The study of compressive strength of phosphate-bonded investment materials].
Li, Z, Hao, F, Xiong, Y
Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology. 2003;(4):284-6
Abstract
OBJECTIVE The purpose of this study was to compare the compressive strength of phosphate-bonded investments. METHODS The three sorts of investments were mixed according to manufacturer's recommendation before poured in the molds. After heated up to 900 degrees C, every sample was mounted on a universal experimental machine to test its compressive strength in ambient. RESULTS Significant differences were found between the four groups(P < 0.01). CONCLUSION From the data above it is concluded that the compressive strength of X-20 Chrome Investment mixed with the special liquid was the highest.