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An In situ Forming Hydrogel Based on Photo-Induced Hydrogen Bonding
Jingyan Zhang,Shifeng Wang,Zeren Zhao,Dong Si,Haiou Zhou,Mingdi Yang,Xianbiao Wang 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
Stimulus-induced in situ forming hydrogels possess the characteristics of easy management and minimal invasiveness via simple injection at target sites with a liquid and easy forming bulk gels. In the present study, a photoreactive monomer, N'-(2-nitrobenzyl)-N-acryloyl glycinamide (NBNAGA) was introduced to modify polyacrylamide (PAM) hydrogel preparation with stimuli responsiveness. Firstly, poly(acrylamide-co-N'-(2-nitrobenzyl)-N-acryloyl glycinamide), P(AM-co-NBNAGA), copolymer solution was prepared via reversible addition fragmentation chain transfer (RAFT) polymerization using the monomers mixture of AM, NBNAGA, and N,N'- methylene bis-acrylamide (BIS). The obtained polymer solution with viscous, transparent, and flowable appearance contained weak single hydrogen bonding and slight chemical crosslinking in a microscopic perspective. Secondly, without further purification, after irradiation using UV light at 365 nm, poly(acrylamide-co-N-acryloyl glycinamide) (P(AM-co-NAGA)) hydrogel conveniently in situ formed due to the cleavage of o-nitrobenzyl groups and the corresponding emergency of dual hydrogen bonding among “uncaged” dual amide moieties. P(AM-co-NAGA) hydrogel depicted both favorable temperature sensitivity and self-healing properties, then the heating induced in vitro release profiles of doxorubicin (DOX) was analyzed.
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Zhenfan Chen,Shaofeng Zhua,Qingqing Wang,Xianbiao Wang 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.1
Geopolymer porous ceramics with high porosity were prepared using casting process with metakaolin as the main rawmaterial and coconut diethanolamide as the blowing agent. The effects of sintering temperature and calcium oxide contenton the phase composition, microstructure and physical properties of geopolymer porous ceramics were investigated throughX-ray diffraction, scanning electron microscopy, etc. The results show that for the samples without calcium oxide, thecompressive strength and volume shrinkage gradually increase, while the open porosity gradually decreases with the sinteringtemperature increases. After the green body was sintered at 1200 ℃ for 2 hours, porous ceramic product with compressivestrength of 22.9 MPa, open porosity of 41.8%, and leucite as the main phase was obtained. The addition of calcium oxide in thepreparation process not only accelerate the solidification of geopolymer gel slurries and make the pores distribute in the heightdirection more evenly, but also acts as a modifier to lower the crystallization temperature of leucite in the sintering process. When the relative mass of calcium oxide to metakaolin is 6%, after sintering at 1000 ℃ for 2 hours, porous ceramic productswith uniform pore size distribution containing leucite phase can be obtained. In addition, the potential of geopolymer porousceramics as adsorbing material was validated by adsorption experiment of Pb(Ⅱ) solution
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