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Hydrothermal Synthesis of Exfoliative LDH in the Presence of Glycine
Bao-guang Li1,2, Yuan Hu*3, Zu-yao Chen4
1.State Key Lab of Fire Science;2.Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;3.State Key Lab of Fire Science, Hefei 230026, China;4.Department of Chemistry, University of Science and Technology, Hefei 230026, China
Abstract:
Exfoliative Mg/Al layered double hydroxide (Mg/Al-LDHGly) was obtained via hydrothermal synthesis in the presence of glycine. The product prepared by hydrothermal reaction for 10 h at 120 ℃ possesses high thermal stability and maximal crystallite size in a, c directions. TEM and SEM analyses show that Mg/AlLDHGly was of well-crystallized hexagonal product with stacks of slightly curved layers. Benefiting from mechanism investigation on its gradual delamination in formamide, rapid delamination of Mg/Al-LDHGly at room temperature was realized, which provided fundamental for preparation of (Mg/Al-LDHGly)/polymer nanocomposites by using exfoliation-adsorption method.
Key words:  Layered double hydroxide (LDH), Glycine intercalation, Delamination, Hydrothermal synthesis
FundProject:
甘氨酸存在条件下水热合成可层离双氢氧化物
李宝光,胡源*,陈祖耀
1.中国科学技术大学火灾科学国家重点实验室,合肥,230026;2.中国科学技术大学化学系,合肥,230026
摘要:
在甘氨酸存在条件下,经混合金属盐溶液在pH为10.0时共沉淀后的水热反应,可成功合成甘氨酸插层的镁铝双氢氧化物(Gly-LDHHTT).产物以XRD、IR、TEM/SEM、TG/DTA等技术进行表征.结果表明, 120 ℃水热合成10 h的产物晶型完善,沿a和c方向的晶粒尺寸最大,产物热稳定性好. TEM观察晶粒呈明显的六边形, SEM形貌呈现边缘略有卷曲的团聚薄片.通过进一步探讨甘氨酸插层镁铝双氢氧化物层离的机制后,获得了在室温下实现水热合成产物快速层离的方法,为层离-吸附法成功运用于双氢氧化物/聚合物
关键词:  双氢氧化物, 层离, 水热合成
DOI:10.1360/cjcp2006.19(3).253.6
分类号: