【摘要】 使用冠醚交联壳聚糖(CTSG)做吸附剂和保护剂,在水介质中用水合肼还原硝酸银制备纳米银。结果表明:40℃时,水合肼与硝酸银(浓度均为0.1mol/L)摩尔比为6∶1,CTSG用量为0.4g时得到粒径为30~40nm的纳米银颗粒。保持水合肼和硝酸银的摩尔比6∶1不变,纳米银粒径随水合肼和硝酸银浓度的增加而增大,当硝酸银浓度≤0.25mol/L时,改变银离子浓度对粒径影响不大,且稳定在50nm左右;而银颗粒则随水合肼浓度的减小规律递减。用纳米粒度及Zeta电位分析仪和TEM,对得到的纳米银粒的粒径及形貌进行表征。更多还原

【Abstract】 Nanometer silver was prepared using the in-situ reduction of silver nitrate by hydrazine hydrate with the absorption and protection of dibenzo-18-crown-6 ether crosslinked chitosan（CTSG）.The result shows that nano-silver with the diameter of 30～40nm can be achieved at 40℃ in the condition that mole ratio of hydrazine hydrate and silver nitrate（0.1mol/L） is 6∶1,and the weight of CTSG is 0.4g.Keeping the mole ratio of hydrazine hydrate and silver nitrate as 6∶1,the diameter of nano-silver become larger with the increasing concentration of hydrazine hydrate and silver nitrate.The diameter of about 50nm nano-silver is obtained when the concentration of AgNO₃≤0.25mol/L,and the diameter decrease steadily with the reducing hydrazine hydrate concentration.The products are characterized by Zetasizer Nano Zs and TEM.更多还原