Abstract:

Dielectric-barrier discharge (DBD) is a typical non-equilibrium gas discharge with AC at low temperature and atmospheric pressure.In this paper the influence of DBD plasma on the crystallization of Cu(NO₃)_2· 3H₂O is investigated.The experimental results show that DBD plasma has great influence on inducing the primary nucleation thus greatly reducing the nucleation time.Moreover, by applying DBD plasma, the morphology of Cu(NO₃)₂·3H₂O was controlled during crystallization.In crystallization without DBD treatment, quadrilateral Cu(NO3)_2·3H₂O crystals were preferentially produced.However, if DBD plasma was applied during the nucleation process, the typical quadrilateral forms of crystal seeds transform to hexagonal crystals.The hexagonal crystals can grow to either hexagonal prism without further DBD plasma treatment or unique contact-twinned shaped hexangular star form under the environment of DBD plasma.

Key words: 介质阻挡放电等离子体, 结晶, 形貌控制

摘要： 介质阻挡放电(DBD)等离子体是一种典型的低温非平衡气体放电现象。本实验主要研究DBD等离子体对硝酸铜水溶液结晶的影响，发现DBD等离子体能有效引发硝酸铜水溶液的初始成核过程从而大大减少成核时间。在无等离子体作用下，室温下稳定的硝酸铜过饱和溶液析出硝酸铜晶体需2-3天，在等离子体作用下几分钟即可析出硝酸铜晶体。同时，通过控制DBD等离子体的施加时间，硝酸铜晶体的形貌也可以得到控制，呈现出四边形、六棱柱及六角星型等各种形貌。

关键词: 介质阻挡放电等离子体, 结晶, 形貌控制