The obtained nano-sized CuCl/CTS samples were characterized by transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). Based on the obtained results, the reaction factors for fabrication of the colloidal nano-sized CuCl/CTS solution with Cu concentration of 5,000 ppm and CuCl nanoparticle size of about nm dispersed in 1 % chitosan solution were selected for application in agriculture as a fungicide for plant protection. | Vietnam Journal of Chemistry, International Edition, 55(4): 460-464, 2017 DOI: Large-scale fabrication of colloidal nano-sized CuCl solution with high concentration for using as fungicide for plant Bui Duy Du1,2*, Lai Thi Kim Dung1, Le Nghiem Anh Tuan1,2, Nguyen Quoc Hien2 1 Institute of Applied Materials Science, Vietnam Academy of Science and Technology 2 Graduate University of Science and Technology, Vietnam Academy of Science and Technology 3 Research and Development Center for Radiation Technology, Vietnam Atomic Energy Institute Received 9 December 2016; Accepted for publication 28 August 2017 Abstract Synthesis of nano-sized CuCl with Cu concentration from 4,000 to 6,000 ppm dispersed in chitosan solution (nanosized CuCl/CTS) using as the precursor and NaHSO3 as the reducing agent in HCl acid medium on large scale of kg/batch was carried out. The obtained nano-sized CuCl/CTS samples were characterized by transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). Based on the obtained results, the reaction factors for fabrication of the colloidal nano-sized CuCl/CTS solution with Cu concentration of 5,000 ppm and CuCl nanoparticle size of about nm dispersed in 1 % chitosan solution were selected for application in agriculture as a fungicide for plant protection. Keywords. Nano-sized CuCl, NaHSO3, HCl, chitosan. 1. INTRODUCTION Copper salts (Cu2+ and Cu+ ions) were used as fungicide for a long time due to their highly antifungal effectiveness for plants, low cost, low toxicity and after killing fungi, they turn into microelement nutrition for plants as well [1]. However, some disadvantages of using copper salts including CuCl as fungicide are of high concentration to achieve required fungicidal effect and difficul to mix with other kinds of acidic or basic fungicides. Compared to bulk CuCl, nanosized CuCl is less toxic and possesses larger contact surface area. Furthermore, nano-sized .
