Department of Chemistry, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Molecules. 2013 May 28;18(6):6269-80. doi: 10.3390/molecules18066269.
Synthesis of ZnO-Ag heterostructure nanoparticles was carried out by a precipitation method with cellulose nanocrystals (CNCs) as a stabilizer for antimicrobial and thermal studies. ZnO-Ag nanoparticles were obtained from various weight percentages of added AgNO₃ relative to Zn precursors for evaluating the best composition with enhanced functional properties. The ZnO-Ag/CNCs samples were characterized systematically by TEM, XRD, UV, TGA and DTG. From the TEM studies we observed that ZnO-Ag heterostructure nanoparticles have spherical shapes with size diameters in a 9-35 nm range. The antibacterial activities of samples were assessed against the bacterial species Salmonella choleraesuis and Staphylococcus aureus. The CNC-stabilized ZnO-Ag exhibited greater bactericidal activity compared to cellulose-free ZnO-Ag heterostructure nanoparticles of the same particle size. The incorporation of ZnO-Ag hetreostructure nanoparticles significantly increased the thermal stability of cellulose nanocrystals.
采用沉淀法合成了 ZnO-Ag 异质结构纳米粒子，并用纤维素纳米晶体（CNC）作为稳定剂，进行抗菌和热研究。通过添加相对于 Zn 前体的不同重量百分比的 AgNO₃，获得了 ZnO-Ag 纳米粒子，以评估具有增强功能特性的最佳组成。通过 TEM、XRD、UV、TGA 和 DTG 对 ZnO-Ag/CNC 样品进行了系统的表征。从 TEM 研究中我们观察到 ZnO-Ag 异质结构纳米粒子具有球形形状，粒径在 9-35nm 范围内。评估了样品对细菌物种肠炎沙门氏菌和金黄色葡萄球菌的抗菌活性。与相同粒径的无纤维素的 ZnO-Ag 异质结构纳米粒子相比，CNC 稳定的 ZnO-Ag 表现出更强的杀菌活性。ZnO-Ag 异质结构纳米粒子的掺入显著提高了纤维素纳米晶体的热稳定性。
