An alternative method of synthesizing ZnO-TiO 2 nanorods is through route precipitation and sintering at 600 C. In this study, the introduction of Ti into Zn in the molar ratio Ti:Zn (1:3) produced a composite ZnO-Low TiO 2 (ZnO-LTiO 2 ) while 1:1 produced ZnO-High TiO 2 (ZnO-HTiO 2 ). The effect of the Ti introduced on the antibacterial properties of ZnO-TiO 2 nanorods was investigated with the product structure characterized by XRD and the optimal intensity at 2θ: 31.72 , 34.37 , 36.19 showed a Wurzite structure and a crystal size of 35.8-41.5 nm. The average pore diameters for ZnO-LTiO 2 and ZnO-HTiO 2 were around 5.159 nm and 6.828 nm while the surface areas were 15.692 m 2 /g and 15.421 m 2 /g respectively. The anti-bacterial textile fiber construction was prepared using dip-spin coating with the application of an adipic acid crosslinker for 6 h and stable coating up to 10 times washing. The improvement of Pseudomonas aeruginosa (Pa) antibacterial properties in the textiles with coating had an inhibition zone of 20.5-25.0 mm and 16.2 mm without the coating. The elements of the cotton fiber construction include C at 54.60%, O at 40.89%, Ti at 0.81% and Zn at 2.60% while the TG-DTA analysis conducted showed an increase in the heat stability of the textile fibers to a temperature of 400 C, after which the textiles were modified by coating ZnO-TiO 2 nanorods. The findings of this research could be successfully applied to improve the antibacterial properties of textiles.

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A superhydrophobic cotton textile with high antibacterial properties has been fabricated. The cotton textile was coated through the in situ growth of ZnO-SiO 2 nanoparticles in presence of chitosan as the template agent via a hydrothermal process at 95 C. This process was followed by the coating of additional layers of hexadecyltrimethoxysilane (HDTMS). The obtained cotton textile showed antibacterial property against Staphylococcus epidermis and Escherichia coli with inhibition zones up to 18.26 and 8.48 mm, respectively. Scanning electron microscopy (SEM) revealed that the coating had a rough surface, which was attributed to the distribution of ZnO-SiO 2 nanorods of hexagonal shape. This rough surface creates a superhydrophobic layer that repels the bacteria, as proven by the large water contact angle of approximately 150 . Nevertheless, the HDTMS layers prolong the durability of hydrophobicity for up to 3 h. K E Y W O R D S antibacterial textile, E. coli, hydrophobic textile, Staphylococcus epidermis, ZnO-SiO 2

This study aims to conduct the synthesis and characterization of nanohybrid multilayer ZnO-SiO2/Chitosan (NHMZnO-SiO2/Chitosan) using SEM and TEM to show the rod-shape morphology. Furthermore, the compound is used as a textile fiber coating material for anti-bacterial and UV-protected applications. The process was followed by hydrophobization of Dodecyltrietoxysilane (DTS) using a 1,2,3,4-butane tetracarboxylic acid (BTCA) crosslinker. FT-IR showed that the coating of NHM-ZnO-SiO2/Chitosan on textile fibers has covalent ester interactions with the appearance of the C=O stretching functional group at ~1700 cm-1 and each cotton fabric provided different intensity. Meanwhile, SEM showed that the layer has a rough surface, which is associated with the distribution of NHM-ZnOSiO2/Chitosan to create a hydrophobic surface, as evidenced by the water contact angle WCA = 100-119o. Furthermore, UV-DRS analysis was also conducted for UV protection testing and a decrease in the value of Eg = 2.87 eV on textiles coated with NHM-ZnO-SiO2/Chitosan and DTS was obtained. Anti-bacterial activity of uncoated, BTCA - ZnO-SiO2/Chitosan coating, BTCA - ZnO-SiO2/Chitosan coating, and DTS textiles were evaluated against bacterial cells of Staphylococcus epidermidis (37.7 - 47.2) mm and Pseudomonas aeruginosa (42.0 - 49.2) mm.

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The biosynthesis of ZnO is performed through enzymatic mechanisms for controlling the particle size and morphology with using the sol‐gel method. Furthermore, this method utilizes a stabilizer obtained from the cell biomass of Aspergillus niger mold in order to yield homogeneous and consistent products. The evaluation of functional, morphological, and antibacterial activities was carried out at pH 6.0‐13.0. The analysis FT‐IR showed the interaction of hydroxyl groups, aromatic rings, as well as N−H and O−Zn‐O compounds at a wavenumber of 401–584 cm−1. The XRD and SEM characterizations showed that ZnO structure and crystal phase were hexagonal wurtzite at dimensions of 36.2 ‐ 45.4 nm. The differences in pH also influenced the dimensions, morphology, and antimicrobial activity. ZnO with a pH of 8.0 was characterized by FESEM‐EDAX, based on the analysis of morphological uniformity. This characterization obtained rod and cube structures, with atomic ratios of Zn=61.5 % and O=38.5 %. The UV‐DRS spectrum showed that the optical band gap with a value of Eg=3.00–3.11 eV. The differences in morphology further distinguished antibacterial properties on textile fibers, through the use of the Gram ‐ and + bacteria (Pseudomonas aeruginosa and Staphylococcus aureus), with inhibition zones of 17–21 mm and 21–25 mm, respectively. Therefore, ZnO is classified as a very strong antibacterial material than amoxicillin, with an inhibition zone of 13.6 mm.

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