Preparation, physicochemical and preservation properties of Ti/ZnO/in situ SiOx chitosan composite coatings

Abstract

BACKGROUND Among nanomaterials, Ti and ZnO nanoparticles are often chosen as preservation materials because of their antibacterial properties. Chitosan, as a natural biopolymer, has potential because of its abundance, compatibility and antibacterial properties. To improve the physicochemical and preservation properties of in situ SiOx chitosan (CS) composite coating, Ti/ZnO/SiOx CS composite coatings were prepared with Ti‐doped ZnO (Ti/ZnO) nanorods and nanoballs. The composite coating structures were characterized by Fourier transform infrared, X‐ray diffraction and scanning electron microscopy, and their physicochemical and preservation properties were determined simultaneously. RESULTS The results show that the Ti/ZnO nanoparticles are beneficial to homogeneous dispersion of in situ synthesized nano SiOx in the CS coating, and that Ti/ZnO nanoballs have better dispersion than Ti/ZnO nanorods. Moreover, strong hydrogen bonds are formed among Ti/ZnO nanoparticles and in situ synthesized nano SiOx and CS molecules, and the primary structure of CS is disorganized. Thereby, the gas permeabilities and mechanical properties of the CS coatings are improved due to modification of Ti/ZnO nanoparticles, and the Ti/ZnO nanoballs/SiOx CS composite coating is optimal. The preservation properties of the CS coatings on Sciaenops ocellatus are significantly improved, and those of Ti/ZnO/in situ SiOx CS composite coatings are superior. CONCLUSION The preservation properties of the CS composite coatings on S. ocellatus are significant, and the Ti/ZnO nanoballs/SiOx CS composite coating is even better. Therefore, the co‐modification method of in situ nanoparticles and antibacterial nanoparticles may be a promising method to improve the preservation properties of CS coatings. © 2019 Society of Chemical Industry

Composite coatings based on konjac glucomannan and sodium alginate modified with allicin and in situ SiOx for ginger rhizomes preservation

“…Therefore, at the ratio of KGM and SA in the present study, the molecules tend to aggregate, which may result in a rough surface of KGM/SA. After modified by allicin, the lumps disappear and the degree of fractures decrease in KGM/SA‐allicin, but small wrinkles are shown, indicating the addition of allicin improve the compatibility of KGM/SA and further weak the stress loss of film dehydration in the film formation process (Sun et al, 2016; Wei et al, 2019). After further modified by in situ SiO x , the morphology of the KGM/SA‐allicin‐SiO x film show a rough surface with much more graininess and smaller particles, which is consistent with the research from Wei et al (2019) who deduced the phenomenon may be due to the hydrogen bonds formed between polymer molecule and the active groups on in situ SiO x surface.…”

“…Nano SiO x is inorganic nonmetallic material that has characteristics of non‐pollution, nontoxic, and tasteless. Furthermore, it can bond with some groups of high polymer material and greatly improve coating properties (Wei et al, 2019). In situ synthesis nano SiO x is an effective method to modify coatings, which has been used for chitosan coating improvement (Sun et al, 2016; Wei et al, 2019).…”

“…Furthermore, it can bond with some groups of high polymer material and greatly improve coating properties (Wei et al, 2019). In situ synthesis nano SiO x is an effective method to modify coatings, which has been used for chitosan coating improvement (Sun et al, 2016; Wei et al, 2019). Allicin is a sulfo compound that extracted from garlic bulb, which has a broad‐spectrum antibacterial activity (Marchese et al, 2016).…”

Preparation and Characterization of Waterborne UV Lacquer Product Modified by Zinc Oxide with Flower Shape

“…AXIS UltraDLD XRD (Nippon Koji Co. Ltd, Osaka, Japan) was used to characterize the internal molecular structure of the sample. The scanning speed was set from 5 • to 70 • [51], the acceleration voltage was 40 kV, and the impressed current was 30 mA.…”

Preparation of nano-TiO2 composite photocatalytic material and its degradation performance on aldehydes

“…The peak at 3436 cm-1 was attributed to the stretching vibration of hydroxyl and amino groups in the composite material, which was lower than that of chitosan. This was because some groups in chitosan molecules acted on the OH bond on the surface of TiO2, which formed a strong hydrogen bond [8]. The band at 2924 cm-1 was due to the tensile vibration of C-H. About 1400 cm-1 was the bending vibration peak of CH3.…”