Preparation and Characterization of ZnO Nanoparticles Supported on Amorphous SiO2

Abstract

In order to reduce the primary particle size of zinc oxide (ZnO) and eliminate the agglomeration phenomenon to form a monodisperse state, Zn2+ was loaded on the surface of amorphous silica (SiO2) by the hydrogen bond association between hydroxyl groups in the hydrothermal process. After calcining the precursors, dehydration condensation among hydroxyl groups occurred and ZnO nanoparticles supported on amorphous SiO2 (ZnO–SiO2) were prepared. Furthermore, the SEM and TEM observations showed that ZnO nanoparticles with a particle size of 3–8 nm were uniformly and dispersedly loaded on the surface of amorphous SiO2. Compared with pure ZnO, ZnO–SiO2 showed a much better antibacterial performance in the minimum inhibitory concentration (MIC) test and the antibacterial properties of the paint adding ZnO–SiO2 composite.

Functionalized Zn@ZnO Hexagonal Pyramid Array for Dendrite‐Free and Ultrastable Zinc Metal Anodes

“…By contrast, at the side of Zn@ZnO HPA (blue square), where the ZnO layer is thin (≈7 nm), an interface between two different lattice fringes is observed. The d ‐spacings of 2.45 and 2.60 Å are indexed to the (101) and (002) planes of ZnO, respectively, [ 30 ] whereas for metallic Zn, a d ‐spacing of 2.11 Å corresponding to the (101) plane is observed. [ 31 ] The distribution of ZnO on the surface of Zn@ZnO HPA was confirmed using energy‐dispersive X‐ray spectroscopy (EDS) (Figure S3, Supporting Information).…”

Preparation of Nano-TiO2-Coated SiO2 Microsphere Composite Material and Evaluation of Its Self-Cleaning Property

“…Figure 9 shows the FT-IR spectra of SiO 2 and SiO 2 –TiO 2 with different TiO 2 ratios. The absorption bands at 1115, 808, and 477 cm −1 are typical absorption bands of Si–O bonds, indicating that the main component of the composite is SiO 2 [ 34 ].With the increase in the TiO 2 ratio, the intensity of absorption bands corresponding to SiO 2 decreased, indicating that the nano-TiO 2 coated the SiO 2 surface. In addition, the absorption bands (3200–3550 cm −1 ) derived from Si–OH and Ti–OH showed the significant displacement and broadening phenomena when the SiO 2 was coated by the nano-TiO 2 , indicating that the chemical environment had been changed and the association degree of hydroxyl groups on particles surface had increased.…”

Preparation and Characterization of Matrix Hybrid Membranes Polyvinylidene Fluoride/Polyvinylpyrrolidone/Silica Gel/Zinc Oxide for Cr(VI) Removal from Water

“…The α crystal phase of PVDF was identified in the XRD pattern of M3 by the presence of symmetry planes (001), (020) and (110). The effect of adding ZnO nanoparticles was shown by comparison between the XRD pattern of M3 membrane with ZnO/SiO2 XRD pattern [29] We deduced that the increase of the ratio ZnO(%wt)/SG(%wt) in polymeric structure is accompanied with difference in the shape of the peaks and affect the arrangement of atoms in certain region. In the XRD pattern of the M5 membrane, we recover the disappearance of the peak located at 14° (001) which corresponds to the structural atomic position of the PVDF (α phase) and a large difference in the intensities of the peaks at 20° (002) for the two samples M5 and M4, this proves the influence of ratio ZnO(%wt)/SG(%wt) on the positions of the atoms in the crystallographic planes of PVDF leading to a structural modification.…”

“…The recognition of the symmetry planes of the M3 membrane is based on the information collected from the literature of XRD diagram of ZnO with diffraction pattern peaks situated at 2θ=34°, 38° and 36.22° attributed respectively to crystallographic planes (100), (002) and (101) [29][30][31][32][33]. The α crystal phase of PVDF was identified in the XRD pattern of M3 by the presence of symmetry planes (001), (020) and (110).…”