On Controlling the Hydrophobicity of Nanostructured Zinc-Oxide Layers Grown by Pulsed Electrodeposition

Nanostructured ZnO Arrays Fabricated via Pulsed Electrodeposition and Coated with Ag Nanoparticles for Ultraviolet Photosensors

“…After condensation, the crystals with the amorphous carbon films were extracted from the vacuum chamber and dissolved in distilled water, and then the films were caught on electron microscopy grids. According to [23] the crystal structure of ZnO and Ag/ZnO was analyzed by using of X-ray diffraction patterns (XRD) recorded with "DRON-4" diffractometer in CoKα radiation using Bragg-Brentano focusing. The crystalline phases were revealed by comparing the recorded diffraction patterns and the reference JCPDS database.…”

“…ФІЗ. 10, 03027 (2018) 03027-3 of the indexed lines in the X-ray diffraction patterns by the Nelson-Reilly graphical extrapolation method and refined using the least-squares method (LSM) by "UnitCell" software on the basis of all recorded reflections in the X-ray diffraction patterns, in accordance with [23]. The residual stresses in the ZnO arrays were calculated from the lattice constants of the electrodeposited and reference samples by using the elasticity constants of the material in various directions.…”

“…The residual stresses in the ZnO arrays were calculated from the lattice constants of the electrodeposited and reference samples by using the elasticity constants of the material in various directions. In accordance with [23] the sizes of the coherent-scattering domains (D) of ZnO and microstrains Δd/d were estimated using the Williamson-Hall approximation method. Similar to that described in [24] for the electrodeposited layers, it was suggested that D is equal to the average size of nanocrystalline ZnO grains.…”

Modelling and Investigation of the Dependence of Superhydrophobic Properties of Nanosurfaces on the Topology of Microchannels

“…The importance of this problem is due to the fact that superhydrophobic surfaces in the Cassie-Baxter state (sometimes also in the Wenzel state) can have exceptional lubricating properties [34]- [36] and generate secondary flows, transverse to the direction of the applied pressure gradient [37]- [39]. To achieve these lubricating properties, a controlled transition from superhydrophobic surfaces with a disordered texture to superhydrophobic surfaces with an ordered texture is required [40]. The wettability of the material, as well as its ability to repel water or hold a drop due to its strong adhesion to the solid surface, play a crucial role in such micro-and nanotechnologies and nanomaterials as vortex bioreactors, immersion lithography, dipping coating, inkjet printing, wear-resistant implant for human joint replacements, biological microelectromechanical systems, microscale thermalphysic devices, etc.…”

“…In order to achieve the state of superhydrophobicity of nanostructured surfaces with the "lotus effect", they are modified by additionally depositing water-repellent coatings on them in the form of ultra-fine layers of compounds with low surface free energy [44], [46], [48]. In the work [40], the possibility of creating of highhydrophobic nanostructured zinc oxide (ZnO) layers without any water-repellent coatings were experimentally demonstrated by means of pulsed electrodeposition from aqueous solutions: authors experimentally revealed the conditions for deposition of high-hydrophobic nanostructured zinc oxide layers characterized by the "rose petal effect" with specific morphology, optical properties, crystal structure and texture. Nevertheless, Cassie-Baxter state is, as a rule, unstable and prone to full or partial transformation to the Wenzel state under the external influences, for example, under the influence of pressure, heating, vibration or expulsion of drop [45].…”