Seznam abstraktů 2020: SEKCE B - PRŮMYSLOVÉ A ENVIROMENTÁLNÍ APLIKACE NANOMATERIÁLŮ

Thin-film transition metal oxides can be applied as transparent conductive coatings, photocatalysts, thermoelectric generators, and battery electrodes. This work is devoted to Atomic layer deposition (ALD) of thin-films of nickel-cobalt oxides and evaluating their performance as negative electrodes for solid-state lithium-ion batteries. Nickelocene and cobaltocene (Ni(Cp)2, Co(Cp)2) were used as initial reagents for deposition of NiO and CoO and were kept at 110 and 160 °C, respectively. Oxygen plasma was used as a counter-reagent. Each precursor pulse and plasma treatment have followed by the stage of N2-purge and evacuation of the reactor for 10 seconds. The deposition process was conducted at 300 °C. The 5/1, 3/1, and 1/1 ratios of NiO/CoO ALD cycles were applied to deposit NiCoO films with different Ni/Co ratio. The electrochemical performance of synthesized thin films was studied by cyclic voltammetry and galvanostatic cycling. It was found that with an increase of the nickel content in the coatings, the electrode's specific capacity is increasing. The highest capacity at high discharge currents (35C) is observed for the sample obtained with NiO/CoO - 5/1 ratio (80 µA·h·µm-1·cm-2). Acknowledgements: The research was conducted under the financial support of the Russian Science Foundation grant (project No. 18-73-10015).

Flexible ultra-thin glass is used as a substrate or packaging material in microelectronics engineering, where the level of cleanliness determines the quality of the final product. Surface properties of glass are governed by a surface nano-layer. Besides cleaning from coarse impurities, the demand is also for nano-decontamination, where standard cleaning proves insufficient. In microelectronics and printed flexible electronics, the bonding of thin structures deposited using printed conductive inks on glass substrates is of essential importance. The non-thermal, atmospheric-pressure plasma generated by diffuse coplanar surface barrier discharge (DCSBD) was studied as an effective pre-treatment method for cleaning and activation of glass surfaces, implementable into large-scale in-line manufacturing. Two industrial adaptations of DCSBD system were applied on two types of ultra-thin flexible glass to compare the effects of plasma treatment of glass in both relaxed, and bent state. DCSBD “Air-pillow” with a planar discharge unit is designed for contactless treatment of smooth flat large-area surfaces. A roll reactor with a concavely curved DCSBD unit is intended to exemplify its integration into roll-to-roll manufacturing. The effect of plasma treatment and its stability was analyzed with water contact angle measurement and X-ray photoelectron spectroscopy. Significant wettability improvement was achieved with both applied DCSBD geometries, with better effect uniformity and durability after using the DCSBD in the planar configuration.
This research has been supported by the projects CZ.01.1.02/0.0/0.0/16_053/0007132 funded by the European Regional Development Fund and by the German BMWi under grant No. ZF4028609AG6 and project FV40114 funded by the Ministry of Industry and Trade.

Process of nanoparticle transport in rock is important in many applications. Although generic physical mechanisms are known, understanding of processes and their quantification can be improved by more detailed experiments. One of the limitations in experiments so far is a capturing of the spatial distribution of nanoparticles concentration.
A new probe for zero-valent iron nanoparticles (nZVI) concentration measurement in a micro-borehole is introduced and the experiment of particles breakthrough in the artificial fracture in a granite block of meter-size is made. The concentration is measured continuously by the probes in micro-boreholes from the block top into the fracture and by chemical analyses of samples at the outflow.
The probes use an already known and verified principle - presence of iron particles near a coil changes its inductance - but in this case applied in much smaller scale of about one centimetre, allowing measurement of "point" concentration values and an access to a selected position inside a block of rock. The construction of probe as a packer required to install all the electronics for LC circuit resonance frequency measurement inside and to solve several issues to reach the necessary sensitivity and stability to detect nZVI in a small volume of the fracture.
The experiment verified the process of advection and dispersion and the average transport velocity determined from the flow rate. The ratio of mobile particles and gradual coagulation and sedimentation was determined from evaluating the probe measurement inside the block and overall iron content in the outflow.

Global pollution and population growth leads to increase demands in filtration market to protect environment. So far, electrospun nanofibers seem interesting in filter domain area due to their highly porous structure, narrow pore size and high specific surface area. Herein, polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN) nanofibers were prepared as hybrid membranes. Their surface was hydrophilized using chemical modification method and performance for the treatment of oily waste water was compared. The hydrophilic modification of the membrane surface has brought anti-fouling properties. Results indicated that nanofibrous membranes may become interesting materials for the treatment of oily wastewater.