Juha Merta

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The adsorption and viscoelastic properties of layers of a cationic polyelectrolyte (cationic starch, CS, with 2-hydroxy-3-trimethylammoniumchloride as the substituent) adsorbed from aqueous solutions (pH 7.5, added NaCl 0, 1, 100, and 500 mM) on silica were studied with a quartz crystal microbalance with dissipation (QCM-D). Three different starches were(More)
Suspensions of calcium carbonate in water with an indifferent background electrolyte (NaCl) have been investigated using several techniques. Particular attention was paid to the dissolution of calcite at equilibrium and as a function of sodium polyacrylate (NaPA) concentration. Also of interest was how this affects the magnitude of the surface charge and(More)
The stability and oxidation of copper nanoparticles stabilized with various ligands have been studied. Lauric acid-capped copper nanoparticles were prepared by a modified Brust-Schiffrin method. Then, ligand exchange with an excess of different capping agents was performed. Oxidation and stability were studied by UV-vis, XRD, and TEM. Alkanethiols and oleic(More)
The origin of the surface potential of calcium carbonate in aqueous dispersions and the dissolution of calcite in systems containing excess Ca(2+) and CO(3)(2-) have been the subjects of this study. In addition, stabilization of calcite particles with an anionic polyelectrolyte (sodium polyacrylate (NaPA)) and the effect on surface potential and dissolution(More)
The structure of lyotropic liquid crystalline or gellike phases formed in cationic starch (CS)/ anionic surfactant/water systems in the temperature range 25-80 °C has been investigated by smallangle X-ray scattering. The surfactants were sodium dodecyl sulfate (SDS), sodium decanoate (NaDe), sodium dodecanoate (NaDod), sodium palmitate (NaPal), sodium(More)
At least 10% of inhabitants in the Czech Republic are supplied with water from private sources (private wells, boreholes). With the increasing cost of water, the number of people using their own sources of drinking water will be likely to increase. According to the Decree of the State Office for Nuclear Safety about the Radiation Protection 307/2002 as(More)
Aqueous solutions of sodium alkanoates (C7H15COONa, NaOct; C9H19COONa, NaDe; C11H23COONa NaDod; C15H31COONa, NaPal) and mixtures of NaPal with NaDod, NaDe, and NaOct, as well as complexes formed by these surfactants with cationic potato starch (CS), were investigated by small-angle neutron scattering (SANS). The results indicate that mixed NaPal/NaDod(More)
Water is one of the most important resources for a human being; therefore, its quality should be properly tested. According to Council Directive No. 2013/51/EUROATOM, there shall be established requirements for the general public health protection with regard to radioactive substances in water intended for human consumption. This article summarises(More)
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