Showing papers by "László Trif published in 2016"
TL;DR: In this paper, a silica-coated porous polymer beads was used to prevent the leakage of phase change materials (PCMs) for latent heat storage, which achieved a melting and crystallizing enthalpies were 132.6 and 133.4 J/g, respectively.
42 citations
01 Jan 2016
TL;DR: In this paper, a review of anti-bio-fouling coatings used for naval applications is presented, with an emphasis on its drawbacks and the plants and animals involved in the fouling.
Abstract: This chapter deals with traditional and special anti-biofouling coatings used for naval applications. The description starts with the definition of biofouling with an emphasis on its drawbacks and the plants and animals involved in the fouling. After illustration of the undesired action of micro- and macroorganisms, a historical retrospection of antifouling techniques is given. This is followed by a full description of coatings with and without biocides that illustrate those methods when the undesired activity of the organisms is inhibited either by killing them, or repelling from the surfaces that sink in natural waters. Examples are given for polymers, which are able to repel organisms alone or with biocides incorporated, and inorganic and organic additives are introduced as antifouling chemicals. An important section closes the chapter where the most environmentally friend resolutions, i.e., the quorum quenching techniques are discussed.
34 citations
TL;DR: In this paper, the microspheres were loaded with paraffin and cetyl alcohol phase change materials (PCMs) and coated with silica by sol-gel method using trimethoxy(methyl)silane hydrolysate.
9 citations
TL;DR: In this paper, spherical agglomerates of aluminium potassium sulfate dodecahydrate (potash alum dodecaphydrate), a highly water soluble material, were produced by spherical crystallization technique in four different solvent systems.
Abstract: Salt hydrates are low-cost, readily available PCMs (phase change materials). As a core material for encapsulation the salt agglomerates can be prepared by spherical agglomeration, a well-known method to produce drug loaded microspheres in the pharmaceutical industry, but not used for PCM formulation. The two basic mechanisms in spherical crystallization are spherical agglomeration (SA) and the quasi emulsion solvent diffusion (QESD) processes. The spherical agglomerates of aluminium potassium sulfate dodecahydrate (potash alum dodecahydrate), a highly water soluble material, were produced by spherical crystallization technique in four different solvent systems. In water (good solvent)–ethanol–dichloromethane (poor solvent) ternary solvent system the agglomeration takes place by the SA mechanism. In water–ethanol–n-hexane, water–ethanol and water–isopropyl alcohol solvent systems spherical particles were produced by the QESD method. Both procedures were proved to be feasible for the preparation of spherical salt hydrate particles as core material for microencapsulation. This method gives important basis to produce phase change materials from suitable salt hydrates. The potash alum content in the spherical agglomerates was analysed by conductivity and thermogravimetric measurements and their composition by XRD. Volume weighted mean diameters (D(4,3)) of the microparticles were 66 μm, 79 μm, 89 μm, and 684 μm formed in water–ethanol–n-hexane, water–ethanol, water–isopropyl alcohol, and water–ethanol–dichloromethane solvent system, respectively. Potash alum dodecahydrate is a double salt. Due to its different solubility in the four different solvent systems it crystallized out not only as potash alum, but also in other salt forms. The enthalpy changes of spherical agglomerates produced from different solvent systems were increased proportionally with potash alum contents.
9 citations