Periodica Polytechnica Chemical Engineering 

About: Periodica Polytechnica Chemical Engineering is an academic journal published by Budapest University of Technology and Economics. The journal publishes majorly in the area(s): Chemistry & Catalysis. It has an ISSN identifier of 0324-5853. It is also open access. Over the lifetime, 1033 publications have been published receiving 6049 citations. The journal is also known as: Periodica polytechnica. Chemisches Ingenieurwesen & Periodica polytechnica. Himiâ.

Phytic acid content of cereals and legumes and interaction with proteins

Abstract: Phytic acid content of wheat, maize, barley, oats, soybean, cowpea, common bean, lupin and pea samples grown in Hungary were measured. In addition interaction of phytic acid with some isolated proteins has been studied. Legumes had a higher phytic acid content (max. 1.75 g/100 g) and the cereals a lower one (max. 1.42 g/100 g). The minimal value has been measured in durum wheat sample (0.52 g/100 g). Soy glycinin and sunflower seed globulin interacted with the highest quantity of phytic acid and gluten proteins with the lowest one. The protein-phytic acid interaction is highly dependent on pH.

pH-dependent surface charging of metal oxides

Abstract: Aqueous dispersions of metal oxide particles are of great practical interest due to their wide-ranging industrial applications and everyday uses under the conditions required. The latter involves the broad variability of pH and dissolved materials among them electrolytes which have definite role in charge neutralization in the vicinity of particle surface. In this work, the pH-dependent surface charging of metal oxides due to the specific adsorption of H + /OH - in the presence of indifferent and specific ions, and other simultaneous processes at solid/water interface such as hydration of surface, dissociation of surface sites, dissolution of solid matrix, then hydrolysis of dissolved ions are discussed. The governing role of solid particles will be showed by means of characteristic examples of aluminum, iron, titanium and zinc oxides, which have significant differences in chemical properties considering e.g., their pH-dependent dissolution and the speciation of dissolved ions.

Boiling Thermal Performance of TiO2 Aqueous NanoFluids as a Coolant on a Disc Copper Block

Abstract: This work focuses on potential application of nano-fluids in cooling of high heat flux surfaces. For this purpose, experimental studies have been performed to quantify the heat transfer coefficient of Titana (TiO2) aqueous nano-fluids under different operating conditions. Boiling mechanism is established on a disc copper made heater at different heat flux, mass concentration of nano-fluids and sub-cooling temperatures. Results demonstrated that heat transfer coefficient of Titana nano-fluids are relatively higher than that of the base fluid. Heat and mass concentration of nano-particles can intensify the pool boiling heat transfer coefficient, while sub-cooling temperature can only have impacts on bubble formation. Also, visual study demonstrates that fouling formation of nano-particles can intensify the bubble transport due to the intensification of nucleation sites in the boiling surface.