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Four different cationic surfactants were allowed to adsorb on boron nitride (BN) over the pH range of 5.5 to 8 in separate experiments. The authors talk about the orientation of the surfactant relative to the BN particles. The use of these surfactants has changed the partial ionic surface of BN to a hydrophobic surface, which also led to an increase in thermal conductivity and more favourable mechanical properties....
Since there was no literature on using the transient plane source method for the measurement of thermal conductivity and diffusivity of food products the authors did it themselves. They tested a variety of products including water, mineral oil, ethanol, beef, chicken and apples and determined that using the transient plane source method to simultaneously measure thermal conductivity and diffusivity was an accurate method....
This article outlines the effect of adding Al2O3 and Cu nanoparticles to water and measuring the thermal conductivities and viscosities of the mixtures. The effect of pH was taken into account and it was found that there are optimal pH values for each of the nanoparticle mixtures that give the highest thermal conductivities and lowest viscosities. Research shows that thermal conductivity and viscosity are closely related to each other. ...
This study looks at the effects of pH on heat transfer, among other things, of nanofluids. Over 20% enhancement of thermal conductivity was noted with nanofluids containing 3wt% zirconium dioxide and titanium dioxide. Also noted, was the influence of pH on the stability of the nanofluids. The Derjaguin-Landau-Verwey-Overbeek theory states that nanoparticles become unstable, form clusters and precipitate, when their pH is near the isoelectric point. This leads to large clusters ...
