Speed of sound data for dilute aqueous solutions of one
monohydric
alcohol (2,2-dimethylpropane-1-ol), five polyhydric alcohols (2-methylpropane-1,3-diol,
2,2-dimethylpropane-1,3-diol, 2,2-bis(hydroxymethyl)propane-1-ol,
2,2-bis(hydroxymethyl)propane-1,3-diol, 2,2-bis(hydroxymethyl)butane-1-ol),
and one ether alcohol (3,3,7,7-tetrakis(hydroxymethyl)-5-oxanonane)
were obtained using the Anton Paar DSA 5000 vibrating-tube densimeter
and sound analyzer in the temperature range from (278.15
to 318.15) K and at atmospheric pressure. Standard molar isentropic
compressions were evaluated from the measured data. Measured densities
of dilute aqueous solutions of 2,2-dimethylpropane-1,3-diol and 2,2-bis(hydroxymethyl)propane-1,3-diol
are also presented along with the standard molar volumes of these
two solutes calculated from the measured data. Relations between the
two standard quantities and molecular structures of the solutes are
discussed.
Density data for dilute aqueous solutions of four aliphatic alcohols (2,2-dimethylpropane-1-ol, 2-methylpropane-1,3-diol, 2,2-bis(hydroxymethyl)propane-1-ol, 2,2-bis(hydroxymethyl)butane-1-ol) and one ether alcohol (3,3,7,7-tetrakis(hydroxymethyl)-5-oxanonane) were obtained using both the Anton Paar DSA 5000 vibrating-tube densimeter and the laboratory-made flow densimeter. They are presented together with partial molar volumes at infinite dilution (standard molar volumes) calculated from the measured data. The measurements were performed at temperatures T = (278 to 573) K and at pressures up to p = 30 MPa. Trends in homologous series are discussed, and the group additivity scheme proposed recently is applied to the solutes investigated.
Silicon oxynitride layers have been widely used to tailor the optical performance and mechanical resistance of multilayer optical coatings. The key issue for their reliable large‐scale application on a glass substrate is the effect of technological parameters on their performance. Here we report on the interrelationship between the conditions of the reactive magnetron deposition process and composition, structure and in turn optical and mechanical properties. The process gas composition and pressure level exhibit a strong influence on the film properties, whereas only moderate effect of magnetron power was observed. The O/(O+N) ratio of the films changes from 0.33 to 0.90 and the film density varies between 2.66 g.cm−3 and 1.85 g.cm−3 along with the increase in the process gas pressure from 0.58 Pa to 1.02 Pa. The refractive index shifts between 1.81 and 1.48 and the residual stress of the film varies in the range from compressive (−385 MPa) to tensile (26 MPa). Hardness and reduced modulus follow the same trend and decline with the increase in process pressure from 12.1 GPa to 2.1 GPa and from 120.3 to 31.6 GPa, respectively. The abrasive wear resistance decreases with the nitrogen content in the films.
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