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- W1977237703 abstract "A new method for the determination of liquid densities with a surface-modified 5-MHz quartz crystal microbalance (QCM) is described. Modifier is a thin mesoporous TiO2 film coated on the crystal of the QCM (50 < porosity (P) < 70%; 0.1 < film thickness (dT) < 6.0 μm). Modification is accompanied by a resonant frequency shift (1 < ΔfT < 60 kHz) reflecting the TiO2 film thickness (dT), its porosity (P), and the density of the nanocrystals (ρT). Immersion of the QCM in a liquid of density ρl leads to a further resonant frequency shift (Δfl) of 0.8−40 kHz depending mainly on dT, P, and ρl. The liquid in the pores behaves as a rigid mass. In the case of thick films, the contribution from the bulk of the film to Δfl is so important that surface phenomena related to the viscosity of the solvent and to the roughness of the film/liquid interface become negligible; i.e., a crystal with a 6-μm TiO2 film can be used to measure the density of a liquid of unknown viscosity with an average error of ±0.02 g/cm3. Model considerations lead to the differential dΔfl/dΔfT = ρlP/ρT(100 − P); i.e., the accurate solvent density becomes available from Δfl differentiated with respect to ΔfT without any interference from viscosity and surface roughness. Experimentally, an average error of ±0.005 g/cm3 was observed. Scope and limits of the new technique are presented." @default.
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- W1977237703 date "1999-07-09" @default.
- W1977237703 modified "2023-10-14" @default.
- W1977237703 title "Liquid Density Response of a Quartz Crystal Microbalance Modified with Mesoporous Titanium Dioxide" @default.
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- W1977237703 doi "https://doi.org/10.1021/ac9903813" @default.
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