6533b851fe1ef96bd12a97ce
RESEARCH PRODUCT
Study of water adsorption and capillary bridge formation for SiO(2) nanoparticle layers by means of a combined in situ FT-IR reflection spectroscopy and QCM-D set-up.
C. KunzeChao ZhangBoray TorunGuido GrundmeierThomas D. Kühnesubject
Absorption spectroscopyChemistryCapillary actionPolymersSurface PropertiesAnalytical chemistryGeneral Physics and AstronomyWaterQuartz crystal microbalanceDissipationSilicon DioxideAdsorptionMonolayerSpectroscopy Fourier Transform InfraredQuartz Crystal Microbalance TechniquesNanoparticlesRelative humidityAdsorptionPhysical and Theoretical ChemistryFourier transform infrared spectroscopyParticle Sizedescription
Water adsorption and capillary bridge formation within a layer of SiO2-nanoparticles were studied in situ by means of a combination of quartz crystal microbalance (QCM-D) with dissipation analysis and Fourier transformation infrared reflection absorption spectroscopy (FT-IRRAS). FT-IR data were employed to distinguish the “ice-like” and “liquid-like” contributions and to support the analysis of the QCM-D data concerning mass change and dissipation. Combined measurements show that for SiO2-nanoparticles with a diameter of about 250 nm, the formation of two adsorbed monolayers of water as well as bulk water leads to a rather linear increase in the dissipation for relative humidity values of up to 60% which is followed by a strong increase in dissipation during the actual liquid bridge formation. Subsequently, the dissipation drops again when the relative humidity is further increased to values >90%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-02-24 | Physical chemistry chemical physics : PCCP |