FILMMOLECSTRUCT · Molecular Structure in Thin Wetting Films
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2009-04-01 → 2012-03-31
- Финансиране от ЕС
- 45 000 €
- Участници
- 1
- Схема
- MC-ERG
Линиите свързват координатора с партньорите.
Накратко на български
Молекулярната структура на тънки течни слоеве между газ и твърда повърхност се анализира чрез измерване на сили и спектроскопия. Това помага за разбирането на процеси като почистването на повърхности, флотацията на минерали и коагулацията на колоидни дисперсии.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Molecular Structure in Thin Wetting Films
The aim of this project was to obtain molecular information on the structure of thin liquid films confined between a gas and solid interface, as an effort to relate macroscopic measurable parameters, such us disjoining pressures, to structural properties at the molecular level (Figure 1). The approach consisted in combining an apparatus capable of accurately measuring interfacial forces in wetting films (air/liquid/solid) with state of the art surface specific vibrational spectroscopic techniques. Wetting films play a crucial role in the understanding of many practical applications, including mineral flotation, surface cleaning processes, and the coagulation of colloidal dispersions. The stability of these films depends on the molecular interactions between the two interfaces which macroscopically manifest themselves as surface forces. The measurement of these forces, in particular using the thin film pressure balance (TFPB) apparatus, has provided valuable insight in the identification of the different types of interactions, which could be of electrostatic, dispersive, steric and/or structural nature, just to mention a few. Nonetheless, the link between the measured forces and the molecular origin of these interactions remains elusive, as force measurements provide no direct chemical, structural or conformation information, which are expected to change significantly in confined geometries. In this sense vibrational spectroscopic techniques, in particular those sensitive to molecules at interfaces can provide an important part of the puzzle: chemical and orientation molecular information. Recent advances in vibrational spectroscopic techniques allow collection of unprecedented information from molecules at interfaces. In this category Vibrational Sum Frequency Spectroscopy (VSFS) has emerged as an invaluable tool. The intrinsic surface specificity of VSFS distinguishes molecules at the interface from a vast excess of the same molecules present in the bulk, even at a submonolayer coverage. Moreover, current developments in conventional Raman scattering, in particular when using a Total Internal Reflection (TIR) geometry, have demonstrated that submonolayer sensitivity is achievable and that it can also be used to determine the conformation of surface molecules.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The proposed project intends to obtain a molecular insight into the order and structure of thin wetting films (solid/liquid/gas) as an effort to relate molecular properties to macroscopic measureable parameters such as surface forces and contact angles. The approach will consist in combining two powerful surface sensitive vibrational spectroscopic techniques (Vibrational Sum Frequency and Total Internal Reflection Raman spectroscopies) with an apparatus capable of measuring the forces exerted between these asymmetric surfaces as a function of distance (Thin Film Pressure Balance). VSFS is intrinsically surface specific probing the first few monolayers and detecting only molecules with a preferred orientation. Conversely, TIR Raman probes deeper into the bulk (~100 nm), but detects all molecules making these two techniques complementary. Results will provide unique information on the structural changes in nanometer confined geometries of i) pure water films, ii) surfactant and polymer stabilized films and iii) biophysical relevant surfaces (planar supported lipid bilayers). The project will involve close collaboration between two research groups in Europe (Germany and England), and will help developing the applicant’s independent research skills during his period of reintegration. The applicant’s unique experience in surface vibrational spectroscopy and molecules under confinement, learnt particularly during his previous Marie Curie fellowship, will be decisive in the successful implementation of this challenging project.
Оригинален текст от CORDIS (на английски).
Участници
- KUNGLIGA TEKNISKA HOEGSKOLAN · StockholmКоординаторШвеция
Връзки
Данни: CORDIS, © Европейски съюз