| 1. |
- Emmelin, L, et al.
(författare)
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Strandskyddet måste ändras för att behålla sin legitimitet
- 2019
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Ingår i: Dagens Nyheter. ; :8 juni 2019
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Strandskyddslagstiftningen ska enligt januariavtalet göras om i grunden. Strandskyddet bör uppdateras så att det har legitimitet hos breda grupper för att kunna finnas kvar på längre sikt. Men ett politiskt beställningsarbete utan ordentligt underlag riskerar att leda till mer problem.
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| 2. |
- Schaefer, Andreas, 1981, et al.
(författare)
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Defect-Induced Water Bilayer Growth on Anatase TiO2(101)
- 2018
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 1520-5827 .- 0743-7463. ; 34:37, s. 10856-10864
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Tidskriftsartikel (refereegranskat)abstract
- Preparing an anatase TiO2(101) surface with a high density of oxygen vacancies and associated reduced Ti species in the near-surface region results in drastic changes in the water adsorption chemistry compared to adsorption on a highly stoichiometric surface. Using synchrotron radiation excited photoelectron spectroscopy, we observe a change in the water growth mode, from layer-by-layer growth on the highly stoichiometric surface to bilayer growth on the reduced surface. Furthermore, we have been able to observe Ti3+ enrichment at the surface upon water adsorption. The Ti3+ enrichment occurs concomitant with effective water dissociation into hydroxyls with a very high thermal stability. The water bilayer on the reduced surface is thermally more stable than that on the stoichiometric surface, and it is more efficient in promoting further water dissociation upon heating. The results thus show how the presence of subsurface defects can alter the wetting mechanism of an oxide surface.
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| 3. |
- Schaefer, Andreas, 1981, et al.
(författare)
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First layer water phases on anatase TiO2(101)
- 2018
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Ingår i: Surface Science. - : Elsevier BV. - 0039-6028 .- 1879-2758. ; 674, s. 25-31
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Tidskriftsartikel (refereegranskat)abstract
- The anatase TiO2(101) surface and its interaction with water is an important topic in oxide surface chemistry. Firstly, it benchmarks the properties of the majority facet of TiO2 nanoparticles and, secondly, there is a controversy as to whether the water molecule adsorbs intact or deprotonates. We have addressed the adsorption of water on anatase TiO2(101) by synchrotron radiation photoelectron spectroscopy. Three two-dimensional water structures are found during growth at different temperatures: at 100 K, a metastable structure forms with no hydrogen bonding between the water molecules. In accord with prior literature, we assign this phase to chains of disordered molecules. Growth 160 K results in a metastable structure with expressed hydrogen bonding between the water molecules. At 190 K, the water molecules become disordered as the thermal energy is too high and hence the hydrogen bonds break. The result is a structure with isolated monomers. Partial dissociation is observed for all three growths, with the molecular state only slightly favored in energy (20–40 meV) over the dissociated state. Heating of a thick film leads to more dissociation compared to a bilayer, when formed at 100 K. Thus, extending the water network facilitates proton transport and hence dissociation. The results reconcile apparent conflicting experimental results previously obtained by scanning tunneling microscopy (STM) and core level photoelectron spectroscopy.
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