| 1. |
- Andersson, N, et al.
(författare)
-
Combined emulsion and solvent evaporation (ESE) synthesis route to well-ordered mesoporous materials
- 2007
-
Ingår i: Langmuir. - 0743-7463 .- 1520-5827. ; 23:3, s. 1459-1464
-
Tidskriftsartikel (refereegranskat)abstract
- Control over morphology and internal mesostructure of surfactant templated silicas remains a challenge, especially when considering scaling laboratory syntheses up to industrial volumes. Herewereport a method combining emulsification with the evaporation-induced self-assembly (EISA) method for preparing spherical, mesoporous silica particles. This emulsion and solvent evaporation (ESE) method has several potential advantages over classic precipitation routes: it is easily scaled while providing superior control over stoichiometric homogeneity of templating surfactants and inorganic precursors, and particle sizes and distributions are determined by principles developed for manipulating droplet sizes within water-in-oil emulsions. To demonstrate the method, triblock copolymer P104 is used as a templating amphiphile, generating unusually well-ordered 2D hexagonal (P6mm) mesoporous silica, while particle sizes and morphologies were controlled by varying the type of emulsifier and the method for emulsification
|
|
| 2. |
- Andersson, N, et al.
(författare)
-
Photochromic mesostructured silica pigments dispersed in latex films
- 2005
-
Ingår i: Journal of Materials Chemistry. - 0959-9428 .- 1364-5501. ; 15:0149-2136, s. 3507-3513
-
Tidskriftsartikel (refereegranskat)abstract
- We have incorporated the photochromic dyes spiropyran and spirooxazine in surfactant templated mesostructured silica particles. Spherical inorganic–organic hybrid pigments with varying dye content were produced by a one-pot synthesis in an aerosol reactor where the internal mesostructure could be controlled. The mesostructured inorganic–organic hybrid pigments provide a mechanically and chemically rigid framework that protects the dyes and facilitate handling. We show that an organic latex binder can be used to prepare transparent photochromic films of varying thickness. Changing the dye loading in the pigments and the pigment content in the films provides a versatile route for tuning the photochromic response. The pigmented films show both fast and direct photochromism, where the decay time for thermal bleaching is very fast in the case of spirooxazine doped pigments (kSO= 0.094 s–1), being in the range of the best reported values for solid state composites.
|
|
| 3. |
- Sörensen, MH, et al.
(författare)
-
Control of internal (2D and 3D hexagonal) mesostructure and particle morphology of spherical mesoporous silica particles using the emulsion and solvent evaporation (ESE) method
- 2009
-
Ingår i: Microporous and Mesoporous Materials. - : Elsevier BV. - 1387-1811 .- 1873-3093. ; 120:3, s. 359-367
-
Tidskriftsartikel (refereegranskat)abstract
- In this study we demonstrate the opportunities controlling internal structure as well as exterior morphology of surfactant templated mesostructured materials through the newly developed emulsion and solvent evaporation (ESE) method. In particular, we consider the control of synthesis temperature and map the influence upon both internal structure and surface morphology of particles templated by the temperature sensitive Pluronic block copolymer F127. Furthermore, we vary compositions, by adding poly(propylene glycol) acting as a swelling agent, as well as by controlling the moisture content. Both of these are having an impact on the internal mesostructure as well as the pore size. Apart from probing internal structure by scattering techniques, the accessibility of the mesoscopic pores of these materials are investigated by measuring the adsorption of a cationic dye, Janus Green B, into the materials. This method shows that accessibility varies dramatically with internal structure. Further, by carefully controlling the moisture content when using the cationic surfactant C16TAB as template, a well ordered 3D hexagonal closed packed (P63/mmc) material with large surface area as well as pore volume was prepared. This further indicates the versatility of the new preparation technique.
|
|
| 4. |
- Wedin, P, et al.
(författare)
-
Surfactant-templated mesoporous silica as a pigment in inkjet paper coatings
- 2006
-
Ingår i: Journal of Pulp and Paper Science (JPPS). - 0826-6220. ; 32, s. 32-37
-
Tidskriftsartikel (refereegranskat)abstract
- The feasibility of a novel type of surfactant-templated mesoporous silica particles as pigments in inkjet paper has been evaluated. The surfactant-templated mesoporous silica pigments with small pores and narrow pore size distribution were investigated, and compared to a typical silica gel with larger pores and broader size distribution. The surfactant-templated pigments required significantly lower amounts of binder and gave improvements in colour richness and sharpness, relative to the silica gel pigment.
|
|
