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  • 1.
    Andersson, N
    et al.
    YKI – Ytkemiska institutet.
    Alberius, PCA
    YKI – Ytkemiska institutet.
    Pedersen, JS
    Bergström, L
    YKI – Ytkemiska institutet.
    Structural features and adsorption behaviour of mesoporous silica particles formed from droplets generated in a spraying chamber2004In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 72, p. 175-183Article in journal (Refereed)
    Abstract [en]

    Spherical mesoporous particles have been produced by spraying hydrolysed alkoxide solutions containing templating amphiphilic molecules. The modified spray drying method produces up to 10 g/h of spherical non-hollow particles with a size of 1–5 m. Transmission electron microscopy and X-ray diffraction showed that well ordered internal 2D hexagonal mesostructures could be prepared using both nonionic block copolymers and cationic surfactants as the templating molecules. Disordered cubic and well ordered lamellar, onion like, particles were prepared from the block copolymer templates. Nitrogen sorption data and mercury porosimetry show that pore size distribution of the mesoporous particles is very narrow with pore sizes varying from 2.5 to 8.5 nm as a function of templating amphiphiles. We have shown that the mesoscopic pores are accessible after calcination and can be filled with relatively large molecules; the particles adsorbed more than 20% (by weight) of the cationic dye Janus Green B from aqueous solutions.

  • 2. Hussami, Linda L
    et al.
    Corkery, Robert W
    YKI – Ytkemiska institutet.
    Kloo, Lars
    Study of [Dy(eta(6)-p-xylene)(GaCl4)(3)]-incorporated polyhedral silica nanofoam2010In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 132, no 3, p. 480-486Article in journal (Refereed)
    Abstract [en]

    Preparation and characterization of organometallic dysprosium complex embedded polyhedral silica nanofoam (PNE-SiO2) is reported. The nanoporous solid was obtained via a sol-gel process involving precipitation of polymer micelles, hydrolysis and condensation of silica by swelling of triblock copolymer template micelles of PEO-PPO-PEO at acidic pH using high oil concentration and fast stirring. Metal-complex incorporation was performed via wet impregnation (WI) at higher temperature, where the dysprosium complex is chemically bound to the silanol groups of the silica foam surface. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) revealed that the particles of the organometallic complex are evenly distributed on the walls of the polyhedral cells, while nitrogen adsorption/desorption measurements (BET) verified that the characteristic meso- and macrocell structure of PNE-SiO2 composed of polyhedral cells of silica joined at mesosized windows are preserved also after incorporation.

  • 3.
    Sörensen, MH
    et al.
    YKI – Ytkemiska institutet.
    Corkery, RW
    YKI – Ytkemiska institutet.
    Skov Pedersen, J
    Rosenholm, J
    Alberius, PC
    YKI – Ytkemiska institutet.
    Expansion of the F127-templated mesostructure in aerosol-generated particles by using polypropylene glycol as a swelling agent2008In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 113, p. 1-13Article in journal (Refereed)
    Abstract [en]

    Expansion of the mesostructure in aerosol generated particles was performed through incorporation of polypropylene glycol (PPG), a non-volatile swelling agent. TEOS was used as silica source and the Pluronic block copolymer, F127, as template. The ratio of TEOS to F127 was kept constant during synthesis, while varying the weight ratio of PPG to F127 systematically. The impact of the PPG on the expansion of the structure was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen adsorption. Different methods were used to calculate the pore size distributions, the BJH, the BdB-FHH, the KJS and the NLDFT method. Simple geometrical models of the expansion were derived to interpret the experimental data and establish their accuracy. Experimental data showed a roughly linear expansion of the unit cell and pore size, consistent with that expected by modelling the swelling of a hexagonal (p6mm) structure assuming constant wall thickness. The expansion is increasing as a function of increasing PPG/F127 ratio by about 25 Å. An expression of the density of the silica wall was calculated from the models resulting in a density of 1.95±0.2 g/cm3. At a PPG/F127 ratio of approximately 0.31, the p6mm structure (found at lower PPG/F127 ratios) transforms to a microemulsion-templated foam structure. At an even higher PPG/F127 ratio (0.63-1.56), phase separation of the oil from the swollen template occurred, yielding a two-phase system of coexisting foam and large vesicles.

  • 4.
    Sörensen, MH
    et al.
    YKI – Ytkemiska institutet.
    Zhub, J
    Corkery, RW
    YKI – Ytkemiska institutet.
    Haywardh, RC
    Alberius, P
    YKI – Ytkemiska institutet.
    Control of internal (2D and 3D hexagonal) mesostructure and particle morphology of spherical mesoporous silica particles using the emulsion and solvent evaporation (ESE) method2009In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 120, no 3, p. 359-367Article in journal (Refereed)
    Abstract [en]

    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.

  • 5.
    Williamson, Nathan H.
    et al.
    University of South Australia, Australia.
    Röding, Magnus
    RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience. University College London, Australia.
    Liu, Huabing
    Victoria University of Wellington, New Zealand; Limecho Technology Limited Company, China.
    Galvosas, Patrick
    Victoria University of Wellington, New Zealand.
    Miklavcic, Stanley J.
    University of South Australia, Australia.
    Nydén, Magnus
    University of South Australia, Australia; University College London, Australia.
    The pseudo 2-D relaxation model for obtaining T1-T2 relationships from 1-D T1 and T2 measurements of fluid in porous media2018In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 269, p. 191-194Article in journal (Refereed)
    Abstract [en]

    NMR spin-lattice (T1) and spin-spin (T2) relaxation times and their inter-relation possess information on fluid behaviour in porous media. To elicit this information we utilize the pseudo 2-D relaxation model (P2DRM), which deduces the T1-T2 functional relationship from independent 1-D T1 and T2 measurements. Through model simulations we show empirically that the P2DRM accurately estimates T1-T2 relationships even when the marginal distributions of the true joint T1-T2 distribution are unknown or cannot be modeled. Estimates of the T1:. T2 ratio for fluid interacting with pore surfaces remain robust when the P2DRM is applied to simulations of rapidly acquired data. Therefore, the P2DRM can be useful in situations where experimental time is limited.

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