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  • 1.
    Carmona, Pierre
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.
    Poulsen, Jens
    Wendelsbergs beräkningskemi AB, Sweden.
    Westergren, Jan
    Wendelsbergs beräkningskemi AB, Sweden.
    Nilsson Pingel, Torben
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Röding, Magnus
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.
    Lambrechts, Eileen
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Ghent University, Belgium.
    De Keersmaecker, Herlinde
    Ghent University, Belgium.
    Braeckmans, Kevin
    Ghent University, Belgium.
    Särkkä, Aila
    Chalmers University of Technology, Sweden.
    von Corswant, Christian
    AstraZeneca, Sweden.
    Olsson, Eva
    Chalmers University of Technology, Sweden.
    Loren, Niklas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.
    Controlling the structure of spin-coated multilayer ethylcellulose/hydroxypropylcellulose films for drug release.2023In: International Journal of Pharmaceutics, ISSN 0378-5173, E-ISSN 1873-3476, Vol. 644, article id 123350Article in journal (Refereed)
    Abstract [en]

    Porous phase-separated ethylcellulose/hydroxypropylcellulose (EC/HPC) films are used to control drug transport out of pharmaceutical pellets. Water-soluble HPC leaches out and forms a porous structure that controls the drug transport. Industrially, the pellets are coated using a fluidized bed spraying device, and a layered film exhibiting varying porosity and structure after leaching is obtained. A detailed understanding of the formation of the multilayered, phase-separated structure during production is lacking. Here, we have investigated multilayered EC/HPC films produced by sequential spin-coating, which was used to mimic the industrial process. The effects of EC/HPC ratio and spin speed on the multilayer film formation and structure were investigated using advanced microscopy techniques and image analysis. Cahn-Hilliard simulations were performed to analyze the mixing behavior. A gradient with larger structures close to the substrate surface and smaller structures close to the air surface was formed due to coarsening of the layers already coated during successive deposition cycles. The porosity of the multilayer film was found to vary with both EC/HPC ratio and spin speed. Simulation of the mixing behavior and in situ characterization of the structure evolution showed that the origin of the discontinuities and multilayer structure can be explained by the non-mixing of the layers.

  • 2.
    Niimi, Jun
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Ahlinder, Astrid
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Nilsson Pingel, Torben
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Niimi, Claudia
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Höglund, Evelina
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Öhgren, Camilla
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Loren, Niklas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Nielsen, Tim
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Saltiness enhancement: Impact of acid added to bread with heterogeneously distributed sodium chloride2023In: Lebensmittel-Wissenschaft + Technologie, ISSN 0023-6438, E-ISSN 1096-1127, Vol. 176, article id 114557Article in journal (Refereed)
    Abstract [en]

    The current global sodium consumption exceeds recommended daily intakes and there is a great need to reduce the sodium content in foods for a healthier society. The current study investigated the effect of combining sensory interaction principles and heterogeneous distribution of NaCl in bread on sensory properties, structure, and NaCl distribution. Breads were prepared in three different arrangements of NaCl distribution: homogenous, layered, and layered with lactic acid. Within each arrangement, four NaCl levels were tested. The breads were evaluated by a sensory panel for perceived saltiness, sourness, and qualitative texture, measured for stiffness, and the NaCl distribution was determined by X-ray fluorescence microscopy (XFM). Perceived saltiness was significantly enhanced in breads beyond heterogeneous NaCl distribution when lactic acid was added. Stiffness measurements were affected by layering of bread, the layers without NaCl were stiffer with an increase in overall salt concentration. The heterogeneous distribution of NaCl in layered breads could be visualised by XFM and textural consequences of layering bread are discussed. The current study demonstrates the potential of combining principles of pulsation of taste and sensory interactions together to enhance salt perception, and hence suggesting the approach as a possible further strategy for NaCl reduction in bread.

  • 3.
    Rudolph-Schöpping, Gregor
    et al.
    Lund University, Sweden; LINXS Institute of Advanced Neutron and X-ray Science, Sweden.
    Larsson, Emanuel
    Lund University, Sweden; LINXS Institute of Advanced Neutron and X-ray Science, Sweden.
    Nilsson Pingel, Torben
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Guizar-Sicairos, Manuel
    Paul Scherrer Institute, Switzerland; École Polytechnique Fédérale de Lausanne, Switzerland.
    Villanueva-Perez, Pablo
    Lund University, Sweden.
    Hall, Stephen
    Lund University, Sweden; LINXS Institute of Advanced Neutron and X-ray Science, Sweden.
    Lipnizki, Frank
    Lund University, Sweden; LINXS Institute of Advanced Neutron and X-ray Science, Sweden.
    Towards multiscale X-ray tomographic imaging in membrane science — A perspective2024In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 690, article id 122245Article in journal (Refereed)
    Abstract [en]

    Tomographic X-ray imaging techniques offer novel opportunities for studying membranes and membrane processes in 3D on a spatial resolution not seen before. Traditional 2D imaging techniques used to characterise membranes have limitations that can be overcome by tomographic X-ray imaging. Tomographic X-ray imaging can provide information in 2D/3D or 4D (3D plus time) on membranes, membrane modules, and membrane processes on a scale ranging from micro- to nanometre. They offer the possibility to uncover many fundamental issues related to membrane science, including the detection and monitoring of macroscopic biofilm formation, scaling, and cake build-up. High-resolution nanotomographic X-ray imaging enables even microscopic characterisations such as pore size distribution or pore network analysis. This Perspective paper introduces the tomographic X-ray imaging techniques with the most potential for membrane science: microtomography, nanotomography, holotomography, and ptychotomography, and presents their applications in the literature regarding the field of membrane science. Based on these findings and our experiences opportunities, challenges, and limitations of tomographic X-ray imaging techniques are discussed. It is concluded that in the near future tomographic X-ray imaging techniques will become increasingly common analytical techniques for membrane manufacturers, scientists, and users. 

  • 4.
    Townsend, Philip
    et al.
    RISE Research Institutes of Sweden. Chalmers University of Technology, Sweden; University of Gothenburg, Sweden.
    Nilsson Pingel, Torben
    Chalmers University of Technology, Sweden.
    Loren, Niklas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.
    Gebäck, Tobias
    Chalmers University of Technology, Sweden; University of Gothenburg, Sweden.
    Olsson, Eva
    Chalmers University of Technology, Sweden.
    Särkkä, Aila
    Chalmers University of Technology, Sweden; University of Gothenburg, Sweden.
    Röding, Magnus
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden; University of Gothenburg, Sweden.
    Tessellation-based stochastic modelling of 3D coating structures imaged with FIB-SEM tomography2021In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 197, article id 110611Article in journal (Refereed)
    Abstract [en]

    To facilitate printing, coatings are typically applied to paperboard used for packaging to provide a good surface for application. To optimise the performance of the coating, it is important to understand the relationship between the microstructure of the material and its mass transport properties. In this work, three samples of paperboard coating are imaged using combined focused ion beam and scanning electron microscope (FIB-SEM) tomography data appropriately segmented to characterise the internal microstructure. These images are used to inform a parametric, tessellation-based stochastic three-dimensional model intended to mimic the irregular geometry of the particles that can be seen in the coating. Parameters for the model are estimated from the FIB-SEM image data, and we demonstrate good agreement between the real and virtual structures both in terms of geometrical measures and mass transport properties. The development of this model facilitates exploration of the relationship between the structure and its properties. © 2021 The Author(s)

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