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Enhanced UV protection and water adsorption properties of transparent poly(methyl methacrylate) films through incorporation of amorphous magnesium carbonate nanoparticles
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-5496-9664
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.ORCID iD: 0000-0003-4543-1130
(English)Manuscript (preprint) (Other academic)
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-354510OAI: oai:DiVA.org:uu-354510DiVA, id: diva2:1221577
Available from: 2018-06-20 Created: 2018-06-20 Last updated: 2019-01-21
In thesis
1. Amorphous magnesium carbonate nanomaterials: Synthesis, characterization and applications
Open this publication in new window or tab >>Amorphous magnesium carbonate nanomaterials: Synthesis, characterization and applications
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High surface-to-volume ratio materials, including nanoparticles and mesoporous materials, have a number of applications due to their large surface area and special structures. Traditional approaches for synthesizing high surface-to-volume ratio nanomaterials are often complicated, expensive or environmentally unfriendly. Considering aspects such as availability and safety in terms of environmental or biological contact, magnesium carbonate-based nanomaterials are an interesting and potentially valuable candidate for novel applications. The overall aim of this thesis was to develop novel high surface-to-volume ratio amorphous magnesium carbonate nanomaterials and investigating their possible applications.

Amorphous magnesium carbonate nanoparticles (AMN) were successfully synthesized via a simple and low-temperature pathway. The structure and resulting properties of the material can be tailored by changing the final steps in the synthesis process.

The ability of AMN to stabilize ibuprofen (IBU) in the amorphous state was investigated. Nanocomposites with IBU:AMN mass ratios as high as to 5:1 were shown to enhance the release rate of IBU in vitro by as much as 83 times compared to IBU in crystalline form. A related nanostructured material, mesoporous magnesium carbonate (MMC), was evaluated as a drug carrier for stabilizing amorphous drugs through the incorporation of the drug within its pores. In this study, MMC was used to release and sustain two poorly soluble drugs (tolfenamic acid and rimonabant) in the supersaturated state with the assistance of hydroxypropyl methylcellulose.

AMN was also used to synthesize a novel adhesive together with IBU without the addition of a polymer. This adhesive was transparent, self-healing, shapeable, stretchable and reusable. In addition, the adhesive was able to glue a variety of materials, including metals, glass, paper and plastics (even Teflon).

Finally, AMN was used to prepare flexible, transparent and UV-shielding films when incorporated into a PMMA matrix. These films exhibited both UV-shielding properties and moisture absorbance and retention abilities. In addition, the UV- and thermo-stability of these films were enhanced by the addition of AMN.

The work presented in this thesis show that the nanomaterials AMN and MMC possess great potential for an extremely broad range of applications, from pharmaceutical applications dealing with poorly soluble drugs to structural applications such as adhesives to applications in optics or electronics such as UV-shielding or moisture barrier films.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 82
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1685
Keywords
high surface-to-volume ratio, nanoparticles, mesoporous, magnesium carbonate, amorphous drugs, supersaturated concentration, general adhesives, UV-shielding
National Category
Nano Technology
Identifiers
urn:nbn:se:uu:diva-354512 (URN)978-91-513-0370-3 (ISBN)
Public defence
2018-09-07, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:25 (English)
Opponent
Supervisors
Available from: 2018-08-15 Created: 2018-06-20 Last updated: 2018-08-28
2. Angle dependent light scattering of functional nanoparticle composites
Open this publication in new window or tab >>Angle dependent light scattering of functional nanoparticle composites
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Varies functional nanoparticles play crucial roles in energy- and optical- related applications. The incorporation of functional nanoparticles into non-absorbing polymers to form optical absorption and scattering thin films have attracted considerable interest due to a successful selection of particles and matrices, synergistic effects of separation and fixation of particles, and controllable layer thicknesses and structures. To investigate the optical parameters, especially absorption and scattering coefficients of the nanocomposites, it is critical to evaluate and optimize those particle based functional layers.

In this thesis, we mainly focus on developing approaches for the inversion of scattering and absorption coefficients from optically measured transmittance and reflectance spectra. A two-flux radiative transfer model is robust for this purpose, but its limitation lies in failing to converge the transmittance and reflectance spectra to experimental data owing to the approximation of the completely diffuse scattering patterns. We carried out thorough characterization of angle- and wavelength-resolved light scattering on those nanocomposites with metallic Au, ferromagnetic Fe3O4 and photocatalytic TiO2 nanoparticles. We further developed an empirical scattering phase function, which can fully represent the scattering distributions for aggregated particles in the multiple scattering regime, as well as the single scattering in the Rayleigh, Mie and geometric optical scattering regimes. The incorporation of angle-resolved data into the two-flux theory to derive scattering and absorption coefficients have been validated using the functional nanoparticle composites. Several approximations are also proposed to obtain the scattering and absorption coefficients when angle resolved measurements were not available.

The optical performance was investigated on the nanocomposites mentioned above with varied sizes, shapes and concentrations using a spectrophotometer, an in-plane scatterometer and an out-of-plane goniometer. Single particle dark-field scattering spectra were also obtained for Au, Fe3O4, and TiO2 particles in the forward and backward directions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 89
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1767
Keywords
light scattering, nano particle, absorption, radiative transfer
National Category
Nano Technology
Research subject
Solid State Physics
Identifiers
urn:nbn:se:uu:diva-374319 (URN)978-91-513-0559-2 (ISBN)
Public defence
2019-03-08, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2019-02-11 Created: 2019-01-21 Last updated: 2019-02-19

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Yang, JiaojiaoWang, JunXinStrömme, MariaWelch, Ken

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