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Quartz crystal microbalance titanium sensor with mesoporous pores
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The quartz crystal microbalance (QCM) is an effective tool for the surface study in real time. But mesoporous coating materials usually is thin layer and stick to the substrates, and its properties cannot be studied by conventional methods as other mesoporous materials. A new QCM sensor with mesoporous pores is expected. The new mesoporous QCM sensor has mesoporous titania coating with 200 nm thickness only on the active electrode side by the method with masking counter electrode side during dip-coating. The new mesoporous QCM sensor works well in Q-Sense E1 equipment.

National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-120541OAI: oai:DiVA.org:su-120541DiVA: diva2:853244
Available from: 2015-09-11 Created: 2015-09-11 Last updated: 2016-02-17Bibliographically approved
In thesis
1. The synergistic role of hierarchical macro- and mesoporous implant surface and microscopic view of enhanced osseointegration
Open this publication in new window or tab >>The synergistic role of hierarchical macro- and mesoporous implant surface and microscopic view of enhanced osseointegration
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The trend for designing of a titanium implant explored using different chemical compositions and crystallinity materials until people realized that the implant surface character was another important factor affecting the rate and extent of osseointegartion. Titanium received a macroporous titania surface layer by anodization, which contains open pores with average pore diameter around 5μm. An additional mesoporous titania top layer was created that followed the contour of the macropores and having 100–200 nm thickness and a pore diameter of 10 nm. Thus, a coherent laminar titania surface layer was obtained producing a hierarchical macro- and mesoporous surface. The interfacial bonding between the surface layers and the titanium matrix was characterized by a scratch test that confirmed a stable and strong bonding of the laminar titania surface layers upon titanium. The wettability to water and the effects on the osteosarcoma cell line (SaOS-2) proliferation and mineralization of the formed titania surface layers were studied systematically by cell culture and scanning electron microscopy (SEM). A synergistic role of the hierarchical macro- and mesoporosities was revealed in terms of enhancing cell adhesion, proliferation and mineralization, when compared with the titania surface with solo porosity scale topography.

For the in vivo results of the evaluation of osseointegration, an argon ion beam polishing technique was applied to prepare the cross sections of implants feasible for the high resolution SEM investigation. The interfacial microstructure between newly formed bone and implants with four modified surfaces including the new hierarchical macro- and mesoporous implant surface retrieved after in vivo tests were characterized. By this approach it has become possible to directly observe early bone formation, the increase of bone density, and the evolution of bone structure. The two bone growth mechanisms, distant osteogenesis and contact osteogenesis, can also be distinguished. These direct observations give, at microscopic level, a better view of osseointegration and explain the functional mechanisms of various implant surfaces for osseointegration.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry, Stockholm University, 2015. 61 p.
Keyword
Porosity, cell adhesion, cell proliferation, surface topography, implant, bone-implant interface, argon ion beam polishing, osteogenesis, osseointegration
National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
urn:nbn:se:su:diva-120584 (URN)978-91-7649-267-3 (ISBN)
Public defence
2015-10-22, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: In press. Paper 4: Manuscript.

Available from: 2015-09-30 Created: 2015-09-14 Last updated: 2015-09-15Bibliographically approved

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