Surface Structure

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Lars Järnström - One of the best experts on this subject based on the ideXlab platform.

Alexandra Wallström - One of the best experts on this subject based on the ideXlab platform.

Kelvin Wang - One of the best experts on this subject based on the ideXlab platform.

  • femtosecond laser induced periodic Surface Structure on diamond film
    Applied Physics Letters, 2003
    Co-Authors: Qihong Wu, Rongchuan Fang, Qingxuan Yu, Yuan Liao, Xiangli Chen, Kelvin Wang
    Abstract:

    We report the laser-induced periodic Surface Structure (LIPSS) with periodicity about a quarter of the laser wavelength on unpolished diamond film treated by a P-polarized femtosecond laser. The short period LIPSS is parallel to the laser polarization and independent on the incidence angle. The LIPSS perpendicular to the laser polarization with periodicity shorter than a third of the laser wavelength slightly dependent on the incidence angle is also observed as well as the LIPSS perpendicular to the laser polarization with periodicity dependent on the incidence angle. The results are explained by interference of the incident laser and Surface scattered wave related to the excited electrons during laser interactions with diamond, being in excellent agreement with a previously developed theory.

Rolf Juergen Behm - One of the best experts on this subject based on the ideXlab platform.

  • Controlled Surface Structure for In Situ ATR-FTIRS Studies Using Preferentially Shaped Pt Nanocrystals
    Electrocatalysis, 2011
    Co-Authors: Sylvain Brimaud, Zenonas Jusys, Rolf Juergen Behm
    Abstract:

    We explored the possibility of using preferentially shaped Pt nanocrystals deposited on a gold film for in situ Fourier transform infrared spectroscopy (FTIRS) studies in an attenuated total reflection (ATR) configuration as Pt electrodes with a well-defined ordered Surface Structure. Hydrogen region voltammograms as well as characteristic bands of adsorbed CO and (bi) sulfate resolve Surface Structure-specific features consistent with previously published infrared reflection absorption spectroscopic studies on similarly Structured low index single crystalline Pt electrodes, supporting the validity of this approach.

Huipin Yuan - One of the best experts on this subject based on the ideXlab platform.

  • The role of calcium phosphate Surface Structure in osteogenesis and the mechanisms involved.
    Acta Biomaterialia, 2020
    Co-Authors: Dongqin Xiao, Jingwei Zhang, Davide Barbieri, Lorenzo Moroni, Huipin Yuan, Chengdong Zhang, Gang Feng
    Abstract:

    Calcium phosphate (CaP) ceramics have been widely used for bone regeneration because of their ability to induce osteogenesis. Surface properties, including chemical composition and Surface Structure, are known to play a crucial role in osteoconduction and osteoinduction. This review systematically analyzes the effects of Surface properties, in particular the Surface Structure, of CaP scaffolds on cell behavior and new bone formation. We also summarize the possible signaling pathways involved in the osteogenic differentiation of bone-related cells when cultured on Surfaces with various Structures in vitro. The significant immune response initiated by Surface Structure involved in osteogenic differentiation of cells is also discussed in this review. Taken together, the new biological principle for advanced biomaterials is not only to directly stimulate osteogenic differentiation of bone-related cells but also to modulate the immune response in vivo. Although the reaction mechanism responsible for bone formation induced by CaP Surface Structure is not clear yet, the insights on Surface Structure-mediated osteogenic differentiation and osteoimmunomodulation could aid the optimization of CaP-based biomaterials for bone regeneration. STATEMENT OF SIGNIFICANCE: CaP ceramics have similar inorganic composition with natural bone, which have been widely used for bone tissue scaffolds. CaP themselves are not osteoinductive; however, osteoinductive properties could be introduced to CaP materials by Surface engineering. This paper systematically summarizes the effects of Surface properties, especially Surface Structure, of CaP scaffolds on bone formation. Additionally, increasing evidence has proved that the bone healing process is not only affected by the osteogenic differentiation of bone-related cells, but also relevant to the the cooperation of immune system. Thus, we further review the possible signaling pathways involved in the osteogenic differentiation and immune response of cells cultured on scaffold Surface. These insights into Surface Structure-mediated osteogenic differentiation and osteoimmunomodulated-based strategy could aid the optimization of CaP-based biomaterials.

  • Cells responding to Surface Structure of calcium phosphate ceramics for bone regeneration
    Journal of Tissue Engineering and Regenerative Medicine, 2017
    Co-Authors: Jingwei Zhang, Davide Barbieri, Joost D. De Bruijn, Clemens Van Blitterswijk, Lorenzo Moroni, Huipin Yuan
    Abstract:

    Surface Structure largely affects the inductive bone-forming potential of calcium phosphate (CaP) ceramics in ectopic sites and bone regeneration in critical-sized bone defects. Surface-dependent osteogenic differentiation of bone marrow stromal cells (BMSCs) partially explained the improved bone-forming ability of submicron Surface Structured CaP ceramics. In this study, we investigated the possible influence of Surface Structure on different bone-related cells, which may potentially participate in the process of improved bone formation in CaP ceramics. Besides BMSCs, the response of human brain vascular pericytes (HBVP), C2C12 (osteogenic inducible cells), MC3T3-E1 (osteogenic precursors), SV-HFO (pre-osteoblasts), MG63 (osteoblasts) and SAOS-2 (mature osteoblasts) to the Surface Structure was evaluated in terms of cell proliferation, osteogenic differentiation and gene expression. The cells were cultured on tricalcium phosphate (TCP) ceramics with either micron-scaled Surface Structure (TCP-B) or submicron-scaled Surface Structure (TCP-S) for up to 14 days, followed by DNA, alkaline phosphatase (ALP) and quantitative polymerase chain reaction gene assays. HBVP were not sensitive to Surface Structure with respect to cell proliferation and osteogenic differentiation, but had downregulated angiogenesis-related gene expression (i.e. vascular endothelial growth factor) on TCP-S. Without additional osteogenic inducing factors, submicron-scaled Surface Structure enhanced ALP activity and osteocalcin gene expression of human (h)BMSCs and C2C12 cells, favoured the proliferation of MC3T3-E1, MG63 and SAOS-2, and increased ALP activity of MC3T3-E1 and SV-HFO. The results herein indicate that cells with osteogenic potency (either osteogenic inducible cells or osteogenic cells) could be sensitive to Surface Structure and responded to osteoinductive submicron-Structured CaP ceramics in cell proliferation, ALP production or osteogenic gene expression, which favour bone regeneration. Copyright © 2017 John Wiley & Sons, Ltd.

  • Cells responding to Surface Structure of calcium phosphate ceramics for bone regeneration
    Journal of Tissue Engineering and Regenerative Medicine, 2017
    Co-Authors: Jingwei Zhang, Davide Barbieri, Joost D. De Bruijn, Lorenzo Moroni, L.y. Sun, Xiaoman Luo, Clemens Van Blitterswijk, Huipin Yuan
    Abstract:

    Surface Structure largely affects the inductive bone-forming potential of calcium phosphate (CaP) ceramics in ectopic sites and bone regeneration in critical-sized bone defects. Surface-dependent osteogenic differentiation of bone marrow stromal cells (BMSCs) partially explained the improved bone-forming ability of submicron Surface Structured CaP ceramics. In this study, we investigated the possible influence of Surface Structure on different bone-related cells, which may potentially participate in the process of improved bone formation in CaP ceramics. Besides BMSCs, the response of human brain vascular pericytes (HBVP), C2C12 (osteogenic inducible cells), MC3T3-E1 (osteogenic precursors), SV-HFO (pre-osteoblasts), MG63 (osteoblasts) and SAOS-2 (mature osteoblasts) to the Surface Structure was evaluated in terms of cell proliferation, osteogenic differentiation and gene expression. The cells were cultured on tricalcium phosphate (TCP) ceramics with either micron-scaled Surface Structure (TCP-B) or submicron-scaled Surface Structure (TCP-S) for up to 14 days, followed by DNA, alkaline phosphatase (ALP) and quantitative polymerase chain reaction gene assays. HBVP were not sensitive to Surface Structure with respect to cell proliferation and osteogenic differentiation, but had downregulated angiogenesis-related gene expression (i.e. vascular endothelial growth factor) on TCP-S. Without additional osteogenic inducing factors, submicron-scaled Surface Structure enhanced ALP activity and osteocalcin gene expression of human (h)BMSCs and C2C12 cells, favoured the proliferation of MC3T3-E1, MG63 and SAOS-2, and increased ALP activity of MC3T3-E1 and SV-HFO. The results herein indicate that cells with osteogenic potency (either osteogenic inducible cells or osteogenic cells) could be sensitive to Surface Structure and responded to osteoinductive submicron-Structured CaP ceramics in cell proliferation, ALP production or osteogenic gene expression, which favour bone regeneration. Copyright © 2017 John Wiley & Sons, Ltd.

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