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نویسندگان مقالات پربازدید :
آکتا بیومتریال
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • porous and strong bioactive glass (13-93) scaffolds prepared by unidirectional freezing of camphene-based suspensions

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 704
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     scaffolds of 13-93 bioactive glass (6na2o, 12k2o, 5mgo, 20cao, 4p2o5, 53sio2; wt.%) with an oriented pore architecture were formed by unidirectional freezing of camphene-based suspensions, followed by thermal annealing of the frozen constructs to grow the camphene crystals. after sublimation of the camphene, the constructs were sintered (1 h at 700 °c) to produce a dense glass phase with oriented macropores. the objective of this work was to study how constant freezing rates (1–7 °c min−1) during the freezing step influenced the pore orientation and mechanical response of the scaffolds. when compared to scaffolds prepared by freezing the suspensions on a substrate kept at a constant temperature of 3 °c (time-dependent freezing rate), higher freezing rates resulted in better pore orientation, a more homogeneous microstructure and a marked improvement in the mechanical response of the scaffolds in compression. scaffolds fabricated using a constant freezing rate of 7 °c min−1 (porosity = 50 ± 4%; average pore diameter = 100 μm), had a compressive strength of 47 ± 5 mpa and an elastic modulus of 11 ± 3 gpa (in the orientation direction). in comparison, scaffolds prepared by freezing on the constant-temperature substrate had strength and modulus values of 35 ± 11 mpa and 8 ± 3 gpa, respectively. these oriented bioactive glass scaffolds prepared by the constant freezing rate route could potentially be used for the repair of defects in load-bearing bones, such as segmental defects in the long bones.

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