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    Wyświetlanie 1-2 z 2
    Tytuł:
    Bioszkła i organiczno-nieorganiczne kompozyty dla inżynierii tkankowej kości
    Bioglasses and organic-inorganic composites for bone tissue engineering
    Autorzy:
    John, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/172492.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    biomateriały
    bioszkło
    organiczno-nieorganiczne hybrydy
    hydroksyapatyt
    implanty kości
    in vitro
    biomaterials
    bioglasses
    organic-inorganic hybrid
    hydroxyapatite
    bone implants
    Opis:
    The most demanded biomaterials for bone tissue engineering could be classified in two main sol-gel derived groups: bioglasses and organic-inorganic composites. The first of these include bioactive ceramics such as calcium phosphates (Tab. 2) [1], glasses and glass ceramics [2], and so-called inert ceramics (Tab. 1) such as Al2O3, zirconium and titanium dioxide, and carbon-based materials [3, 4]. Second-group of compounds constitute bioactive organic-inorganic hybrids, generally based on organic matrix and various inorganic dopants. Biomaterials in contact with human plasma and bone stem cells form, on their surface, hydroxyapatite Ca10(PO4)6(OH)2 (HAp) and its derivatives (Tab. 2). HAp-layer initiates bone growth and reconstruction of treated fragment (Fig. 2). These materials, due to the high degree of biocompability are considered as the most valuable compounds for bone surgery [5]. Extremely rapid development of biomaterials used in medicine caused the production of implants with different properties (Scheme 1). The real revolution and technological progress have brought biomimetic composites that mimic naturally occurring solutions in living organisms. The role of such implants is not only replacing the damaged parts of body, but – due to the appropriate morphology and composition – stimulating the growth of living cells (Fig. 3) and final bone regeneration. This article is devoted to this type of biomaterials proposed for bone tissue engineering.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 1-2; 21-39
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związki alkoholanowe w syntezie nanomateriałów
    The alkoxide compounds in the synthesis of nanomaterials
    Autorzy:
    John, Ł.
    Sobota, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/171978.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    alkoholany metali
    związki molekularne
    tlenkowe materiały ceramiczne
    metal alkoxides
    molecular compounds
    oxide ceramic materials
    Opis:
    Polynuclear metal alkoxides are nearly as common in today’s chemistry as any other simple inorganic complexes and constitute an interesting family of species with a very broad structural diversity (Fig. 3 and Tab. 1) [14]. These compounds form structural motifs which range from simple bimetallic complexes to very specific aggregates that result from the versatile coordinating abilities of an alkoxo and aryloxo ligands (Fig. 1). For the last few decades, there has been a growing interest in the development of the chemistry of metal alkoxides. Such interest derives from their fascinating structural chemistry, interesting catalytic properties, and a high potential for industrial utilization. The fact that most of them can generate highly pure and well-defined metal oxides (Table 4) has resulted in high research activity in chemistry of materials. Alkoxides and their derivatives, e.g. organometallics, are easily accessible and consist inexpensive compounds. Moreover, alkoxide ligands are easily removable during thermal treatment in a relatively low temperatures compare to conventional methods involving inorganic salts. Such compounds already have metal-oxygen bonds established on molecular structure. Due to these, alkoxides can generate oxide ceramics in a single step – so-called single-source precursors (SSPs) [11]. SSPs deliver appropriate metal elements of a final oxide product(s) eliminating the need to match the reaction rates required from a multicomponent mixture. All of these features made the metal oxides derived from metal alkoxides highly pure products possessing specific properties, chemical and mechanical resistance, excellent functions and shapes. The aim of this article is to serve as a guide in understanding the principles in a one step strategy for oxide ceramics using metal alkoxide compounds. It includes synthesis of alkoxides and their derivatives, the concept of SSPs strategy and design of molecular precursors for oxide ceramic materials.
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 9-10; 839-868
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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