Chunmei Wang

Bio: Chunmei Wang is an academic researcher from Liaocheng University. The author has contributed to research in topics: Dielectric & Energy-dispersive X-ray spectroscopy. The author has an hindex of 4, co-authored 4 publications receiving 72 citations.

High strain in (Bi1/2Na1/2)0.935Ba0.065TiO3–Sr3FeNb2O9 lead-free ceramics with giant piezoresponse

Abstract: The structure, electric field-induced strain (EFIS), polarization and piezoelectric response of lead-free Sr3FeNb2O9-modified (Bi1/2Na1/2)0.935Ba0.065TiO3 (BNBT–xSFN, with x = 0–0.012) ceramics were investigated. XRD patterns show that all compositions have a pure perovskite structure and SFN effectively diffused into the BNBT lattice during sintering to form a solid solution. A large EFIS of 0.35% was obtained at the critical composition of x = 0.009 which corresponds to a normalized strain (Smax/Emax) of 583 pm V−1. A maximum value of piezoelectric constant (254 pC N−1) was obtained for x = 0.006. These results show our research can benefit the developments of Bi1/2Na1/2TiO3 ceramics and widen their range of applications.

Preparation and apatite formation on CaO–MgO–P2O5–SiO2 glass film grown by pulsed laser deposition

Abstract: Magnesium-containing bioactive glass thin film was successfully grown on Ti6Al4V substrate by pulsed laser deposition (PLD). The obtained film was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). It is observed that the as-deposited film was dense and constituted with a large number of micron-sized and submicron-sized droplets. In vitro assays confirmed the apatite formation, and with increased immersion time, the Ca/P ratios of film surface gradually decreased to a stable value close to that of the stoichiometric value of hydroxyapatite (HA).

Magnesium-containing bioactive polycrystalline silicate-based ceramics and glass-ceramics for biomedical applications

Abstract: With improvement of orthopaedic technologies for bone replacement and regeneration, there is an increasing need for materials with superior properties. Mg-containing silicate ceramics and glass-ceramics have been shown to be bioactive and exhibit various advantages for biomedical applications. This review paper is intended to summarize and discuss the most relevant studies carried out in the field of Mg-containing bioactive silicate ceramics and glass-ceramics.

Bivalent cationic ions doped bioactive glasses: the influence of magnesium, zinc, strontium and copper on the physical and biological properties

Abstract: Bioactive glass and glass ceramic materials are widely used as substitutes for bone augmentation and restoration, in orthopaedic, dental and maxillofacial surgery and in the tissue engineering field. Indeed, these materials are bioactive, biocompatible, mechanically stable, biodegradable and favour osteointegration, being able to promote bone tissue formation at their surface and to bond to surrounding living tissues when implanted in the human body. It has been demonstrated that bioglass (BG) ionic dissolution products (e.g. Si, Ca, P and Na) are able to induce and stimulate the expressions of genes related to the osteoblastic differentiation and bone formation, to stimulate angiogenesis in vitro and in vivo, as well as to play possible antibacterial and anti-inflammatory actions. Thus, it is possible to tailor BGs properties properly formulating their chemical composition and adding selected ions with specific functional and biological role. In this perspective, Hench proposed a new generation of genetically designed glasses, on the basis of their ability to activate specific genes involved in in situ tissue regeneration, by doping silicate and phosphate glasses with several active ions, particularly metallic ions with therapeutic effects. In this framework, the present review is aimed to provide an overview about the effect of selected cationic substitutions (i.e. magnesium, zinc, strontium and copper), incorporated within the bioglasses structure, on the physical and biological properties of these materials, since the comprehension of the influence of the most employed metallic ions has to be considered pivotal to address the formulation of more promising and performing glasses.