Here we report a successful preparation of nanostructured calcium silicate by wet chemical approach. The synthesized sample was characterized by various physico-chemical methods. Thermal stability was investigated using thermo-gravimetric and differential thermal analysis (TG-DTA). Structural characterization of the sample was carried out by the X-ray diffraction technique (XRD) which confirmed its single phase hexagonal structure. Transmission electron microscopy (TEM) was used to study the nanostructure of the ceramics while homogeneous grain distribution was revealed by scanning electron microscopy studies (SEM). The elemental analysis data obtained from energy dispersive X-ray spectroscopy (EDAX) were in close agreement with the starting composition used for the synthesis. Superhydrophilic nature of CaSiO3 was investigated at room temperature by sessile drop technique. Effect of porous nanosized CaSiO3 on early adhesion and proliferation of human bone marrow mesenchymal stem cells (BMMSCs) and cord blood mesenchymal stem (CBMSCs) cells was measured in vitro. MTT cytotoxicity test and cell adhesion test showed that the material had good biocompatibility and promoted cell viability and cell proliferation. It has been stated that the cell viability and proliferation are significantly affected by time and concentration of CaSiO3. These findings indicate that the CaSiO3 ceramics has good biocompatibility and that it is promising as a biomaterial.
S. Kochowski, Ł. Drewniak, K. Nitsch, R. Paszkiewicz and B. Paszkiewicz
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K. Grodecki, E. Dumiszewska, M. Romaniec and W. Strupinski
direction and the differences in length are the biggest.
In Fig. 3 typical Raman spectra of InP nanowires doped with silicon (red), tellurium (black) and undoped (blue) are presented.
SEM in-lens images of InP nanowires: (a) A - undoped, (b) B - doped with Si, (c), (d) C - doped with Te.
The Raman spectra of undoped nanowires and nanowires doped with Te have a broader TO band than in the case of nanowires doped with Si. Broadening of the TO band may stem from two different effects. In the first one [ 17 ], the effect comes from bending nanowires
surprisingly, B 0 estimated from the B-M fit at T = 700 K is enormous, comparable with the bulk modulus of diamond B 0 (diamond) = 442 GPa [ 49 ]. One can suspect that this overestimation stems mainly from the limitation of the B-M fit to the LSDA+DMFT results obtained at T = 700 K. It is important to notice at this place that the experimental value B 0 (Pr123) = 49.9 GPa was reported from ultrasonic velocity measurements of polycrystalline Pr123 [ 50 ] and the significant discrepancy between the theory and the experiment is noticeable. It was argued [ 51 ] that the results