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Träfflista för sökning "WFRF:(Bielecki Johan 1982) srt2:(2010-2014)"

Sökning: WFRF:(Bielecki Johan 1982) > (2010-2014)

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11.
  • He, Wenxiao, 1985, et al. (författare)
  • Biomimetic nanocrystalline apatite resembling bone
  • 2010
  • Ingår i: European Cells and Materials: 3rd International NanoBio Conference 2010, ETH Zurich, Switzerland August 24-27 2010. - 1473-2262. ; 20:suppl. 3, s. 106-
  • Konferensbidrag (refereegranskat)
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12.
  • He, Wenxiao, 1985, et al. (författare)
  • Formation of Bone-like Nanocrystalline Apatite Using Self-Assembled Liquid Crystals
  • 2012
  • Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 24:5, s. 892-902
  • Tidskriftsartikel (refereegranskat)abstract
    • A two-step process using liquid crystalline phases combined with controlled postcrystallization for the preparation of bone-like apatite has been developed. First, amorphous calcium phosphate (ACP) spherules with a diameter of 10.8 +/- 1.4 nm and specific surface area (SSA) in the range of 150-170 m(2)/g were synthesized within a reverse hexagonal liquid crystalline (LC) phase. Second, the ACP spherules were dispersed and aged in Milli-Qwater, where they crystallized into poorly crystalline apatite (PCA). The addition of heparin during aging was explored, which was shown to retard the ACP - PCA conversion. The particle formation within the LC phase was monitored using synchrotron small-angle X-ray scattering, and the formed materials were characterized by X-ray diffraction, conventional and high-resolution transmission electron microscopy, nitrogen adsorption, thermogravimetry with infrared-coupled analysis, and Raman spectroscopy. The PCA formed using the LC aging route presented bone-resembling features, such as,Ca2+ and OH- deficiency, CO32- substitution, poor crystallinity; and ultrahigh SSA of 356 m(2)/g. The resulting particles were compared to hydroxyapatite synthesized via a conventional water-based precipitation method. The LC-aging route exhibited excellent controllability over the CaP crystallization, which enabled facile tailoring of the resulting material properties for different types of application.
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13.
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14.
  • Knee, Christopher, 1973, et al. (författare)
  • High Pressure Crystal and Magnetic Phase Transitions in Multiferroic Bi0.9La0.1FeO3
  • 2014
  • Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 1520-5002 .- 0897-4756. ; 26:2, s. 1180-1186
  • Tidskriftsartikel (refereegranskat)abstract
    • The crystal and magnetic structures of multiferroic Bi0.9La0.1FeO3 have been studied using high resolution neutron powder diffraction in the pressure range 0-8 GPa. Two structural phase transitions are observed. The first, at similar to 1 GPa, transforms the polar R3c structure to an antipolar PbZrO3-like root 2a(p) x 2 root 2a(p) x 2a(p) perovskite superstructure; the second, at similar to 5 GPa, results in a smaller, root 2a(p) x root 2a(p) x 2a(p) unit cell and a structure described with Ibmm (nonstandard setting of Imma) symmetry, in which the a(-)a(-)b(0) octahedral tilt system is retained and the antipolar cation displacements lost. Accompanying the changes in the nuclear structure, the antiferromagnetic spin structure evolves from a cycloid, with a modulation length, lambda approximate to 770 angstrom, to collinear arrangements with the moments aligned along the b-axis (Pbam) and the a-axis (Ibmm) of the orthorhombic unit cells. In comparison with BiFeO3 the transition from a rhombohedral to an orthorhombic structure is suppressed by similar to 3 GPa, reflecting the dilution of the stereochemically active bismuth lone pair by lanthanum. A correlation between the cell contraction of Bi1-xLaxFeO3 (0.0
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  • Resultat 11-14 av 14
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refereegranskat (11)
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Bielecki, Johan, 198 ... (14)
Börjesson, Lars, 195 ... (6)
Knee, Christopher, 1 ... (4)
Liu, Johan, 1960 (3)
Matic, Aleksandar, 1 ... (3)
Andersson, Martin, 1 ... (3)
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He, Wenxiao, 1985 (3)
Eriksson, Sten, 1958 (2)
Fu, Yifeng, 1984 (2)
Cai, Shengzhen (2)
Zhang, Y. (1)
Sun, Jie, 1977 (1)
Zhang, Y. H. (1)
Wallenberg, Reine (1)
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