Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province

Haikou, China

Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province

Haikou, China
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Yan H.,Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province | Yan H.,Hainan Normal University | Huang D.,Central South University | Chen X.,Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province | And 8 more authors.
Polymer Bulletin | Year: 2017

Alginate is a well-known biomaterial which has been widely used in tissue engineering due to its excellent property. However, there are still several drawbacks, such as weak mechanical strength, the lack of cell recognition sites for cell adhesion, extensive swelling and uncontrolled degradation that limit its practical application. Therefore, the internal gelation using CaCO3–GDL complex and the incorporation of bacterial cellulose nanocrystals (BCNs) and type I collagen (COL) as the reinforcing component into alginate matrix were proposed to prepare the novel and homogeneous alginate/bacterial cellulose nanocrystals/collagen composite scaffold (ALG/BCNs/COL). The morphology, porosity, mechanical property, swelling and degradation behavior, and cytotoxicity of the resultant scaffold were investigated. The experimental results showed that ALG/BCNs/COL revealed good three-dimensional (3D) architecture as well as lamellar and porous morphologies. The incorporation of BCNs into alginate matrix obviously decreased the pore size and maintained the porosity of ALG/BCNs/COL, which was in favour of mechanical integrity. FT-IR spectra and XRD analysis revealed that the components of ALG/BCNs/COL, such as SA, BCNs and COL were combined together by intermolecular hydrogen bonds, which could effectively inhibit large swelling and retard the biodegradation of the composite scaffold. Finally, cell studies results indicated that both MC3T3-E1 and h-AMS cells were viable and proliferate well on the composite scaffold. © 2017 Springer-Verlag Berlin Heidelberg


Zhang X.,Hainan Normal University | Zhang X.,Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province | Zhang X.,Nanjing University | Zhu L.,Hainan Normal University | And 7 more authors.
Inorganica Chimica Acta | Year: 2016

A couple of enantiomeric chiral cyclometalated platinum(II) complexes [Pt(-)-L1]Cl ((-)-1) and [Pt(+)-L1]Cl ((+)-1) [(-)-L1 = (-)-4,5-pinene-6′-phenyl-2,2′-bipyridine, (+)-L1 = (+)-4,5-pinene-6′-phenyl-2,2′-bipyridine] were obtained, studying their mechanochromic behaviors, and corresponding luminescent, chiroptical and nonlinear optical properties. Upon mechanical grinding, the crystallites of (-)-1 and (+)-1 undergo a crystal-to-amorphous and ordered-to-disorder transformation. For these grinding-induced amorphous and poorly organized aggregates, the luminescence was distinctly red-shifted (Δλem = 160 nm) compared to that of crystallites. Moreover, electronic circular dichroism signals and nonlinear optical responses became almost silent. Remarkably, the poorly organized amorphous phase can be easily restored to original crystalline state upon treatment with a few drops of dichloromethane, suggesting an excellent reversible switch. © 2015 Elsevier B.V. All rights reserved.

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