Frontiers of Materials Science 2017年第二期热点文章推荐

Frontiers of Materials Science 最新一期 发表了 华中科技大学先进生物材料与组织工程中心张胜民教授和王江林研究员作为通讯作者的一篇研究论文 “ Si-doping bone composite based on protein template-mediated assembly for enhancing bone regeneration ” 。评阅人认为， “This is a quite interesting manuscript in which authors prepared Si-HA nanocrystals/polymer nanocomposite, and systematically studied their osteogenic differentiation and in vivo bone formation. This work represents a significant advance of third-generation biomaterials.” 敬请关注。

Abstract :  Bio-inspired hybrid materials that contain organic and inorganic networks interpenetration at the molecular level have been a particular focus of interest on designing novel nanoscale composites. Here we firstly synthesized a series of hybrid bone composites, silicon-hydroxyapatites/silk fibroin/collagen, based on a specific molecular assembled strategy. Results of material characterization confirmed that silicate had been successfully doped into nano-hydroxyapatite lattice. In vitro evaluation at the cellularlevel clearly showed that these Si-doped composites were capable of promoting the adhesion and proliferation of rat mesenchymal stem cells (rMSCs), extremely enhancing osteoblastic differentiation of rMSCs compared with silicon-free composite. More interestingly, we found there was a critical point of silicon content in the composition on regulating multiple cell behaviors. In vivo animal evaluation further demonstrated that Si-doped composites enabled to significantly improve therepair of cranial bone defect. Consequently, our  work not only suggests fabricating a potential bone repair materials by integrating element-doping and molecular assembled strategy in one system, but also paves a new way for constructing multi-functional composite materials in the future.

K EYWORDS :  silicate-doped; molecular assembly; biomimetic bone; osteoblastic differentiation; bone regeneration

Citethis article:

Qin Yang, Yingying Du, Yifan Wang, Zhiying Wang, Jun Ma, Jianglin Wang, Shengmin Zhang. Si-doping bone composite based on protein template-mediated assembly for enhancing bone regeneration . Front. Mater. Sci. , 2017, 11(2): 106-119

Frontiers of Materials Science 最新一期 发表 了哈尔滨理工大学材料科学与工程学院胥焕岩教授作为第一作者和通讯作者的一篇研究论文 “ Crystal-chemistry insight into the photocatalytic activity of BiOCl _x Br _{1− x} nanoplate solid solutions ” 。评阅人认为， “The authors developed a facile method to synthesize room-temperature BiOCl _x Br _{1− x} nanoplate solid solutions with enhanced photocatalytic activity. This is an interesting work on an important topic.” 敬请关注。

ABSTRACT :  In this study, a facile alcoholysis method was developed to synthesize BiOCl _x Br _{1 − x} nanoplates at room temperature and atmospheric pressure. In this route, strong acid or alkaline environment was absolutely avoided to realize the high exposure of {001} crystal facets. The regular changes in XRD peaks and cell parameters as a function of the Br content strongly declared that the obtained BiOCl _x Br _{1 − x} products belonged to a group of solid solutions.The 2D nanosheets with in-plane wrinkles were clearly observed in TEM images. Interestingly, as the Br content increased, band gaps of BiOCl _x Br _{1 − x} solid solutions gradually decreased. The photocatalytic degradation of RhB under simulated sunlight irradiation indicated that BiOCl _0.5 Br _0.5 had the best photocatalytic activity. From the viewpoint of crystal chemistry, the photocatalytic activityof BiOCl _x Br _{1 − x} solid solutions was closely related with the exposure amount of {001} facets, interlayer spacing of (001) plane and energy-level position of valence band.

KEYWORDS :  BiOCl _x Br _{1 − x} solid solutions; {001} facets exposure; internal electric field; interlayer spacing; energy-level position

Citethis article:

Huan-Yan Xu, Xu Han, Qu Tan, Ke-Jia Wu, Shu-Yan Qi. Crystal-chemistry insight into the photocatalytic activity of BiOCl _x Br _{1 − x} nanoplate solid solutions . Front. Mater. Sci. , 2017, 11(2): 120-129