title: Controlled synthesis of monodisperse α-calcium sulfate hemihydrate nanoellipsoids with a porous structure.
abstract: We report a facile and green chemical solution approach to synthesize monodisperse α-calcium sulfate hemihydrate (α-HH) nanoellipsoids with a length of 600 nm and a width of 300 nm by simply mixing Ca(2+) and SO4(2-) glycerol-water precursor solutions in the presence of Na2EDTA. The α-HH nanoellipsoid is formed through a Na2EDTA-mediated self-assembly of small primary building blocks (α-HH domains: ∼14 nm). The study on the morphological evolution of α-HH reveals that the controlled synergy of supersaturation (precursor concentration) and Na2EDTA is crucial for the development of α-HH into nanoellipsoids. Further thermal annealing of the nanoellipsoid could make the α-HH domains transit into calcium sulfate anhydrites and grow up, generating the gaps between them and resulting in a porous structure. This work paves a new way for preparing high-quality α-HH nanoellipsoids with a monodisperse nanosize and a porous structure, promising their future application in many fields such as biomedicine.
authors: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. guanbaohong@zju.edu.cn.
authors: Guangming
authors: G
authors: Jiang
authors: Qiaoshan
authors: Q
authors: Chen
authors: Caiyun
authors: C
authors: Jia
authors: Sen
authors: S
authors: Zhang
authors: Zhongbiao
authors: Z
authors: Wu
authors: Baohong
authors: B
authors: Guan
mesh_terms: D002133:Calcium Sulfate / Q000138:chemical synthesis* / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
chemical_list: D002133:Calcium Sulfate