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Determination of the calcium sulfate hemihydrate content by regression analysis using the initial setting time

Li Bing

Archives of Civil Engineering

2020

Vol. 66, nr 2

421--437

In this paper, we randomly select 75 sets data of calcium sulfate hemihydrate (CSH) content and initial setting time, and the traditional test method of CSH and analyses initial setting time was used by complexometric titration. So the close relationship between them was studied in depth, which classification fitting data to be analyzed by regression analysis. The result shows that this regression analysis method can accurately determine CSH content in modified industrial by-product gypsum. The determination method has the advantages of simplification and rapid operation. As well as, the XRF quantitative analytical method was used to test the CSH content, which verified the accuracy of regression analysis method. The results also show that this method has high accuracy, and can simplify the traditional experimental process. The method developed is easier and more convenient and has broad prospects in application.

The effect of zinc oxide doping on mechanical and biological properties of 3D printed calcium sulfate based scaffolds

Aldemir Dikici B., Dikici S., Karaman O., Oflaz H.

Biocybernetics and Biomedical Engineering

2017

Vol. 37, no. 4

733--741

Fabrication of defect-matching scaffolds is the most critical step in bone tissue engineering. Three-dimensional (3D) printing is a promising technique for custom design scaffold fabrication due to the high controllability and design independency. The objective of this study is to investigate the effect of zinc oxide (ZnO) doping on mechanical and biological characteristics of 3D printed (3DP) calcium sulfate hemihydrate (CSHH) scaffolds. Crystalline phases, wettability, compressive strength and Young's modulus, human bone marrow derived mesenchymal stem cells (hMSCs) attachment, proliferation and morphology were investigated. XRD results showed that CSHH powder transformed into gypsum after the printing process due to the water content of binder. Contact angle measurements indicated that ZnO doped CSHH scaffolds have hydrophilic character, which stimulates cell attachment. The mechanical and cell culture studies demonstrated that increasing the ZnO doping concentration both mechanical strength and cell proliferation on CSHH scaffolds were enhanced.

Badania konwersji dwuwodzianu siarczanu(VI) wapnia do półwodzianu metodą ciągłą

Kic B., Grzmil B., Lubkowski K., Goc A., Żurek O.

Przemysł Chemiczny

2013

T. 92, nr 5

837-842