Tracking Drug Loading Capacities of Calcium Silicate Hydrate Carrier: A Comparative X-ray Absorption Near Edge Structures Study

2015 ◽  
Vol 119 (31) ◽  
pp. 10052-10059 ◽  
Author(s):  
Xiaoxuan Guo ◽  
Zhiqiang Wang ◽  
Jin Wu ◽  
Yun-Mui Yiu ◽  
Yongfeng Hu ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Drug Loading ◽  
X Ray ◽  
X Ray Absorption

Sorption Mechanisms of Zinc to Calcium Silicate Hydrate:  X-ray Absorption Fine Structure (XAFS) Investigation

2001 ◽  
Vol 35 (7) ◽  
pp. 1550-1555 ◽  
Author(s):  
Felix Ziegler ◽  
André M. Scheidegger ◽  
C. Annette Johnson ◽  
Rainer Dähn ◽  
Erich Wieland
Keyword(s):  
Fine Structure ◽  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
X Ray ◽  
Absorption Fine ◽  
Sorption Mechanisms ◽  
X Ray Absorption

Imaging of drug loading distributions in individual microspheres of calcium silicate hydrate – an X-ray spectromicroscopy study

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6767-6773 ◽  
Author(s):  
Xiaoxuan Guo ◽  
Zhiqiang Wang ◽  
Jin Wu ◽  
Jian Wang ◽  
Ying-Jie Zhu ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Drug Loading ◽  
X Ray ◽  
Scanning Transmission

Ibuprofen distributions in individual CSH microspheres are being mapped in thickness via scanning transmission X-ray microscopy.

scholarly journals Effects of polymer intercalation in calcium silicate hydrates on drug loading capacities and drug release kinetics: an X-ray absorption near edge structure study

2017 ◽  
Vol 95 (11) ◽  
pp. 1122-1129 ◽  
Author(s):  
Xiaoxuan Guo ◽  
Jin Wu ◽  
Yun-Mui Yiu ◽  
Yongfeng Hu ◽  
Ying-Jie Zhu ◽  
...  
Keyword(s):  
Drug Release ◽  
Calcium Silicate ◽  
Release Kinetics ◽  
Drug Carrier ◽  
Drug Loading ◽  
Precipitation Reaction ◽  
Edge Structure ◽  
X Ray ◽  
Drug Release Kinetics ◽  
X Ray Absorption

Different calcium silicate hydrate (CSH)/polymer composites are synthesized by using a controlled precipitation reaction between calcium salt and silicate salt, followed by the addition of various polymer solutions at room temperature. X-ray absorption near edge structure (XANES) spectroscopy has been used to extensively investigate the structural changes after hybrid biomaterials formation and the drug–carrier interactions on the molecular level. We find that the polymers alter the structure of CSH to various degrees and that this behaviour further influences the drug loading capacities and drug release kinetics.

X-ray Absorption Spectroscopy Study of Immobilization Processes for Heavy Metals in Calcium Silicate Hydrates: 1. Case of Lead

Langmuir ◽  
2000 ◽  
Vol 16 (25) ◽  
pp. 9900-9906 ◽  
Author(s):  
Jérôme Rose ◽  
Isabelle Moulin ◽  
Jean-Louis Hazemann ◽  
Armand Masion ◽  
Paul M. Bertsch ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Absorption Spectroscopy ◽  
Calcium Silicate ◽  
Spectroscopy Study ◽  
X Ray ◽  
Calcium Silicate Hydrates ◽  
X Ray Absorption

scholarly journals Performance and adsorption mechanism of a magnetic calcium silicate hydrate composite for phosphate removal and recovery

2018 ◽  
Vol 2017 (2) ◽  
pp. 578-591 ◽  
Author(s):  
Lihong Peng ◽  
Hongliang Dai ◽  
Yifeng Wu ◽  
Zheqin Dai ◽  
Xiang Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetic Separation ◽  
Adsorption Kinetics ◽  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Phosphate Removal ◽  
Separation Technique ◽  
Phosphate Adsorption ◽  
X Ray ◽  
Removal And Recovery

Abstract A novel magnetic calcium silicate hydrate composite (Fe3O4@CSH) was proposed for phosphorus (P) removal and recovery from a synthetic phosphate solution, facilitated by a magnetic separation technique. The Fe3O4@CSH material was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), zeta-potential and magnetic curves. The chemical composition and structure of Fe3O4@CSH and the successful surface loading of hydroxyl functional groups were confirmed. Phosphate adsorption kinetics, isotherm, and thermodynamic experiments showed that adsorption reaches equilibrium at 24 h, with a maximum adsorption capacity of 55.84 mg P/g under optimized experimental conditions. Adsorption kinetics fitted well to the pseudo second-order model, and equilibrium data fit the Freundlich isotherm model. Thermodynamic analysis provided a positive value for ΔH° (129.84 KJ/mol) and confirmed that phosphate adsorption on these materials is endothermic. The P-laden Fe3O4@CSH materials could be rapidly separated from aqueous solution by a magnetic separation technique within 1 min. A removal rate of more than 60% was still obtained after eight adsorption/desorption cycles, demonstrating the excellent reusability of the particles. The results demonstrated that the Fe3O4@CSH materials had high P-adsorption efficiency and were reusable.

scholarly journals Effects of Ca/Si Ratio, Aluminum and Magnesium on the Carbonation Behavior of Calcium Silicate Hydrate

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1268 ◽  
Author(s):  
Jing Li ◽  
Qijun Yu ◽  
Haoliang Huang ◽  
Suhong Yin
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Bond Strength ◽  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
Magnesium Uptake ◽  
Carbonation Resistance ◽  
The Mean

The effects of Ca/Si ratio, aluminum and magnesium on the carbonation behavior of calcium silicate hydrate (C-S-H) were investigated by using X-ray powder diffraction (XRD), nuclear magnetic resonance (NMR) and thermogravimetric analyzer (TGA). The results showed that the Ca/Si ratio, Al/Si ratio and Mg/Si ratio had a significant influence on the structure, carbonation products and carbonation resistance of C-(M)-(A)-S-H. The mean chain length of silicate chains in C-S-H increased as the Ca/Si ratio decreased. Aluminum uptake in C-S-H increased the content of bridging silicate tetrahedron (Q2). A cross-linked structure (Q3) appeared when magnesium uptake in C-S-H. The carbonation product of C-S-H was vaterite if the Ca/Si ratio was lower than 0.87. The carbonation products of C-S-H were vaterite and calcite if the Ca/Si ratio was higher than 1.02. C-M-S-H had more polymerized units, stronger bond strength and better carbonation resistance than C-S-H.

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