Facile fabrication of hydrophobic surfaces on mechanically alloyed-Mg/HA/TiO2/MgO bionanocomposites

Khalajabadi, Shahrouz Zamani; Kadir, Mohammed Rafiq Abdul; Izman, S.; Yusop, Mohd Zamri Mohd

doi:10.1016/j.apsusc.2014.10.158

Cited by 14 publications

(8 citation statements)

References 44 publications

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“…Od svih zemnoalkalnih metala, magnezijum oksid ima najmanji potencijal za reakciju u čvrstoj fazi. Mehaničko aktiviranje polaznih komponenti u cilju dobijanja magnezijum titanata ispitivali su mnogi autori [35][36][37][38][39][40][41].…”

Section: Uvodunclassified

Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system

Đorđević

Vlahović

Martinović

et al. 2021

Hem Ind

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In this study, a mixture of magnesium oxide and titanium dioxide was mechanically activated in order to investigate the possibility of mechanochemical synthesis of magnesium titanate. Mechanical activation was performed for 1000 min in a high-energy vibro mill (type MH954/3, KHD Humboldt Wedag AG, Germany). The mill is equipped with housing having a horizontally placed shutter. The cylindrical stainless steel working vessel, with inner dimensions of 40 mm in height and 170 mm in diameter, has working elements consisting of two free concentric stainless steel rings with a total weight of 3 kg. The engine power is 0.8 kW. Respecting the optimal amount of powder to be activated of 50-150 g and the stoichiometric ratio of the reactants in the equation presenting the chemical reaction of magnesium titanate synthesis, the starting amounts were 20.2 g (0.5 mol) of MgO and 39.9 g (0.5 mol) TiO2. During the experiments, X-ray diffraction analysis of the samples taken from the reaction system after 60, 180, 330, and 1000 min of mechanical activation was performed. Atomic absorption spectrophotometry was used for chemical composition analysis of samples taken at different activation times. Based on the X-ray diffraction analysis results, it can be concluded that the greatest changes in the system took place at the very beginning of the mechanical activation due to the disturbance of the crystal structure of the initial components. X-ray diffraction analysis of the sample after 1000 min of activation showed complete amorphization of the mixture, but diffraction maxima characteristic for magnesium titanate were not identified. Therefore, the mechanical activation experiments were stopped. Evidently, the energy input was not sufficient to overcome the energy barrier to form a new chemical compound - magnesium titanate. The failure to synthesize magnesium titanate is explained by the low negative Gibbs energy value of -25.8 kJ/mol (despite the theoretical possibility that the reaction will happen), as well as by the amount of mechanical energy entered into the system during activation which was insufficient to obtain the reaction product. Although the synthesis of MgTiO3 was not achieved, significant results were obtained which identify models for further investigations of the possibility of mechanochemical reactions of alkaline earth metals and titanium dioxide.

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Section: Uvodunclassified

Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system

Đorđević

Vlahović

Martinović

et al. 2021

Hem Ind

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“…and 630°C have been investigated [14,15]. In addition, the surface characteristics, in vitro biocorrosion behavior and mechanical properties of the single-layer ZnO coating compared with the double-layer Si/ZnO coating on the Mg/HA/TiO 2 /MgO nanocomposite were investigated in this study.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, improvement in the corrosion resistance of Mg alloys is essential while the mechanical properties are not compromised or even enhanced for increasing their potential applications. Alloying with non-toxic elements, such as Ca [10], Zn [11], and Si [12], to form magnesium-matrix composites (MMCs) with bioceramics of natural human bone compositions, such as hydroxylapatite (HA) [13][14][15] and β-tricalcium phosphate (β-TCP) [16], as well as surface treatment have been widely employed to decrease the corrosion rate of Mg-based materials [17][18][19][20][21][22]. Surface modification techniques, such as physical vapor deposition (PVD) [23], alkaline heat treatment [19], micro-arc oxidation [24], electrodeposition [22,23], the sol-gel method [17,18], and magnetron sputtering [25], are effective for solving these problems.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization, biocorrosion evaluation and mechanical properties of nanostructured ZnO and Si/ZnO coated Mg/HA/TiO2/MgO nanocomposites

Khalajabadi

Kadir

Izman

et al. 2015

Surface and Coatings Technology

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“…However, clinical applications of Mg are limited because of its relatively poor corrosion resistance, rapid degradation rate and hydrogen gas evolution in the human body fluid [7][8][9]. The fabrication of Mg-based composites that are reinforced by bioceramics such as hydroxyapatite (HA), TiO 2 and MgO is a promising approach to improve the corrosion behavior of Mg alloys in order to satisfy the clinical requirements [10][11][12][13]. The coatings of these alloys are also effective to overcome these drawbacks and enhance the corrosion resistance of Mg alloys [14,15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, microstructure and biodegradation behavior of nano-Si and nano-ZnO/Si coatings on a Mg/HA/TiO2/MgO nanocomposite

Khalajabadi

Kadir

Izman

et al. 2015

Ceramics International

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Facile fabrication of hydrophobic surfaces on mechanically alloyed-Mg/HA/TiO2/MgO bionanocomposites

Cited by 14 publications

References 44 publications

Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system

Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system

Microstructural characterization, biocorrosion evaluation and mechanical properties of nanostructured ZnO and Si/ZnO coated Mg/HA/TiO2/MgO nanocomposites

Synthesis, microstructure and biodegradation behavior of nano-Si and nano-ZnO/Si coatings on a Mg/HA/TiO2/MgO nanocomposite

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