Search

Your search keyword '"Mondinos, Nicholas"' showing total 22 results
Start Over Author "Mondinos, Nicholas" Search Limiters Full Text
22 results on '"Mondinos, Nicholas"'

11. Enhancement of thermal and mechanical stabilities of silicon doped titanium nitride coating by manipulation of sputtering conditions

Author

Mohammadpour, Ehsan, Yun, Willey Hsien Liew, Mondinos, Nicholas, Altarawneh, Mohammednoor, Lee, Sunghwan, Radevski, Nik, Minakshi, Manickam, Amri, Amun, Lim, Hong Ngee, Jiang, Zhong Tao, Mohammadpour, Ehsan, Yun, Willey Hsien Liew, Mondinos, Nicholas, Altarawneh, Mohammednoor, Lee, Sunghwan, Radevski, Nik, Minakshi, Manickam, Amri, Amun, Lim, Hong Ngee, and Jiang, Zhong Tao

Abstract

This study investigates the influence of substrate (AISI M42 tool steel) bias voltage (from −30 to −80 V), on the mechanical properties of magnetron sputtered TiSiN coating derived from Ti and Si targets. Thermal stability, microstructure (crystallite size, microstrain, lattice constant), morphology and mechanical (hardness, Young's modulus, residual stresses) properties, of the deposited TiSiN coatings, were investigated with synchrotron powered X-ray diffraction (SR-XRD), X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and nanoindentation techniques. Rietveld analysis, of the in-situ SR-XRD, in the temperature range of 25–800 °C, demonstrated cubic TiN form in (Ti,Si)N solid solutions, with TiO2 and Ti2O3 identified at lower bias voltages. Density functional theory supplemented the experimental results. Increase in the bias voltage resulted in: (i) a decrease in Si content, (ii) significant smoothening of surface morphology, (iii) change in the phase composition and microstructure, (iv) improved oxidation resistance and thermal oxidation threshold, and (v) hardness and Young's modulus of the coatings increased up to 50% to 33 GPa and 450 GPa, respectively.

Published
2022

15. Experimental and predicted mechanical properties of Cr1−xAIxN thin films, at high temperatures, incorporating in situ synchrotron radiation X-ray diffraction and computational modelling

Author

Mohammadpour, Ehsan, primary, Jiang, Zhong-Tao, additional, Altarawneh, Mohmmednoor, additional, Mondinos, Nicholas, additional, Rahman, M. Mahbubur, additional, Lim, H. N., additional, Huang, N. M., additional, Xie, Zonghan, additional, Zhou, Zhi-feng, additional, and Dlugogorski, Bogdan Z., additional

Published
2017
Full Text
View/download PDF

17. Nanorose-like ZnCo2O4 coatings synthesized via sol–gel route: morphology, grain growth and DFT simulations.

Author

Awaltanova, Ella, Amri, Amun, Mondinos, Nicholas, Altarawneh, Mohammednoor, Moh, T. S. Y., Widjaja, Hantarto, Chuah, Lee Siang, Lee, Hooi Ling, Yang-Yin, Chun, Rahman, M. Mahbubur, Amri, Idral, Iwantono, Iwantono, and Jiang, Zhong-Tao

Abstract

Ternary cobalt-based metal oxide (ZnCo2O4) has been successfully coated onto aluminum substrate via sol–gel method. The coatings were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and UV–Vis–NIR spectrophotometry. Thermal degradation of the coatings was probed by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Model of crystal growth kinetics and density functional theory (DFT) calculations further probed the crystalline structure evolution. The predicted ZnCo2O4 crystalline structures were confirmed by XRD and EDX. The grain growth kinetic model for ZnCo2O4, derived from Lifshitz–Slyozov–Wagner (LSW) theory, determined that the growth of crystalline phases is unaffected by the annealing temperature; however, the crystallites' sizes decreased with the increase in precursor concentration. DFT analysis indicated that structural energy stability between the bulk state and slabs of ZnCo2O4 was at two oxygen layers (O-layers) with an optimum grain width of 17.21 Å. Interestingly, the morphology of ZnCo2O4 represented a rose-like template structure formed by inter-connecting layers of nanosheets. This unique surface morphology enhanced the optical absorptance properties up to α = 70.7%. Highlights: The kinetics, structural and absorptance properties of zinc and cobalt mixed oxides are not well understood due to lack of prior consolidated research findings. Therefore, our research focuses on the formation, grain growth kinetics, mineralogical and surface structure, as well as the absorptance properties of zinc and cobalt mixed oxides coating on aluminum substrates. This represents a novel holistic analysis within the ambit of sol-gel science. Furthermore, the novelty involves the incorporation of the experimental results complemented by grain growth kinetics modelling using LSW model and simulation of the grain size against the coating thickness of ZnCo2O4. We also developed a model at a smaller scale and utilized the density functional theory (DFT) to calculate the stability of each case in the model. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

19. Effects of annealing temperatures on the morphological, mechanical, surface chemical bonding, and solar selectivity properties of sputtered TiAlSiN thin films

Author

Rahman, M. Mahburbur, Jiang, Zhong-Tao, Zhou, Zhi-feng, Xie, Zonghan, Yin, Chun, Kabir, Humayun, Haque, Md. M, Amri, Amun, Mondinos, Nicholas, Altarawneh, Mohammednoor, Rahman, M. Mahburbur, Jiang, Zhong-Tao, Zhou, Zhi-feng, Xie, Zonghan, Yin, Chun, Kabir, Humayun, Haque, Md. M, Amri, Amun, Mondinos, Nicholas, and Altarawneh, Mohammednoor

Abstract

Rahman, M. M., Jiang, Z. T., Zhou, Z. F., Xie, Z., Yin, C. Y., Kabir, H., ... & Altarawneh, M. (2016). Effects of annealing temperatures on the morphological, mechanical, surface chemical bonding, and solar selectivity properties of sputtered TiAlSiN thin films. Journal of Alloys and Compounds, 671, 254-266. Available here

20. High temperature in-situ phase stability of sputtered TiAl x N coatings

Author

Patel, Shyam Bharatkumar, Mohammadpour, Ehsan, Mondinos, Nicholas, Zhao, Xiaoli, Veder, Jean-Pierre, Zhou, Zhi-feng, Moh, T.S.Y., Liew, Willey Yun Hsien, Lee, Sunghwan, Jiang, Zhong-Tao, Patel, Shyam Bharatkumar, Mohammadpour, Ehsan, Mondinos, Nicholas, Zhao, Xiaoli, Veder, Jean-Pierre, Zhou, Zhi-feng, Moh, T.S.Y., Liew, Willey Yun Hsien, Lee, Sunghwan, and Jiang, Zhong-Tao

Abstract

Patel, S. B., Mohammadpour, E., Mondinos, N., Zhao, X., Veder, J. -., Zhou, Z. -., . . . Jiang, Z. -. (2019). High temperature in-situ phase stability of sputtered TiAl x N coatings. Journal of Alloys and Compounds, 786, 507-514. Available here

21. Understanding local bonding structures of Ni-doped chromium nitride coatings through synchrotron radiation NEXAFS spectroscopy

Author

Rahman, Mahbubur M, Jiang, Zhong-Tao, Xie, Zonghan, Duan, Xiaofie, Zhou, Zhi-feng, Wo, Pui Ching, Yin, Chun-Yang, Mondinos, Nicholas, Gu, Qinfen, Widjaja, Hantarto, Jack, Kevin, Yago, Anya, Amri, Amun, Rahman, Mahbubur M, Jiang, Zhong-Tao, Xie, Zonghan, Duan, Xiaofie, Zhou, Zhi-feng, Wo, Pui Ching, Yin, Chun-Yang, Mondinos, Nicholas, Gu, Qinfen, Widjaja, Hantarto, Jack, Kevin, Yago, Anya, and Amri, Amun

Abstract

Rahman M.M., Jiang Z., Xie Z., Duan X., Zhou Z., Wo P.C., Yin C., Mondinos N., Gu Q., Widjaja H., Jack K., Yago A., & Amri A. (2014). Understanding local bonding structures of Ni-doped chromium nitride coatings through synchrotron radiation NEXAFS spectroscopy. Journal of Physical Chemistry C, 118(32), 18573-18579. Available here

22. A mechanical and modelling study of magnetron sputtered cerium-titanium oxide film coatings on Si (100)

Author

Patel, Shyam Bharatkumar, Radevski, Nik, Mondinos, Nicholas, Zhao, Xiaoli, Jack, Kevin, Veder, Jean-Pierre, Zhou, Zhi-feng, Jiang, Zhong-Tao, Patel, Shyam Bharatkumar, Radevski, Nik, Mondinos, Nicholas, Zhao, Xiaoli, Jack, Kevin, Veder, Jean-Pierre, Zhou, Zhi-feng, and Jiang, Zhong-Tao

Abstract

Patel, S. B., Radevski, N., Mondinos, N., Zhao, X., Jack, K., Veder, J. P., ... & Jiang, Z. T. (2018). A mechanical and modelling study of magnetron sputtered cerium-titanium oxide film coatings on Si (100). Ceramics International, 45(6), 6875-6884. Available here

Catalog

Books, media, physical & digital resources
See catalog results