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Measurement modulus of elasticity related to the atomic density of planes in unit cell of crystal lattices
, Article Materials ; Volume 13, Issue 19 , 2020 , Pages 1-17 ; Palevicius, A ; Dashti, A ; Nasiri, S ; Monshi, A ; Vilkauskas, A ; Janusas, G ; Sharif University of Technology
MDPI AG
2020
Abstract
Young’s modulus (E) is one of the most important parameters in the mechanical properties of solid materials. Young’s modulus is proportional to the stress and strain values. There are several experimental and theoretical methods for gaining Young’s modulus values, such as stress–strain curves in compression and tensile tests, electromagnetic-acoustic resonance, ultrasonic pulse echo and density functional theory (DFT) in different basis sets. Apparently, preparing specimens for measuring Young’s modulus through the experimental methods is not convenient and it is time-consuming. In addition, for calculating Young’s modulus values by software, presumptions of data and structures are needed....
Improvement of performance of polyamide reverse osmosis membranes using dielectric barrier discharge plasma treatment as a novel surface modification method
, Article Polymer Engineering and Science ; Volume 59 , 2019 , Pages E468-E475 ; 00323888 (ISSN) ; Asadollahi, M ; Mousavi, S. A ; Farhadi, F ; Sharif University of Technology
John Wiley and Sons Inc
2019
Abstract
In this research, surface modification of aromatic polyamide thin film composite (TFC) reverse osmosis (RO) membranes was carried out using dielectric barrier discharge (DBD) plasma treatment to improve the performance and fouling resistance of prepared RO membranes. First, polyamide TFC RO membranes were synthesized via interfacial polymerization of m-phenylenediamine and trimesoyl chloride monomers over microporous polysulfone support membrane. Next, the DBD plasma treatment with 15 s, 30 s, 60 s, and 90 s duration was used for surface modification. The surface properties of RO membranes were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR),...
Improvement of performance of polyamide reverse osmosis membranes using dielectric barrier discharge plasma treatment as a novel surface modification method
, Article Polymer Engineering and Science ; Volume 59 , 2019 , Pages E468-E475 ; 00323888 (ISSN) ; Asadollahi, M ; Mousavi, S. A ; Farhadi, F ; Sharif University of Technology
John Wiley and Sons Inc
2019
Abstract
In this research, surface modification of aromatic polyamide thin film composite (TFC) reverse osmosis (RO) membranes was carried out using dielectric barrier discharge (DBD) plasma treatment to improve the performance and fouling resistance of prepared RO membranes. First, polyamide TFC RO membranes were synthesized via interfacial polymerization of m-phenylenediamine and trimesoyl chloride monomers over microporous polysulfone support membrane. Next, the DBD plasma treatment with 15 s, 30 s, 60 s, and 90 s duration was used for surface modification. The surface properties of RO membranes were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR),...