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Mohammed Ali Assiri
Department of Chemistry, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia

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Journal article
Published: 03 June 2021 in Coatings
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(1 − x)(Na0.5Bi0.5)TiO3–xBi(Mg2/3Nb1/3)O3 ceramics with x = 0.00 mol.% (0BMN), 0.01 mol.% (1BMN), 0.03 mol.% (3BMN), and 0.05 mol.% (5BMN) were synthesized using a solid-state processing technique. The thermogravimetric analysis (TGA) of uncalcined samples up to 730 °C showed that the maximum weight loss was observed for 3BMN, whereas the minimum weight loss was attributed to the 0BMN sample. After that, calcination was performed at 800 °C for 4 h. The XRD of calcined samples showed the successful formation of the perovskite phase with no impurity phases. 1BMN and 3BMN samples showed some of the lattice strain; however, a morphotropic phase boundary (MPB) existed around x = 0.03 between the rhombohedral and tetragonal structure. The TGA of the green pellets showed weight loss up to the sintering temperature (1100 °C) and during the 3 h holding period. 5BMN showed the maximum weight loss up to sintering temperature, as well as during the holding period, whereas 0BMN displayed the minimum weight loss up to sintering temperature, as well as some weight gain during the holding period. The relative permittivity (εr) was maximum at low frequencies, but the addition of BMN improved the εr. The frequency dependence of dielectric loss (tanδ) showed that the maximum loss was observed for 3BMN at lower frequencies, and 5BMN showed the maximum loss at higher frequency among all samples.

ACS Style

Syed Afzal; Fayaz Hussain; Sajid Siyal; Muhammad Javed; Muhammad Saleem; Muhammad Imran; Mohammed Assiri; Aboud Bahajjaj; Ayman Ghfar; Murefah Al-Anazy; Mohamed Ouladsmane; Saad Al-Tamrah; Shafaqat Ali. Weight Loss during Calcination and Sintering Process of Na0.5Bi0.5TiO3–Bi1/2(Mg2/3Nb1/3)O3 Composite Lead-Free Piezoelectric Ceramics. Coatings 2021, 11, 676 .

AMA Style

Syed Afzal, Fayaz Hussain, Sajid Siyal, Muhammad Javed, Muhammad Saleem, Muhammad Imran, Mohammed Assiri, Aboud Bahajjaj, Ayman Ghfar, Murefah Al-Anazy, Mohamed Ouladsmane, Saad Al-Tamrah, Shafaqat Ali. Weight Loss during Calcination and Sintering Process of Na0.5Bi0.5TiO3–Bi1/2(Mg2/3Nb1/3)O3 Composite Lead-Free Piezoelectric Ceramics. Coatings. 2021; 11 (6):676.

Chicago/Turabian Style

Syed Afzal; Fayaz Hussain; Sajid Siyal; Muhammad Javed; Muhammad Saleem; Muhammad Imran; Mohammed Assiri; Aboud Bahajjaj; Ayman Ghfar; Murefah Al-Anazy; Mohamed Ouladsmane; Saad Al-Tamrah; Shafaqat Ali. 2021. "Weight Loss during Calcination and Sintering Process of Na0.5Bi0.5TiO3–Bi1/2(Mg2/3Nb1/3)O3 Composite Lead-Free Piezoelectric Ceramics." Coatings 11, no. 6: 676.

Journal article
Published: 07 May 2021 in Molecules
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Organic materials development, especially in terms of nonlinear optical (NLO) performance, has become progressively more significant owing to their rising and promising applications in potential photonic devices. Organic moieties such as carbazole and quinoline play a vital role in charge transfer applications in optoelectronics. This study reports and characterizes the donor–acceptor–donor–π–acceptor (D–A–D–π–A) configured novel designed compounds, namely, Q3D1–Q3D3, Q4D1–Q1D2, and Q5D1. We further analyze the structure–property relationship between the quinoline–carbazole compounds for which density functional theory (DFT) and time-dependent DFT (TDDFT) calculations were performed at the B3LYP/6-311G(d,p) level to obtain the optimized geometries, natural bonding orbital (NBO), NLO analysis, electronic properties, and absorption spectra of all mentioned compounds. The computed values of λmax, 364, 360, and 361 nm for Q3, Q4, and Q5 show good agreement of their experimental values: 349, 347, and 323 nm, respectively. The designed compounds (Q3D1–Q5D1) exhibited a smaller energy gap with a maximum redshift than the reference molecules (Q3–Q5), which govern their promising NLO behavior. The NBO evaluation revealed that the extended hyperconjugation stabilizes these systems and caused a promising NLO response. The dipole polarizabilities and hyperpolarizability (β) values of Q3D1–Q3D3, Q4D1-Q1D2, and Q5D1 exceed those of the reference Q3, Q4, and Q5 molecules. These data suggest that the NLO active compounds, Q3D1–Q3D3, Q4D1–Q1D2, and Q5D1, may find their place in future hi-tech optical devices.

ACS Style

Bakhat Ali; Muhammad Khalid; Sumreen Asim; Muhammad Usman Khan; Zahid Iqbal; Ajaz Hussain; Riaz Hussain; Sarfraz Ahmed; Akbar Ali; Amjad Hussain; Muhammad Imran; Mohammed Assiri; Muhammad Fayyaz Ur Rehman; Chenxi Wang; Changrui Lu. Key Electronic, Linear and Nonlinear Optical Properties of Designed Disubstituted Quinoline with Carbazole Compounds. Molecules 2021, 26, 2760 .

AMA Style

Bakhat Ali, Muhammad Khalid, Sumreen Asim, Muhammad Usman Khan, Zahid Iqbal, Ajaz Hussain, Riaz Hussain, Sarfraz Ahmed, Akbar Ali, Amjad Hussain, Muhammad Imran, Mohammed Assiri, Muhammad Fayyaz Ur Rehman, Chenxi Wang, Changrui Lu. Key Electronic, Linear and Nonlinear Optical Properties of Designed Disubstituted Quinoline with Carbazole Compounds. Molecules. 2021; 26 (9):2760.

Chicago/Turabian Style

Bakhat Ali; Muhammad Khalid; Sumreen Asim; Muhammad Usman Khan; Zahid Iqbal; Ajaz Hussain; Riaz Hussain; Sarfraz Ahmed; Akbar Ali; Amjad Hussain; Muhammad Imran; Mohammed Assiri; Muhammad Fayyaz Ur Rehman; Chenxi Wang; Changrui Lu. 2021. "Key Electronic, Linear and Nonlinear Optical Properties of Designed Disubstituted Quinoline with Carbazole Compounds." Molecules 26, no. 9: 2760.

Journal article
Published: 12 August 2020 in Energy
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In this study, the CO2 adsorption capacity was measured on Malaysian sub-bituminous coals in dry and moisture equilibrated state using volumetric technique to understand its carbon sequestration and storage potential. The CO2 adsorption capacity onto dry and wet coal samples was performed at 300–348K and 6 MPa. Four coal specimens, namely S1, S2, S3 and S4 were analysed by using BET, XRD and FESEM techniques before and after CO2 adsorption. The dry S3 coal showed had the highest CO2 adsorption capacity 1.59 mmolg-1 at 300 K and 6 MPa among all samples. FTIR spectra patterns explain this behaviour as they show an excessive presence of hydroxyl and carboxyl functional groups in wet coal samples. The functional group analysis of all the wet coal samples exposed to CO2 showed significantly declined adsorption relative to their corresponding dry samples. The mineral phases were identified within all fresh and wet exposed coal samples to CO2 through XRD analysis. The S3 coal had the highest selectivity of CO2 over CH4 and N2 gases at pressures up to 6 MPa. The bituminous Malaysian coal has a high affinity to adsorb CO2 in dry and wet conditions.

ACS Style

Mustafa Abunowara; Suriati Sufian; Mohamad Azmi Bustam; Usama Eldemerdash; Humbul Suleman; Roberto Bencini; Mohammed Ali Assiri; Sami Ullah; Abdullah G. Al-Sehemi. Experimental measurements of carbon dioxide, methane and nitrogen high-pressure adsorption properties onto Malaysian coals under various conditions. Energy 2020, 210, 118575 .

AMA Style

Mustafa Abunowara, Suriati Sufian, Mohamad Azmi Bustam, Usama Eldemerdash, Humbul Suleman, Roberto Bencini, Mohammed Ali Assiri, Sami Ullah, Abdullah G. Al-Sehemi. Experimental measurements of carbon dioxide, methane and nitrogen high-pressure adsorption properties onto Malaysian coals under various conditions. Energy. 2020; 210 ():118575.

Chicago/Turabian Style

Mustafa Abunowara; Suriati Sufian; Mohamad Azmi Bustam; Usama Eldemerdash; Humbul Suleman; Roberto Bencini; Mohammed Ali Assiri; Sami Ullah; Abdullah G. Al-Sehemi. 2020. "Experimental measurements of carbon dioxide, methane and nitrogen high-pressure adsorption properties onto Malaysian coals under various conditions." Energy 210, no. : 118575.

Journal article
Published: 28 March 2019 in BMC Chemistry
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A facile and convenient method for the synthesis of acridines and its derivatives was developed through one-pot, three-component condensation reaction of aromatic aldehydes, 5,5-dimethyl-1,3-cyclohexanedione, aryl amines or ammonium acetates in the presence of a catalytic amount of cobalt-alanine metal complex using aqueous ethanol as a reaction medium is reported. The present described novel methodology offers several advantages over the traditional methods reported in the literature, such as mild reaction conditions, inexpensive catalyst, short reaction times, excellent yields of products, simplicity and easy workup are the advantages of this procedure.

ACS Style

M. Mujahid Alam; Ahmed T. Mubarak; Mohammed A. Assiri; S. Merajuddin Ahmed; Ahmed M. Fouda. A facile and efficient synthesis of 1,8-dioxodecahydroacridines derivatives catalyzed by cobalt–alanine metal complex under aqueous ethanol media. BMC Chemistry 2019, 13, 40 -10.

AMA Style

M. Mujahid Alam, Ahmed T. Mubarak, Mohammed A. Assiri, S. Merajuddin Ahmed, Ahmed M. Fouda. A facile and efficient synthesis of 1,8-dioxodecahydroacridines derivatives catalyzed by cobalt–alanine metal complex under aqueous ethanol media. BMC Chemistry. 2019; 13 (1):40-10.

Chicago/Turabian Style

M. Mujahid Alam; Ahmed T. Mubarak; Mohammed A. Assiri; S. Merajuddin Ahmed; Ahmed M. Fouda. 2019. "A facile and efficient synthesis of 1,8-dioxodecahydroacridines derivatives catalyzed by cobalt–alanine metal complex under aqueous ethanol media." BMC Chemistry 13, no. 1: 40-10.