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RISS 인기검색어
- 검색키워드
- 저자 : M. Mubarak Ali (검색결과 3 건)
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M. Mubarak Ali,D. John Williams 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
PCz (polycarbazole)/SnO2/graphene oxide (GO) ternary nanocomposite, PTG, was successfully synthesized viafacile chemical route. The synthesized nanocomposite was characterized in detail by using various advanced techniques. Theeffects of annealing on the micro structure, phase composition, and photocatalytic performance of PTG correlated withphotoluminescence (PL) and electrochemical impedance (EIS) spectrum were investigated. The UV-DRS spectra disclosethat the absorption is red shifted owing to the effect of annealing and the band gap of annealed PTG were decreased from3.60 eV to 3.47 eV. The surface area of annealed PTG is 36.50 m2/g which is 3.9 times higher than the unannealed (9.30 m2/g). The annealed PTG shows flake like morphology accompanied by low degree of aggregation and demonstrated superiorphotodegradation efficiency against congo red (CR) dye under UV (95.9 %) and natural day light (98.4 %) irradiations. Thephotodegradation rate (k) of annealed PTG is 0.06584 which is two times larger than that of unannealed under the identicalconditions. The radical trapping experiment demonstrated that the holes (h+) and superoxide (*O2−) played a dominant role inthe photodegradation of CR dye. Furthermore, the possible mechanism is established by identifying the radicals involved inphotodegradation. In addition, the material demonstrated excellent stability after five consecutive cycles with only a 4-6 %loss in photo catalytic efficiency. Total organic carbon analysis shows the removal percentage of 64.6 % (UV) and 76.9 %(natural daylight) towards CR dye. The work presented here provides new platform which throw light into the practicalapplications of the ternary based nano composite in the field of photocatalysis.
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Yasser Ali Kamal, M.Sc.,Yasser Shaban Mubarak, M.D.,Ashraf Ali Alshorbagy, M.D. 대한흉부외과학회 2016 Journal of Chest Surgery (J Chest Surg) Vol.49 No.3
Background: A previous percutaneous coronary intervention (PCI) may affect the outcomes of patients who undergo coronary artery bypass grafting (CABG). The objective of this study was to compare the early in-hospital postoperative outcomes between patients who underwent CABG with or without previous PCI. Methods: The present study included 160 patients who underwent isolated elective on-pump CABG at the department of cardiothoracic surgery, Minia University Hospital from January 2010 to December 2014. Patients who previously underwent PCI (n=38) were compared to patients who did not (n=122). Preoperative, operative, and early in-hospital postoperative data were analyzed. The end points of the study were in-hospital mortality and postoperative major adverse events. Results: Non-significant differences were found between the study groups regarding preoperative demographic data, risk factors, left ventricular ejection fraction, New York Heart Association class, EuroSCORE, the presence of left main disease, reoperation for bleeding, postoperative acute myocardial infarction, a neurological deficit, need for renal dialysis, hospital stay, and in-hospital mortality. The average time from PCI to CABG was 13.9±5.4 years. The previous PCI group exhibited a significantly larger proportion of patients who experienced in-hospital major adverse events (15.8% vs. 2.5%, p=0.002). On multivariate analysis, only previous PCI was found to be a significant predictor of major adverse events (odds ratio, 0.16; 95% confidence interval, 0.03 to 0.71; p=0.01). Conclusion: Previous PCI was found to have a significant effect on the incidence of early major adverse events after CABG. Further large-scale and long-term studies are recommended.
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Xin Xiong Chang,Nabisab Mujawar Mubarak,Shaukat Ali Mazari,Abdul Sattar Jatoi,Awais Ahmad,Mohammad Khalid,Rashmi Walvekar,E.C. Abdullah,Rama Rao Karri,M.T.H Siddiqui,Sabzoi Nizamuddin 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
The concept of green chemistry has attracted attention due to the green synthesis and ecofriendly natureof the compounds leading to the green and sustainable chemical industries and processes. Chitosan is anecofriendly material, which is biodegradable, non-toxic, and biocompatible. It has the potential to bemodified into biofilms for various applications such as biomedical, packaging, and pharmaceutical fields. Nevertheless, some poor properties of chitosan restrict its wide applications. The incorporation ofnanocellulose fillers into chitosan matrix can enhance the mechanical and thermal properties of chitosan. Cellulose nanomaterials can be achieved through chemical and mechanical modifications. The commontype of nanocellulose are cellulose nanofibers (CNFs), cellulose nano-whiskers (CNWs), tunicate CNCs (t-CNCs), algae cellulose particles (AC) and bacterial cellulose particles (BC). Nanocellulose are applied asthe reinforcement fillers in various polymer matrices such as polysaccharides, proteins, lipids, polylacticacid etc. Deep eutectic solvents (DES) are relatively novel green solvents, which can be applied in variousfields. DES are widely applied in metal processing, polymer processing and synthesis. Even though thereare not much studies available on DES for synthesis of nanocomposite films; however they are used aseco-friendly solvents in manufacturing processes. This study reviews the discovery, structure, propertiesof chitosan and cellulose, their derivatives and applications. In addition, the paper also discusses theproperties of DES and their applications.
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