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ZnO/TiO2 Nanocomposite Synthesized by Sol Gel from Highly Soluble Single Source Molecular Precursor

Chinese Journal of Chemical Physics 2014年第5期27卷 548-554,I0003页

作者： Hameed Ullah kabeer ahmad khan Wasid Ullah khan 巴基斯坦哈扎拉大学化学系曼塞赫拉

Single source molecular precursors （SSPs） provide an opportunity to get control over the microstructure of nanomaterials at atomic level. A SSP was designed and developed for the synthesis of ZnO/TiO2 nanocomposite by sol gel method. In a typical synthe-sis process, a bimetallic molecular compound with chemical formula [Cl2TiZn（dmae）4] （dmae=dimethylaminoethanol） was synthesized and its chemical composition was deter-mined by elemental analysis. The obtained compound has shown excellent solubility in common organic solvents, a prerequisite for its use in sol gel method as SSP. The SSP ob-tained was controllably hydrolyzed by adding equimolar amount of water using ethanol as solvent to get ZnO/TiO2 nanocomposite gel. The resulting gel was precipitated at pH=9 and sintered at 200 ℃ （T200）, 400℃ （T400）, and 600℃ （T600）. The XRD analyses have shown that the as synthesized （non-sintered, T00） powder was amorphous. However, the crystallinity improved upon sintering, and the XRD analyses revealed that the resulting nanomaterials were composed of mixed oxides i.e., ZnO and TiO2. The ZnO was in wurtzite （hexagonal） while the TiO2 was in brookite （orthorhombic） phase. The increase in particlesize was further confirmed from BET analysis and SEM micrographs. The IR spectra ob-tained for the resulting powder have shown the peculiar vibrational bands for Zn-O and Ti-O. Furthermore, the IR spectra revealed that the non-sintered ZnO/TiO2 nanocomposite had significant number of OH group which was removed upon sintering. The photocatalytic activities of the ZnO/TiO2 nanocomposites were tested. All the samples have shown good photocatalytic activities. However, the T400 has shown higher activity than the T00, T200, and T600. The higher photocatalytic activity of T400 than T00, T200, and T600 may be due to improved crystallinity which ensures efficient grain boundary interfaces.

关键词： Single source precursor Sol gel ZnO/TiO2 Methyl orange Photocatalytic activity

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Case Reports in Clinical Medicine 2020年第9期9卷 303-309页

作者： Fahad Almuhanna ahmad Al-Shami Mohammad Almousa Yaser M. Ali Department of Medicine Mubarak Al Kabeer Hospital Kuwait City Kuwait

IgG4-related disease (IgG4-RD) is a multisystem autoimmune disease that can affect different organs of the body. Commonly, it affects the pancreas, salivary glands and the orbit. It is known that it can be diagnosed when there is an established correlation between clinical findings, IgG4 level and histopathology. In our case report, we present a case of a 38-year-old male patient who was suffering from uncontrolled asthma for 7 years before diagnosing him with IgG4 related disease confirmed by lacrimal gland biopsy.

关键词： Asthma IgG4 Autoimmune

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Open Journal of Rheumatology and Autoimmune Diseases 2021年第1期11卷 19-27页

作者： Mohammad Al Mousa Fahad Al Muhanna ahmad Al Shami Yaser M. Ali Department of Medicine Mubarak Al Kabeer Hospital Kuwait City Kuwait

IgG4 related disease is a relatively recently recognized systemic entity, that has been observed in nearly every organ system, with similar histopathological features across all identified organs. IgG4 is an antibody molecule accounting for less than 5% of the total IgG count in a healthy person. The molecule is implicated in numerous autoimmune diseases;however its role in IgG4 related disease, whether primary or secondary, remains unknown. The gold standard in the diagnosis of this condition is demonstration of organ involvement from biopsy specimens. In this case report, the patient had exhibited symptoms related mainly to the gastrointestinal tract for 12 years prior to his diagnosis of IgG4 related disease. After this patient’s diagnosis of IgG4 related disease, he was commenced on Rituximab, a monoclonal antibody, which was successful in subsiding his symptoms and he has remained symptom free for the past two years of follow up since commencing treatment and hadn’t developed any complications of the disease nor any complications related to treatment. IgG4 related disease is a systemic autoimmune disease that involves multiple organs 60% - 90% of the time, therefore clinicians should be aware that IgG4 related disease can mimic some autoimmune rheumatic diseases and place it as a differential diagnosis when multi-organ disease with systemic features is involved.

关键词： IgG4 Related Disease Autoimmune Disease Rituximab

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