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595 results on '"Habila, Mohamed A."'

16. Facile microwave synthesis of multi-walled carbon nanotubes for modification of elastomer used as heaters

Author

Ali, Imran, Shchegolkov, Aleksandr, Shchegolkov, Aleksey, Chumak, Maksim Aleksandrovich, Viktorovich, Nashchekin Alexey, Vasilievich, Likhachev Kirill, Imanova, Gunel, Kurniawan, Tonni Agustiono, and Habila, Mohamed A.

Subjects
Metallocenes -- Usage, Chemical vapor deposition -- Electric properties -- Usage, Home appliances -- Usage, Electrical conductivity -- Usage -- Electric properties, Graphite -- Usage, Plasma physics -- Electric properties -- Usage, Elastomers -- Usage, Iron compounds -- Usage, Nanotubes -- Electric properties -- Usage, Engineering and manufacturing industries, Science and technology
Abstract

Multi-walled carbon nanotubes (MWCNTs) were synthesized by a microwave method. MWCNTs had filamentous shapes (10 [micro]m) and were intertwined in bundles (40-60 nm diameter). The rapid oxidation of MWCNTs with a loss of 90% of weight was observed from 530 to 630[degrees]C. 2% Residue was present at 630[degrees]C, which gradually decreased to 1.2% at 1000[degrees]C. In a silicone elastomer, increased thermal conductivity at a concentration of 8% MWCNTs was observed. The highest thermal conductivity of the nano-modified elastomer was 0.48 W/m[degrees]C with 8.0 wt% MWCNTs. The highest electrical conductivity was 2.4 * [10.sup.-5] S [cm.sup.-1] at 8.0 wt% MWCNTs. Both the thermal and electrical conductivities showed percolation behavior with the percolation thresholds at 6 and 5 wt%, respectively. The MWCNTs synthesized by microwave method gave a good power economy in comparison to MWCNTs obtained by chemical vapor deposition (CVD) on NiMg catalyst. Microwave-synthesized MWCNTs showed high stability at a potential of 250 V in an electrical resistance heater application due to the presence of Fe on the surface of MWCNTs. The developed heater can effectively operate at 220 V, which enables the use of the tubes in household appliances, such as heat fans, irons, and washing machines. Highlights * Synthesis of MWCNTs by microwave plasma treatment of ferrocene and graphite. * Characterization of MWCNTs by different techniques. * Concentration dependence of electro- and thermal conductivity of MWCNTs in elastomers. * Electro-physical parameters studies of elastomers modified with MWCNTs. * Heat generation studies in elastomeric matrix with MWCNTs. KEYWORDS ferrocene and graphite, heat dissipation, heaters, MWCNTs, thermal and electrical conductivities, 1 | INTRODUCTION The use of carbon nanotubes is very important in the production of functional materials. (1-3) The developed materials are being used in various applications including biomedicine, (4) [...]

Published
2023
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38. Perinatal supplementation with selenium nanoparticles modified with ascorbic acid improves hepatotoxicity in rat gestational diabetes

Author

Rady Ahmed M., Ebaid Hossam, Habila Mohamed, Hassan Iftekhar, Al-Tamimi Jameel, Alhazza Ibrahim M., Moshab Mohamed S., and ALOthman Zeid A.

Subjects
gestational rats, diabetic hepatotoxicity, selenium nanoparticles, bioactivity, therapeutic strategies, Chemistry, QD1-999
Abstract

Because of the potential bioactivities, nanoparticles have engendered hope in scientific communities for developing novel therapeutic strategies. In the present study, it was tested whether selenium nanoparticles (Se-NPs) can protect the liver in mothers with gestational diabetes (DM). The gestational rats were divided into three groups (n = 8). Group 1 (CN) received the vehicle, Group 2 (DM) received a single intraperitoneal injection of 165 mg/kg of alloxan, and Group 3 (DM + Se-NPs) received a single intraperitoneal injection of 165 mg/kg alloxan and then treated with Se-NPs at a dose of 2.5 mg/kg twice a week for 6 weeks; 1 week before gestation and continued for 5 weeks. The structure of the fabricated Se-NPs modified with ascorbic acid indicated that nano-Se was associated with a carbon matrix. The body weight of diabetic mothers was lower compared to control animals. The use of Se-NPs as a treatment has led to significant restoration of the body weight in diabetic rat mothers compared to those diabetic animals without treatment. Concentrations of alanine transaminase, aspartate aminotransferase, LDH, malondialdehyde, cholesterol, triglycerides, and glucose were significantly increased in diabetic rats, while glutathione significantly declined in comparison to control gestational rats. Interestingly, Se-NPs in DM + Se-NPs rats were found to restore all these parameters to values close to the control levels. Se-NPs could improve the histological structure of the liver in gestational rats with diabetes (DM + Se-NPs). Our data demonstrate that Se-NPs shield the liver structure and function in gestational rats against alloxan-induced diabetes.

Published
2023
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