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Synergistic effect of organic and inorganic nano fillers on the dielectric and mechanical properties of epoxy composites

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Journal of Materials Science & technology 2018年第12期34卷 2424-2430页

作者： Muhammad Khan Aqeel A.Khurram tiehu Li tingkai Zhao t.subhani I.H.Gul Zafar Ali Vivek Patel Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications School of Materials Science and EngineeringNorthwestern Polytechnical University Laboratory for Advance Materials Processing NCP ComplexIslamabadPakistan Department of Materials Science and Engineering Institute of Space Technology School of Chemical and Materials Engineering NUSTIslamabadPakistan

titanium oxide tiO;/epoxy and tiO;with detonation nano-diamond（DND）/epoxy nanocomposites were prepared by using ultrasonication method. tiO;and DND particles as reinforcement species and epoxy as matrix were used to produce nanocomposites. the addition of DND particles into tiO;/epoxy composite improved the dielectric and mechanical properties of nanocomposites in significant *** dielectric properties of tiO;-DND/epoxy nanocomposite demonstrated increase in permittivity and conductivity after addition of the DND particles. the maximum and minimum reflection losses of tiO;-DND/epoxy nanocomposite for 0.6 and 0.2 wt% DND loading were detected at -14.5 and -1.3 dB,respectively. the flexural and tensile strength of tiO;-DND/epoxy nanocomposites with the addition of 0.4 wt% DNDs were enhanced to 220% and 223%, respectively. Additionally, the energy to break and percent break strain were 3.9 J and 3.86, respectively for 0.4 wt% DND loading in tiO;-DND/epoxy nanocomposite. therefore, the present work findings claim that DND particles are well suitable to enrich the dispersion of tiO;nanoparticles in epoxy matrix, which develops a strong load transfer interface between the nanoparticles and epoxy matrix and consequently leads to superior properties.

关键词： Epoxy nanocomposite Dispersion Mechanical and dielectric properties

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Performance of Different Cultivars in Direct Seeded Rice (<i>Oryza sativa</i>L.) with Various Seeding Densities

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American Journal of Plant Sciences 2014年第21期5卷 3119-3128页

作者： Asif Ameen Zubair Aslam Qamar Uz Zaman Ehsanullah Shahid Ibne Zamir Imran Khan Muhammad Junaid subhani Department of Agronomy University of Agriculture Faisalabad Pakistan Department of Agronomy College of Agronomy & Biotechnology China Agricultural University Beijing China Department of Entomology University of Agriculture Faisalabad Pakistan

Optimum seeding density is necessary to achieve the production potential of a cultivar in all crops. to investigate the performance of different cultivars in direct seeded rice in response to various seeding densities, a field experiment was conducted at Agronomic Research Area, University of Agriculture, Faisalabad during the kharif 2012. Super basmati (fine rice) and KSK-133 (coarse rice) were sown using seeding densities of 30, 45, 60 and 75 kg·ha-1. Results indicated that leaf area index and crop growth rate varied among rice cultivars as well as various seeding densities. the growth of rice at seeding density of 75 kg·ha-1 was higher than rest of treatments. the response of rice yield and its components like number of productive tillers, number of kernels per panicle and 1000-kernal weight differed significantly under the influence of cultivars and various seeding densities. Seeding density of 75 kg·ha-1 remained superior for both rice cultivars regarding final yield. this treatment furnished kernel yields of 3.83 and 5.49 t·ha-1 in fine and coarse rice, respectively which were significantly higher than other treatments. However, Kernel quality was improved in terms of lower number of sterile and chalky kernels at lower seeding densities (30 kg·ha-1). Based on these findings, it is concluded that using seeding density of 75 kg·ha-1 for direct seeded fine and coarse rice cultivars is beneficial in terms of better growth and higher yield but kernel quality is reduced by increasing the seeding density.

关键词： Seeding Density Direct Seeded Rice Leaf Area Index Kernel Quality

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