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In this research, the effect of adding clay Nanoparticles on increasing the lifetime of glass/ epoxy composites under hydrothermal conditions has been investigated. For this purpose, samples containing 3 Vol.% of clay Nanoparticles and samples without clay Nanoparticles in resin epoxy has been manufactured for the fabrication of specimens of the tensile test using hand lay-up and vacuum bag. The specimens were placed under the hydrothermal condition of 90% humidity and 75 °C temperature for 500 hours in the incubator and were tested for tensile properties. The results show that addition of clay Nanoparticles decreases the strength of the composite by 21.39% in the newly produced samples while in a long time, these particles slow down the process of composite degradation, so that in the same environmental conditions, the strength of specimens containing clay Nanoparticles is 9% higher than the specimens without clay Nanoparticles. [ABSTRACT FROM AUTHOR]

This paper deals with the design and fabrication of an adjustable, two finger flexible miniature gripper based on porous magnetorheological nanocomposites having the adjustability of preopening of the jaw's tips and its operational study according to performance. The fabricated gripper holds the small size and lightweight objects, maintains them and releases them as required upon reducing the electrical current. The magnetic analysis has been done and magnetic simulation was conducted using Vizimag software. Lead, condensed paper, foam and silicon wafer sheets were used as under experiment materials and it was observed that the device is working properly to grip the things which have rough surfaces. For greater objects, it can be adjusted through its tips as well. In this scheme, the magnetic actuation has been used because the magnetorheological nanocomposite is the most sensitive material against the magnetic field. This type of gripper includes the simple montage, lower fabrication prices and its own lower volume as well as weight, and there is no need to apply the classic mechanical linkage inside. These types of grippers are recommended for applications in the fields of the micro electromechanical systems, especially in the holding and transporting of sensitive work pieces against scratches, fingerprints and pressure. [ABSTRACT FROM AUTHOR]