Study on the effect of nano-silver impregnation on mechanical properties of heat-treated Populus nigra
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The present study is aimed at investigating the effect of heat treatment of nano-silver-impregnated Populus nigra on weight loss, modulus of rupture (MOR), modulus of elasticity (MOE), and compression parallel to grain. Specimens were impregnated with 200 PPM water-based solution of nano-silver particles at 2.5 bar in a pressure vessel. For heat treatment, both nano-silver-impregnated and simple specimens were kept for 24 h at 45°C and then further for 24 h at 145°C and finally for 4 h at 185°C. MOR decreased from 529 to 461 kg/cm2 in heat-treated specimens; MOE and compression parallel to grain were though improved. Also, comparison between heat-treated and nano-silver-impregnated heat-treated specimens showed that there was a decrease in MOR and MOE in nano-silver-impregnated heat-treated specimens. This shows that nano-silver impregnation facilitates transfer of heat in wood and it may increase the process of degradation and pyrolysis of wood structures in deeper parts of specimens.
The author is grateful to Dr. Mohammad Layeghi (associate professor at faculty of natural resources, The University of Tehran) for preparing nano-silver solution for the present study. Also, I would like to deeply thank Mr. Hossein Afshar, managing director of Afshar Wood-Machinery Manufacturing Co., for being instrumental in nano-silver impregnation treatment in pressure vessels.
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