Investigation of the physical abrasion of ternary polymer reinforced with nanoparticles used in medical applications

Nanocomposites are one of the most important polymeric materials that exhibit excellent biological, physical, chemical and thermal properties. Rubber based nanocomposites is one of the mast interesting field in the literatures and material science. The abrasion properties of ternary nanocomposites based on Styrene Butadiene rubber have been investigated with presence of nano aluminum oxide. The nanocomposites have been prepared by mechanical blending using two roll mills. Nano Aluminum oxide particles have been added to Styrene Butadiene rubber/Phenolic Resin binder and the abrasion properties have been surveyed. Results showed that the nano Aluminum oxide particles could enhance the abrasion resistance of matrix due to abrasive properties of nano Aluminum oxide particles. In order to better understanding the behavior of the material, optical microscopic observation and scanning electron microscopic pictures hve been conducted in this investigation that the obtained results revealed the presence of this phenomenon in abrasion properties of the ternary nanocomposite polymeric samples

Adsorption of acetone from polluted air by activated carbon derived from low cost materials

In this investigation, adsorption of acetone from air on the activated carbon derived from agricultural solid waste was studied. The best of our knowledge is to find the best activated carbons from low cost material to remove hazardous compound. The effect of adsorption temperature, initial concentration and effect of raw materials were reported. It is clear that the adsorption temperatures have the negative effect on the adsorption capacity. The adsorption capacity increases with increasing the initial concentration. Three activated carbons were prepared, one (Norit) was purchased and apricot and walnut shell were prepared by physical method and carbon dioxide and water vapor as chemical agent, respectively

Removal of m-xylene from water by impregnated activated carbon

Volatile organic compounds (VOCs) are the main matters which can pollute water therefore, must be controlled under increasingly stringent environmental regulations.This work analyses the adsorption of impregnated active carbons prepared with oak bark to remove m-xylene from aqueous solutions. When the impregnation step is performed on the raw material then carbonizations of activated carbon was carried out. Not expensive raw material and chemical agent were used as active species where used for preparing the appropriate adsorbent for removal of m-xylene from water. In this work the effect of adsorption temperature, pH and the initial concentration of process were investigated. It is clear that with increasing the initial concentration the removal efficiency of adsorption will be increased. The effect of temperature was studied by increasing the temperature from 20 to 60 °C. with increasing the temperature the removal efficiency will be increased in the range of 20-60 °C

Investigation of the removal of heavy hazardous metals by agricultural solid waste as an cheap reliable adsorbent

It is well-recognized that the heavy metals are among the prominent contaminants in aqueous solutions. This hazardous metal can result in a high risk contamination and causes illness. It should be mentioned that the metals also appears in wastewaters of a lot of manufacture and it can produce variety of undesirable effects. For removal of this contaminant from water many methods are used in this way. This paper investigates adsorption Sr (II) from aqueous solutions is the most important aim of this paper. A low cost adsorbent which prepared by hazelnut shell as an agricultural solid waste was used in this study. The best of our knowledge is to use solid waste as an adsorbent without converting it to activated carbon, just by simple method. Some operational conditions such as temperature, speed velocity of stirrer and dose of prepared adsorbent were investigated by some experiments. The high efficiency adsorption was achieved by this low cost adsorbent. The raw material in this research was collected from Iranian garden

Investigation of the morphological properties of medical-used natural rubber composites reinforced with nano Iron oxide nanoparticles

Polymer matrix nanocomposites are one of the most important polymeric materials that exhibit very good mechanical and thermal properties. These materials have applications in medical goods. In this paper nanocomposites based on natural rubber and solid epoxy polymeric resin reinforced with nano-sized iron oxide (Fe2O3) nanopatricles are prepared via mechanical blending method. Indeed the melt mixing process by two roll mills are used in this investigation to prepare a well-dispersed nanocomposite samples. In these compounds, dispersion and distribution of nano iron oxide in the natural rubber / solid epoxy resin matrix are investigated. We investigate the morphology of natural rubber / solid epoxy resin/nano iron oxide nanocomposites by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results of morphological observations of present investigation showed that the presence of nano iron oxide has almost been distributed in the natural rubber matrix

On the functional limitation in below elbow amputation men using Mechanical and Myoelectric prosthesis via TAPES questionnaire

It is well established that the Myoelecterical prosthesis must also be effective, smart, light, strong and high permanence, compared to those of Mechanical prosthesis. It is time consuming and expensive that has ultimately led to significant increases in the price of Myoelecterical prosthesis. Therefore, considering the high cost of these prostheses should be decrease the functional limitation, hence assessment the functional limitations between two groups must be clear and explicit. Therefore this study was conducted in this regard. In this descriptive cross-sectional analytical study, to groups compared to each other from quality of life, participants was two groups of 20 below elbow amputation veterans that use from Mechanical or Myoelectrical prosthesis that refer to central technical orthopedic Kosar. For gathering the data we use TPEAS questionnaire. This questionnaire evaluates participants from 3 items: psychosocial adaptation, functional limitation and satisfaction of life. For data analysis use to t independent and ANOVA test. This research showed that there are significant differences between two groups from functional limitation. The findings identified that the Myoelecterical groups have lower functional limitation in compare to Mechanical group. So that the hypothesis of this research in terms of lower functional limitation in the Myoelecterical group was accepted. Keivani Hafshejani mA, Sattari Naeini M, Langari A. On the functional limitation in below elbow amputation men using Mechanical and Myoelectric prosthesis via TAPES questionnaire. Life Sci J 2012;9(4):5579-5582] (ISSN: 1097-8135). http://www.lifesciencesite.com. 82

The comparison of satisfaction of prosthesis in below amputation men using a mechanical and Myoelectric prosthesis by using of TAPES questionnaire

Design and manufacturing of the Myoelecterical prosthesis (in compared to Mechanical prosthesis) is time consuming and expensive. Therefore, considering the high cost of these prostheses should be increase the satisfaction of prosthesis. This study was conducted on assessing the quality of life between two groups. The two groups compared from the aspect of quality of life. The participants were categorized in two groups of 20 below elbow amputation veterans that use from Mechanical or Myoelectrical prosthesis that refer to central technical orthopedic Kosar. For gathering the data we use TPEAS questionnaire. This questionnaire evaluates participants from 3 items: psychosocial adaptation, functional limitation and satisfaction of life. For data analysis use to t independent and ANOVA test. The obtained results revealed that there are significant differentiations in prosthesis satisfaction. This identified that the Myoelecterical groups have upper prosthesis satisfaction in compare to Mechanical group. Therefore the hypothesis of this research in terms of higher satisfaction in the Myoelecterical group was accepted. Keivani Hafshejani mA, Sattari Naeini M, Langari A. The comparison of satisfaction of prosthesis in below amputation men using a mechanical and Myoelectric prosthesis by using of TAPES questionnaire. Life Sci J 2012;9(4):5588-5592] (ISSN: 1097-8135). http://www.lifesciencesite.com. 83