Abstract
Nanocomposites prepared by casting method with different percentages of nano magnesium oxide (0, 1.5, 3, 4.5 and 6) wt%.The structural and electrical properties of (PAA-CMC-MgO) nanocomposites were studied.The experimental results of Scanning electron microscopy shows the surface morphology of the (PAA-CMC-MgO) nanocomposites where many aggregates or chunks randomly distributed on the top surface, homogeneous and coherent.The D.C electrical conductivity for (PAA-CMC-MgO) nanocomposites increased with increasing of temperature and magnesium oxid nanoparticles concentration, while activation energy decreases with increasing of the magnesium oxid nanoparticles concentration.The A.C electrical properties show that the dielectric constant and dielectric loss of the nanocomposites decrease with increasing the frequency of applied electrical field and they increase with the increase of the concentration of the magnesium oxide nanoparticles. The A.C electrical conductivity increases with increasing the concentration of magnesium oxide nanoparticles and also increases with the increase frequency, as well as almost constant at high frequency.The results of sensor application showed that the electrical resistance of (PAA-CMC-MgO) nanocomposite decreases with increases in pressure.
Highlights
Nanocomposites were prepared by the method of casting with different proportion of nano magnesium oxide (0, 1.5, 3, 4.5 and 6) wt%.The structural and electrical properties of (PAA-carboxy methyl cellulose (CMC)-MgO) nanocomposites were studied.The experimental results of Scanning electron microscopy shows the surface morphology of the (PAA-CMC-MgO) nanocomposites where many grouping or pieces randomly dole out on the top of surface, homogeneous and coherent
The D.C electrical conductivity for (PAA-CMCMgO) nanocomposites increased with increasing of temperature and magnesium oxid nanoparticles concentration, while activation energy decreases with increasing of the magnesium oxid nanoparticles concentration
The results indicate that the MgO nanoparticles tended to form aggregates and good dispersed at (PAA-CMC-MgO) nanocomposites films as shown in the Figure 1 (B,C,D and E).When adding 6 wt.% of MgO nanoparticles to (PAA-CMC) composites, it form a continuous network inside the polymer[10], [11]
Summary
Nanotechnology involves is the science which includes the investigation and design of materials or devices at the atomic and molecular levels.nanotechnology deals with structure 100 nanometers or smaller, and involves developing materials or devices within that size [1], [2]. Piezoelectric sensors separate into two huge groups relying on their fundamental physical effects: (i) Sensors in the first group use a straight-line piezo effect. They are used for determining dynamic and quasistatic pressure, linear and vibrating accelerations, as well as parameters of sound and supersonic fields, etc. (ii) The second but no less general category of sensors concerns the so-called resonant piezo transducers, which use the return piezo effect. They are resonant sensors from piezoelectric resonators, and they can make straight-line piezo effects. Other physical effects can be used, e.g., thermosensitivity, acoustosensitivity, etc [5]
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