Study the Thermal Properties of PVP/CuNPs Composite Prepared by Different Concentrations

Abstract

In this paper, copper nanoparticles (CuNPs) with a particle size of 40 nm were used to prepare a copper paste by using a liquid phase reduction method with Poly vinyl pyrrolidone (PVP) aqueous solutions in ethanol with different concentrations of CuNPs. Many thermal properties were characterized such as scanning electron microscopy (SEM), viscosity, thermal conductivity, PVP has properties such as a surface stabilizer, growth modifier, nanoparticle dispersant, and reducing agent. The influence of CuNPs particle volume fraction of (0.1, 0.2, 0.3 and 0.5%) with PVP on the thermal conductivity, pH and viscosity values of CuNPs./PVP were characterized. The experimental data show that the thermal conductivity of composites increases with the increase of filler. The enhancement of thermal conductivity is 62 % at 0.5% of the volume concentration at 25°C from the base PVP colloidal.

Simulation Of Solar Water Heating System In Single Family House In Various Weather By Using Polysun Programs

“…3, the foremost distinctive of the values is as a result of the management of the circulation pumps. The simulation data indicate to annual thermal efficiency on a flat-plate star collectors changes from half-hour to 12 months and agreement with the founds given for completely different authors [17,19].…”

“…This technics has been well advanced and may well be merely achieved [3]. Fortunately, the value of solar power should then be minimized in cold climate places in order to make type thermal collectors competitive [4].use solar power in hot water was one among foremost necessary sensible applications, as the use of solar energy collectors increased by more than 18% annually different process tools are designed to assess the long-term performance on star as well as outcomes trend of parameters [5]. When starting an academic degree investigation of potential using star power, it's important in determining which energy method is more appropriate for the investigation [6,8] In fact, the use of this type of energy is a good choice from the best options, as it can save 40 -60% of the total energy used in buildings.…”

Enhancement of Mechanical Properties of Hybrid Composite Materials

“…(known as a shackle) [2].One of the important using is a semi-elliptical leaf spring [3].Leaf springs made of hybrid composite materialswords. In the longitudinal direction, The best material for producing leaf springs is one that has a high strength and low modulus of elasticity.Conventional leaf spring failure is caused by an accident, which can be minimized by using progressively failed composite leaf springs [4].Weight reduction can be accomplished mainly by incorporating improved material design optimization and better manufacturing processes.Suspension leaf springs are one of the possible products for weight reduction in vehicles, with ten to twenty percent less weight than un-sprung.As a result, the standard of riding has improved [5].The key feature of spring design is to absorb and store energy before releasing it.The material's strain energy is a significant concern when designing springs.The basic strain energy can be measured using the formula [6].According to the equation above, materials with a lower density and a lower young modulus have a higher specific strain energy.The weight of the leaf spring can be decreased without losing load carrying capacity or stiffness by using composite materials.…”

The Effect of Addition Graphite Filler on Mechanical Properties of Epoxy Material

“…In addition, a lot of research uses nanomaterials in weight ratios from 1% to 5% to obtain an appropriate improvement in mechanical properties at the lowest possible cost. Sometimes the increase in filler ratio has an adverse effect on the mechanical properties due to agglomeration in the matrix materials, which leads to the appearance of heterogeneous regions in the crystal structure of the composite material [14,15] . A study by Hamad A. Al-Turaif which focused on the effect of different size of nanoparticle titanium oxide (TiO2) on the tensile strength property of epoxy resin by the same weight fraction (1.0,3.0,5.0and10.0%wt.…”

“…The result indicated best increasing tensile strength at 10%wt. by 27% compare with epoxy, then decreased when increasing amount of add particles to resin [21] tensile strength property of epoxy nanocomposites, the two kinds of SiO2NPs were used; one has particle size about (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) nm and, but the other has particle size about (220-550) nm, by two ways were prepared samples, first way, keeping the mixture under a vacuum of 30mbar for 2 hours at room temperature for degassing. The results show that the ultimate strength pure epoxy is 71.37MPa when the weight percentage were (0.3, 1.0 and 3.0) %, the ultimate strength were (83.02, 85.74 and 85.07) MPa respectively.…”