Abstract
Electrospraying (electrohydrodynamic spraying) is a method of liquid atomization by electrical forces. Spraying solutions or suspensions allow production of fine particles, down to nanometer size. These particles are interesting for a wide variety of applications, thanks to their unprecedented chemical and physical behaviour in comparison to their bulk form. Knowledge of the particle size in powders is important in many studies employing nanoparticles. In this paper, the effect of some process parameters on the size of electrosprayed polyacrylonitrile particles is presented in the form of response surface model. The model is achieved by employing a factorial design to evaluate the influence of parameters on the polyacrylonitrile nanoparticle size and response surface methodology. Four electrospraying parameters, namely, applied voltage, electrospraying solution concentration, flow rate, and syringe needle diameter were considered.
Highlights
Nanoparticles are defined as particulate dispersions or solid particles with a size in the submicron range of 10–1000 nm [1]
The properties of materials with nanometer dimensions are significantly different from the same materials in bulk form
This is mainly due to the nanometer size of the materials leading to large fraction of surface atoms, high surface energy, spatial confinement, and reduced imperfections, which are much less pronounced in the corresponding bulk materials
Summary
Nanoparticles are defined as particulate dispersions or solid particles with a size in the submicron range of 10–1000 nm [1]. With dimensions going down to nanoscale, the size of the nanomaterials is comparable to the light wavelength and the mean free path of the photons This means that the photon transport within the materials is changed significantly because of photon confinement and quantization of photon transport, which leads to modified thermal properties [6, 9,10,11]. The charge and size of the droplets can be controlled to some extent by the applied voltage, electrospraying solution concentration, nozzle-collector distance, flow rate of the liquid out of the capillary nozzle, and needle diameter. Ogata et al [16] has proposed a model for the mean volume-surface diameter of the droplets generated in the cone-jet mode of electrospraying. Technology, AIS2100 model, Amirkabir University) and for all the samples, the diameter of 150 nanoparticles was measured by measurement software (manual microstructure distance measurement, Nahamin Pardazan Asia co)
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