Monte Carlo simulation
is applied for the first time to understand
the growth mechanism in ZnS nanosonic particles. Particles are considered
as hard disks interacting through a square-well potential. The ZnS
cluster growth observed in nanosonic and nanoparticles is captured
by this model. The estimated binding energy in nanosonic particles
is approximately 10 times lesser than in nanoparticles. Role of acoustic
cavitations and magnetic agitations shows compact and uniform nanocrystalline
ZnS thin films with a transparent window layer for photovoltaic and
biosensor application. The approach of distortion from zinc blende
to hexagonal closed packed is observed in X-ray diffraction. A small
uniform granular morphology and grain size 50–100 nm are observed
in scanning electron microscopy. The emission spectra excited at wavelength
270 nm show a strong emission peak in the range of 330–335
nm. Transmission electron microscopy showed a particle size of 53
and 100 nm for ultrasonic chemical bath deposition and chemical bath
deposition. The ultrasonic chemical bath deposition method for nanosonic
particles is more advantageous than chemical bath deposition for nanoparticles.
The propagation of ultrasonic waves and the measurement of their velocity in solutions form an important tool for the evaluation of various acoustical and thermodynamical parameters which give an insight into the nature of miscibility and molecular interactions in polymer solutions. In the present study, the ultrasonic velocity, density, viscosity measurements have been made in 0.1 M solution using pulse echo overlap technique at 293 K at the different concentrations of polyvinyl acetate in tetrahydrofuran. Thermo-acoustical parameters viz., adiabatic compressibility, molar sound velocity, molar compressibility, expansion coefficient, acoustic impedance, van der Waals' constant and internal pressure have been computed from the experimental data. The nature of polymer/solvent interaction and the effect of concentration on the molecular interaction are studied. The nonlinear variations of polyvinyl acetate in tetrahydrofuran have been studied. The variation of ultrasonic velocity and other thermo-acoustical parameters shows nonlinear increase or decrease with molar concentration which suggest semi-compatibility of the polymer in the given solvent.
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