### Core shell nanoparticles

Scattering from cuboidal core-shell particles.

• The sample is made of core-shell particles whose outer and inner shells are boxes with dimensions $L_1 = W_1 = 16$ nm, $H_1 = 8$ nm and $L_2 = W_2 = 12$ nm, $H_2 = 7$ nm, respectively, where $L_i$, $W_i$ and $H_i$ are the length, width and height of box $i$.
• The smaller box is positioned so that the centres of the bottom faces of both particles coincide.
• The simulation is run using the Born approximation. There is no substrate and no interference between the different scattered beams.
• The planar distribution of the particles is diluted and random.
• The incident wavelength is equal to $1$ $\unicode{x212B}$.
• The incident angles are $\alpha_i = 0.2 ^{\circ}$ and $\phi_i = 0^{\circ}$.
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63  """ Core shell nanoparticles """ import bornagain as ba from bornagain import deg, angstrom, nm def get_sample(): """ Returns a sample with box-shaped core-shell particles on a substrate. """ # defining materials m_air = ba.HomogeneousMaterial("Air", 0.0, 0.0 ) m_shell = ba.HomogeneousMaterial("Shell", 1e-4, 2e-8 ) m_core = ba.HomogeneousMaterial("Core", 6e-5, 2e-8 ) # collection of particles parallelepiped1_ff = ba.FormFactorBox(16*nm, 16*nm, 8*nm) parallelepiped2_ff = ba.FormFactorBox(12*nm, 12*nm, 7*nm) shell_particle = ba.Particle(m_shell, parallelepiped1_ff) core_particle = ba.Particle(m_core, parallelepiped2_ff) core_position = ba.kvector_t(0.0, 0.0, 0.0) particle = ba.ParticleCoreShell(shell_particle, core_particle, core_position) particle_layout = ba.ParticleLayout() particle_layout.addParticle(particle) interference = ba.InterferenceFunctionNone() particle_layout.setInterferenceFunction(interference) air_layer = ba.Layer(m_air) air_layer.addLayout(particle_layout) multi_layer = ba.MultiLayer() multi_layer.addLayer(air_layer) return multi_layer def get_simulation(): """ Returns a GISAXS simulation with beam and detector defined. """ simulation = ba.GISASSimulation() simulation.setDetectorParameters(200, -1.0*deg, 1.0*deg, 200, 0.0*deg, 2.0*deg) simulation.setBeamParameters(1.0*angstrom, 0.2*deg, 0.0*deg) return simulation def run_simulation(): """ Runs simulation and returns intensity map. """ simulation = get_simulation() simulation.setSample(get_sample()) simulation.runSimulation() return simulation.result() if __name__ == '__main__': result = run_simulation() ba.plot_simulation_result(result) 
CoreShellNanoparticles.py