### Core-and-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 0.1 nm.
• The incident angles are $\alpha_i = 0.2 ^{\circ}$ and $\varphi_i = 0^{\circ}$.
  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  #!/usr/bin/env python3 """ Core shell nanoparticles """ import bornagain as ba from bornagain import ba_plot as bp, deg, nm, std_samples def get_sample(): """ Returns a sample with box-shaped core-shell particles. """ # Define materials material_Core = ba.RefractiveMaterial("Core", 6e-5, 2e-8) material_Shell = ba.RefractiveMaterial("Shell", 1e-4, 2e-8) # Define form factors ff_1 = ba.Box(12*nm, 12*nm, 7*nm) ff_2 = ba.Box(16*nm, 16*nm, 8*nm) # Define particles core = ba.Particle(material_Core, ff_1) shell = ba.Particle(material_Shell, ff_2) particle = ba.CoreAndShell(shell, core) return std_samples.sas_sample_with_particle(particle) def get_simulation(sample): beam = ba.UnitBeam(0.1*nm, 0.2*deg) detector = ba.SphericalDetector(bp.simargs['n'], 2*deg, 0, 1*deg) simulation = ba.ScatteringSimulation(beam, sample, detector) return simulation if __name__ == '__main__': bp.parse_args(sim_n=200) sample = get_sample() simulation = get_simulation(sample) result = simulation.simulate() bp.plot_simulation_result(result) 
Examples/scatter2d/CoreShellNanoparticles.py

Validated through an alternative implementation that uses particle composition, Examples/scatter2d/CoreShellNanoparticles2.py .