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In the present study we are performing simulation of simple model of twopatch colloidal particles undergoing irreversible diffusion limited clusteraggregation using patchy Brownian cluster dynamics. In addition to theirreversible aggregation of patches, the spheres are coupled with isotropicreversible aggregation through the Kern-Frenkel potential. Due to the presenceof anisotropic and isotropic potential we have also defined 3 different kindsof clusters formed due to anisotropic potential and isotropic potential only aswell as both the potentials together. We have investigated the effect of patchsize on self-assembly under different solvent qualities for various volumefractions. We will show that at low volume fractions during aggregationprocess, we end up in a chain conformation for smaller patch size while in aglobular conformation for bigger patch size. We also observed a chain to bundletransformation depending on the attractive interaction strength between thechains or in other words depending on the quality of the solvent. We will alsoshow that bundling process is very similar to nucleation and growth phenomenaobserved in colloidal system with short range attraction. We have also studiedthe bond angle distribution for this system, where for small patches only 2angles are more probable indicating chain formation, while for bundling at verylow volume fraction a tail is developed in the distribution. While for the caseof higher patch angle this distribution is broad compared to the case of lowpatch angles showing we have a more globular conformation. We are alsoproposing a model for the formation of bundles which are similar to amyloidfibers using two patch colloidal particles.

Aggregation kinetics of irreversible patches coupled with reversible isotropic interaction leading to chains, bundles and globules