title: Anomalous diffusion and diffusion anomaly in confined Janus dumbbells.
abstract: Self-assembly and dynamical properties of Janus nanoparticles have been studied by molecular dynamic simulations. The nanoparticles are modeled as dimers and they are confined between two flat parallel plates to simulate a thin film. One monomer from the dumbbells interacts by a standard Lennard-Jones potential and the other by a two-length scales shoulder potential, typically used for anomalous fluids. Here, we study the effects of removing the Brownian effects, typical from colloidal systems immersed in aqueous solution, and consider a molecular system, without the drag force and the random collisions from the Brownian motion. Self-assembly and diffusion anomaly are preserved in relation to the Brownian system. Additionally, a superdiffusive regime associated to a collective reorientation in a highly structured phase is observed. Diffusion anomaly and anomalous diffusion are explained in the two length scale framework.
authors.affiliation: Centro Araranguá, Universidade Federal de Santa Catarina, Rua Pedro João Pereira, 150, CEP 88905-120 Araranguá, SC, Brazil.
authors.forename: Leandro
authors.initials: L
authors.lastname: B Krott
authors.affiliation: Instituto de Física, Univeridade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-570 Porto Alegre, RS, Brazil.
authors.forename: Cristina
authors.initials: C
authors.lastname: Gavazzoni
authors.affiliation: Campus Caçapava do Sul, Universidade Federal do Pampa, Av. Pedro Anunciação, 111, CEP 96570-000 Caçapava do Sul, RS, Brazil.
authors.forename: José Rafael
authors.initials: JR
authors.lastname: Bordin