SPHERE FORMING BLOCK COPOLYMER THIN FILMS ON CORRUGATED SUBSTRATES

GOMEZ LR; EM VALLES; VEGA DA

Los Cocos Cordoba

Simposio; V Simposio Binacional de Polímeros Argentino-Chileno, ARCHIPOL´09I, VIII Simposio Argentino de Polímeros, SAP VIII y IX Simposio Chileno de Química y Fisicoquímica de Polímeros, CHIPOL IX; 2009

In the last years, the studies of self-assembled block copolymers have been driven by the possible applications to nanotechnology (Segalman, 2005). For example, thin-film patterns of block copolymers have been used as nanolithographic masks for pattern transfer (Harrison et al., 2000). One of the main difficulties associated to these systems is the lack of long-range order due to the presence of unavoidable topological defects (Gómez et al., 2006). At present different strategies have been employed to reduce the density of defects (Segalman, 2005). More recently, there has been an increasing interest in the study of 2D modulated phases on nonflat substrates (Nelson, 2002). One of the main differences between planar and curved 2D modulated phases is the nature of topological defects. The curvature of the substrate can impose a topological requirement involving defects in the equilibrium state. This topological requirement is given by the Gauss-Bonnet theorem which relates the integral of the Gaussian curvature with the total defects (disclination) charge (Vittelli and Turner, 2004). In this work we investigate on the possibility of using curved substrates to control the density and location of topological defects in thin films of sphere forming block copolymers.et al., 2000). One of the main difficulties associated to these systems is the lack of long-range order due to the presence of unavoidable topological defects (Gómez et al., 2006). At present different strategies have been employed to reduce the density of defects (Segalman, 2005). More recently, there has been an increasing interest in the study of 2D modulated phases on nonflat substrates (Nelson, 2002). One of the main differences between planar and curved 2D modulated phases is the nature of topological defects. The curvature of the substrate can impose a topological requirement involving defects in the equilibrium state. This topological requirement is given by the Gauss-Bonnet theorem which relates the integral of the Gaussian curvature with the total defects (disclination) charge (Vittelli and Turner, 2004). In this work we investigate on the possibility of using curved substrates to control the density and location of topological defects in thin films of sphere forming block copolymers.et al., 2006). At present different strategies have been employed to reduce the density of defects (Segalman, 2005). More recently, there has been an increasing interest in the study of 2D modulated phases on nonflat substrates (Nelson, 2002). One of the main differences between planar and curved 2D modulated phases is the nature of topological defects. The curvature of the substrate can impose a topological requirement involving defects in the equilibrium state. This topological requirement is given by the Gauss-Bonnet theorem which relates the integral of the Gaussian curvature with the total defects (disclination) charge (Vittelli and Turner, 2004). In this work we investigate on the possibility of using curved substrates to control the density and location of topological defects in thin films of sphere forming block copolymers.