Shaping in the Third Direction; Fabrication of Hemispherical Micro-Concavity Array by Using Large Size Polystyrene Spheres as Template for Direct Self-Assembly of Small Size Silica Spheres

Abstract

Silica and polystyrene spheres with a small size ratio (r = 0.005) form by sequential hanging drop self-assembly, a binary colloidal crystal through which calcination transforms in a silica-ordered concavity array. These arrays are capable of light Bragg diffraction and shape dependent optical phenomena, and they can be transformed into inverse-opal structures. Hierarchical 2D and 3D super-structures with ordered concavities as structural units were fabricated in this study.

Effect of tilt angle and drying temperature on the surface coverage rate of polystyrene nanospheres in evaporation-driven self-assembly process

“…Although there are concerns, such as the surface-activity of oligomers, 11 NSL is now widely used in many applications, such as photovoltaics, 12,13 plasmonics, 14,15 and biosensing. 16,17 There are many different methods to achieve well-ordered 2D structures with NS, such as spin coating, 18,19 electrophoretic deposition, 20 Langmuir-Blodgett, [21][22][23] controlled drying, [24][25][26][27] and gravity sedimentation. 28 These methods can be divided into two main categories: Direct assembly on the target substrate and pre-assembly at an interface (mainly air/water) followed by transfer to a target substrate.…”

“…There are many different methods to achieve well-ordered 2D structures with NS, such as spin coating, 18 , 19 electrophoretic deposition, 20 Langmuir-Blodgett, 21 – 23 controlled drying, 24 – 27 and gravity sedimentation 28 . These methods can be divided into two main categories: Direct assembly on the target substrate and pre-assembly at an interface (mainly air/water) followed by transfer to a target substrate 15 , 29 …”

Optical effects by opal/reverse opal structures, laser polymerizing and plasmonic Ag ultra-thin films

“…Colloidal solutions containing sub-micronic spheres can self-assembly, losing liquid by evaporation, and forming porous solid, named colloidal crystal (CC) or artificial opal (AO) [1][2][3][4][5].…”

Design and multilevel structuring of shape memory polymers for pleochroism control

“…3,4 Spontaneous structuring processes of filled polymer compositions are intensified by introducing large polystyrene and small silica spheres into a high molecular weight binder. 5 Liquid or solvent vapors sorption from the environment affects pleochroism. It has been proven that the penetration of liquid into polymer films made from block copolymers causes the appearance of a reversible structural color.…”

“…Polymeric materials with shape memory effects are used in medicine, [1][2][3][4][5][6] orthopedics, [7][8][9][10][11][12][13] and pharmacology [14][15][16][17][18] for manufacturing endoprostheses [19][20][21] and implants. 22 Fibers and films with shape memory are used as biodegradable sutures and patches pulling together living tissues of the body.…”