Mechanical reinforcement of polymer colloidal crystals by supercritical fluids

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:579

Article

Babacic, Visnja¹  Varghese, Jeena¹  Coy, Emerson²  Kang, Eunsoo³  Pochylski, Mikolaj¹  Gapinski, Jacek¹  Fytas, George³  Graczykowski, Bartlomiej^1,3 

[1] Adam Mickiewicz Univ, Fac Phys, Uniwersytetu Poznanskiego 2, PL-61614 Poznan, Poland

[2] Adam Mickiewicz Univ, NanoBioMed Ctr, Wszechnicy Piastowskiej 3, PL-61614 Poznan, Poland

[3] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany

关键词: Colloidal crystals;    Plasticization;    Brillouin light scattering;    Phononic crystals;    Photonic crystals;   

DOI  :  10.1016/j.jcis.2020.06.104

来源: Elsevier

【 摘 要 】

Colloidal crystals realized by self-assembled polymer nanoparticles have prominent attraction as a platform for various applications from assembling photonic and phononic crystals, acoustic metamaterials to coating applications. However, the fragility of these systems limits their application horizon. In this work the uniform mechanical reinforcement and tunability of 3D polystyrene colloidal crystals by means of cold soldering are reported. This structural strengthening is achieved by high pressure gas (N-2 or Ar) plasticization at temperatures well below the glass transition. Brillouin light scattering is employed to monitor in-situ the mechanical vibrations of the crystal and thereby determine preferential pressure, temperature and time ranges for soldering, i.e. formation of physical bonding among the nanoparticles while maintaining the shape and translational order. This low-cost method is potentially useful for fabrication and tuning of durable devices including applications in photonics, phononics, acoustic metamaterials, optomechanics, surface coatings and nanolithography. (C) 2020 The Authors. Published by Elsevier Inc.

【 授权许可】

Free