title: Fluid-like Surface Layer and Its Flow Characteristics in Glassy Nanotubes.
abstract: We show that amorphous silica and Si nanotubes can flow at room temperature under Giga-Pascal order stress when going to the nanometer scale. This creep behavior is unique for the amorphous nanotubes and is absent in crystalline Si nanotubes of similar dimensions. A core-shell model shows that there exists an approximately 1 nm thick viscoelastic "fluid-like" surface layer, which exhibits a room temperature viscosity equivalent to that of bulk glass above 1000 °C.
authors: Department of Mechanical and Aerospace Engineering, University of California, San Diego , La Jolla, California 92093, United States.
authors: Matthew C
authors: MC
authors: Wingert
authors: Department of Mechanical and Aerospace Engineering, University of California, San Diego , La Jolla, California 92093, United States.
authors: Soonshin
authors: S
authors: Kwon
authors: Department of Mechanical and Aerospace Engineering, University of California, San Diego , La Jolla, California 92093, United States.
authors: Shengqiang
authors: S
authors: Cai
authors: Department of Mechanical and Aerospace Engineering, University of California, San Diego , La Jolla, California 92093, United States.
authors: Renkun
authors: R
authors: Chen
keywords: Glass transition; core-shell model; creep strain; silica nanotube; silicon nanotube; viscoelasticity