Effect of Heat Treatment on Langmuir−Blodgett Films of a C60 Adduct

Abstract

A thermal dissociation method was employed to fabricate the Langmuir−Blodgett (LB) films of C60. A C60 adduct with an amphiphilic anthracene bearing a carboxylic group (C60−AN) was synthesized as the precursor molecule. C60−AN formed a monolayer at the air−water interface. The monolayers were transferred on solid substrates to form LB films using a horizontal lifting method. The LB films were subjected to heat treatments and their structural change was investigated by using UV−visible and IR spectroscopies. Most of the C60−AN molecules were dissociated to C60 and amphiphilic anthracenes at 100 °C, followed by the exclusion of the anthracene moiety from the LB films. The thermal dissociation proceeded more at higher temperatures. At 200 °C, the dissociation proceeded completely, although a certain form of hydrocarbon remained in the LB films. All the materials disappeared when the films were heated above 350 °C.

Unveiling the complex glassy dynamics of square shoulder systems: Simulations and theory

“…Despite the simplicity of the model, its dynamical behaviour close to the glass transition had largely remained unexplored, while its thermodynamic phase diagram showing the presence of many crystal phases has been addressed in a number of publications. [44][45][46] The recent predictions by MCT of a unique behaviour of the glass transition for the SS model 30 is the motivation for the present work. Given the amount of effort requested to elucidate the various aspects of both liquid-glass transition and glass-glass lines, we have focused on a single value of the width of the SS model, referring to future studies to address the dependence on of the results presented here.…”