Volume 122, April 2017
Solubility and interfacial tension of thermoplastic polyurethane melt in supercritical carbon dioxide and nitrogen
A. Primel, J. Férec, G. Ausias, Y. Tirel, J.-M. Veillé, Y. Grohens
This is a study on the solubility of supercritical carbon dioxide and nitrogen in thermoplastic polyurethane (TPU) and the surface tension of TPU/supercritical fluid interface which are of relevance to foaming of TPU with such physical blowing agents. Results of modeling using the Sanchez-Lacombe equation of state are also presented. Replacing crosslinked polyurethanes that are formed with chemical blowing agents by TPU foamed with a physical blowing agents is of particular interest due to their attractive mechanical and/or thermal insulating properties.
Volume 123, May 2017 issue
Heat capacities of supercritical fluid mixtures: Comparing experimental measurements with Monte Carlo molecular simulations for carbon dioxide-methanol mixtures
Mitchell P.E. Ishmael, Lauren B. Stutzman, Maciej Z. Lukawski, Fernando A. Escobedo, Jefferson W. Tester
This articles reports experimental values for isobaric heat capacity that were measured using a flow calorimeter for carbon dioxide-methanol mixtures in the critical region. Heat capacities were also calculated using Monte Carlo simulations and compared with the experimental values. The findings show that molecular simulations are effective as predictive tool in the experimentally challenging critical region of fluid mixtures.
Volume 124, June 2017 issue
Preparation of solid-state micro- and nanocellular acrylonitrile-butadiene-styrene (ABS) foams using sub- and supercritical CO2 as blowing agents
Tae Jun Yoon, Wonbae Kong, Dong Eui Kwon, Byung Kyu Park , Woo Il Lee, Youn-Woo Lee
This article reports on the foaming of acrylonitrile-butadiene-styrene (ABS) using sub- or supercritical carbon dioxide as physical blowing agent. To select the foaming conditions, the kinetics of carbon dioxide sorption and equilibrium solubility levels were assessed. Naocellular foams with controlled cell nucleation densities were fabricated.
Volume 125, July 2017
One-pot route for uniform anchoring of TiO2 nanoparticles on reduced graphene oxides and their anode performance for lithium-ion batteries
Dohyeon Yoon, Jieun Hwang, Dong Hyun Kim, Wonyoung Chang, Kyung Yoon Chung, Jaehoon Kim
This article describes a supercritical alcohol (isopropanol) route for the uniform anchoring of anatase TiO2 nanoparticles onto surfaces of reduced graphene oxide. The hybrid thus produced is explored as an anode for use in lithium-ion batteries and shown to be a promising anode material for large-scale Li-ion battery applications.
Volume 126, August 2017
Permeation of supercritical CO2 through perfluoroelastomers
J.C. Legros, A. Mialdun, P. Strizhak, V. Shevtsova
This article describes an experimental study and modeling of permeation of high pressure carbon dioxide in perflouroelastomer O-rings used as sealants in high pressure vessels. The study shows two distinct regimes of penetration which are characterized with pressure-dependent, and pressure-independent flux domains. Results are discussed in terms of the solution- diffusion model, and a theoretical model is developed to describe the mass transport of carbon dioxide through the elastomer over different time scales.
Volume 127, September 2017
One-pot green process for surface layering with nanodiamonds on polymer microspheres
Makoto Takafuji, Nanami Hano, Hiroto Yamamoto, Naoya Ryu, Maki Horikawa, Shoji Nagaoka, Hirotaka Ihara
This study describes surface layering of nanodiamonds on a polymer (for example, polystyrene or poly(methyl methacrylate) microspheres in supercritical carbon dioxide. The study further demonstrates that the thickness of the layered shell can be controlled. The approach provides a general methodology to prepare core-shell microspheres that may be composed of various combinations of other inorganic nanoparticle (for example titanium- or iron oxide) layered shells on a given polymer core.