Properties of superhydrophobic paper treated with rapid expansion of supercritical CO2 containing a crystallizing wax
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology
Article in journal (Refereed)
Cellulose (London)(ISSN 0969-0239)(EISSN 1572-882X)
Paper, Pulp and Fiber Technology
Cellulose and paper engineering
Superhydrophobic, Supercritical fluids, RESS, AKD, Paper, Carbon, dioxide, Crystallization, carbon-dioxide, contact-angle, surfaces, wettability, water, fluids, slip
Paper samples were rendered superhydrophobic with Alkyl Ketene Dimer using (1) Airblasting with cryo ground micro particles, (2) crystallizing from organic solvents and (3) spraying with Rapid Expansion of Supercritical Solutions (RESS) technique. The papers were characterized using Scanning Electron Microscopy, contact angle to water measurements and X-ray Photoelectron Spectroscopy (XPS). Advancing contact angles were in the region of 150A degrees-160A degrees and receding contact angles were in the region of 110A degrees-130A degrees. Diagrams showing the drop base diameter vs. the contact angle when water is pumped into, and then withdrawn from, a sessile drop show that a stick slip pattern is present in the advancing phase for a non coated internally sized paper. Papers rendered superhydrophobic with the RESS technique showed a much less pronounced stick slip pattern in the advancing phase but still a stick slip pattern in the receding phase.