title: Cobalt (II) chloride promoted formation of honeycomb patterned cellulose acetate films.
abstract: CoCl(2) containing honeycomb patterned films were prepared from cellulose acetate (CA)/CoCl(2)/acetone solutions by the breath figure method in a wide range of humidities. Size and pore regularity depend on the CA/CoCl(2) molar ratio and humidity. When replacing CoCl(2) with Co(NO(3))(2) or CoBr(2), no formation of ordered porosity in the cellulose acetate films is observed. According to data from scanning electron microscopy (SEM), Energy Dispersive X-ray Microanalysis (EDX), X-ray Diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy, the key role in the formation of honeycomb structures can be attributed to the physical and chemical properties of CoCl(2) - hygroscopicity, low interaction with CA, and extraction from CA/CoCl(2)/acetone solution by water droplets condensed on the surface of the CA/CoCl(2) solution. Obtained films are prospective for using in catalysis, hydrogen fuel cells, and optical sensing materials.
authors.affiliation: Department of Microtechnology and Nanoscience, BioNano Systems Laboratory, Micro- and Nanosystems Group, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. naboka@chalmers.se
authors.forename: Olga
authors.initials: O
authors.lastname: Naboka
authors.forename: Anke
authors.initials: A
authors.lastname: Sanz-Velasco
authors.forename: Per
authors.initials: P
authors.lastname: Lundgren
authors.forename: Peter
authors.initials: P
authors.lastname: Enoksson
authors.forename: Paul
authors.initials: P
authors.lastname: Gatenholm
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D006813:Humidity; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure*; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D014867:Water; D003035:Cobalt; C005062:acetylcellulose; D002482:Cellulose; C018021:cobaltous chloride