Introduction of molecular scale porosity into semicrystalline polymer thin films using supercritical carbon dioxide

Gin, Peter; Asada, Mitsunori; Endoh, Maya K.; Gedelian, Cynthia; Lu, Toh-Ming; Koga, Tadanori
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p121908
Academic Journal
We report supercritical carbon dioxide (scCO2) technology used for forming a large degree of molecular scale porosity in semicrystalline polymer thin films. The following three steps were integrated: (i) pre-exposure to an organic solvent which melted crystalline structures but did not cause a decrease in thickness, (ii) scCO2 exposure under the unique conditions where the anomalous absorption of CO2 occurred, and (iii) subsequent quick evaporation of CO2 to preserve the swollen structures. This unified process resulted in homogenous low-density polyphenylene vinylene films (a 15% reduction in density) with the sustained structure for at least 6 months at room temperature.


Related Articles

  • Effect of the Dopant Nature on the Response of Sensor Arrays Based on Polypyrrole. Posudievskii, O.; Konoshchuk, N.; Kukla, A.; Pavlyuchenko, A.; Pokhodenko, V. // Theoretical & Experimental Chemistry;Sep2005, Vol. 41 Issue 5, p277 

    The effect of the nature of the dopant on the response of a sensor array based on films of polypyrrole under the influence of the vapor of various organic solvents was studied. It was found the electric conductivity of the polymer can both increase and decrease during the action of analytes on...

  • A computational chemical study of penetration and displacement of water films near mineral surfaces. van Duin, Adri C. T.; Larter, Steve R. // Geochemical Transactions;2001, Vol. 2, p35 

    A series of molecular dynamics simulations have been performed on organic-water mixtures near mineral surfaces. These simulations show that, in contrast to apolar compounds, small polar organic compounds such as phenols can penetrate through thin water films to adsorb on these mineral surfaces....

  • Domain size change of spinodal phase separation structure in the sol-gel derived TiO2 thin film. Mori, Ryohei; Takahashi, Masahide; Yoko, Toshinobu // Journal of Materials Research;Jan2006, Vol. 21 Issue 1, p270 

    TiO2 thin films were prepared with a spinodal phase separation structure ranging from hundreds of nanometers to micrometers in size by the sol-gel dip-coating method from a titanium tetraisopropoxide solution containing polyoxyethylene (20) nonylphenyl ether (NPE-20). It was possible to change...

  • In Vivo Studies of Sulphonated Polyether Ether Ketone Based Composite Bone Graft Materials. Aravind, Kalambettu; Sundar, Saravanabhavan Shanmuga; Sangeetha, Dharmalingam // Trends in Biomaterials & Artificial Organs;2014, Vol. 28 Issue 2, p52 

    Sulphonated polyether ether ketone (SPEEK) based composites have recently attracted attention as synthetic biomaterial with promising potential for various biomedical applications. This paper reports the in vivo results of two of such SPEEK based composites with demonstrated potential in in...

  • Spectroscopic Ellipsometry Applications in Advanced Lithography Research. Synowicki, R. A.; Pribil, Greg K.; Hilfiker, James N.; Edwards, Kevin // AIP Conference Proceedings;2005, Vol. 788 Issue 1, p324 

    Spectroscopic ellipsometry (SE) is an optical metrology technique widely used in the semiconductor industry. For lithography applications SE is routinely used for measurement of film thickness and refractive index of polymer photoresist and antireflective coatings. While this remains a primary...

  • Dual ring laser emission of conducting polymers in microcapillary structures. Yoshida, Y.; Nishimura, T.; Fujii, A.; Ozaki, M.; Yoshino, K. // Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p141903 

    We have demonstrated photopumped multimode laser emission from cylindrical microcavities of conducting polymer thin films, which were formed by deposition on the inside surface of the glass microcapillary with capillary action. The laser emission was characterized by narrow emission lines and a...

  • Intelligent multiparameter sensing with fiber Bragg gratings. Liqiu Men; Ping Lu; Qiying Chen // Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p071110 

    An approach to achieve intelligent sensing of multiple environmental parameters with a single-fiber sensor system is demonstrated through the use of multiplexed fiber Bragg gratings (FBGs) with coatings of different polymers and specifications. Using three FBGs of either acrylate or polyimide...

  • Self-mixing interferometry in vertical-cavity surface-emitting lasers for nanomechanical cantilever sensing. Larsson, David; Greve, Anders; Hvam, Joø M.; Boisen, Anja; Yvind, Kresten // Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG 

    We have experimentally investigated self-mixing interference produced by the feedback of light from a polymer micrometer-sized cantilever into a vertical-cavity surface-emitting laser for sensing applications. In particular we have investigated how the visibility of the optical output power and...

  • The Electro-Optic Response of a Zwitterionic Non-linear Optical (NLO) Material. Quilty, J. W.; Williams, G. V. M.; Bhuiyan, D.; Ashraf, M.; Raymond, S.; Kay, A. J. // AIP Conference Proceedings;7/23/2009, Vol. 1151 Issue 1, p79 

    Measurements of the electro-optic coefficient, r33, of a zwitterionic organic chromophore are reported. Amorphous polycarbonate and chromophore were mixed and spin-processed to obtain host-guest polymer thin films for measurement with a Teng-Man modulation eillipsometer. After poling, the films...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics