TITLE

Low-density polymer thin film formation in supercritical carbon dioxide

AUTHOR(S)
Koga, Tadanori; Seo, Y.-S.; Jerome, J. L.; Ge, S.; Rafailovich, M. H.; Sokolov, J. C.; Chu, B.; Seeck, O. H.; Tolan, M.; Kolb, R.
PUB. DATE
November 2003
SOURCE
Applied Physics Letters;11/24/2003, Vol. 83 Issue 21, p4309
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report a method for producing stable low-density polymer films by using supercritical carbon dioxide (scCO[sub 2]). Two different molecular weight polystyrene films with various thicknesses were exposed to scCO[sub 2] along the density fluctuation ridge in P–T phase diagram. The swollen structures could be then frozen by flash evaporation of CO[sub 2] without forming additional voids. X-ray reflectivity data clearly showed that exposure to scCO[sub 2] could be used to produce uniform low-density films of about 2R[sub g] thick or less, where R[sub g] is radius of polymer gyration. © 2003 American Institute of Physics.
ACCESSION #
11447629

 

Related Articles

  • Soft x-ray resonant reflectivity of low-Z material thin films. Cheng Wang; Araki, T.; Ade, H. // Applied Physics Letters;11/21/2005, Vol. 87 Issue 21, p214109 

    Soft x-ray resonant reflectivity, a method for low-Z materials that combines aspects of neutron reflectivity and x-ray reflectivity, is presented. Resonant reflectivity provides enhanced and selective sensitivity to specific chemical moieties near the absorption edges of constituent elements and...

  • X-ray Phase Contrast of Laser-Heated Air Space. Bushuev, V. A.; Petrakov, A. P. // Crystallography Reports;Mar2001, Vol. 46 Issue 2, p171 

    The image of a thin cylindrical air space heated by the beam of a continuous CO[sub 2] laser has been obtained by the method of X-ray phase contrast in the scheme with a slit (cut) crystal-analyzer. It is shown that the method is extremely sensitive to superlow density values and relative X-ray...

  • Crystal structure of lithium(i) 1,1,1,-trifluoro-5,5-dimethyl-2,4-hexanedionate. Filatov, E. S.; Baidina, I. A.; Igumenov, I. K. // Journal of Structural Chemistry;May2006, Vol. 47 Issue 3, p484 

    Lithium pivalyltrifluoroacetonate has been studied by X-ray crystallography. The compound has a structure of a coordination polymer [Li(pta)]∞ with Li...Li distances of 2.74 Å. Crystal data for C16H20F6Li2O4: a = 19.151(4) Å, b = 10.723(2) Å, c = 19.801(4) Å, space group...

  • Formation of superhydrophobic surfaces by the deposition of coatings from supercritical carbon dioxide. Gallyamov, M.; Nikitin, L.; Nikolaev, A.; Obraztsov, A.; Bouznik, V.; Khokhlov, A. // Colloid Journal;Jul2007, Vol. 69 Issue 4, p411 

    The deposition of uniform coatings of fluorinated polymers from solutions in supercritical carbon dioxide on a number of rough substrates allowed superhydrophobic (ultrahydrophobic) properties to be imparted to their surfaces, and, namely, to increase the value of the contact angle for water...

  • Emerging Technologies.  // R&D Magazine;May2004, Vol. 46 Issue 5, p62 

    Presents news briefs on the emergence of various industrial technologies in 2004. Features of a polymer injection forming technique invented by Corus being used by the packaging industry; Information on a high-performance semiconducting thin films created by IBM Corp.; Details of the extraction...

  • Amorphous solid carbon dioxide. Falk, Michael // Journal of Chemical Physics;1/15/1987, Vol. 86 Issue 2, p560 

    Carbon dioxide gas condensed at 10 K was found to form amorphous solid films whose infrared spectra differ substantially from those of crystalline CO2. With the help of a sample of 13C-enriched CO2, the fundamental absorption bands of different isotopic species of CO2 in the spectra of the...

  • Cadmium-Containing Carbonic Anhydrase CDCA1 in Marine Diatom Thalassiosira weissflogii. Alterio, Vincenzo; Langella, Emma; De Simone, Giuseppina; Monti, Simona Maria // Marine Drugs;2015, Vol. 13 Issue 4, p1688 

    The Carbon Concentration Mechanism (CCM) allows phytoplakton species to accumulate the dissolved inorganic carbon (DIC) necessary for an efficient photosynthesis even under carbon dioxide limitation. In this mechanism of primary importance for diatoms, a key role is played by carbonic anhydrase...

  • Phosphorylase recognition and phosphorolysis of its oligosaccharide substrate: answers to a long outstanding question. Watson, K. A.; Cleverty, C.; Geremia, S.; Cottaz, S.; Driguez, H.; Johnson, L. N. // EMBO Journal;9/1/99, Vol. 18 Issue 17, p4619 

    Phosphorylases are key enzymes of carbohydrate metabolism. Structural studies have provided explanations for almost all features of control and substrate recognition of phosphorylase but one question remains unanswered. How does phosphorylase recognize and cleave an oligosaccharide substrate? To...

  • Red fluorescent protein DsRed: Parametrization of its chromophore as an amino acid residue for computer modeling in the OPLS-AA force field. Dmitrienko, D. V.; Vrzheshch, E. P.; Drutsa, V. L.; Vrzheshch, P. V. // Biochemistry (00062979);Oct2006, Vol. 71 Issue 10, p1133 

    Topology of the neutral form of the DsRed fluorescent protein chromophore as a residue of [(4- cis)-2-[(1- cis)-4-amino-4-oxobutanimidoyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic acid was calculated with OPLS-AA force field. Use of this topology and molecular dynamics...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics