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Titolo:
Driven pattern formation in organic thin film materials: Complex mesoscopic organization in microcontact printing on Si/SiO2 via the spontaneous dewetting of a functionalized perfluoropolyether ink
Autore:
Erhardt, MK; Nuzzo, RG;
Indirizzi:
Univ Illinois, Dept Chem, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 linois, Dept Chem, Urbana, IL 61801 USA Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 pt Mat Sci & Engn, Urbana, IL 61801 USA Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 Seitz Mat Res Lab, Urbana, IL 61801 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 37, volume: 105, anno: 2001,
pagine: 8776 - 8784
SICI:
1520-6106(20010920)105:37<8776:DPFIOT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHEMICAL-VAPOR-DEPOSITION; SELF-ASSEMBLED MONOLAYERS; AMORPHOUS-HYDROGENATED CARBON; ELECTROLESS DEPOSITION; DISK OVERCOATS; SIO2 SURFACES; RIGID DISKS; END-GROUPS; LUBRICANTS; CHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Nuzzo, RG Univ Illinois, Dept Chem, 1209 W Calif St, Urbana, IL 61801 USA Univ Illinois 1209 W Calif St Urbana IL USA 61801 , IL 61801 USA
Citazione:
M.K. Erhardt e R.G. Nuzzo, "Driven pattern formation in organic thin film materials: Complex mesoscopic organization in microcontact printing on Si/SiO2 via the spontaneous dewetting of a functionalized perfluoropolyether ink", J PHYS CH B, 105(37), 2001, pp. 8776-8784

Abstract

Polyfluoropolyether (PFPE) films have long been used as lubricant coatingsfor magnetic recording media. In this paper, we demonstrate that the unique wetting properties of PFPEs-more specifically, the dynamical organizations that result from spontaneous dewetting-can be harnessed to generate mesoscopically patterned features of these materials on SiO2. In this work, a functionalized PFPE amphiphile with the formula CF3CF2CF2O(CF(CF3)CF2O)(n)CF(CF3)CONECH2CH2CH2Si(OCH3)(3) (Krytox SA, DuPont) was deposited on a SiO2 surface by both spin-casting and contact printing. Both methods produce complex surface structures comprised of beaded domains and depletion regions (and in the case of spin-casting, also thin films) that result from dewetting processes. Spontaneous dewetting was used to generate self-organizing PFPE bead patterns by microcontact printing. The wetting transitions in this latter case occur directly on the printing tool and, via the bias provide by the topography of the stamp, provide a means for generating and transferringcomplex organizations of adsorbate domains to the substrate. The combination of contact printing with spontaneous dewetting of the PFPE enabled us toproduce high-fidelity patterns of discrete, micron-scale beads from printing tools with continuous line shapes without any alteration to the originalmask pattern. The patterned beads typically had radii and characteristic separation lengths on the micron-scale, and heights on the nanoscale. Thesislength scales appear to be governed by the combined influences of solvent-mediated nucleation processes and coarsening. Characterization was performed by optical microscopy, atomic force microscopy (AFM), secondary ion mass spectrometry (SIMS), and X-ray photoelectron spectroscopy (XPS). These datasuggest general design strategies that can be exploited to control the contours and structural profiles that result from the dewetting of the PFPE ink on a stamp used for contact printing.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 07:13:48