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Volumn 22, Issue 26, 2006, Pages 11255-11266

Surfaces of fluorinated pyridinium block copolymers with enhanced antibacterial activity

Author keywords

[No Author keywords available]

Indexed keywords

ANTIBACTERIAL ACTIVITY; CONTACT ANGLE MEASUREMENTS; FLUORINATED PYRIDINIUM SURFACES; NEAR EDGE X RAY ABSORPTION FINE STRUCTURE SPECTROSCOPY;

EID: 33846382692     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la061384v     Document Type: Article
Times cited : (121)

References (65)
  • 47
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    • Stöhr J. NEXAFS Spectroscopy; Springer-Verlag: New York, 1996; Chapter 5, p 114.
    • (1996) NEXAFS Spectroscopy , pp. 114
    • Stöhr, J.1
  • 51
    • 33846361624 scopus 로고    scopus 로고
    • 2 (ref 52).
    • 2 (ref 52).
  • 53
    • 0000176830 scopus 로고
    • Fluropolymers
    • Wall, L. A, Ed, Wiley-Interscience: New York
    • Pittman, A. G. In Fluropolymers; High Polymers Series XXV; Wall, L. A., Ed.; Wiley-Interscience: New York, 1972; p 419-449.
    • (1972) High Polymers Series , vol.25 , pp. 419-449
    • Pittman, A.G.1
  • 54
    • 33846344184 scopus 로고    scopus 로고
    • The edge jump is given by the difference of the electron yield about 30 eV above the ionization threshold (320 eV in C 1s NEXAFS spectra and 430 eV in N 1s spectra) and the electron yield just below the first resonance (cf. ref 55). As discussed in Section 2.5, the latter is ∼0 for both C 1s and N 1s spectra. and the C 1s edge jump has been set to unity.
    • The edge jump is given by the difference of the electron yield about 30 eV above the ionization threshold (320 eV in C 1s NEXAFS spectra and 430 eV in N 1s spectra) and the electron yield just below the first resonance (cf. ref 55). As discussed in Section 2.5, the latter is ∼0 for both C 1s and N 1s spectra. and the C 1s edge jump has been set to unity.
  • 55
    • 0004237782 scopus 로고    scopus 로고
    • Springer-Verlag: New York, Chapter 7, p
    • Stöhr J. NEXAFS Spectroscopy; Springer-Verlag: New York, 1996; Chapter 7, p 211.
    • (1996) NEXAFS Spectroscopy , pp. 211
    • Stöhr, J.1
  • 59
    • 33846344874 scopus 로고    scopus 로고
    • The degree of quaternization estimated using this procedure will differ from that obtained by more conventional methods (such as IR or elemental analysis) if the low-surface-energy alkyl groups in the quaternized polymer form a thin layer at the surface covering the higher-surface-energy pyridinium rings. The maximum thickness of this layer can be estimated to be ∼7.7 Å, corresponding to a fully stretched n-hexyl chain attached to the pyridinium nitrogen. In such a case, the degree of quaternization obtained from the NEXAFS spectra will be a slight overestimate
    • The degree of quaternization estimated using this procedure will differ from that obtained by more conventional methods (such as IR or elemental analysis) if the low-surface-energy alkyl groups in the quaternized polymer form a thin layer at the surface covering the higher-surface-energy pyridinium rings. The maximum thickness of this layer can be estimated to be ∼7.7 Å, corresponding to a fully stretched n-hexyl chain attached to the pyridinium nitrogen. In such a case, the degree of quaternization obtained from the NEXAFS spectra will be a slight overestimate.
  • 60
    • 33846349773 scopus 로고    scopus 로고
    • To displace the PS block from the surface, the decrease in P4VP block surface energy contributed by the perfluorooctyl groups must compensate for the increased energy of the exposed P4VP surface. This compensation will require a high areal density of perfluorooctyl groups, resulting in the necessity of the P4VP chains to stretch away from the surface. The free energy penalty for the required P4VP stretching increases as the P4VP block length increases and, thus, above some block length, the perfluorooctyl end group will be ineffective in bringing the P4VP block to the surface.
    • To displace the PS block from the surface, the decrease in P4VP block surface energy contributed by the perfluorooctyl groups must compensate for the increased energy of the exposed P4VP surface. This compensation will require a high areal density of perfluorooctyl groups, resulting in the necessity of the P4VP chains to stretch away from the surface. The free energy penalty for the required P4VP stretching increases as the P4VP block length increases and, thus, above some block length, the perfluorooctyl end group will be ineffective in bringing the P4VP block to the surface.
  • 62
    • 33846347843 scopus 로고    scopus 로고
    • 66kH6Br surfaces prepared by the spin-coating (Figure 6) and the spray-coating (Figure 7) techniques are attributed to the different processing conditions used for the two surfaces. The spin-coated samples were annealed at 150°C, which is above the glass transition temperature of the PS block, while the spray-coated samples were dried at 60°C.
    • 66kH6Br surfaces prepared by the spin-coating (Figure 6) and the spray-coating (Figure 7) techniques are attributed to the different processing conditions used for the two surfaces. The spin-coated samples were annealed at 150°C, which is above the glass transition temperature of the PS block, while the spray-coated samples were dried at 60°C.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.