Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films

M Raposo, RS Pontes, LHC Mattoso, ON Oliveira

Research output: Contribution to journalArticle

138 Citations (Scopus)

Abstract

The kinetics of adsorption of poly(o-methoxyaniline) (POMA) via self-assembly has been investigated using UV-vis spectroscopy. Though experimental conditions, including type of substrate, affect the amount of polymer adsorbed, adsorption of the first POMA layer on glass substrates was shown to occur in two stages, reaching saturation within a few minutes. The first stage is represented by a first-order kinetics with characteristic times of 5-10 s. The second stage also has an exponential behavior with t(1.5) and characteristic times of hundreds of seconds, which was valid for all substrates when the shift in the polaronic band in the beginning of adsorption was taken into account. The t(1.5) within the exponential is believed to indicate a diffusion-controlled growth of small domains formed during the first stage of adsorption. The appearance of small domains and their subsequent growth are consistent with scanning electron micrographs obtained at distinct time periods of adsorption. When a POMA layer was made to adsorb on an already formed POMA/poly(ethenesulfonic acid) self-assembly multilayer, the adsorption process became faster as the number of bilayers already deposited increased.

Original languageEnglish
Pages (from-to)6095-6101
Number of pages7
JournalMacromolecules
Volume30
Issue number20
Publication statusPublished - 6 Oct 1997

Keywords

  • Plyaniline
  • Polymers
  • Conjugated polyuons

Cite this

Raposo, M., Pontes, RS., Mattoso, LHC., & Oliveira, ON. (1997). Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films. Macromolecules, 30(20), 6095-6101.
Raposo, M ; Pontes, RS ; Mattoso, LHC ; Oliveira, ON. / Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films. In: Macromolecules. 1997 ; Vol. 30, No. 20. pp. 6095-6101.
@article{4ec32d0adfb042beaa074b198b012718,
title = "Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films",
abstract = "The kinetics of adsorption of poly(o-methoxyaniline) (POMA) via self-assembly has been investigated using UV-vis spectroscopy. Though experimental conditions, including type of substrate, affect the amount of polymer adsorbed, adsorption of the first POMA layer on glass substrates was shown to occur in two stages, reaching saturation within a few minutes. The first stage is represented by a first-order kinetics with characteristic times of 5-10 s. The second stage also has an exponential behavior with t(1.5) and characteristic times of hundreds of seconds, which was valid for all substrates when the shift in the polaronic band in the beginning of adsorption was taken into account. The t(1.5) within the exponential is believed to indicate a diffusion-controlled growth of small domains formed during the first stage of adsorption. The appearance of small domains and their subsequent growth are consistent with scanning electron micrographs obtained at distinct time periods of adsorption. When a POMA layer was made to adsorb on an already formed POMA/poly(ethenesulfonic acid) self-assembly multilayer, the adsorption process became faster as the number of bilayers already deposited increased.",
keywords = "Plyaniline, Polymers, Conjugated polyuons",
author = "M Raposo and RS Pontes and LHC Mattoso and ON Oliveira",
year = "1997",
month = "10",
day = "6",
language = "English",
volume = "30",
pages = "6095--6101",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "AMER CHEMICAL SOC",
number = "20",

}

Raposo, M, Pontes, RS, Mattoso, LHC & Oliveira, ON 1997, 'Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films', Macromolecules, vol. 30, no. 20, pp. 6095-6101.

Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films. / Raposo, M; Pontes, RS; Mattoso, LHC; Oliveira, ON.

In: Macromolecules, Vol. 30, No. 20, 06.10.1997, p. 6095-6101.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films

AU - Raposo, M

AU - Pontes, RS

AU - Mattoso, LHC

AU - Oliveira, ON

PY - 1997/10/6

Y1 - 1997/10/6

N2 - The kinetics of adsorption of poly(o-methoxyaniline) (POMA) via self-assembly has been investigated using UV-vis spectroscopy. Though experimental conditions, including type of substrate, affect the amount of polymer adsorbed, adsorption of the first POMA layer on glass substrates was shown to occur in two stages, reaching saturation within a few minutes. The first stage is represented by a first-order kinetics with characteristic times of 5-10 s. The second stage also has an exponential behavior with t(1.5) and characteristic times of hundreds of seconds, which was valid for all substrates when the shift in the polaronic band in the beginning of adsorption was taken into account. The t(1.5) within the exponential is believed to indicate a diffusion-controlled growth of small domains formed during the first stage of adsorption. The appearance of small domains and their subsequent growth are consistent with scanning electron micrographs obtained at distinct time periods of adsorption. When a POMA layer was made to adsorb on an already formed POMA/poly(ethenesulfonic acid) self-assembly multilayer, the adsorption process became faster as the number of bilayers already deposited increased.

AB - The kinetics of adsorption of poly(o-methoxyaniline) (POMA) via self-assembly has been investigated using UV-vis spectroscopy. Though experimental conditions, including type of substrate, affect the amount of polymer adsorbed, adsorption of the first POMA layer on glass substrates was shown to occur in two stages, reaching saturation within a few minutes. The first stage is represented by a first-order kinetics with characteristic times of 5-10 s. The second stage also has an exponential behavior with t(1.5) and characteristic times of hundreds of seconds, which was valid for all substrates when the shift in the polaronic band in the beginning of adsorption was taken into account. The t(1.5) within the exponential is believed to indicate a diffusion-controlled growth of small domains formed during the first stage of adsorption. The appearance of small domains and their subsequent growth are consistent with scanning electron micrographs obtained at distinct time periods of adsorption. When a POMA layer was made to adsorb on an already formed POMA/poly(ethenesulfonic acid) self-assembly multilayer, the adsorption process became faster as the number of bilayers already deposited increased.

KW - Plyaniline

KW - Polymers

KW - Conjugated polyuons

UR - http://www.scopus.com/record/display.uri?eid=2-s2.0-0031556479&origin=inward&txGid=52953a902768e75cdebe48e71c47332c

M3 - Article

VL - 30

SP - 6095

EP - 6101

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 20

ER -

Raposo M, Pontes RS, Mattoso LHC, Oliveira ON. Kinetics of adsorption of poly(o-methoxyaniline) self-assembled films. Macromolecules. 1997 Oct 6;30(20):6095-6101.