Reversible Conversion of Conducting Polymer Films from Superhydrophobic to Superhydrophilic

Xu, Lianbin; Chen, Wilfred; Mulchandani, Ashok; Yan, Yuying

doi:10.1002/anie.200500868

Cited by 387 publications

(287 citation statements)

References 36 publications

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“…Under certain conditions, these interfaces exhibit unexpected properties, providing a huge potential to be explored theoretically and many potential novel applications. Hydrophilicity and hydrophobicity are the two opposite extremes in wettability of a surface and artificial switches between hydrophilic and hydrophobic or even superhydrophilic and superhydrophobic that can be triggered by external stimuli, such as temperature, pH, light, etc., [62][63][64][65][66] are excellent examples of BSMI materials.…”

Section: Binary Cooperative Complementary Interfacesmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

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In this review a strategy for the design of bioinspired, smart, multiscale interfacial (BSMI) materials is presented and put into context with recent progress in the field of BSMI materials spanning natural to artificial to reversibly stimuli‐sensitive interfaces. BSMI materials that respond to single/dual/multiple external stimuli, e.g., light, pH, electrical fields, and so on, can switch reversibly between two entirely opposite properties. This article utilizes hydrophobicity and hydrophilicity as an example to demonstrate the feasibility of the design strategy, which may also be extended to other properties, for example, conductor/insulator, p‐type/n‐type semiconductor, or ferromagnetism/anti‐ferromagnetism, for the design of other BSMI materials in the future.

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Section: Binary Cooperative Complementary Interfacesmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

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“…15 min by adding FeCl 3 ·6 H 2 O to the pyrrole-TEAPFOS-ACN solution that was expected to facilitate the electropolymerization and promote the formation of a rougher and more hydrophobic PPy film surface. 52 The electropolymerization was then carried out galvanostatically for 15 min at 0.25 mA cm -2 (controlled by the Autolab PGSTAT 12 or PGSTAT 30 potentiostats) in a three-electrode one-compartment cell on GC electrodes (d=1.6 mm). After the polymerization, the formed PPy films were characterized by cyclic voltammetry (CV) in monomer-and chloride-free 0.05 M TEAPFOS-ACN electrolyte solution in the three-electrode cell described above and then pre-polarized at 0.18 V in this solution for 10 min before rinsing the films with ACN.…”

Section: Chemicalsmentioning

confidence: 99%

“…Thus in contrary to most ECPs, such films are in fact more hydrophobic in the oxidized state than in the reduced state. 52 To ensure the maximum hydrophobicity and stability of the PPy-PFOS solid-contact, we have pre-polarized the SC 53 before covering it with the ISM to adjust the PPy-PFOS film to its stable oxidized and hydrophobic form. By this procedure we expected to improve also the reproducibility of the standard potential (E 0 ), as the large deviation of E 0 is a common problem of SCISEs.…”

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confidence: 99%

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Pre-Polarized Hydrophobic Conducting Polymer Solid-Contact Ion-Selective Electrodes with Improved Potential Reproducibility

Papp

Lindfors

et al. 2017

Anal. Chem.

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Electrically conducting polymers (ECPs) are one of the most popular types of materials to interface ion-selective membranes (ISMs) with electron conducting substrates to construct solid contact ion-selective electrodes (SCISEs). For optimal ion-to-electron transduction and potential stability, the p-doped ECPs with low oxidation potentials such as PPy need to be generally in their conducting form along with providing a sufficiently hydrophobic interface to counteract the aqueous layer formation. The first criterion requires that the ECPs are in their oxidized state, but the high charge density of this state is detrimental for the prevention of the aqueous layer formation. We offer here a solution to this paradox by implementing a highly hydrophobic perfluorinated anion (perfluorooctane sulfonate, PFOS -) as doping ion by 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 which the oxidized form of the ECP becomes hydrophobic. The proof of concept is shown by using polypyrrole (PPy) films doped with PFOS -(PPy-PFOS) as the solid contact in K + -selective SCISEs (K + -SCISE). Prior to applying the plasticized poly(vinyl chloride) ISM, the oxidation state of the electrodeposited PPy-PFOS was adjusted by polarization to the known open circuit potential of the solid contact in 0.1 M KCl. We show that the pre-polarization results in a hydrophobic PPy-PFOS film with a water contact angle of 97±5º, which effectively prevents the aqueous layer formation under the ISM. Under optimal conditions the K + -SCISEs had a very low standard deviation of E 0 of only 501.0±0.7 mV that is the best E 0 reproducibility reported for ECP-based SCISEs.

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“…Surface properties of these very well studied polymers can be effectively controlled and reproduced by controlling the polymerisation conditions as well as by using appropriate counter ions. The use of various types of dopants in combination with different polymerisation conditions influences polymer surface properties like thickness, roughness, conductivity and hydrophobicity [20][21][22] and has been shown to influence cell viability [18].…”

Section: Introductionmentioning

confidence: 99%

Tunable conjugated polymers for bacterial differentiation

Golabi

Turner

Jager

2016

Sensors and Actuators B: Chemical

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A novel rapid method for bacterial differentiation is explored based on the specific adhesion pattern of bacterial strains to tunable polymer surfaces. Different types of counter ions were used to electrochemically fabricate dissimilar polypyrrole (PPy) films with diverse physicochemical properties such as hydrophobicity, thickness and roughness. These were then modulated into three different oxidation states in each case. The dissimilar sets of conducting polymers were Principal Component Analysis showed that each strain of bacteria had its own specific adhesion pattern. Hence, they could be discriminated by this simple, label-free method. , based on tunable polymer arrays combined with pattern recognition.

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Reversible Conversion of Conducting Polymer Films from Superhydrophobic to Superhydrophilic

Cited by 387 publications

References 36 publications

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Pre-Polarized Hydrophobic Conducting Polymer Solid-Contact Ion-Selective Electrodes with Improved Potential Reproducibility

Tunable conjugated polymers for bacterial differentiation

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