Polyaniline decorated honeycomb-patterned pores: Use of a reactive vapor in breath figure method

Male, Umashankar; Shin, Bo Kyoung; Huh, Do Sung

doi:10.1016/j.polymer.2017.06.021

Cited by 20 publications

(12 citation statements)

References 24 publications

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“…The f-PANI, HCP-PANI, and HCP-SPANI films were dissolved in NMP. The spectra of f-PANI and HCP-PANI presented broad bands with the maximum at 510 nm, which represents π–π* electronic transitions related to the benzenoid form of PANI and polaron→π* electronic transitions related to the quinoid rings of PANI, respectively [ 35 , 36 ]. The absorption spectra of HCP-SPANI showed peaks around 500–600 nm for sulfonated PANI assigned to π→polaron electronic transitions [ 50 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, the application of PANI becomes restricted due to its low processability and insolubility in the most common solvents. To overcome this limitation, a modified breath figure (BF) method combined with interfacial polymerization to functionalize PANI on a micro-structured film surface was reported [ 35 , 36 ]. The BF method is a simple and convenient method to fabricate highly ordered honeycomb-patterned (HCP) porous films with specific surface topography and chemical distribution, first reported by Widawski et al [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

2022

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We have fabricated poly(ε-caprolactone) (PCL) films with flat and honeycomb-patterned (HCP) structures to coat polyaniline (PANI) on the film surface. In addition, the effect of chemical modification of PANI by sulfuric acid (H2SO4) was also studied for antibacterial activity. The flat and HCP PCL films were obtained by simple evaporation of the solvent and via the breath figure (BF) method, respectively. The morphology and chemical composition of PANI coated on the film surface were evaluated by scanning electron microscopy (SEM) and X-ray spectroscopy (EDX). Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analyses (TGA) were obtained to identify the PANI coating. The wettability and conductivity of the films were also measured. Applicational aspects were evaluated by assessing antibacterial and antibiofilm activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The EDX, TGA, and FT-IR findings indicated chemical modification of PCL film by PANI and H2SO4. The conductivity of the films was increased by the coating of PANI to the patterned surface and additionally increased by the chemically modified PANI. The antibacterial activity was 69.79%, 78.27%, and 88% against E. coli, and 32.73%, 62.65%, and 87.97% against S. aureus, for flat PANI, HCP PANI, and H2SO4-treated HCP films, respectively. Likewise, the PANI coated flat, HCP, and H2SO4-treated HCP films inhibited E. coli biofilm formation by around 41.62%, 63%, and 83.88% and S. aureus biofilm formation by 17.81%, 69.83%, and 96.57%, respectively. The antibacterial activity of the HCP film was higher than that of flat PANI films, probably due to the higher coating of PANI on the HCP surface. Moreover, sulfonation of the HCP film with H2SO4 might have improved the wettability, thereby enhancing the antibacterial and antibiofilm properties. Our results showed that topographical changes, as well as doping, offer simple and cost-effective ways to modify the structural and functional properties of films.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

2022

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“…The possible mechanism involving the self‐assembly of hydrophilic aldehyde group in the PS and PS‐CHO polymer solution is shown in Figure . As the evaporation of volatile chloroform starts from the surface of the polymer solution, the moisture starts condensing due to the drop in temperature to the dew point . Water droplets start settling on the surface of the polymer and grow in size.…”

Section: Resultsmentioning

confidence: 99%

Formylated polystyrene for the fabrication of pore selective aldehyde group functionalized honeycomb patterned porous polystyrene films

Modigunta

Male

Huh

2018

J Polym Sci B Polym Phys

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Formylated polystyrene (PS-CHO) was synthesized by chemical modification of polystyrene (PS) for the fabrication of honeycomb patterned (HCP) porous PS films with aldehyde group functionalized pores via breath figure method under humid conditions. The incorporation of hydrophilic aldehyde group affected the hydrophobicity of PS solution and assisted the self-assembly of PS-CHO toward pore. The presence of aldehyde groups in the films were proved by the post treatment with Tollens's reagent, which results in silver decoration at pores. The morphology of the films before and after silver decoration was studied by scanning electron microscopy analysis. The pore selectively self-assembled aldehyde groups in the patterned porous films can have many applications as a reactive substrate in biomaterials and chemical moieties adhesion.

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“…In the bottom-up process of the BF mechanism, the stage at which there is an interfacial interaction of water droplet and polymer solution can be applied for the site-selective functionalization. Applying this phenomenon, Huh et al recently introduced a modified BF method, called the reactive BF (rBF) method, for the single-step fabrication of pore-selective functionalized films by accompanying an interfacial chemical reaction during the BF process [ 98 , 109 , 110 , 111 , 112 , 113 ]. For this method, a solvent-soluble reactant is added to the hydrophobic polymer solution, and a water-soluble counter reactant is added to the water used for humid conditions.…”

Section: Pore-selective Functionalization Of Hcp Filmsmentioning

confidence: 99%

Modified Breath Figure Methods for the Pore-Selective Functionalization of Honeycomb-Patterned Porous Polymer Films

2022

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Recent developments in the field of the breath figure (BF) method have led to renewed interest from researchers in the pore-selective functionalization of honeycomb-patterned (HCP) films. The pore-selective functionalization of the HCP film gives unique properties to the film which can be used for specific applications such as protein recognition, catalysis, selective cell culturing, and drug delivery. There are several comprehensive reviews available for the pore-selective functionalization by the self-assembly process. However, considerable progress in preparation technologies and incorporation of new materials inside the pore surface for exact applications have emerged, thus warranting a review. In this review, we have focused on the pore-selective functionalization of the HCP films by the modified BF method, in which the self-assembly process is accompanied by an interfacial reaction. We review the importance of pore-selective functionalization, its applications, present limitations, and future perspectives.

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Polyaniline decorated honeycomb-patterned pores: Use of a reactive vapor in breath figure method

Cited by 20 publications

References 24 publications

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

Formylated polystyrene for the fabrication of pore selective aldehyde group functionalized honeycomb patterned porous polystyrene films

Modified Breath Figure Methods for the Pore-Selective Functionalization of Honeycomb-Patterned Porous Polymer Films

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