In situ surface selective functionalization of honeycomb patterned porous poly(ε-caprolactone) films using reactive substrate

Thi, Phan Ngoc Uyen; Male, Umashankar; Huh, Do Sung

doi:10.1016/j.polymer.2018.06.002

Cited by 4 publications

(5 citation statements)

References 30 publications

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“…In the final degradation step, around 11.8% of weight loss was observed between 442.85 °C and 724.74 °C. The degradation of f-PANI between 150 to 400 °C was similar to the PCL degradation curve [ 55 ]. This might be due to the lower functionalization of PANI on the flat film; therefore, a characteristic PCL curve was obtained in that range.…”

Section: Resultsmentioning

confidence: 81%

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: 81%

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

2022

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“…In addition to the total surface functionalization of HCP film, recent developments in the field of the BF method have led to a renewed interest of researchers in the site-selective functionalization of HCP films at the top surfaces [ 82 ], bottom surfaces [ 83 , 84 , 85 ], or pore surfaces [ 86 , 87 ], as shown in Figure 2 . The site-selective functionalization gives unique properties to the film which can be used for specific applications.…”

Section: Introductionmentioning

confidence: 99%

“…The site-selective functionalization gives unique properties to the film which can be used for specific applications. The film develops a heterogenous surface by selectively functionalizing the top or the bottom surface only [ 82 , 83 , 84 , 85 ]. These heterogeneously functionalized films may have potential applications in the fields of bio-inspired artificial ion channels, directional drug delivery, biosensors, and molecular filtration [ 82 , 83 , 84 , 85 ].…”

Section: Introductionmentioning

confidence: 99%

“…The film develops a heterogenous surface by selectively functionalizing the top or the bottom surface only [ 82 , 83 , 84 , 85 ]. These heterogeneously functionalized films may have potential applications in the fields of bio-inspired artificial ion channels, directional drug delivery, biosensors, and molecular filtration [ 82 , 83 , 84 , 85 ]. For example, Guo et al developed a unidirectional surface, where water could penetrate from the hydrophobic PI side to the hydrophilic anodic aluminum oxide side, but not from the hydrophilic to the hydrophobic side [ 85 ].…”

Section: Introductionmentioning

confidence: 99%

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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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“…They found that the metal-complexation-induced phase separation approach allowed the formation of a well-defined honeycomb film. Similarly, Do prepared asymmetrically functionalized poly (ε-caprolactone)/polypyrrole/silver honeycomb films by casting a polymer solution on a reactive ice substrate (containing AgNO 3 ) [34]. Those studies have clearly demonstrated that metal salt has significant effects on the morphology of honeycomb films.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Pore-Selective Metal-Nanoparticle-Functionalized Honeycomb Films via the Breath Figure Accompanied by In Situ Reduction

et al. 2021

Polymers

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Honeycomb films pore-filled with metal (Au, Ag, and Cu) nanoparticles were successfully prepared by combining the breath figure method and an in situ reduction reaction. First, a polyhedral oligomeric silsesquioxane (POSS)-based star-shaped polymer solution containing metal salt was cast under humid conditions for the formation of honeycomb films pore-filled with metal salt through the breath figure method. The morphology of the honeycomb films was mainly affected by the polymer molecular structure and the metal salt. Interestingly, the promoting effect of the metal salt in the breath figure process was also observed. Then, honeycomb films pore-filled with metal nanoparticles were obtained by in situ reduction of the honeycomb films pore-filled with metal salt using NaBH4. Notably, the metal nanoparticles can be selectively functionalized in the pores or on the surface of the honeycomb films by controlling the concentration of the NaBH4. Metal-nanoparticle-functionalized honeycomb films can prospectively be used in catalysis, flexible electrodes, surface-enhanced Raman spectroscopy (SERS), and wettability patterned surfaces.

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In situ surface selective functionalization of honeycomb patterned porous poly(ε-caprolactone) films using reactive substrate

Cited by 4 publications

References 30 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

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

Fabrication of Pore-Selective Metal-Nanoparticle-Functionalized Honeycomb Films via the Breath Figure Accompanied by In Situ Reduction

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