Polystyrene (PS) honeycomb patterned porous films filled with titanium dioxide (TiO2) nanoparticles were prepared by a modified breath figure method. The honeycomb patterned porous films filled with ...TiO2 nanoparticles were obtained by pouring titanium butoxide over partially dried PS solution during the fabrication of the PS films under humid conditions. TiO2 nanoparticles were obtained by the hydrolysis of titanium butoxide in the condensed micro water droplets at the PS solution/air interface. Morphology, elemental mapping, X-ray diffraction (XRD), X-ray photoelectron spectroscopy, and UV−Visible analysis support the formation of TiO2 nanoparticles in the honeycomb patterned pores. XRD studies showed that the formed TiO2 nanoparticles are anatase. Photo-activity of the incorporated TiO2 nanoparticles was examined by the change of the water contact angle of the films before and after UV irradiation. Water contact angles was decreased by UV irradiation, implying the transformation of the surface from hydrophobic to hydrophilic due to the photo-induced wettability by TiO2.
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•The honeycomb patterned films with TiO2 nanoparticles filled pores were prepared.•The films were prepared by pouring titanium butoxide over partially dried PS solution.•We firstly report in-situ pore-filling during the fabrication of HCP porous films.•Photo-activity of the incorporated TiO2 nanoparticles was examined by wettability.
We present a new and facile strategy for the fabrication of conducting honeycomb-patterned porous films through interfacial polymerization. Polymer solutions containing poly(ε-carprolactone) (PCL) ...and benzoyl peroxide (BPO) in chloroform was fabricated under high humid conditions to obtain PCL-BPO honeycomb patterned films. The films were treated with aqueous aniline hydrochloride solution to polymerize aniline at the interface of the PCL film and aniline hydrochloride solution. PCL-BPO films served dual role of a template as well as an oxidant. The proposed strategy retains the electrical conductivity of polyaniline as well as the mechanical strength and biodegradable properties of PCL. In contrast with in-situ templated bulk polymerization methods, the proposed method exhibits the advantage of retaining porosity without causing any wreckage.
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•Fabrication of conducting honeycomb-patterned films through interfacial polymerization.•Poly(ε-carprolactone) containing benzoyl peroxide was fabricated to obtain PCL-BPO honeycomb-patterned films.•PCL-BPO films are serving dual role of template as well as an oxidant.•The films were treated with aqueous aniline solution to polymerize at the interface.
Guar gum (GG) composite films, incorporating the ethanolic extract of propolis (EEP), were prepared and subjected to a comprehensive investigation of their functional characteristics. The addition of ...EEP resulted in a discernible enhancement in the opacity, moisture barrier capacity, and elongation at break. Incorporating EEP led to a noteworthy increase in the total phenolic and total flavonoid content of the films, resulting in superior antioxidant capacity upon GG-EEP films. Remarkably, the addition of 5 % EEP yielded noteworthy outcomes, manifesting in a DPPH radical scavenging rate of 47.60 % and the ABTS radical scavenging rate of 94.87 %, as well as FRAP and cupric reducing power of 331.98 mmol FeSO4-7H2O kg−1 and 56.95 μg TE mg−1, respectively. In addition, GG-EEP films demonstrated antifungal effect against Penicillium expansum and Aspergillus niger, along with a sustained antibacterial effect against Escherichia coli and Staphylococcus aureus. GG-EEP films had superior inhibitory ability against Gram-positive bacteria than Gram-negative bacteria. Crucially, GG-EEP composite films played a pivotal role in reducing both lesion diameter and depth, concurrently mitigating weight loss and firmness decline during the storage period of “Nanguo” pears. Therefore, GG-EEP composite films have the considerable potential to serve as advanced and effective active packaging materials for food preservation.
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•Guar gum-ethanolic extract of propolis (GG-EEP) composite films were prepared.•EEP improved the film's barrier properties to visible light and water vapor.•GG-EEP films showed superior antioxidant and anti-Gram-positive bacteria activity.•GG-EEP coating reduced the weight loss and lesion diameter of “Nanguo” pears.•GG-EEP films had the potential as active packaging materials for food preservation.
Developing Functionalized Surfaces WATANABE, Shuichi
Journal of The Surface Finishing Society of Japan,
2023/02/01, Letnik:
74, Številka:
2
Journal Article
•A microfiber sensor coated PDA/4-MPY film for detecting trace Hg2+ concentration.•The functional film is succeed by one step dip-coating for specific recognition of Hg2+.•The Hg2+ captured by the ...fiber surface functional film causes the wavelength shift.•The response of this sensor to Hg2+ of 0–100 nM, with the sensitivity of 1.015 nm/nM.
The monitoring of heavy metal ions content has positive significance for water resources quality monitoring and environmental protection. Herein, a tapered microfiber sensor functionalized polydopamine/4-mercaptopyridine (PDA/4-MPY) film for detection of trace mercury ion (Hg2+) concentration in water is proposed and demonstrated. The microfiber interferometer has excellent sensing performance including a refractive index (RI) sensitivity response of 1146 nm/RIU and a low-cross temperature response of −0.03 nm/℃. Hg2+ heavy metal ion is captured by the surface functional film to affect the RI of the microfiber surface, which lead to the wavelength shift of the interference spectrum. Experiments demonstrate that the sensor has an obvious regular response to Hg2+ in the range of 0–100 nM, in which the sensitivity reaches 1.015 nm/nM in the range of 0–10 nM with a high reliability (R2 = 0.99). This sensor has high sensitivity response and strong specific recognition to trace Hg2+ concentration under the advantages of simple fabrication and low cost. Furthermore, the success of the proposed sensor also indicates that the combination of microfiber and nanomaterial has a bright prospect in the field of optical detection.
•A novel polyimide/functionalized graphene composite matrix with double bond (GPI/AMG) was synthesized.•Cross-linked nanocomposite films based on GPI/AMG were prepared by using UV-curing ...technology.•The interaction between AMG and GPI matrix and the cross-linked structure improved the performance of the UV-cured films.
Polyimide/amino-modified reduced graphene oxide (PI/AMG) composite matrix were synthesized through the condensation reaction of 4,4'-diaminodiphenyl ether, 3,5-diaminobenzoic acid, diphthalic anhydride, and AMG. Subsequently, the double bonds were incorporated into the matrix through the reaction of glycidyl methacrylate (epoxide group) and the carboxyl group on PI/AMG. UV-cured composite films were then prepared and performance was evaluated. The results revealed that the tensile strength and elongation at break could reach a maximum of 108.7 MPa and 46.4%, which represented increases of 102.8% and 354.9%, respectively, compared with the GPI/AMG0% film. The water absorption decreased from 0.64% to 0.27%. And their surface resistivity reached 106–109 Ω, an increase of approximately eight orders of magnitude.
