Hydrogen peroxide treated graphene as an effective nanosheet filler for separation application

Synthesized nanocomposite of protonated polyaniline with camphorsulfonic acid (PANI-CSA) hosted in poly(methyl methacrylate) (PMMA) and incorporated with nickel nanoparticles (NiNPs) were coated as thin films on activated fused silica substrates using oxygen-plasma and spin coating techniques. Weight percent ratios of 0, 10, 20, 30, 60, and 90% of NiNPs with respect to PANI-CSA thin films have been studied in order to investigate the optical, structural, and morphological properties of (PANI-CSA-PMMA)/ NiNPs by employing UV-Vis spectrometer, XRD, scanning electron microscopy (SEM), contact angle (CA) goniometry, impedance analyzer, and thermogravimetric analysis. Deduced refractive indices (n) from UV-Vis data were in the range from 1.5 up to 2.2. SEM micrographs show the typical crystalline structure of PANI was vanishing gradually with increasing the NiNPs content. Optical properties such as refractive index (n), extinction coefficient (k), absorption coefficient (α) as well as the band-gap energies (E g ) were mathematically deduced throughout the experimental transmittance and absorbance UV-Vis spectra. Calculated refractive indices (n) were in the range from 1.5 up to 2.2. Optical band-gap energies decrease in a monoexponential decay for samples up to 60% NiNPs/PANI-CSA, samples with 90% concentration had substantial drop in its value due to the NiNPs percolations. The incorporation with NiNPs leads to the development of a new morphological states (sheet-like heterostructure) which start to be obvious at 30%, at this concentration the CA was maxima (54 ), at this concentration and the crystallite size are maximum and the CA was maximum (highest hydrophobicity).

Section: Surface Analysis Studiesmentioning

confidence: 99%

Optical and structural properties of (PANI‐CSA‐PMMA)/NiNPs nanocomposites thin films for organic optical filters

Jum’h

Mousa

Mhawish

et al. 2019

“…Water contact angles were measured to investigate the surface wettability of the PVDF film before and after modification . As shown in Figure , the contact angle of the pure PVDF film was 100°.…”

Section: Resultsmentioning

confidence: 99%

“…Water contact angles were measured to investigate the surface wettability of the PVDF film before and after modification. [46][47][48] As shown in Figure 9, the contact angle of the pure PVDF film was 100 . After the film was treated with the alkaline solution, the angle decreased to 66 , indicating the hydrophilic property.…”

Section: Surface Hydrophilicity Studymentioning

confidence: 88%

Synthesis of carbon quantum dots to fabricate ultraviolet‐shielding poly(vinylidene fluoride) films

Dong

Xiong

Liu

et al. 2019

The paper presents a simple and effective approach to fabricating a poly(vinylidene fluoride) (PVDF) film with excellent ultraviolet (UV) shielding performance. Carbon quantum dots (CQDs) with a highly UV absorbing property were made via a hydrothermal reaction and were then added to a poly(vinyl alcohol) (PVA) solution. The PVDF membrane pretreated with an alkaline solution was immersed in the prepared CQD/PVA solution to coat a UV‐shielding layer on the film surface. Fourier transform infrared spectroscopy, X‐ray photoelectron spectrometry, X‐ray diffraction, transmission electron microscopy, and UV–visible spectrophotometry were applied to study the structure, morphology, and optical performance of the CQD particles. The stability and UV‐shielding performance of the obtained PVDF‐OH@CQDs/PVA composite film were further investigated. The results showed that the CQD particles with diameter of 18 nm could be well dispersed in solution. Additionally, the CQDs had fairly high UV absorbance, and the PVDF‐OH@CQDs/PVA composite film could shield the UV light completely. The method described in this paper is a promising one for fabricating UV‐shielding composite films. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47555.

“…The water contact angle is typically used for estimating the relative hydrophilicity of composites . The effect of hANFs content on the hydrophilicity of XNBR/hANFs nanocomposites is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Tailoring the structure of Kevlar nanofiber and its effects on the mechanical property and thermal stability of carboxylated acrylonitrile butadiene rubber

Xue

Kuan

Yin

et al. 2019

Water‐dispersible hydrolyzed Kevlar nanofibers (hANFs) prepared by acid‐assisted hydrothermal treatments of Kevlar nanofibers (ANFs) were first incorporated into carboxylated acrylonitrile butadiene rubber (XNBR) by a latex co‐coagulation method. The obtained hANFs maintained the one‐dimensional nanofibrous morphology and crystal structure as ANFs. There were amounts of polar groups appearing at the end of hANFs molecular chains after hydrothermal process, which led to the strong hydrogen bonding interaction between the filler and XNBR matrix. The results indicated that hANFs had significant reinforcement effects on the mechanical properties, crosslink density, and thermal stability of XNBR matrix. In comparison with those of neat XNBR, the tensile strength, tear strength, crosslink density, and maximum heat decomposition temperature (Tmax) of XNBR/hANFs nanocomposites filled with 7 phr hANFs increased by 236%, 161%, 35%, and 19.64 °C, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47698.