Graphene oxide and silane-modified graphene oxide/unsaturated polyester resin nanocomposites: A comparative cure kinetic and diffusion study

Yavari, Neda; Poorabdollah, Mehdi; Rajabi, Laleh

doi:10.1016/j.tca.2021.179081

Cited by 22 publications

(22 citation statements)

References 33 publications

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“…The broad peak at around 3100 cm −1 was attributed to the OH stretching vibration of the COH groups and the water content in the material 44 . The structural modification and oxidation of graphite have been confirmed by the existence of OH stretching vibrations 45 . The peak at 1700 cm −1 points to the CO vibration band; the peak at about 1600 cm −1 to the CC band; the peak at 1400 cm −1 is in the COH vibration band; the peak at 1200 cm −1 belongs to the COC vibration band; and the peak at 1050 cm −1 belongs to the CO vibration band 41 .…”

Section: Resultsmentioning

confidence: 84%

“…As shown in Figure 1b, the hydrogen replacement of OH groups on the surface of GO was achieved by a silane modifying agent. When the peak intensity of the OH group in the fGO diminished compared to the unmodified GO 45 . In addition, in the fGO, the absorption bands at around 3050 cm −1 and 2850 cm −1 are NH stretching in amine and CH stretching of aliphatic CH 2 groups, respectively.…”

Section: Resultsmentioning

confidence: 96%

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Development of poly(ℇ‐caprolactone)‐based composite packaging films incorporated nanofillers for enhanced strawberry quality

Eskitoros‐Togay,

Bulbul,

Çanga Oymak

et al. 2023

J of Applied Polymer Sci

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The aim of the present study was to develop a packaging material for strawberry fruit by incorporating nanofiller such as graphene oxide (GO), graphene oxide modified with silane coupling agent (fGO), and titanium dioxide (TiO2) into a polycaprolactone (PCL) matrix using the solution casting method. In the first stage, graphene oxide was synthesized from graphite by the modified Hummers' method. Subsequently, the synthesized GO was modified with the silane coupling agent. PCL film, PCL/GO, PCL/fGO, PCL/GO/TiO2, and PCL/fGO/TiO2 nanocomposite films were eventually developed. The prepared films were characterized by structural, chemical, and thermal analysis by AFM, FTIR, XRD, DSC, TGA, water contact angle analysis and food packaging test. Structural and chemical analyses revealed that the synthesis and modification processes of GO were successfully achieved. The roughness values of the PCL/fGO and PCL/fGO/TiO2 films were found as 34.1 ± 1.2 nm and 43.3 ± 2.7 nm, respectively, which displayed a relatively smooth surface morphology compared to other films. The contact angle value for the PCL/fGO and PCL/fGO/TiO2 films sightly increased from 79.83° to 80.34°, respectively, with the addition of TiO2 to the matrix. The addition of GO into the polymer matrix increased the water absorption value of the PCL film to the maximum value of 19.64%; however, the addition of TiO2 nanoparticles decreased the water absorption value of the films by 14.62%. The results of the packaging test of strawberry fruit for 21 days demonstrated that the PCL/fGO/TiO2 nanocomposite film had the potential to be used as a food packaging film due to its ability to protect the freshness of strawberries.

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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 96%

Development of poly(ℇ‐caprolactone)‐based composite packaging films incorporated nanofillers for enhanced strawberry quality

Eskitoros‐Togay,

Bulbul,

Çanga Oymak

et al. 2023

J of Applied Polymer Sci

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“…There are also some C = C bonds of sp 2 carbons in the 1619 cm −1 region. The presence of a peak at 571 cm −1 in GO may be attributed to the presence of traces of Mn-O as the employed oxidizing agent 37,38 . The displayed peaks at 3176 cm −1 and 2920 cm −1 in the Alg-GO spectrum denote to the O-H and CH 2 www.nature.com/scientificreports/ stretching vibrations from graphene oxide and/or alginate, while the bands at 1088 and 1031 cm −1 are attributed to glucuronic and mannuronic units, respectively 39 .…”

Section: Methodsmentioning

confidence: 99%

Inclusion of bimetallic Fe0.75Cu0.25-BDC MOFs into Alginate-MoO3/GO as a novel nanohybrid for adsorptive removal of hexavalent chromium from water

Mahmoud

Amira

Azab

et al. 2022

Sci Rep

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Metal–organic frameworks (MOFs) as porous materials have recently attracted research works in removal of toxic pollutants from water. Cr(VI) is well-known as one of the most toxic forms of chromium and the selection of efficient and effective Cr(VI)-remediation technology must be focused on a number of important parameters. Therefore, the objective of this work is to fabricate a novel nanohybrid adsorbent for removal of Cr(VI) by using assembled bimetallic MOFs (Fe0.75Cu0.25-BDC)-bound- Alginate-MoO3/Graphene oxide (Alg-MoO3/GO) via simple solvothermal process. The aimed Fe0.75Cu0.25-BDC@Alg-MoO3/GO nanohybrid was confirmed by FTIR, SEM, TEM, XRD and TGA. Adsorptive extraction of Cr(VI) from aqueous solution was aimed by various optimized experimental parameters providing optimum pH = 3, dosage = 5–10 mg, starting concentration of Cr(VI) = 5–15 mg L−1, shaking time = 5–10 min. The point of zero charge (pHPzc) was 3.8. For Cr(VI) removal by Fe0.75Cu0.25-BDC@Alg-MoO3/GO, four isotherm models were estimated: Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) with calculated correlation coefficient (R2 = 0.9934) for Langmuir model which was higher than others. The collected results from the kinetic study clarified that pseudo-second order model is the most convenient one for describing the adsorption behavior of Cr(VI) and therefore, the adsorption process was suggested to rely on a chemisorption mechanism. Thermodynamic parameters referred that the adsorption mechanism is based on a spontaneous and exothermic process. Finally, the emerged Fe0.75Cu0.25-BDC@Alg-MoO3/GO nanohybrid was confirmed as an effective adsorbent for extraction of hexavalent chromium from real water specimens (tap, sea water and wastewater) with percentage recovery values > 98%.

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“…On the other hand, the direct addition of surfactant is a convenient and effective method to disperse GO in cement slurry solution. Yavari et al [22] modified the graphene oxide surface with γ-MPS silane and significantly improved the dispersion of the modified graphene oxide in the resin. Modified graphene oxide was also used to improve the stability of cobalt complexes and reduce the activation energy in the redox decomposition region in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydration and Physical Properties of Cement by M18 Polycarboxylate Superplasticizer Modified Graphene Oxide

Liao¹,

Li²,

Zhou³

et al. 2023

Journal of Renewable Materials

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Graphene oxide (GO) as a new nano-enhancer in cement-based materials has gained wide attention. However, GO is easy to aggregate in alkaline cement mortar with poor dispersibility. This hinders its application in practical infrastructure construction. In this work, GO-M18 polycarboxylate compound superplasticizer (GM) were obtained by compounding the M18 polycarboxylate superplasticizer with GO solution at different mass ratios. The dispersion of GM in alkaline solution was systematically studied. The phases and functional groups of GM were characterized by XRD and FTIR. The effects of GM on the cement mortar hydration and the formation of microstructure were investigated by measuring the heat of hydration, MIP, TG/DSC, and SEM. The results show that the long-chain structure of the M18 polycarboxylate superplasticizer can increase the interlayer spacing of GO and weaken the force between GO sheets. The modified GO can be uniformly dispersed in the cement slurry. GM can accelerate the early hydration process of cement, which can increase the content of Ca(OH) 2 and decrease the grain size. It can optimize the pore size distribution of cement-based materials, increase the density of harmless and less harmful pores, thereby improving mechanical properties. Such methods can transform traditional cement-based materials into stronger, more durable composites, which prolong the life of cementbased materials and reduce the amount of cement used for later maintenance. This provides an idea for achieving sustainability goals in civil engineering.

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Graphene oxide and silane-modified graphene oxide/unsaturated polyester resin nanocomposites: A comparative cure kinetic and diffusion study

Cited by 22 publications

References 33 publications

Development of poly(ℇ‐caprolactone)‐based composite packaging films incorporated nanofillers for enhanced strawberry quality

Development of poly(ℇ‐caprolactone)‐based composite packaging films incorporated nanofillers for enhanced strawberry quality

Inclusion of bimetallic Fe0.75Cu0.25-BDC MOFs into Alginate-MoO3/GO as a novel nanohybrid for adsorptive removal of hexavalent chromium from water

Study on the Hydration and Physical Properties of Cement by M18 Polycarboxylate Superplasticizer Modified Graphene Oxide

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