Synthesis of ruthenium catalysts functionalized graphene oxide for self-healing applications

Mariconda, Annaluisa; Longo, Pasquale; Agovino, Anna; Guadagno, Liberata; Sorrentino, Andrea; Raimondo, Marialuigia

doi:10.1016/j.polymer.2015.04.048

Cited by 34 publications

(22 citation statements)

References 40 publications

(32 reference statements)

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“…After an initial delay, the recovery mechanism is evidenced by a rise of the modulus up to a maximum and a subsequent reduction of the healing efficiency. This decrease of the healing efficiency after a maximum has previously been found in the literature [79] and it has been ascribed to a crack propagation as a result of the cyclic fatigue stress. The sample containing nonfunctionalized carbon nanotubes, TCTBD + 0.5%MWCNT, did not show any healing mechanisms, demonstrating that MWCNTs alone are not able to confer self-healing functionality to the epoxy resin.…”

Section: Resultssupporting

confidence: 72%

Reversible Self-Healing Carbon-Based Nanocomposites for Structural Applications

et al. 2019

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Reversible Hydrogen Bonds (RHB) have been explored to confer self-healing function to multifunctional nanocomposites. This study has been carried out through a sequence of different steps. Hydrogen bonding moieties, with the intrinsic ability to simultaneously perform the functions of both hydrogen donors and acceptors, have been covalently attached to the walls of carbon nanotubes. The epoxy matrix has been modified to adapt the formulation for hosting self-healing mechanisms. It has been toughened with different percentages of rubber phase covalently linked to the epoxy precursor. The most performant matrix, from the mechanical point of view, has been chosen for the incorporation of MWCNTs. Self-healing performance and electrical conductivities have been studied. The comparison of data related to the properties of nanocomposites containing incorporated functionalized and nonfunctionalized MWCNTs has been performed. The values of the electrical conductivity of the self-healing nanocomposites, containing 2.0% by weight of functionalized multiwalled carbon nanotubes (MWCNTs), range between 6.76 × 10−3 S/m and 3.77 × 10−2 S/m, depending on the nature of the functional group. Curing degrees, glass transition temperatures, and storage moduli of the formulated multifunctional nanocomposites prove their potential for application as functional structural materials.

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Section: Resultssupporting

confidence: 72%

Reversible Self-Healing Carbon-Based Nanocomposites for Structural Applications

et al. 2019

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“…Currently, polymeric nanocomposite materials have numerous applications. For example, such materials have been used in organic coatings [4], self-healing materials [5], self-repairing aeronautic panels [6], automotive applications [7], food packaging [8], and gas barrier applications [9] .…”

Section: Introductionmentioning

confidence: 99%

Eco-friendly date-seed nanofillers for polyethylene terephthalate composite reinforcement

Elkhouly

Rushdi

Abdel-Magied

2020

Mater. Res. Express

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Polymer composites have been widely exploited in numerous industries. Micro-particle fillers are typically added as reinforcement materials to improve the characteristics of these composites. In this work, organic nanoparticles of date seeds were added as a filler for polyethylene terephthalate (PET) to produce enhanced polymer nanocomposites. A date-seed nanofiller (DSN) was prepared and examined with x-ray diffraction measurements, and then added to PET by hot compression. The characteristics of the PET-DSN composite were experimentally investigated through tests of mass loss, compressive strength, and Vickers micro-hardness. The PET-DSN microstructure was inspected using a scanning electron microscope and Fourier-transform infrared spectroscopy. The results show chemical stability of the PET-DSN composite. Moreover, key mechanical properties of the composite, namely hardness, compressive strength and wear resistance, were improved and optimized with a DSN reinforcement of 0.75 wt%.

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“…In addition, the peaks at around 1639 cm −1 wereascribed to the skeletal vibrations from unoxidized graphitic domains and the peak at~2900 cm −1 corresponds to aromatic ν(C-H) bonds of graphene oxide. In comparison to G-COOH, the FT-IR spectra of G-CL and G-CLRu(II) changedslightly changed (including new peaks, peak shifting, and variations in the peak intensities), which is due to the attachment of the chiral-Rucomplex to the surface of graphene oxide [29,30]. The FT-IR spectra of G-CL showed peaks at 3076-3312, 1698-1725, and 1256-1271 cm −1 thatwere assigned to ν(N-H), ν(C-O), and ν(C=S), respectively.…”

Section: Characterization Of G-clru(ii)mentioning

confidence: 99%

Stepwise Construction of Ru(II)Center Containing Chiral Thiourea Ligand on Graphene Oxide: First Efficient, Reusable, and Stable Catalyst for Asymmetric Transfer Hydrogenation of Ketones

2020

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Heterogenization of homogenous catalysts on solid support has attracted tremendous attention in organic synthesis due to the key benefits of heterogenized catalysts such as easy recovery and reusability. Although a considerable number of heterogenized catalysts are available, to the best of our knowledge, there is no efficient and reusable heterogenized catalyst reported for asymmetric reactions to date. Herein, we prepared a [RuCl2(η6-p-cymene)]/chiralthiourea ligand covalently bonded to graphene nanosheets (G-CLRu(II), where G represents graphene oxide (GO), CL denotes chiral N-((1-phenylethyl)carbamothioyl)acetamide and Ru(II) symbolizes [RuCl2(η6-p-cymene)]), for the asymmetric transfer hydrogenation of ketones. Five simple steps were involved in the preparation of the G-CLRu(II) catalyst. The structure of G-CLRu(II) was investigated by means of various spectroscopic and microscopic techniques. Coordination mode and covalent bonding involved in the G-CLRu(II) structure we reconfirmed. G-CLRu(II) demonstrated good catalytic performance towards the asymmetric transfer hydrogenation of ketones (conversion of up to 95%, enantiomeric excesses (ee) of up to 99%, and turnover number (TON) and turnover frequency (TOF) values of 535.9 and 22.3 h−1, respectively). A possible mechanism is proposed for the G-CLRu(II)-catalyzed asymmetric transfer hydrogenation of ketones. Recovery (~95%), reusability (fifth cycle, yield of 89% and ee of 81%), and stability of G-CLRu(II) were found to be good. We believe that the present stepwise preparation of G-CLRu(II) opens a new door for designing various metal-centered heterogenized chiral catalysts for asymmetric synthesis.

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Synthesis of ruthenium catalysts functionalized graphene oxide for self-healing applications

Cited by 34 publications

References 40 publications

Reversible Self-Healing Carbon-Based Nanocomposites for Structural Applications

Reversible Self-Healing Carbon-Based Nanocomposites for Structural Applications

Eco-friendly date-seed nanofillers for polyethylene terephthalate composite reinforcement

Stepwise Construction of Ru(II)Center Containing Chiral Thiourea Ligand on Graphene Oxide: First Efficient, Reusable, and Stable Catalyst for Asymmetric Transfer Hydrogenation of Ketones

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