1,720,974 research outputs found
Advanced Bio-Based UV-Curable Anticorrosive Coatings Reinforced by hBN
No full textHere, furfuryl methacrylate (FAM) was first successfully synthesized. Bulk hexagonal boron nitride (hBN) nanosheets were exfoliated and dispersed in FAM based on the strong pi-pi interaction between hBN and FAM. The few-layer hBN nanosheets as-prepared possessed an average thickness of similar to 3 nm (less than 10 layers) and exhibited superior storage stabilization under environment condition in FAM. Moreover, we creatively applied FAM solutions containing 0.25-0.75 wt% of hBN as reactive diluents for the epoxidized soybean oil methacrylate (ESOM) matrix to effectively enhance its corrosion protection by suppressing the penetration of aggressive species. The electrochemical results revealed that the impedance of the coating containing 0.75 wt. % hBN is similar to 200 times bigger than that of the blank coating specimen
Advanced Bio-Based UV-Curable Anticorrosive Coatings Reinforced by hBN
No full textHere, furfuryl methacrylate (FAM) was first successfully synthesized. Bulk hexagonal boron nitride (hBN) nanosheets were exfoliated and dispersed in FAM based on the strong pi-pi interaction between hBN and FAM. The few-layer hBN nanosheets as-prepared possessed an average thickness of similar to 3 nm (less than 10 layers) and exhibited superior storage stabilization under environment condition in FAM. Moreover, we creatively applied FAM solutions containing 0.25-0.75 wt% of hBN as reactive diluents for the epoxidized soybean oil methacrylate (ESOM) matrix to effectively enhance its corrosion protection by suppressing the penetration of aggressive species. The electrochemical results revealed that the impedance of the coating containing 0.75 wt. % hBN is similar to 200 times bigger than that of the blank coating specimen
Variation of mechanical and thermal properties in sustainable graphene oxide/epoxy composites
No full textIn this work, the functional graphene oxide (bGO) was facilely synthesized through a grafted reaction between graphene oxide (GO) and bio-based bis-furan di-epoxide (BFDE). The structure of bGO was confirmed by FTIR spectra and Raman spectra. The properties of polymer composite materials depend on the distribution of the nanofiller in the matrix and due to the presence of polymer chains our bGO sheets exhibit a better dispersibility in solvents and polymer matrix, which provides a potential opportunity for the preparation of BFDE composites with excellent performance. Bio-based BFDE composites containing 0.05-0.5 wt.% of bGO exhibit superior mechanical and thermal properties. The addition of just 0.5 wt% such bGO to an BFDE causes 80%, 49%, 21%, 69% and 97% enhancement in tensile strength, flexural strength, flexural modulus, critical stress intensity factor and critical strain energy release rate, respectively. The thermal decomposition temperature T-d of bGO/BFDE composites was increased about similar to 17 degrees C compared to blank BFDE sample. In addition, we found that introducing unmodified GO to epoxy matrix lead to an insignificant increase of the thermal property of the resulting GO/BFDE composites. The enhanced mechanical properties and thermal properties of bGO/BFDE composites could be attributed to strong interfacial interactions and high affinity between bGO and epoxy matrix
Variation of mechanical and thermal properties in sustainable graphene oxide/epoxy composites
No full textIn this work, the functional graphene oxide (bGO) was facilely synthesized through a grafted reaction between graphene oxide (GO) and bio-based bis-furan di-epoxide (BFDE). The structure of bGO was confirmed by FTIR spectra and Raman spectra. The properties of polymer composite materials depend on the distribution of the nanofiller in the matrix and due to the presence of polymer chains our bGO sheets exhibit a better dispersibility in solvents and polymer matrix, which provides a potential opportunity for the preparation of BFDE composites with excellent performance. Bio-based BFDE composites containing 0.05-0.5 wt.% of bGO exhibit superior mechanical and thermal properties. The addition of just 0.5 wt% such bGO to an BFDE causes 80%, 49%, 21%, 69% and 97% enhancement in tensile strength, flexural strength, flexural modulus, critical stress intensity factor and critical strain energy release rate, respectively. The thermal decomposition temperature T-d of bGO/BFDE composites was increased about similar to 17 degrees C compared to blank BFDE sample. In addition, we found that introducing unmodified GO to epoxy matrix lead to an insignificant increase of the thermal property of the resulting GO/BFDE composites. The enhanced mechanical properties and thermal properties of bGO/BFDE composites could be attributed to strong interfacial interactions and high affinity between bGO and epoxy matrix
Ultrahigh performance heat spreader based on gas-liquid exfoliation boron nitride nanosheets
No full textDue to their high thermal conductivity and insulation performance, boron nitride nanosheets (BNNS) have great promise to fabricate thermal management equipment for application in power electronics. The liquid-phase exfoliation route has been regarded as the most commonly used approach to produce single and few-layered BNNS for many research fields. However, this process takes a long time, and the production yield is extremely low. In this work, an efficient technique to obtain few-layered (mostly < 5 layers), high-yield (similar to 33%), and plane-defect-free BNNS by the combination of liquid N-2 (L-N-2) gasification and liquid exfoliation was developed. The as-obtained BNNS suspensions could be vacuum filtered to make a thermal conductive film named a BNNS heat spreader which possessed a superior thermal conductivity of 61.2W m(-1) K-1 at room temperature. In addition, we also proved that the thermal conductivity of the BNNS heat spreader increased with the increase of density, creating an approach for fine tuning the thermal property of this heat spreader
Corrosion Inhibition Performance of 2,3-dimercaptosuccinic Acid on Copper
No full textObjective 2,3-dimercaptosuccinic acid(DMSA) was synthesized with maleic acid as raw material, to study the corrosion inhibition performance of DMSA on copper in 0.5 mol/L NaOH solution. Methods DMSA was prepared by methods of addition, elimination, addition and hydrolysis with maleic acid as raw material, the structure of which was then characterized by Fourier infrared spectroscopy (IR) and mass spectrometry (MS). The corrosion rates of copper in 0.5 mol/L NaOH supplemented with different concentrations of DMSA were investigated by static weight loss tests, the corrosion inhibition performance was investigated by polarization curves and electrochemical impendence spectroscopy (EIS), respectively. Copper surface corrosion morphology was observed by scanning electronmicroscopy (SEM). Results IR and mass spectrometry jointly confirmed that the target product was DMSA. The corrosion rates of Cu in 0.5 mol/L NaOH were 7.60, 3.25, 2.13 mug/(cm~2·h) with supplementation of 0, 2.5, 5.0 g/L DMSA, respectively. When the DMSA concentration in NaOH solution was 5.0 g/L, the inhibition efficiency reached 94.92%. Conclusion DMSA could absorb on the copper surface, decrease water erosion and increase the corrosion product film resistance and the charge transfer resistance. DMSA was an anodic inhibitor
The efficient exfoliation and dispersion of hBN nanoplatelets: advanced application to waterborne anticorrosion coatings
No full textAlthough numerous papers have reported that graphene is a superior anticorrosion nanofiller, it has also been demonstrated that graphene cannot be used as a long-term anticorrosion barrier due to its essential high conductivity. Herein, an anticorrosive nanofiller (BNQDs@hBN) combining the nanomaterial boron nitride quantum dots (BNQDs) with insulating hexagonal boron nitride (hBN) is put forward. The homogeneous dispersion of BNQDs@hBN in an epoxy matrix was achieved with the assistance of BNQDs, and was based on strong - interactions between h-BN and BNQDs, as confirmed via UV-vis spectra. Embedding a small percentage of BNQDs@hBN in a waterborne epoxy (WEP) coating effectively improves the barrier properties of the coating by inhibiting the penetration of corrosive ions. Polarization tests revealed that the protection efficiency and corrosion rate of an epoxy coating with 0.5 wt% BNQDs@hBN were 99.99% and 6.482 x 10(-5) mm year(-1), respectively. Electrochemical impedance spectroscopy (EIS) results demonstrated that the 0.5 wt% BNQDs@hBN coating system showed a higher impedance modulus (>10(7)) than that of a blank specimen after immersion for 60 days in 3.5 wt% NaCl(aq)
Efficient exfoliation of layered materials by waste liquor
No full textBased on their unique material properties, two-dimensional (2D) nanomaterials such as graphene, molybdenum disulfide (MoS2), and boron nitride (BN) have been attracting increased research interest. The potential of 2D materials, in the form of nanoplatelets that are used as new materials, will be important to both nanomaterials and advanced materials. Water is usually considered to be the ideal dispersed medium, and the essential hydrophobicity and limitations to mass production of 2D nanoplatelets have become quite serious obstacles to their usage in various fields. In this paper, pulping black liquor was used as dispersant, with high concentration of lignin to get single-and few-layered nanoplatelets. The whole process required only the high-shear mixing of 2D layered materials and pulping waste liquor. This method was not only simple and efficient but also environmentally friendly and resource-recycling. Moreover, the fabricated single-or few-layered nanoplatelets possessed good solubility in aqueous solution due to their edge functionalization, and could be well dispersed in water at concentrations (10 mg ml(-1) for graphene, 6.3 mg ml(-1) for MoS2, and 6.0mg ml(-1) for BN) which were much higher than that of other methods. The dispersions of graphene, MoS2, and BN nanosheets were highly stable over several months, which allowed us to easily prepare graphene, MoS2, and BN films through simple vacuum filtration or spraying. These results indicated that pulping black liquor can be used as a material or reagent, and the mass production of 2D material is possible in a simple and fast method
Facile Preparation of AT-PEG Polymer and Its Corrosion Inhibition Performance
No full textAniline tetramer grafted polyethylene glycol methyl ether (AT-PEG) was obtained from aniline tetramer (AT), polyethylene glycol (PEG) and toluene-2,4-diisocyanate (TDI). Then the structure of AT-PEG was characterized by fourier infrared spectroscopy (FT-IR) and nuclear magnetic resonance (H-1 NMR). The corrosion inhibition performance of AT-PEG for Q235 carbon steel in 1.0 M HCl solution has been investigated using static weight loss, electrochemical impendence spectroscopy (EIS) and polarization curves, respectively. The results proved that the corrosion inhibition efficiency increased with the increase of AT-PEG, and the corrosion inhibition efficiency of hydrochloric acid solution reached its maximum of 92.50% in the concentration of 100 mg/L. Here, the results of static weight loss, electrochemical impendence spectroscopy (EIS) and polarization curves were in good agreement with each other
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