Surface coating and characterisation of polyurea for liquid storage

Arunkumar, T.; Ramachandran, S.

doi:10.1080/01430750.2016.1222966

Cited by 44 publications

(24 citation statements)

References 5 publications

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“…The more characteristic fingerprint of inorganic Si-O-Si networks is observed at 1080-1100 cm −1 [27,28] for the nanocomposite sample containing SiO 2 , shown in the inset. The pure epoxy also exhibits a band in the same range, which is attributed to the C-O stretching (1089 cm −1 ) from the curing agent [29]. A considerable Fig.…”

Section: Characterizationmentioning

confidence: 88%

In situ synthesis of epoxy nanocomposites with hierarchical surface-modified SiO2 clusters

Adnan

Tveten

Miranti

et al. 2020

J Sol-Gel Sci Technol

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Polymer nanocomposites are often produced using in situ approaches where an inorganic filler (as the dispersed phase) is synthesized directly in an organic matrix. Such an approach generally leads to improved dispersion and reduced agglomeration of the filler material. Epoxy-based nanocomposites have demonstrated promising properties for application as high-voltage insulation materials. In this work, a sol-gel based method has been adapted to synthesize surface-functionalized SiO 2 in situ in epoxy. The synthesized SiO 2 moieties were dispersed in clusters of 10-80 nm, and formed chemical bonds with the epoxy monomers via a silane coupling agent. Raman spectra show the formation of four-membered D 1 rings, which may be part of a cage-like structure similar to that of polyhedral oligomeric silsesquioxanes (POSS). SAXS measurements indicate that the SiO 2 clusters consist of a hierarchical structure with an increasing fractal dimension with increasing SiO 2 content. The nanocomposites displayed improved thermal stability, while the glass transition behavior varied depending on the structure and content of the SiO 2 moieties. While the relative permittivity showed no significant changes from that of pure epoxy, the onset of the dielectric relaxation changed with the SiO 2 structure and content, similar to the behavior observed for the glass transition.

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Section: Characterizationmentioning

confidence: 88%

In situ synthesis of epoxy nanocomposites with hierarchical surface-modified SiO2 clusters

Adnan

Tveten

Miranti

et al. 2020

J Sol-Gel Sci Technol

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“…The phase composition of the sintered composites was studied using an x-ray diffractometer (smart lab-RIGAKU, Japan). The XRD was carried out at room temperature with 2h value ranging from 0 to 90°and wavelength of 1.54056 Å with a step of 0.05°s À1 and operational target voltage and tube current of 30KV and 100 mA (Ref 37,38). Surface topographies of the samples were obtained using a scanning electron microscope method (ZEISS SUPRA 55), and simultaneously quantitative elemental analysis was conducted (ASTM D4541) (Ref 39).…”

Section: Methodsmentioning

confidence: 99%

Effect of Multiwalled Carbon Nanotubes on Improvement of Fracture Toughness of Spark-Plasma-Sintered Yttria-Stabilized Zirconia Nanocomposites

Arunkumar

Anand

Subbiah³

et al. 2021

J. of Materi Eng and Perform

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Highly dense yttria-stabilized zirconia (YSZ) nano-ceramics reinforced with TC-CVD-synthesized multiwall carbon nanotubes (MWCNTs) were fabricated using spark plasma sintering at a temperature of 1350°C, the heating rate of 100 °C/min and pressure of 50MPa with a dwell time of 10 minutes. The identical parameters were utilized for fabricating composites with a varying weight ratio of YSZ and MWNCTs. The samples were characterized for their phase transformation, microstructure and elemental composition using x-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The physical and mechanical properties such as density, porosity, hardness, fracture toughness and wear were also investigated. The increase in the MWCNTs concentration has resulted in the deterioration of the hardness due to CNT agglomerations. The wear resistance of the composites revealed MWNCTs enhanced wear resistance of YSZ nanocomposite by undergoing MWNCTs pull-out and crack branching mechanisms. Further indentation method and single-beam V-notch beam (SEVNB) methods were utilized to study the effect of MWCNTs on the fracture toughness of the nanocomposites. The fracture toughness of YC1 (6.58 ± 0.3 MPa m1/2) was 21% higher than the YSZ (5.21 ± 0.2 MPa m1/2) due to the toughening mechanisms attributable to crack deflection, branching and bridging of MWCNTs.

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“…The wear test conditions were room temperature with ambient humidity and varying load (20 to 50 N) with sliding speed and distance of 2 m/s and 1200 m. The CTE (Coefficient of thermal expansion) was measured under argon atmosphere and thermal conductivity was measured according to ASTM E1225-13. The corrosion polarisation of the cermets were conducted with Ag/AgCl as reference electrode and Pt as counter electrode with 3.5% NaCl electrolyte[28].…”

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confidence: 99%

Influence of Nanoparticles Reinforcements on Aluminium 6061 Alloys Fabricated via Novel Ultrasonic Aided Rheo-Squeeze Casting Method

Arunkumar

Pavanan²,

Murugesan³

et al. 2021

Met. Mater. Int.

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This study emphasis on a novel fabrication technique to fabricate hybrid cermets using Al 6061 alloy with nano sized SiC, Al2O3 and TiO2 as reinforcements. During the fabrication process, the melted pool was ultrasonicated to disperse nanoparticles at 20 kHz for 5 min and pressure of 50 MPa was applied to eliminate voids. The influence of nanoparticles on physical, thermal and mechanical properties were evaluated by tensile, wear and thermal studies. Cermets with Al2O3 reinforcements showed higher mechanical performance compared to Al alloy. This enhancement could be related to the uniform distribution of Al2O3 with refinement in grain size of Al alloy which was observed via surface analysis. The morphological studies provided justifiable evidence of homogeneous distribution, nominal cluster along with agglomeration and cavities shrinking on the cermets. The agglomeration of nanoparticles along with SiC protected the cermet in corrosion and abrasive wear by ~ 97% and ~ 71%. The study evidenced the novel fabrication method using ultrasonic rheo-squeeze casting led to improvement in mechanical and thermal properties of the hybrid cermets. Graphical abstract

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Surface coating and characterisation of polyurea for liquid storage

Cited by 44 publications

References 5 publications

In situ synthesis of epoxy nanocomposites with hierarchical surface-modified SiO2 clusters

In situ synthesis of epoxy nanocomposites with hierarchical surface-modified SiO2 clusters

Effect of Multiwalled Carbon Nanotubes on Improvement of Fracture Toughness of Spark-Plasma-Sintered Yttria-Stabilized Zirconia Nanocomposites

Influence of Nanoparticles Reinforcements on Aluminium 6061 Alloys Fabricated via Novel Ultrasonic Aided Rheo-Squeeze Casting Method

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