The Role of Urea on the Hydrothermal Synthesis of Boehmite Nanoarchitectures

Ameri, Elham; Abdollahifar, Mozaffar; Reza, Zamani Mohammad; Nekouei, Hosain

doi:10.13168/cs.2016.0025

Cited by 13 publications

(4 citation statements)

References 32 publications

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“…Nanostructured plates grew on the as-received abrasive material covering its surface. An increase in the surface area by the deposition of similar nanoparticles can be expected, as measured for similar synthesized AlOOH particles [5].…”

Section: Resultssupporting

confidence: 66%

Surface Modification of Alumina Particles to Enhance Bonding Properties with Rubber and Resin in Grinding Tools

Čelko

Bednaříková

Remešová

et al. 2022

SSP

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The mechanical properties of grinding-tools relies highly on adhesion between the abrasive particles and the bonding phase, generally composed of organic rubber or resin materials. The surface modification of abrasive particles represents an industrial alternative to improve the connection with the bonding phase material. However, increasing the roughness of abrasive particles is a challenging process because of their high chemical stability. In the present study, three different approaches are investigated to modify the surface of industrially used alumina abrasive particles. Chemical erosion under harsh acidic and alkaline conditions, and hydrothermal deposition of aluminium-based coatings were used for the surface modification of the abrasive particles. The chemical stability of alumina particles was demonstrated by the chemical etching while the succesufull surface deposition of AlOOH crystals modified the apparent roughness of the processed powder particles. Morphological changes after each treatment were studied by scanning electron microscopy and the phase composition was confirmed by X-ray diffraction.

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Section: Resultssupporting

confidence: 66%

Surface Modification of Alumina Particles to Enhance Bonding Properties with Rubber and Resin in Grinding Tools

Čelko

Bednaříková

Remešová

et al. 2022

SSP

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“…As shown in Figure 2a, for the B-N, five strong bands at 480, 630, 746, 1064, and 1171 cm -1 were observed. As can be seen, for both samples, the intensive bands at 3092 and 3300 cm -1 belong to the υ as (Al)O-H and υ s (Al)O-H stretching vibrations [21]. The two weak bands at 1970 and 2090 cm -1 are the combination bands.…”

Section: Resultsmentioning

confidence: 75%

“…Synthesis method has an important effect on properties and characterizations of material products. Conventional processes for synthesizing boehmite nanostructures include sol-gel [18], precipitation [19], hydrothermal [20,21] and solvothermal [22] and other related routes [23]. Among the reported synthetic routes, solvothermal technique have been broadly employed as the effective method do to the mild synthesis conditions and flexible change of experimental parameters.…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF NaOH AND KOH ON THE CHARACTERIZATION OF MESOPOROUS AlOOH IN THE SOLVOTHERMAL ROUTE

Salimi¹

2016

Ceramics - Silikaty

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In this study boehmite nanostructures have been successfully synthesized using solvothermal method at 180° C and at high basic pH (~13.5), when ethanol was as solvent. The effects of NaOH and KOH as pH adjusting regents on the characterization of synthesized samples were investigated in detail. X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM), were used to characterize the samples. The specific surface area, pore size distribution and pore structure of the different boehmite structures at different condition were also discussed by the N 2 adsorption/desorption test. According to our experimental results, the FESEM micrographs show that the samples synthesised by NaOH and KOH are nanostructure and nanoparticles, respectively. The obtained boehmite nanostructure from NaOH exhibited large surface area of 144 m 2 •g -1 and high total pore volume of 1.28 cm 3 •g -1 .

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“…In this study, we suggested the use of urea as an effective electrolyte additive for LMBs. To date, urea has been used as a dispersant agent and surfactant for the hydrothermal method for the appropriate morphology. − In addition, urea is a H bond donor and is generally used to decrease the melting point of complex systems. , In this work, we proposed the inexpensive and facile use of urea as a new electrolyte additive for LMBs. This electrolyte additive could form a stable and uniform SEI film, which could effectively suppress the growth of lithium dendrites and improve the cyclability of LMBs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Urea as Electrolyte Additive for Stabilization of Lithium Metal Electrodes

Kim

Verma

Kim

et al. 2020

ACS Sustainable Chem. Eng.

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Owing to its lowest standard redox potential, low density, and high theoretical specific capacity, lithium metal has been considered to be the ideal anode material for secondary lithium batteries. However, lithium metal is thermodynamically unstable in liquid organic electrolytes (LOEs). When lithium metal comes in contact with an LOE, it reacts easily with it to form the solid electrolyte interphase (SEI) layer. Once the stable and robust SEI layer forms, it can inhibit the direct contact between lithium metal and LOE and the further decomposition of the electrolyte. Nevertheless, the inhomogeneity in chemical composition or thickness of the SEI layer can cause the growth of lithium dendrites, which lead to short-circuits in batteries. In this study, we suggested the use of urea as a new electrolyte additive to restrain the growth of lithium dendrites via the formation of a uniform and robust SEI layer on the lithium surface. The Li symmetric cell with 0.5 M urea electrolyte additive exhibited better cyclability over 415 cycles at 1 mA cm–2; this number of cycles was >40 times larger than that of the Li symmetric cell without urea additive. Further, the Li–O2 cell with electrolyte additive was cycled for more than 200 cycles at 0.1 mA cm–2 under the limited capacity mode of 1000 mA h g–1.

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The Role of Urea on the Hydrothermal Synthesis of Boehmite Nanoarchitectures

Cited by 13 publications

References 32 publications

Surface Modification of Alumina Particles to Enhance Bonding Properties with Rubber and Resin in Grinding Tools

Surface Modification of Alumina Particles to Enhance Bonding Properties with Rubber and Resin in Grinding Tools

THE EFFECT OF NaOH AND KOH ON THE CHARACTERIZATION OF MESOPOROUS AlOOH IN THE SOLVOTHERMAL ROUTE

Effect of Urea as Electrolyte Additive for Stabilization of Lithium Metal Electrodes

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