Synthesis and magnetic properties of monodisperse CoFe2O4 nanoparticles coated by SiO2

Hu, Dengwei; Zhao, Fan; Zhang, Zhen; Miao, Lei; Ma, Rujiang; Zhao, Weixing; Ren, Lijun; Zhang, Gaini; Zhai, Le; Wang, Dongmei; Dou, Shumei

doi:10.1016/j.ceramint.2018.09.014

Cited by 21 publications

(9 citation statements)

References 16 publications

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“…The diffraction peak of CaF 2 crystals was narrow and sharp, which indicated that the prepared CaF 2 had high crystallinity, and no impurity peak was detected, indicating that the prepared CaF 2 had high purity. As shown in Figure 1b, the XRD patterns of CaF 2 @SiO 2 nanoparticles were the same as the XRD patterns of pure cubic CaF 2 crystals; only at about 2θ = 20°–25°, the pattern for CaF 2 @SiO 2 had a low and wide peak, attributed to a silica dioxide amorphous halo [37,41].…”

Section: Resultsmentioning

confidence: 83%

“…Powder coating can change the physical and chemical properties of a powder [37,38,39,40,41,42,43,44]. Hu et al [41] successfully coated SiO 2 on the surface of monodisperse CoFe 2 O 4 , proving that the silica coating can prevent the aggregation and growth of nanoparticles at high temperature, making the nanoparticles suitable for various high-temperature technological applications. Wu et al [42] prepared h-BN@Ni powders, which, compared to h-BN powders, greatly improved the mechanical properties of self-lubricating tools.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Chen

Guo

et al. 2019

Nanomaterials

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In order to reduce the influence of CaF2 addition on the mechanical properties of self-lubricating ceramic tools, we applied a silicon dioxide (SiO2) coating on calcium fluoride (CaF2) nanoparticles through hydrolysis and condensation reactions using the tetraethoxysilane (TEOS) method. The powder was dried by the azeotropic method, so that it acquired a better dispersibility. The resulting composite powders were characterized using XRD (X-ray diffraction) and TEM (transmission electron microscopy), showing that the surface of CaF2 was coated with a layer of uniform and compact SiO2. SiO2 shells with different thicknesses could be obtained by changing the amount of TEOS added, and the thickness of the SiO2 shells could be controlled between 1.5 and 15 nm. At the same time, a ceramic material containing CaF2 nanoparticles and CaF2@SiO2-coated nanoparticles was prepared. It had the best mechanical properties when CaF2@SiO2-coated nanoparticles were added; its flexural strength, fracture toughness, and hardness were 562 ± 28 MPa, 5.51 ± 0.26 MPa·m1/2, and 15.26 ± 0.16 GPa, respectively. Compared with the ceramic tool containing CaF2 nanoparticles, these mechanical properties were increased by 17.57%, 12.67%, and 4.88%, respectively. The addition of CaF2@SiO2-coated nanoparticles greatly improved the antifriction and wear resistance of the ceramic material, and the antifriction and wear resistance were balanced.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Chen

Guo

et al. 2019

Nanomaterials

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“…Due to their small size and high surface area to volume ratio, their physical and chemical properties are enhanced in comparison to their bulk state (Lisjak & Mertelj 2018). Within such small size units, the effective surface area becomes very large, owing NMs unique optical (Bhalla & Tyagi 2018), magnetic (Hu et al 2018) and mechanical properties (Vivar Mora et al 2018). In figure 7, a schematic diagram demonstrates the importance of NMs in the applications of water treatment and purification.…”

Section: Synthesis Properties and Applications Of Nanomaterials For Membrane Modificationmentioning

confidence: 99%

Pressure and osmotically driven membrane processes: A review of the benefits and production of nano-enhanced membranes for desalination

et al. 2020

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“…22 The magnetic properties of a material heavily depend on its particle size and fabrication method. 23 Various undesirable phases may exist in products, weakening their magnetic properties. 24 With the advantages and characteristics of SCS, it is possible to prepare pure CoFe 2 O 4 nanoparticles in a single step without further processing.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the apparatuses used for this process are simple and cost-effective . The magnetic properties of a material heavily depend on its particle size and fabrication method . Various undesirable phases may exist in products, weakening their magnetic properties .…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Magnetic CoFe₂O₄ Nanoparticles as Recyclable Photo-Fenton Catalysts for Removing Organic Dyes

Cao

Zuo

2020

ACS Omega

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Herein, CoFe 2 O 4 nanoparticles were directly synthesized through a solution combustion method using ferric nitrate, cobalt nitrate, and glycine as raw materials. The effects of glycine on the phase composition and magnetic properties of the CoFe 2 O 4 products were investigated. When the fuel/ferric nitrate ratio was 0.8, the obtained product was pure CoFe 2 O 4 with an average particle size of 25 nm. Furthermore, the saturation magnetization is 77.3 emu/g, which is about 95.7% that of CoFe 2 O 4 bulk materials at room temperature and good for recycling. The photo-Fenton catalytic properties of CoFe 2 O 4 were investigated for assessing its efficacy in removing dyes. It could degrade the 20 ppm MB in 75 min. To improve the photo-Fenton catalytic performance, NH 4 HCO 3 and glucose were employed as additives. Due to the pores formed by NH 4 HCO 3 and glucose, the G-CoFe 2 O 4 and N-CoFe 2 O 4 could degrade the 20 ppm MB in 40 and 25 min, respectively. The results indicated that these additives can effectively improve the catalytic activity of CoFe 2 O 4 . The modified CoFe 2 O 4 is a promising alternative recyclable photo-Fenton catalyst for removing organic dyes.

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Synthesis and magnetic properties of monodisperse CoFe2O4 nanoparticles coated by SiO2

Cited by 21 publications

References 16 publications

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Pressure and osmotically driven membrane processes: A review of the benefits and production of nano-enhanced membranes for desalination

Direct Synthesis of Magnetic CoFe₂O₄ Nanoparticles as Recyclable Photo-Fenton Catalysts for Removing Organic Dyes

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Synthesis and magnetic properties of monodisperse CoFe2O4 nanoparticles coated by SiO2

Cited by 21 publications

References 16 publications

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Pressure and osmotically driven membrane processes: A review of the benefits and production of nano-enhanced membranes for desalination

Direct Synthesis of Magnetic CoFe2O4 Nanoparticles as Recyclable Photo-Fenton Catalysts for Removing Organic Dyes

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Product

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Direct Synthesis of Magnetic CoFe₂O₄ Nanoparticles as Recyclable Photo-Fenton Catalysts for Removing Organic Dyes