Room temperature ferromagnetism of boron-doped ZnO nanoparticles prepared by solvothermal method

Farooq, Muhammad; Xu, Xiaoguang; Yang, Hongxun; Ran, Cong-Jun; Miao, Jun; Iqbal, M. Zubair; Jiang, Yong

doi:10.1007/s12598-013-0058-5

Cited by 5 publications

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A cosolvent-water mixture was used as the dispersed medium, and monomer polymerization was initiated in a closed system. The solvothermal method can improve the reaction temperature and pressure at the same time, so that the size of particles prepared in the medium decreased significantly, and the stability of the emulsion was improved (Hoa and Huyen 2013 ; Farooq et al 2013 ; Mishra et al 2014 ).…”

Section: Methodsmentioning

confidence: 99%

Thermo-sensitive polymer nanospheres as a smart plugging agent for shale gas drilling operations

et al. 2016

View full text Add to dashboard Cite

Emulsifier-free poly(methyl methacrylate–styrene) [P(MMA–St)] nanospheres with an average particle size of 100 nm were synthesized in an isopropyl alcohol–water medium by a solvothermal method. Then, through radical graft copolymerization of thermo-sensitive monomer N-isopropylacrylamide (NIPAm) and hydrophilic monomer acrylic acid (AA) onto the surface of P(MMA–St) nanospheres at 80 °C, a series of thermo-sensitive polymer nanospheres, named SD-SEAL with different lower critical solution temperatures (LCST), were prepared by adjusting the mole ratio of NIPAm to AA. The products were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, thermogravimetric analysis, particle size distribution, and specific surface area analysis. The temperature-sensitive behavior was studied by light transmittance tests, while the sealing performance was investigated by pressure transmission tests with Lungmachi Formation shales. The experimental results showed that the synthesized nanoparticles are sensitive to temperature and had apparent LCST values which increased with an increase in hydrophilic monomer AA. When the temperature was higher than its LCST value, SD-SEAL played a dual role of physical plugging and chemical inhibition, slowed down pressure transmission, and reduced shale permeability remarkably. The plugged layer of shale was changed to being hydrophobic, which greatly improved the shale stability

show abstract

Section: Methodsmentioning

confidence: 99%

Thermo-sensitive polymer nanospheres as a smart plugging agent for shale gas drilling operations

et al. 2016

View full text Add to dashboard Cite

show abstract

Local Structure and Chemistry of C‐Doped ZnO@C Core–Shell Nanostructures with Room‐Temperature Ferromagnetism

Ngo

Cuong

et al. 2017

Adv Funct Materials

View full text Add to dashboard Cite

A superior approach is presented to study quantitatively fine structure of C‐doped ZnO nanostructure using transmission electron microscopy (TEM) from which the role of carbon in ZnO crystal to form ferromagnetism is revealed at the first time. Electron diffraction in TEM shows Wurtzite structure in the nanoparticles with lattice parameters (a = 0.327 ± 0.03 nm and c = 0.529 ± 0.04 nm) slightly different from the original structure. Interestingly, the Zn–C bonding with a bonding length of 2.58 Å is experimentally determined using atomic pair distribution function (PDF) calculated from electron diffraction data. Together with other bondings, such as C–C, Zn–O obtained from the PDF, this demonstrates migration of C atoms into ZnO crystal to substitute O vacancies. This is furthermore visualized by high‐resolution TEM imaging and elemental mapping, and strongly supports the proposal of origin of ferromagnetism in the C‐doped ZnO nanoparticles where the s–p and p–p hybridizations formed by C2p–Zn4s, and O2p–C2p orbitals are believed to cause ferromagnetism.

show abstract

Room Temperature Ferromagnetism: Nonmagnetic Semiconductor Oxides and Nonmagnetic Dopants

Yakout

2021

Journal of Elec Materi

View full text Add to dashboard Cite

Room temperature ferromagnetism of boron-doped ZnO nanoparticles prepared by solvothermal method

Cited by 5 publications

References 29 publications

Thermo-sensitive polymer nanospheres as a smart plugging agent for shale gas drilling operations

Thermo-sensitive polymer nanospheres as a smart plugging agent for shale gas drilling operations

Local Structure and Chemistry of C‐Doped ZnO@C Core–Shell Nanostructures with Room‐Temperature Ferromagnetism

Room Temperature Ferromagnetism: Nonmagnetic Semiconductor Oxides and Nonmagnetic Dopants

Contact Info

Product

Resources

About