Size influence on optical absorption property of ultra-fine nickel hollow spheres

Li, Zhibin; Deng, Yida; Wu, Yating; Shen, Bin; Hu, Wenbin

doi:10.1007/s10853-007-1897-y

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…Au-Ni alloy formation is also supported by DRS UV-Vis analysis. The DRS UV-Vis response for Ni/ Al 2 O 3 shows a maximum (530-580 nm) that corresponds to metallic Ni [35]. In marked contrast, the spectrum recorded for Au-Ni/Al 2 O 3 (profile IIc) did not generate any detectable peak/signal corresponding to metallic Au or Ni.…”

Section: Catalyst Characterizationmentioning

confidence: 87%

Gas Phase Hydrogenation of m-Dinitrobenzene over Alumina Supported Au and Au–Ni Alloy

2008

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We report, for the first time, 100% selectivity in the continuous gas phase hydrogenation of m-dinitrobenzene to m-nitroaniline (m-NAN) over Au/Al 2 O 3 . The synthesis and application of an alumina supported Au-Ni alloy is also described where alloy formation is demonstrated by XRD, diffuse reflectance UV-Vis and HRTEM analyses. Under the same reaction conditions, Au/Al 2 O 3 delivered a higher (by close to an order of magnitude) hydrogenation rate compared with the alloy. Au-Ni/Al 2 O 3 promoted the formation of both m-NAN and m-phenylenediamine, i.e. partial and complete hydrogenation: the results are consistent with a stepwise reduction mechanism.

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Section: Catalyst Characterizationmentioning

confidence: 87%

Gas Phase Hydrogenation of m-Dinitrobenzene over Alumina Supported Au and Au–Ni Alloy

2008

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“…As shown in figure 2, with the increasing concentration of NaOH solution during the preparation process, the particle size of Ni-Co-P HSs decreases from about 500 to 100 nm. With the increase in NaOH concentration, the reaction incubation period clearly decreases and the original colloidal particles have not enough time to grow up, which causes small and homogeneous particle size of final products [17].…”

Section: Resultsmentioning

confidence: 99%

Size influence on microwave properties of Ni–Co–P hollow spheres

Li¹,

Deng²,

Shen³

et al. 2009

J. Phys. D: Appl. Phys.

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Ni–Co–P hollow spheres (HSs) of different sizes were fabricated by the autocatalytic reduction method. With the decrease in particle size, the value of complex permittivity increases and the permeability changes in the opposite direction. The resonance peaks appear in the curves of both permittivity and permeability. The former is due to atomic and electronic polarization, and the latter is caused by natural resonance. For sample 2, with a particle size of about 200 nm, the minimal reflection loss (RL) (−52.5 dB) was predicted at 11.2 GHz with a thickness of 1.6 mm. Additionally, for Ni–Co–P HSs, size dependence of minimal RL is not linear and the excellent microwave absorption property can be obtained in the size range around 200 nm.

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“…Based on the previous work of our group [24], NHSs were synthesized by the autocatalytic reduction method. The nickel hollow spheres were prepared with analytically pure nickel sulfate (NiSO 4 •6H 2 O), sodium hypophosphite (NaH 2 PO 2 •H 2 O), sodium hydroxide (NaOH), acetic acid and citric acid as starting materials.…”

Section: Methodsmentioning

confidence: 99%

Size Influence on Magnetic Properties of Nickel Hollow Spheres

Wang

Deng

2013

AMR

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Nickel hollow spheres (NHSs) with different diameter have been synthesized by the autocatalytic reduction method. The morphology, size distribution and magnetic properties of NHSs were characterized. The results indicate that when the nickel hollow spheres become smaller, mechanism of magnetization reversal varies from motion of domain wall to spin coherent rotation. After the heat treatment process, the grain size of samples becomes bigger and coercivity is enhanced because domain wall is pinned by local magnetic anisotropy induced spontaneously.

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Size influence on optical absorption property of ultra-fine nickel hollow spheres

Cited by 8 publications

References 26 publications

Gas Phase Hydrogenation of m-Dinitrobenzene over Alumina Supported Au and Au–Ni Alloy

Gas Phase Hydrogenation of m-Dinitrobenzene over Alumina Supported Au and Au–Ni Alloy

Size influence on microwave properties of Ni–Co–P hollow spheres

Size Influence on Magnetic Properties of Nickel Hollow Spheres

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