Ultrasound-assisted green synthesis of nanocrystalline ZnO in the ionic liquid [hmim][NTf2]

Goharshadi, Elaheh Kafshdare; Ding, Yulong; Jorabchi, Majid Namayandeh; Nancarrow, Paul

doi:10.1016/j.ultsonch.2008.05.017

Cited by 105 publications

(30 citation statements)

References 11 publications

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“…There are some advantages in this preparation method, including minimum agglomeration and better stability. In the two-step fabrication method [17][18], NPs are first synthesized/acquired, followed by dispersing them into the base liquid (such as W or mixture of W and EG) by techniques including high shear [19][20] and ultrasound [21]. Currently, availability of NPs from commercial sources and different suppliers has attractedresearchers to this method, since they can have several choices for a certain nanoparticle, which allow effective and comparative research.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Characterization and Thermophysical Property Evaluation of SiC Nanofluids for Heat Transfer Applications

et al. 2014

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Nanofluids (NFs) are nanotechnology-based colloidal suspensions fabricated by suspending nanoparticles (NPs) in a base liquid. These fluids have shown potential to improve the heat transfer properties of conventional heat transfer fluids. In this study we report in detail on fabrication, characterization and thermo-physical property evaluation of SiC NFs, prepared using SiC NPs with different crystal structures, for heat transfer applications. For this purpose, a series of SiC NFs containing SiC NPs with different crystal structure (α-SiC and β-SiC) were fabricated in a water (W)/ethylene glycol (EG) mixture (50/50 wt% ratio). Physicochemical properties of NPs/NFs were characterized by using various techniques, such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fouriertransform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and Zeta potential analysis. Thermo-physical properties including thermal conductivity (TC) and viscosity for NFs containing SiC particles (α-and β-phase) weremeasured. The results show among all suspensions NFs fabricated with α-SiC particles have more favorable thermo-physical properties compared to the NFs fabricated with β-SiC.The observed difference is attributed to combination of several factors, including crystal structure (β-vs. α-), sample purity, and residual chemicals exhibited on SiCNFs. A TC enhancement of ∼20% while 14% increased viscosity were obtained for NFs containing 9 wt% of particular type of α-SiC NPs indicating promising capability of this kind of NFs for further heat transfer characteristics investigation.

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Section: Introductionmentioning

confidence: 99%

Fabrication, Characterization and Thermophysical Property Evaluation of SiC Nanofluids for Heat Transfer Applications

et al. 2014

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“…Ionic liquids are favorable media for the electrostatic stabilization of preformed NPs at room temperature [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Sonochemical synthesis and measurement of optical properties of zinc sulfide quantum dots

Goharshadi

Sajjadi

Mehrkhah

et al. 2012

Chemical Engineering Journal

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“…[60] For instance, sonochemical preparation ZnO nanoparticles of about 60 nm in size in a RTIL, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, was successfully achieved. [61] Thus, the utilization of ILs with a low measurable vapor pressure and low volatility as a reaction medium in sonochemistry appears to be beneficial because the advantages of ILs are indeed very important parameters to generate cavitation for sonochemical reactions. Thus, ultrasound syntheses are promising as novel, simple, convenient, elegant, rapid, cost effective, efficient, and green synthetic pathways to oxide nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Sonochemical Synthesis of 0D, 1D, and 2D Zinc Oxide Nanostructures in Ionic Liquids and Their Photocatalytic Activity

Alammar

Mudring

2011

ChemSusChem

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Ultrasound synthesis of zinc oxide from zinc acetate and sodium hydroxide in ionic liquids (ILs) is a fast, facile, and effective, yet highly morphology- and size-selective route to zinc oxide nanostructures of various dimensionalities. No additional organic solvents, water, surfactants, or templating agents are required. Depending on the synthetic conditions, the selective manufacturing of 0D, 1D, and 2D ZnO nanostructures is possible: Whereas the formation of rodlike structures is typically favored, ZnO nanoparticles can be obtained either under strongly basic conditions or by use of ILs with a long alkyl chain, such as 1-n-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C(n)mim][Tf(2)N]; n>8). A short ultrasound irradiation time favors the formation of ZnO nanosheets. Prolonged irradiation leads to the conversion of the ZnO nanosheets into nanorods. In contrast, ionothermal synthesis (conventional heating) does not allow for morphology tuning by variation of the IL or other synthesis conditions, as the longer reaction times required lead always to the formation of well-developed hexagonal nanocrystals with prismatic tips. The ZnO nanostructures synthesized by using ultrasound were efficient photocatalysts in the photodegradation of methyl orange. The photoactivity was observed to be as high as 95 % for ZnO nanoparticles obtained in [C(10)mim][Tf(2)N].

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Ultrasound-assisted green synthesis of nanocrystalline ZnO in the ionic liquid [hmim][NTf2]

Cited by 105 publications

References 11 publications

Fabrication, Characterization and Thermophysical Property Evaluation of SiC Nanofluids for Heat Transfer Applications

Fabrication, Characterization and Thermophysical Property Evaluation of SiC Nanofluids for Heat Transfer Applications

Sonochemical synthesis and measurement of optical properties of zinc sulfide quantum dots

Sonochemical Synthesis of 0D, 1D, and 2D Zinc Oxide Nanostructures in Ionic Liquids and Their Photocatalytic Activity

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