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Effect of Microwave Radiation Power on the Size of Aggregates of ZnO NPs Prepared Using Microwave Solvothermal Synthesis.

Nanomaterials (Basel, Switzerland) · 2018 · Unclear · Insufficient evidence

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Changing microwave heating power during microwave solvothermal synthesis altered ZnO nanoparticle aggregate size, with aggregates ranging from 60 to 120 nm depending on microwave power. Increasing microwave power reduced total synthesis time while single ZnO …

Study snapshot

PublicationNanomaterials (Basel, Switzerland) · 2018
Study typeengineering
Reported directionUnclear
Evidence ratingInsufficient

Abstract

This paper reports the possibility of changing the size of zinc oxide nanoparticles (ZnO NPs) aggregates through a change of synthesis parameters. The effect of the changed power of microwave heating on the properties of ZnO NPs obtained by the microwave solvothermal synthesis from zinc acetate dissolved in ethylene glycol was tested for the first time. It was found that the size of ZnO aggregates ranged from 60 to 120 nm depending on the power of microwave radiation used in the synthesis of ZnO NPs. The increase in the microwave radiation power resulted in the reduction of the total synthesis time with simultaneous preservation of the constant size and shape of single ZnO NPs, which were synthesized at a pressure of 4 bar. All the obtained ZnO NPs samples were composed of homogeneous spherical particles that were single crystals with an average size of 27 ± 3 nm with a developed specific surface area of 40 m²/g and the skeleton density of 5.18 ± 0.03 g/cm³. A model of a mechanism explaining the correlation between the size of aggregates and the power of microwaves was proposed. This method of controlling the average size of ZnO NPs aggregates is presented for the first time and similar investigations are not found in the literature.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering
Effect directionunclear
PopulationNot supplied
Sample sizeNot supplied
Exposuremicrowave
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Changing microwave heating power during microwave solvothermal synthesis altered ZnO nanoparticle aggregate size, with aggregates ranging from 60 to 120 nm depending on microwave power. Increasing microwave power reduced total synthesis time while single ZnO nanoparticles remained homogeneous spherical single crystals with an average size of 27 ± 3 nm (synthesized at 4 bar).

Outcomes measured

  • ZnO nanoparticle aggregate size (nm)
  • Single ZnO nanoparticle size and shape
  • Synthesis time
  • Specific surface area (m²/g)
  • Skeleton density (g/cm³)

Limitations

  • Microwave frequency not reported in abstract
  • No biological/health outcomes assessed (materials synthesis study)
  • Sample size/number of experimental runs not reported in abstract
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": "microwave",
    "source": "microwave heating (solvothermal synthesis)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "ZnO nanoparticle aggregate size (nm)",
    "Single ZnO nanoparticle size and shape",
    "Synthesis time",
    "Specific surface area (m²/g)",
    "Skeleton density (g/cm³)"
  ],
  "main_findings": "Changing microwave heating power during microwave solvothermal synthesis altered ZnO nanoparticle aggregate size, with aggregates ranging from 60 to 120 nm depending on microwave power. Increasing microwave power reduced total synthesis time while single ZnO nanoparticles remained homogeneous spherical single crystals with an average size of 27 ± 3 nm (synthesized at 4 bar).",
  "effect_direction": "unclear",
  "limitations": [
    "Microwave frequency not reported in abstract",
    "No biological/health outcomes assessed (materials synthesis study)",
    "Sample size/number of experimental runs not reported in abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation power",
    "microwave heating",
    "microwave solvothermal synthesis",
    "zinc oxide",
    "ZnO nanoparticles",
    "aggregate size",
    "nanomaterials"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.3390/nano8050343
PubMed: 29783651

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