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Volumn 17, Issue 25, 2001, Pages 7717-7720

Formation of colloidal gold nanoparticles in an ultrasonic field: Control of rate of gold(III) reduction and size of formed gold particles

Author keywords

[No Author keywords available]

Indexed keywords

NANOPARTICLES;

EID: 0035846795     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la010414l     Document Type: Article
Times cited : (176)

References (37)
  • 8
    • 0345977867 scopus 로고
    • (a) Schmid, G. Chem. Rev. 1992, 92, 1709-1727.
    • (1992) Chem. Rev. , vol.92 , pp. 1709-1727
    • Schmid, G.1
  • 19
    • 0011429751 scopus 로고    scopus 로고
    • note
    • For example, there would be the following difficulties in (I) the control of the rate of reduction in conventional thermal reduction systems, in (II) the precise determination of the rate of reduction of metal ions because the rate was often too fast to trace the course of the reduction, and in (III) the quantitative analysis for the concentration of unreduced metal ions coexisting with the formed colloidal particles and their stabilizer in a solution.
  • 22
    • 0011432789 scopus 로고    scopus 로고
    • note
    • 2 formation during the sonolysis of pure water was estimated by Fricke dosimetry to be ca. 10 μM/min in an argon atmosphere.
  • 28
    • 0011384045 scopus 로고    scopus 로고
    • note
    • max becomes lower because the value of P increases with increasing the amount of water vapor inside the bubble. In addition, the value of γ also decreases because the γ value of water is substantially lower than that of argon gas (e.g., γ = 1.67 for argon and ca. 1.3 for water vapor). Consequently, the maximum temperature in the cavitation bubbles drops with increasing the amount of water vapor inside the bubble.
  • 31
    • 0011385067 scopus 로고    scopus 로고
    • note
    • Specimens for TEM observation were prepared as follows: Alumina powders with a nominal particle size of 0.5 μm were added in the irradiated solution to immobilize the formed gold particles on the surface of the alumina powders. This procedure was carried out to avoid the aggregation of gold particles under the subsequent drying processes. The suspension containing gold particles immobilized on the alumina powders was washed with distilled water. The powders were then dispersed in water again, which was dropped onto a Cu grid coated with a colloidion film and dried in a vacuum. Observations were performed using a JEOL JEM-100S electron microscope at an acceleration voltage of 100 kV.
  • 32
    • 0011473238 scopus 로고    scopus 로고
    • note
    • As a preliminary experiment to estimate the strength of,the shock wave, the effect of cavitation on an immersed aluminum foil was investigated. The result showed that no pit attributed to cavitation damage was observed, suggesting that the mechanical effect due to a shock wave would be relatively weak in the present 200 kHz sonication system.
  • 33
    • 0011432790 scopus 로고    scopus 로고
    • note
    • There are two reasons why we regard radical reactions in the present study as a mild condition. First, gold(III) ions are nonvolatile and therefore would not be expected to enter the gas phase of the hot bubbles. Second, according to the Gibbs adsorption equation, gold(III) ions could not be accumulated at the interface of the bubbles. On the basis of these reasons, the reduction of gold(III) ions with reducing radicals, which escaped from the hot bubbles, proceeds in the bulk solution at ambient temperature. These radical reactions that occurred in the bulk solution are also similar to the radiation chemistry, in which radical reactions rapidly proceed at an ambient temperature.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.