Electrokinetic properties of monodisperse colloidal dispersions of zinc sulfide

Durán, J.D.G.; Guindo, M.C.; Delgado, Ángel Acuña

doi:10.1007/bfb0118520

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…When measuring EPM at this concentration, it was observed that at the beginning of the measurement the EPM was positive, but as the measurement wore on, the EPM became negative, indicating a charge reversal. It is important to note that chloride counterions were found to be indifferent to ZnS particle surfaces . It was observed elsewhere that charge reversal can occur in organic solvents in the presence of sufficient indifferent monovalent ion concentrations .…”

Section: Methodsmentioning

confidence: 88%

“…Uncoated ZnS nanoparticles prepared in water have positive electrophoretic mobility (EPM) in the absence of electrolyte, at pH values smaller than 5 . Also, it was found that EPM is not affected by the presence or absence of oxygen.…”

Section: Introductionmentioning

confidence: 98%

“…Also, it was found that EPM is not affected by the presence or absence of oxygen. Nanoparticle stability can be altered through the addition of salts. − Various researchers have explored the effects of particle aggregation on PL nanoparticles. One group found that, after shaking a suspension of uncoated CdSe quantum dots, their band gap increased, and the maximum PL both increased and blue-shifted .…”

Section: Introductionmentioning

confidence: 99%

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Characterization of ZnS Nanoparticle Aggregation using Photoluminescence

Jassby

Wiesner

2011

Langmuir

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Aggregation of uncoated ZnS nanoparticles was determined to have an unexpected impact on the particle's photoluminescent properties. Aggregation had significant consequences to both band-edge and trap-site photoluminescence, increasing the former and decreasing the latter. The onset of changes to photoluminescence was influenced by aggregation rate. Results suggest that aggregate structure plays an important role in determining the extent to which changes to photoluminescence occur. Strong evidence is presented in support of the hypothesis that aggregation-induced changes to surface tension are responsible for the observed photoluminescence behavior. We show that changes in photoluminescence can be used to predict the attachment coefficient, in lieu of dynamic light scattering. Additionally, our data indicate that the particle size distribution of aggregating ZnS nanoparticles is invariant across electrolyte concentrations, at a given standard deviation away from the maximum rate of photoluminescence change.

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Section: Methodsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Characterization of ZnS Nanoparticle Aggregation using Photoluminescence

Jassby

Wiesner

2011

Langmuir

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“…Spherical zinc sulfide particles were synthesized according to the method proposed by Wilhelmy and Matijević (24); their detailed chemical and morphological analysis can also be found in (25,26). TEM pictures (Zeiss DSM 950 SEM, Germany) of the particles demonstrated their sphericity and yielded an average diameter of 320 Ϯ 20 nm (Fig.…”

Section: Methodsmentioning

confidence: 99%

Deposition of Colloidal Zinc Sulfide on Glass Substrate

Durán

Ontiveros-Ortega

Chibowski

et al. 1999

Journal of Colloid and Interface Science

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“…For pH >2, the agglomeration of the particles increases, particularly at pH 4, which is near the isoelectric point of ZnS, which is in the pH range 3-5.5, depending on the chemical conditions during the synthesis. 14,34 In the pH range 2-6, the size of the particles remains constant (20-40 nm), except for particles synthesized from the acetate system at pH >4, where the particles within the agglomerates are up to 70 nm in size. This behavior is accounted for by the theoretical calculations that show the decrease in the amount of triacetato complexes in the solution from 100% to ∼45% for pH >3 (Fig.…”

Section: (4) Influence Of Ph On the Precipitation Processesmentioning

confidence: 99%

Synthesis of Controlled Spherical Zinc Sulfide Particles by Precipitation from Homogeneous Solutions

Vacassy

Scholz

Dutta

et al. 1998

Journal of the American Ceramic Society

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Zinc sulfide (ZnS) powders have been obtained by precipitation from homogeneous solutions of various zinc salt compounds, with S 2− as precipitating anion, formed by decomposition of thioacetamide. Spherical particles with a very narrow size distribution can be obtained by controlling the synthesis parameters. The particle sizes are influenced by the nature of the associated anion. For example, nanometer-sized ZnS particles are formed using acetate or acetylacetonate anions under acidic pH conditions, controlled by the addition of acetic acid. Although the nucleation is accelerated by the use of acetic acid, limited particle growth occurs because of the formation of complexes with zinc cations that lowers the concentration of free cations in the solution. Also, the complexing-attachment phenomena of the ZnS particles with acetate and acetylacetonate anions lead to the arrest of particle growth processes. The presence of complexed Zn 2+ species in the acidic solution is demonstrated both theoretically, using a model based on the calculations of the solubility isotherms of the soluble species, and by Fourier-transform infrared techniques. The nanostructured ZnS particles may provide a suitable semiconductor nanocluster material for optoelectronic applications as well as a phosphor suitable for application in flatpanel display technology.

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Electrokinetic properties of monodisperse colloidal dispersions of zinc sulfide

Cited by 4 publications

References 11 publications

Characterization of ZnS Nanoparticle Aggregation using Photoluminescence

Characterization of ZnS Nanoparticle Aggregation using Photoluminescence

Deposition of Colloidal Zinc Sulfide on Glass Substrate

Synthesis of Controlled Spherical Zinc Sulfide Particles by Precipitation from Homogeneous Solutions

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