Turning “on” and “off” nucleation and growth: Microwave assisted synthesis of CdS clusters and nanoparticles

Ferrer, Edmy; Nater, Sariann; Rivera, Daniel; Colon, Jean Marie; Zayas, Francisco; González, Miguel A.; Castro, Miguel E.

doi:10.1016/j.materresbull.2011.02.019

Cited by 15 publications

(8 citation statements)

References 32 publications

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“…In addition to the solvents of water, polyols, and ionic liquids that have been discussed above, many other solvents have also been investigated for the microwave-assisted preparation of inorganic nanostructures, which have greatly widened the applications of microwave heating in the preparation of nanostructured materials. A variety of organic solvents have been adopted for the microwave-assisted preparation of inorganic nanostructures, such as alcohols, − ethylene glycol monoalkyl ethers, propylene carbonate, ethylenediamine, ,− PEG with low molecular weights, − methacrylate, DMF, ,− trioctylphosphine, nonadecane, octyl ether, dimethyl sulfoxide, acetonitrile, tetrahydrofuran, formaldehyde, cyclohexanone, hexadecylamine, , diethanolamine, oleylamine, − 1,2-dichlorobenzene, toluene, and pyridine . Various ino...…”

Section: Microwave-assisted Preparation Of Nanostructures In Other So...mentioning

confidence: 99%

“…A variety of organic solvents have been adopted for the microwave-assisted preparation of inorganic nanostructures, such as alcohols, − ethylene glycol monoalkyl ethers, propylene carbonate, ethylenediamine, ,− PEG with low molecular weights, − methacrylate, DMF, ,− trioctylphosphine, nonadecane, octyl ether, dimethyl sulfoxide, acetonitrile, tetrahydrofuran, formaldehyde, cyclohexanone, hexadecylamine, , diethanolamine, oleylamine, − 1,2-dichlorobenzene, toluene, and pyridine . Various inorganic nanostructures have been prepared by the microwave-assisted method in the above-mentioned solvents, and these nanostructures include Au, Ag, ,,,…”

Section: Microwave-assisted Preparation Of Nanostructures In Other So...mentioning

confidence: 99%

“…Other solvents have also been used in the microwave-assisted synthesis of nanostructured metal chalcogenides. Ferrer et al reported turning “on” and “off” nucleation and growth of CdS clusters and nanoparticles with diameters ranging from 1.6 to over 250 nm from the microwave-assisted reaction of Cd(CH 3 COO) 2 with dimethyl sulfoxide. Dimethyl sulfoxide acted as the solvent and a source of sulfide ions.…”

Section: Microwave-assisted Preparation Of Nanostructures In Other So...mentioning

confidence: 99%

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Microwave-Assisted Preparation of Inorganic Nanostructures in Liquid Phase

2014

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Section: Microwave-assisted Preparation Of Nanostructures In Other So...mentioning

confidence: 99%

Section: Microwave-assisted Preparation Of Nanostructures In Other So...mentioning

confidence: 99%

Section: Microwave-assisted Preparation Of Nanostructures In Other So...mentioning

confidence: 99%

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Microwave-Assisted Preparation of Inorganic Nanostructures in Liquid Phase

2014

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“…These variations include the use of reducing agents [12], stabilizing agents [13], reaction medium [14], pH control [15], reaction temperature [16], among others. Gold nanoparticles are obtained mainly by a conventional heating method and microwave synthesis [17], being the latter the most studied in recent years, due to short synthesis times and small amounts of reagent. The synthesis conditions influence the particle size and therefore the SPR.…”

Section: Introductionmentioning

confidence: 99%

Preparation, optical characterization and stability of gold nanoparticles by facile methods

2019

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The influence of synthesis method, cycles quantity and sonication time in the gold nanoparticles size and plasmon resonance were analyzed to establish the synthesis with smaller nanoparticle size and higher absorbance. Gold nanoparticles were analyzed by UV-Vis spectrophotometry, dynamic light scattering (DLS) and surface electron microscopy (SEM). The results indicate that the nanoparticles obtained by microwave have bigger size but higher absorption. These nanoparticles were analyzed one year after its synthesis and it was found that the plasmon resonance signal remains almost unchanged. Finally, two equation were derived from the analyzes for estimate molar extinction coefficient, molar concentration and nanoparticle average diameter.

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“…In this work, we report the effect of CaS dispersions on the viability of human skin melanoma and benign cells. In a previous work from our group, the dissociation of calcium sulfide in acidic environments was explored experimentally as a potential strategy to selectively reduce the proliferation of human breast cancer cells in vitro [ 11 , 12 ]. The standard Gibbs free energies of formation of the relevant chemicals are summarized in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

pH-Selective Reactions to Selectively Reduce Cancer Cell Proliferation: Effect of CaS Nanostructures in Human Skin Melanoma and Benign Fibroblasts

Martínez

Ramos

Acevedo

et al. 2023

BioChem

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An acidic extracellular pH value (pHe) is characteristic of many cancers, in contrast to the physiologic pHe found in most benign cells. This difference in pH offers a unique opportunity to design and engineer chemicals that can be employed for pH-selective reactions in the extracellular fluid of cancer cells. The viability of human skin melanoma and corresponding fibroblasts exposed to CaS dispersions is reported. The viability of melanoma cells decreases with CaS dispersion concentration and reaches 57% at 3%, a value easily distinguishable from melanoma control experiments. In contrast, the viability of benign fibroblasts remains nearly constant within experimental error over the range of dispersion concentrations studied. The CaS dispersions facilitate vinculin delocalization in the cytoplasmic fluid, a result consistent with improved focal adhesion kinase (FAK) regulation in melanoma cells. Thermodynamic considerations are consistent with the formation of H2S from CaS in the presence of protons. The thermodynamic prediction is verified in independent experiments with solid CaS and acidic aqueous solutions. The amount of H2S formed decreases with pH. An activation energy for the process of (30 ± 10) kJ/mol in the temperature range of 280 to 330 K is estimated from initial rate measurements as a function of temperature. The total Gibbs energy minimization approach was employed to establish the distribution of sulfides—including H2S in the gas and aqueous phases—from the dissociation of CaS as a function of pH to mimic physiologically relevant pH values. Theoretical calculations suggest that partially protonated CaS in solution can be stable until the sulfur atom bonds to two hydrogen atoms, resulting in the formation of Ca2+ and H2S, which can be solvated and/or released to the gas phase. Our results are consistent with a model in which CaS is dissociated in the extracellular fluid of melanoma cells selectively. The results are discussed in the context of the potential biomedical applications of CaS dispersions in cancer therapies.

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Turning “on” and “off” nucleation and growth: Microwave assisted synthesis of CdS clusters and nanoparticles

Cited by 15 publications

References 32 publications

Microwave-Assisted Preparation of Inorganic Nanostructures in Liquid Phase

Microwave-Assisted Preparation of Inorganic Nanostructures in Liquid Phase

Preparation, optical characterization and stability of gold nanoparticles by facile methods

pH-Selective Reactions to Selectively Reduce Cancer Cell Proliferation: Effect of CaS Nanostructures in Human Skin Melanoma and Benign Fibroblasts

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