Size tailoring of silver colloids by reduction in microemulsions

Barnickel, P.; Wokaun, Alexander; Sager, W.F.C.; Eicke, Hans‐Friedrich

doi:10.1016/0021-9797(92)90116-4

Cited by 132 publications

(96 citation statements)

References 27 publications

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“…This has led to studies by Kurihara et al [60] on laser and pulse radiolytically induced colloidal gold formation in w/o microemulsions. Colloidal gold and silver particles have also been synthesized by reduction of corresponding metal salts in water-in-oil microemulsions using sodium borohydride [61,62].…”

Section: Particle Synthesis In Microemulsionsmentioning

confidence: 99%

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Pillai

Kumar

Hou

et al. 1995

Advances in Colloid and Interface Science

249

121

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Section: Particle Synthesis In Microemulsionsmentioning

confidence: 99%

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Pillai

Kumar

Hou

et al. 1995

Advances in Colloid and Interface Science

249

121

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“…They can provide a nano-sized reaction room, 2 sometimes entitled reverse micellar microreactors. 3 Reversed micelles have been widely studied concerning enzyme activity, [4][5][6] the solubilization mechanism of protein, 7 conformational changes of protein, 8 the synthesis of nanoparticles, [9][10][11][12] and so on. Nanoparticle probes, compared with organic dyes acting as biosensors in chemical and biochemical fields, have been researched recently and their application is becoming more extensive.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of Bovine Serum Albumin in Reversed Micelles by CdS Nanoparticles

et al. 2004

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Since 1980's, reversed micelles, as a mimetic membrane system, 1 have attracted the increasing interest of chemists and biologists. They can provide a nano-sized reaction room, 2 sometimes entitled reverse micellar microreactors. 3 Reversed micelles have been widely studied concerning enzyme activity, [4][5][6] the solubilization mechanism of protein, 7 conformational changes of protein, 8 the synthesis of nanoparticles, 9-12 and so on. Nanoparticle probes, compared with organic dyes acting as biosensors in chemical and biochemical fields, have been researched recently and their application is becoming more extensive. Three types of nanoparticles in biochemical analysis are used: metal nanoparticles, 13 silica nanoparticles, 14,15 and luminescence quantum dot. 16,17 These probes have been applied to the ultrasensitive detection of proteins, DNA sequencing, clinical diagnostics, etc. In the case of in vivo studies, the nanoparticles will possibly affect the tissues or cells of an organism. For example, Cd 2+ and S 2-are component parts of a quantum dot. Also, as we know, the two ions are harmful to the human body. By researching the interaction of CdS nanoparticles with BSA in reversed micelles, the effect of CdS to protein in real cells can be simulated.In this work, the effects of the microenvironment induced by reversed micelles on the fluorescence spectra of BSA were investigated. The focus of this work was researching the effects of neutral and charged CdS nanoparticles on BSA-fluorescence quenching in reversed micelles. The quenching may be the result of energy transfer between BSA and CdS nanoparticles. A quenching equation according to the static quenching model and the quenching constant was obtained. Experimental ApparatusFluorescence and UV spectra were measured on a Hitachi F-4500 fluorescence spectrophotometer and a TU-1221 PUXI General UV-VIS spectrophotometer, respectively. ReagentsAll chemicals were analytical-grade regents. Doubly distilled water via a double-distillation quartz set was used throughout.Bovine serum albumin (BSA), purchased from LiZhu DongFeng Biotechnology, Co. LTD. (Shanghai, China), was used without further purification. A stock solution of BSA at a concentration of 30 mg ml -1 was prepared using water and stored at 4˚C prior to use. A cetyltrimethylammonium bromide (CTAB) solution (0.05 mol L -1 ) was prepared by dissolving an appropriate amount of CTAB into 500 ml of 1-butanol-cyclohexane mixture (v/v = 1/9), where 1-butanol acted as a co-surfactant. ProcedureAppropriate quantities of BSA aqueous solution and water were transferred to a small flask using a microsyringe, followed by adding a CTAB organic solution to a total volume of 10.00 ml. The water content, ω (= [H2O]/[CTAB]), was adjusted by changing the volume of water at a fixed BSA concentration in reversed micelles. A blank system was prepared similarly, but by replacing the BSA solution with water of the same volume. Both the BSA-H2O-CTAB mixtures and the blank were ultrasonicated for 5 min until the micellar suspen...

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“…For example, the C 12 E 4 (Brij 30)/n-heptane/water mi-croemulsions containing only H 2 PtCl 6 showed strong changes in the spectra when they were exposed to daylight for several days at elevated temperatures [16]. It should be mentioned that Barnickel et al [17] have also synthesized silver colloids in C 12 E 5 /cyclohexane/water microemulsions only using daylight irradiation of the AgNO 3 dissolved in this system. They explained their results, assuming that the terminal hydroxyl groups of the C 12 E 5 surfactant, which are oriented toward the inner part of the droplets, are capable of reducing Ag + ions upon radiation.…”

Section: Introductionmentioning

confidence: 92%

Miniemulsion Polymerization of Styrene Initiated by Tween-surfinit

Capek

2010

Designed Monomers and Polymers

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The sterically-stabilized miniemulsion polymerization of styrene initiated by peroxide-containing Tweens (Tw per , surfinit) was investigated. The conversion curves for miniemulsion emulsion polymerization are concave downward throughout the polymerization and the observed limiting conversions are much below 100% conversion. The polymerization rate vs conversion curve is described by a curve with two rate intervals and rate maximum located at low conversion. The consumption of peroxide groups in Tween (Tw per ), including their immobilization and accumulation into micelles, leads to the dead-end polymerization. The maximal polymerization rate increases with increasing the emulsifier and peroxide concentrations. The particle size decreases and the number of particles increases with increasing the concentration of emulsifier, Tw per and reducing agent. The increased stability of the polymer dispersions is attributed to the chemically bound moieties of Tw per to the particle surface. The values of the ratio of the final number of polymer particles to the initial number of monomer droplets (N p /N d ) favor the mixed mode of particle nucleation.

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Size tailoring of silver colloids by reduction in microemulsions

Cited by 132 publications

References 27 publications

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Fluorescence Quenching of Bovine Serum Albumin in Reversed Micelles by CdS Nanoparticles

Miniemulsion Polymerization of Styrene Initiated by Tween-surfinit

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