Nanodispersed cobalt particles in a thermolysed poly(acrylonitrile) matrix

Bronstein, Lyudmila M.; Mirzoeva, E. S.; Valetsky, Pjotr M.; Солодовников, С. П.; Register, Richard A.

doi:10.1039/jm9950501197

Cited by 32 publications

(21 citation statements)

References 9 publications

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“…The stability of the resulting metal colloidal particles will be ensured by embedding them in the body of hydrogel. A variety of methods for metal colloid formation and stabilization exists, including formation of metal nanoparticles in polymer films, − gels, , microemulsions, , polymer solutions, , etc. A promising approach dealing with the formation of metal particles in amphiphilic block copolymer micelles has been recently proposed quite simultaneously in some research groups including ours. − The well-characterized amphiphilic block copolymers of polystyrene (PS) and poly(4-vinylpyridine) (P4VP) formed micelles with a P4VP core in organic solvents, such as toluene and THF. , The cores of these micelles intensively absorbed metal ions, stabilizing and controlling the size of metal colloids which were obtained upon reduction of the metal ions.…”

Section: Introductionmentioning

confidence: 99%

Complexes of Polyelectrolyte Gels with Oppositely Charged Surfactants: Interaction with Metal Ions and Metal Nanoparticle Formation

Bronstein¹,

Platonova²,

Yakunin³

et al. 1998

Langmuir

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The interaction of polyelectrolyte gel/oppositely charged surfactant complexes with AgNO3 and H2PtCl6 was investigated. Three kinds of gel/surfactant complexes were studied: a complex of the anionic gel of poly(methacrylic acid) with the cationic surfactant cetylpyridinium chloride and complexes of the cationic gel of poly(diallyldimethylammonium chloride) with two anionic surfactants: sodium dodecyl sulfate and sodium dodecylbenzenesulfonate. After reduction of metal compounds by hydrazine−hydrate, sodium borohydride, or UV-irradiation, Pt and Ag metal particles embedded in the body of the hydrogel were formed. The degree of metal ion exchange was higher for the oppositely charged metal ion and the polyelectrolyte gel; i.e., Ag+ is strongly absorbed by the complex poly(methacrylic acid)/cationic surfactant, while PtCl6 2- ions are mainly consumed by the complex of poly(diallyldimethylammonium chloride) gel with anionic surfactants. Small-angle X-ray scattering data indicated different structural changes in the gel for the complex of an anionic gel with cationic surfactant and for complexes of cationic gel with anionic surfactants. The incorporation of the metal ions in the body of the hydrogel and the growth of metal nanoparticles was found to lead to the loss of order provided by surfactant aggregates if the distance between charged groups in the polyelectrolyte does not provide a strong hydrophobic interaction between surfactant molecules.

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Section: Introductionmentioning

confidence: 99%

Complexes of Polyelectrolyte Gels with Oppositely Charged Surfactants: Interaction with Metal Ions and Metal Nanoparticle Formation

Bronstein¹,

Platonova²,

Yakunin³

et al. 1998

Langmuir

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“…The most recent work is by Register and his group. 31 They have demonstrated the formation of 10 nm b -Co particles in a polymeric matrix. The method was thermolyzing films of poly(acrylonitrile) containing homogeneously distributed [Co(dimethylformamide) 6 12 ] [Co(CO) 4 2 ] 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The method was thermolyzing films of poly(acrylonitrile) containing homogeneously distributed [Co(dimethylformamide) 6 12 ] [Co(CO) 4 2 ] 2 . The size of the cobalt particles can be controlled 31 by varying the thermolysis condition and the loading of cobalt in the films prior to thermolysis.…”

Section: Introductionmentioning

confidence: 99%

The preparation of metal-polymer composite materials using ultrasound radiation

et al. 1998

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“…The increase of the thermolysis temperature from 220°C to 300°C results in the growth of signal intensity and linewidth [12]. The increase in signal intensity with increasing thermolysis temperature suggests that very small particles (<1 nm), which do not contribute to the FMR signal, are formed at low thermolysis temperatures.…”

Section: Nanodispersed Metal Particles In Thermolyzed Pan-imentioning

confidence: 96%

“…Another approach to producing polymeric materials with nanodispersed metal particles is blending organometallic compounds with polymers [12]. This approach is adaptable to any polymeric matrices since polymers need not contain active groups, although miscibility between components of the blend limits this method.…”

Section: Preparation Of Metal Particles Through Blending Organometallmentioning

confidence: 99%

Nanodispersed Metal Particles in Polymeric Matrices

Bronstein

Mirzoeva

Seregina

et al. 1996

ACS Symposium Series

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Three routes to the preparation of nanodispersed metal or metal oxides particles in polymer matrices have been studied. Thermal treatment in air of W-, Mo-and Cr-carbonyl complexes with polyacrylonitrile (PAN) results in the formation of nanometer-size metal oxide particles in a polycyclic polymer. Co-containing polymers were prepared by mixing Co 2 (CO) 8 with a PAN copolymer or an aromatic polyamide in dimethylformamide (DMF). Co 2 (CO) 8 interacts with DMF giving the complex [Co(DMF) 6 ] 2+ [Co(CO) 4 ] -2 . Subsequent thermolysis converts this complex to nanodispersed Co particles. By ferromagnetic resonance and small-angle x-ray scattering, it was found that the average Co particle size depends on the type of polymeric matrix, the thermolysis conditions and the Co loading and varies from 1 to 10 nm.Colloidal metal particles and metal clusters are intriguing because their behavior differs from both bulk metal and isolated metal atoms. The huge specific surface and confinement of charge carriers suggests potential applications as catalysts, as ferrofluids, and as materials for third- harmonic generation (1,2), The principal difficulty in preparing such metal colloids is developing a method to control the particle growth. This problem can be partly solved by carrying out the nucleation and growth process either in solid polymer matrices (3) or in cages (or pores, for example, zeolites) (4) or in organized media such as microemulsions, vesicles or micelles (5). Reactions in such microreactors work with the concept that growth processes are limited in nanostructured matrices by the size of the structures themselves. Here, we discuss another way to control the nucleation and growth process in polymeric matrices which might be especially appealing when the methods listed above cannot be applied, that is, when the polymeric matrix does not form vesicles or micelles. For this case, carrying out the metal colloid formation in solid polymeric matrices can provide size control by changing the type of polymeric matrix, complexation power

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Nanodispersed cobalt particles in a thermolysed poly(acrylonitrile) matrix

Cited by 32 publications

References 9 publications

Complexes of Polyelectrolyte Gels with Oppositely Charged Surfactants: Interaction with Metal Ions and Metal Nanoparticle Formation

Complexes of Polyelectrolyte Gels with Oppositely Charged Surfactants: Interaction with Metal Ions and Metal Nanoparticle Formation

The preparation of metal-polymer composite materials using ultrasound radiation

Nanodispersed Metal Particles in Polymeric Matrices

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