An Fe(CO)<sub>5</sub>‐Thermolysis‐Based Process for the Preparation of Polymer@Iron Composite Powders with High Corrosion Resistance

Nesher, Guy; Marom, G.; Avnir, David

doi:10.1002/ejic.201200086

Cited by 7 publications

(10 citation statements)

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“…It has become possible to incorporate CH within Ag by the use of a recent, wide-scope materials methodology for the entrapment of organic molecules and polymers within metals. [8][9][10][11][12] Many applications-practically all across chemistry-have been demonstrated. [13][14][15][16][17][18][19] In brief, the entrapment process involves a room temperature metal synthesis by chemical reduction of the metal cation, in either aqueous 8 or organic phases, 16 with either a homogenous 8 (solvent-soluble) or heterogeneous 9,10 (solvent-insoluble) reducing agent, carried out in the presence of the desired organic dopant molecule.…”

Section: Introductionmentioning

confidence: 99%

Bioactive doped metals: high synergism in the bactericidal activity of chlorhexidine@silver towards wound pathogenic bacteria

2013

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The entrapment of chlorhexidine (CH) within metallic silver (CH@Ag) results in a composite material bearing powerful synergetic bactericidal action towards two opportunistic wound pathogenic bacteria, the Gram-negative Pseudomonas aeruginosa and the Gram-positive Staphylococcus epidermidis. TEM and STEM imaging revealed morphological abnormalities in bacteria exposed to the composite. Release profiles of the active ingredients, CH and ionic silver, from the composite were evaluated by UV spectroscopy and by ICP-MS elemental analysis, and indicated that the strong bactericidal effects were associated with their co-release and presence in the solution. The use of both powder form and pressed form of CH@Ag provides means to control the release kinetics of entrapped CH from the composite and demonstrates the potential application of such composites in wound treatments.

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Section: Introductionmentioning

confidence: 99%

Bioactive doped metals: high synergism in the bactericidal activity of chlorhexidine@silver towards wound pathogenic bacteria

2013

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“…The problem is that reduction procedures for such cations maybe too harsh for the dopant. The approach for this case was therefore different: to start with metallic precursors that are already at zero oxidation level . This nonreductive method was used for the entrapment of several polymers in iron by the solution thermolysis of Fe(CO) 5 , leading to highly corrosion resistant iron (section ).…”

Section: The Methodologymentioning

confidence: 99%

Molecularly Doped Metals

Avnir

2013

Acc. Chem. Res.

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The many millions of organic, inorganic, and bioorganic molecules represent a very rich library of chemical, biological, and physical properties that do not show up among the approximately 100 metals. The ability to imbue metals with any of these molecular properties would open up tremendous potential for the development of new materials. In addition to their traditional features and their traditional applications, metals would have new traits, which would merge their classical virtues such as conductivity and catalytic activity with the diverse properties of these molecules. In this Account, we describe a new materials methodology, which enables, for the first time, the incorporation and entrapment of small organic molecules, polymers, and biomolecules within metals. These new materials are denoted dopant@metal. The creation of dopant@metal yields new properties that are more than or different from the sum of the individual properties of the two components. So far we have developed methods for the doping of silver, copper, gold, iron, palladium, platinum, and some of their alloys, as well as Hg-Ag amalgams. We have successfully altered classical metal properties (such as conductivity), induced unorthodox properties (such as rendering a metal acidic or basic), used metals as heterogeneous matrices for homogeneous catalysts, and formed new metallic catalysts such as metals doped with organometallic complexes. In addition, we have created materials that straddle the border between polymers and metals, we have entrapped enzymes to form bioactive metals, we have induced chirality within metals, we have made corrosion-resistant iron, we formed efficient biocidal materials, and we demonstrated a new concept for batteries. We have developed a variety of methods for synthesizing dopant@metals including aqueous homogeneous and heterogeneous reductions of the metal cations, reductions in DMF, electrochemical entrapments, thermal decompositions of zerovalent metal carbonyls, and dissolution during amalgam formation. The structures of these dopant@metal materials indicate that metals entrap the organic molecules within their agglomerated nanocrystals. As a result, these materials are porous, making the dopant accessible for chemical reactions, in particular for catalysis. We have prepared these materials in a variety of forms, including powder, granules, pressed discs, thin films, thick films, sub-micrometer particles, and nanometric particles decorating ceramic nanofibers. Entrapment and adsorption are very different processes. If entrapped, water-soluble molecules cannot be extracted, but the same molecules, if adsorbed, are easily washed away. Likewise, most of the special properties that we have observed, such as major improvements or changes in catalytic activity, completely different thermal gravimetric analysis behavior, and more, are observed only in the entrapped cases.

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“…Entrapment of organic molecules within metals is a recently developed materials methodology, enabling the creation of a new family of metal-organic composites. [1][2][3][4][5][6][7][8][9][10][11][12] These composites, denoted dopant@metal, contain an organic component in the range of 0.2% to 10% w/w, a sufficient amount to induce unique properties in the resulting material. Formation of metals that show enantioselective optical activity, 5 acidic silver composites, 6 composites with improved catalytic ability compared with both the entrapped molecule and the metal alone, 7 reduced electrical conductivity by the introduction of polymeric nanophases, 9 bioactive enzyme-metal composites, 10 highly efficient bactericidal activity 11 and the construction of an electrochemical cell based on same-metal electrodes one of which is doped 12 are some of the examples.…”

Section: Introductionmentioning

confidence: 99%

“…The reduction processes used, which stand for the main difference between the entrapment methods, are as follows: one method uses a soluble reducing agent, making the whole process homogeneous; 1 a second method involves a sacrificial metal as the reducing agent, and is therefore a heterogeneous process; 2 a third method uses the solvent (DMF) as a reducing agent; 3 and a fourth method involves the electrochemical reduction of the metal cations. 4 The existence of several entrapment methods made it possible to dope different metals such as silver, 1-4,5a,6,7,9-12 gold, 2,5a,10 copper, 2,4 palladium, 5b and iron, 8 and enabled the use of a variety of dopants ranging from small molecules such as dyes, amino acids, inorganic compounds, and up to large molecules such as polymers (both hydrophobic and hydrophilic), proteins and carbon nanofibers.…”

Section: Introductionmentioning

confidence: 99%

Entrapment of organic molecules within binary metal alloys

Ben-Efraim

Avnir

2012

J. Mater. Chem.

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Within metallic materials, alloys form the largest and richest family. We describe here a method for extending the properties of alloys even further, namely by incorporating organic compounds within bimetallic alloys, thus forming three-component organic-metallic composite-alloys of a novel type. Specifically, thionin and neutral red were entrapped in the following bimetallic systems: Ag-Au, Cu-Pt and Cu-Pd. This was achieved by zinc co-reduction of the two metal salts in the presence of the dye molecule to be entrapped. It was found that the two metals in each composite formed a bimetallic alloy, and that the entrapment yields were 95% and above in most composites. Using alloys as entrapping metallic matrices allows for the preparation of a wide variety of metal-organic composites of potential use in fields such as catalysis and sensing.

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An Fe(CO)₅‐Thermolysis‐Based Process for the Preparation of Polymer@Iron Composite Powders with High Corrosion Resistance

Abstract: A new method for the preparation of metal-polymer composite materials is described. This new approach of doping of metals is based on the thermolysis of a zero-valent complex. Specifically, several polymer@Fe-composite powders were[a]

Cited by 7 publications

References 40 publications

Bioactive doped metals: high synergism in the bactericidal activity of chlorhexidine@silver towards wound pathogenic bacteria

Bioactive doped metals: high synergism in the bactericidal activity of chlorhexidine@silver towards wound pathogenic bacteria

Molecularly Doped Metals

Entrapment of organic molecules within binary metal alloys

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An Fe(CO)5‐Thermolysis‐Based Process for the Preparation of Polymer@Iron Composite Powders with High Corrosion Resistance

Abstract: A new method for the preparation of metal-polymer composite materials is described. This new approach of doping of metals is based on the thermolysis of a zero-valent complex. Specifically, several polymer@Fe-composite powders were[a]

Cited by 7 publications

References 40 publications

Bioactive doped metals: high synergism in the bactericidal activity of chlorhexidine@silver towards wound pathogenic bacteria

Bioactive doped metals: high synergism in the bactericidal activity of chlorhexidine@silver towards wound pathogenic bacteria

Molecularly Doped Metals

Entrapment of organic molecules within binary metal alloys

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Product

Resources

About

An Fe(CO)₅‐Thermolysis‐Based Process for the Preparation of Polymer@Iron Composite Powders with High Corrosion Resistance