Polyester Preparation in the Presence of Pristine and Phosphonic‐Acid‐Modified Zirconia Nanopowders

Svehla, Jakob; Pabisch, Silvia; Feichtenschlager, Bernhard; Holzmann, Dietmar; Peterlik, Herwig; Kickelbick, Guido

doi:10.1002/mame.201100191

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…PAs have recently proven to be useful coupling molecules for the tuning of organic-inorganic and inorganic-inorganic interfaces in (nano)composite materials, in order to improve, for instance, their mechanical properties, [193][194][195][196] optical properties (transparency, refractive index), 51,193,197,198 or thermal conductance. 195,198 In addition, PA coupling molecules may also improve flame retardancy of nanocomposites with a polymer matrix.…”

Section: Composite Materialsmentioning

confidence: 99%

“…202 PAs have also been used to covalently bind the polymer chains to the metal oxide. 51,194 Thus, Tchoul et al applied this strategy 205 to the preparation of a dielectric nanocomposite composed of TiO 2 with a covalently grafted polystyrene corona using TiO 2 nanoparticles grafted by an azide-terminated phosphonate monolayer, which were then covalently attached to the polystyrene chains by "click" chemistry.…”

Section: Composite Materialsmentioning

confidence: 99%

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Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials

et al. 2013

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Phosphonic acids are increasingly being used for controlling surface and interface properties in hybrid or composite materials, (opto)electronic devices and in the synthesis of nanomaterials. In this perspective article, a concise survey of phosphonate coupling molecules is first presented, including details on their coordination chemistry, their use in the surface modification of inorganic substrates with self-assembled monolayers, and the analytical techniques available to characterize their environment in nanomaterials. Then, some of their recent applications in the development of organic electronic devices, photovoltaic cells, biomaterials, biosensors, supported catalysts and sorbents, corrosion inhibitors, and nanostructured composite materials, are presented. In the last part of the article, a brief overview of recent progress in the use of phosphonate ligands for the preparation of molecular nanomaterials like metal organic frameworks and functionalized polyoxometalates is given.

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Section: Composite Materialsmentioning

confidence: 99%

Section: Composite Materialsmentioning

confidence: 99%

Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials

et al. 2013

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“…The surface functionalization for powder has been studied for metal oxides and the most common method consists of grafting carboxylate or phosphate , by mixing the nanopowder with the ligand-solvent solution, then sonicating (from 10 to 60 min) followed by stirring at room temperature for an extended time (3–5 days). , Since such a protocol is not favorable for metal boride nanopowders because they do not yield stable inks, we developed a general route to functionalize the surface of Ni 3 B NCs and form stable colloidal suspensions (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Nickel Boride (Ni_xB) Nanocrystals: From Solid-State Synthesis to Highly Colloidally Stable Inks

et al. 2023

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Metal borides, a class of materials intensively used in industry as superconductors, magnetic materials, or hot cathodes, remain largely unexplored at the nanoscale mainly due to the difficulty in synthesizing single-phase nanocrystals. Recent works have shown that synthetic methods at lower temperatures (<400 °C) yield amorphous polydisperse nanoparticles, while phase purity is an issue at higher temperatures. Among all the metal-rich borides, nickel borides (Ni x B) could be a potential catalyst for a broad range of applications (hydrogenations, electrochemical hydrogen, and oxygen evolution reactions) under challenging conditions (such as high pH or high temperatures). Here, we report a novel solid-state method to synthesize Ni x B nanopowders (with a diameter of approximately 45 nm) and their conversion into colloidal suspensions (inks) through treatment of the nanocrystal surface. For the solid-state synthesis, we used commercially available salts and explored the reaction between the Ni and B sources while varying the synthetic parameters under mild and solvent-free reaction conditions. We show that pure phase Ni3B and Ni2B NCs can be obtained with high yield in the pure phase using as precursors NiCl2 and Ni, respectively. Through extensive mechanistic studies, we show that Ni nanoclusters (1–2 nm) are an intermediate in the boriding process, while the metal co-reactant lowers the decomposition temperature of NaBH4 (used as a reducing agent and B source). Size control can instead be exerted through reaction mediators, as seen from the differential nucleation and growth of Ni (clusters) or Ni x B NCs when employing L- (amine, phosphine) and X-type (carboxylate) mediators. Applying surface engineering methods to our Ni x B NCs, we stabilized them with inorganic (NOBF4) or organic (borane tert-butyl amine, oleylamine) ligands in the appropriate solvent (DMSO, hexane). With this method, we produce stable inks for further solution processing applications. Our results provide tools for further development of catalysts based on Ni x B NCs and pave the way for synthesizing other metal boride colloidal nanostructures.

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“…Acidic properties of sulfated zirconia are related to the coordinated unsaturated Zr 4+ cations of its surface which show a high ability for accepting electron. The closer charge‐withdrawing SO 4 2− groups, the more electron acceptance . For SZ, Yamaguchi proposed an organic sulfate structure with cations of zirconium acting as the Lewis sites, in which two covalent SO bonds are presented ( Figure a).…”

Section: Introductionmentioning

confidence: 99%

Effect of the Sulfated Zirconia Nanostructure Characteristics on Physicochemical and Electrochemical Properties of SPEEK Nanocomposite Membranes for PEM Fuel Cell Applications

Mossayebi

Parnian

Rowshanzamir

2018

Macro Materials & Eng

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/mame.201700570. Sulfated Zirconia FillersThis study expresses that the characteristics of sulfated zirconia (SZ) nanostructure in sulfonated poly(ether ether ketone) (SPEEK)-based membranes is the key to optimize their properties for fuel cell applications. Two types of SZ treating in different thermal conditions are produced by precipitation and analyzed by X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, energy-dispersive X-ray analysis, and transmission electron microscopy. Sulfate concentration on both types of SZ is changing from 0.54 to 1.45 wt% and thus the SZ samples differ in particle size and sulfate content. The nanocomposite membranes are prepared by incorporating 6 wt% of SZ samples into SPEEK matrix in casting procedure followed by performing electrochemical characterizations and impedance spectroscopy. Moreover, morphology, mechanical, and chemical stability of the membranes are investigated by field emission scanning electron microscopy, stress-strain, and ex situ Fenton's tests. The incorporation of SZ sample having more surface sulfate groups in the SPEEK matrix results in not only excessive oxidative stability and tensile strength but also more acidic sites for ion transport, promoting conductivity. Furthermore, both types of nanocomposite membranes show improved ionic conductivity and water affinity with a lower tendency to swell rather than the plain SPEEK membrane. It is proved that desired consequences of doping SZ into SPEEK matrix can be intensified by changing the physicochemical properties of sulfated zirconia nanoparticles.

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Polyester Preparation in the Presence of Pristine and Phosphonic‐Acid‐Modified Zirconia Nanopowders

Cited by 7 publications

References 46 publications

Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials

Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials

Nickel Boride (Ni_xB) Nanocrystals: From Solid-State Synthesis to Highly Colloidally Stable Inks

Effect of the Sulfated Zirconia Nanostructure Characteristics on Physicochemical and Electrochemical Properties of SPEEK Nanocomposite Membranes for PEM Fuel Cell Applications

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Polyester Preparation in the Presence of Pristine and Phosphonic‐Acid‐Modified Zirconia Nanopowders

Cited by 7 publications

References 46 publications

Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials

Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials

Nickel Boride (NixB) Nanocrystals: From Solid-State Synthesis to Highly Colloidally Stable Inks

Effect of the Sulfated Zirconia Nanostructure Characteristics on Physicochemical and Electrochemical Properties of SPEEK Nanocomposite Membranes for PEM Fuel Cell Applications

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Nickel Boride (Ni_xB) Nanocrystals: From Solid-State Synthesis to Highly Colloidally Stable Inks