Investigation of inorganic cluster–surfactant flocculants for virion sequestration and removal from aqueous media

Nyman, May; Bieker, Jill Marie; Thoma, Steven G.; Trudell, Daniel E.

doi:10.1016/j.jcis.2007.08.015

Cited by 8 publications

(6 citation statements)

References 51 publications

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“…The interaction between POMs and general biological systems also have attracted interest, and it has been demonstrated that biopolymer POM interactions are significant in the gelatin–decavanadate system 163. Such systems provide a simple and efficient way for the development of homogeneous functional bionanocomposites involving naturally occurring polymers, and POMs embedded in cations can be useful agents for interacting with viruses 164. Furthermore, proteins can ligate a remarkable variety of POMs that are formed from the interaction between proteins and molybdates/tungstates;165 the complexation of POMs by human serum albumin166 has been carried out with [H 2 W 12 O 40 ] 6− and [NaP 5 W 30 O 110 ] 14− .…”

Section: Catalytic Applications In Green Chemistry and Energy Systemsmentioning

confidence: 99%

Polyoxometalates: Building Blocks for Functional Nanoscale Systems

2010

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Polyoxometalates (POMs) are a subset of metal oxides that represent a diverse range of molecular clusters with an almost unmatched range of physical properties and the ability to form dynamic structures that can range in size from the nano- to the micrometer scale. Herein we present the very latest developments from synthesis to structure and function of POMs. We discuss the possibilities of creating highly sophisticated functional hierarchical systems with multiple, interdependent, functionalities along with a critical analysis that allows the non-specialist to learn the salient features. We propose and present a "periodic table of polyoxometalate building blocks". We also highlight some of the current issues and challenges that need to be addressed to work towards the design of functional systems based upon POM building blocks and look ahead to possible emerging application areas.

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Section: Catalytic Applications In Green Chemistry and Energy Systemsmentioning

confidence: 99%

Polyoxometalates: Building Blocks for Functional Nanoscale Systems

2010

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“…[163] Solche Systeme bieten einen einfachen und wirkungsvollen Weg zur Entwicklung homogener funktioneller Bionanokomposite, bei denen natürliche Polymere und POMs beteiligt sind, und in Kationen eingebettete POM könnten nützliche Mittel für die Wechselwirkung mit Viren ergeben. [164] Ferner wurde gezeigt, dass Proteine bemerkenswert unterschiedliche Arten von Polyoxometallaten binden können, die bei der Wechselwirkung zwischen Proteinen und Molybdat/Wolframat [165] nierte Oberfläche, auf der die Abstandhalter 20 Mo 9 O 9 -Ringe bilden, die, gemessen anhand der Van-der-Waals-Radien gegenüberliegender O-Atome, einen Durchmesser von etwa 3 aufweisen. Dadurch ist der große innere Hohlraum zugänglich (Abbildung 26).…”

Section: Wasserspaltungunclassified

Polyoxometallate als Bausteine für funktionelle Nanosysteme

2010

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Die Polyoxometallate (POM), eine Untergruppe der Metalloxide, bilden vielfältige Molekülcluster, die nicht nur außerordentlich vielfältige physikalische Eigenschaften zeigen, sondern auch dynamische Strukturen mit Abmessungen vom Nanometer‐ bis zum Mikrometermaßstab bilden können. Hier beschreiben wir die neuesten Entwicklungen von der Synthese bis zur Struktur und Funktion von Polyoxometallaten. Wir diskutieren Wege zur Herstellung höchst differenzierter hierarchischer Systeme mit mehreren voneinander unabhängigen Funktionalitäten und geben eine kritische Analyse, aus der auch nichtspezialisierte Leser die wichtigsten Eigenschaften ersehen können. In diesem Zusammenhang schlagen wir auch ein “Periodensystem der Polyoxometallat‐Baueinheiten” vor. Schließlich beleuchten wir einige aktuelle Herausforderungen beim Design funktioneller Systeme auf der Basis von POM‐Baueinheiten und geben einen Ausblick auf mögliche Anwendungen.

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“…Keggin-type heteropolyacids have remarkable physical and chemical properties, such as high polarizability and surface charge distribution, high acidity, , high solubility in aqueous and nonaqueous solvents, suitable redox potentials for electron and proton transfer/storage, − high miscibility with sol–gel and polymer matrices, − and the ability to form supramolecular complexes with organic compounds. , Applications for these compounds have been developed in a variety of fields, acting as catalyzers, sensors, fuel cells electrolytes, and electrochromic devices. − Some of these Keggin compounds, such as the 12-tungstophosphoric acid (PW 12 O 40 H 3 , HPW), show photochromic and photochemical properties. ,− Recent studies show the possibility of developing organically modified silica (ormosil) photochromic materials with HPW, which might be used for dosimetry in the UV range. − These materials are prepared by sol–gel methods and can be cast as films. Some of the properties relevant for the photochromic response may be tuned, varying the concentration and type of the organic functionalities.…”

Section: Introductionmentioning

confidence: 99%

“…Keggin-type heteropolyacids have remarkable physical and chemical properties, such as high polarizability and surface charge distribution, 1 high acidity, 2,3 high solubility in aqueous and nonaqueous solvents, 4 suitable redox potentials for electron and proton transfer/storage, 5−7 high miscibility with sol−gel and polymer matrices, 8−11 and the ability to form supramolecular complexes with organic compounds. 12,13 Applications for these compounds have been developed in a variety of fields, acting as catalyzers, sensors, fuel cells electrolytes, and electrochromic devices. 5−7 Some of these Keggin compounds, such as the 12-tungstophosphoric acid (PW 12 O 40 H 3 , HPW), show photochromic and photochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transformations and Proton Species in 12-Phosphotungstic Acid Hexahydrate Studied by ¹H and ³¹P Solid-State Nuclear Magnetic Resonance

2014

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The hydration environments around the heteropolyanion in 12-phosphotungstic acid (PW 12 O 40 H 3 , HPW) were analyzed as a function of temperature in the hexahydrated form (HPW•6H 2 O). Samples were obtained drying HPW•nH 2 O with n ∼ 22 at 358 K for 2 h in a furnace with either uncontrolled air atmosphere or saturated with N 2 . The existence of a phase transition in HPW•6H 2 O and the change in the thermal balance of hydrated species were tested using a set of multinuclear NMR techniques: high-resolution 31 P and 1 H NMR, 31 P{ 1 H} spin−echo double resonance, and { 1 H}-31 P cross-polarization. Differences in the proton dynamics were also probed measuring the spin−lattice relaxation time in the rotating frame ( 1 H-T 1ρ ), using direct excitation of all 1 H species or selecting only those in the neighborhood of the polyanion with cross-polarization techniques. Experiments were conducted between 223 and 358 K to induce appreciable variations in the dynamic equilibrium of hydrated species. Although XRD and TGA showed the same results for both samples, consistent with HPW•6H 2 O, structural differences were detected with NMR, indicating that the material obtained from the drying process under N 2 is more compatible with the hexahydrate. 1 H NMR confirmed the existence of an equilibrium balance between hydration species as a function of temperature: H 5 O 2 + ↔ H 3 O + + H 2 O ↔ H + + 2H 2 O. Proton exchange was detected in H 3 O + and also in hydrogen bonds in H 5 O 2 + at a very fast rate, even at low temperatures. No evidence of a structural phase transition was found in this sample. For the sample dried in uncontrolled atmosphere, the presence of mobile water in clusters was detected. Heating from room temperature, the hydrated species undergo a transformation at 318 K, related to rearrangement/removal of interstitial H 2 O. A complex sequence of metastable states and hysteresis effects is observed when this sample is cooled down to room temperature. These results indicate that the transformation at 318 K is not an intrinsic property of the HPW hexahydrate structure, but it is related to the rearrangement of interstitial H 2 O.

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Investigation of inorganic cluster–surfactant flocculants for virion sequestration and removal from aqueous media

Cited by 8 publications

References 51 publications

Polyoxometalates: Building Blocks for Functional Nanoscale Systems

Polyoxometalates: Building Blocks for Functional Nanoscale Systems

Polyoxometallate als Bausteine für funktionelle Nanosysteme

Thermal Transformations and Proton Species in 12-Phosphotungstic Acid Hexahydrate Studied by ¹H and ³¹P Solid-State Nuclear Magnetic Resonance

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Investigation of inorganic cluster–surfactant flocculants for virion sequestration and removal from aqueous media

Cited by 8 publications

References 51 publications

Polyoxometalates: Building Blocks for Functional Nanoscale Systems

Polyoxometalates: Building Blocks for Functional Nanoscale Systems

Polyoxometallate als Bausteine für funktionelle Nanosysteme

Thermal Transformations and Proton Species in 12-Phosphotungstic Acid Hexahydrate Studied by 1H and 31P Solid-State Nuclear Magnetic Resonance

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Thermal Transformations and Proton Species in 12-Phosphotungstic Acid Hexahydrate Studied by ¹H and ³¹P Solid-State Nuclear Magnetic Resonance