"Nanoscale zero valent iron coating for subsurface application"@en . . . "Ostrava" . "Nejv\u00FDznamn\u011Bj\u0161\u00ED probl\u00E9m spojen\u00FD s aplikac\u00ED element\u00E1rn\u00EDho nano\u017Eeleza do horninov\u00E9ho prost\u0159ed\u00ED je jeho tendence k aglomeraci a rychl\u00E9 sedimentaci ve vodn\u00E9m prost\u0159ed\u00ED. Tato pr\u00E1ce prezentuje metodu, kter\u00E1 umo\u017E\u0148uje synt\u00E9zu vrstvy amorfn\u00EDho oxidu k\u0159emi\u010Dit\u00E9ho na povrchu \u010D\u00E1stic element\u00E1rn\u00EDho nano\u017Eeleza a br\u00E1n\u00ED tak jejich aglomeraci. Metoda byla testov\u00E1na na komer\u010Dn\u00EDm produktu NANOFER 25 od \u010Cesk\u00E9 spole\u010Dnosti NANO IRON s.r.o. NANOFER 25 byl nejd\u0159\u00EDve charakterizov\u00E1n za pou\u017Eit\u00ED metod poskytuj\u00EDc\u00EDch informaci o velikosti, tvaru a f\u00E1zov\u00E9m slo\u017Een\u00ED. Tyto testy uk\u00E1zaly, \u017Ee suspenze NANOFER 25 obsahuje aglomer\u00E1ty, kter\u00E9 dosahovaly velikosti ~ 2?m a \u017Ee \u010D\u00E1stice NANOFER 25 jsou tvo\u0159eny alfa-Fe0, FeO(OH) and Fe3O4. V r\u00E1mci laboratorn\u00ED \u00FApravy NANOFER 25 byly aglomer\u00E1ty nejd\u0159\u00EDve rozdru\u017Eeny za pomoc\u00ED ultrazvuku a n\u00E1sledn\u011B pota\u017Eeny vrstvou polyvinylpyrrolidonu. K vytvo\u0159en\u00ED vrstvy oxidu k\u0159emi\u010Dit\u00E9ho na povrchu NANOFER 25 do\u0161lo v d\u016Fsledku hydrol\u00FDzy a kondenzace tetraethyl ortosilik\u00E1tu v z\u00E1sadit\u00FDch podm\u00EDnk\u00E1ch. Dal\u0161\u00ED testy byly zam\u011B\u0159eny na testov\u00E1n\u00ED vlivu \u00FApravy na sedimentovatelnost, morfologii, velikost \u010D\u00E1stic a dz\u00E9ta-potenci\u00E1l NANOFER 25. Elektronov\u00E1 mikroskopie uk\u00E1zala, \u017Ee v d\u016Fsledku \u00FApravy do\u0161lo k dezintegraci aglomer\u00E1t\u016F. Dezintegrov\u00E1n\u00E9 \u010D\u00E1stice nevykazovaly tendenci k op\u011Btovn\u00E9 aglomeraci. Upraven\u00FD NANOFER 25 rovn\u011B\u017E vykazoval ni\u017E\u0161\u00ED tendenci k sedimentaci a men\u0161\u00ED distribuci velikosti \u010D\u00E1stic ve srovn\u00E1n\u00ED s neupraven\u00FDm NANOFER 25."@cs . "RIV/60461373:22320/12:43893732!RIV13-MSM-22320___" . . "127578" . "2"^^ . "6"^^ . . "S" . . "3"^^ . "22320" . . "RIV/60461373:22320/12:43893732" . "2012-10-23+02:00"^^ . "[3E894028F355]" . . "We evaluated the efficiency of Str\u00F6ber synthesis for nanoscale zero valent iron (nZVI) stabilization. The major problem connected with nZVI applications in subsurface is its tendency to agglomeration and rapid sedimentation in aqueous media. We introduce a method for the synthesis of a silica shell on the surface of nZVI particles which protects the particles against agglomeration. The commercial suspensions NANOFER 25 produced by the Czech company NANO IRON ltd. was first characterized using methods which gave a size, shape and crystalline state. These tests showed the presence of agglomerates in a suspension. The agglomerates were first disintegrated using ultrasound. The disintegrated particles were then covered with polyvinylpyrrolidone. Silica deposition onto the surfaces of the nZVI particles was the result of the hydrolysis and condensation of tetraethyl orthosilicate in a basic condition. We assessed the sedimentation behavior of stabilized particles, morphology, particles size and dz\u00E9ta-potential. NANOFER 25 is a three-phase material of alfa-Fe0, FeO(OH) and Fe3O4 particles that form agglomerates. A median size of these agglomerates was 2.02 ?m. Electron microscopy showed that using ultrasound led to the disintegration of these agglomerates and that the surface coating protected the particles against re-agglomeration. We also observed an improvement in the particles sedimentation behavior and a decrease in particle size after the coating."@en . . "Nanoscale zero valent iron coating for subsurface application"@en . "Honetschl\u00E4gerov\u00E1, Lenka" . "Coating element\u00E1rn\u00EDho nano\u017Eeleza pro aplikaci do horninov\u00E9ho prost\u0159ed\u00ED" . "TANGER" . . . "Sofer, Zden\u011Bk" . "application; subsurface; for; coating; iron; valent; zero; Nanoscale"@en . "NANOCON 2012 Conference Proceedings 4th International conference" . "978-80-87294-32-1" . "Coating element\u00E1rn\u00EDho nano\u017Eeleza pro aplikaci do horninov\u00E9ho prost\u0159ed\u00ED"@cs . . "Nejv\u00FDznamn\u011Bj\u0161\u00ED probl\u00E9m spojen\u00FD s aplikac\u00ED element\u00E1rn\u00EDho nano\u017Eeleza do horninov\u00E9ho prost\u0159ed\u00ED je jeho tendence k aglomeraci a rychl\u00E9 sedimentaci ve vodn\u00E9m prost\u0159ed\u00ED. Tato pr\u00E1ce prezentuje metodu, kter\u00E1 umo\u017E\u0148uje synt\u00E9zu vrstvy amorfn\u00EDho oxidu k\u0159emi\u010Dit\u00E9ho na povrchu \u010D\u00E1stic element\u00E1rn\u00EDho nano\u017Eeleza a br\u00E1n\u00ED tak jejich aglomeraci. Metoda byla testov\u00E1na na komer\u010Dn\u00EDm produktu NANOFER 25 od \u010Cesk\u00E9 spole\u010Dnosti NANO IRON s.r.o. NANOFER 25 byl nejd\u0159\u00EDve charakterizov\u00E1n za pou\u017Eit\u00ED metod poskytuj\u00EDc\u00EDch informaci o velikosti, tvaru a f\u00E1zov\u00E9m slo\u017Een\u00ED. Tyto testy uk\u00E1zaly, \u017Ee suspenze NANOFER 25 obsahuje aglomer\u00E1ty, kter\u00E9 dosahovaly velikosti ~ 2?m a \u017Ee \u010D\u00E1stice NANOFER 25 jsou tvo\u0159eny alfa-Fe0, FeO(OH) and Fe3O4. V r\u00E1mci laboratorn\u00ED \u00FApravy NANOFER 25 byly aglomer\u00E1ty nejd\u0159\u00EDve rozdru\u017Eeny za pomoc\u00ED ultrazvuku a n\u00E1sledn\u011B pota\u017Eeny vrstvou polyvinylpyrrolidonu. K vytvo\u0159en\u00ED vrstvy oxidu k\u0159emi\u010Dit\u00E9ho na povrchu NANOFER 25 do\u0161lo v d\u016Fsledku hydrol\u00FDzy a kondenzace tetraethyl ortosilik\u00E1tu v z\u00E1sadit\u00FDch podm\u00EDnk\u00E1ch. Dal\u0161\u00ED testy byly zam\u011B\u0159eny na testov\u00E1n\u00ED vlivu \u00FApravy na sedimentovatelnost, morfologii, velikost \u010D\u00E1stic a dz\u00E9ta-potenci\u00E1l NANOFER 25. Elektronov\u00E1 mikroskopie uk\u00E1zala, \u017Ee v d\u016Fsledku \u00FApravy do\u0161lo k dezintegraci aglomer\u00E1t\u016F. Dezintegrov\u00E1n\u00E9 \u010D\u00E1stice nevykazovaly tendenci k op\u011Btovn\u00E9 aglomeraci. Upraven\u00FD NANOFER 25 rovn\u011B\u017E vykazoval ni\u017E\u0161\u00ED tendenci k sedimentaci a men\u0161\u00ED distribuci velikosti \u010D\u00E1stic ve srovn\u00E1n\u00ED s neupraven\u00FDm NANOFER 25." . "Coating element\u00E1rn\u00EDho nano\u017Eeleza pro aplikaci do horninov\u00E9ho prost\u0159ed\u00ED" . . . . . . . . "Janou\u0161kovcov\u00E1, Petra" . "Brno" . . "Coating element\u00E1rn\u00EDho nano\u017Eeleza pro aplikaci do horninov\u00E9ho prost\u0159ed\u00ED"@cs . . . .