The influence of cationic impurities in silica on its crystallization and point of zero charge

Milonjić, Slobodan K.; Čerović, Ljiljana S.; Cokesa, Djuro; Zec, S.

doi:10.1016/j.jcis.2006.12.033

Cited by 46 publications

(22 citation statements)

References 16 publications

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“…anatase, rutile and TiO 2 P25 are very well explored. [22][23][24][25][26][27] Besides common methods used for the pH iep and pH pzc determination, lately the atomic force microscopy 28 (AFM) and surface harmonic generation 29 Suspensions were stirred with a magnetic stirrer and repetitively sonicated (1500 V, 20 kHz, Sonicator Ultrasonic Processor XL, Misonix Inc.) for five minutes followed by five minutes off for a total of two hours. Prepared suspensions were transferred into the Teflon lined autoclave.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO₂ Nanomaterials

et al. 2015

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The present research focuses on the comparative investigation of the acid-base surface properties (the isoelectric point, pH iep and point of zero charge, pH pzc ) of one-dimensional TiO 2 nanomaterials. Different one-dimensional TiO 2 nanomaterials, nanotubes (NTs) and nanowires (NWs) were prepared by an alkaline hydrothermal synthesis procedure. The structural properties of the synthesized TiO 2 nanomaterials were investigated with high-resolution scanning electron microscopy (HR-SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), atomic force microscopy (AFM), powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The NWs and NTs were characterized using Raman and Fourier transform infrared (FT-IR) spectroscopy as well as Brunauer-EmmettTeller (BET) measurements. Surface properties, i.e. pH iep and pH pzc of NWs and NTs were determined from electrokinetic measurements, potentiometric mass and electrolyte titrations. The relative acidity for the NWs is found to be in the interval 3 < pH iep < 4 in comparison with the NTs, with 4

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Section: Introductionmentioning

confidence: 99%

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO₂ Nanomaterials

et al. 2015

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“…The crystallization of fused silica to cristobalite caused by high temperature treatment is widely investigated [5], [6], [7], [8], [9]. The long term behavior of crystallization has been analyzed by samples with typical temperatures and environmental contamination.…”

Section: Crystallizationmentioning

confidence: 99%

Fused silica windows for solar receiver applications

Hertel¹,

Uhlig²,

Söhn

et al. 2016

AIP Conference Proceedings

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A detailed radiation heat transfer study of a dish-Stirling receiver: The impact of cavity wall radiation properties and cavity shapes AIP Conference Proceedings 1734, 030017 (2016) Abstract. A comprehensive study of optical and mechanical properties of quartz glass (fused silica) with regard to application in high temperature solar receivers is presented. The dependence of rupture strength on different surface conditions as well as high temperature is analyzed, focussing particularly on damage by devitrification and sandblasting. The influence of typical types of contamination in combination with thermal cycling on the optical properties of fused silica is determined. Cleaning methods are compared regarding effectiveness on contamination-induced degradation for samples with and without antireflective coating. The FEM-aided design of different types of receiver windows and their support structure is presented. A large-scale production process has been developed for producing fused silica dome shaped windows (pressurized window) up to a diameter of 816 mm. Prototypes were successfully pressure-tested in a test bench and certified according to the European Pressure Vessel Directive.

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“…Nanosilica is a convenient object to study coagulation processes affected by the particulate morphology and surface structure, namely, the small size of primary particles (~10 nm) and relatively homogeneous distribution of active surface sites (silanols). There are a number of papers in the literature devoted to study of the stability of aqueous dispersions of fumed silica in the presence of various electrolytes [3,[5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions

et al. 2017

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Effects of indifferent electrolytes (NaCl, KCl, LiCl, NaI, NaNO3, CaCl2, and MgCl2) on the electrical double layer (EDL), aggregation, gelling, and rheological properties of aqueous dispersions of nanosilica were investigated. All examined indifferent electrolytes enhance interactions between nanoparticles of fumed silica through the coagulation mechanism. The critical concentration of gelation and gelling time decrease in the presence of the electrolytes, while the effective viscosity of the dispersions and average size of aggregates (Def) increase in series of chlorides: Li+ < Na+ < K+ < Ca2+ < Mg2+. That corresponds to an increase in the cation radius and reduction of the hydration shell. The nature of anions and cations significantly affects the values of Def and viscosity. For sodium salts, the viscosity increases in series I- < NO3- < Cl- corresponding to an increase in the hydration shell.

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The influence of cationic impurities in silica on its crystallization and point of zero charge

Cited by 46 publications

References 16 publications

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO₂ Nanomaterials

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO₂ Nanomaterials

Fused silica windows for solar receiver applications

Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions

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The influence of cationic impurities in silica on its crystallization and point of zero charge

Cited by 46 publications

References 16 publications

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO2 Nanomaterials

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO2 Nanomaterials

Fused silica windows for solar receiver applications

Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions

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Product

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An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO₂ Nanomaterials

An Experimental and Theoretical Approach to Understanding the Surface Properties of One-Dimensional TiO₂ Nanomaterials