Adsorption on Silica Surfaces

Papirer, E.

doi:10.1201/9781482269703

Cited by 187 publications

(211 citation statements)

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“…The interaction of silica (which dominates in Arizona Test Dust) with water is well understood (Papirer, 2000). It is thought that ∼3 layers of water interact strongly with the surface via hydrogenbonding interactions involving the surface-capping silanol groups (Saliba et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

et al. 2005

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Abstract. The hygroscopicity of mineral aerosol samples has been examined by three independent methods: diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and differential mobility analysis. All three methods allow an evaluation of the water coverage of two samples, CaCO 3 and Arizona Test dust, as a function of relative humidity. For the first time, a correlation between absolute gravimetric measurements and the other two (indirect) methods has been established. Water uptake isotherms were reliably determined for both solids which at 298 K and 80% relative humidity exhibited similar coverages of ∼4 monolayers. However, the behaviour at low relative humidity was markedly different in the two cases, with Arizona Test Dust showing a substantially higher affinity for water in the contact layer. This is understandable in terms of the chemical composition of these two materials. The mobility analysis results are in good accord with field observations and with our own spectroscopic and gravimetric measurements. These findings are of value for an understanding of atmospheric chemical processes.

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Section: Discussionmentioning

confidence: 99%

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

et al. 2005

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“…An enormous literature exists on silica itself and its applications and excellent books and reviews are available on silica properties. In the following, many of the general concepts about silica will be borrowed from the classical book by Iler 3 and the edited book by Legrand, 4 the well-known collection of papers on adsorption at silica surfaces in the book edited by Papirer 5 and, in particular, from contributions by El Shafei, 6 Morrow and Gay 7 and Davydov. 8 Another good point of reference is the book by Vansant.…”

Section: Introductionmentioning

confidence: 99%

Silica Surface Features and Their Role in the Adsorption of Biomolecules: Computational Modeling and Experiments

et al. 2013

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“…Another factor to be considered is the possibility of multilayer adsorption, as water adsorption on previously adsorbed water molecules can be energetically favorable. 24 Indeed, multilayer water adsorption has been reported to lead to thick wetting films (of several nanometers) on hydrophilic silica surfaces at ∼50% RH. 25,26 Factors such as the ambient conditions (temperature and humidity) or the silica hydrophilicity will drastically change the amount of water and its morphology in the opal.…”

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confidence: 99%

Nanoscale Morphology of Water in Silica Colloidal Crystals

Blanco

Gallego-Gómez

López

2013

J. Phys. Chem. Lett.

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We show a simple method to visualize the morphology of water adsorbed within the pore network of colloidal crystals made of submicrometer silica spheres. Water is replicated into silica by modified silicon tetrachloride hydrolysation under standard ambient conditions, making it visible to standard electronic microscopy and thus allowing one to discern the original water distribution. Different distribution patterns are identified depending on the water content, surface condition, and spheres arrangement. The dimension and shape of wetting layers (covering the submicrometer spheres) and capillary bridges (joining them) are measurable at the nanoscale. We finally use these findings to demonstrate proof-of-principle of fabrication of isolated and freestanding silica nanorings by using hydrophobic polymeric templates and selective etching. SECTION: Physical Processes in Nanomaterials and NanostructuresH ow water distributes between solid particles drastically affects the physical properties of many colloidal and granular systems present in nature. 1−3 Direct visualization is an ideal tool for exploring the liquid morphology in such environments, but it has revealed a very difficult task, especially in three-dimensional cases and at ever-smaller scales. 4 Progress has been accomplished in at best submillimeter range using wetting liquids different than water or immersion fluids replacing the air to achieve enough contrast 5,6 and demanding techniques such as X-ray microtomography. 7 These critical drawbacks preclude the study of the most natural case: air and water between small particles. Here we demonstrate a straightforward method to visualize water distributed within the pore network between submicrometre spheres down to the nanoscale. Thereby, water is aimed to be faithfully replicated into silica by modified chemical vapor deposition (CVD) under standard ambient conditions, which can be then inspected by standard field emission scanning electron microscopy (FESEM), so the original water morphology can be discerned. To prove our method, we use colloidal crystals, a well-described system whose properties facilitate cross-checking, exploring the limits of the technique and expanding the available morphological description of such test systems. Specifically, colloidal silica is chosen because of its ability to adsorb water, versatile surface chemistry, and biocompatibility. Differences in the distribution pattern are explored under diverse spheres arrangements, silica surface hydrophilicity and ambient conditions. The morphology of the water structures (wetting layers on the spheres and capillary bridges between them) are quantifiable at the nanoscale. Calculation of the capillary forces, which depend on the accurate determination of these geometrical parameters, 8 is provided. This will allow comparison with experimental measurements by other techniques and testing of theoretical aspects not entirely understood at this scale. Finally, we use the one-pulse CVD technique on polymeric templates to demonstra...

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Adsorption on Silica Surfaces

Cited by 187 publications

References 0 publications

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

Silica Surface Features and Their Role in the Adsorption of Biomolecules: Computational Modeling and Experiments

Nanoscale Morphology of Water in Silica Colloidal Crystals

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