Colloid crystal self-organization and dynamics at the air/water interface

Wickman, H. H.; Korley, Julius N.

doi:10.1038/30930

Cited by 90 publications

(65 citation statements)

References 16 publications

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“…Wronkiewicz et al (1996) 6 from tests with unirradiated UO 2 . The UOH phases were determined to be hydrophobic and became stabilized by attaching themselves to the air-water or non-polar-water interfaces, similar to observations in other colloidal systems (Wickman and Korley 1998). Depending on the solution conditions, the UOH particles were arranged in open diffusion-limited fractal aggregates or in tightly bound fractal structures that covered micro air bubbles.…”

Section: Colloids Formed From Commercial Spent Nuclear Fuelmentioning

confidence: 60%

“…The mechanism of thin-film straining is a complex phenomenon caused by several mechanisms, including London van der Waals forces, Coulomb forces, hydrogen bonding, and hydrophobic forces. The actual nature of the hydrophobic mineral surface-air interaction continues to be a subject of intense interest and debate (Wickman and Korley 1998;Liu et al 2003). Tests on other heavy-metal oxides reported here, including tungsten oxide (WO 3 ) and thorium oxide (ThO 2 ), demonstrated that these phases also exhibited attachment to air-water interfaces but not to the same degree as the UOH phases.…”

Section: Air-water Interfacementioning

confidence: 95%

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Alternative Conceptual Model for Colloid Generation from Commercial Spent Nuclear Fuel

Buck¹,

McNamara²,

Hanson³

2004

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SummaryYucca Mountain is the Department of Energy's potential geologic repository designed to store and dispose of commercial spent nuclear fuel (CSNF) and other high-level radioactive waste forms. If approved, the site would be the Nation's first geologic repository for disposal of this type of radioactive waste. Yucca Mountain is located in a remote desert on federally protected land within the secure boundaries of the Nevada Test Site in Nye County, Nevada. It is approximately 100 miles northwest of Las Vegas, Nevada. CSNF makes up most of the spent nuclear fuel that requires disposal at Yucca Mountain.The waste-form degradation process models provide technically defensible methods for predicting the long-term capability of the waste forms to control radionuclide release from the immediate vicinity of the waste. These models were provided as eight key feeds to the Total Systems Performance Assessment: radionuclide inventory, in-package chemistry model, cladding degradation model, commercial spent fuel degradation model, high-level waste glass degradation model, other waste-form degradation models, solubility model, and colloid model. Colloid generation from CSNF has been deemed to require further qualification by the present waste-form colloid model. The present colloid model considers the effects of pH and ionic strength on the stability of ideal colloid phases. The location of the boundaries between pH and ionic strength regimes in which colloids are stable or unstable are defined together with the colloid mass concentration in each regime.Colloids may have the potential to transport strongly sorbing radionuclide contaminants in soils and groundwater aquifers (McCarthy and Zachara 1989). Recent studies from the Nevada Test Site (NTS), a site with a similar geology to Yucca Mountain, have indicated the enhanced mobility of plutonium in the saturated zone, albeit in minute quantities, in association with various silicate minerals (Kersting et al. 1999). However, calculated flow rates for the NTS saturated zone are 1000 to 10,000 times higher than those calculated using 36 Cl migration analysis for the proposed Yucca Mountain Repository wastepackage environment under unsaturated conditions (Tompson et al. 2000; CRWMS M&O 1999). Significant colloidal transport of thorium and rare-earth elements (REE), considered to be chemical analogs for plutonium, are postulated to be rare in unsaturated environments (Wood et al. 1997). The current Yucca Mountain models for colloids would have predicted extensive thorium and REE migration, given these phases' association with clay minerals and the colloidal stability of the minerals in both unsaturated and saturated environments.Several studies have pointed to the effect of pore velocity on colloid and particulate migration. An extension of the Ryan and Gschwend (1994) empirical relationship for colloid release indicates that colloid production rates within the waste package should be negligible owing to the predicted low hydraulic conductivities. However, the most important...

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Section: Colloids Formed From Commercial Spent Nuclear Fuelmentioning

confidence: 60%

Section: Air-water Interfacementioning

confidence: 95%

Alternative Conceptual Model for Colloid Generation from Commercial Spent Nuclear Fuel

Buck¹,

McNamara²,

Hanson³

2004

View full text Add to dashboard Cite

show abstract

“…On the one hand, the temperature, nucleation and growth, components and concentrations are important ways to fabrication of the aggregates. On the other hand, the aggregation process is also an important factor to fabricate the morphologies of the colloidal particles, for example, the self-aggregation proceeded in bulk solution, in which has been acting as an important synthetic route for preparation of nanoscale functional materials with specific shapes, sizes, orientations and properties [26,34], is quite different from that of happened under the interfaceevaporated conditions [35][36][37][38]. Firstly, the critical concentration of colloidal particles is easy to exceed and the incipient crystal nucleation is ready to formation with the evaporation of solvent at air-water interface.…”

Section: Introductionmentioning

confidence: 99%

Controllable size, shape and morphology of molybdic acid self-aggregated with rhodamine B to construct functional material

Guan

Zhang

et al. 2006

Journal of Colloid and Interface Science

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“…For example, gravity sedimentation method always takes up 100 h to self-assemble PS spheres. Well-ordered spheres with single layer at the liquid surface were obtained by Wickman and Korley [11], Kempa et al [12], Wang et al [13], but this method cannot produce three-dimensional lattice, which is important for photonic crystal. Im et al [14,15], Chan et al [16] obtained well ordered spheres in three dimensions at the water-air interface by elevating the temperature of suspension.…”

Section: Introductionmentioning

confidence: 99%

Rapid self-assembly of submicrospheres at liquid surface by controlling evaporation and its mechanism

Zhang¹,

Xiong²

2007

Journal of Colloid and Interface Science

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Colloid crystal self-organization and dynamics at the air/water interface

Cited by 90 publications

References 16 publications

Alternative Conceptual Model for Colloid Generation from Commercial Spent Nuclear Fuel

Alternative Conceptual Model for Colloid Generation from Commercial Spent Nuclear Fuel

Controllable size, shape and morphology of molybdic acid self-aggregated with rhodamine B to construct functional material

Rapid self-assembly of submicrospheres at liquid surface by controlling evaporation and its mechanism

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