Decoration criteria for surface steps

Sholl, C A; Fletcher, Neville H.

doi:10.1016/0001-6160(70)90006-4

Cited by 70 publications

(67 citation statements)

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“…On the left-hand side of the top pore there is a narrow wedge, a wedge with a large value of α. In the section on heterogeneous nucleation we found that the nucleation barrier tends to zero as θ − α tends to zero and so wedges with large values of α have small nucleation barriers, see [13]. Thus on increasing the supersaturation nucleation will occur in the narrow wedge with α > 45 • before it occurs in the corners with α = 45 • .…”

Section: Nucleation At Phase Transitions In Porous Mediamentioning

confidence: 89%

Nucleation: theory and applications to protein solutions and colloidal suspensions

Sear

2007

J. Phys.: Condens. Matter

423

505

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The status of our understanding of nucleation is reviewed. Both general aspects of nucleation and those specific to protein solutions and colloidal suspensions are considered. We conclude that although we have what we believe is a quite good understanding of homogeneous nucleation in one simple system, hard-sphere colloids, in other systems there are still basic questions that are unanswered. For example, for even the most studied protein, lysozyme, there is an ongoing debate about whether the observed nucleation is homogeneous or heterogeneous. We review theoretical and simulation work on both homogeneous and heterogeneous nucleation. As heterogeneous nucleation appears to be much more common than homogeneous nucleation, and as earlier reviews have tended to focus more on homogeneous nucleation, we place particular emphasis on heterogeneous nucleation.

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Section: Nucleation At Phase Transitions In Porous Mediamentioning

confidence: 89%

Nucleation: theory and applications to protein solutions and colloidal suspensions

Sear

2007

J. Phys.: Condens. Matter

423

505

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“…cosθ`1 4 cos 3 θ˙ (9) while the heterogeneous nucleation energy barrier in a wedge [79] with a characteristic length greater than the critical radius R˚is: ( 10) where θ is the contact angle of the nucleus at the surface, α is the angle of the wedge, and cos Figure 12a). The Equation (10) is valid for p180´αq {2 ď θ ď p180`αq {2 and 0 ď α ď 180˝.…”

Section: R˚" 2γmentioning

confidence: 99%

Anti-Icing Superhydrophobic Surfaces: Controlling Entropic Molecular Interactions to Design Novel Icephobic Concrete

Ramachandran

Kozhukhova

Соболев

et al. 2016

Entropy

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Abstract:Tribology involves the study of friction, wear, lubrication, and adhesion, including biomimetic superhydrophobic and icephobic surfaces. The three aspects of icephobicity are the low ice adhesion, repulsion of incoming water droplets prior to freezing, and delayed frost formation. Although superhydrophobic surfaces are not always icephobic, the theoretical mechanisms behind icephobicity are similar to the entropically driven hydrophobic interactions. The growth of ice crystals in saturated vapor is partially governed by entropically driven diffusion of water molecules to definite locations similarly to hydrophobic interactions. The ice crystal formation can be compared to protein folding controlled by hydrophobic forces. Surface topography and surface energy can affect both the icephobicity and hydrophobicity. By controlling these properties, micro/nanostructured icephobic concrete was developed. The concrete showed ice adhesion strength one order of magnitude lower than regular concrete and could repel incoming water droplets at´5˝C. The icephobic performance of the concrete can be optimized by controlling the sand and polyvinyl alcohol fiber content.

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“…This behaviour is well described by classical nucleation theory 121 . The classical nucleation theory prediction for the nucleation barrier in a wedge is that the barrier has the form ∆F * (θ, β) 154 . Here θ is the contact angle the interface between the nucleus and the bulk phase makes with a flat surface.…”

Section: Wedgesmentioning

confidence: 99%

The non-classical nucleation of crystals: microscopic mechanisms and applications to molecular crystals, ice and calcium carbonate

Sear

2012

International Materials Reviews

206

219

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Crystals form via nucleation followed by growth. Often nucleation data is interpreted using the classical theory of nucleation, which is essentially a simple theory for the nucleation of a fluid phase. I characterise this classical theory as making six assumptions; I discuss each assumption in turn. I then review experiments and simulations that find nucleation behaviour that cannot be described by the classical theory. The experiments are on the crystallisation from solution of molecules such as drugs and related molecules, ice and calcium carbonate. The review also covers work on non-classical nucleation in solutions of the protein lysozyme, and work on the fascinating phenomenon of nucleation induced by laser pulses. I hope this review will be of interest to those studying the crystallisation of both molecules and ions from solution. The review aims to advance our understanding of the crucial first step in crystallisation, and to enable researchers studying crystallisation in one system to learn from what others have done in studying analogous phenomena in different systems.

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Decoration criteria for surface steps

Cited by 70 publications

References 1 publication

Nucleation: theory and applications to protein solutions and colloidal suspensions

Nucleation: theory and applications to protein solutions and colloidal suspensions

Anti-Icing Superhydrophobic Surfaces: Controlling Entropic Molecular Interactions to Design Novel Icephobic Concrete

The non-classical nucleation of crystals: microscopic mechanisms and applications to molecular crystals, ice and calcium carbonate

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