scholarly journals Floating and sinking of self-assembled spheres on liquid-liquid interfaces: rafts versus stacks

2021 ◽  
Author(s):  
Steven G. Jones ◽  
Niki Abbasi ◽  
Abhinav Ahuja ◽  
Vivian Truong ◽  
Scott S. H. Tsai
Keyword(s):  
Critical Size ◽  
Bond Number ◽  
Fluid Interfaces ◽  
Liquid Interfaces ◽  
Dimensionless Ratio ◽  
Oil Water ◽  
Self Assembled ◽  
Size Limits ◽  
The Stability ◽  
Number Of Particles

The floating and sinking of objects on fluid-fluid interfaces occurs in nature, and has many important implications in technology. Here, we study the stability of floating self-assembled spheres on an oil-water interface, and how the sphere deposition geometry affects the size limits of the assemblies before they collapse and sink through the interface. Specifically, we compare the critical size of particle rafts to particle stacks. We show that, on liquid-liquid interfaces, monolayer rafts and stacked sphere exhibit different scaling of the critical number of spheres to the Bond number - the dimensionless ratio of buoyancy to interfacial tension effects. Our results indicate that particle stacks will sink with a lower threshold number of particles than particle rafts. This finding may have important implications to engineering applications where interfacial assemblies are not monolayers.

scholarly journals Floating and sinking of self-assembled spheres on liquid-liquid interfaces: rafts versus stacks

2021 ◽  
Author(s):  
Steven G. Jones ◽  
Niki Abbasi ◽  
Abhinav Ahuja ◽  
Vivian Truong ◽  
Scott S. H. Tsai
Keyword(s):  
Critical Size ◽  
Bond Number ◽  
Fluid Interfaces ◽  
Liquid Interfaces ◽  
Dimensionless Ratio ◽  
Oil Water ◽  
Self Assembled ◽  
Size Limits ◽  
The Stability ◽  
Number Of Particles

The floating and sinking of objects on fluid-fluid interfaces occurs in nature, and has many important implications in technology. Here, we study the stability of floating self-assembled spheres on an oil-water interface, and how the sphere deposition geometry affects the size limits of the assemblies before they collapse and sink through the interface. Specifically, we compare the critical size of particle rafts to particle stacks. We show that, on liquid-liquid interfaces, monolayer rafts and stacked sphere exhibit different scaling of the critical number of spheres to the Bond number - the dimensionless ratio of buoyancy to interfacial tension effects. Our results indicate that particle stacks will sink with a lower threshold number of particles than particle rafts. This finding may have important implications to engineering applications where interfacial assemblies are not monolayers.

Particle clusters at fluid–fluid interfaces: equilibrium profiles, structural mechanics and stability against detachment

Soft Matter ◽  
2019 ◽  
Vol 15 (24) ◽  
pp. 4921-4938 ◽  
Author(s):  
Jan Guzowski ◽  
Bopil Gim
Keyword(s):  
Contact Angle ◽  
Body Force ◽  
Structural Mechanics ◽  
Fluid Interfaces ◽  
Equilibrium Profiles ◽  
The Stability ◽  
Number Of Particles ◽  
External Body

We investigate the stability of interfacial particle clusters aggregating under an external body force depending on the number of particles and the contact angle.

scholarly journals Self-Assembled Molecular Rafts at Liquid|Liquid Interfaces for Four-Electron Oxygen Reduction

2011 ◽  
Vol 134 (1) ◽  
pp. 498-506 ◽  
Author(s):  
Astrid J. Olaya ◽  
Delphine Schaming ◽  
Pierre-Francois Brevet ◽  
Hirohisa Nagatani ◽  
Tomas Zimmermann ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Liquid Interfaces ◽  
Self Assembled

The Optimum Quality Index for the Stability of In-Parallel Planar Platform Devices

1999 ◽  
Vol 121 (1) ◽  
pp. 15-20 ◽  
Author(s):  
J. Lee ◽  
J. Duffy ◽  
M. Keler
Keyword(s):  
Optimal Design ◽  
Equilateral Triangle ◽  
Quality Index ◽  
Optimal Shape ◽  
Geometrical Meaning ◽  
Moving Platforms ◽  
Maximum Value ◽  
Dimensionless Ratio ◽  
Parallel Platform ◽  
The Stability

The paper investigates primarily the geometrical meaning of the determinant of the Jacobian (det j) of the three connector lines of a planar in-parallel platform device using reciprocity. A remarkably simple result is deduced: The maximum value of det j namely, det jm is simply one-half of the sum of the lengths of the sides of the moving triangular platform. Further, this result is shown to be independent of the location of the fixed pivots in the base. A dimensionless ratio λ = |det j|/det jm is defined as the quality index (0 ≤ λ ≤ 1) and it is proposed here to use it to measure “closeness” to a singularity. An example which determines the optimal design by comparing different shaped moving platforms having the same det jm is given and demonstrates that the optimal shape is in fact an equilateral triangle

scholarly journals An estimation on the mechanical stabilities of SAMs by low energy Ar+ cluster ion collision

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Y. Tong ◽  
G. R. Berdiyorov ◽  
A. Sinopoli ◽  
M. E. Madjet ◽  
V. A. Esaulov ◽  
...  
Keyword(s):  
Electron Irradiation ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Crystal Surface ◽  
Depth Profiling ◽  
Low Energy ◽  
Cross Linking ◽  
Xps Spectra ◽  
Self Assembled ◽  
The Stability

AbstractThe stability of the molecular self-assembled monolayers (SAMs) is of vital importance to the performance of the molecular electronics and their integration to the future electronics devices. Here we study the effect of electron irradiation-induced cross-linking on the stability of self-assembled monolayer of aromatic 5,5′-bis(mercaptomethyl)-2,2′-bipyridine [BPD; HS-CH2-(C5H3N)2-CH2-SH] on Au (111) single crystal surface. As a refence, we also study the properties of SAMs of electron saturated 1-dodecanethiol [C12; CH3-(CH2)11-SH] molecules. The stability of the considered SAMs before and after electron-irradiation is studied using low energy Ar+ cluster depth profiling monitored by recording the X-ray photoelectron spectroscopy (XPS) core level spectra and the UV-photoelectron spectroscopy (UPS) in the valance band range. The results indicate a stronger mechanical stability of BPD SAMs than the C12 SAMs. The stability of BPD SAMs enhances further after electron irradiation due to intermolecular cross-linking, whereas the electron irradiation results in deterioration of C12 molecules due to the saturated nature of the molecules. The depth profiling time of the cross-linked BPD SAM is more than 4 and 8 times longer than the profiling time obtained for pristine and BPD and C12 SAMs, respectively. The UPS results are supported by density functional theory calculations, which show qualitative agreement with the experiment and enable us to interpret the features in the XPS spectra during the etching process for structural characterization. The obtained results offer helpful options to estimate the structural stability of SAMs which is a key factor for the fabrication of molecular devices.

Two- and four-armed hetero porphyrin dimers: Influence of the number of arms on the stability and specific recognition behaviour

2021 ◽  
Author(s):  
Masaki Ueda ◽  
Masaki Kimura ◽  
Shinobu Miyagawa ◽  
Masaya Naito ◽  
Hikaru Takaya ◽  
...  
Keyword(s):  
Salt Bridges ◽  
Specific Recognition ◽  
Self Assembled ◽  
The Stability ◽  
Porphyrin Dimers

In this study we self-assembled the four-armed porphyrin hetero dimer capsule Cap4, stabilized through amidinium–carboxylate salt bridges, in CH2Cl2 and CHCl3. The dimer capsule Cap4 was kinetically and thermodynamically more...

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