Controlling nanoparticle template morphology: effect of solvent chemistry

2002 ◽  
Vol 752 ◽  
Author(s):  
Maria M. Cortalezzi ◽  
Vicki Colvin ◽  
Mark R. Wiesner
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Interaction Energy ◽  
Porous Solids ◽  
Porous Membranes ◽  
Effect Of Solvent ◽  
Capillary Interactions ◽  
Morphology Effect ◽  
Solvent Chemistry ◽  
Parameters Of Interest

ABSTRACTPorous solids were obtained from self-assembled deposits of silica nanoparticles used as templates to form 3-D porous membranes. The effect of the solvent chemistry on the morphology of the deposits was investigated. The parameters of interest are surface tension and ionic strength of the solvent, due to electrostatic and capillary interactions. Deposits of nanoparticles of different sizes were obtained for a variety of conditions. The deposits were imaged using SEM and showed distinctive structures for each of the solvent chemistries. The phenomenon is consistent with the DVLO theory and calculations of capillary interaction energy.

Controlling submicron-particle template morphology: effect of solvent chemistry

2005 ◽  
Vol 283 (2) ◽  
pp. 366-372 ◽  
Author(s):  
Maria M. Cortalezzi ◽  
Vicki Colvin ◽  
Mark R. Wiesner
Keyword(s):  
Submicron Particle ◽  
Effect Of Solvent ◽  
Morphology Effect ◽  
Solvent Chemistry

Capillarity in Soft Porous Solids

2020 ◽  
Vol 52 (1) ◽  
pp. 263-284 ◽  
Author(s):  
Jonghyun Ha ◽  
Ho-Young Kim
Keyword(s):  
Porous Media ◽  
Porous Materials ◽  
Porous Solids ◽  
Resurrection Plants ◽  
Wetting And Drying ◽  
Practical Applications ◽  
Capillary Interactions ◽  
Soft Porous Media ◽  
Experimental Findings ◽  
Physical Principles

Soft porous solids can change their shapes by absorbing liquids via capillarity. Such poro-elasto-capillary interactions can be seen in the wrinkling of paper, swelling of cellulose sponges, and morphing of resurrection plants. Here, we introduce physical principles relevant to the phenomena and survey recent advances in the understanding of swelling and shrinkage of bulk soft porous media due to wetting and drying. We then consider various morphing modes of porous sheets, which are induced by localized wetting and swelling of soft porous materials. We focus on physical insights with the aim of triggering novel experimental findings and promoting practical applications.

STABLE SPHEROIDAL CAP SHAPES OF DEPOSITED ATOMIC CLUSTERS

2010 ◽  
Vol 24 (17) ◽  
pp. 3411-3423 ◽  
Author(s):  
D. N. POENARU ◽  
R. A. GHERGHESCU ◽  
W. GREINER
Keyword(s):  
Surface Tension ◽  
Interaction Energy ◽  
Liquid Drop ◽  
Atomic Clusters ◽  
Liquid Drop Model ◽  
Analytical Results ◽  
Modified Surface

Neutral short and long spheroidal cap clusters have been investigated within the liquid drop model. Analytical results have been obtained for the deformation-dependent surface and curvature energies. A large variety of experimentally determined shapes (both oblate and prolate) are explained by simulating the interaction energy with the substrate with a modified surface tension of the base, and by changing the missing or extended height of the cap, d. The results are illustrated for Na 56 and Na 148 atomic clusters.

Colloid transport with wetting fronts: Interactive effects of solution surface tension and ionic strength

2010 ◽  
Vol 44 (4) ◽  
pp. 1270-1278 ◽  
Author(s):  
Jie Zhuang ◽  
Nadine Goeppert ◽  
Ching Tu ◽  
John McCarthy ◽  
Edmund Perfect ◽  
...  
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Interactive Effects ◽  
Colloid Transport ◽  
Solution Surface

scholarly journals Effect of Solvent on Protonation Equilibria ofL-Proline andL-Valine in 1, 2-Propanediol-Water Mixtures

2012 ◽  
Vol 9 (2) ◽  
pp. 517-524 ◽  
Author(s):  
P. Bhushanavathi ◽  
B. Veeraswamy ◽  
G. Nageswara Rao ◽  
U. Viplavaprasad
Keyword(s):  
Dielectric Constant ◽  
Sodium Chloride ◽  
Ionic Strength ◽  
Protonation Constants ◽  
Protonation Equilibria ◽  
Effect Of Solvent ◽  
R Factor ◽  
Chemical Models ◽  
Best Fit ◽  
Skewness And Kurtosis

Protonation equilibria ofL-proline and L-valine in varying compositions (0.0-60.0% v/v) of 1, 2-Propanediol-water mixtures were investigated pH-metrically. Titrations were performed at 303.0 K and the ionic strength of the medium was maintained at 0.16 mol L-1using sodium chloride. The best fit chemical models of the protonation equilibria were based on crystallographic R-factor, Χ2, skewness, and kurtosis. All the protonation constants of proline and valine increased with increasing propanediol content. This is attributed to the dielectric constant of the medium.

Modeling of Self-Assembly Dynamics of Photolithographically Patterned MUFFINS Biosensor Arrays

2007 ◽  
Vol 1002 ◽  
Author(s):  
Saul Lee ◽  
Peter Carmichael ◽  
Jason Meiring ◽  
Michael Dickey ◽  
Scott Grayson ◽  
...  
Keyword(s):  
Surface Tension ◽  
Self Assembly ◽  
Particle Density ◽  
Assembly Model ◽  
Polymer Medium ◽  
Biosensor Arrays ◽  
Capillary Interactions ◽  
Low Costs ◽  
The Individual ◽  
Flotation Behavior

ABSTRACTThe ability to mass produce biosensor arrays at low costs is an important target for the diagnostics industry. Our group has previously explored the batch production of mesoscale sized hydrogels as platforms for biosensors using photolithographic techniques. The individual hydrogel features were self-assembled through lateral capillary interactions to form a closed packed configuration and the pre-polymer medium was subsequently UV-cured to form the array. To understand the self-assembly dynamics, we investigated, through simulation, the flotation behavior of two assembling particles and its dependence on physical constants such as surface tension and particle density. Simulation results revealed that the objects tilt toward each other as they came into proximity. The tilt angle decreased with increasing surface tension but increased with increasing particle density. Understanding the details of the flotation behavior is necessary in the development of a full scale self-assembly model.

Surface properties of the bovine casein components: relationships between structure and foaming properties

1989 ◽  
Vol 56 (3) ◽  
pp. 495-502 ◽  
Author(s):  
Denis Lorient ◽  
Brigitte Closs ◽  
Jean Luc Courthaudon
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Foam Stability ◽  
Covalent Binding ◽  
High Surface ◽  
Surface Hydrophobicity ◽  
Foaming Properties ◽  
Foam Formation ◽  
Foaming Capacity ◽  
Low Ionic Strength

SummaryIn order to optimize the use of caseins as surfactants, the surface tension, foaming capacity and stability were measured as a function of pH, ionic strength, protein concentration and polarity (modified by covalent binding of carbohydrates). We found that the caseins differ in their behaviour at the air/water interface with β-casein showing the greatest ability to decrease surface tension and to produce foams, due probably to its amphipathic structure. In experiments carried out at pH values close to pI, with low ionic strength and constant solubility (optimal conditions for foam formation), we observed a high surface hydrophobicity, a good accessibility and flexibility of peptidic side chains (evaluated by proteolysis), and a high foaming capacity parallelled by increased surface pressure. Foam stability of caseins was low compared to those of globular proteins such as β lactoglobulin.

Effect of solvent surface tension on the radius of hematite nanoparticles

2014 ◽  
Vol 76 (6) ◽  
pp. 782-787 ◽  
Author(s):  
Ali Nakhaei Pour ◽  
Mohammad Reza Housaindokht ◽  
Hassan Monhemi
Keyword(s):  
Surface Tension ◽  
Hematite Nanoparticles ◽  
Effect Of Solvent
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