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Solubility

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...

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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

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Liquid-Repellent Films Comprising Octamethylsilsesquioxane Selected Based on Three-Dimensional Solubility Parameters.

Masakazu Murase¹, Riichiro Ohta¹, Takashi Iseki¹

¹Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids

|February 26, 2020

Summary

Octamethylsilsesquioxane (OMS) shows promise as a nonfluorinated liquid-repellent material. Films made with OMS particles exhibit excellent liquid repellency, comparable to or exceeding traditional fluorinated compounds.

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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Published on: February 11, 2020

Area of Science:

Materials Science
Surface Chemistry

Background:

Developing nonfluorinated liquid-repellent materials is crucial for environmental sustainability.
Siloxane compounds offer potential alternatives to fluorinated substances due to their unique chemical properties.

Purpose of the Study:

To evaluate octamethylsilsesquioxane (OMS) as an omniphobic substance for creating nonfluorinated liquid-repellent films.
To compare the liquid-repellency of OMS-based films with existing materials like polytetrafluoroethylene (PTFE).

Main Methods:

Hansen solubility parameters (HSP) were determined for OMS through dissolution tests.
Composite films were fabricated using OMS particles with Ni-P and polydimethylsiloxane (PDMS) matrices.
Liquid-repellency and water-sliding behavior of the films were evaluated.

Main Results:

HSP analysis predicted OMS to have liquid-repellency similar to PTFE.
Ni-P/OMS composite films demonstrated comparable or superior liquid-repellency to Ni-P/PTFE films, except for low surface energy liquids.
PDMS/OMS films exhibited enhanced liquid-repellency and water-sliding, overcoming the hydrophilic influence of the Ni-P matrix.

Conclusions:

Octamethylsilsesquioxane is a viable nonfluorinated alternative for liquid-repellent applications.
OMS-based composite films, particularly with a PDMS matrix, offer excellent liquid-repellency and are promising for sustainable surface technologies.