scholarly journals Formation of Hierarchical Porous Films with Breath-Figures Self-Assembly Performed on Oil-Lubricated Substrates

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3051 ◽  
Author(s):  
Edward Bormashenko ◽  
Yelena Bormashenko ◽  
Mark Frenkel
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Silicone Oil ◽  
Contact Angles ◽  
Porous Films ◽  
Voronoi Tessellations ◽  
Breath Figures ◽  
Glass Substrates ◽  
Industrial Grade ◽  
Hierarchical Porous

Hierarchical honeycomb patterns were manufactured with breath-figures self-assembly by drop-casting on the silicone oil-lubricated glass substrates. Silicone oil promoted spreading of the polymer solution. The process was carried out with industrial grade polystyrene and polystyrene with molecular mass M w = 35 , 000 g m o l . Both polymers gave rise to patterns, built of micro and nano-scaled pores. The typical diameter of the nanopores was established as 125 nm. The mechanism of the formation of hierarchical patterns was suggested. Ordering of the pores was quantified with the Voronoi tessellations and calculation of the Voronoi entropy. The Voronoi entropy for the large scale pattern was S v o r = 0.6 − 0.9 , evidencing the ordering of pores. Measurement of the apparent contact angles evidenced the Cassie-Baxter wetting regime of the porous films.

scholarly journals Formation of Hierarchical Porous Films with Breath-Figures Self-Assembly Performed on Oil-Lubricated Substrates

2019 ◽  
Author(s):  
Edward Bormashenko ◽  
Yelena Bormashenko ◽  
Mark Frenkel
Keyword(s):  
Self Assembly ◽  
Silicone Oil ◽  
Contact Angles ◽  
Porous Films ◽  
Voronoi Tessellations ◽  
Breath Figures ◽  
Glass Substrates ◽  
Industrial Grade ◽  
Hierarchical Porous ◽  
Entropy Measurement

Hierarchical honeycomb patterns were manufactured with the breath-figures self-assembly by drop-casting on the silicone-oil lubricated glass substrates. Silicone oil promoted spreading of the polymer solutions. The process was carried out with the industrial grade polystyrene and polystyrene with the molecular weight Mw=35.000. Both of polymers gave rise to the patterns, built from micro- and nano-scaled pores. Ordering of the pores was quantified with the Voronoi tessellations and calculating the Voronoi entropy. Measurement of the apparent contact angles evidenced the Cassie - Baxter wetting regime of the porous films.

A Novel Technique for Large-Scale Fabrication of 3D Colloidal Crystals: Suspending Self-Assembly in Water Medium (SSAM)

2021 ◽  
Author(s):  
Zhengting Zhang ◽  
Guiyun Yi ◽  
Xiaodong Wang ◽  
Peng Li ◽  
Zhuoyan Wan ◽  
...  
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Colloidal Crystals ◽  
Water Medium ◽  
Novel Technique

scholarly journals Kinked Bisamides as Efficient Supramolecular Foam Cell Nucleating Agents for Low-Density Polystyrene Foams with Homogeneous Microcellular Morphology

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1094
Author(s):  
Bastian Klose ◽  
Daniel Kremer ◽  
Merve Aksit ◽  
Kasper P. van der Zwan ◽  
Klaus Kreger ◽  
...  
Keyword(s):  
Cell Size ◽  
Self Assembly ◽  
Large Scale ◽  
Elevated Temperatures ◽  
Foam Cell ◽  
Cell Structure ◽  
Expansion Ratio ◽  
Low Density ◽  
Nucleating Agents ◽  
Foam Density

Polystyrene foams have become more and more important owing to their lightweight potential and their insulation properties. Progress in this field is expected to be realized by foams featuring a microcellular morphology. However, large-scale processing of low-density foams with a closed-cell structure and volume expansion ratio of larger than 10, exhibiting a homogenous morphology with a mean cell size of approximately 10 µm, remains challenging. Here, we report on a series of 4,4′-diphenylmethane substituted bisamides, which we refer to as kinked bisamides, acting as efficient supramolecular foam cell nucleating agents for polystyrene. Self-assembly experiments from solution showed that these bisamides form supramolecular fibrillary or ribbon-like nanoobjects. These kinked bisamides can be dissolved at elevated temperatures in a large concentration range, forming dispersed nano-objects upon cooling. Batch foaming experiments using 1.0 wt.% of a selected kinked bisamide revealed that the mean cell size can be as low as 3.5 µm. To demonstrate the applicability of kinked bisamides in a high-throughput continuous foam process, we performed foam extrusion. Using 0.5 wt.% of a kinked bisamide yielded polymer foams with a foam density of 71 kg/m3 and a homogeneous microcellular morphology with cell sizes of ≈10 µm, which is two orders of magnitude lower compared to the neat polystyrene reference foam with a comparable foam density.

Large Scale Supramolecular Self-Assembly of Graft-Copolymers Prepared by Rapid Evaporation of Organic Solvents

1999 ◽  
Vol 28 (11) ◽  
pp. 1221-1222 ◽  
Author(s):  
Akio Kishida ◽  
Fusako Seto ◽  
Ken-ichiro Hiwatari ◽  
Takeshi Serizawa ◽  
Youichiro Muraoka ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Self Assembly ◽  
Large Scale ◽  
Graft Copolymers

Modelling the dynamics of a minimal protocell container

2005 ◽  
Vol 4 (1) ◽  
pp. 81-91 ◽  
Author(s):  
Martin Nilsson Jacobi ◽  
Steen Rasmussen ◽  
Kolbjørn Tunstrøm
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Lattice Gas ◽  
Three Dimensional ◽  
Initial Distribution ◽  
Energy Potential ◽  
Time Dynamics ◽  
Amphiphilic Molecules ◽  
Head Groups ◽  
Simplifying Assumptions

This paper is a discussion on how reaction kinetics and three-dimensional (3D) lattice simulations can be used to elucidate the dynamical properties of micelles as a possible minimal protocell container. We start with a general discussion on the role of molecular self-assembly in prebiotic and contemporary biological systems. A simple reaction kinetic model of a micellation process of amphiphilic molecules in water is then presented and solved analytically. Amphiphilic molecules are polymers with hydrophobic (water-fearing), e.g. hydrocarbon tail groups, and hydrophilic (water-loving) head groups, e.g. fatty acids. By making a few simplifying assumptions an analytical expression for the size distribution of the resulting micelles can be derived. The main part of the paper presents and discusses a lattice gas technique for a more detailed 3D simulation of molecular self-assembly of amphiphilic polymers in aqueous environments. Water molecules, hydrocarbon tail groups and hydrophilic head groups are explicitly represented on a three-dimensional discrete lattice. Molecules move on the lattice proportional to their continuous momentum. Collision rules preserve momentum and kinetic energy. Potential energy from molecular interactions are also included explicitly. The non-trivial thermodynamics of large-scale and long-time dynamics are studied. In this paper we specifically demonstrate how, from a random initial distribution, micelles are formed and grow until they destabilize and can divide. Eventually a steady state of growing and dividing micelles is formed. Towards the end of the paper we discuss the relevance of the presented results to the design of a minimal artificial protocell.

Environmentally safe, substrate-independent and repairable nanoporous coatings: large-scale preparation, high transparency and antifouling properties

2017 ◽  
Vol 5 (38) ◽  
pp. 20277-20288 ◽  
Author(s):  
Yong Li ◽  
Zhaozhu Zhang ◽  
Mengke Wang ◽  
Xuehu Men ◽  
Qunji Xue
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Intrinsic Properties ◽  
High Transparency ◽  
Assembly Method ◽  
Antifouling Coatings ◽  
Large Scale Preparation ◽  
Environmentally Safe ◽  
Scale Preparation ◽  
Substrate Independent

Repairable and antifouling coatings were prepared via self-assembly method without destroying the intrinsic properties of substrates, which aims to tackle low transparency and poor durability problems of current coatings.

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