Surface Nanostructuring by Molecular Self-Assembly

Two dimensionally ordered, monodisperse nanoparticle arrays of metals, metal oxides and possibly alloys can be obtained by using functional diblock copolymer micelles as templates. Tunability of the block copolymer micelle sizes and periodicities has been shown in literature by changing the block ratios, substrates and dip coating speeds. Means of obtaining a two dimensional periodic array of iron oxide containing nanoparticles (and other nanoparticle arrays in general) by using Poly(styrene-block-acrylic acid) micelles is discussed. Tunability of Poly(styrene-block-vinyl pyridine) micelles in the range of 50-150 nm obtained by choice of solvents, polymer solution concentration and spin coating rotation speeds is highlighted.

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Jürgen Brugger, Harry Heinzelmann, Sivashankar Krishnamoorthy, Raphaël Pugin
2004
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https://infoscience.epfl.ch/record/101115?ln=fr

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Micelle

Une micelle (nom féminin dérivé du nom latin mica, signifiant « parcelle ») est un agrégat sphéroïdal de molécules amphiphiles, c'est-à-dire de molécules possédant une chaîne hydrophile (tête polai

Nanoparticule

Une nanoparticule est selon la norme ISO TS/27687 un nano-objet dont les trois dimensions sont à l'échelle nanométrique, c'est-à-dire une particule dont le diamètre nominal est inférieur à environ. D

Nanostructure

Une nanostructure est un assemblage d'atomes ou de molécules dont au moins une dimension est comprise entre 0,1 et 100 nanomètres. En pratique, on tolère un certain débordement dans ces limites. Ain

Self-assembly of tunable, responsive polymer nanostructures

Sivashankar Krishnamoorthy

The thesis presents a tool-box based on two dimensional self-assembly of diblock copolymer micelles to achieve nanostructures on surface with control over dimensions, spacing, surface-coverage and surface placement. Polystyrene-block-poly(2-vinyl pyridine), polystyrene-block-polyacrylic acid and polystyrene-block-polyferrocenyldimethylsilane have been used for the study. The utility of the self-assembly approach has been demonstrated by deriving other functional nanostructures like inorganic nanoparticle arrays and nanoscale pillars and holes on hard and soft substrates. In this respect, nanoparticle arrays of iron oxide with systematically tunable dimensions in the sub-10nm regime, creating sub-50nm wide Si, Si3N4, SiO2 and Quartz pillars and holes with varying aspect ratios and PDMS pillars/holes are presented. Preliminary results applying the nanostructured surfaces for applications such as carbon nanotube growth, controlling human stem-cell adhesion and expression, controlling columnar growth of physical vapor deposited TiN pyramids, and super-hydrophobic surfaces has been presented and discussed. The many interesting directions for future work based on the thesis results are presented in the outlook and where appropriate.

EPFL2006

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Tunable surface nanostructures from Block copolymer self-assembly

Jürgen Brugger, Harry Heinzelmann, Sivashankar Krishnamoorthy, Raphaël Pugin

Nanostructures are known to exhibit novel optical, electrical, and magnetic and many other interesting physical properties and a lot of research has been invested on the synthesis and study of such structures in the recent years. The massive drive towards miniaturization of devices heavily relies on the successful functioning of nanostructures. Self-assembly (or the bottom-up approaches) is emerging as an attractive tool for creating functional nanostructures owing to its simplicity and relatively low cost approaches. Nanostructures with high density and periodicity on surface are important in applications like high density data storage, sensors, catalyst support surfaces and other functional interfaces. Reverse micelles formed by the self-organization of amphiphilic diblock copolymer molecules have been used to create an array of polymer nanoparticles on silicon surface by spin coating . The formation of reverse micelles, the means of tuning their sizes and systematically varying the periodicities using solvent quality, solution concentration, deposition conditions and polymer molecular weight as handles will be presented. The hydrophilic core of the reverse micelles is capable of binding metal ions and so, inorganic nanoparticle arrays can be derived from these micelle arrays. The size of the nanoparticles in the array is further tunable by working on the loading conditions. The tunability of nanoparticle sizes will be presented as well.

2005

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