Functional Hybrid Materials with Polymer Nanoparticles as Templates

Ethirajan, Anitha; Landfester, Katharina

doi:10.1002/chem.201001477

Cited by 43 publications

(25 citation statements)

References 108 publications

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“…The charge density is in good agreement with values reported in literature. [31][32][33] In agreement with the higher hydrophilicity of the colloids induced by the higher charge density, the interfacial fraction is decreased by roughly a factor of two when changing the pH from 6 to 9; the only exception are the large 1063 nm particles, which showed a very high fraction at the interface for both pH values. No particular trend is observed concerning the values of the interfacial fractions for the differently sized particles, thus underlining the importance of the accurate determination of the interface fraction for all particles at all different experimental conditions.…”

Section: Monolayer Preparation By Compression and Surface Lowering Trsupporting

confidence: 71%

Wafer‐Scale Fabrication of Ordered Binary Colloidal Monolayers with Adjustable Stoichiometries

Vogel¹,

Viguerie²,

Jonas³

et al. 2011

Adv Funct Materials

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177

216

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Colloidal monolayers with high order and increased complexity beyond plain hexagonal packing geometries are useful for 2D templating of surface nanostructures and lithographic applications. Here, binary colloidal monolayers featuring a close‐packed monolayer of large spheres (L) with a superlattice of small particles (S) are prepared in a single step using a Langmuir trough. Adjustment of the stoichiometry of the two particle types at the air–water interface leads to a high degree of control over the occupation of the interstitial sites in the close‐packed layer of large spheres by the small colloids. Thus, large areas of binary 2D crystals with LS2, LS6, and LS9 structures are fabricated in a controlled way. The process allows the formation of binary crystals over a wide range of particle size ratios from 0.19 to 0.40. The pH value of the subphase can be used to enhance the crystallization process by changing the contact angle of the particles at the interface. An interfacial polymerization of butyl cyanoacrylate is used to directly image the contact angle of the colloids at the interface. Transfer to solid substrates is achieved by a surface lowering technique. A variety of substrates with arbitrary topographies can thus be decorated with colloidal monolayers. Applied to a lithographic process, such monolayer architectures allow the generation of complex patterns, not accessible with conventional close‐packed monolayers.

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Section: Monolayer Preparation By Compression and Surface Lowering Trsupporting

confidence: 71%

Wafer‐Scale Fabrication of Ordered Binary Colloidal Monolayers with Adjustable Stoichiometries

Vogel¹,

Viguerie²,

Jonas³

et al. 2011

Adv Funct Materials

Self Cite

177

216

View full text Add to dashboard Cite

show abstract

“…[225][226][227] In agreement with the higher hydrophilicity of the colloids induced by the higher charge density, the interfacial fraction is decreased by roughly a factor of two when changing the pH from 6 to 9; the only exception are the large 1063 nm particles, which showed a very high fraction at the interface for both pH values. No particular trend is observed concerning the values of the interfacial fractions for the differently sized particles, thus underlining the importance of the accurate determination of the interface fraction for all particles at all different experimental conditions.…”

Section: 3)supporting

confidence: 56%

Surface Patterning with Colloidal Monolayers

Vogel

2012

Springer Theses

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This thesis focuses on the controlled assembly of monodisperse polymer colloids into ordered two-dimensional arrangements. These assemblies, commonly referred to as colloidal monolayers, are subsequently used as masks for the generation of arrays of complex metal nanostructures on solid substrates.The motivation of the research presented here is twofold. First, monolayer crystallization methods were developed to simplify the assembly of colloids and to produce more complex arrangements of colloids in a precise way. Second, various approaches to colloidal lithography are designed with the aim to include novel features or functions to arrays of metal nanostructures.The air/water interface was exploited for the crystallization of colloidal monolayer architectures as it combines a two-dimensional confinement with a high lateral mobility of the colloids that is beneficial for the creation of high long range order. A direct assembly of colloids is presented that provides a cheap, fast and conceptually simple methodology for the preparation of ordered colloidal monolayers. The produced two-dimensional crystals can be transformed into nonclose-packed architectures by a plasma-induced size reduction step, thus providing valuable masks for more sophisticated lithographic processes. Finally, the controlled co-assembly of binary colloidal crystals with defined stoichiometries on a Langmuir trough is introduced and characterized with respect to accessible configurations and size ratios.Several approaches to lithography are presented that aim at introducing different features to colloidal lithography. First, using metal-complex containing latex particles, the synthesis of which is described as well, symmetric arrays of metal nanoparticles can be created by controlled combustion of the organic material of the colloids. The process does not feature an inherent limit in nanoparticle size and is able to produce complex materials as will be demonstrated for FePt alloy particles. Precise control over both size and spacing of the particle array is presented.Second, two lithographic processes are introduced to create sophisticated nanoparticle dimer units consisting of two crescent shaped nanostructures in close proximity; essentially by using a single colloid as mask to generate two structures simultaneously. Strong coupling processes of the parental plasmon resonances of the two objects are observed that are accompanied by high near-field enhancements. A plasmon hybridization model is elaborated to explain all polarization dependent shifts of the resonance positions. Last, a technique to produce laterally patterned, ultra-flat substrates without surface topographies by embedding gold nanoparticles in a silicon dioxide matrix is applied to construct robust and re-usable sensing architectures and to introduce an approach for the nanoscale patterning of solid supported lipid bilayer membranes.

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“…Surface -functionalized polymeric nanoparticles, as obtained by the copolymerization miniemulsion process with styrene and a functional monomer as AA [34] , or styrene and vinyl phosphonic acid [35] , can also be used as templates for the biomimetic mineralization of hydroxyapatite ( HAP ) in the aqueous phase [36] . Different densities of the functional groups on the surface were tested (see Figure 17.3 ).…”

Section: Particles Obtained By Radical Polymerization and Their Functmentioning

confidence: 99%

Half‐Life Extension with Pharmaceutical Formulations: Nanoparticles by the Miniemulsion Process

Landfester¹,

Musyanovych²,

Mailänder³

2012

Therapeutic Proteins

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Functional Hybrid Materials with Polymer Nanoparticles as Templates

Cited by 43 publications

References 108 publications

Wafer‐Scale Fabrication of Ordered Binary Colloidal Monolayers with Adjustable Stoichiometries

Wafer‐Scale Fabrication of Ordered Binary Colloidal Monolayers with Adjustable Stoichiometries

Surface Patterning with Colloidal Monolayers

Half‐Life Extension with Pharmaceutical Formulations: Nanoparticles by the Miniemulsion Process

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