Formation and characterization of mixed polyelectrolyte–surfactant Langmuir layer templates for silver nanoparticle growth

Hsiao, Fang Wei; Lee, Yuh Lang; Chang, Chien Hsiang

doi:10.1016/j.colsurfa.2009.09.016

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…Aruna et al [2] reported the modifications in CO sensing of SnOx nanoparticle layers by using Pd nanoparticles; they found that the homogeneously mixed nanoparticle layers show capability between CO and ethanol as a manifestation of the dual conductance response. Hsiao et al [3] used mixed PSS-DTMA Langmuir layers to incorporate with silver precursors from the subphase and transferred them onto mica substrates; they showed that enhancing the DTMA (+) in the mixed PSS-DTMA system would increase the hydrophobic property of the complexes. Finally, they inferred that the polyelectrolyte-surfactant template can offer a potential of designing structures of polyelectrolyte-nanoparticle materials.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Visualization of Flows Laden with Cylindrical Nanoparticles in a Mixing Layer

Lin

Zhang

2018

Journal of Nanotechnology

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The motion of cylindrical particles in a mixing layer is studied using the pseudospectral method and discrete particle model. The effect of the Stokes number and particle aspect ratio on the mixing and orientation distribution of cylindrical particles is analyzed. The results show that the rollup of mixing layer drives the particles to the edge of the vortex by centrifugal force. The cylindrical particles with the small Stokes number almost follow fluid streamlines and are mixed thoroughly, while those with the large Stokes number, centrifugalized and accumulated at the edge of the vortex, are poorly mixed. The mixing degree of particles becomes worse as the particle aspect ratio increases. The cylindrical particles would change their orientation under two torques and rotate around their axis of revolution aligned to the vorticity direction when the shear rate is low, while aligning on the flow-gradient plane beyond a critical shear rate value. More particles are oriented with the flow direction, and this phenomenon becomes more obvious with the decrease of the Stokes number and particle aspect ratio.

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Section: Introductionmentioning

confidence: 99%

Simulation and Visualization of Flows Laden with Cylindrical Nanoparticles in a Mixing Layer

Lin

Zhang

2018

Journal of Nanotechnology

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“…14,15 The materials combine the mechanical stability offered by polymers and, simultaneously, the ability to form highly ordered mesophases characteristic for surfactants. Recently, such complexes have been used as templates to produce well-defined nanoarchitectures, such as mesoporous aluminosilicates, 16 hierarchically nanoporous silica nanoparticles, 17 silver nanoparticles, 18 and CdS crystals. 19 Being hierarchical self-assembly systems, PSCs have a great a) Present address: Institute of Physics, Campus Gummersbach, Cologne University of Applied Sciences, Steinmüllerallee 1, D-51643 Gummersbach, Germany.…”

Section: Introductionmentioning

confidence: 99%

Interaction of photosensitive surfactant with DNA and poly acrylic acid

Zakrevskyy

Cywiński

Cywinska

et al. 2014

The Journal of Chemical Physics

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In this paper, we investigate interactions and phase transitions in polyelectrolyte-surfactant complexes formed between a cationic azobenzene-containing surfactant and two types of polyelectrolytes: natural (DNA) or synthetic (PAA: poly acrylic acid). The construction of a phase diagram allowed distancing between four major phases: extended coil conformation, colloidally stable compacted globules, colloidal instability range, and surfactant-stabilized compact state. Investigation on the complexes' properties in different phases and under irradiation with UV light provides information about the role of the surfactant's hydrophobic trans isomers both in the formation and destruction of DNA and PAA globules as well as in their colloidal stabilization. The trans isomer shows much stronger affinity to the polyelectrolytes than the hydrophilic cis counterpart. There is no need for complete compensation of the polyelectrolyte charges to reach the complete compaction. On contrary to the findings previously reported in the literature, we demonstrate - for the first time - complete polyelectrolyte compaction which occurs already at 20% of DNA (and at 50% of PAA) charge compensation. The trans isomer plays the main role in the compaction. The aggregation between azobenzene units in the photosensitive surfactant is a driving force of this process. The decompaction can be realized during UV light irradiation and is strongly influenced by the interplay between surfactant-surfactant and surfactant-DNA interactions in the compacted globules.

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“…Patterning can also be achieved by using tailored mixes of different amphiphilic molecules, such as two different phospholipids or a polyelectrolyte and surfactant mixture. [152][153][154][155][156][157][158] When depositing nanoparticles by LB technique, a amphiphilic spacer is often used to prevent aggregration and provide more control over the interparticle spacing of the deposited monolayer. The orientation of phospholipid monolayers has been extensively studied, the results of which provide an insight into the mechanism of packing and surface coverage as a function of surface Figure 1.14).…”

Section: 61a) Langmuir-blodgett Techniquementioning

confidence: 99%

“…The orientation of phospholipid monolayers has been extensively studied, the results of which provide an insight into the mechanism of packing and surface coverage as a function of surface Figure 1.14). 155,160 (C) (A) (B)…”

Section: 61a) Langmuir-blodgett Techniquementioning

confidence: 99%

Examining the Gilded Cage: Synthesis, Optical Properties and Plasmonic Applications of Gold Nanocages

Staff¹

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The undersigned hereby recommends to the Department of Chemistry acceptance of the thesis Examining the gilded cage: synthesis, optical properties and plasmonic applications of gold nanocages Submitted by Alyssa Staff in partial fulfillment of the requirements for the degree of Abstract The methods of synthesis and characterization of the optical properties of gold nanocages produced by templated galvanic exchange of silver nanocubes is reported. The effect of surface modifications and substrate interactions were observed using ultra-violet, visible and near-infrared spectrophotometry and fluorescence spectroscopy. The refractive index sensitivity of the gold nanocage structures was altered using various combinations of conditions including size, shape, surface functionalization, substrate support, and capping with dielectric shells. Atomic force, scanning electron, and transmission electron microscopic methods were used for imaging and characterization of the gold nanocages. The potential applications of gold nanocages with various environmental and surface conditions were investigated based on the ability to tune the localized surface plasmon resonance modes to a series of desired wavelengths and bandwidths.Collaboration with the Albert group (Department of Electronics) was carried out with the successful assembly, as well as limit of detection and sensitivity improvements, of a protein biosensor supported on a titled fibre Bragg grating.Investigations into the fluorescence quenching effects of silica-capped gold nanocages was carried out using a tailored selection of fluorescent dyes to enable potential enhancement and/or quenching using the same nanostructure.The optical properties of gold nanocages allow for many potential uses of the same nanostructure in a wide variety of applications, including biomedical and biosensing applications. iv

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Formation and characterization of mixed polyelectrolyte–surfactant Langmuir layer templates for silver nanoparticle growth

Cited by 4 publications

References 27 publications

Simulation and Visualization of Flows Laden with Cylindrical Nanoparticles in a Mixing Layer

Simulation and Visualization of Flows Laden with Cylindrical Nanoparticles in a Mixing Layer

Interaction of photosensitive surfactant with DNA and poly acrylic acid

Examining the Gilded Cage: Synthesis, Optical Properties and Plasmonic Applications of Gold Nanocages

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