Glucose-functionalized polystyrene particles designed for selective deposition of silver on the surface

Burghoorn

et al. 2017

Cellulose

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For the preparation of electrically conductive composites, various combinations of cellulose and conducting materials such as polymers, metals, metal oxides and carbon have been reported. The conductivity of these cellulose composites reported to date ranges from 10-6 to 10 3 S cm-1. Cellulose nanocrystals (CNCs) are excellent building blocks for the production of high added value coatings. The essential process steps for preparing such coatings, i.e. surface modification of CNCs dispersed in water and/or alcohol followed by application of the dispersion to substrate samples using dip coating, are low cost and easily scalable. Here, we present coatings consisting of Ag modified CNCs that form a percolated network upon solvent evaporation. After photonic sintering, the resulting coatings are electrically conductive with an unprecedented high conductivity of 2.9 9 10 4 S cm-1. Furthermore, we report the first colloidal synthesis that yields CNCs with a high degree of Ag coverage on the surface, which is a prerequisite for obtaining coatings with high electrical conductivity.

Section: Introductionmentioning

confidence: 89%

Section: Tempo Mediated Oxidation Of Cncsmentioning

confidence: 99%

Electrically conductive coatings consisting of Ag-decorated cellulose nanocrystals

Burghoorn

et al. 2017

Cellulose

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“…Nanoparticles are used in products for a wide variety of applications ranging from performance polymers to pharmaceuticals, food ingredients, cosmetics and coatings and paints [1][2][3][4][5][6]. Very often, tailored nanoparticles of a specific size, shape and architecture are produced in bottom-up liquid phase syntheses [7,8].…”

Section: Introductionmentioning

confidence: 99%

Qualification of an Ultrasonic Instrument for Real-Time Monitoring of Size and Concentration of Nanoparticles during Liquid Phase Bottom-Up Synthesis

Groenestijn

et al. 2018

Applied Sciences

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The qualification of a unique ultrasonic instrument for real-time monitoring of the size and concentration of nanoparticles during bottom-up liquid phase synthesis is presented in this paper. The presented results of the ultrasonic instrument are verified with a dynamic light scattering device and a transmission electron microscope. Nanoparticles are increasingly used in numerous applications, such as in coatings, paints, cosmetics, etc. Both in the design and the production of nanoparticles there is a need for real-time measurements of their size and concentration. Ultrasound-based instruments are particularly suitable for measuring particle size and concentration, as they are non-destructive, fast, relatively cheap, and can measure in highly concentrated opaque dispersions. Also, the ultrasound sensors are robust enough to be placed inside a chemical reactor, allowing for real-time measurements of the particle size and concentration during synthesis.

“…Nanoparticles are used in products for a wide variety of applications ranging from performance polymers to pharmaceutics, food ingredients, cosmetics and coatings and paints [1][2][3][4][5][6]. Very often, such well-defined nanoparticles are produced in bottom-up liquid phase syntheses using e.g., redox or sol-gel type reactions.…”

Section: Introductionmentioning

confidence: 99%

Flow Cell Coupled Dynamic Light Scattering for Real-Time Monitoring of Nanoparticle Size during Liquid Phase Bottom-Up Synthesis

Stevens

et al. 2018

Applied Sciences

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Featured Application: A unique set-up for real-time monitoring of the size of nanoparticles during bottom-up liquid phase synthesis is presented in this article. The analysis method applied to study the size of dispersed nanoparticles during synthesis is dynamic light scattering (DLS). In contrast to conventional DLS, the DLS set-up presented in this article comprises a modulated 3D cross correlation geometry, and therefore allows accurate measurements of particle size in flow at flow rates of at least up to 17 mL·min −1 . This is essential for obtaining real-time information on the size of the dispersed nanoparticles. The DLS system could be connected to reactors of various sizes using the analysis loop presented in this article, which is coupled to a flow cell in the DLS set-up. Thus, the DLS set-up presented here is suited to study the nucleation and growth of nanoparticles in dispersion, facilitates a rational scale-up, and allows intervention in the production process of nanoparticle dispersions to minimize the number of off-spec batches.Abstract: To tailor the properties of nanoparticles and nanocomposites, precise control over particle size is of vital importance. Real-time monitoring of particle size during bottom-up synthesis in liquids would allow a detailed study of particle nucleation and growth, which provides valuable insights in the mechanism of formation of the nanoparticles. Furthermore, it facilitates a rational scale-up, and would enable adequate intervention in the production process of nanoparticle dispersions to minimize the number of off-spec batches. Since real-time monitoring requires particle size measurements on dispersions in flow, conventional dynamic light scattering (DLS) techniques are not suited: they rely on single scattering and measure the Brownian motion of particles dispersed in a liquid. Here, we present a set-up that allows accurate measurements in real-time on flowing dispersions using a DLS technique based on modulated 3D cross-correlation. This technique uses two simultaneous light scattering experiments performed at the same scattering vector on the same sample volume in order to extract only the single scattering information common to both. We connected the reactor to a flow-cell in the DLS equipment using a tailor-made analysis loop, and successfully demonstrated the complete set-up through monitoring of the size of spherical silica nanoparticles during Stöber synthesis in a water-alcohol mixture starting from the molecular precursor tetraethyl orthosilicate.