Virendra Kumar Parashar

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Related publications (44)

Controlled synthesis of fluorescent silica nanoparticles inside microfluidic droplets

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker, Ioannis Lignos

We study the droplet-based synthesis of fluorescent silica nanoparticles (50–350 nm size) in a microfluidic chip. Fluorescein-isothiocyanate (FITC) dye is first chemically linked to aminopropyl triethoxysilane (APTES) in ethanol and this reaction product i ...

Royal Society of Chemistry2012

Grafting submicron titania particles with gold nanoparticles using droplet microfluidics

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

A microfluidic method to synthesize gold–titania nanocomposites is presented. Porous TiO2 particles are first loaded with a reducing agent and then suspended in water and mixed with chloroauric acid (HAuCl4) in a droplet-by-droplet manner on a microfluidic ...

2012

Anisotropic Magnetic Porous Assemblies of Oxide Nanoparticles Interconnected Via Silica Bridges for Catalytic Application

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

We report the microfluidic chip-based assembly of colloidal silanol-functionalized silica nanoparticles using monodisperse water-in-oil droplets as templates. The nanoparticles are linked via silica bridges, thereby forming superstructures that range from ...

American Chemical Society2011

Exotic droplets formed in microfluidic chips with uniform wettability

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker, Cédric Razaname, Guillaume Louis

Microdroplets are widely used in industrial processes. In the absence of external forces, droplets generally assume a spherical shape. Here, we present two methods to form non-spherical droplets in microfluidic glass chips. A uniformly hydrophobized chip h ...

Elsevier2011

From particles to pillars: on-chip synthesis of silica nanoparticle assemblies with controlled shape and size

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

We describe the assembly of silica nanoparticles into superstructures with controlled shape and size. The individual nanoparticles are chemically linked to each other via silica bridges, thus providing high mechanical stability to the assembly. Key to cont ...

IEEE2011

Controlled Microsynthesis of Silica Particles in a Microfluidic Setup

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

We report on a novel microsynthesis method for easy controlling the size of silica micro- and nanoparticles. Colloids are synthesized in a microfluidic chamber by layer-wise adsorption of silica to precipitated nuclei. We prepare samples of spherical parti ...

Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa2009

Influence of Oil Type and Viscosity on Droplet Size in a Flow Focusing Microfluidic Device

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

We form water-in-oil droplets in a microfluidic channel-nozzle geometry for studying the influence of viscosity of oil and of different oil classes on the droplet size. We find that the chemical structure of oil dominates over its viscosity. Our studies ar ...

Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa2009

Fabrication of microfluidic mixers with varying topography in glass using the powder blasting process

Martinus Gijs, Abdeljalil Sayah, Virendra Kumar Parashar

The powder-blasting method is used to fabricate structures with a three-dimensional topography in glass using elastomeric masks. The relation between the mask opening width and the erosion depth is exploited to fabricate microstructures with varying depth ...

2009

In situ fabrication of a polyacrylamide membrane in a microfluidic channel

Martinus Gijs, Virendra Kumar Parashar, Jean-Baptiste Robert Orhan

We present a novel technological approach for the in situ realization of a micron-thin poly-acrylamide membrane in the center of a microfluidic channel. The membrane is formed by interfacial polymerization of an inner stream of monomer solution in between ...

2008

Borosilicate nanoparticles prepared by exothermic phase separation

Martinus Gijs, Abdeljalil Sayah, Virendra Kumar Parashar, Jean-Baptiste Robert Orhan

2008

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Controlled synthesis of fluorescent silica nanoparticles inside microfluidic droplets

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker, Ioannis Lignos

Royal Society of Chemistry2012

Grafting submicron titania particles with gold nanoparticles using droplet microfluidics

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

2012

Anisotropic Magnetic Porous Assemblies of Oxide Nanoparticles Interconnected Via Silica Bridges for Catalytic Application

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker

American Chemical Society2011