Ignaas Jimidar- Dr.
- PostDoc Position at University of Twente
Ignaas Jimidar
- Dr.
- PostDoc Position at University of Twente
Particle assembly; interaction forces; tribocharging; adhesion; granular matter; soft matter; microfluidics
About
34
Publications
8,148
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137
Citations
Introduction
Current institution
Additional affiliations
May 2021 - present
February 2017 - January 2021
January 2017 - February 2021
Education
September 2013 - December 2016
October 2008 - April 2013
Publications
Publications (34)
Over the last decade, triboelectric nanogenerators (TENGs) are proposed as a viable alternative to address the impetus for affordable and clean energy. Here, a novel, cost‐effective granular‐based TENG comprising two electrodes covered with HCP monolayers of monodisperse polymer (PMMA, PS, and MF‐resin) beads with diameters ranging between 0.5 and...
This study purifies protein complexes using a novel nanobody-based affinity chromatography microcolumn and validates its digital twin model.
In this work, we investigate the transition from an amorphous state to crystal ordering of 3~mm-sized polystyrene beads in a two-dimensional system between two plates, one of them fixed and...
The self-organisation of individual suspended colloids into ordered structures that can be mediated by confinement has garnered interest recently. Despite the push for solvent reduction for sustainability reasons, the comprehension...
A spur on miniaturized devices led scientists to unravel the fundamental aspects of micro‐ and nanoparticle assembly to engineer large structures. Primarily, attention is given to wet assembly methods, whereas assembly approaches in which solvents are avoided are scarce. The “dry assembly” strategies can overcome the intrinsic disadvantages that ar...
The polarization induced by an external electric field significantly influences the contact charge of particles. It can easily cause solid–liquid–gas-like phase transitions in dense granular media, which are the key factors leading to environmental and safety disasters such as sandstorms, volcanic eruptions, and spacecraft emergencies. In this lett...
Entering an era of miniaturization prompted scientists to explore strategies to assemble colloidal crystals for numerous applications, including photonics. However, wet methods are intrinsically less versatile than dry methods, whereas the manual rubbing method of dry powders has been demonstrated only on sticky elastomeric layers, hindering partic...
Contact electrification is an interfacial process in which two surfaces exchange electrical charges when they are in contact with one another. Consequently, the surfaces may gain opposite polarity, inducing an electrostatic attraction. Therefore, this principle can be exploited to generate electricity, which has been precisely done in triboelectric...
We report on a novel concept to produce ordered beds of spherical particles in a suitable format for liquid chromatography. In this concept, spherical particles are either positioned individually (single-layer column) or stacked (multi-layer column) in micromachined pockets that form an interconnected array of micro-grooves acting as a perfectly or...
Tribocharging is the spontaneous charging of two bodies when released from contact. Even though its manifestation is commonplace, e.g., when rubbing a balloon across your hair, scientists find this phenomenon a mystery.
The present contribution marries the conceptual ideas from chemists, materials scientists and physicists on the tribocharging of...
In this extended special feature to celebrate the 35th anniversary edition of LCGC Europe, leading figures from the separation science community explore contemporary trends in separation science and identify possible future developments.
A myriad of wet assembly techniques exists to attain ordered arrays of micro- and nanoparticles. The present contribution proposes a universal and rapid (in order of a few seconds) dry assembly strategy that can be employed to assemble ordered arrays of particles with a designed spacing. This method involves shooting agglomerated monodisperse silic...
Triboelectrification is the spontaneous charging of two bodies when released from contact. Even though its manifestation is commonplace, in for instance triboelectric nanogenerators, scientists find the tribocharging mechanism a mystery. The primary aim of this mini-review is to provide an overview of different tribocharging concepts that have been...
The perpetual curiosity of scientists to fabricate new materials with pre-engineered structures and properties lies at the heart of the overwhelming diversity of methods developed to attain large-scale assembled arrays comprising ultrafine particles. Most studies aim to use the wet assembly methods, hinging predominantly on a competing balance of t...
The present contribution reports on a study aiming to find the most suitable rubbing method for filling arrays of separated and interconnected micromachined pockets with individual microspheres on rigid, uncoated silicon substrates without breaking the particles or damaging the substrate. The explored dry rubbing methods generally yielded unsatisfa...
The vibration dynamics of relatively large granular grains is extensively treated in literature, but comparable studies on the self-assembly of smaller agitated beads are lacking. In this work, we investigate...
Tribocharging is widely known to induce an electrical charge on surfaces, e.g., after rubbing a balloon on human or animal hair. We let agglomerated silica or polymer microspheres spontaneously self-organize after manual rubbing or lateral shaking on fluorocarbon-coated substrates. [1,2] Ultimately, we obtain a monolayer of microspheres matching th...
At the onset of a miniaturized device era, several promising methods, primarily wet methods, have been developed to attain large-scale assemblies of microparticles. To improve the speed, versatility and robustness of the current methods for the structured assembly of microparticles, an automatable method capable of forming 2D arrays of microspheres...
Here, we propose a universal technique to firmly capture dispersed microparticles on any desired two-dimensional array of through-pores on a surface. The 10 μm silica or polystyrene particles are reversibly captured, making them accessible for direct manipulation and inspection or subsequent transfer to other surfaces. To obtain perfect arrays with...
On the cusp of a miniaturized device era, a number of promising methods have been developed to attain large-scale assemblies of micro- and nanoparticles. In this study, a novel method is proposed to firmly capture dispersed microparticles of nominal sizes of 10 μm on a two-dimensional array (1.0 × 1.0 mm²) of through-pores on a surface. This is obt...
Analytical techniques are essential in detecting components within complex samples retrieved from various applications, e.g., rapidly detecting pathogens to prevent an outbreak. High Performance Liquid Chromatography (HPLC), is an analytical technique, in which a sample is pumped through a packed bed of microspheres (the column). Within this column...
In this work, we report on an in-depth study of how 10 μm silica and polystyrene particles interact with a target electrode after they were levitated by applying a strong electric field. The results show that, under these conditions, silica particles unexpectedly have a higher tendency to adhere on a fluorocarbon coated electrode compared to a bare...
Particle (monolayer) assembly is essential to various scientific and industrial applications, such as the fabrication of photonic crystals, optical sensors, and surface coatings. Several methods, including rubbing, have been developed for this purpose. Here, we report on the serendipitous observation that microparticles preferentially partition ont...
![Figure 2.3: The wall correction factor f (θ) introduced by Popov [27]...](profile/Ignaas-Jimidar/publication/308900394/figure/fig3/AS:669059418947604@1536527604785/The-wall-correction-factor-f-th-introduced-by-Popov-27-as-a-function-of-the-contact_Q320.jpg)
Evaporating droplets have many applications within the industry and droplets evaporating in air have been extensively studied. However droplets surrounded by another liquid have been studied less. Due to the emergence of the micro- and nanotechnology many research groups have shown interest in the contact line dynamics of surface nanodroplets and n...
Questions
Questions (13)
An estimation of the force between a charged particle (silica) on top of a charged surface
I am looking for an estimation of charge that could build up on glass or fused silica samples through triboelectrification
I am using the laminar fluid interface together with the particle tracing interface in COMSOL. I was able to track my particle in the system. But now I want to find the velocity of the fluid near the particle when the particle moves through the fluid. Streamlines would be fine also. But is seems that I am not able to do this and the streamlines do not change. Any suggestions how I can improve this of find the fluid velocity near the particle?
I have illustrted this in the picture below.
I need to find the trajectory of a particle rising in air. I want to know how I can add the buoyancy force on this particle. In the particle tracing module I found gravity and drag. But now I want to add this buoyancy force and maybe also a lift force.
Any suggestions?
Hi,
I am interested in the forces acting on microparticles (diameter between 3-10 micron) in an air stream. Is it drag, gravity, buyouncy and lift force? And so how to find this lift force. The particles are first detaching from a surface.
Thanks!
I have found some papers on the topic of detaching particles. I am interested in particles of a granular material detaching of a surface.
Does anyone know any papers, that give the reaction order for oxidization of hydrocarbons?
I am interested in good papers on the droplet dynamics on porous media (evaporation imbibition)
I am interested in nice papers on the droplet dynamics on porous media (evaporation imbibition)
