K. Berton's research while affiliated with French National Centre for Scientific Research and other places

Publications (40)

Article
With the rise of microfluidics for the past decade, there has come an ever more pressing need for a low-cost and rapid prototyping technology, especially for research and education purposes. In this article, we report a rapid prototyping process of chromed masks for various microfluidic applications. The process takes place out of a clean room, use...
Article
3D control of the motion of self-powered micromotors is demonstrated using AC electrokinetics by applying an AC electric field on indium tin oxide transparent electrodes. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Article
The use of surface coating on biomaterials can render the original substratum with new functionalities that can improve the chemical, physical, and mechanical properties as well as enhance cellular cues such as attachment, proliferation, and differentiation. In this work, we combined biocompatible polydimethylsiloxane (PDMS) with a biomimetic polye...
Article
Two-photon polymerization with a visible micro-laser is used to polymerize several resists in a microfluidic channel. The minimum resolution that is achievable, named voxel, is estimated using an ascending scan method for different photosensitive polymers: standard microelectronics resists such as SU8 and AZ1512HS - construction resists such as PEG...
Article
Janus particles have proven to be original particles to sense protein-cell interactions or to organize cell on a substrate. This work presents a covalent coupling strategy to graft fibronectin on a specific side of Au/PS or Au/SiO(2) 1 mu m Janus particles. By studying several buffers that could limit adsorption of protein on plain particles of PS,...
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We propose a method to experimentally determine the Clausius–Mossotti factors and surface capacitances of colloidal particles. This two-step method is based on the following: (i) a precise positioning of particles on activated electrodes according to the applied frequency of an electric field and (ii) particles velocities measurements from a pure d...
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Nanoscale Gold colloidal dimers are built thanks to the convective capillary force assembly (CFA) technique. CFA efficiently demonstrates precise dimer localization, particle separation control, and object reproducibility. Darkfield microspectroscopy measurements combined with numerical modeling exhibit a redshift in the dimer surface plasmon reson...
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Spatial localization and handling of cells and colloid trajectories in a micro fluidic channel are required to fully control their interactions at a single level. This paper presents a novel transparent multilevel aligned electrode micro fluidic chip that is fast to process and reusable, with which high throughput for dielectrophoretic handling of...
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Colloidal waveguide fabrication based on the convective assisted capillary force assembly technique and their optical properties is presented in this work. A large variety in shape of colloidal waveguides is built with their own integrated local light sources. It is highlighted that these structures exhibit propagation of the visible light at the m...
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In this work, Janus particles (Au/fluorescent polystyrene) are fabricated and their flip/flop rotational effect is studied in a microfluidic channel thanks to dielectrophoresis, providing a new type of local light switch. A method for producing large amounts (more than 10(6) particles/ml) of Janus particles is first presented. Those particles were...
Article
Janus particles are dissymmetric systems with 2 faces that could present 2 different physical/chemical properties, offering new possibilities in microfluidic research fields. This work presents a novel approach of handling the rotation of Janus particles with dielectrophoresis in a determined location at the single level. We first present the manuf...
Article
Precise spatial localization of colloids is required to fully exploit the potential of colloidal handling in a microfluidic channel. In this work, we present the fabrication and integration of a new type of microfluidic chip that can provide such tools. With the use of photopatternable silicones, two levels of metal deposited electrodes are sandwic...
Article
Rod-shaped CdSe nanocrystals show narrow-band, linearly polarized emission and anisotropic charge-transport properties. The alignment of nanorods (NRs) on a macroscopic scale makes it possible to prepare a novel class of materials with intrinsically anisotropic optical and electric properties. To integrate NRs in useful devices, low-cost assembly m...
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Full-text available
A new colloidal assembly technique in a microfluidic cell is proposed in this work. This technique is based on classic capillary force assembly (CFA) assisted by air-suction flow and temperature control during the assembly process. Their influence on the assembly macroscopic (triple contact-line speed, receding contact angle) and microscopic (collo...
Article
Resist pull-off during mold-substrate separation is one of the major limiting factor for high resolution replication using nanoimprint lithography (NIL). Adhesion properties of anti-sticking layers (ASLs) are generally obtained using contact angle measurements; however, this technique does not take into account mold penetration into the polymer and...
Article
Precise localization of nanoparticles is often required to fully exploit the intrinsic physical properties as well as to develop methodologies for large-scale integration of nanodevice building-blocks with the macroscopic world. In this work, a simple technique, based on control of capillary forces at the triple contact line during evaporation, was...
Article
We present the development of a reliable 4 in. lift-off process based on trilayer nanoimprint lithography (NIL). At first, an inductively coupled plasma etching step of the imprinted resist is used to remove the residual resist thickness after NIL for different pattern geometry and density, while maintaining the critical dimensions of the studied p...
Article
We present the replication of sub-40nm nanoelectrodes over an 8-in. silicon wafer using nanoimprint lithography (NIL). Three different NIL polymers (NEB22A2, PMMA and Polycarbonate) are investigated as potential replication candidates. For each polymer resist, we study the single step imprint of both micrometric contact pads and nanoelectrodes. Flo...

Citations

... These films have many advantages, including a short processing time and a uniform photoresist distribution [23]. Moreover, the exposure energy is noticeably lower in this case, which means cheaper and more compact light sources such as commercial LEDs can be used [24]. However, these techniques still require the engineering of high precision photomasks representing the circuits to be drawn on the resin. ...
... Metal nanoelectrodes with less than 100 nm in lateral side and a few microns of longitudinal size have attracted a great deal of attention in recent years because of the advantages they present, such as higher current density and higher signal-to-noise ratio compared to conventional microelectrodes [1]. Electrodes with nanometrical width and inter-electrode spacing have been fabricated by nanoimprint lithography (NIL)234 or focused-ion-beam lithography (FIB) [5] and have been used in a large variety of applications, e.g. for contacting single molecules678, for impedimetrical biosensing91011 or for conducting nanoelectrochemical tests [12, 13]. Regarding biodetection purposes, interdigitated nanoelectrode devices (INDs) combine the aforementioned confinement effects with large areas, enabling one to combine sensitivity and fast response time. ...
... There are different routes for powering these devices, such as: (i) chemical [3,4], (ii) magnetic [5,6], (iii) ultrasound [7,8], (iv) electrical [9,10], and (v) light [11][12][13][14][15]. Among these, light-driven MNMs have gained attention due to the possibility to convert light energy into kinetic energy as "fuel-free MNM" [16][17][18]. ...
... Capillary Force Assembly (CFA) technology is able to deterministically place particles into lithographed patterns [17,29] as shown more specifically with thermodynamic CFA [30,31]. This technology is based on the water partial pressure and temperature control in a microfluidic cell during the colloidal droplet evaporation above a patterned substrate. ...
... [5][6][7][8][9] Several techniques for aligning NRs have been explored and it was found that electric-field-driven deposition from a colloidal suspension is efficient for many kinds of anisotropic particles: nanowires, 10 carbon nanotubes, 11 gold NRs, 12,13 and semiconductor NRs. 3,6,[14][15][16] Zonghai et al. reported on the alignment of CdSe and CdTe NRs along the applied electric field and the accumulation of NRs near the electrodes after drop-casting from a solution. 17 Ryan et al. used a combination of a DC electric field and the slow evaporation of toluene to generate superlattices of semiconductor nanorods with orientation perpendicular to the substrate. ...
... Based on this analysis it can be concluded that at low liquid elevation, the submerged particles experience strong lateral and vertical capillary forces due to a large 'capillary charge' that causes strong interaction. Similar conclusion was reported by Peyrade et al. [19]. Using the current expressions for calculating the VCF and LCF via the macroscopic parameters, the conversion time with the necessary numerical calculations can delay the simulation significantly . ...
... The structure of a trilayer stack consists of a bottom polymer, a middle layer and a top polymer layer. The bottom polymer is usually PMMA followed by the middle layer made of titanium or germanium [25]. The top layer is photosensitive resist, acrylate oligomers or polyester amide depending on the manufacturing technology [22,26]. ...
... In this work, microelectronic fabrication technology is applied for the development of the nanoelectrode based biosensor. Processes such as photolithography and thermal processes like oxidation and deposition are used to make dedicated design on top of silicon wafer surface [5][6][7]. This paper is mainly focused on the thermal processes and thickness inspection on certain layers. ...
... Tackling these problems is accelerated by application of the atomic force microscopy (AFM) [7]. AFM enables relatively fast testing of interfacial properties between pairs of materials. ...
... After seven days in differentiation conditions, we performed immunofluorescence stainings for myosin heavy chain 7, SAA, and nuclei (figures 5(a)-(p)). Then, we used confocal images to calculate the fusion index, which is an indicator of differentiation quality in skeletal muscle cell cultures [74]. As expected, DM1 myoblasts in 2D culture had a significantly lower fusion index than healthy controls. ...