Jerome Claracq - Academia.edu (original) (raw)
Papers by Jerome Claracq
Es wird ein Verfahren zur Herstellung von Silber-Nanodrahten bereitgestellt, umfassend: Bereitste... more Es wird ein Verfahren zur Herstellung von Silber-Nanodrahten bereitgestellt, umfassend: Bereitstellen einer Silbertintenkernkomponente, die ≥ 60 Gew.-% Silber-Nanoteilchen enthalt, die in einem Silbertrager dispergiert sind, Bereitstellen einer Hullenkomponente, die ein filmbildendes Polymer enthalt, das in einem Hullentrager dispergiert ist, Bereitstellen eines Substrats, gemeinsames Elektroverspinnen der Silbertintenkernkomponente und der Hullenkomponente, wobei auf dem Substrat eine Kern-Hulle-Faser mit einem Kern und einer Hulle, die den Kern umgibt, abgeschieden wird, wobei die Silber-Nanoteilchen in dem Kern vorliegen, und Behandeln der Silber-Nanoteilchen zur Bildung einer Population von Silber-Nanodrahten, wobei die Population von Silber-Nanodrahten eine durchschnittliche Lange L von ≥ 60 μm aufweist.
There is provided a method of forming a patterned transparent conductor comprising: providing a s... more There is provided a method of forming a patterned transparent conductor comprising: providing a silver ink core component containing silver nano-particles which are dispersed in a silver carrier, providing a shell component which comprises a polymer film-forming, dispersed in a housing support is, providing a substrate, common electrospinning of silver inks core component and the sheath component to form a core-sheath fiber, wherein the silver nanoparticles are in the core, depositing the core-sheath fibers on the substrate, selectively treating a portion the deposited core-sheath fiber for providing a patterned transparent conductor, wherein the patterned transparent conductor comprising a treated portion and an untreated portion wherein said treated portion includes a plurality of electrically interconnected silver Mini wires and wherein the behan punched area is an electrically conductive region, and wherein the untreated area is an electrically insulating region.
There is provided a process for the preparation of a silver-wire Mini film, wherein the film has ... more There is provided a process for the preparation of a silver-wire Mini film, wherein the film has a reduced surface resistance.
CRC Press eBooks, Jun 21, 2024
The difference in thermoforming processability of three STYRON high-impact polystyrene (HIPS) res... more The difference in thermoforming processability of three STYRON high-impact polystyrene (HIPS) resins was investigated. Experiments were performed on a moldbottle thermoformer as well as a step-case tool thermoformer. Disparities observed were analyzed in terms of differences in rheological properties of the resins. Conclusions were drawn as to which rheological characteristics the resins should possess in order to give the largest temperature processing window coupled with high quality thermoformed parts.
Langmuir, Apr 3, 2002
Several fluorescence techniques have been applied to characterize the aggregates of styrene-malei... more Several fluorescence techniques have been applied to characterize the aggregates of styrene-maleic anhydride copolymers (SMA). The formation of hydrophobic microdomains was confirmed by monitoring the I1/I3 ratios of pyrene dissolved in SMA solutions. Fluorescence quenching experiments indicate that protective quenching is occurring. The excimer-to-monomer ratio of di(1-pyrenylmethyl) ether and stoppedflow fluorescence measurements show that the interior of these SMA aggregates is extremely rigid, much more than that of typical surfactant micelles. Fluorescence anisotropy was applied to determine the hydrodynamic radius of these aggregates which was found to equal 1.7 ( 0.2 nm, in qualitative agreement with earlier measurements by small-angle X-ray scattering and small-angle neutron scattering. SMA aggregates have sizes similar to that of typical surfactant micelles, but their interior is frozen.
International Journal of Material Forming, 2008
This paper presents a method to determine the parameters in a polymer constitutive model using da... more This paper presents a method to determine the parameters in a polymer constitutive model using data obtained from a Rheotens experiment. The novelty of the suggested approach is the simultaneous fitting of model parameters to different types of data given by Rheotens, i.e., force-velocity curve, onset of draw resonance and frequency of oscillations. To determine the onset and frequency of oscillations, a stability analysis is exploited and the spectrum of a quasi-hyperbolic differential operator is calculated. The proposed approach is efficient and accurate. To demonstrate its applicability and consistency, a modified Giesekus constitutive model is chosen and model parameters are fitted to the Rheotens data for three different types of polymer (LLDPE, PP, PS).
Electrorheological Fluids and Magnetorheological Suspensions - Proceedings of the Eighth International Conference, 2002
The behavior of MR fluids involved in industrial devices is often modeled by analogical models wh... more The behavior of MR fluids involved in industrial devices is often modeled by analogical models which do no link the parameters with the physical properties of the fluid. From the equations of fluid mechanics, we give a physical meaning to parameters such as friction, elastic and mass coefficients used in the mentioned models. The predictions are checked with experimental data which mimic the behavior of devices such as antiseismic systems. The viscoelastic behavior of MR fluids is characterized by mechanical spectroscopy. The complex shear modulus G*(omega) contains all the information about the restoring and viscous forces. For example, the relation between elastic modulus, yield stress and magnetic force is discussed in terms of strain amplitude.
Langmuir, 2002
Several fluorescence techniques have been applied to characterize the aggregates of styrene-malei... more Several fluorescence techniques have been applied to characterize the aggregates of styrene-maleic anhydride copolymers (SMA). The formation of hydrophobic microdomains was confirmed by monitoring the I1/I3 ratios of pyrene dissolved in SMA solutions. Fluorescence quenching experiments indicate that protective quenching is occurring. The excimer-to-monomer ratio of di(1-pyrenylmethyl) ether and stoppedflow fluorescence measurements show that the interior of these SMA aggregates is extremely rigid, much more than that of typical surfactant micelles. Fluorescence anisotropy was applied to determine the hydrodynamic radius of these aggregates which was found to equal 1.7 ( 0.2 nm, in qualitative agreement with earlier measurements by small-angle X-ray scattering and small-angle neutron scattering. SMA aggregates have sizes similar to that of typical surfactant micelles, but their interior is frozen.
Journal of Non-newtonian Fluid Mechanics, 2008
The important industrial process of casting polymeric films suffers from the “draw resonance” ins... more The important industrial process of casting polymeric films suffers from the “draw resonance” instability that appears as sudden oscillations in the product dimensions. This instability influences the quality of the end-product and negatively limits productivity and efficiency of the process. The draw resonance originates when a material is being processed beyond the limits of its intrinsic properties. Research is conducted with the intention to find those process and material properties that allow to optimize the production process while keeping it stable.This paper concentrates on a non-isothermal analysis of the stability of the film casting. The mathematical model of the process is given by a quasi-linear system of first order PDEs with two point boundary conditions. The constitutive polymer behavior is approximated by the modified Giesekus model. Linear stability analysis combined with the Laplace transformation of the resulting linear system is applied to find parameters that determine mathematical and thus process instability. It all comes down to determining the spectrum of a compact operator; corresponding eigenfunctions can be regarded as the characteristic modes of the system. For implementation, the modification of Galerkin approach is used. The major advantage of the mathematical and numerical method is that the full spectrum is calculated in a matter of seconds. Our results agree perfectly with the ones from literature for isothermal case, and with the experimental data for the non-isothermal case. The results also indicate that non-isothermality is highly important and cannot be excluded from modeling.
Rheologica Acta, 2004
We have studied the rheological properties of some magnetorheological fluids (MRF). MRF are known... more We have studied the rheological properties of some magnetorheological fluids (MRF). MRF are known to exhibit original rheological properties when an external magnetic field is applied, useful in many applications such as clutches, damping devices, pumps, antiseismic protections, etc. While exploiting parameters such as magnetic field intensity, particle concentration and the viscosity of the suspending fluid, we highlighted the importance of each one of these parameters on rheology in the presence of a magnetic field. We made this study by conducting rheological experiments in dynamic mode at very low strain which facilitates the comprehension of the influence of the structure on MRF rheology. Our results confirmed the link between the magnetic forces which ensure the cohesion of the particles in aggregates, and the elastic modulus. Moreover, we found that the loss modulus varies with the frequency in a similar manner than the elastic modulus. The system, even with the smallest deformations, was thus not purely elastic but dissipates also much energy. Moreover, we demonstrated that this dissipation of energy was not due to the matrix viscosity. Actually, we attributed viscous losses to particle movements within aggregates.
Es wird ein Verfahren zur Herstellung von Silber-Nanodrahten bereitgestellt, umfassend: Bereitste... more Es wird ein Verfahren zur Herstellung von Silber-Nanodrahten bereitgestellt, umfassend: Bereitstellen einer Silbertintenkernkomponente, die ≥ 60 Gew.-% Silber-Nanoteilchen enthalt, die in einem Silbertrager dispergiert sind, Bereitstellen einer Hullenkomponente, die ein filmbildendes Polymer enthalt, das in einem Hullentrager dispergiert ist, Bereitstellen eines Substrats, gemeinsames Elektroverspinnen der Silbertintenkernkomponente und der Hullenkomponente, wobei auf dem Substrat eine Kern-Hulle-Faser mit einem Kern und einer Hulle, die den Kern umgibt, abgeschieden wird, wobei die Silber-Nanoteilchen in dem Kern vorliegen, und Behandeln der Silber-Nanoteilchen zur Bildung einer Population von Silber-Nanodrahten, wobei die Population von Silber-Nanodrahten eine durchschnittliche Lange L von ≥ 60 μm aufweist.
There is provided a method of forming a patterned transparent conductor comprising: providing a s... more There is provided a method of forming a patterned transparent conductor comprising: providing a silver ink core component containing silver nano-particles which are dispersed in a silver carrier, providing a shell component which comprises a polymer film-forming, dispersed in a housing support is, providing a substrate, common electrospinning of silver inks core component and the sheath component to form a core-sheath fiber, wherein the silver nanoparticles are in the core, depositing the core-sheath fibers on the substrate, selectively treating a portion the deposited core-sheath fiber for providing a patterned transparent conductor, wherein the patterned transparent conductor comprising a treated portion and an untreated portion wherein said treated portion includes a plurality of electrically interconnected silver Mini wires and wherein the behan punched area is an electrically conductive region, and wherein the untreated area is an electrically insulating region.
There is provided a process for the preparation of a silver-wire Mini film, wherein the film has ... more There is provided a process for the preparation of a silver-wire Mini film, wherein the film has a reduced surface resistance.
CRC Press eBooks, Jun 21, 2024
The difference in thermoforming processability of three STYRON high-impact polystyrene (HIPS) res... more The difference in thermoforming processability of three STYRON high-impact polystyrene (HIPS) resins was investigated. Experiments were performed on a moldbottle thermoformer as well as a step-case tool thermoformer. Disparities observed were analyzed in terms of differences in rheological properties of the resins. Conclusions were drawn as to which rheological characteristics the resins should possess in order to give the largest temperature processing window coupled with high quality thermoformed parts.
Langmuir, Apr 3, 2002
Several fluorescence techniques have been applied to characterize the aggregates of styrene-malei... more Several fluorescence techniques have been applied to characterize the aggregates of styrene-maleic anhydride copolymers (SMA). The formation of hydrophobic microdomains was confirmed by monitoring the I1/I3 ratios of pyrene dissolved in SMA solutions. Fluorescence quenching experiments indicate that protective quenching is occurring. The excimer-to-monomer ratio of di(1-pyrenylmethyl) ether and stoppedflow fluorescence measurements show that the interior of these SMA aggregates is extremely rigid, much more than that of typical surfactant micelles. Fluorescence anisotropy was applied to determine the hydrodynamic radius of these aggregates which was found to equal 1.7 ( 0.2 nm, in qualitative agreement with earlier measurements by small-angle X-ray scattering and small-angle neutron scattering. SMA aggregates have sizes similar to that of typical surfactant micelles, but their interior is frozen.
International Journal of Material Forming, 2008
This paper presents a method to determine the parameters in a polymer constitutive model using da... more This paper presents a method to determine the parameters in a polymer constitutive model using data obtained from a Rheotens experiment. The novelty of the suggested approach is the simultaneous fitting of model parameters to different types of data given by Rheotens, i.e., force-velocity curve, onset of draw resonance and frequency of oscillations. To determine the onset and frequency of oscillations, a stability analysis is exploited and the spectrum of a quasi-hyperbolic differential operator is calculated. The proposed approach is efficient and accurate. To demonstrate its applicability and consistency, a modified Giesekus constitutive model is chosen and model parameters are fitted to the Rheotens data for three different types of polymer (LLDPE, PP, PS).
Electrorheological Fluids and Magnetorheological Suspensions - Proceedings of the Eighth International Conference, 2002
The behavior of MR fluids involved in industrial devices is often modeled by analogical models wh... more The behavior of MR fluids involved in industrial devices is often modeled by analogical models which do no link the parameters with the physical properties of the fluid. From the equations of fluid mechanics, we give a physical meaning to parameters such as friction, elastic and mass coefficients used in the mentioned models. The predictions are checked with experimental data which mimic the behavior of devices such as antiseismic systems. The viscoelastic behavior of MR fluids is characterized by mechanical spectroscopy. The complex shear modulus G*(omega) contains all the information about the restoring and viscous forces. For example, the relation between elastic modulus, yield stress and magnetic force is discussed in terms of strain amplitude.
Langmuir, 2002
Several fluorescence techniques have been applied to characterize the aggregates of styrene-malei... more Several fluorescence techniques have been applied to characterize the aggregates of styrene-maleic anhydride copolymers (SMA). The formation of hydrophobic microdomains was confirmed by monitoring the I1/I3 ratios of pyrene dissolved in SMA solutions. Fluorescence quenching experiments indicate that protective quenching is occurring. The excimer-to-monomer ratio of di(1-pyrenylmethyl) ether and stoppedflow fluorescence measurements show that the interior of these SMA aggregates is extremely rigid, much more than that of typical surfactant micelles. Fluorescence anisotropy was applied to determine the hydrodynamic radius of these aggregates which was found to equal 1.7 ( 0.2 nm, in qualitative agreement with earlier measurements by small-angle X-ray scattering and small-angle neutron scattering. SMA aggregates have sizes similar to that of typical surfactant micelles, but their interior is frozen.
Journal of Non-newtonian Fluid Mechanics, 2008
The important industrial process of casting polymeric films suffers from the “draw resonance” ins... more The important industrial process of casting polymeric films suffers from the “draw resonance” instability that appears as sudden oscillations in the product dimensions. This instability influences the quality of the end-product and negatively limits productivity and efficiency of the process. The draw resonance originates when a material is being processed beyond the limits of its intrinsic properties. Research is conducted with the intention to find those process and material properties that allow to optimize the production process while keeping it stable.This paper concentrates on a non-isothermal analysis of the stability of the film casting. The mathematical model of the process is given by a quasi-linear system of first order PDEs with two point boundary conditions. The constitutive polymer behavior is approximated by the modified Giesekus model. Linear stability analysis combined with the Laplace transformation of the resulting linear system is applied to find parameters that determine mathematical and thus process instability. It all comes down to determining the spectrum of a compact operator; corresponding eigenfunctions can be regarded as the characteristic modes of the system. For implementation, the modification of Galerkin approach is used. The major advantage of the mathematical and numerical method is that the full spectrum is calculated in a matter of seconds. Our results agree perfectly with the ones from literature for isothermal case, and with the experimental data for the non-isothermal case. The results also indicate that non-isothermality is highly important and cannot be excluded from modeling.
Rheologica Acta, 2004
We have studied the rheological properties of some magnetorheological fluids (MRF). MRF are known... more We have studied the rheological properties of some magnetorheological fluids (MRF). MRF are known to exhibit original rheological properties when an external magnetic field is applied, useful in many applications such as clutches, damping devices, pumps, antiseismic protections, etc. While exploiting parameters such as magnetic field intensity, particle concentration and the viscosity of the suspending fluid, we highlighted the importance of each one of these parameters on rheology in the presence of a magnetic field. We made this study by conducting rheological experiments in dynamic mode at very low strain which facilitates the comprehension of the influence of the structure on MRF rheology. Our results confirmed the link between the magnetic forces which ensure the cohesion of the particles in aggregates, and the elastic modulus. Moreover, we found that the loss modulus varies with the frequency in a similar manner than the elastic modulus. The system, even with the smallest deformations, was thus not purely elastic but dissipates also much energy. Moreover, we demonstrated that this dissipation of energy was not due to the matrix viscosity. Actually, we attributed viscous losses to particle movements within aggregates.