{"id":797,"date":"2023-07-06T12:15:59","date_gmt":"2023-07-06T12:15:59","guid":{"rendered":"https:\/\/forgreensoft-test.iesl.forth.gr\/?page_id=797"},"modified":"2026-01-23T08:08:16","modified_gmt":"2026-01-23T08:08:16","slug":"publications","status":"publish","type":"page","link":"https:\/\/forgreensoft.gr\/?page_id=797","title":{"rendered":"Publications"},"content":{"rendered":"\t\t
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Publications<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Friction Measurements with Picoliter Droplets Using Scanning Probe Microscopy<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Diego Cort\u00e9s, Michael Kappl, Hans-J\u00fcrgen Butt, Pranav Sudersan, Tomas P. Corrales<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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https:\/\/doi.org\/10.1103\/s6ln-s593<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Topographical and chemical defects on solid surfaces tend to pin three-phase contact lines of moving liquid drops. Our quantitative understanding of the pinning process is, however, still poor. Here we use an atomic force microscope to slide \u2248100\u2009\u2009pL droplets of water-glycerol mixtures over hydrophobic surfaces and measure friction forces. By using picoliter droplets, the sensitivity for detecting processes at the contact line is enhanced. We have found that only a region <200\u2009\u2009nm around the contact line contributes to friction. By imaging isolated nanospherical defects, we could quantify the force and energy dissipation when the front and rear of the droplet passes the defect and compare it to theory.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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A kinetic model to simulate charge flow through an electro-chemical half-cell<\/h1><\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Diego Veloza-Diaz, Friederike Schmid, Robinson Cortes-Huerto, Pietro Ballone, Nancy C. Forero-Martinez<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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https:\/\/doi.org\/10.1063\/5.0295632<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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A kinetic model of the electron transfer at the electrode\/electrolyte interface is developed, implemented in a Monte Carlo framework, and applied to simulate this process in idealized systems consisting of the primitive model of electrolyte limited by an impenetrable conducting surface. In the present implementation, a charged, spherical interface surrounding an equally spherical sample of electrolyte is introduced to model a single-electrode system, providing the computational analog to the conceptual half-cell picture that is widely used in electrochemistry. The electron transfer itself is described as a simple surface hopping process underlying a first order reaction corresponding to one of the coupled M\/M+<\/sup> and X\u2212<\/sup>\/X half reactions. Then, the electron transfer at the interface is combined with the self-diffusion of ions in the electrolyte, whose role is to supply reagents and disperse products, allowing the system to settle in a stationary non-equilibrium state. Simulations for the primitive model of an electrolyte in contact with a charged impenetrable surface show that, after a brief transient, the samples sustain a steady current through the half-cell. The results quantify the dependence of the current on the overall charge of the electrode, the ionic strength of the electrolyte, its viscosity, and the kinetic parameter k<\/em>e<\/em><\/sub>, which represents the rate of the electron transfer for each ion in contact with the electrode. Since the simulated interface is very idealized, strategies to overcome the limitations of the present model are outlined and briefly discussed.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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ShearView: A compact stress- and strain-controlled linear rheometer for integrated rheomicroscopy<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Nikolaos Kalafatakis, Roberto Cerbino<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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https:\/\/doi.org\/10.1122\/8.0001101<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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We present ShearView<\/em>, a compact, cost-effective, and open-source linear rheometer, that enables both strain- and stress-controlled shear experiments, while being fully compatible with high-resolution optical microscopy. Designed for transparency and modularity, the device integrates mechanical simplicity, dual feedback control, and real-time synchronization of rheological and optical data, thereby enabling a simultaneous investigation of macroscopic mechanical response and microscopic structural dynamics across a wide range of soft matter systems. ShearView is primarily constructed from off-the-shelf components and operated via custom LabVIEW software. Calibration procedures and feedback algorithms allow for the accurate application of arbitrary stress or strain waveforms in both linear and nonlinear regimes. We validate the instrument against a commercial rotational rheometer (Anton Paar MCR 702e), demonstrating excellent agreement in frequency sweeps performed in the linear viscoelastic regime and large-amplitude oscillatory shear for the materials and frequency ranges tested here. In addition, we implement nonstandard rheological protocols, such as chirped oscillations and recovery rheology. We further illustrate the system capabilities through synchronized imaging during echo and shear-cessation protocols, highlighting its potential to link bulk rheological response with underlying microscopic dynamics. All hardware designs, control software, and example datasets are freely available to facilitate reuse, customization, and educational deployment.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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development Of a systematic coarse-grained model for poly(caprolactone) in melt<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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THANASIS ATHANASIOU, MICHELA GERI, PATRICE ROOSE, GARETH H. MCKINLEY AND GEORGE PETEKIDIS<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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https:\/\/doi.org\/10.1122\/8.0000793<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Knowledge of the evolution in the mechanical properties of a curing polymer matrix is of great importance in composite parts or structure fabrication. Conventional rheometry, based on small amplitude oscillatory shear, is limited by long interrogation times. In rapidly evolving materials, time sweeps can provide a meaningful measurement albeit at a single frequency. To overcome this constraint, we utilize a combined frequency- and amplitude-modulated chirped strain waveform in conjunction with a homemade sliding plate piezo-operated rheometer (PZR) and a dual-head commercial rotational rheometer (Anton Paar MCR 702) to probe the linear viscoelasticity of these time-evolving materials. The direct controllability of the PZR, resulting from the absence of any kind of firmware and the microsecond actuator-sensor response renders this device ideal for exploring the advantages of this technique. The high frequency capability allows us to extend the upper limits of the accessible linear viscoelastic spectrum and, most importantly, to shorten the length of the interrogating strain signal (OWCh-PZR) to subsecond scales, while retaining a high time-bandwidth product. This short duration ensures that the mutation number (NMu<\/sub>) is kept sufficiently low, even in fast-curing resins. The method is validated via calibration tests in both instruments, and the corresponding limitations are discussed. As a proof of concept, the technique is applied to a curing vinylester resin. The linear viscoelastic (LVE) spectrum is assessed every 20\u2009s to monitor the rapid evolution in the time and frequency dependence of the complex modulus. Comparison of the chirp implementation, based on parameters such as duration of the experiment, sampling frequency, and frequency range, in a commercial rotational rheometer with the PZR provides further information on the applicability of this technique and its limitations. Finally, FTIR spectroscopy is utilized to gain insights into the evolution of the chemical network, and the gap dependence of the evolving material properties in these heterogeneous systems is also investigated.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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development Of a systematic coarse-grained model for poly(caprolactone) in melt<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Petra Ba\u010dov\u00e1; Gonzalo Gonz\u00e1lez Huarte; Vagelis Harmandaris; Sergio I. Molina<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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10.12688\/openreseurope.21354.1<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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This study introduces a systematic coarse-graining approach to model poly(\u03b5-caprolactone) (PCL) in its melt state. The primary goal is to provide a simple and adaptable method for creating computational models of biodegradable polymers, which can then be used to study materials with a wide range of molecular weights and compositions that are relevant to industry. This research addresses the growing need for sustainable materials across various industrial applications.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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locally tuned hydodynamics of active polymer chains<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Lisa Sappl, Christos N. Likos, Andreas Z\u00f6ttl<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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https:\/\/arxiv.org\/abs\/2508.18789v1<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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We employ mesoscopic simulations to study active polymers in a solvent via multi-particle collision dynamics.<\/p>\n

We investigate linear chains in which either the head or tail monomer exerts an active force, directed away<\/p>\n

from or towards its neighbor, respectively, while the remaining monomers are passive. We find that, in<\/p>\n

contrast to flexible chains, for stiff chains the position of the active monomer has minimal influence on both<\/p>\n

the structural and dynamic properties of the chain. An active head monomer pulls the chain behind it,<\/p>\n

straightening the backbone \u2013 an effect that can be interpreted as activity-induced stiffening. In contrast,<\/p>\n

an active tail pushes into the chain, causing crumpling. This leads to faster decorrelation of the polymer<\/p>\n

backbone over time, rendering the active motion less persistent. These effects occur regardless of whether<\/p>\n

hydrodynamic interactions are included or not. Hydrodynamics is included by the imposition of a local<\/p>\n

counter-force in the surrounding fluid, as opposed to distributing the former equally to all fluid elements.<\/p>\n

By specifying the position of this counterforce onto the fluid, we can tune the hydrodynamic flow fields of<\/p>\n

the active polymers being both contractile and extensile. Interestingly, the emerging pusher- and puller flow<\/p>\n

fields are strongly influenced by the force propagation inside the polymer chain<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Nikolaos A. Burger, Gerhard Meier, Dimitris Vlassopoulos, Benoit Loppinet<\/p>

https:\/\/doi.org\/10.1021\/acs.iecr.4c04861\u00a0<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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We investigated the effects of high hydrostatic pressure on the sol\u2013gel transition of gelatin dispersions. We used dynamic light scattering (DLS) and DLS-based passive microrheology to monitor the evolution of the viscoelasticity during isothermal gelation. It provided easy identification of the sol\u2013gel transition and the isothermal critical gelation time (t<\/i>c<\/sub>) and values of viscosities of sols and shear modulus of gels. At a given temperature, t<\/i>c<\/sub> decreased with increasing pressure. Up to 100 MPa, the temperature dependence of t<\/i>c<\/sub> followed the established empirical rule <\/i>\ud835\udc61<\/span>c<\/span><\/span>\u223c<\/span>(<\/span>1<\/span>\u2212<\/span>\ud835\udc47<\/span>\ud835\udc47<\/span>C<\/span><\/span><\/span>)<\/span><\/span><\/span>\ud835\udc5b<\/span><\/span><\/span><\/span><\/span> and the critical temperature T<\/i>c<\/sub> increased with pressure by \u223c0.04 K\/MPa. The critical gelation time scaled with the quench depth T<\/i>\u2013T<\/i>c<\/sub> or equivalently with the distance from the pressure-dependent collagen denaturation temperature (\u223c314 K, at 0.1 MPa), which also increases by \u223c0.04 K\/MPa in the first 100 MPa. The pressure dependence also reflected on the time evolution of the intrinsic viscosity, \u03b7i<\/i><\/sub>, or elastic modulus, G<\/i>p<\/sub>, in the sol or gel state, respectively, are reported. Both \u03b7i<\/i><\/sub> or G<\/i>P<\/sub> evolution speeds up with pressure. Finally, using a reverse quenching approach, we observed a slowing of the gel melting when the pressure increases. Our results confirmed that the rheological evolution reflects the helix formation process and that pressure stabilizes the helices.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Orthogonal superposition rheometry of soft core-shell microgels<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Bogri Panagiota, Pagani Gabriele, Vermant Jan, Sprakel Joris, Petekidis George<\/p>

https:\/\/doi.org\/10.1007\/s00397-024-01469-5<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The mechanisms of flow in suspensions of soft particles above the glass-transition volume fraction and in the jammed state were probed using orthogonal superposition rheometry (OSR). A small amplitude oscillatory shear flow is superimposed orthogonally onto a steady shear flow, which allows monitoring the viscoelastic spectra of sheared jammed core\u2013shell microgels during flow. The characteristic crossover frequency \u03c9<\/i>c<\/sub>, deduced from the viscoelastic spectrum, provides information about the shear-induced structural relaxation time, which is connected to the microscopic yielding mechanism of cage breaking. The shear rate evolution of the crossover frequency is used to achieve a superposition of all spectra and get a better insight of the flow mechanism. Despite their inherent softness, the hybrid core\u2013shell microgels exhibit similarities with hard sphere-like flow behavior, with the main difference that for the microgels, the transition from a glassy to a jammed state introduces a volume fraction dependence of the scaling of \u03c9<\/i>c<\/sub> with shear rate. We further check the application of the Kramers\u2013Kronig relations on the experimental low strain amplitude OSR data finding a good agreement. Finally, the low frequency response at high strain rates was investigated with open bottom cell geometry, and instrumental limits were identified. Based on these limits, we discuss previous OSR data and findings in repulsive and attractive colloidal glasses and compare them with the current soft particle gels.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Dextran stabilized hematite: a sustainable anode in aqueuous electrolytes<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Sofia Panagiota, Evangelia Vasilaki, Nikos Katsarakis, Dimitra Vernardou, Maria Vamvakaki<\/p>

https:\/\/doi.org\/10.1039\/D4NR04897K<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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During the last decades, the use of innovative hybrid materials in energy storage devices has led to notable advances in the field. However, further enhancement of their electrochemical performance faces significant challenges nowadays, imposed by the materials used in the electrodes and the electrolyte. Such problems include the high solubility of both the organic and the inorganic anode components in the electrolyte as well as the limited intrinsic electronic conductivity and substantial volume variation of the materials during cycling. The present work focuses on the fabrication of novel and sustainable anode electrodes for use in energy storage devices, utilizing cross-linked oxidized dextran (Ox-Dex) as the binder and hematite (\u03b1-Fe2<\/sub><\/small>O3<\/sub><\/small>) cubes as the active component. The ion diffusion mechanism within the anode electrode materials, as well as their cycling stability, were studied via<\/em> cyclic voltammetry measurements, using Li+<\/sup><\/small>, Zn2+<\/sup><\/small> and Al3+<\/sup><\/small> aqueous electrolytes. The hybrid iron oxide electrodes exhibited the highest electrochemical performance in the Al2<\/sub><\/small>(SO4<\/sub><\/small>)3<\/sub><\/small> electrolyte (3000 mA g\u22121<\/sup><\/small>), followed by ZnSO4<\/sub><\/small> (2000 mA g\u22121<\/sup><\/small>) and Li2<\/sub><\/small>SO4<\/sub><\/small> (800 mA g\u22121<\/sup><\/small>).<\/sub><\/small> The differences in the performance of the anodes for the three investigated electrolytes were attributed to the ionic radii of Li+<\/sup><\/small>, Zn2+<\/sup><\/small> and Al3+<\/sup><\/small>, which affect the rate of ion diffusion within the material lattice exhibiting the highest diffusion coefficient of 4.64 \u00d7 10\u22129<\/sup><\/small> cm2<\/sup><\/small> s\u22121<\/sup><\/small> in Al3+<\/sup><\/small>. Notably, the hybrid anodes demonstrated superior cycling performance (with the lowest variance percentage of 1.3% for hybrid compared to 38.1% for the bare in the presence of Zn2+<\/sup><\/small>), underlining the pivotal role of the natural binder. This was attributed to hydrogen bonding interactions, which increase the contact points between the inorganic and polymeric components, resulting in a more uniform network structure. Additionally, the cross-linking of Ox-Dex promotes stability and tolerance to the volume expansion of the electrodes. These results underscore the immense potential of the proposed hybrid electrodes in the field of energy storage<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Probing cage dynamics in concentrated hard-sphere suspensions and glasses with frequency rheometry<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Thanasis Athanasiou, Baicheng Mei, Kenneth S. Schweizer, George Petekidis<\/p>

https:\/\/doi.org\/10.1039\/D4SM01428F<\/strong><\/a><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The cage concept, a central microscopic mechanism for glassy dynamics, has been utilized in concentrated colloidal suspensions to describe a number of phenomena. Here, we probe the evolution of cage formation and shear elasticity with increasing volume fraction in hard sphere suspensions, with emphasis on the short-time dynamics. To this end, we utilize linear viscoelastic (LVE) measurements, by means of conventional rotational rheometers and a home-made HF piezo-rheometer, to probe the dynamic response over a broad range of volume fractions up to the very dense glassy regime in proximity to random close packing. We focus on the LVE spectra and times shorter than those corresponding to the dynamic shear modulus G<\/em>\u2032 plateau, where the system approaches transient localization and cage confinement. At these short times (higher frequencies), a dynamic cage has not yet fully developed and particles are not (strictly) transiently localized. This corresponds to an effective solid-to-liquid transition in the LVE spectrum (dynamic moduli) marked by a high frequency (HF) crossover. On the other hand, as the volume fraction increases caging becomes tighter, particles become more localized, and the onset of the localization time scale becomes shorter. This onset of transient localization to shorter times shifts the HF crossover to higher values. Therefore, the study of the dependence of the HF crossover properties (frequency and moduli) on volume fractions provides direct insights concerning the onset of particle in-cage motion and allows direct comparison with current theoretical models. We compare the experimental data with predictions of a microscopic statistical mechanical theory where qualitative and quantitative agreements are found. Findings include the discovery of microscopic mechanisms for the crossover between the two exponential dependences of the onset of the localization time scale and the elastic shear modulus at high volume fractions as a consequence of emergent many body structural correlations and their consequences on dynamic constraints. Moreover, an analytic derivation of the relationship between the high frequency localized short-time scale and the elastic shear modulus is provided which offers new physical insights and explains why these two variables are experimentally observed to exhibit nearly-identical behaviors.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Nanofilament-Coated Membranes with Enhanced Scaling and Biofouling Resistance for Membrane Distillation<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Mariana D. Sosa, Ivana K. Levy, Hans-J\u00fcrgen Butt, Michael Kappl<\/p>

https:\/\/doi.org\/10.1021\/acsami.5c01758<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Membrane distillation (MD) for water treatment can be applied in high salinity conditions and for treatment of wastewater. Current commercial membranes are made of fluorinated polymers such as polytetrafluoroethylene (PTFE). Here, porous membranes were coated with a silicone nanofilament layer to obtain a superhydrophobic and fluorine-free material. The classical coating procedure involves the use of toluene as a solvent. In this work, n<\/i>-heptane was tested as a less toxic alternative. Different porous membranes were tested as the substrates of the nanofilament coating. The effect of acids, scaling solutions, and biofilm formation was analyzed in comparison to standard PTFE membranes. We demonstrate that superhydrophobic nanofilament-coated poly(ether sulfone) membranes (NF-PES) possess the required antiwetting properties for MD. Moreover, NF-PES membranes have static contact angles between 10 and 20\u00b0 higher than PTFE standard membranes after immersion tests in solutions containing scaling substances, and biofilm grows from 20 to 50%, less in NF-PES than in PTFE<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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How Preparation Protocols Control the Rheology of Organoclay Gels<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Nikolaos A. Burger, Benoit Loppinet, Andrew Clarke, George Petekidis<\/p>

https:\/\/doi.org\/10.1021\/acs.langmuir.5c02052<\/strong><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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We elucidate the effect of preparation conditions on the rheological properties of organophilic clays consisting of platelet-like primary particles, VG69 (trademark of SLB) dispersed in oil, by varying the homogenization rate, homogenization temperature, and amount of added water. We establish that stable, nonsedimenting gel formation requires homogenization temperatures higher than 45 \u00b0C and the addition of a small amount of water during the homogenization stage. Dried organoclay dispersions, on the other hand, do not form stable gels, independent of the homogenization rate and temperature, suggesting the existence of only weak attractions in the absence of water molecules. Water-induced attraction is necessary to form gels, probably through hydrogen bonding between the silanol group of clay particles and water molecules. Moreover, the effect of homogenization temperature is related to the extent of exfoliation during the homogenization stage as confirmed by X-ray scattering. The gel plateau modulus, Gp<\/sub>, is found to increase with clay concentration as GP<\/sub> \u223c cclay<\/sub>3.9<\/sup>, typical of fractal gel networks. More interestingly, a linear increase in the elastic modulus with water concentration is observed over a wide range of water concentrations, while analyzing the effective yield strain deduced from the yield stress and elastic modulus reveals the existence of three regimes. We finally present dynamic state diagrams that clearly indicate the required conditions for the creation of stable gels and demonstrate the importance of controlling the preparation protocols in the formulation of clay dispersions and gels with desirable structural and mechanical properties.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Polymer Thermophoresis by Mesoscale Simulations<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Lisa Sappl, Christos N. Likos and Andreas Z\u00f6ttl<\/p>

https:\/\/doi.org\/10.1021\/acs.macromol.4c01656<\/strong><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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We employ mesoscopic simulations to study the thermophoretic motion of polymers in a solvent via multiparticle collision dynamics (MPCD). As the usual solvent\u2013monomer collision rules employed in MPCD involving polymers fail to cause thermophoresis, we extend the technique by introducing explicit solvent\u2013monomer interactions, while the solvent molecules remain ideal with respect to one another. We find that with purely repulsive polymer\u2013solvent interaction, the polymer exhibits thermophilic behavior, whereas to display thermophobic behavior, the polymer\u2013solvent potential requires the presence of attractions between solvent particles and monomers, in accordance with previous experimental findings. In addition, we observe that the thermophoretic mobility is independent of polymer length in the observed regime, again in agreement with experiments. Finally, we investigate the thermophoretic behavior of block copolymers, demonstrating that the thermophoretic mobility can be obtained by linear interpolation, weighted by the relative lengths of the two blocks.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Tuning the mechanical properties of organophilic clay dispersions: particle composition and preshear history effects<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Nikolaos A. Burger, Benoit Loppinet,\u00a0Andrew Clarke and George Petekidis<\/p>

\u00a0<\/strong>https:\/\/doi.org\/10.1122\/8.0000854<\/strong><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Clay minerals are abundant natural materials used widely in coatings, construction materials, ceramics, as well as being a component of drilling fluids. Here, we present the effect of steady and oscillatory preshear on organophilic modified clay gels in synthetic oil. Both platelet and needle-like particles are used as viscosifiers in drilling fluid formulations. For both particles the plateau modulus exhibits a similar concentration dependence, , whereas the yield strain is\u00a0for the platelets and \u00a0for the needles. Mixtures of the two follow an intermediate behavior: at low concentrations their elasticity and yield strain follows that of needle particles while at higher concentrations it exhibits a weaker power law dependence. Furthermore, upon varying the preshear history, the gel viscoelastic properties can be significantly tuned. At lower (higher) clay concentrations, preshear at specific oscillatory strain amplitudes or steady shear rates, may induce a hardening (softening) of the dispersions and, at all concentrations, a lowering of the shear strain. Hence, in needle dispersions preshear resulted in changes in the volume fraction dependence of the elastic modulus from\u00a0to\u00a0and of the yield strain from\u00a0to. However, small angle X-ray scattering showed not much structural changes, within the q-range covered. Our findings indicate ways to design colloidal organoclay dispersions with a mechanical response that can be tuned at will.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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High-frequency Optimally Windowed Chirp rheometry for rapidly evolving viscoelastic materials: application to a crosslinking thermoset<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Thanasis Athanasiou, Michela Geri, Patrice Roose, Gareth H. McKinley and George Petekidis<\/p>

https:\/\/doi.org\/10.1122\/8.0000793<\/strong><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Knowledge of the evolution of mechanical properties of the curing matrix is of great importance in composite parts or structure fabrication. Conventional rheometry, based on small amplitude oscillatory shear is limited by long interrogation times. In rapidly evolving materials, time sweeps can provide a meaningful measurement albeit at a single frequency. To overcome this constraint we utilize a combined frequency and amplitude-modulated chirped strain waveform in conjunction with a home-made sliding plate piezo-operated (PZR) and a dual-head commercial rotational rheometer (Anton Paar MCR 702) to probe the linear viscoelasticity of these time-evolving materials. The direct controllability of the PZR resulting from the absence of any kind of firmware and the microsecond actuator-sensor response renders this device ideal for exploring the advantages of this technique. The high frequency capability allows us to extend the upper limits of the accessible linear viscoelastic spectrum and most importantly, to shorten the length of the interrogating strain signal (OWCh-PZR) to sub-second scales, while retaining a high time-bandwidth product. This short duration ensures that the mutation number (NMu) is kept sufficiently low, even in fast curing resins. The method is validated via calibration tests in both instruments and the corresponding limitations are discussed. As a proof of concept the technique is applied to a curing vinylester resin. The linear viscoelastic (LVE) spectrum is assessed every 20 seconds to monitor the rapid evolution of the time- and frequency-dependence of the complex modulus. Finally, FTIR spectroscopy is utilized to gain insights on the evolution of the chemical network while the gap-dependence of the evolving material properties in these heterogeneous systems is also investigated.<\/p>\n<\/div>\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\r\n\t\t

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Publications Friction Measurements with Picoliter Droplets Using Scanning Probe Microscopy Diego Cort\u00e9s, Michael Kappl, Hans-J\u00fcrgen Butt, Pranav Sudersan, Tomas P. Corrales https:\/\/doi.org\/10.1103\/s6ln-s593 Topographical and chemical defects on solid surfaces tend to pin three-phase contact lines of moving liquid drops. Our quantitative understanding of the pinning process is, however, still poor. Here we use an atomic […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3876,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"elementor_theme","meta":{"give_campaign_id":0,"site-sidebar-layout":"default","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"unboxed","site-sidebar-style":"unboxed","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"gutenify_custom_css":"","gutenify_custom_css_data":"","footnotes":""},"class_list":["post-797","page","type-page","status-publish","hentry"],"campaignId":"","_links":{"self":[{"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/pages\/797","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=797"}],"version-history":[{"count":204,"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/pages\/797\/revisions"}],"predecessor-version":[{"id":6692,"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/pages\/797\/revisions\/6692"}],"up":[{"embeddable":true,"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=\/wp\/v2\/pages\/3876"}],"wp:attachment":[{"href":"https:\/\/forgreensoft.gr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}