Sorption and Interfacial Rheology Study of Model Asphaltene Compounds

Pradilla, Diego; Simon, Sébastien; Sjöblom, Johan; Samaniuk, Joseph R.; Skrzypiec, Marta; Vermant, Jan

doi:10.1021/acs.langmuir.6b00195

Cited by 67 publications

(88 citation statements)

References 63 publications

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“…We hypothesize that the dynamics of graphitic interfaces are dominated by a competition between agglomerates continuously forming via attractive capillary interactions, and Brownian motion (thermal energy) driving nanometer‐thick particles to detach from agglomerates. Understanding the dynamics of interfacial material at an air–water interface can be insightful and complement similar studies performed at other fluid–fluid interfaces . We expect this work to guide future studies on the dynamics of graphene at heptane‐water interfaces.…”

Section: Introductionmentioning

confidence: 55%

Dynamics of pristine graphite and graphene at an air‐water interface

Goggin

Samaniuk

2018

AIChE Journal

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We examine the dynamics and morphology of graphitic films at an air-water interface in a Langmuir trough by varying interfacial surface coverage, by observing in situ interfacial structure, and by characterizing interfacial structure of depositions on mica substrates. In situ interfacial structure is visualized with Brewster angle microscopy and depositions of the interface are characterized with atomic force microscopy and field-emission scanning electron microscopy. Compression/expansion curves exhibit a monotonically decreasing surface pressure between consecutive compressions, but demonstrate a "rebound" of hysteretic behavior when the interface is allowed to relax between consecutive compressions. This dynamic results from a competition between consolidation of the interface via agglomeration of particles or the stacking of graphene sheets, and a thermally-driven relaxation where nanometer-thick particles are able to overcome capillary interactions. These results are especially relevant to applications where functional films with controlled conductivity and transparency may be produced via liquid-phase deposition methods. V C 2018 American Institute of Chemical Engineers AIChE J, 00: 000-000, 2018 Figure 3. Different microscopy methods used to characterize interfaces at different length scales. From left to right, BAM image at 11 mN/m, AFM image at 3 mN/m, FESEM image at 13 mN/m. [Color figure can be viewed at wileyonlinelibrary.com] AFM images taken from an interface deposited at 3 mN/m after a 15 h relaxation time. Mono-and few-layer graphene sheets are present between large islands of graphitic material. (b) AFM image (left) that reveals few-and mono-layer graphene sheets present at the interface at a surface pressure of 20 mN/m. A corresponding height trace (right) follows the red path indicated in image on the left.Figure 5. Compression curves for graphene interfaces. The upper left plot shows pre-relaxation and post-relaxation compression curves for a 2.5 h relaxation period, and the upper right plot shows the pre-relaxation and postrelaxation compression curves for a 15 h relaxation period. Pre-relaxation curves are plotted with red dashes, post-relaxation curves are plotted with blue dots. The bottom two plots contain the same data, but the postrelaxation curves have been shifted along both axes. The shift factors were obtained "by eye" to overlap the first compressions of the pre-relaxation and post-relaxation curve sets. The inset FESEM images (scale bars: 10 μm) were obtained fromdepositions at low Π (indicated by the black boxes). The images reveal that aggregates are present at all times and are surrounded to different degrees by micron and sub-micron particles. [Color figure can be viewed at wileyonlinelibrary.com] Figure 7. BAM images taken during each of the three compression cycles for both the pre-relaxation and postrelaxation interfaces.White areas indicate graphitic material. All images were taken with the barriers in a fully open state and show the evolution of the interface between cons...

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Section: Introductionmentioning

confidence: 55%

Dynamics of pristine graphite and graphene at an air‐water interface

Goggin

Samaniuk

2018

AIChE Journal

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“…As shown in Figure 3b the superposition is well achieved except for G" at high , which might be overestimated due to the hydrodynamic contribution from the subphase fluid, especially for low viscosity interfaces (i.e. at low , thus G" at 7 mM is not considered for the superposition) The soft glassy rheology (SGR) model can be used to describe the linear viscoelastic dynamics of the interfacial particle layer, and the response is consistent with a range of other interfacially active species including polymers 49 , carbon black particles 50 and asphaltenes 28 , which are the polyaromatic heavy components of crude oil. The SGR model envisions a mesoscopic element scenario of 'particle trapping in a potential well', and the potential well depth represents the yielding energy barrier, which must be exceeded for particles to "hop"…”

Section: Linear Viscoelasticitymentioning

confidence: 99%

Interfacial Particle Dynamics: One and Two Step Yielding in Colloidal Glass

Zhang

Cayre

et al. 2016

Langmuir

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The yielding behaviour of silica nanoparticles partitioned at an air-aqueous interface is reported. Linear viscoelasticity of the particle-laden interface can be retrieved via a timedependent and electrolyte-dependent superposition, and the applicability of the 'soft glassy rheology' (SGR) model is confirmed. With increasing electrolyte concentration a non-ergodic state is achieved with particle dynamics arrested firstly from attraction induced bonding bridges and then from the cage effect of particle jamming, manifesting in a two-step yielding process under large amplitude oscillation strain (LAOS). The Lissajous curves disclose a shear-induced in-cage particle re-displacement within oscillation cycles between the two yielding steps, exhibiting a 'strain softening' transitioning to 'strain stiffening' as the interparticle attraction increases. By varying and the particle spreading concentration, , a variety of phase transitions from fluid-to gel-and glass-like can be unified to construct a state diagram mapping the yielding behaviors from one-step to two-step before finally exhibiting one-step yielding at high and .

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“…In situ characterization of the Langmuir film upon the compression process by a wide variety of techniques [263][264][265][266][267][268][269][270] as surface pressure vs. area per molecule and surface potential vs. area per molecule isotherms, Brewster Angle Microscopy (BAM), ellipsometry, X-ray reflectometry, dilational rheology, Infrared reflection spectroscopy or UV-vis reflection spectroscopy, etc. These techniques provide complementary information for the understanding of the intermolecular interactions in the film; A really large number of different anchor groups can be used in the LB methodology in contrast with the SA method since these groups can be not only chemisorbed but also physisorbed onto the electrode.…”

Section: The Langmuir-blodgett Techniquementioning

confidence: 99%

Nanofabrication Techniques in Large-Area Molecular Electronic Devices

2020

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The societal impact of the electronics industry is enormous—not to mention how this industry impinges on the global economy. The foreseen limits of the current technology—technical, economic, and sustainability issues—open the door to the search for successor technologies. In this context, molecular electronics has emerged as a promising candidate that, at least in the short-term, will not likely replace our silicon-based electronics, but improve its performance through a nascent hybrid technology. Such technology will take advantage of both the small dimensions of the molecules and new functionalities resulting from the quantum effects that govern the properties at the molecular scale. An optimization of interface engineering and integration of molecules to form densely integrated individually addressable arrays of molecules are two crucial aspects in the molecular electronics field. These challenges should be met to establish the bridge between organic functional materials and hard electronics required for the incorporation of such hybrid technology in the market. In this review, the most advanced methods for fabricating large-area molecular electronic devices are presented, highlighting their advantages and limitations. Special emphasis is focused on bottom-up methodologies for the fabrication of well-ordered and tightly-packed monolayers onto the bottom electrode, followed by a description of the top-contact deposition methods so far used.

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Sorption and Interfacial Rheology Study of Model Asphaltene Compounds

Cited by 67 publications

References 63 publications

Dynamics of pristine graphite and graphene at an air‐water interface

Dynamics of pristine graphite and graphene at an air‐water interface

Interfacial Particle Dynamics: One and Two Step Yielding in Colloidal Glass

Nanofabrication Techniques in Large-Area Molecular Electronic Devices

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