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... The dynamics of colloidal suspension confined within porous materials strongly differs from that in the bulk. In particular, within porous materials, the presence of boundaries with complex shapes entangles the longitudinal and transverse degrees of freedom inducing a coupling between the transport of the suspension and the density inhomogeneities induced by the walls.Colloidal suspension confined ...
... The general expression is derived for the diffusiophoretic velocity of a spherical colloidal particle of radius a in a concentration gradient of symmetrical electrolyte. On the basis of this expression, simple approximate analytic expressions for the diffusiophoretic velocity correct up to the order of 1/κa is derived, where κ is the Debye‐Hückel parameter. It is found that the approximate express ...
... Asymmetrical motion is essential for a cilium to produce a net flow in a low-Reynolds number regime. Here, we report that electrically actuated cilium having an asymmetrical joint structure shows an asymmetrical motion due to induced charge electro-osmosis (ICEO). In particular, we measured asymmetrical sweep area due to the forward and recovery strokes of our ICEO cilium and evaluated pumping per ...
colloids, etc ; convection; nanofluids; research; surfaces; Show all 5 Subjects
Abstract:
... To improve the heat transfer of free convection of cavity in the field of photothermal conversion and cooling of electronic components, new sinusoidal cavities were developed. The heat transfer properties of Fe₃O₄-H₂O nanofluids in the novel cavities were studied experimentally. The influence of three amplitudes (A=1 mm, A=2 mm, A=3 mm) and three wave numbers (n = 1, n = 2, n = 3), four mass fract ...
colloids, etc ; contact angle; forces; materials; surfaces; Show all 5 Subjects
Abstract:
... In this study, we analyze the shape of a puddle in a plane wedge with a translational symmetry. Under the assumption of equilibrium, where the viscous force is negligible, the shape of the puddle can be approximated as a curve represented as a particular case of Euler’s elastica. For specified geometrical parameter and wetting properties, the shape of the curve is solely determined by a single dim ...
colloids, etc ; absorption; photochemical reactions; spectroscopy; temperature; Show all 5 Subjects
Abstract:
... To optimize the optical and optoelectronic functionalities of two-dimensional (2D) covalent organic frameworks (COFs), detailed properties of emissive and nonradiative pathways after photoexcitation need to be elucidated and linked to particular structural designs. Here, we use transient absorption (TA) spectroscopy to study the colloidal suspension of the full sp² carbon-conjugated sp²c-COF and c ...
colloids, etc ; esters; fields; peptides; surfaces; ultrasonics; Show all 6 Subjects
Abstract:
... Peptide derivatives and, most specifically, their self-assembled supramolecular structures are being considered in the design of novel biofunctional materials. Although the self-assembly of triphenylalanine homopeptides has been found to be more versatile than that of homopeptides containing an even number of residues (i.e. diphenylalanine and tetraphenylalanine), only uncapped triphenylalanine (F ...
colloids, etc ; cracking; drying; evaporation; solids; surfaces; Show all 6 Subjects
Abstract:
... Primary and secondary cracks often coexist in a dried colloidal deposit. While, primary cracks have been the focus of investigation in most of the theoretical and experimental studies, understanding the formation and time evolution of secondary cracks is scarce. In addition, secondary cracks at times are undesirable especially when used as a template in the nano-lithography. Therefore, a control o ...
colloids, etc ; couplings; journals; mathematical models; surfaces; Show all 5 Subjects
Abstract:
... We demonstrate strong coupling between a single or few J-aggregates and an inverse bowtie plasmonic structure, when the J-aggregate is located at a specific axial distance from the metallic surface. Three hybrid modes are clearly observed, witnessing a strong interaction, with a Rabi splitting of up to 290 meV, the precise value of which significantly depends on the orientation of the J-aggregate ...
colloids, etc ; convection; drying; journals; relative humidity; solids; Show all 6 Subjects
Abstract:
... When an aqueous colloidal drop dries on a solid substrate, the final pattern of the dried deposit can be manipulated through controlling the internal flow states of the drop.We report a strategy to control the dried patterns of aqueous colloidal drop by controlling the drop configurations and relative humidity. For this purpose, both sessile and pendant drops are studied.The capillary flow, which ...
colloids, etc ; forces; glass; image analysis; journals; pistons; syringes; Show all 7 Subjects
Abstract:
... Hypothesis: The value of the maximal weight of a pendant drop formed at the end of a syringe needle is lower than the intensity of the corresponding capillary force. The balance of the external forces applied to the maximal pendant drop must be completed by the overpressure generated by the piston of the syringe. Inside the drop, the Laplace pressure corresponds to this overpressure. Experiments: ...
colloids, etc ; contact angle; image analysis; journals; liquids; measurement; Show all 6 Subjects
Abstract:
... The drop deposition technique can impact contact angle measurements. We hypothesized that the drop pinch-off, during the traditionally used pendant drop technique, significantly alters the static contact angle. The capillary waves and dynamic wetting pressure generated during the pendant drop deposition are the source for forced spreading, which can be circumvented by alternative liquid-needle dro ...
Egor V. Yakovlev; Nikita P. Kryuchkov; Sofia A. Korsakova; Nikita A. Dmitryuk; Pavel V. Ovcharov; Mihail M. Andronic; Ilya A. Rodionov; Andrei V. Sapelkin; Stanislav O. Yurchenko
colloids, etc ; electric field; exhibitions; journals; phase transition; proteins; Show all 6 Subjects
Abstract:
... Many-body forces play a prominent role in structure and dynamics of matter, but their role is not well understood in many cases due to experimental challenges. Here, we demonstrate that a novel experimental system based on rotating electric fields can be utilised to deliver unprecedented degree of control over many-body interactions between colloidal silica particles in water. We further show that ...
colloids, etc ; convection; oscillation; porosity; porous media; surfaces; walls; Show all 7 Subjects
Abstract:
... In this paper, the natural convection in a rectangular tall cavity with a rotating and oscillating cylinder is investigated. The amount of heat transfer due to natural convection for the cavity without a cylinder has been compared with previous references, which is in good agreement with previous results. The effect of changing the width of the cavity (1–7 L), cylinder radius (0.05–0.25 L), angula ...
colloids, etc ; exhibitions; journals; mixing; polymers; prediction; temperature; topology; Show all 8 Subjects
Abstract:
... Mixtures of colloids and supramolecular polymers may exhibit stimuli-responsive phase behaviour. However, in theoretical descriptions of such systems, the polymers are commonly described either as flexible chains or as rigid rods, while in experimental systems supramolecular polymers usually fall in between these two limits. We expect the flexibility of the polymers to have a profound effect on th ...
colloids, etc ; attitudes and opinions; foaming; foams; industrial applications; physics; Show all 6 Subjects
Abstract:
... Investigation into the physics of foaming has traditionally been focused on aqueous systems. Non-aqueous foams, by contrast, are not well understood, but have been the subject of a recent surge in interest motivated by the need to manage foaming across industrial applications. In this review, we provide a comprehensive discussion of the current state-of-the-art methods for characterizing non-aqueo ...
colloids, etc ; fluids; journals; light scattering; surface tension; surfaces; viscosity; Show all 7 Subjects
Abstract:
... Near the critical damping of surface fluctuations, surface light scattering (SLS) signals are affected by the rotational flow in the bulk of the fluid. The adequate consideration of this bulk shear mode is essential for a reliable determination of viscosity and surface tension, yet not fully resolved so far. To elucidate the influence of the bulk shear mode on the recorded correlation functions re ...
colloids, etc ; chemical communication; clothing; coatings; contact angle; hydrophobicity; particles; Show all 7 Subjects
Abstract:
... A frame-guided wetting strategy is reported to synthesize highly uniform but asymmetrical colloidal particles from rings to oblate ellipsoids through symmetrical discs, which can self-assemble into diversified highly open 2D superstructures. In particular, ring-shaped particle monolayers have a higher contact angle of water than similar spherical ones, suggesting an attractive particle material fo ...
colloids, etc ; cathodes; crystals; electrochemistry; lithium batteries; materials; solids; surfaces; Show all 8 Subjects
Abstract:
... In this work, octahedral LiMn₂O₄ (O-LMO) with exposed {111} crystal facets was prepared using MnCO₃ as a precursor via solid phase reactions. O-LMO was revealed to have the superior rate performance and good cycling stability in both a three-electrode system and full aqueous batteries with Li₂SO₄ solution.The capacity retentions of 87% for 200 cycles at 0.1 A g⁻¹ and 87% for 500 cycles at 1 A g⁻¹ ...
colloids, etc ; anionic surfactants; cationic surfactants; mixtures; solubilization; surfaces; wills; Show all 7 Subjects
Abstract:
... Precipitates occur readily in the aqueous mixture of cationic and anionic surfactants. We report that the precipitates formed in the catanionic surfactant systems at charge ratios deviated from 1:1 can be solubilized by simply increasing the total surfactant concentrations. At higher concentrations, there are vesicles in the supernatant, which will sequester the monomer surfactant in equilibrium w ...