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1. Active microrheology in corrugated channels: Comparison of thermal and colloidal baths

Author:
Paolo Malgaretti; Antonio M. Puertas; Ignacio Pagonabarraga
Source:
Journal of colloid and interface science 2022 v.608 pp. 2694-2702
ISSN:
0021-9797
Subject:
colloids,   etc   ; friction; models;     Show all 3 Subjects
Abstract:
... 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 ...
DOI:
10.1016/j.jcis.2021.10.193

2. Approximate analytic expressions for the diffusiophoretic velocity of a spherical colloidal particle

Author:
Hiroyuki Ohshima
Source:
Electrophoresis 2022 v.43 no.5-6 pp. 752-756
ISSN:
0173-0835
Subject:
colloids,   etc   ; electrolytes; electrophoresis;     Show all 3 Subjects
Abstract:
... 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 ...
DOI:
10.1002/elps.202100178

3. Asymmetrical motion of electrically actuated cilium using induced charge electro-osmosis with asymmetrical joint structure

Author:
Hideyuki Sugioka; Koshi Ueno
Source:
Colloids and surfaces 2022 v.644 pp. 128833
ISSN:
0927-7757
Subject:
colloids,   etc   ; cilia; stroke; surfaces;     Show all 4 Subjects
Abstract:
... 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 ...
DOI:
10.1016/j.colsurfa.2022.128833

4. Natural convection heat transfer characteristics of sinusoidal cavities filled with nanofluids

Author:
Zhen Tian; Zhibo Tang; Cong Qi; Lanqi Chen; Yuwei Wang
Source:
Colloids and surfaces 2022 v.648 pp. 129309
ISSN:
0927-7757
Subject:
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 ...
DOI:
10.1016/j.colsurfa.2022.129309

5. Classification of static cylindrical menisci confined in a wedge

Author:
Hyungjoo Yim; Jaewook Nam
Source:
Colloids and surfaces 2022 v.634 pp. 127988
ISSN:
0927-7757
Subject:
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 ...
DOI:
10.1016/j.colsurfa.2021.127988

6. Exciton Diffusion and Annihilation in an sp² Carbon-Conjugated Covalent Organic Framework

Author:
Xinzi Zhang; Keyu Geng; Donglin Jiang; Gregory D. Scholes
Source:
Journal of the American Chemical Society 2022 v.144 no.36 pp. 16423-16432
ISSN:
1520-5126
Subject:
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 ...
DOI:
10.1021/jacs.2c04742

7. Self-assembly pathways in a triphenylalanine peptide capped with aromatic groups

Author:
Maria M. Pérez-Madrigal; Ana M. Gil; Jordi Casanovas; Ana I. Jiménez; Lorena P. Macor; Carlos Alemán
Source:
Colloids and surfaces 2022 v.216 pp. 112522
ISSN:
0927-7765
Subject:
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 ...
DOI:
10.1016/j.colsurfb.2022.112522

8. Formation and suppression of secondary cracks in deposits of colloidal ellipsoids

Author:
Sanket Kumar; Hemant Kumar; Madivala G. Basavaraj; Dillip K. Satapathy
Source:
Colloids and surfaces 2022 v.641 pp. 128579
ISSN:
0927-7757
Subject:
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 ...
DOI:
10.1016/j.colsurfa.2022.128579

9. Strong coupling between an inverse bowtie Nano-Antenna and a J-aggregate

Author:
Adam Weissman; Maxim Sukharev; Adi Salomon
Source:
Journal of colloid and interface science 2022 v.610 pp. 438-445
ISSN:
0021-9797
Subject:
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 ...
DOI:
10.1016/j.jcis.2021.12.061

10. Controllable dried patterns of colloidal drops

Author:
Fan Du; Liyuan Zhang; Wei Shen
Source:
Journal of colloid and interface science 2022 v.606 pp. 758-767
ISSN:
0021-9797
Subject:
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 ...
DOI:
10.1016/j.jcis.2021.08.089

11. The role of Laplace pressure in the maximal weight of pendant drops

Author:
Laure Lecacheux; Abdelkrim Sadoudi; Agnès Duri; Véronique Planchot; Thierry Ruiz
Source:
Journal of colloid and interface science 2022 v.606 pp. 920-928
ISSN:
0021-9797
Subject:
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: ...
DOI:
10.1016/j.jcis.2021.08.047

12. The effect of dynamic wetting pressure on contact angle measurements

Author:
Abrar Ahmed; Raymond Sanedrin; Thomas Willers; Prashant R. Waghmare
Source:
Journal of colloid and interface science 2022 v.608 pp. 1086-1093
ISSN:
0021-9797
Subject:
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 ...
DOI:
10.1016/j.jcis.2021.10.003

13. 2D colloids in rotating electric fields: A laboratory of strong tunable three-body interactions

Author:
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
Source:
Journal of colloid and interface science 2022 v.608 pp. 564-574
ISSN:
0021-9797
Subject:
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 ...
DOI:
10.1016/j.jcis.2021.09.116

14. Natural convection in a rectangular tall cavity in the presence of an oscillating and rotating cylinder

Author:
Somayeh Davoodabadi Farahani; Amir Davoodabadi Farahani; Hakan F. Öztop
Source:
Colloids and surfaces 2022 v.647 pp. 129027
ISSN:
0927-7757
Subject:
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 ...
DOI:
10.1016/j.colsurfa.2022.129027

15. Phase stability of colloidal spheres mixed with semiflexible supramolecular polymers

Author:
Vincent F.D. Peters; Remco Tuinier; Mark Vis
Source:
Journal of colloid and interface science 2022 v.608 pp. 644-651
ISSN:
0021-9797
Subject:
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 ...
DOI:
10.1016/j.jcis.2021.09.090

16. Foaming and antifoaming in non-aqueous liquids

Author:
S.G.K. Calhoun; V. Chandran Suja; G.G. Fuller
Source:
Current opinion in colloid & interface science 2022 v.57 pp. 101558
ISSN:
1359-0294
Subject:
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 ...
DOI:
10.1016/j.cocis.2021.101558

17. Accurate determination of viscosity and surface tension by surface light scattering in the presence of a contribution from the rotational flow in the bulk of the fluid

Author:
Thomas M. Koller; Manuel Kerscher; Andreas P. Fröba
Source:
Journal of colloid and interface science 2022 v.626 pp. 899-915
ISSN:
0021-9797
Subject:
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 ...
DOI:
10.1016/j.jcis.2022.06.129

18. Asymmetrical ring-shaped colloidal particles for self-assembly and superhydrophobic coatings

Author:
Zhang Luo; Shanshan Li; Linna Wang; Bing Liu
Source:
Chemical communications 2022 v.58 no.38 pp. 5757-5760
ISSN:
1364-548X
Subject:
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 ...
DOI:
10.1039/d2cc01853e

19. High electrochemical stability of octahedral LiMn2O4 cathode material in aqueous and organic lithium-ion batteries

Author:
Jiaqi Zhao; Meng Shi; Yunhao Wu; Pian Zhang; Xinghua Tan; Xiaohong Kang; Weiguo Chu; Zhilian Wu; Yifei Li
Source:
Colloids and surfaces 2022 v.634 pp. 127932
ISSN:
0927-7757
Subject:
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 ...
DOI:
10.1016/j.colsurfa.2021.127932

20. The high-concentration stable phase: The breakthrough of catanionic surfactant aqueous system

Author:
Shasha Jiang; Weilin Qi; Cheng Ma; Tongyue Wu; Xiaoyu Li; Xingyue Chen; Shuitao Gao; Jinwan Qi; Yun Yan; Jianbin Huang
Source:
Colloids and surfaces 2022 v.648 pp. 129120
ISSN:
0927-7757
Subject:
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 ...
DOI:
10.1016/j.colsurfa.2022.129120