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1. Simple yield stress fluids

Author:
Frigaard, Ian
Source:
Current opinion in colloid & interface science 2019 v.43 pp. 80-93
ISSN:
1359-0294
Subject:
colloids,   etc   ; fluid mechanics; models;     Show all 3 Subjects
Abstract:
... Recent years have seen a flurry of research on yield stress fluids, approached from different perspectives (physicochemical, rheological and fluid mechanical), considering different length scales and timescales, using a range of tools: experimental, computational and analytical. In this context, it has been common to denigrate the simple models of yield stress fluids for their various acknowledged ...
DOI:
10.1016/j.cocis.2019.03.002

2. Biomolecule displacement by Brownian step

Author:
Gmachowski, Lech
Source:
Colloids and surfaces 2019 v.568 pp. 99-104
ISSN:
0927-7757
Subject:
colloids,   etc   ; diffusivity; models;     Show all 3 Subjects
Abstract:
... Interactions in biological membranes cause the molecular mobility to behave specifically. The random walk of a molecule at short times is not described by the Einstein relation since the character of motion evolves from ballistic to diffusive. This phenomenon is detected because of the long length of the Brownian step which can be comparable to the size of the membrane confined domain and hence ha ...
DOI:
10.1016/j.colsurfa.2019.02.014

3. Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

Author:
Driscoll, Michelle; Delmotte, Blaise
Source:
Current opinion in colloid & interface science 2019 v.40 pp. 42-57
ISSN:
1359-0294
Subject:
colloids,   etc   ; hydrodynamics; mixing;     Show all 3 Subjects
Abstract:
... In this review article, we focus on collective motion in externally driven colloidal suspensions, as well as how these collective effects can be harnessed for use in microfluidic applications. We highlight the leading role of hydrodynamic interactions in the self-assembly, emergent behavior, transport, and mixing properties of colloidal suspensions. A special emphasis is given to recent numerical ...
DOI:
10.1016/j.cocis.2018.10.002

4. Transition from Linear to Circular Motion in Active Spherical-Cap Colloids

Author:
Shelke, Yogesh; Srinivasan, N. R.; Thampi, Sumesh P.; Mani, Ethayaraja
Source:
Langmuir 2019 v.35 no.13 pp. 4718-4725
ISSN:
1520-5827
Subject:
colloids,   etc   ; fuels; hydrogen peroxide;     Show all 3 Subjects
Abstract:
... Nonspherical self-propelling colloidal particles offer many possibilities for creating a variety of active motions. In this work, we report on the transition from linear to circular motion of active spherical-cap particles near a substrate. Self-propulsion is induced by self-diffusiophoresis by catalytic decomposition of hydrogen peroxide (H₂O₂) on one side of the particle. Asymmetric distribution ...
DOI:
10.1021/acs.langmuir.9b00081

5. On the incorrect use and interpretation of the model for colloidal, spherical crystal growth

Author:
Myers, T.G.; Fanelli, C.
Source:
Journal of colloid and interface science 2019 v.536 pp. 98-104
ISSN:
0021-9797
Subject:
colloids,   etc   ; crystals; models;     Show all 3 Subjects
Abstract:
... The standard model for diffusion and surface kinetics driven growth of a single spherical particle in solution is applied incorrectly throughout the literature. This leads to inaccurate values for parameter values, such as the diffusion and surface kinetics coefficients. The model cannot even distinguish between diffusion or surface kinetics driven growth.It is shown that crystal growth occurs in ...
DOI:
10.1016/j.jcis.2018.10.042

6. Characterization on magnetophoretic velocity of the cluster of submicron-sized composite particles applicable to magnetic separation and purification

Author:
Kohama, Natsuki; Suwabe, Chika; Ishii, Haruyuki; Hayashi, Kumiko; Nagao, Daisuke
Source:
Colloids and surfaces 2019 v.568 pp. 141-146
ISSN:
0927-7757
Subject:
colloids,   etc   ; magnetic fields; magnetic separation;     Show all 3 Subjects
Abstract:
... Submicron-sized magnetic composite particles with low polydispersity were prepared to examine the relation between the magnetophoretic velocity and the clustering state of composite particles under application of magnetic field. Five different magnetic composite particles in a size range of 70–470 nm were employed to measure the magnetophoretic velocity. Since the smallest composite particles had ...
DOI:
10.1016/j.colsurfa.2019.02.011

7. Active structuring of colloids through field-driven self-assembly

Author:
Liljeström, Ville; Chen, Chen; Dommersnes, Paul; Fossum, Jon Otto; Gröschel, André H.
Source:
Current opinion in colloid & interface science 2019 v.40 pp. 25-41
ISSN:
1359-0294
Subject:
colloids,   etc   ; anisotropy; isotropy; magnetism; microparticles;     Show all 5 Subjects
Abstract:
... In recent years self-assembly has become progressively more “active”, i.e. the focus of research gradually has shifted towards field-manipulation of matter in order to form temporary states rather than creating static architectures. The desire for time-programmed control of materials certainly originates from the unmatched complexity of natural systems that orchestrate multiple components across l ...
DOI:
10.1016/j.cocis.2018.10.008

8. Activity-Enhanced Self-Assembly of a Colloidal Kagome Lattice

Author:
Mallory, Stewart A.; Cacciuto, Angelo
Source:
Journal of the American Chemical Society 2019 v.141 no.6 pp. 2500-2507
ISSN:
1520-5126
Subject:
colloids,   etc   ; computer simulation; hydrophobicity; nanoparticles;     Show all 4 Subjects
Abstract:
... Here, we describe a method for the enhanced self-assembly of triblock Janus colloids targeted to form a kagome lattice. Using computer simulations, we demonstrate that the formation of this elusive structure can be significantly improved by self-propelling or activating the colloids along the axis connecting their hydrophobic hemispheres. The process by which metastable aggregates are destabilized ...
DOI:
10.1021/jacs.8b12165

9. Self-assembly of ellipsoidal particles at fluid-fluid interfaces with an empirical pair potential

Author:
Luo, Alan M.; Vermant, Jan; Ilg, Patrick; Zhang, Zhenkun; Sagis, Leonard M.C.
Source:
Journal of colloid and interface science 2019 v.534 pp. 205-214
ISSN:
0021-9797
Subject:
colloids,   etc   ; contact angle; microstructure; models;     Show all 4 Subjects
Abstract:
... Colloidal particles adsorbed at fluid-fluid interfaces interact via mechanisms that can be specific to the presence of interfaces, for instance, lateral capillary interactions induced by nonspherical particles. Capillary interactions are highly relevant for self-assembly and the formation of surface microstructures, however, these are very challenging to model due to the multibody nature of capill ...
DOI:
10.1016/j.jcis.2018.08.114

10. Assembly of silica rods into tunable branched living nanostructures mediated by coalescence of catalyst droplets

Author:
Cai, Chunhua; Ge, Yinbiao; Lin, Jiaping; Xu, Zhanwen; Gao, Hongbing; Xu, Wenheng
Source:
Chemical communications 2019 v.55 no.30 pp. 4391-4394
ISSN:
1364-548X
Subject:
colloids,   etc   ; catalysts; chemical reactions; droplets; nanomaterials; silica;     Show all 6 Subjects
Abstract:
... Branched nanostructures with tunable arm numbers were prepared through the assembly of silica rods mediated by coalescence of catalyst droplets on the end of the rods. The formed primary branched colloids retain living characteristics similar to the original ones, that is, they can further assemble into multilevel and hierarchical branched structures. ...
DOI:
10.1039/c9cc00959k

11. Dancing performance of organic droplets in aqueous surfactant solutions

Author:
Čejková, Jitka; Schwarzenberger, Karin; Eckert, Kerstin; Tanaka, Shinpei
Source:
Colloids and surfaces 2019 v.566 pp. 141-147
ISSN:
0927-7757
Subject:
colloids,   etc   ; droplets; liquids; sodium dodecyl sulfate; surfactants;     Show all 5 Subjects
Abstract:
... Droplet systems remain the subject of a constant fascination in science and technology. Here we focus on organic droplets floating on the surface of aqueous surfactant solutions. These droplets can exhibit intriguing interactions. Recently we have found independently in two laboratories that we can observe almost the same complex collective behaviour in two different droplet systems. The aim of th ...
DOI:
10.1016/j.colsurfa.2019.01.027

12. Responsive hydrogel colloids: Structure, interactions, phase behavior, and equilibrium and nonequilibrium transitions of microgel dispersions

Author:
Brijitta, J.; Schurtenberger, P.
Source:
Current opinion in colloid & interface science 2019 v.40 pp. 87-103
ISSN:
1359-0294
Subject:
colloids,   etc   ; crosslinking; dispersions; hydrogels; microgels; polymers;     Show all 6 Subjects
Abstract:
... Soft and responsive colloids based on polymer hydrogels have moved into the focus of the colloid community. This review gives a brief overview of the recent literature on the structure and phase behavior of neutral and ionic poly(N-isopropylacrylamide) microgel dispersions from dilute to over-packed conditions, focusing in particular on the ability of these particles to adapt their size and shape ...
DOI:
10.1016/j.cocis.2019.02.005

13. Rotation and Retention Dynamics of Rod-Shaped Colloids with Surface Charge Heterogeneity in Sphere-in-Cell Porous Media Model

Author:
Li, Ke; Ma, Huilian
Source:
Langmuir 2019 v.35 no.16 pp. 5471-5483
ISSN:
1520-5827
Subject:
colloids,   etc   ; energy; hydrodynamics; models; porous media; torque;     Show all 6 Subjects
Abstract:
... Colloid surface charge heterogeneity was incorporated into a three-dimensional trajectory model, which simulated particle translation and rotation via a force/torque analysis, to study the transport and retention dynamics of rod-shaped colloids over a wide size range in porous media under unfavorable conditions (energy barriers to deposition exist). Our previous study Li, K.; Ma, H.Deposition Dyna ...
DOI:
10.1021/acs.langmuir.9b00748

14. Langmuir–Blodgett technique for anisotropic colloids: Young investigator perspective

Author:
Li, Tao; Lilja, Kaisa; Morris, Ryan J.; Brandani, Giovanni B.
Source:
Journal of colloid and interface science 2019 v.540 pp. 420-438
ISSN:
0021-9797
Subject:
colloids,   etc   ; adsorption; anisotropy; liquids; proteins; rheological properties;     Show all 6 Subjects
Abstract:
... Langmuir-Blodgett (LB) technique, which involves the formation of interfacial layers and the subsequent transfer onto a solid substrate, provides one of the most versatile means to characterize the adsorption, self-assembly, and rheological properties of interfacial colloids. In this review, we summarized the relevant studies on anisotropic colloids, which exhibit a richer self-assembly potential ...
DOI:
10.1016/j.jcis.2019.01.044

15. Convectively Assembled Monolayers of Colloidal Cubes: Evidence of Optimal Packings

Author:
Meijer, Janne-Mieke; Meester, Vera; Hagemans, Fabian; Lekkerkerker, H.N.W.; Philipse, Albert P.; Petukhov, Andrei V.
Source:
Langmuir 2019 v.35 no.14 pp. 4946-4955
ISSN:
1520-5827
Subject:
colloids,   etc   ; algorithms; evaporation; scanning electron microscopy; solvents;     Show all 5 Subjects
Abstract:
... We employ a system of cubic colloids with rounded corners to study the close-packed monolayers that form via convective assembly. We show that by controlled solvent evaporation large densely packed monolayers of colloidal cubes are obtained. Using scanning electron microscopy and particle-tracking algorithms, we investigate the local order in detail and show that the obtained monolayers possess th ...
DOI:
10.1021/acs.langmuir.8b04330

16. Crucial role of the hydroxyl group orientation in Langmuir monolayers organization–The case of 7-hydroxycholesterol epimers

Author:
Wnętrzak, Anita; Chachaj-Brekiesz, Anna; Janikowska-Sagan, Maria; Fidalgo Rodriguez, Jose Luis; Miñones Conde, Jose; Dynarowicz-Latka, Patrycja
Source:
Colloids and surfaces 2019 v.563 pp. 330-339
ISSN:
0927-7757
Subject:
colloids,   etc   ; diastereomers; moieties; oxidation; oxysterols; temperature;     Show all 6 Subjects
Abstract:
... Oxysterols, which are products of cholesterol oxidation, are important biological molecules. For our investigations we have selected two epimers: 7α-hydroxycholesterol (7α-OH) and 7 β-hydroxycholesterol (7β-OH). Both molecules have been found to be capable of stable Langmuir monolayer formation, however, the characteristic of their monolayers were quite different. Contrary to 7β -OH, which isother ...
DOI:
10.1016/j.colsurfa.2018.12.025

17. Influence of framework and interlayer on the colloidal stability of design swelling high-charged micas

Author:
Osuna, Francisco J.; Cota, Agustín; Fernández, Mariela A.; Pavón, Esperanza; Torres Sánchez, Rosa M.; Alba, María D.
Source:
Colloids and surfaces 2019 v.561 pp. 32-38
ISSN:
0927-7757
Subject:
colloids,   etc   ; cations; mica; pH; zeta potential;     Show all 5 Subjects
Abstract:
... Stability of colloidal clay minerals dispersion of fundamental in many industrial processes. Therefore, surface charge of the synthetic swelling high-charged mica family, Na-Mica-n (n = 2 or 4, n is the total layer charge) were investigated to study its colloidal dispersion stability as a function of the framework and interlayer space composition. Na-Mica-n (n = 2 or 4) micas were synthesized and ...
DOI:
10.1016/j.colsurfa.2018.09.086

18. Fractions and colloidal distribution of arsenic associated with iron oxide minerals in lead-zinc mine-contaminated soils: Comparison of tailings and smelter pollution

Author:
Ma, Jie; Lei, Mei; Weng, Liping; Li, Yongtao; Chen, Yali; Islam, Md Shafiqul; Zhao, Junying; Chen, Tongbin
Source:
Chemosphere 2019 v.227 pp. 614-623
ISSN:
0045-6535
Subject:
colloids; soil colloids,   etc   ; arsenic; iron; iron oxides; mine tailings; mining; pH; polluted soils; pollution; runoff;     Show all 11 Subjects
Abstract:
... The mining and smelting of lead-zinc (Pb-Zn) ores cause widespread As contamination. The fractions and colloidal distribution of As associated with Fe oxide minerals in Pb-Zn mine-contaminated soils have not been well understood. In this study, As fractions associated with Fe oxide minerals in Pb-Zn tailings- and smelter-contaminated soils were compared using sequential extraction techniques. Kine ...
DOI:
10.1016/j.chemosphere.2019.04.030

19. Disulfide-based PEGylated prodrugs: Reconversion kinetics, self-assembly and antitumor efficacy B Biointerfaces

Author:
Xie, Zichen; Song, Jianfeng; Zhang, Heng; Zhuang, Yifei; Xie, Shenqi; Li, Yongliang; Li, Zhimin; Liu, Mei; Sun, Keyu
Source:
Colloids and surfaces 2018 v.172 pp. 414-422
ISSN:
0927-7765
Subject:
colloids,   etc   ; drugs; enzymes; nanoparticles;     Show all 4 Subjects
Abstract:
... The prodrug strategy serves well in drug formulation and delivery. Two disulfide-based PEGylated prodrugs were developed and the drug reconversion upon different conditions were studied in detail. The reconversion-induced oversaturation phenomenon was firstly reported here. We found the prodrug can co-assemble with parent drug via π-π stacking into well-defined nanoparticles. The PEG layer of the ...
DOI:
10.1016/j.colsurfb.2018.08.068

20. Interaction of nanoparticles with biological systems B Biointerfaces

Author:
Gehr, Peter
Source:
Colloids and surfaces 2018 v.172 pp. 395-399
ISSN:
0927-7765
Subject:
colloids,   etc   ; nanoparticles; powders; risk;     Show all 4 Subjects
Abstract:
... I feel very much honored that I was invited to contribute to a special issue for you, Heiri, in the prestigious Journal Colloids and Surfaces B: Biointerfaces. Moreover, it is with great pleasure that I add a few pages on the topic I was involved with during my active research time, i.e. on the interaction of nanoparticles with biological systems, for this special issue. The research topic continu ...
DOI:
10.1016/j.colsurfb.2018.08.023