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1. Shear Flow Behavior of Bidisperse Rodlike Colloids

Author:
Lang, Christian; Lettinga, Minne Paul
Source:
Macromolecules 2020 v.53 no.7 pp. 2662-2668
ISSN:
1520-5835
Subject:
colloids,   etc   ; prediction; viruses; viscosity;     Show all 4 Subjects
Abstract:
... A priori prediction of the flow properties of polydisperse rodlike macromolecules is a prerequisite for the understanding of many industrial and biological processes. Using mixtures of two naturally monodisperse viruses, we create a benchmark bidisperse suspension of rodlike colloids to test the effect of length bidispersity on the shear flow behavior. We find that the zero-shear viscosity is a no ...
DOI:
10.1021/acs.macromol.9b02239

2. Effective interaction between colloids immersed in a polymer blend and their effect on the equation of state of this blend

Author:
Chervanyov, A.I.
Source:
Journal of colloid and interface science 2020 v.563 pp. 156-167
ISSN:
0021-9797
Subject:
colloids,   etc   ; compressibility; equations; polymers;     Show all 4 Subjects
Abstract:
... Owing to the entropic interactions between polymers comprising a blend and surfaces of colloids immersed in this blend, the polymer inter-phases are formed between the colloids and blend. These inter-phases that are non-uniform both in density and composition, mediate the effective interaction between colloids immersed in a polymer blend. We surmise that there is an additional non-osmotic mechanis ...
DOI:
10.1016/j.jcis.2019.12.023

3. Modulation of Central Depletion Zone in Evaporated Sessile Drops via Substrate Heating

Author:
Lama, Hisay; Satapathy, Dillip K.; Basavaraj, Madivala G.
Source:
Langmuir 2020 v.36 no.17 pp. 4737-4744
ISSN:
1520-5827
Subject:
colloids,   etc   ; drying; evaporation; heat; temperature;     Show all 5 Subjects
Abstract:
... In this article, we report the influence of substrate temperature (Tₛᵤb) on the evaporation driven patterning of colloids on solid substrates. When the drops are dried in an environment maintained at temperature, Tₑₙᵥ, lower than Tₛᵤb, the temperature difference between the drop apex and the three-phase contact line leads to thermal Marangoni flow. We show that the interplay between the radial cap ...
DOI:
10.1021/acs.langmuir.0c00785

4. Addressing challenges in the ultrafiltration of biomolecules from complex aqueous environments

Author:
Culfaz-Emecen, P. Zeynep; Bukusoglu, Emre; Koku, Harun; Çulfaz-Emecen, Pınar Zeynep
Source:
Current opinion in colloid & interface science 2020 v.46 pp. 52-64
ISSN:
1359-0294
Subject:
colloids,   etc   ; aquatic environment; proteins; ultrafiltration;     Show all 4 Subjects
Abstract:
... Substantial progress has been made in ultrafiltration processes toward the separation of colloidal species from aqueous environments. Studies, especially in the past decade, have advanced the separations using functional and nanostructured membrane materials and a thorough understanding of colloid–membrane and colloid–colloid interactions in aqueous media. In this context, this review describes th ...
DOI:
10.1016/j.cocis.2020.03.003

5. Self-Assembly of Colloidal Molecules Based on Host–Guest Chemistry and Geometric Constraints

Author:
Kurka, Dustin W.; Niehues, Maximilian; Ravoo, Bart Jan
Source:
Langmuir 2020 v.36 no.14 pp. 3924-3931
ISSN:
1520-5827
Subject:
colloids,   etc   ; geometry; polymers; satellites; silica;     Show all 5 Subjects
Abstract:
... The preparation of colloidal molecules (CMs), that is, clusters of colloids with a defined aggregation number and configuration, is of continued and significant interest in colloid chemistry and materials science and numerous interactions have been utilized to drive their (self-)assembly. However, only very few reports are available on the assembly of CMs based on host–guest chemistry. In this pap ...
DOI:
10.1021/acs.langmuir.9b03891

6. Controlled disassembly of colloidal aggregates confined at fluid interfaces using magnetic dipolar interactions

Author:
Martínez-Pedrero, Fernando; Ortega, Francisco; Codina, Joan; Calero, Carles; Rubio, Ramón G.
Source:
Journal of colloid and interface science 2020 v.560 pp. 388-397
ISSN:
0021-9797
Subject:
colloids,   etc   ; dissociation; magnetic materials; surfaces;     Show all 4 Subjects
Abstract:
... Field induced assembling/disassembling of paramagnetic colloids is strongly influenced by the configuration of the applied field, the surface chemistry of the particles, the nearby presence of an external boundary or the particle density. The trapping of the particles at fluid-fluid interface is expected to promote different assembling/disassembling routes together with new approaches for controll ...
DOI:
10.1016/j.jcis.2019.10.008

7. Bistable colloidal orientation in polar liquid near a charged wall

Author:
Tsori, Yoav
Source:
Journal of colloid and interface science 2020 v.559 pp. 45-50
ISSN:
0021-9797
Subject:
colloids,   etc   ; equations; ions; solvents; torque;     Show all 5 Subjects
Abstract:
... We examine the translation and rotation of an uncharged spheroidal colloid in polar solvents (water) near a charged flat surface. We solve the nonlinear Poisson-Boltzmann equation outside of the colloid in two dimensions for all tilt angles θ with respect to the surface normal. The colloid’s size is assumed to be comparable to the Debye’s length and hence field gradients are essential. The Maxwell ...
DOI:
10.1016/j.jcis.2019.09.096

8. Selected aspects of the state of the art in biomaterials for cardiovascular applications

Author:
Horbett, Thomas A
Source:
Colloids and surfaces 2020 v.191 pp. 110986
ISSN:
0927-7765
Subject:
colloids,   etc   ; biocompatible materials; cardiovascular system; hemostasis; polymers;     Show all 5 Subjects
Abstract:
... A review of selected aspects of biomaterials used for cardiovascular applications is presented in honor of the long-term editorship of John Brash of the journal Colloids and Surfaces B: Biointerfaces. The topics to be discussed include the following: 1. Hemostasis, a high barrier to the use of biomaterials in the cardiovascular system; 2. Newer fundamental studies of protein interactions with surf ...
DOI:
10.1016/j.colsurfb.2020.110986

9. Quantification of Dispersion for Weakly and Strongly Correlated Nanofillers in Polymer Nanocomposites

Author:
McGlasson, Alex; Rishi, Kabir; Beaucage, Gregory; Chauby, Michael; Kuppa, Vikram; Ilavsky, Jan; Rackaitis, Mindaugas
Source:
Macromolecules 2020 v.53 no.6 pp. 2235-2248
ISSN:
1520-5835
Subject:
colloids,   etc   ; models; nanoparticles; polymer nanocomposites; polymers; soot;     Show all 6 Subjects
Abstract:
... The dispersion of nanoparticles in viscous polymers is dictated by kinetics, interaction potentials between particles, and interfacial compatibility between the matrix and dispersed phases. It was previously proposed that an analogy can be made between thermally dispersed colloids and kinetically dispersed nanoparticles in viscous media when weak interactions exist between particles allowing for a ...
DOI:
10.1021/acs.macromol.9b02429

10. Coadsorption of Counterionic Colloids at Fluid Interfaces: A Coarse-Grained Simulation Study of Gibbs Monolayers

Author:
Cuetos, Alejandro; Morillo, Neftali; Martı́nez−Haya, Bruno
Source:
Langmuir 2020 v.36 no.11 pp. 2877-2885
ISSN:
1520-5827
Subject:
colloids,   etc   ; Monte Carlo method; electrostatic interactions; landscapes;     Show all 4 Subjects
Abstract:
... Monolayers of oppositely charged colloids form versatile self-organizing substrates, with a recognized potential to tailor functional interfaces. In this study, a coarse-grained Monte Carlo simulation approach is laid out to assess the structural properties of Gibbs monolayers, in which one of the counterionic species is partially soluble. It is shown that the composition of this type of monolayer ...
DOI:
10.1021/acs.langmuir.9b03886

11. Growing a particle-stabilized aqueous foam

Author:
Tyowua, Andrew T.; Binks, Bernard P.
Source:
Journal of colloid and interface science 2020 v.561 pp. 127-135
ISSN:
0021-9797
Subject:
colloids,   etc   ; aeration; ambient temperature; cooling; foams; heat;     Show all 6 Subjects
Abstract:
... Certain gas-filled colloidal particles expand upon heating. If such particles are surface-active and stabilize aqueous foams, do the foams grow with temperature as particles expand?Aqueous foams were stabilized with hollow micro-spherical particles that are partially wetted by water and grow upon heating. Foams were prepared using two different approaches, both of which led to their growth. In the ...
DOI:
10.1016/j.jcis.2019.11.103

12. Relaxation Dynamics, Softness, and Fragility of Microgels with Interpenetrated Polymer Networks

Author:
Nigro, Valentina; Ruzicka, Barbara; Ruta, Beatrice; Zontone, Federico; Bertoldo, Monica; Buratti, Elena; Angelini, Roberta
Source:
Macromolecules 2020 v.53 no.5 pp. 1596-1603
ISSN:
1520-5835
Subject:
colloids,   etc   ; autocorrelation; hardness; light scattering; microgels; polymers;     Show all 6 Subjects
Abstract:
... Microgels are elastic and deformable particles with a hybrid nature between that of polymers and colloids and unconventional behaviors with respect to hard colloids. We investigated the dynamics of a soft microgel made of interpenetrated polymer networks of PNIPAM and PAAc by means of coherent X-ray and light scattering techniques. By varying the particle softness through the PAAc content, we can ...
DOI:
10.1021/acs.macromol.9b01560

13. Packing structures of colloidal silica particles formed by drying condensed suspensions

Author:
Miyazaki, Hayato; Abe, Kohei; Inasawa, Susumu
Source:
Drying technology 2020 v.38 no.3 pp. 385-394
ISSN:
1532-2300
Subject:
colloids,   etc   ; color; drying; light microscopy; silica;     Show all 5 Subjects
Abstract:
... We investigated the packing structures of silica particles formed by drying colloidal suspensions with various particle volume fractions. We observed many packing domains with different orientations in a film formed from drying a 10 vol% suspension. These domains showed birefringence and were observed as different color domains in optical microscopy images. The size of the packing domains decrease ...
DOI:
10.1080/07373937.2019.1574813

14. Cryo-XPS – A new technique for the quantitative analysis of the structure of electric double layer at colloidal particles?

Author:
Škvarla, Jiří; Kaňuchová, Mária; Shchukarev, Andrey; Girová, Anna; Brezáni, Ivan
Source:
Colloids and surfaces 2020 v.586 pp. 124234
ISSN:
0927-7757
Subject:
colloids,   etc   ; gels; prediction; quantitative analysis; silica; uncertainty;     Show all 6 Subjects
Abstract:
... There is a long-lasting uncertainty as to the structure of the metal oxide/water interface. Various structures have especially been invoked to rationalize the seemingly anomalous silica/water interface. But, none of them seems to be approved in a quantitative and systematic way. We show that the concentration ratio of monovalent counterions and coions around colloidal silica spheres, as detected b ...
DOI:
10.1016/j.colsurfa.2019.124234

15. Numerical study on rheological properties for dispersed and aggregated particle systems

Author:
Udono, Hirotake; Uruga, Kazuyoshi; Tsukada, Takeshi; Sakai, Mikio
Source:
Powder technology 2020 v.361 pp. 203-209
ISSN:
0032-5910
Subject:
colloids,   etc   ; deformation; mathematical models; powders; viscosity;     Show all 5 Subjects
Abstract:
... Shear thinning behavior of colloidal suspensions is a direct consequence of shear-induced structural variation of aggregates. This study numerically simulates the shear-induced deformation of spherical aggregates of particles with close-packed and hollowed-out structures to evaluate its rheological effects on the bulk suspension. Simulations are performed by the discrete element method (DEM) coupl ...
DOI:
10.1016/j.powtec.2019.09.041

16. 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

17. 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

18. 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

19. 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

20. 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