Transition from glass- to gel-like states in clay at a liquid interface

Gholamipour‐Shirazi, Azarmidokht; Carvalho, Márcio S.; Huila, Manuel Fernando Gonzalez; Araki, Koji; Dommersnes, Paul; Fossum, Jon Otto

doi:10.1038/srep37239

Cited by 13 publications

(15 citation statements)

References 45 publications

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“…Two related areas where clay wrapping has been studied and developed are for Pickering emulsion [90] stabilization [91][92][93][94][95] by assembling clay colloidal layers bonded to emulsion drop interfaces by capillary forces (Fig. 9c), and for fabrication of colloidosomes [96] from assemblies of clay layers [97,98] (Fig.…”

Section: Fig 2 Adopted From Supplementary Informationmentioning

confidence: 99%

“…Scale bar is 10 micrometres. (c) Taken from reference[95]: Salt dependent binding of clay assemblies at a liquid drop interface: The drawings are artistic views of a transition from glass-to gel-like states when Laponite clay particles are adsorbed onto a liquid drop interface at two different salt concentrations. The lower image is an experimental observation of the clay assembly at the drop interface using a confocal Raman microscope.…”

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confidence: 99%

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Clay nanolayer encapsulation, evolving from origins of life to future technologies

Fossum

2020

Eur. Phys. J. Spec. Top.

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Clays are the siblings of graphite and graphene/graphene-oxide. There are two basic ways of using clays for encapsulation of sub-micron entities such as molecules, droplets, or nanoparticles, which is either by encapsulation in the interlayer space of clay nanolayered stacked particles (“the graphite way”), or by using exfoliated clay nanolayers to wrap entities in packages (“the graphene way”). Clays maybe the prerequisites for life on earth and can also be linked to the natural formation of other two-dimensional materials such as naturally occurring graphite and its allotropes. Here we discuss state-of-the-art in the area of clay-based encapsulation and point to some future scientific directions and technological possibilities that could emerge from research in this area.

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Section: Fig 2 Adopted From Supplementary Informationmentioning

confidence: 99%

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Clay nanolayer encapsulation, evolving from origins of life to future technologies

Fossum

2020

Eur. Phys. J. Spec. Top.

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“…Smectite clay, graphene oxide (GO), and graphene nanolayers are all examples of 2D materials employed for stabilization of Pickering emulsions − or colloidosomes. − These nanolayers can be produced from bulk materials that delaminate in layers with about 1 nm thick single layer (SGL) for clay and about 0.8 nm for single-layer GO …”

Section: Introductionmentioning

confidence: 99%

Unmodified Clay Nanosheets at the Air–Water Interface

et al. 2020

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Quasi-two-dimensional (2D) nanolayers, such as graphene oxide or clay layers, adhere to gas–liquid or liquid–liquid interfaces. Particularly, clays are of wide general interest in this context because of their extensive and crucial use as Pickering emulsion stabilizers, as well as for their ability to provide colloidosome capsules. So far, clays could only be localized at oil–water or air–saline-water interfaces in aggregated states, while our results now show that clay nanosheets without any modification can be located at air–deionized-water interfaces. The clay mineral used in the present work is synthetic fluorohectorite with a very high aspect ratio and superior quality in homogeneity and charge distribution compared to other clay minerals. This clay mineral is more suitable for achieving unmodified clay anchoring to fluid interfaces compared to other clay minerals used in previous works. In this context, we studied clay nanosheet organization at the air–water interface by combining different experimental methods: Langmuir–Blodgett trough studies, scanning electron microscopy (SEM) studies of film deposits, grazing-incidence X-ray off-specular scattering (GIXOS), and Brewster angle microscopy (BAM). Clay films formed at the air–water interface could be transferred to solid substrates by the Langmuir–Schaefer method. The BAM results indicate a dynamic equilibrium between clay sheets on the interface and in the subphase. Because of this dynamic equilibrium, the Langmuir monolayer surface pressure does not change significantly when pure clay sheets are spread on the liquid surface. However, also, GIXOS results confirm that there are clay nanosheets at the air–water interface. In addition, we find that clay sheets modified by a branched polymer are much more likely to be confined to the interface.

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“…Recently, Shirazi et al [19] have used the pendant drop method to characterize the interface mechanical behavior of a Laponite based Pickering films of the oil drop in water. Laponite is a synthetic smectite clay composed of monodisperse thick disks.The laponite layer behavior changes in the presence of salt due to molecular interactions.…”

Section: Literature Reviewmentioning

confidence: 99%

“…19 The profile of the interface divergent of velocity for the slot coating flow for Capillary number equal 10 −3 and different Boussinesq numbers.…”

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Free Surface Flows With Complex Interfaces

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In my earliest memories, my family is present. By they, I was loved, supported and taught. I learned about character, right and wrong in practice, following their example. When I learned to take my first steps, my family was present. Raising me when I fall. Even today, I feel that in any falling, they will still be around to help me get up. I owe everything to my family. When I needed to take a few steps alone, I found people who made my journey more interesting. With them, I shared moments of joys, sadness, victories, and difficulties. Today, seeing them older and successful, I am touched by today to call them friends. During my graduation at PUC-RIO, I was fortunate to join the LMMP group. What I suppose a milestone in my education and a great stimulus to recover hope and keep dreaming. Here, contributing to this high-performance group I had matured professionally and personally. Thank you, Professor Marcio and Frederico, for this incredible opportunity. Thank you, lab colleagues, for the company and teachings. And finally, I thank PUC-RIO for these 7 years in which I was able to enjoy excellence in the quality of teaching and the scholarships offered by CNPQ and FAPERJ.

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Transition from glass- to gel-like states in clay at a liquid interface

Cited by 13 publications

References 45 publications

Clay nanolayer encapsulation, evolving from origins of life to future technologies

Clay nanolayer encapsulation, evolving from origins of life to future technologies

Unmodified Clay Nanosheets at the Air–Water Interface

Free Surface Flows With Complex Interfaces

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