Controlled Exfoliation of Layered Silicate Heterostructures into Bilayers and Their Conversion into Giant Janus Platelets

Stöter, Matthias; Gödrich, Sebastian; Feicht, Patrick; Rosenfeldt, Sabine; Thurn, H.; Neubauer, Jens W.; Seuß, Maximilian; Lindner, Peter; Kalo, Hussein; Möller, Michael W.; Fery, Andreas; Förster, Stephan; Papastavrou, Georg; Breu, Josef

doi:10.1002/ange.201601611

Cited by 12 publications

(9 citation statements)

References 50 publications

(57 reference statements)

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“…When immersed into water, nematic phases of DBLs are obtained within seconds to a few minutes by repulsive osmotic swelling ( Fig. 1B ) ( 46 , 51 ), thus producing structural coloration rapidly. There might be a direct biomimetic analog to this mechanism: Loliginid squids are able to reversibly tune their structural colors by the osmotically driven changes to the Bragg lamellar stacks in the iridocyte cells ( 52 ).…”

Section: Resultsmentioning

confidence: 99%

“…3B ) ( 54 ). Clay nanosheets are strong in-plane but rather soft cross-plane, allowing them to curve or undulate ( 46 , 51 ). Adjacent layers of clay nanosheets in the Bragg stacks that can be turbostratically stacked with random displacement ( 43 ).…”

Section: Resultsmentioning

confidence: 99%

“…Na-fluorohectorite (Na-FHt) is a synthetic clay mineral with superior quality regarding structural homogeneity, narrow charge distribution, and especially large aspect ratio (≈20,000) compared to most other clay minerals (41)(42)(43). Na-FHt when immersed in water forms nematic suspensions where single nanosheets are separated to uniform distances defined by the amount of water added (39,(43)(44)(45)(46), as evidenced by small-angle x-ray scattering (SAXS), birefringence (BF), or other methods (36,37,39,45,(47)(48)(49)(50).…”

Section: Introductionmentioning

confidence: 99%

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Bright, noniridescent structural coloration from clay mineral nanosheet suspensions

et al. 2022

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Structural colors originate by constructive interference following reflection and scattering of light from nanostructures with periodicity comparable to visible light wavelengths. Bright and noniridescent structural colorations are highly desirable. Here, we demonstrate that bright noniridescence structural coloration can be easily and rapidly achieved from suspended two-dimensional nanosheets of a clay mineral. We show that brightness is enormously improved by using double clay nanosheets, thus optimizing the clay refractive index that otherwise hampers structural coloration from such systems. Intralayer distances, and thus the structural colors, can be precisely and reproducibly controlled by clay concentration and ionic strength independently, and noniridescence is readily and effortlessly obtained in this system. Embedding such clay-designed nanosheets in recyclable solid matrices could provide tunable vivid coloration and mechanical strength and stability at the same time, thus opening a previously unknown venue for sustainable structural coloration.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bright, noniridescent structural coloration from clay mineral nanosheet suspensions

et al. 2022

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“…Although the synthesis of Janus platelets by the modify-then-exfoliate method is more efficient, the yield of Janus platelets is limited, and less desired Gemini platelets will be generated 21 . Careful choice of inorganic template will avoid the formation of Gemini platelets 26 . The yield of final product, however, is still limited by the exfoliation and cleaving process.…”

Section: Introductionmentioning

confidence: 99%

Natural Halloysites-Based Janus Platelet Surfactants for the Formation of Pickering Emulsion and Enhanced Oil Recovery

Zhang

Lei

Luo

et al. 2019

Sci Rep

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Janus colloidal surfactants with opposing wettabilities are receiving attention for their practical application in industry. Combining the advantages of molecular surfactants and particle-stabilized Pickering emulsions, Janus colloidal surfactants generate remarkably stable emulsions. Here we report a straightforward and cost-efficient strategy to develop Janus nanoplate surfactants (JNPS) from an aluminosilicate nanoclay, halloysite, by stepwise surface modification, including an innovative selective surface modification step. Such colloidal surfactants are found to be able to stabilize Pickering emulsions of different oil/water systems. The microstructural characterization of solidified polystyrene emulsions indicates that the emulsion interface is evenly covered by JNPS. The phase behaviors of water/oil emulsion generated by these novel platelet surfactants were also investigated. Furthermore, we demonstrate the application of JNPS for enhanced oil recovery with a microfluidic flooding test, showing a dramatic increase of oil recovery ratio. This research provides important insights for the design and synthesis of two-dimensional Janus colloidal surfactants, which could be utilized in biomedical, food and mining industries, especially for circumstances where high salinity and high temperature are involved.

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“…The low fractional surface coverage is characteristic for the adsorption of PAMAM dendrimers in a highly charged state under low ionic strength conditions [40]. We could recently demonstrate that PAMAM dendrimers can be also used due to their unique shape and molecular weight distribution as probe for the surface chemistry of clay platelets [72].…”

Section: Visualizing Surface Charge By Adsorption Of Macroionsmentioning

confidence: 99%

Surface charge density and diffuse layer properties of highly defined 2:1 layered silicate platelets

et al. 2020

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Clays are not only ubiquitous in nature, but they are also used in huge quantities in a broad range of industrial applications, such as thixotropic drilling fluids, ore pelletizers, waste disposal sealants, or fillers in polymer nanocomposites. In order to model environmental processes or to design new materials on a rational base, it is of prime importance to determine and possibly modify the interfacial properties of clay platelets at the solid/electrolyte interface. In this context, the fundamental question rises how far the stoichiometric interlayer charges as determined by the composition of the silicate layer correlates with the diffuse doublelayer properties. Here, this question is addressed by means of a series of purposely synthesized sodium 2:1 layered silicates with defined composition and hence interlayer charge densities, respectively. Platelets of layered silicates of large enough diameter to perform AFM colloidal probe measurements were produced by melt synthesis. For comparison also, a natural muscovite mica has been included in this study. The diffuse layer properties in electrolyte solution have been determined by direct force measurements using the colloidal probe AFM technique and by electrokinetic measurements, respectively. We find that the diffuse layer potential decreases with increasing interlayer charge of the 2:1 layered silicates. This counterintuitive finding is attributed to ion adsorption and was further corroborated by determining the quantitative adsorption of polyelectrolytes, namely poly(amidoamine) dendrimers.

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Controlled Exfoliation of Layered Silicate Heterostructures into Bilayers and Their Conversion into Giant Janus Platelets

Cited by 12 publications

References 50 publications

Bright, noniridescent structural coloration from clay mineral nanosheet suspensions

Bright, noniridescent structural coloration from clay mineral nanosheet suspensions

Natural Halloysites-Based Janus Platelet Surfactants for the Formation of Pickering Emulsion and Enhanced Oil Recovery

Surface charge density and diffuse layer properties of highly defined 2:1 layered silicate platelets

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