Spontaneous MXene monolayer assembly at the liquid–air interface

Петухов, Д. И.; Chumakov, Andrei; Kan, Akira; Лебедев, В. А.; Konovalov, Oleg; Eliseev, Andrei A.

doi:10.1039/c9nr00525k

Cited by 24 publications

(21 citation statements)

References 37 publications

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“…The self-assembly of Ti 3 C 2 T x MXene flakes at the air−water interface into a high-quality film was demonstrated by Petukhov et al 156 The behavior of the MXene flakes in their Langmuir monolayer depend on the pH condition of the subphase. The MXene flakes with negative charges form a thin layer with 1.5 nm thickness at pH > 4, but the thin layer includes coordinated anions to form a Br − /Ti 3 C 2 T x /subphase layer.…”

Section: ■ For Applicationsmentioning

confidence: 99%

Don’t Forget Langmuir–Blodgett Films 2020: Interfacial Nanoarchitectonics with Molecules, Materials, and Living Objects

2020

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Designing interfacial structures with nanoscale (or molecular) components is one of the important tasks in the nanoarchitectonics concept. In particular, the Langmuir−Blodgett (LB) method can become a promising and powerful strategy in interfacial nanoarchitectonics. From this viewpoint, the status of LB films in 2020 will be discussed in this feature article. After one section on the basics of interfacial nanoarchitectonics with the LB technique, various recent research examples of LB films are introduced according to classifications of (i) growing research, (ii) emerging research, and (iii) future research. In recent LB research, various materials other than traditional lipids and typical amphiphiles can be used as film components of the LB techniques. Two-dimensional materials, supramolecular structures such as metal organic frameworks, and biomaterials such as DNA origami pieces are capable of working as functional components in the LB assemblies. Possible working areas of the LB methods would cover emerging demands, including energy, environmental, and biomedical applications with a wide range of functional materials. In addition, forefront research such as molecular manipulation and cell fate control is conducted in LB-related interfacial science. The LB technique is a traditional and well-develop methodology for molecular films with a ca. 100 year history. However, there is plenty of room at the interfaces, as shown in LB research examples described in this feature article. It is hoped that the continuous development of the science and technology of the LB method make this technique an unforgettable methodology.

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Section: ■ For Applicationsmentioning

confidence: 99%

Don’t Forget Langmuir–Blodgett Films 2020: Interfacial Nanoarchitectonics with Molecules, Materials, and Living Objects

2020

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“…The Ti 3 C 2 T x hydrogel with locally oriented structure displayed a moderate steam generation rate of 1.34 kg m –2 h –1 under a light intensity of 1 kW m –2 (1 sun illumination), which is in line with the performance reported for the Ti 3 C 2 T x -based porous evaporator. − However, the Ti 3 C 2 T x hydrogel with a vertically aligned microchannels structure showed a much higher evaporation rate, and the highest value based on the projected area was observed in the hydrogel without a disordered “cap” region (1.90 kg m –2 h –1 ). The “cap” structure was formed during the freezing process, in which the accumulation of Ti 3 C 2 T x nanosheets at the liquid–air interface resulted in the formation of the densified structure that impedes the water transport (Figure S13). Herein we removed the cap structure in the Ti 3 C 2 T x frozen gel, and after thawing in protic acid, pristine Ti 3 C 2 T x hydrogels without a cap were prepared (Figure S14).…”

Section: Results and Discussionmentioning

confidence: 99%

Pristine Titanium Carbide MXene Hydrogel Matrix

Chen

Zhang

et al. 2020

ACS Nano

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The hydrogel matrix normally forms via covalent or noncovalent interactions that make the matrix resistant to hydration and disassembly. Herein this type of chemical transition is demonstrated in titanium carbide MXene (Ti 3 C 2 T x ), in which the exchange of intercalated Li + with hydrated protons triggers significantly suppressed hydration in stacked Ti 3 C 2 T x . Based on this intercalation chemistry behavior, pristine Ti 3 C 2 T x hydrogel matrices with an arbitrary microstructures are fabricated by freezing-induced preassembly and a subsequent specially designed thawing process in protic acids. The absence of extrinsic components maximizes the materials performance of the resultant pristine Ti 3 C 2 T x hydrogel, which produces a compressive modulus of 2.4 MPa and conductivity of 220.3 ± 16.8 S/m at 5 wt % solid content. The anisotropic Ti 3 C 2 T x hydrogel also delivers a promising performance in solar steam generation by facilitating rapid water transport inside vertical microchannels.

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“…At a liquid-vapor interface, Ti 3 C 2 T x MXene flakes spontaneously assemble into monolayer films. An XRR and GIXF investigation showed that both the structure of the layers and assembly kinetics depend on the pH of the solution [191]. Graphene oxide is another type of 2DM with increasing interest as a precursor for graphene based materials and as sensors, batteries, etc.…”

Section: Liquid Interfacesmentioning

confidence: 99%

Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research

Narayanan

Konovalov

2020

Materials

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This article aims to provide an overview of broad range of applications of synchrotron scattering methods in the investigation of nanoscale materials. These scattering techniques allow the elucidation of the structure and dynamics of nanomaterials from sub-nm to micron size scales and down to sub-millisecond time ranges both in bulk and at interfaces. A major advantage of scattering methods is that they provide the ensemble averaged information under in situ and operando conditions. As a result, they are complementary to various imaging techniques which reveal more local information. Scattering methods are particularly suitable for probing buried structures that are difficult to image. Although, many qualitative features can be directly extracted from scattering data, derivation of detailed structural and dynamical information requires quantitative modeling. The fourth-generation synchrotron sources open new possibilities for investigating these complex systems by exploiting the enhanced brightness and coherence properties of X-rays.

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Spontaneous MXene monolayer assembly at the liquid–air interface

Abstract: Here we report on the spontaneous assembly of Ti3C2Tx MXene flakes into monolayer films at the liquid–air interface.

Cited by 24 publications

References 37 publications

Don’t Forget Langmuir–Blodgett Films 2020: Interfacial Nanoarchitectonics with Molecules, Materials, and Living Objects

Don’t Forget Langmuir–Blodgett Films 2020: Interfacial Nanoarchitectonics with Molecules, Materials, and Living Objects

Pristine Titanium Carbide MXene Hydrogel Matrix

Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research

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