Study on contact angles and surface energy of MXene films

Zhou, Hang; Wang, Fuqiang; Wang, Yuwei; Li, Changping; Shi, Changrui; Liu, Yu; Ling, Zheng

doi:10.1039/d0ra09125a

Cited by 41 publications

(30 citation statements)

References 57 publications

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“…DI water, ethylene glycol, and glycerol were used as the testing liquids. According to the Young equation and the Lewis acid/base theory, [33][34][35] the surface energy of dehydro-uorinated PVDF with different reaction times was calculated and shown in Table 2 (the detailed calculation method is shown in ESI †). As can be seen from Table 2, the surface energy of PVDF increased from 22.4 mJ m À2 to 38.6 mJ m À2 as the reaction time increased from 0 h to 12 h.…”

Section: Physical Propertiesmentioning

confidence: 99%

Effect of dehydrofluorination reaction on structure and properties of PVDF electrospun fibers

Wang

Liu

et al. 2021

RSC Adv.

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Section: Physical Propertiesmentioning

confidence: 99%

Effect of dehydrofluorination reaction on structure and properties of PVDF electrospun fibers

Wang

Liu

et al. 2021

RSC Adv.

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“…The high degree of hydration of HF-MXene also effectively stabilizes the surface defects and functional groups through hydrogen bonding. Synthesized under aqueous acidic environments, Ti 3 C 2 T x MXene has well-known hydrophilicity. ,− The replacement of −F surface groups by −OH and −O leads to spontaneous water intercalation due to their higher hydrophilicity . Furthermore, upon heating, the Ti 3 C 2 T x MXenes with more −F groups release water at lower temperatures than those with less −F .…”

Section: Resultsmentioning

confidence: 99%

Energetic Stability and Interfacial Complexity of Ti₃C₂T_x MXenes Synthesized with HF/HCl and CoF₂/HCl as Etching Agents

Goncharov

Hammond-Pereira

Reece

et al. 2022

ACS Appl. Mater. Interfaces

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MXenes are ultra-thin two-dimensional layered early transition-metal carbides and nitrides with potential applications in various emerging technologies, such as energy storage, water purification, and catalysis. MXenes are synthesized from the parent MAX phases with different etching agents [hydrofluoric acid (HF) or fluoride salts with a strong acid] by selectively removing a more weakly bound crystalline layer of Al or Ga replaced by surface groups (−O, −F, −OH, etc.). Ti3C2T x MXene synthesized by CoF2/HCl etching has layered heterogeneity due to intercalated Al3+ and Co2+ that act as pillars for interlayer spacings. This study investigates the impacts of etching environments on the compositional, interfacial, structural, and thermodynamic properties of Ti3C2T x MXenes. Specifically, compared with HF/HCl etching, CoF2/HCl treatment leads to a Ti3C2T x MXene with a broader distribution of interlayer distances, increased number of intercalated cations, and decreased degree of hydration. Moreover, we determine the enthalpies of formation at 25 °C (ΔH f,25°C) of Ti3C2T x MXenes etched with CoF2/HCl, ΔH f,25°C = −1891.7 ± 35.7 kJ/mol Ti3C2, and etched with HF/HCl, ΔH f,25°C = −1978.2 ± 35.7 kJ/mol Ti3C2, using high-temperature oxidation drop calorimetry. These energetic data are discussed and compared with experimentally derived and computationally predicted values to elucidate the effects of intercalants and surface groups of MXenes. We find that MXenes with intercalated metal cations have a less exothermic ΔH f,25°C from an increase in the interlayer space and dimension heterogeneity and a decrease in the degree of hydration leading to reduced layer–layer van der Waals interactions and weakened hydration effects applied on the MXene layers. The outcomes of this study further our understanding of MXene’s energetic–structural–interfacial property relationships.

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“…To calculate it, the Fowkes’ method was applied by equation (Equation (5)), where

are the total,

are the dispersive and

are the polar components of the liquid surface energy. Water (

= 21.8 mJ/m 2 and

= 51 mJ/m 2 ) and diiodomethane (

= 50.8 mJ/m 2 and

= 0 mJ/m 2 ) were used as the test liquids [ 23 ]. Briefly, at least 4 drops of 10 µL were placed on the surface of the films.…”

Section: Methodsmentioning

confidence: 99%

Lactide and Ethylene Brassylate-Based Thermoplastic Elastomers and Their Nanocomposites with Carbon Nanotubes: Synthesis, Mechanical Properties and Interaction with Astrocytes

Bello-Álvarez

Etxeberria

Polo³

et al. 2022

Polymers

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Polylactide (PLA) is among the most commonly used polymers for biomedical applications thanks to its biodegradability and cytocompatibility. However, its inherent stiffness and brittleness are clearly inappropriate for the regeneration of soft tissues (e.g., neural tissue), which demands biomaterials with soft and elastomeric behavior capable of resembling the mechanical properties of the native tissue. In this work, both L- and D,L-lactide were copolymerized with ethylene brassylate, a macrolactone that represents a promising alternative to previously studied comonomers (e.g., caprolactone) due to its natural origin. The resulting copolymers showed an elastomeric behavior characterized by relatively low Young’s modulus, high elongation at break and high strain recovery capacity. The thermoplastic nature of the resulting copolymers allows the incorporation of nanofillers (i.e., carbon nanotubes) that further enable the modulation of their mechanical properties. Additionally, nanostructured scaffolds were easily fabricated through a thermo-pressing process with the aid of a commercially available silicon stamp, providing geometrical cues for the adhesion and elongation of cells representative of the nervous system (i.e., astrocytes). Accordingly, the lactide and ethylene brassylate-based copolymers synthesized herein represent an interesting formulation for the development of polymeric scaffolds intended to be used in the regeneration of soft tissues, thanks to their adjustable mechanical properties, thermoplastic nature and observed cytocompatibility.

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Study on contact angles and surface energy of MXene films

Abstract: This work sheds light on the process- and time-dependent wetting behaviors and surface energy of MXene films.

Cited by 41 publications

References 57 publications

Effect of dehydrofluorination reaction on structure and properties of PVDF electrospun fibers

Effect of dehydrofluorination reaction on structure and properties of PVDF electrospun fibers

Energetic Stability and Interfacial Complexity of Ti₃C₂T_x MXenes Synthesized with HF/HCl and CoF₂/HCl as Etching Agents

Lactide and Ethylene Brassylate-Based Thermoplastic Elastomers and Their Nanocomposites with Carbon Nanotubes: Synthesis, Mechanical Properties and Interaction with Astrocytes

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Study on contact angles and surface energy of MXene films

Abstract: This work sheds light on the process- and time-dependent wetting behaviors and surface energy of MXene films.

Cited by 41 publications

References 57 publications

Effect of dehydrofluorination reaction on structure and properties of PVDF electrospun fibers

Effect of dehydrofluorination reaction on structure and properties of PVDF electrospun fibers

Energetic Stability and Interfacial Complexity of Ti3C2Tx MXenes Synthesized with HF/HCl and CoF2/HCl as Etching Agents

Lactide and Ethylene Brassylate-Based Thermoplastic Elastomers and Their Nanocomposites with Carbon Nanotubes: Synthesis, Mechanical Properties and Interaction with Astrocytes

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Product

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Energetic Stability and Interfacial Complexity of Ti₃C₂T_x MXenes Synthesized with HF/HCl and CoF₂/HCl as Etching Agents