Hydrophilicity-Dependent Distinct Frictional Behaviors of Different Modified MXene Nanosheets

Guan, Yanxue; Zhang, Miaomiao; Qin, Juan; Ma, Xingxing; Li, Chen; Tang, Jilin

doi:10.1021/acs.jpcc.0c01551

Cited by 40 publications

(31 citation statements)

References 46 publications

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“…Atomic and friction force microscopy studies using multilayer powder as well as single-to few-layer MXenes have demonstrated their overall ability to reduce friction at the nanoscale. [119,120] Ti 3 C 2 T x MXenes etched via different routes (HF, HCl-LiF, and TMAOH delamination) demonstrated notable differences regarding their pull-off and slide-off forces as well as contact angles and work of adhesion, which were connected to the changes in their surface terminations. [120] Very recently, Nb 2 CT x MXenes have shown lower frictional and adhesive forces compared to Ti 3 C 2 T x , which were connected to their different atomic compositions thus inducing differences in the surface dipole moment densities.…”

Section: Tribological Behavior Of Mxenesmentioning

confidence: 99%

“…[119,120] Ti 3 C 2 T x MXenes etched via different routes (HF, HCl-LiF, and TMAOH delamination) demonstrated notable differences regarding their pull-off and slide-off forces as well as contact angles and work of adhesion, which were connected to the changes in their surface terminations. [120] Very recently, Nb 2 CT x MXenes have shown lower frictional and adhesive forces compared to Ti 3 C 2 T x , which were connected to their different atomic compositions thus inducing differences in the surface dipole moment densities. [121] MXenes have been used as reinforcement phase in polymer composites to improve their mechanical and tribological properties.…”

Section: Tribological Behavior Of Mxenesmentioning

confidence: 99%

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2D MXenes: Tunable Mechanical and Tribological Properties

2021

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carbon/nitrogen (X) with bonded terminations (T x : -O 2 , -F 2 , -(OH) 2 , -Cl 2 , or their combinations) on the exterior transition metal surfaces. [6][7][8] MXenes' crystal structures and chemical formula are derived from their 3D crystalline precursors, which are usually MAX phases. [9] MAX phases are chemically denoted by M n+1 AX n (n = 1 to 4), for which the M-X layers found in MXenes are sandwiched by layers of A-group elements (mostly group 13-16 of the periodic table). [10] MXenes are synthesized by selectively removing/ etching these A-group element layers. Upon the removal of these A layers, surface terminations (T x ) occupy the bonding sites on M layers previously bonded to the A-group elements. [11] MXenes are excellent candidates for a range of applications (Figure 1a), including energy storage, [7] transparent electronics, [12,13] sensors, [14] electromagnetic interference (EMI) shielding, [15,16] and catalysis. [17] These applications involve MXenes as flexible and thin films, [13] MXenes as anchors in hybrid materials, [18] embedded in matrix materials, [19,20] or even as wearable fabrics. [21] In almost all these applications, fundamental understanding of the mechanical and tribological properties of MXenes is necessary (Figure 1b). The mechanical properties are vital to MXenes' applications in energy storage and catalysis, as MXenes in electrodes can act as active materials, conductive additives, strong binders, and current collectors, which can control the structure of the electrode and withstand expansion and contraction during charge and discharge cycles. [7,22] Additionally, the rise of flexible and wearable devices [13,21,23] necessitates mechanical characterization of MXene to withstand the required mechanical forces while maintaining the flexibility for these applications. Similarly, the potential applications of MXenes in triboelectric nanogenerators for energy storage and wearable electronics requires the characterization of MXenes' tribological properties. [24] More recently, MXenes have been used as reinforcement phases in composite materials. [25] The relevance of the mechanical and tribological properties in various applications is illustrated in Figure 1b. The rationale and support for this figure is summarized in Figures S1 and S2, Supporting Information, and discussed further in the Supporting Information.Despite well over 3000 publications to date on MXenes since their discovery, [26] only 4.9% of publications have studied their mechanical and tribological properties and their applications as reinforcement materials in composites, as shown in Figure 1a. Only two experimental studies on the mechanical stiffness 2D transition metal carbides, nitrides, and carbonitrides, known as MXenes, were discovered in 2011 and have grown to prominence in energy storage, catalysis, electromagnetic interference shielding, wireless communications, electronic, sensors, and environmental and biomedical applications. In addition to their high electrical conductivity and electrochemically activ...

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Section: Tribological Behavior Of Mxenesmentioning

confidence: 99%

Section: Tribological Behavior Of Mxenesmentioning

confidence: 99%

2D MXenes: Tunable Mechanical and Tribological Properties

2021

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“…In Figure 3 c,d MXene flakes are also present inside the polymer matrix. Due to the hydrophilic nature of the 2D Ti 3 C 2 T x MXene flakes [ 59 ] they effectively blend with the chitosan-hyaluronate matrix. Therefore, they disperse throughout the entire volume of the composite.…”

Section: Resultsmentioning

confidence: 99%

Controlling the Porosity and Biocidal Properties of the Chitosan-Hyaluronate Matrix Hydrogel Nanocomposites by the Addition of 2D Ti3C2Tx MXene

Rozmysłowska-Wojciechowska

Karwowska

Gloc

et al. 2020

Materials

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A recent discovery of the unique biological properties of two-dimensional transition metal carbides (MXenes) resulted in intensive research on their application in various biotechnological areas, including polymeric nanocomposite systems. However, the true potential of MXene as an additive to bioactive natural porous composite structures has yet to be fully explored. Here, we report that the addition of 2D Ti3C2Tx MXene by reducing the porosity of the chitosan-hyaluronate matrix nanocomposite structures, stabilized by vitamin C, maintains their desired antibacterial properties. This was confirmed by micro computed tomography (micro-CT) visualization which enables insight into the porous structure of nanocomposites. It was also found that given large porosity of the nanocomposite a small amount of MXene (1–5 wt.%) was effective against gram-negative Escherichia coli, gram-positive Staphylococcus aureus, and Bacillus sp. bacteria in a hydrogel system. Such an approach unequivocally advances the future design approaches of modern wound healing dressing materials with the addition of MXenes.

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“…[19][20][21] Novel fabrication methods could give rise to more abundant functional groups, such as À Cl and À Li, and the diversity of MXene crystal structures, which also provide the flexibilities of manipulating the properties of MXene by changing the composition and distribution of surface groups. [22,23] Electronic properties of MXene depend on the type of metal elements, X elements and surface functional groups. Researches on Ti 3 C 2 MXene are extensive, focusing on the following three major systems: 1) Covalent surface modification [24,25] and defects introduction, [26,27] such as by removing Ti atoms or decorating various chemical groups.…”

Section: Introductionmentioning

confidence: 99%

“…MXene shows an excellent ability in performance control through successfully inducing metal nanoparticles, surface defects or polymers [19–21] . Novel fabrication methods could give rise to more abundant functional groups, such as −Cl and −Li, and the diversity of MXene crystal structures, which also provide the flexibilities of manipulating the properties of MXene by changing the composition and distribution of surface groups [22,23] …”

Section: Introductionmentioning

confidence: 99%

Functional Group Modification and Bonding Characteristics of Ti₃C₂ MXene‐Organic Composites from First‐Principles Calculations

et al. 2021

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The unique physical structure and abundant surface functional groups of MXene make the grafted organic molecules exhibit specific electrical and optical properties. This work reports the results of first-principles calculations to investigate the composite systems formed by different organic molecular monomers, namely acrylic acid (AA), acrylamide (AM), 1-aziridineethanol (1-AD) and glucose, and Ti 3 C 2 MXene saturated with different functional groups, namely À OH, À O and À F. The results show that the interaction between organic molecules and the MXene surface depends on the type of functional groups of the organic molecules, while the strength of the interaction is determined by the type of surface functional groups and the number of hydrogen bonds. The bare Ti 3 C 2 and Ti 3 C 2 (OH) 2 can readily form strong chemical and hydrogen bonds with AA and AM molecules, leading to strong adsorption energy and a large amount of charge transfer, while the interaction between organic molecules and MXene saturated by À F or À O groups mainly exhibits physical interactions, accompanied by low adsorption energy and a small amount of charge transfer. This research provides theoretical guidance for the synthesis of high-performance MXene organic composite systems.

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Hydrophilicity-Dependent Distinct Frictional Behaviors of Different Modified MXene Nanosheets

Cited by 40 publications

References 46 publications

2D MXenes: Tunable Mechanical and Tribological Properties

2D MXenes: Tunable Mechanical and Tribological Properties

Controlling the Porosity and Biocidal Properties of the Chitosan-Hyaluronate Matrix Hydrogel Nanocomposites by the Addition of 2D Ti3C2Tx MXene

Functional Group Modification and Bonding Characteristics of Ti₃C₂ MXene‐Organic Composites from First‐Principles Calculations

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Hydrophilicity-Dependent Distinct Frictional Behaviors of Different Modified MXene Nanosheets

Cited by 40 publications

References 46 publications

2D MXenes: Tunable Mechanical and Tribological Properties

2D MXenes: Tunable Mechanical and Tribological Properties

Controlling the Porosity and Biocidal Properties of the Chitosan-Hyaluronate Matrix Hydrogel Nanocomposites by the Addition of 2D Ti3C2Tx MXene

Functional Group Modification and Bonding Characteristics of Ti3C2 MXene‐Organic Composites from First‐Principles Calculations

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Functional Group Modification and Bonding Characteristics of Ti₃C₂ MXene‐Organic Composites from First‐Principles Calculations