ADVANCED FUNCTIONAL MATERIALS
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2024
·Vol. 34
·期 30
·2315813
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IF 18.5
Ying Liu,Guoxing Tian,Yingjie Du,Pengju Shi,Na Li,Yunfeng Li,Zhihui Qin,Tifeng Jiao,Ximin He
As wearable sensors advance rapidly, demands for multifunctional conductive soft materials are ever higher, including high stretchability, resilience, adhesiveness and stability, simultaneously in one material, for stable long-term use. Nanocomposite hydrogels incorporating conductive two-dimensional (2D) nanofillers, such as MXene-composited gels, emerge as promising candidates. Yet, fulfilling all above requirements, particularly large stretchability with low hysteresis, remains a challenge, owing to the easy oxidation and weak interactions of MXene nanosheets with polymer chains. Herein, an interfacial engineering strategy is proposed, where tannic acid (TA) with high-density hydroxyl groups is introduced to encapsulate MXene into a stable TA@MXene nano-motif and meanwhile increase the hydrogen-bonding interactions between TA@MXene and polymer network. By incorporating TA@MXene into poly(hydroxyethyl acrylate) (PHEA) network in a glycerol/water binary solvent, the obtained organohydrogel exhibits integrated properties of high stretchability (>500%) with low hysteresis (<3%), superior fatigue resistance (consistent hysteresis over 500 cycles at 300% strain), good adhesiveness, along with long-term stability (>7 days) and antifreezing abilities (−40 °C). Such organohydrogels demonstrate superior strain-sensitivity and thermosensitive capacities, enabling accurate and reliable detection of human movements, electrocardiogram signals, and body temperature. This general approach of stabilizing nanomaterials while effectively enhancing nanomaterial-polymer bonding is applicable for synthesizing diverse high-performance nanocomposited gels.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Qingping Xin,Sining Kong,Xueting Cao,Yucheng Pan,Kun Wan,Hao Chen,Huimin Jin,Ningning Gao,Xiaoli Ding,Yuzhong Zhang
At the present time, the realm of gas separation membranes is predominantly centered on the development of membrane materials that simultaneously exhibit exceptional gas permeability and selectivity. Mixed Matrix Membranes (MMMs) hold significant promise in addressing the long-standing challenge of balancing membrane selectivity with permeability. By incorporating a molecular sieving mechanism, an enhanced gas separation process is achieved. In this research endeavor, single-layer MXene nanosheets serve as an ideal substrate for the direct growth of ZIF-8 nanoparticles, yielding heterogeneously structured nanofillers, coined ZIF-8@MXene. The composite filler, ZIF-8@MXene, maintains a two-dimensional lamellar structure reminiscent of MXene, while also integrating ZIF-8 nanoparticles with their optimal pore size of 3.4 Å. This optimal pore size efficiently facilitates the unimpeded passage of CO 2 molecules through the channels, creating a preferential pathway. Conversely, N 2 molecules encounter greater difficulty traversing these channels, effectively coupling the solubility-diffusion mechanism with the molecular sieving mechanism to enhance selectivity in gas separation processes. Consequently, the mixed matrix membrane exhibits a remarkable enhancement in gas selectivity. Particularly, under sub-ambient conditions (−20 °C), the PEO/ [email protected] % membrane achieves an exceptional CO 2 /N 2 selectivity of 294.1, accompanied by a high CO 2 permeability of 115.58 Barrer. This outstanding performance surpasses the 2019 upper bound, underscoring the significant potential of heterostructured nanofillers to be harnessed in advancing various mixed matrix membranes (MMMs) towards high-performance gas separation capabilities.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ran Chang,Jing Ma,Yanyun Hou,Jianzhong Xu
Graphene oxide (GO)-based membranes have exhibited fascinating superiority in water treatment. However, water transfer resistance caused by the tortuous interlayer pathway and swelling in aqueous solutions of GO membranes are still bottlenecks in wastewater treatment. Here, a heterostructured GO membrane was designed by intercalating amino-terminated MXene (MXene-NH2) in GO layers. Specifically, the inserted MXene-NH2 with a small size in the gap of GO layers can increase the vertical distance between GO layers and offer a shortened water transport pathway for enhanced permeability. Meanwhile, the interaction between the amino groups of MXene-NH2 and the carboxyl groups of GO can restrict the deformation of the layered structure, thus inducing improved stability. Accordingly, the obtained GO/MXene-NH2 composite membrane exhibited a flux of about 11.31 L/(m2 h bar) at low pressure (1 bar), which was 4 times higher than that of the GO membrane (̃2.73 L/(m2 h bar)). Meanwhile, high rejections of the membrane for different charged dyes (≥96%) remained. Besides, the GO/MXene-NH2 membrane showed excellent antiswelling properties. This strategy provides a method for the design of a heterostructure membrane and promotes the practical application of the GO membrane.
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POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Ying Zhou,Weidi He,Jiling Song,Dinghong Xu,Hongmin Wu,Jianbing Guo
The fabrication of ultralight high-performance flame-retardant composites significantly reduces fire risk for buildings. Flame retardation of porous polyvinyl alcohol (PVA) aerogels with directional arrangement is difficult. Herein, the polyvinyl alcohol/ 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivative/two-dimensional (2D) MXene (PVA/DiDOPO/MXene) composite aerogel was prepared by ice template one-way freezing process. PVA-DiDOPO4 composite aerogel with an oriented porous structure reaches the V-1 level at the UL-94 test. Moreover, the peak heat release rate (pHRR) value of PVA-DiDOPO4 reduces to 452.26 (W/g) from 482.88 (W/g) of pure PVA. In addition, PVA/DiDOPO/MXene composite aerogel has improved thermal decomposition properties such as the maximum decomposition temperature (T max1 ) of the PVA-DiDOPO4 sample attains 319.92 °C from pure PVA of 302.90 °C. The design strategy of PVA combined 2D MXene nanosheet and DOPO derivatives construct oriented porous composite aerogel paves the way for the fabrication and customization of ultralight flame-retardant polymer composites, which can be expected to be applied in construction and reduce fire risk.
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Small
·
2025
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IF 12.1
Jinhe Wei,Fei Hu,Chenglong Lv,Limin Bian,Xinyu Quan,Qiuyun Ouyang
The design and synthesis of multifunctional nanomaterials have attracted considerable attention for expanding the range of practical applications. Herein, a metal–organic framework (MOFs)-derived NiCo 2 S 4 attached to MXene is rationally designed and constructed for an optical limiter and supercapacitor. The MOF-derived NiCo 2 S 4 enhances the tendency of hydroxyl groups on the MXene surface to attract metal ions, resulting in the formation of sulfur vacancies. Moreover, MXene offers a high specific surface area to facilitate the rapid complexation of charge carriers. The resultant MXene@NiCo 2 S 4 (MX@NCS) exhibits markedly enhanced nonlinear optical (NLO) and electrochemical properties through synergistic interactions between the components. The NLO properties can be further optimized by adjusting the amount of MX@NCS powder dispersed in methyl methacrylate (MX@NCS) 2–6 /PMMA) by using the Z-scan technique. Specifically, the (MX@NCS) 4 /PMMA exhibits the strongest reverse saturable absorption (RSA) and self-defocusing effects at 100 µJ with β = 3.87 × 10 2 cm·GW −1 and γ = −5.94 × 10 −4 cm 2 ·GW −1 . Concurrently, the constructed supercapacitor shows a superior energy density of 51.21 Wh·kg −1 at a power density of 863.65 W·kg −1 . Notably, the present study indicates a novel strategy to explore the application of materials in the development of efficient optical limiter and supercapacitor technologies.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Liya Lin,Xin Jing,Gangrong Wang,Jian Yang,Yaoxun Zhang,Jiazhou Zeng,Chongzhao Zhang,Xianggui Liu
MXene has been widely used in hydrogels due to its high electrical conductivity and surface tunability. However, its self-stacking behavior hinders its further utilization. To address that, we proposed a nanoengineering strategy that used sulfonated polyurethane nanoparticles (PU) to modify MXene, aiming to improve its dispersibility in the hydrogel precursor solution via the hydrogen bonding interactions between the sulfonic acid groups of PU and the oxygen-containing groups of MXene, which not only avoid the self-stacking of MXene but also endow the prepared hydrogel with ultrathinness of 32 μm, great stretchability of 1834%, high toughness of 385.6 KJ/m3 as well as great puncture resistance, whose puncture displacement reached 85 mm at a thickness of 300 μm. Moreover, the hydrogel was also assembled as a strain sensor to monitor the human motions in real-time and recognize different hand gestures for human-machine interfaces. Furthermore, the hydrogel was capable of working as electrodes to assemble the trioelectric nanogenerators to power small devices for continuous energy supply. Overall, the developed ultrathin hydrogel fabricated via the nanoengineered MXene exhibited great potential in wearable electronics for flexible sensing, human-computer interaction, and self-powered devices.
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ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Lan-Ying Liu,Min-Hua Cui,John Justo Ambuchi,Shi-Ming Niu,Xin-Hui Li,Wo-Long Wang,He Liu,Guo-Shuai Liu,Ai-Jie Wang
Electrocatalytic hydrodechlorination (EHDC) is a promising approach to safely remove halogenated emerging contaminants (HECs) pollutants. However, sluggish production dynamics of adsorbed atomic H (H* ads ) limit the applicability of this green process. In this study, bimetallic Pd–Cu@MXene catalysts were synthesized to achieve highly efficient removal of HECs. The alloy electrode (Pd–Cu@MX/CC) exhibited better EHDC performance in comparison to Pd@MX/CC electrode, resulting in diclofenac degradation efficiency of 93.3 ± 0.1%. The characterization analysis revealed that the Pd 0 /Pd II ratio decreased by forming bimetallic Pd–Cu alloy. Density functional theory calculations further demonstrated the electronic configuration modulation of the Pd–Cu@MXene catalysts, optimizing binging energies for H* and thereby facilitating H* ads production and tuning the reduction capability of H* ads . Noteably, the amounts and reduction potential of H* ads for Pd–Cu@MXene catalysts were 1.5 times higher and 0.37 eV lower than those observed for the mono Pd electrode. Hence, the introduction of Cu into the Pd catalyst optimized the dynamics of H* ads production, thereby conferring significant advantages to EHDC reactions. This augmentation was underscored by the successful application of the alloy catalysts supported by MXene in EHDC experiments involving other HECs, which represented a new paradigm for EHDC for efficient recalcitrant pollutant removal by H* ads .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Ziyan Chen,Wentao Cao,Yating Liu,Haibo Liu,Jing Ru,Mengting Yin,Xiong Luo,Yiming Zhang,Feng Chen
The high mortality and enormous economic burden of bacterially infected wounds remains a huge challenge for human health. The development of ideal wound dressings with desirable antibacterial and good wound healing properties still remains a major problem affecting the regeneration of bacterially infected wound tissue. Herein, we present novel alginate-based hydrogel microspheres containing lysozyme and MXene (i-Lyso@Alg), in which the positively charged lysozyme is immobilized on the negatively charged MXene by electrostatic interaction. Due to the presence of MXene, i-Lyso@Alg exhibits good thermal effect, drug release behavior and strong antibacterial activity under near-infrared (NIR) irradiation. The synthesized i-Lyso@Alg can realize not only improvement of lysozyme stability but also photothermal responsive up-regulation for biocatalysis of lysozyme. The excellent antibacterial activities of i-Lyso@Alg were attributed to the photothermally enhanced lysozyme activity, assisted by bacterial death caused by local thermal effect of photothermally activated MXene and the physical damage due to the MXene. In addition, in the infected skin wounds of rats, i-Lyso@Alg + NIR significantly accelerates the wound healing process by inhibiting the expression of inflammatory factors and bacterial ( Staphylococcus aureus ) infection, and inducing the expression of pro-angiogenic factors and tissue remodeling. Overall, the results of this study introduce a pioneering approach by integrating the unique photothermal properties of MXene with the enzymatic action of lysozyme within an alginate-based hydrogel microsphere. This synergistic system not only advances the frontier of antibacterial wound dressings but also represents a significant step towards effective management of infected wounds, which possesses great potential in clinical treatment of infected wounds.
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ACS Applied Nano Materials
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2024
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IF 5.3
Lingzhi Huang,Shiyun Chen,Li Ding,Haihui Wang
Two-dimensional (2D) nanofluidic channels have shown great potential for efficient ion separation due to the synergy of the charge microenvironment and confined 2D planar channels. However, current 2D channels mainly rely on postdecoration with ion-specific recognition molecules, while the regulation of the membrane structure and the role of the channel itself have been overlooked. Herein, we constructed two types of membranes to demonstrate the critical role of building units in 2D lamellar membranes. By tuning the lateral size of MXene nanosheets, we prepared a large-lateral-sized MXene membrane (LMM)(∼5.47 μm) and a small-lateral-sized MXene membrane (SMM)(∼524 nm) to systematically study the ion transport behavior. The results showed that the LMM exhibited preferential transport of monovalent ions (Li+, Na+, and K+) while impeding permeation of multivalent ions (Ca2+, Mg2+, and Al3+), contributing to the selectivity of Li+/Mg2+ ≈ 12. In contrast, the SMM allowed for the fast transport of all monovalent/divalent ions, leading to poor selectivity (e.g., Li+/Mg2+ ≈ 2.3), which could be attributed to the abundant nonselective defects in the SMM. Density functional theory calculations reveal that the weakest interaction between MXene and Li+ determines the selective transport of Li+ over other ions. This work highlights the importance of building defect-free 2D membranes for ion sieving using nondecorated 2D nanofluidic channels.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Ao Zhou,Wenwen Cai,Weijian Guo,Jizhen Ma,Yueqing Wang,Jintao Zhang
Designing highly effective, low-cost bifunctional electrocatalysts without noble metals for overall water splitting remains a significant challenge. In this work, interfacial coupling of Ce-doped CoSe 2 nanoneedle arrays with MXene (Ce-CoSe 2 /MXene) is developed via the facile hydrothermal and selenization methods. The extensive specific surface area and favorable hydrophilicity of Ti 3 AlC 2 , combined with the optimized electronic structure and abundant active sites from Ce-doping and selenization, contribute to the exceptional bifunctional electrocatalytic performance of the Ce-CoSe 2 /MXene electrode. Specifically, this heterostructure achieves a low hydrogen evolution reaction (HER) overpotential of 34 mV at 10 mA cm −2 , an oxygen evolution reaction (OER) overpotential of 279 mV at 100 mA cm −2 , and an overall water splitting (OWS) potential as low as 1.45 V at 10 mA cm −2 . In-situ Raman spectroscopy reveals that surface reconstruction would improve catalytic activity and stability. Theoretical calculations indicate that the Ce-CoSe 2 /MXene can improve the adsorption of intermediates and facilitate HER/OER process by lowering the kinetic barrier, thereby enhancing electrocatalytic activity. This research marks a substantial advancement in the development of low-cost, efficient electrocatalysts for overall water splitting.
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Inorganic Chemistry Frontiers
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2025
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IF 6.4
Sheng Wan,Hanbo Wang,Yan Wang,Rui Wang,Dongyu Pei,Ziming Wang,Yumei Tian,Shi Zhan,kechang li,Haiyan Lu
Nickel-cobalt double hydroxide is gaining significant interest due to its high theoretical specific capacitance. However, its tendency to agglomerate and low electrical conductivity present major challenges for its application. This study employed a one-step hydrothermal method to integrate exfoliated few-layer MXene materials with NiCo-LDH, facilitating the uniform vertical growth of NiCo-LDH nanosheets on the surface of the MXene, effectively minimizing agglomeration. Additionally, the interfacial synergy between MXene and NiCo-LDH enhances the transfer of electrons from NiCo-LDH to MXene, resulting in an electron-rich MXene and an oxygen vacancy-rich NiCo-LDH. Together, these characteristics significantly improve the electrochemical performance of the material at high current densities, achieving 7776 Wh kg−1 and 66.96 Wh k g−1 at 15 A g−1. After cycling 40,000 times, it retains an impressive capacity retention rate of 89.5%. These findings demonstrate that MXene materials effectively tackle the main challenges associated with NiCo-LDH, opening new possibilities for their application in electrode materials.
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ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Feifei Xu,Danyi Shang,Congcong Zhu,Guangzhu Du,Jingchen Shi,Xuefang Dong,Xiuling Li,Xinmiao Liang
Phosphopeptide enrichment methods based on commercial TiO2 suffer from difficulties in regulating intermolecular interactions, resulting in low coverage rate and the loss of information on multiphosphorylation sites, thereby limiting comprehensive phosphoproteomic analysis. In this work, MXene Ti3C2Tx was incorporated into the design of enrichment materials, with its surface structure functionalized and regulated to address the low elution efficiency of TiO2 for multiphosphorylated peptides. Upon oxidation treatment, the Ti3C2Tx material formed numerous uniformly distributed TiO2 nanoparticles on the surface of Ti3C2Tx-O, providing abundant affinity sites (Ti–O) for selective phosphopeptide enrichment. The polycrystalline structure and rich oxygen vacancies of the material effectively regulated its binding affinity with phosphate groups, achieving simultaneous high-efficiency enrichment of both monophosphorylated and multiphosphorylated peptides. Its performance was significantly superior to that of commercial TiO2 and IMAC materials. This study presents great promise for the practical application of comprehensive phosphoproteomic analysis in the future and broadens the application of MXene in the biological field.
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