SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Jinwei Xue,Lei Zhu,Xu Zhu,Hui Li,Chao Ma,Shifan Yu,Daofeng Sun,Fujun Xia,Qingzhong Xue
In recent years, oil spills and industrial organic pollutants have caused irreparable damage to the environment and biological ecosystems. Therefore, the treatment of oily wastewater has become a serious global challenge. Here, we prepared superhydrophobic and superoleophilic tetradecylamine-MXene functionalized melamine sponge for effective oil/water separation and selective oil adsorption using a facile and effective method. It is found that the functionalized sponge can selectively and effectively absorb various oils from oil/water mixtures, which absorption capacity ranges from 60 to 112 times its own mass. Moreover, the water-in-oil emulsion can be efficiently separated by the functionalized sponge, due to its high oil selectivity. Besides, the functionalized sponge shows great mechanical property, chemical stability, and repeatability in various harsh environments, which make it great promising in the treatment of oily wastewater.
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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Kunpeng Qian,Hongmin Wu,Jianhui Fang,Yuhuan Yang,Miao Miao,Shaomei Cao,Liyi Shi,Xin Feng
Ti 3 C 2 T x MXenes with excellent metallic conductivity have proved promising in its application of electromagnetic interference (EMI) shielding. A hierarchical hybrid film with ultrathin thickness composed of Ti 3 C 2 T x MXene layers embedded with yarn-ball-shaped microspheres of cellulose nanofibrils (CNF) and multiwalled carbon nanotube (MWCNT) was designed to improve the absorption of electromagnetic waves (EMWs). The addition of yarn-ball-shaped microspheres is to shield more EMWs via multiple reflections in the inner space and reduce the undesirable emissions into the air. After thermal annealing treatment, the ultrathin film with intercalation of the carbonized yarn-ball-shaped CNF/MWCNT microspheres exhibited enhanced EMWs absorption as an important part of shielding effectiveness (45.1±0.9 dB) as well as excellent mechanical stability (≈0.9 million bending times). Thus, the well-designed structure of multilayered hybrid films with intercalated conductive microspheres can be a good candidate for higher absorption in EMI shielding effectiveness and outstanding mechanical properties.
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ENERGY CONVERSION AND MANAGEMENT
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2020
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IF 8.208
Xueling Li,Huawei Chang,Lijian Zeng,Xianrong Huang,Yichao Li,Renfu Li,Zhaojun Xi
A newly direct absorption solar collector (DASC) based on MXene nanofluid is proposed herein. The excellent optical properties of MXene nanofluids are experimentally determined, and a three-dimensional steady-state numerical model is developed to investigate the synergistic effect of the optical properties of MXene nanofluids and the structural parameters of the DASC. The effects of volume flow rate, working temperature, and solar concentration ratio on the photothermal conversion performance of the DASC are also analyzed. The results show that the transmittance of the MXene nanofluid evidently decreases because of the enhanced absorption of solar radiation of MXene. With the addition of MXene, the photothermal conversion efficiency of the nanofluid rapidly increases and then slightly decreases. The optimal MXene mass fraction is inversely proportional to the collector height. A mere 100 ppm of MXene nanofluid can achieve a maximum intercept efficiency of 77.49%, which is 55.47% higher than that of the base fluid. This work demonstrates the potential for the application of MXene nanofluids in the utilization of solar energy.
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ACS Omega
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2020
·
IF 2.87
Yusi Peng,Ping Cai,Lili Yang,Yingying Liu,Linfeng Zhu,Qiuqi Zhang,Jianjun Liu,Zhengren Huang,Yong Yang
Recent advances in MXenes with high carrier mobility show great application prospects in the surface-enhanced Raman scattering (SERS) field. However, challenges remain regarding the improvement of the SERS sensitivity. Herein, an effective strategy considering charge-transfer resonance for semiconductor-based substrates is presented to optimize the SERS sensitivity with the guidance of the density functional theory calculation. The theoretical calculation predicted that the excellent SERS enhancement for methylene blue (MeB) on Ti3C2 MXene can be excited by both 633 and 785 nm lasers, and the Raman enhanced effect is mainly originated from the charge-transfer resonance enhancement. In this work, the Ti3C2 MXenes exhibit an excellent SERS sensitivity with an enhancement factor of 2.9 × 106 and a low detection limit of 10–7 M for MeB molecules. Furthermore, the SERS enhancement of Ti3C2 and Au–Ti3C2 substrates exhibit higher selectivity on different molecules, which contributes to the detection of target molecules in complex solution environments. This work can provide some theoretical and experimental basis for the research on SERS activity of other MXene materials.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yunxiu Liu,Yu Tian,Qiuyang Han,Jie Yin,Junchuan Zhang,Yue Yu,Weizhong Yang,Yi Deng
Because of the explosive generation of drug-fast bacteria, antibiotics-free strategy is much-needed for elimination of bacterial-associated contagion. Herein, we develop a near-infrared (NIR) activated heterostructure catalyst (MXene/CoNWs) consisted of two-dimensional (2D) MXene and one-dimensional (1D) cobalt nanowires (CoNWs) in acting against bacteria for drug-free therapy. The intercalated CoNWs can rapidly trap the photogenerated electrons from Ti 3 C 2 MXene nanosheets, thus restrains the recombination of hot electron-hole and facilitates transfer of carriers upon 808 nm NIR illumination, thereby increasing the yields of germicidal reactive oxygen species (ROS). Additionally, the photothermal effect of the 2D/1D heterostructure is significantly strengthened due to the synergy of plasmonic CoNWs and MXene semiconductor. The heterostructure coatings on an orthopedic implant can achieve a high antibacterial efficacy of over 90% against Gram-positive/Gram-negative bacteria within 20 min, resulting from the synergistic actions of NIR-triggered ROS and hyperthermia. Besides, in vitro findings indicate that MXene/CoNWs heterojunctions show acceptable cytocompatibility. Accordingly, the two merits make the novel MXene/CoNWs heterojunctions become a promising drug-free antibacterial therapy for cleaning the pathogenic infection and avoiding antibiotic resistance in practice.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Jundong Shao,Jing Zhang,Chao Jiang,Jing Lin,Peng Huang
As a prominent member of two dimensional (2D) materials, MXenes have shown encouraging photophysical properties and so there is highly desirability to explore their phototherapeutic potential in cancer. Herein, we demonstrate a facile top-down strategy for the synthesis of nitride-based MXene, titanium nitride quantum dots (Ti 2 N QDs) in solution. With a size of around 5 nm, the obtained Ti 2 N QDs exhibit extraordinarily high photothermal conversion efficiency under laser irradiation in both first and second near-infrared (NIR) biowindows (NIR-I, 808 nm, 48.62%; and NIR-II, 1064 nm, 45.51%). In vitro and in vivo assessments demonstrate that the Ti 2 N QDs possess excellent biocompatibility, photoacoustic (PA) effect, and photothermal therapy (PTT) efficiency. Moreover, the Ti 2 N QDs showing obvious aggregation in tumors after 4 h post-injection, which enables facilitate PA imaging-guided PTT in both NIR-I/II biowindows without noticeable toxicity. Encouragingly, the Ti 2 N QDs with appropriate degradation property also show an applicable excretion rate from the body in vivo , which ensures sufficient stability in circulation to accomplish therapeutics roles and then can be smoothly discharged from the body after that. These results indicate the high potential of biodegradable Ti 2 N QDs in PA imaging-guided PTT in both NIR-I/II biowindows for precision cancer treatment.
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ACS Nano
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2020
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IF 14.588
Jie Cao,Zehang Zhou,Quancheng Song,Keyu Chen,Gehong Su,Tao Zhou,Zhuo Zheng,Canhui Lu,Xinxing Zhang
Soft actuation materials are highly desirable in flexible electronics, soft robotics, etc. However, traditional bilayered actuators usually suffer from poor mechanical properties as well as deteriorated performance reliability. Here, inspired by the delicate architecture of natural bamboo, we present a hierarchical gradient structured soft actuator via mesoscale assembly of micro–nano-scaled two-dimentional MXenes and one-dimentional cellulose nanofibers with molecular-scaled strong hydrogen bonding. The resultant actuator integrates high tensile strength (237.1 MPa), high Young’s modulus (8.5 GPa), superior toughness (10.9 MJ/m3), and direct and fast hygroscopic actuation within a single body, which is difficult to achieve by traditional bilayered actuators. The proof-of-concept prototype robot is demonstrated to emphasize its high mechanical robustness even after bending 100 000 times, kneading, or being trampled by an adult (7 500 000 times heavier than a crawling robot). This bioinspired mesoscale assembly strategy provides an approach for soft materials to the application of next-generation robust robotics.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Lei Wei,Jing-Wen Wang,Xin-Hua Gao,Hou-Qing Wang,Xin-Zhu Wang,Hua Ren
Excellent comprehensive dielectric properties (including dielectric constant and loss) are essential for electromechanical transducers. This work introduced a bimodal network composite with poly(dimethyl siloxane) (PDMS) and delaminated Ti3C2Tx sheets (d-Ti3C2Tx) modified with hyperbranched polysiloxane (HPSi) (referred to as HPSi-d-Ti3C2Tx). Before the final cross-linking, HPSi-d-Ti3C2Tx, trapped with short-chain PDMS (CS-PDMS) and long-chain PDMS (CL-PDMS), was pre-reacted, which formed a distinct bimodal network structure. d-Ti3C2Tx/PDMS and HPSi-d-Ti3C2Tx/PDMS composites with different filler loadings were prepared, and their percolation thresholds (fc) were 1.32 and 1.43 vol %, respectively The dielectric constant of 1.40 vol % HPSi-d-Ti3C2Tx/PDMS is 23.7 at 102 Hz, which is 1.5 times that of 1.28 vol % d-Ti3C2Tx/PDMS and 8.5 times that of pure PDMS. Meanwhile, the dielectric loss of HPSi-d-Ti3C2Tx/PDMS composite is still relatively small (0.11 at 103 Hz). The origin of dielectric property optimization of the composite is attributed to the boundary capacitor model, the accumulated charges at the interfaces between the conductive filler and the insulating polymer matrix of the composite, and the distinct bimodal network structure.
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ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Shijie Wang,Dongdong Jin,Ye Bian,Rutao Wang,Li Zhang
Conversion-type magnetite shrewdly shows abundance, nontoxicity, and high lithium storage capacity. However, either pristine magnetite or nanocomposites with two-dimensional materials cannot prevent restacking, pulverization, and poor structural homogeneity simultaneously because of a lack of universal interfacial interactions. Here, an electrostatic self-assembly strategy is uncovered between hollow Fe3O4/C microspheres (with H+-induced quasi-intrinsic positive charge) and few-layer MXenes (with intrinsic negative charge from terminating functionalities). This strategy realizes the uniform and interconnected architecture of Fe3O4/C@MXene that favors fast Li+ diffusion, easy electron/charge transfer, and suppressed pulverization. Specifically, after the long-term cycling, an undegraded specific capacity of 907 mA h g–1 remains at 0.5 A g–1. Further adoption of such superior anode in 4.0 V lithium-ion capacitors results in a high energy density of 130 W h kg–1, a maximum power density of 25,000 W kg–1, and excellent cycling stability. This work thus sheds light on a generic self-assembly process where intrinsic electrostatic interaction plays an essential role.
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Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 5
·1205-1211
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IF 5.958
Miao Zhang,Xifan Chen,Jinyi Sui,Bahreselam Sielu Abraha,Yang Li,Wenchao Peng,GuoLiang Zhang,Fengbao Zhang,Xiaobin Fan
MXenes are a family of two-dimensional (2D) transition metal carbides, nitrides and carbonitrides that are supposed to be promising materials for high pseudocapacitive energy storage. It has been proven that Ti3C2Tx (Tx refers to –F, O, –Cl and –OH) MXenes with more O-termination could exhibit better performance in pseudocapacitors. However, direct oxidation modification would result in the serious oxidation of Ti3C2Tx into titanium dioxide. Here we report the controllable oxidation of Ti3C2Tx by readily adjusting the loading of ammonium persulfate, in order to turn the –F terminal groups to –O terminal groups on the Ti3C2Tx MXene. The partially oxidized Ti3C2Tx achieved a high capacitance of 303 F g−1 at 2 mV s−1, and 96.6% capacity can remain even after 9000 cycles. Hence, the controllable oxidation modification of Ti3C2Tx could be a promising strategy for surface modification of MXenes.
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Advanced Materials Technologies
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2020
·Vol. 5
·期 7
·2000248
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IF 5.969
Lianjia Zhao,Yiqiang Zheng,Kang Wang,Chao Lv,Wei Wei,Lili Wang,Wei Han
Although ammonia gas sensor research has been developed for a long time, room temperature flexible ammonia gas sensors with high sensitivity and selectivity are still hot research topics. 2D transition metal carbides and nitrides (MXenes) have combined their versatile surface chemistry and high metal conductivity to show their enormous sensing potential. Herein, developing a room temperature nanocomposite based on 2D MXenes materials and cationic polyacrylamide (CPAM) with high gas response and flexibility targeting the construction of high-performance ammonia sensors is focused on. Thanks to the hydrogen bond composition, ohmic contact with the interdigitated electrodes, and excellent mechanical properties, the CPAM/Ti 3 C 2 T x -based ammonia sensors exhibit high ammonia selectivity, faster response–recovery rate (12.7/14.6 s), excellent flexibility, and long-term mechanical stability at room temperature. The synthesis of the CPAM/Ti 3 C 2 T x nanocomposites offers a lasting inspiration for developing high-performance flexible gas sensors.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 9
·3120-3126
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IF 7.059
Miao Miao,Ruiting Liu,Sineenat Thaiboonrod,Liyi Shi,Shaomei Cao,Jianfeng Zhang,Jianhui Fang,Xin Feng
Ultrathin, lightweight and flexible electromagnetic interference (EMI) shielding films are urgently desired for the next generation electronic devices with complex-shaped surfaces. In this study, flexible EMI shielding composite films were fabricated by intercalating sliver nanowires (AgNWs) into Ti3C2Tx MXene nanosheets followed by a pressured-extrusion film-forming process. The resultant MXene/AgNW composite films with a low loading of nanocellulose (0.167 wt%) as a green binder exhibited remarkable conductivity (∼30 000 S m−1) and outstanding specific EMI shielding effectiveness (SSE/t, 16 724 dB). Thanks to the strengthening mechanism of the “brick-and-mortar” layered structure, the tensile stress of the MXene/AgNW composite film dramatically improved from 1.29 MPa (pure Ti3C2Tx film) to 63.80 MPa, and the electric conductivity and EMI SE can be maintained even after bending at 135° 10 000 times. The MXene/AgNW hybrid films with excellent EMI SE and mechanical robustness offered promising applications in the fields of aerospace, defense, smart electronics and flexible/wearable devices.
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