SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Saisai Li,Xin Geng,Chang Ma,Xia Zhan,Jiding Li,Mingguo Ma,Jing He,Luying Wang
Lignosulfonates are a by-product of the agricultural and forestry waste and paper industries. Strengthening the sustainable use of lignosulfonates is a problem to be solved. In this study, hydrophilic agricultural and forestry waste calcium lignosulfonate (CaLS) was combined with single/double-layered MXene , and added to the natural polysaccharide sodium alginate (SA) to prepare a pervaporation me, membrane with a three-component hybrid structure. Characterization experiments such as scanning electron microscopy and contact angle demonstrated that CaLS increased the hydrophilicity and reduced swelling of the membrane, and MXene formed a layered cross-sectional morphology that further reduced swelling. A 90% ethanol aqueous solution was used to evaluate the dehydration performance of the membrane. The results showed that the permeation flux and separation factor of the membrane increased by 74% and 160%, respectively. Compared to the pure SA membrane after CaLS was incorporated. MXene further improved the pervaporation performance of the MXene@CaLS/SA membrane, with the permeation flux of about 938 g·m −2 ·h −1 , and the separation factor of 4612 (two and four times higher than the pure SA membrane, respectively). This study provides a theoretical and technical basis for the development of new separation materials, and will help expand the high-value utilization of lignosulfonates.
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ACS Applied Nano Materials
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2021
·
IF 5.097
Fanrong Ai,Chaojun Fu,Guojun Cheng,Huanhuan Zhang,Yingchun Feng,Xiluan Yan,Xiangjuan Zheng
As an emerging zero-dimensional nanomaterial, MXene quantum dots (MQDs) have aroused the interest of researchers because of their unique physical and chemical characteristics. Here, a straightforward hydrothermal strategy was used to successfully produce the amino-functionalized Ti3C2 MQDs. The functionalized Ti3C2 MQDs exhibited bright blue fluorescence (FL), which was derived from its size effect and surface defects. In addition, Ni2+ can bind to the amino groups on the surface of Ti3C2 MQDs. The absorption of the excitation light by the light-absorbing substance causes nickel ions to effectively quench the photoluminescence of Ti3C2 MQDs, which can be explained by the internal filter effect (IFE). At the same time, the strong affinity of histidine (His) for Ni2+, which is absorbed by His to form a stable complex, causes Ni2+ to dissociate from the Ti3C2 MQD surface and restore the FL. Thus, a fluorescent sensor for detecting the His content in serum was developed. Overall, this work provides a method for the detection of His and shows that the Ti3C2 MQDs have great potential in biomedical and biosensing applications.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Lin Wang,Meiyun Zhang,Bin Yang,Jiaojun Tan
Developing one-dimensional fiber-based sensors to meet the requirement of spinnability, portability, flexibility, and easeful conformability in smart wearable devices has attracted increasing interest. Here, we report highly conductive MXene@aramid nanofibers (ANFs) with a distinct skin-core structure by the wet spinning method. MXene, an emerging 2D conductive material, is applied to build internal conductive paths. ANF frameworks function as protective and skeleton structures to reduce the fiber oxidation probability and achieve superior strength. The obtained MXene@ANF fiber with superior conductivity (2515 S m–1) and tensile strength (130 MPa) works as a promising sensor for smart fabrics to detect different human movements with abundant detection motions, fast response time (100 ms), and long service life (up to 1000 cycles). Benefiting from its high flexibility, it can be sewn into textile and gloves as a smart wearable device. Besides superior thermal stability, it shows promising electrothermal properties with wide heating temperature (25–123 °C) and fast heating temperature (10 s). Therefore, the MXene@ANF fiber with the skin-core structure shows great potential as a promising sensor to be applied in electric heating and smart wearable fabrics.
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CARBON
·
2021
·
IF 9.594
Chao Zhang,Huifeng Dong,Binling Chen,Tianxu Jin,Jun Nie,Guiping Ma
The development of bifunctional activity and long durability of ORR/OER catalyst is vital for realizing the practical application of Zn–air batteries (ZAB). Herein, 3D-structured bifunctional catalysts , CoFe nanoalloy decorated carbon nanotubes (CNT) anchoring with 2D MXene (Fe/Co-CNT@MXene-T), were prepared and fabricated as the cathode for both aqueous and flexible ZAB. Taking advantages of active sites of CoFe nanoparticles , robust sheath and fast charge transfer provided by CNT and MXene, our optimal catalyst Fe/Co-CNT@MXene-8 exhibited remarkable electroactivities of ORR and OER comparable with the benchmark Platinum carbon (Pt/C) and Ruthenium dioxide (RuO 2 ), respectively. The as-assembled aqueous ZAB with Fe/Co-CNT@MXene-8 as cathode exhibited a high specific capacity of 759 mA h g −1 at a current density of 10 mA cm −2 , and a stable voltage platform in the quick discharge–charge test under a 375h long-lasting operation, superior to those assembled with benchmark commercial catalyst and other reported catalysts. Furthermore, the as-assembled flexible ZAB with Fe/Co-CNT@MXene-8 as cathode also presented excellent durability cycling and showed promising perspectives as future power sources for wearable application. Such high performance was also verified by X-ray absorption near-edge structure (XANES) and supported by density functional theory (DFT) calculation. This work provides a novel view to design highly effective and long-lasting rechargeable ZABs.
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Materials Today Physics
·
2021
·
IF 9.298
Fengqi Qi,Lei Wang,Yali Zhang,Zhonglei Ma,Hua Qiu,Junwei Gu
Lightweight and robust electromagnetic interference (EMI) shielding materials are highly desirable in high-end precision electronic components and 5G communication system . Herein, the starch based porous carbon foam (PCF) is prepared by yeast fermentation, steam foaming and carbonization approach with flour as raw material. The Ti 3 C 2 T x MXene/PCF (MPCF) composites are then fabricated via vacuum assisted impregnation of Ti 3 C 2 T x MXene followed by freeze drying. The obtained PCF presents excellent compression strength and superior electrical properties. The compression strength and electrical conductivity ( σ ) of the PCF carbonized at 1400 °C are 4.9 MPa and 21.8 S/cm, respectively. The MPCF composites with 8.5 wt% Ti 3 C 2 T x MXene exhibits superior EMI shielding effectiveness (EMI SE) and specific shielding effectiveness (SSE, EMI SE/ ρ ) of 75 dB and 216.9 dB cm 3 /g, respectively. Meanwhile, the MPCF composites possess excellent flame retardancy and outstanding heat insulation performances, and can be applied in the extreme environments. The resultant lightweight, robust and multifunctional MPCF composites with simple fabrication processes show broad application prospects for EMI shielding systems in aerospace, military engineering, electrical and electronics fields.
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COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
San-E Zhu,Fen-Dou Wang,Jun-Jie Liu,Li-Li Wang,Cheng Wang,Anthony Chun Yin Yuen,Timothy Bo Yuan Chen,Imrana I. Kabir,Guan Heng Yeoh,Hong-Dian Lu,Wei Yang
Acrylonitrile-butadiene-styrene (ABS) resin is a commonly used engineering thermoplastic . Nevertheless, the fire toxicity hazards (HCN, NO x , NH 3 and CO) generated from the combustion of ABS remains a major concern, especially in building fire scenarios. To address this issue, boron dipyrromethene (BODIPY) modified MXene (Ti 3 C 2 T x ) nanosheets were prepared and utilized as a flame retardant for ABS. The loading of 0.5 wt% BODIPY-MXene resulted in the uniform dispersion in ABS. Accordingly, the tensile strength , Young's modulus and elongation at break of ABS/BODIPY-MXene0.5 were improved by 27.8%, 18.6% and 17.9% respectively compared to neat ABS, suggesting the enhanced mechanical properties . The limiting oxygen index (LOI) value was increased from 19.5% for neat ABS to 21.5% and 23.5% for ABS/BODIPY-MXene0.5 and ABS/BODIPY-MXene2.0 benefitted from the rapid carbonization . The cone calorimeter coupled with FTIR analysis showed that the reductions in peak heat release rate (−24.5%), peak smoke production rate (−18.4%), peak concentration of HCN (−33.5%), NO (−22.0%), N 2 O (−46.6%), NH 3 (−76.0%) and CO (−28.8%) were achieved by incorporating 0.5 wt% BODIPY-MXene to ABS in comparison with pure ABS. The improved fire safety properties were primarily attributed to the excellent barrier, free radical capture, and catalytic carbonization effect of BODIPY-MXene nanosheets within ABS matrix.
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Biomedical Optics Express
·
2021
·Vol. 12
·期 11
·7051-7063
·
IF 3.732
Wenjie Li,Yinping Miao,Tuan Guo,Kialiang Zhang,Jianquan Yao
An optofluidic system based on photothermal spectroscopy is proposed, which combines molecular photothermal effect with Nb2CTx MXene-tilted fiber Bragg grating (TFBG) for the detection of organophosphorus pesticides (OPs) with temperature compensated. Under the irradiation of excitation light, the photothermal effect of OPs produces a detectable change in the refractive index of the sample, and the concentration of chlorpyrifos can be quantified using TFBG. The Nb2CTx MXene coated TFBG allow more molecules to be absorbed on the surface of TFBG, which enhances the interaction between light and matter, and improves the sensitivity of detection. The temperature compensation is performed by referring to the core mode of TFBG, thereby eliminating the influence of ambient temperature on the photothermal detection. The experimental results show that the sensitivity reaches 1.8 pm/ppm with a limit of detection (LOD) of 0.35 ppm, and the obtained temperature compensation coefficient is 4.84 ppm/°C. This photothermal biosensor has the advantages of low LOD, temperature compensation and real-time online monitoring, making it a good candidate in medicine, chemistry and environmental monitoring.
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高影响因子
MICROCHIMICA ACTA
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2021
·Vol. 188
·期 11
·1-9
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IF 5.833
Xia Yixuan,Ma Yuzhi,Wu Yuntao,Yi Yinhui,Lin Huiyu,Zhu Gangbing
A proof-of-principle concept for free-electrodeposited anodic stripping voltammetry (ASV) sensing of Cu 2+ is proposed by using Ti 3 C 2 T x MXene/carbon black (Ti 3 C 2 T x @CB) nanohybrids as electrode materials. Owing to the high adsorption and reduction capability of Ti 3 C 2 T x towards Cu 2+ , Ti 3 C 2 T x MXene enables Cu 2+ to be immobilized and self-reduced directly to form Cu 0 on the Ti 3 C 2 T x @CB electrode surface. As a result an oxidation peak current appears from the re-oxidation of Cu 0 via differential pulse voltammetry. Carbon black (CB) was introduced to prevent Ti 3 C 2 T x Mxene aggregation and improve the related electron transfer as well as enhance their surface area. After optimizing various conditions, a considerable low limit of detection (4.6 nM) and a wide linear range (0.01–15.0 μM) for Cu 2+ were achieved at the working potential from − 0.3 V to 0.0 V (vs SCE). Relative standard deviation (RSD) of eight individual Ti 3 C 2 T x @CB electrodes is 3.72%, and the recoveries from tap water sample and lake water sample were in the ranges of 97.0–108% and 104–107%, respectively. Graphical abstract
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yulin Zhang,KaiXuan Chen,Yueshan Li,Ji Lan,Bin Yan,Lingying Shi,Rong Ran
As a new two-dimensional material similar to graphene, MXene has attracted extensive attention in the field of electrochemical materials such as supercapacitors because of its excellent mechanical properties, electrical conductivity, and thermal conductivity. What is better than graphene is that the few-layer MXene material obtained by proper treatment has good water dispersibility and can be used as an ideal nanomaterial to enhance the conductivity of hydrogels. However, the articles about the few-layer MXene material used in the preparation of composite hydrogels are rare. In this paper, MXene was synthesized by Yury mild method. Poly(N-isopropyl acrylamide) (PNIPAM) hydrogel and physical cross-linking hydrogel were used as the matrix to prepare composite hydrogels with temperature sensitivity and stress-sensing properties. The composite hydrogels exhibited excellent mechanical properties: it could be stretched to over 14 times the original length and achieved a 0.4 MPa tensile strength while showing good self-healing ability, which was of great significance for the practical application of hydrogels. The conductivity of the composite hydrogel was 1.092 S/m, which was about 15 times that of the control hydrogel without MXene. The potential of the composite hydrogel as a smart compression sensor was also verified by the conductivity tests.
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Soft Matter
·
2019
·Vol. 16
·期 1
·162-169
·
IF 3.399
Peng Zhang,Xiu-Jie Yang,Peng Li,Yingyuan Zhao,Qingshan Jason Niu
A highly stretchable nanocomposite (NC) hydrogel was fabricated via in situ free radical polymerization of acrylamide. In particular, an exfoliated two-dimensional MXene (Ti3C2) nanosheet was utilized as a crosslinker instead of traditional organic crosslinkers. The exfoliated Ti3C2 nanosheets were confirmed by atomic force microscopy (AFM) and dynamic light scattering (DLS) measurements. Compared with traditional organic crosslinked N,N-methylene bisacrylamide (BIS)/polyacrylamide (PAM) hydrogels (fracture strength of 32.0 kPa and elongation of 109.6%), the synthesized Ti3C2/PAM NC hydrogels exhibited greatly improved mechanical properties with fracture strengths of 66.5 to 102.7 kPa, compressive strengths of 400.6 to 819.4 kPa and elongations at break of 2158.6% to 3047.5% as the Ti3C2 content increases from 0.0145% to 0.0436%. The enhanced mechanical performances can be attributed to the honeycomb-like fine structure with uniform pores as well as more flexible polymer chains in NC hydrogel networks. When loaded with drugs, Ti3C2/PAM NC hydrogels exhibited good sustained-release performance, higher drug loading amounts (97.5–127.7 mg g−1) and higher percentage releases (62.1–81.4%), greatly superior to those of the BIS/PAM hydrogel (46.4 mg g−1, 45.0%). Our work reveals the application of MXene materials in the fabrication of NC hydrogels with enhanced mechanical and drug release behaviors.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 46
·1905694
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IF 15.621
Lin Yang,Chunxiang Dall'Agnese,Yohan Dall'Agnese,Gang Chen,Yu Gao,Yoshitaka Sanehira,Ajay Kumar Jena,Xiao-Feng Wang,Yury Gogotsi,Tsutomu Miyasaka
MXenes are a large and rapidly expanding family of 2D materials that, owing to their unique optoelectronic properties and tunable surface termination, find a wide range of applications including energy storage and energy conversion. In this work, Ti 3 C 2 T x MXene nanosheets are applied as a novel type of electron transport layer (ETL) in low-temperature processed planar-structured perovskite solar cells (PSCs). Interestingly, simple UV-ozone treatment of the metallic Ti 3 C 2 T x that increases the surface Ti O bonds without any change in its bulk properties such as high electron mobility improves its suitability as an ETL. Improved electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency (PCE) from 5.00% in the case of Ti 3 C 2 T x without UV-ozone treatment to the champion PCE of 17.17%, achieved using the Ti 3 C 2 T x film after 30 min of UV-ozone treatment. As the first report on the use of pure MXene layer as an ETL in PSCs, this work shows the great potential of MXenes to be used in PSCs and displays their promise for applications in photovoltaic technology in general.
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ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Bing Zhou,Zhen Zhang,Yanli Li,Gaojie Han,Yuezhan Feng,Bo Wang,Dianbo Zhang,Jianmin Ma,Chuntai Liu
Flexible, lightweight, robust, and multifunctional characteristics are greatly desirable for next-generation wearable electromagnetic interference (EMI) shielding materials. In this work, an alternating multilayered structure with robust polymer frame layers and directly contacted conducting layers was designed to prepare high-performance EMI films. Especially, the multilayered films containing alternating cellulose nanofiber (CNF) layers and MXene layers are fabricated via a facile and efficient alternating vacuum filtration approach. Deriving from the mechanical frame effect acted by CNF layers in, which is capable of preventing the nanosized “zigzag” crack in MXene layers from growing to the whole film, the alternating multilayered film (CNF@MXene) revealed the improved mechanical strength (112.5 MPa) and toughness (2.7 MJ m–3) compared to both freestanding MXene film and homogeneous CNF/MXene film. Meanwhile, the directly contacted MXene layers resulted in the increased electrical conductivity from 2 (homogeneous CNF/MXene film) to 621–82 S m–1 (CNF@MXene films). In conjunction with the extra “reflection-absorption-zigzag reflection” mechanism among the alternating multilayers, CNF@MXene films demonstrated an exceptional EMI shielding effectiveness of ∼40 dB in the X-band and K-band and high specific shielding effectiveness up to 7029 dB cm2 g–1 at a thickness of only 0.035 mm. Besides, the excellent mechanical flexibility ensured the stable EMI shielding and electrical properties, which can withstand the folding test more than 1000 times without obvious reduction. Moreover, the excellent electrical conductivity endows the alternating multilayered film with an outstanding and steady Joule heating performance, which could reach more than 100 °C at only 6 V impressed voltage to within 10 s. As a result, our alternating multilayered film with reinforced EMI shielding and Joule heating performance is promising in the next-generation intelligent protection devices applying in cold and complex practical environments.
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