Applied Materials Today
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2024
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IF 7.2
Hongtao Zhu,Han Lu,Junhuang Xu,Xuejun Lai,Hongqiang Li,Xingrong Zeng,Xiangrong Wu,Hong Liu
With the rapid development of flexible electronics, the functional elastomer with excellent mechanical properties as substrate for the preparation of high-performance piezoresistive pressure sensor has become one of the frontier research hotspots. Here, a tough and self-healing linear polydimethylsiloxane (PDMS) elastomer with multiple hydrogen-bonding interactions was synthesized, and then utilized as substrate to prepare piezoresistive pressure sensor with 2-ureido-4[1H]-pyrimidinone modified carbon nanotubes (UPy-CNTs) as conductive material and salt particles as sacrificial template to construct electrical pathways and ridge-like microstructure, respectively. The obtained elastomer showed high transmittance of above 90 % and excellent mechanical properties with tensile strength of 4.23 MPa, elongation at break of 984 % and toughness of 24.83 MJ m -3 . With the exchange and reconstruction of multiple hydrogen bonds, the elastomer achieved high healing efficiency of 99.1 % after healing at 80 °C for 24 h. In addition, the elastomer-based piezoresistive pressure sensor exhibited high sensitivity of 2.04 kPa -1 , wide sensing range of 0–450 kPa, short response/recovery time of 80/100 ms and excellent sensing repeatability (8000 loading-unloading cycles). The sensor was successfully applied for detecting various human motions, including finger and knee bending, exhalation, swallowing and heart-pulse, and realized remote transmission of pressure signals with a wireless monitoring circuit. Furthermore, the sensor could restore its sensing function even after being cut into two halves, showing great potential in the fields of wearable device, health monitoring and electronic skin.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
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IF 14.7
Zhao Yang,Yang Feng,Jiang Han,Gao Guandao
Piezoceramic membranes have emerged as a prominent solution for membrane fouling control. However, the prevalent use of toxic lead and limitations of vibration-based anti-fouling mechanism impede their wider adoption in water treatment. This study introduces a Mn/BaTiO 3 piezoceramic membrane, demonstrating a promising in-situ anti-fouling efficacy and mechanism insights. When applied to an Alternating Current at a resonant frequency of 20 V, 265 kHz, the membrane achieves optimal vibration, effectively mitigating various foulants such as high-concentration oil (2500 ppm, including real industrial oil wastewater), bacteria and different charged inorganic colloidal particles, showing advantages over other reported piezoceramic membranes. Importantly, our findings suggest that the built-in ultrasonic vibration of piezoceramic membranes can generate reactive oxygen species. This offers profound insights into the distinct anti-fouling processes for organic and inorganic wastewater, supplementing and unifying the traditional singular vibrational anti-fouling mechanism of piezoceramic membranes, and potentially propelling the development of piezoelectric catalytic membranes.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yunjie Hao,Xiaoyu Guo,Jiao Li,Hongqiang Wang,Fang Liu,Lilan Huang,Haibin Sun,Xue Guo
In terms of treating the problem of oily wastewater, membrane separation technology has always been a simple and efficient method of oil–water emulsion separation. Inspired by the hydrophilic bumps of the desert beetle, the polyetherimide (PEI) fiber membrane with super-hydrophilic/underwater super-oleophobic properties was prepared by electrospinning and subsequent seeded aggregation strategy of resorcinol (R) and formaldehyde (F). The membrane (PEI@RF) demonstrates pearl necklace-like structures and good antifouling properties, oil–water separation performances, as well as good stabilities in a variety of environments (immersed in water at high/low temperature, and in acid/alkali/salt solutions). More importantly, the as-prepared membrane exhibits excellent performance for various kinds of oil–water mixtures separation, and the corresponding separation fluxes and efficiencies are above 2600 L/m 2 ·h and 99 %, respectively.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Shanlei Chang,Kai Rong,Yuchen Wang,Zhixuan Yu,Junfeng Zhai,Hongwei Tian,Youxing Fang,Shaojun Dong
Specific applications of gels can raise multiple demands, including low cost, elasticity, adaptability to wide temperature ranges, conductivity, and reduced hazards, thereby presenting diverse challenges for one material. Deep eutectic solvents (DESs) offer unexpected solutions to tackling the challenging task. Here, we mixed anhydrous diallyldimethylammonium chloride (DMDAAC) and urea to synthesize a polymerizable DES with a wide range of solubility. It can polymerize to form versatile DES gel upon photoinitiation. The gel exhibited high transparency (∼94 %), a wide range of temperature tolerance (−40 ∼ 100 °C), outstanding elastic properties (ε > 2400 %), good conductivity (0.05 mS·cm −1 ) and self-healing capability. The pristine gel film was successfully applied to motion sensors, while the DES gel with lignin was also employed as an elastic anti-UV film. Moreover, its water-solubility and non-hazardous compositions suggest the minimize environmental impact of the DES gel. This polymerizable DES can not only boost the development of electronic devices like motion sensors, but also inspire more creative ideas in promising applications of DESs and DES gels.
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JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Zhuoqun Li,Guangshun Dong,Jian Pan,Xinyu Chen,Xinyu Lou,Lilan Huang,Kai Guo
With the continuous development of environmental protection and resource recycling demands, the development of bio-based separation membrane materials has increasingly attracted attention. Bio-based polyamide 56 (PA56), exhibiting excellent hydrophilicity, spinnability, and mechanical properties, is expected to complement and replace traditional separation membrane materials. In this study, the electrospinning preparation and structural control of PA56 nanofiber membranes were achieved through the optimization of PA56 content and mixed solvent ratios. The study found that when the PA56 content was 16 wt% and the formic acid to acetone ratio in the mixed solvent was 8:2, the nanofiber diameter distribution was the most uniform. Building on this, amino-functionalized modified silica (SiO 2 –NH 2 ) nanoparticles were introduced to prepare PA56/SiO 2 –NH 2 composite nanofiber membranes featuring a cobweb-like nanofiber network and micro-nodule structure. The effects of the addition of SiO 2 –NH 2 nanoparticles on the morphology, structure, and properties of the fiber membranes were studied. The results indicate that the control of the mixed solvent ratio and the addition of SiO 2 –NH 2 nanoparticles led to the formation of a cobweb-like nanofiber network and micro-nano nodular structure on the nanofiber surface, enhancing the hydrophilicity of PA56 nanofiber membranes. The M − 3 membrane with a nanoparticle addition amount of 0.8 wt% exhibited high hydrophilicity and underwater superoleophobic properties, achieving efficient separation of stable oil-in-water emulsions with a separation efficiency of 99.8 %. This work provides a new bio-based membrane material and its preparation method for treating oily wastewater using the membrane separation method.
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FIBERS AND POLYMERS
·
2024
·
IF 2.2
Zhou Xinnan,Xin Binjie,Gao Di,Newton Md. All Amin
In the purification of oily wastewater, polyvinylidene fluoride (PVDF) nanofiber membranes have attracted widespread attention for their excellent water–oil separation performance. And chitosan (CS), as a natural polymeric alkaline polysaccharide containing many functional groups interacting with heavy metal ions, such as –NH 2 and –OH, has been widely used to treat heavy metal ions in wastewater. However, a few studies have been conducted on superhydrophilic and underwater hydrophobic PVDF composite membranes for the simultaneous removal of heavy metal ions and oil from wastewater. In this paper, PVDF/PVP composite membranes were used as the substrate of separation membranes, and PVDF/PVP-modified membranes were prepared by surface coating with PDA and CS in turn. Among them, CS can be coated on the surface of PVDF/PVP composite membrane by cross-linking the amino group on the molecule with the quinone structure in the PDA molecule to form a stable CS/PDA gel layer. Compared with other modified membranes, CS/PDA-PVDF/PVP has better hydrophilicity and underwater oleophobicity. The underwater OCA of dichloromethane could reach 161°, and the OCA of other oils were above 140°. The water flux was 14,171 L m −2 h −1 . After 15 mixture and emulsion separation tests, the separation efficiency was higher than 99% and 98%, respectively. The adsorption efficiency for Cu 2+ , Pb 2+ , and Cr 3+ aqueous solutions with concentrations of 10–60 mg/L reached more than 80%. Therefore, this method has great potential in treating oily wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Pei Nian,Xiaojuan Wang,Xiaoling Zuo,Shuming Li,Siyuan Qiao,Yibin Wei
Switchable surface wettability has attracted tremendous attention owing to its potential applications, but it is still thorny to construct under-liquid dual superlyophobic surfaces for reversible separation of emulsified oil/water mixtures and treatment of complex oily wastewater. In this work, a CoAl-LDH-based mesh membrane was prepared for switchable separation of emulsified oily wastewater. The interpenetrating CoAl-LDH nanosheets were grown on the stainless steel mesh (SSM) forming a micro-/nano hierarchical structure via a hydrothermal method, which endows the membrane with under-liquid dual superlyophobicity. The obtained CoAl-LDH membrane exhibited switchable separation capability for both oil/water mixtures and oil/water emulsions with high fluxes and efficiencies (99.7%). In addition, the CoAl-LDH membrane could not only separate but also photodegrade the oil-in-water (O/W) emulsions containing soluble organic pollutants. Interestingly, after introducing a ZnO nanorod layer, the LDH/ZnO membrane exhibited progressive removal efficiency (99%) and photodegradation efficiency (＞99%) for methylene blue (MB). The cycled and harsh condition tests also confirmed the stability and robustness of the prepared membranes. The excellent separation performance and photocatalytic property endow the membranes appealing to practical oil/water separation and oily wastewater treatment.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Zhuqing Wang,Yiyang Li,Yupu Meng,Zhiwei Huang,Min Wang
This research employed a simplistic approach to modify polydimethylsiloxane (PDMS) and graphene oxide (GO) onto the surface of the PU skeleton, and then synthesize an oil–water separation material (rGO@PDMS/PU) with photothermal conversion performance and superoleophilic/superhydrophobic properties through high-temperature reduction. The synthesized rGO@PDMS/PU can adsorb organic solvents or oil that are 19–37 times its own weight, while also having a 99.1% oil–water separation efficiency. Additionally, rGO@PDMS/PU also has good photothermal conversion ability. Under the intensity of 1 sunlight ( q = 1 kW m −2 ), its surface temperature can reach 95.4°C within 10 s. Relying on the excellent oil–water selectivity and photothermal conversion capabilities of rGO@PDMS/PU, we also build a novel oil-gathering device that can successfully make oil recovery on the water surface in situ. When the device is under light conditions, its crude oil recovery efficiency is nearly four times higher than when there is no light. Therefore, this new oil-gathering device has broad application prospects in high-viscosity oil leakage incidents such as crude oil and engine oil.
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FIBERS AND POLYMERS
·
2025
·
IF 2.3
Guo Xiaoyu,Feng Changjian,Huang Lilan,Wang Hongqiang,Liu Fang,Li Jiao
Polylactic acid (PLA) membranes offer advantages such as biodegradability, non-toxicity, and biocompatibility for oil–water separation. However, it remains challenging to fabricate PLA membranes with sufficient mechanical strength and hydrophobicity for practical applications. In this study, a superhydrophobic fibrous membrane based on PLA and Polybutylene terephthalate adipate (PBAT) is prepared via electrospinning, followed by a high-humidity treatment. The effects of PBAT content and high humidity treatment on the morphology, hydrophobicity, and mechanical properties of PBAT/PLA composite fiber membranes are investigated. The results show that the introduction of PBAT effectively enhances the fiber diameter, crystallization, hydrophobicity, and mechanical properties of PBAT/PLA fibers. Moreover, the high humidity treatment further improves the mechanical and hydrophobic properties of the membranes. When 0.2 g of PBAT is added and the high humidity treatment lasts for 24 h, the resulting PBAT/PLA fibrous membrane exhibits an outstanding water contact angle (WCA) of 158.23°, tensile strength of 3.802 MPa, excellent oil–water separation flux (6500 L/(m 2 ·h)), and efficiency of 99.80%, demonstrating great potential for oil–water separation applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yuxin Zhu,Ting Zhang,Hong Liu,Chenkai Jin,Chengqi Feng,Juncheng Huang,Haining Na,Jin Zhu
The preparation of stable and efficient cellulose-based oil/water separation membranes is of great significance in solving the problem of industrial oily wastewater. Herein, rod-like hydroxyapatite (HAP) modified microfibrillated celluloses (MFCs) are used to form the fibrous framework to produce a microporous PDMS-MFC-HAP membrane. The membrane shows good superhydrophobicity with a water contact angle of 151.6°. It exhibits the oil-water separation performance for various water-in-oil emulsions. The separation flux of the membrane is up to 3665.3 L·m −2 ·h −1 ·bar −1 under 0.5 bar pressure with a separation efficiency of over 99.6 %. The PDMS-MFC-HAP membrane could maintain a high separation efficiency of 98.6 % after 20 cycles. This study provides a simple and effective method to fabricate cellulose-based superhydrophobic membranes, which have a greater potential to achieve oil-water separation for oily wastewater treatment with high efficiency.
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FOOD AND CHEMICAL TOXICOLOGY
·
2025
·
IF 3.5
Jun Wang,Qiuyue Liao,Gai Liang,Yuruo Gong,Jiaxu Yao,Li Zhou,Wei Kevin Zhang,Xiaojun Li
Ethosomes are ethanol-based liposomes which may self-assemble in alcoholic beverages and exhibit dual effects: nanoscale ethanol has liver-targeting property with potential hepatotoxicity on the one side, while ethosomes can encapsulate active constituents that provide hepatoprotective benefits on the other side. This study investigated the dual role of ethosomes, focusing on their existence, characterization, potential toxicity, and toxicological mechanisms. Our results confirmed the existence of ethosomes in alcoholic beverages using particle size analysis, ultracentrifugation, liquid chromatography-mass spectrometry, and transmission electron microscopy. Both in vitro and in vivo experiments revealed that ethosomes can cause significant liver injury in a short period, associated with abnormal secretion of transforming growth factor-β ( TGF-β ) by parenchymal cells and subsequent apoptosis of Kupffer cells. Notably, the toxicity of ethosomes was significantly reduced when encapsulated natural active compounds like oleanolic acid. In conclusion, ethosomes could form self-assembly in the production progress of the integrated alcoholic beverages. The present study underscored the dual impact of ethosomes on alcoholic liver disease and offered new insights into the safety risk assessment of alcoholic beverages.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yan Zhang,Jianlin Yang,Yali Zhao,Zhecun Wang
Surfaces exhibiting under-liquid dual superlyophobicity (combined underwater superoleophobicity and underoil superhydrophobicity) hold immense potential for intelligent oil/water separation systems, yet their realization remains thermodynamically constrained. Herein, we proposed an interfacial hydrophilic/hydrophobic chain regulation strategy that synergistically constructed an under-liquid dual superlyophobicity coating via integrating dynamic interfacial chain reorganization with multiscale structural. By programmatically regulating hydrophobic chain lengths in amphiphilic molecules, precise control over the adaptive conformational switching of self-assembled monolayers on hierarchically nanostructured substrates was achieved to tune membrane macroscopic wettability. The coating exhibits reversible wettability transitions between underoil superhydrophobic and underwater superoleophobicity, which is consistent with the dynamic molecular reconfiguration of environment-responsive molecular chains. Consequently, the coated-porous membrane, with under-liquid dual superlyophobicity, exhibits over 99 % separation efficiency for light/heavy oil/water mixtures and emulsions, especially in long-term on-demand separation of emulsions. This practical and simple strategy provides a versatile platform for developing smart materials for on-demand treatment of complex oily wastewater.
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