JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Ming-Yu Lv,Shen-Hui Li,Heng Mao,Ying-Nan Feng,Ao-Shuai Zhang,Li-Hao Xu,Sen Wang,Wen-Wen Xie,Zhi-Ping Zhao
Polymeric membrane separations have been used for hydrocarbon recovery in some polyolefin plants due to the low energy consumption and easy operation, but the relatively low separation factor and hydrocarbon permeance block their ways to popularization. In this study, membranes with high propylene permeance and sufficient separation factor for propylene/nitrogen separation were prepared by direct incorporating 2-methylimidazole (MIM) into polydimethylsiloxane (PDMS), which manifested simultaneous promotion of separation factor and propylene permeance. Interestingly, MIM simultaneously acted in promoting the crosslinking process of PDMS and tetraethyl orthosilicate . A series of tests and characterizations were conducted to investigate the microstructure, morphology, thermal property, and mass transfer property of the membranes. The gas separation performance of the MIM-incorporated PDMS membrane with a separation factor of 20.2 and propylene permeance of 440.9 GPU outperformed many other propylene-selective membranes reported in the literature. Molecular dynamics simulations revealed that MIM had a preferential affinity for propylene rather than nitrogen, which was similar to PDMS, but the propylene-affinity of MIM was significantly higher than that of PDMS, accounting for the promoted separation of propylene/nitrogen upon the incorporation of MIM. The MIM-incorporated PDMS membranes with readily available, cheap materials and straightforward manufacturing procedures should be a promising alternative for hydrocarbon recovery. It is also enlightening for the study and design of membrane materials for gas separation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiujuan Zhang,Xinlu Zhang,Bangyao Du,Xiaokun Wang,Xuehua Ruan,Wenji Zheng,Yan Dai,Minggang Guo,Gaohong He
While extracorporeal oxygenation (ECMO) is regarded as the golden weapon for patients with cardiopulmonary failure in critical care, its clinical use is usually complicated by the blood coagulation on the hydrophobic surface of the artificial membrane for gas exchange. Herein, amphiphilic polydimethylsiloxane‐hydroxyethyl methacrylate (PDMS-HEMA) material was firstly synthesized from chemical reaction between HEMA and the vinyl group on the side chains of PDMS via a simple process, and then coated on the microporous polyethersulfone (PES) base membrane to obtain PDMS-HEMA/PES composite membrane . Structure characterizations demonstrated that HEMA and PDMS were successfully copolymerized, and PDMS-HEMA/PES composite membranes were well prepared with a flat dense PDMS-HEMA layer coated on the surface of microporous PES substrate. Surface property analyses confirmed much smoother membrane surface, phase-separated morphology, and significant decrement in water contact angles for PDMS-HEMA obtained. More importantly, the PDMS-HEMA/PES composite membrane exhibited a CO 2 /O 2 gas selectivity of ∼6.5 in comparison to ∼5.5 of PDMS/PES, indicating improved gas exchange efficiency. Nevertheless, the PDMS-HEMA/PES composite membrane also displayed excellent and much improved performance in hemocompatibility and long-term stability for storage as well as against blood wetting. Therefore, side-chain modification of hydrophobic PDMS with hydrophilic HEMA through simple chemical copolymerization process is an easy and feasible method to make the membrane surface with long-term amphiphilicity less thrombogenic in contact with blood and more efficient in gas exchanges.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guoying Liu,Junyue Shan,Lijun Cao,Hangqi Zhao,Ce Sun,Haiyan Tan,Yanhua Zhang
The low strength and high hygroscopicity of natural bamboo limit its use in structural building materials. Herein, lignin and hemicellulose were partially removed from natural bamboo in order to create bamboo frameworks featuring well-aligned bamboo fibers. Subsequently, these bamboo frameworks (BF) are infused with epoxy resin (EP) modified with PDMS and subjected to hot-pressing to fabricate bamboo-epoxy composites (PDMS-EP/BF). The incorporation of flexible PDMS chains facilitated intermolecular chain entanglement, which inhibited crack propagation and improved the bonding between bamboo and EP. The findings of the research indicated that the PDMS-EP/BF composites exhibited a significant enhancement in flexural strength by 98%, modulus of elasticity by 129%, toughness by 399%, and tensile strength by 177% when compared to natural bamboo. Additionally, the modification led to a decrease in the surface energy of the composites, resulting in increased hydrostatic contact angle and imparting water repellency to the material. Compared to natural bamboo, PDMS-EP/BF has 309% higher water contact angle and 143% lower surface energy. In addition, large composites have been prepared and their interface strength was tested. The findings of the study offer insights into the potential enhancement of bamboo composites to achieve increased flexural strength, modulus, and toughness. This could expand the utilization and significance of bamboo in the realm of construction materials.
研究领域:
材料科学
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林业工程
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DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 29
·e202401934
·
IF 1.9
Yujie Liu,Xiaoyu Zhang,Xixian Yan,Chi Zhang,Ning Li,Fanglei Zeng,Shengling Jiang,Jianning Ding
Graphical In this study, we introduced hydrogen bonds, metal coordination bonds, π–π bonds, and reversible rings into the poly(siloxane-urethane) system for the first time, achieving a self-healing efficiency of 86.6 % and a mechanical strength of 9.68 MPa when the soft segment (PDMS-OH) addition amount was 1.0 g. This significantly enhanced the mechanical properties of the material while ensuring excellent self-healing efficiency. Self-healing poly(siloxane-urethane) materials have garnered significant interest among researchers, owing to their superior resistance to high and low temperatures, solvents, corrosion, and biocompatibility. Nevertheless, most existing self-healing poly(siloxane-urethane) materials face challenges, including limited repair conditions and the challenge of balancing mechanical properties with repair efficiency. In this research, we introduced hydrogen bonds, metal coordination bonds, π–π bonds, and reversible ring structures into the poly(siloxane-urethane) system through molecular chain structure design, successfully developing a multi-dynamic cross-linked poly(siloxane-urethane) (PU-Si), a development rarely reported in prior studies. This study examines the impact of varying amounts of hydroxyl-terminated polydimethylsiloxane (PDMS-OH) on the properties of PU-Si. The results indicate that PU-Si, regardless of the amount of PDMS-OH added, can self-healing under conditions of heating at 60 °C, and exposure to ultraviolet and infrared radiation. Specifically, when the PDMS-OH addition reaches 1.0 g, the material exhibits superior mechanical properties and self-healing efficiency, achieving a mechanical strength of 9.68 MPa and a self-healing efficiency of 86.6 %. This material shows significant application potential in areas such as electronic skins, flexible sensors, and brain-computer interfaces.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
FOOD CHEMISTRY
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2022
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IF 9.231
Tianhua Xie,Zijin Cao,Yuejing Li,Zhiyan Li,Fan-Li Zhang,Yingqiu Gu,Caiqin Han,Guohai Yang,Lulu Qu
Pesticide residues will be a huge threat to food security and ecological environment; therefore, there is an urgent need to achieve rapid and on-site detection of pesticide residues. Herein, a plasmonic substrate with multiple “hot spots” was fabricated by transferring three-dimensional (3D) Au nanoparticles (NPs) onto the polydimethylsiloxane (PDMS) membrane for highly sensitive surface-enhanced Raman scattering (SERS) detection of pesticide residues. In combination with 3D-FDTD simulations, high SERS enhancement (EF = 1.2 × 10 8 ) and high detection sensitivity (LOD = 6.3 × 10 -10 M) were achieved, mainly due to the enhanced electromagnetic fields around the “hot spots”. Additionally, the PDMS-based SERS substrate held good transparency and flexibility, enabling conformal contact with non-planar surfaces and allowing the laser to penetrate the back of the analytes. Combined with a portable Raman spectrometer, the substrates holds great potential for rapid, high-sensitive, and on-site detection of contaminants in food, especially for the analyte on the nonplanar surfaces.
研究领域:
分析化学
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食品安全
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环境科学
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DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 43
·2204801
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IF 32.086
Fei Zhang,Yingchun Zhou,Zhipeng Chen,Meng Wang,Zhuangzhuang Ma,Xu Chen,Mochen Jia,Di Wu,Jiawen Xiao,Xinjian Li,Yu Zhang,Zhifeng Shi,Chongxin Shan
Flexible scintillator screens with environmental stability, high sensitivity, and low cost have emerged as candidates for X-ray imaging applications. Here, a large-scale and cost-efficient solution synthesis of the vacancy-ordered double perovskite Cs 2 ZrCl 6 , which is characterized by thermal activation delayed fluorescence (TADF) dominated by triplet emission under X-ray irradiation, is demonstrated. The large Stokes shift and efficient luminescence collection of TADF effectively ensure the light outcoupling efficiency. Further, flexible X-ray scintillator screens with an area of 400 cm 2 are prepared using poly(dimethylsiloxane) (PDMS) as the carrier, exhibiting excellent scintillation properties with light yields as high as 49 400 photons MeV −1 , spatial resolutions up to 18 lp mm −1 and detection limits as low as 65 nGy s −1 . Finally, the high-quality imaging results of non-planar and dynamic objects by such screens are demonstrated. It is believed that the explored Cs 2 ZrCl 6 @PDMS flexible scintillator screens would offer a big step toward expanding the application range of scintillators in different environments.
研究领域:
材料科学
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医学成像
·
光学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Jie Yang,Liyuan Liu,Di Zhang,Hongli Zhang,Jianhua Ma,Jiaojiao Zheng,Chen Wang
Accompanying the rapid growth of wearable electronics, flexible pressure sensors have received great interest due to their promising application in health monitoring, human-machine interfaces, and intelligent robotics. The high sensitivity over a wide responsive range, integrated with excellent repeatability, is a crucial requirement for the fabrication of reliable pressure sensors for various wearable scenes. In this work, we developed a highly sensitive and long-life flexible pressure sensor by constructing surficial microarrayed architecture polydimethylsiloxane (PDMS) film as a substrate and Ti3C2TX MXene/bacterial cellulose (BC) hybrid as an active sensing layer. The specific surficial morphology of PDMS couples with nanointercalated structure of Ti3C2Tx MXene/BC can effectively improve the sensitivity through controlling the stress distribution and layer spacing under different levels of pressure loading. In addition, abundant spontaneous hydrogen bonds between BC and Ti3C2Tx MXene nanosheets endow the MXene coating with highly adhesive strength on the PDMS surface; hence, the cyclic stability of the pressure sensor is greatly boosted. As a result, the obtained MXene/BC/PDMS (MBP) pressure sensor delivers high sensitivity (528.87 kPa–1), fast response/recovery time (45 ms/29 ms), low detection limit (0.6 Pa), and outstanding repeatability of up to 8000 cycles. Those excellent sensing properties of the MBP sensor allow it to serve as a reliable wearable device to monitor full-range human physiological motions, and it is expected to be applied in next-generation portable electronics, such as E-skins, smart healthcare, and the Internet of Things technology.
研究领域:
生物医学工程
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材料科学
·
可穿戴设备
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL EDUCATION
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2023
·
IF 3
Si-Ke Chen,Xiao-Jie Ju,Jie Wei,Wei Wang,Liang-Yin Chu
Previous educational articles on microfluidic technology mainly focused on continuous microfluidics, so we set up an undergraduate laboratory experiment to introduce droplet microfluidics to students. Students can understand the concept of microfluidic channels and the principles of droplet microfluidics, prepare polydimethylsiloxane (PDMS) devices and split-flow strategy, explore the controllable preparation and monodispersity of chitosan (CS) microspheres, and gain a more comprehensive understanding of microfluidic technology. The experiment has the advantages of easy operation and a short cycle, and it is suitable as an undergraduate experiment.
研究领域:
生物工程
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材料科学
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化学工程
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DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Jiujuan Li,Yu Zheng,Yuanhao Liu,Binbin Zhang,Xianzhong Tang,Yan Hong,Yuanyuan Ye,Chong Wang,Guoyun Zhou,Yuanming Chen,Yongjie Du,Weiguo Yang,Yu Jiao,Min Zou,Wei He
In this work, a self-healing elastomer involving reversible imine bonds was synthesized by Schiff base reaction between the amino groups in amino-modified polydimethylsiloxane (APDMS) and the aldehyde groups in 1,4-diformylbenzene (DFB). The incorporation of amino-modified multi-walled carbon nanotube (AMWCNT) allowed for good dispersion of AMWCNT with few aggregates and effectively balanced the mechanical properties and self-healing performance, achieving a mechanical strength of 132.3 kPa and a self-healing efficiency ( HE ) of 99.87% at room temperature after 24 h. The reversible imine bond based on the Schiff base linkage promotes quick self-healing upon damage without any external stimulus at room temperature. Through electroless deposition, copper and nickel patterns were formed on the surface of the elastomer, establishing conductive pathways. The average resistivity of the copper trace was 5.40 × 10 −8 Ω·m (3.63 × 10 −7 Ω·m for nickel trace), which is 3.18 times that of regular copper wire (5.19 times for regular nickel wire). Upon cleavage and self-healing of the elastomer with copper lines, with the resistivity increment by 14.43% in average (11.01% for nickel wire). This work offers an alternative pathway to the development of self-healable silicone elastomers for future flexible electronics. Highlights Elastomer with balanced mechanical properties and self-healing performance. Recyclable elastomer through hot-press treatment. Copper patterns were electroless-deposited on the elastomer. Damaged pattern restored conductivity within 24 h at room temperature.
研究领域:
材料科学
·
柔性电子
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高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 6
·1963-1976
·
IF 2.3
Niu Pengfei,Pan Weichen,Wang Wei,Wang Meng,Zhang Bao,Yang Junfeng,Peng Xiaohong
Self-matting waterborne polyurethane (WPU) with a rough surface suffers from poor wear resistance, which inevitably hinders its service span. Here, wear-resistant and self-matting WPU resin was prepared via using hydroxypropyl-terminated polydimethylsiloxane (PDMS) in the preparation of prepolymer and N -2-aminoethyl-3-aminopropyltrimethoxysilane (KH-792) as a post-chain extender. The effects of PDMS, 2, 2-Bis(hydroxymethyl)propionic acid (DMPA), and KH-792 on its morphology, particle size, gloss, wear resistance, and hydrophilicity of WPU were also investigated. The gloss of WPU coatings was found to be negatively correlated with the amount of DMPA. Moreover, the matting effect and the wear resistance of WPU were significantly enhanced by the introduction of PDMS and KH-792. When the content of PDMS, DMPA, and KH-792 was 6 wt%, 2.2 wt%, and 40 mol% respectively, the gloss was 3.2 GU, and the wear mass loss was only 6.6 mg, which was 64% lower than that without silicone-modified. This work could provide a new idea for the preparation of wear-resistant and self-matting coatings.
研究领域:
材料科学
·
高分子化学
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表面工程
·
涂层技术
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DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Jinqiang Wang,Jihong Shi,Xinling Deng,Lingjie Xie,Jinxing Jiang,Jiaqi Tang,Jianfei Liu,Zhen Wen,Xuhui Sun,Kaiqiang Liu,Yu Fang
As a promising energy converter, triboelectric nanogenerator (TENG) demonstrates unparalleled advantages. However, its performance is extremely affected by wear, tear and damage of the functional materials during triboelectrification. In this work, by incorporating tridentate pincer ligand moieties into a linear polydimethylsiloxane (PDMS) chain, the Zn-Pdca-PDMS elastomer for triboelectric layer was synthesized with excellent viscoelastic behaviors , super-stretchability (>5200%), self-healing ability and transparency. As a newly developed strategy, the strength of metal-ligand complex could be tuned efficiently by changing molar ratio of metal ions and ligands and three kinds of anions (CF 3 SO 3 − , BF 4 − , ClO 4 − ) to adapt the desirable material performances. Subsequently, a stretchable, self-healable and transparent Zn-Pdca-PDMS based TENG (ZPP-TENG) was fabricated. With the molar ratio of Zn 2+ to Pdca-PDMS ligand of 2:1, it exhibits the best output performance of 145 V, 6.7 nC cm −2 and 0.74 μA cm −2 , respectively. The self-healable ZPP-TENG was employed as energy harvester to light up LEDs and charge a capacitor to driven electronic watch effectively. Even after several cutting-healing cycles, the output performance of the ZPP-TENG still maintain consistent. Finally, it was demonstrate to be employed a self-powered sensor for monitoring finger movement and pulse wave with excellent repeatability and stability.
研究领域:
材料科学
·
能源技术
·
生物医学工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Guangyou Liu,Zhuohang Li,Zheng Lai,Zhiguang Qiu,MingYang Yang,Xinzao Wu,Zheng Zeng,Shaozhi Deng,Bo-Ru Yang
Cesium lead halide perovskite nanocrystals (PNCs) have attracted great attention in optoelectronic devices due to their excellent optical properties, such as tunable emission wavelengths, long carrier lifetime, and narrow full width at half-maximum (fwhm). However, the poor stability of PNCs in water or humid environments greatly limits their wide-spreading applications. It is challenging to prepare PNCs with long-term stability in water. Herein, we successfully prepared CsPbBr3@PDMS microspheres by using the emulsification method. Due to the protection of the PDMS layer, the CsPbBr3@PDMS microspheres exhibit good optical properties and stability in water, acid, and alkali solutions. In addition, to expand the application of CsPbBr3 NCs in flexible optical devices and wearable devices, we first prepared stretchable, stable, and photoluminescent hydrogel with a CsPbBr3@PDMS microsphere (hydrogel/CsPbBr3@PDMS) by using the emulsification method. The hydrogel/CsPbBr3@PDMS elastomer exhibits good stability and stretchability. Furthermore, the hydrogel/CsPbBr3@PDMS elastomer retains bright green emission and stability under different mechanical deformations. This work provides a method to improve the CsPbBr3 PNCs with high stability by emulsification, which could also expand the applications of PNCs in underwater display, wearable, and flexible optoelectronic devices.
研究领域:
材料科学
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光学工程
·
纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）