SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ao-Shuai Zhang,Shen-Hui Li,Li-Hao Xu,Heng Mao,Zhi-Ping Zhao
Mixed matrix membranes (MMMs) filled with dispersed nanoparticles may not favor all requirements for high separation performances due to the discontinuity in molecular permeation pathways. Here, we reported polydimethylsiloxane (PDMS) based MMMs by incorporating one-dimensional (1D) ZIF-8 tubes for the pervaporation (PV) recovery of ethyl acetate (EtOAc) from its diluted aqueous solution. The 1D ZIF-8 is a tubular structure formed by the ZIF-8 crystal particles inlaying each other, some windows between the ZIF-8 crystal particles are seamlessly connected, so that the cavities of the ZIF-8 are connected through the windows. The ZIF-8 tubes not merely possess microporous and molecular sieving properties, but also are inherently continuous in the integral morphology. The morphological continuity renders docking micropores along the tube body, which can act as efficient molecular permselective pathways for EtOAc molecules. Both the short and long-sized ZIF-8 tubes (STZIF-8 and LTZIF-8) played greater roles in facilitating PV performances than that of dispersed nanoparticles. Importantly, the most remarkable effect of the LTZIF-8 on separation performance was obtained since their micron-sized continuous structure, connected cavities and lumen, is more conductive to the separation process. The MMMs with 8% loading of the LTZIF-8 exhibited superior separation factor of 591.9 and EtOAc flux of 0.82 kg·m −2 ·h −1 for separating 1 wt% feed solution at 30 °C, which are 3.11 and 3.45 times of that of PDMS membrane, respectively. This study may give inspiration for developing high-performance MMMs by incorporating such morphologically continuous, microstructurally porous and molecular sieving fillers as permselective pathways for guest molecules.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 6
·849-858
·
IF 3.1
Dandan Li,Xinxing Jiang,Yaxue Zhang,Wenxia Xue,Jihong Fu
A novel approach based on polydimethylsiloxane/graphene oxide/deep eutectic solvent (PDMS/GO/DES) sponge headspace solid phase extraction followed by GC-MS was successfully developed to determine the volatile components in cumin. The PDMS/GO/DES exhibits outstanding properties with high adsorption capacity and good chemical stability, and has shown its potentiality as an ideal adsorbent for the extraction of volatile compounds. The influence factors of the extraction process were investigated. Excellent analytical performances were achieved, including wide linearity (0.60–107.72 ng) with high correlation coefficients (R2 ≥ 0.9951), low LODs (0.23–9.23 ng) and LOQs (0.54–18.47 ng), satisfactory precision (intra-day RSDs ≤ 2.85% and inter-day RSDs ≤ 3.92%). Under the optimal extraction conditions, the volatile components in 17 cumin samples from four origins in Xinjiang were analyzed and 31 compounds were identified. PCA was used to establish the relationship between the origins and the volatile compounds for further discriminant analysis. The results showed that the PDMS/GO/DES method was a rapid, simple and sensitive technique for the analysis of volatile components in spices.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Xiaosen Su,Weilin Liao,Fei Fang
Flexible piezoelectric energy harvesters (FPEHs) made of polymer-based piezoelectric composites are urgently needed for powering wearable electronics. Employing water-based freeze casting and emulsion-template method, a porous structured Barium titanate(BaTiO 3 )/PDMS composite is obtained, which combines the piezoelectric ceramics with piezoelectric electret. For the BaTiO 3 ceramic skeletons, three different pore arrangements are obtained by utilizing flat-bottomed mold, wedge-shaped mold and round-table mold. The ceramic skeletons are then encapsulated with the PDMS matrix with and without porous forming ingredient. Finite element simulation is carried out to reveal the influence of the alignment of BaTiO 3 skeleton and porous PDMS on the piezoelectric behavior. The output performance is investigated for the BaTiO 3 /PDMS composite upon a vibration exciter, as well as human motion. It is found that the BaTiO 3 skeleton with a scattered porous structure aligned in the horizontal direction, encapsulated with a porous PDMS possesses the most prominent output voltage and power, reaching 6.63 V and 26.46 μW, respectively upon a compressive load of 21 N at 8 Hz. Moreover, a smart insole based on the porous structured BaTiO 3 /PDMS piezocomposites with both energy harvesting and posture recognition functions is constructed. The open-circuit voltage of the smart insole reachs 40 V in jumping states, and can successfully power an alarm clock. The study offers a new approach for designing of the flexible piezoelectric composites for applications in energy harvesting and posture recognition.
研究领域:
材料科学
·
能源技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Alsamani A.M. Salih,Chunhai Yi,Hailing Peng,Bolun Yang,Lijuan Yin,Wei Wang
Polyether based thin film composite (TFC) membranes were developed by interfacial polymerization (IP) on polysuylfone (PSf) ultra-filtration membrane with poly (dimethylsiloxane) (PDMS) inter-layer. Polyetheramine (PEA) and Trimesoyl Chloride (TMC) were selected as aqueous monomer and organic monomer, respectively. The thickness of the PDMS inter-layer was 550 nm, while IP separation layer was only 100 nm. The effects of the PDMS inter-layer and the PEA molecular weight on the TFC membrane performance were investigated. The gas permeation results show that the TFC membrane with PDMS inter-layer exhibits higher CO 2 /N 2 selectivity compared to the membranes without PDMS inter-layer. PDMS inter-layer is able to eliminate the defects on the support membrane and diminish the TMC hydrolysis as well. Among the membranes prepared with three different molecular weight PEAs (ED-600, ED-900 and ED-2003), the membrane of ED-900 exhibits the best performance with an impressive CO 2 permeance of 360 GPU and CO 2 /N 2 selectivity of 67.2 for a mixture CO 2 /N 2 (20/80 by volume), while for a mixture of CO 2 /CH 4 (10/90 by volume) it demonstrates CO 2 permeance of 275 GPU and CO 2 /CH 4 selectivity of 31.6.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ning Kang,Sheng Zhang,Fu Tang,Jie Wang,Lidong Li
Hydrogels have recently emerged as promising candidates for wearable strain sensors. However, their poor mechanical stability and fragility limited their applications in many fields. Inspired by the skins, we developed a double-layer structured silver-Hydrogel/PDMS composite film (Ag-Hydrogel/PDMS) by chemically bonding the PDMS with a conductive Ag-Hydrogel layer. After assembled with the zinc, air electrodes and a fixed resistor, a self-powered Ag-Hydrogel/PDMS strain sensor was obtained. The mechanical properties of the Ag-Hydrogel/PDMS strain sensor was significantly enhanced due to the chemically bonded PDMS film. Compared to PDMS and Ag-Hydrogel alone, the tensile stress of Ag-Hydrogel/PDMS composite film increased by 3.4 and 58.1 times, respectively. The prepared Ag-Hydrogel/PDMS composite film could easily lift a 1050 g item without obviously interfacial failure. And it could output different voltage signals upon various finger motions without any external power supplies. Interestingly, the inert nature of PDMS also greatly improved the anti-interference property of the Ag-Hydrogel/PDMS strain sensor, as it protected the Ag-Hydrogel from the complicated environments. Moreover, excellent antibacterial activity of the Ag-Hydrogel/PDMS strain sensor against both of the E. coli and S. aureus bacteria was observed, which could be ascribed to the distribution of Ag nanocubes in the hydrogel matrix. The hydrophobic property of the PDMS layer further entitled the Ag-Hydrogel/PDMS strain sensor with a good bacterial anti-adhesion property. These characteristics guarantee the self-powered Ag-Hydrogel/PDMS strain sensor with potential application as wearable and portable electronic devices in complicated environments.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
npj Materials Degradation
·
2025
·Vol. 9
·期 1
·1-14
·
IF 7.6
Xiang Tengfei,Chen Xuxin,Wang Jihuai,Liu Di,Cui Linjing,Wang Tao,Zhang Zhenya,Yang Yang,Zhang Shihong
Metal corrosion poses significant economic and safety challenges across industries, necessitating efficient cathodic protection strategies. Triboelectric nanogenerator (TENG) offers a promising self-powered solution by harvesting ambient mechanical energy. This study presents the design of TENG based on fluorinated ZIF-67/PDMS (F-ZIF-67/PDMS) composites for enhanced cathodic protection of 304 stainless steel (304SS). The present study integrates dual regulation of microstructure and surface energy to synergistically enhance the triboelectric performance. While loading 5 wt.% ZIF-67, the TENG achieved remarkable output performance with an open-circuit voltage of 187.14 V, short-circuit current of 37.46 μA, and transferred charge of 72.54 nC, delivering a peak power of 3.08 mW. When integrated with a cathodic protection system, the TENG significantly reduced the open-circuit potential (OCP) and the corrosion rate. This work advances the integration of MOF-based triboelectric materials with energy harvesting technologies, offering a sustainable approach to mitigating metal corrosion.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能量收集
·
腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2021
·
IF 7.711
Yintao Li,Zisheng Luo,Gangfeng Li,Tarun Belwal,Li Li,Yanqun Xu,Bin Su,Xingyu Lin
In the present study, a novel electrochemical sensor for the direct detection of caffeine in the crude sample has been prepared by plasma-triggered polydimethylsiloxane (PDMS) deposition on the indium tin oxide electrodes supported with silica nanochannels. The deposited PDMS contains both the original hydrophobic and oxidized hydrophilic PDMS oligomers. Nanochannels modified with these two kinds of PDMS with opposite wettability only allow the passage of small amphiphilic molecules such as caffeine, while other molecules including hydrophilic, hydrophobic, and large ones were all rejected. With the excellent shielding properties, the modified nanochannel electrode exhibits excellent anti-interference and antifouling capability, which could be directly used for the detection of caffeine in real crude food such as tea, milk, coffee, and coke without sample pretreatments. Moreover, the modified electrode has good repeatability and stability. In contrast, severe interference was observed when conventional electrodes were used directly in these unprocessed samples. The linear ranges of caffeine were determined to be between 50 nmol/L and 700 μmol/L, with a limit of detection of 20 nmol/L. The developed sensor provides a very simple, rapid, and cost-effective way for the interference-free and fouling-free analysis of specific amphiphilic compounds and can be extended to a wide range of applications.
研究领域:
分析化学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Particuology
·
2022
·
IF 3.251
Yukui Gou,Yuanye Hao,Weilong Cai,Jianying Huang,Yuekun Lai
Particulate matter (PM) is a significant danger to both environment and human health. Despite the development of a series of air filters, they do not work well in harsh environment such as high temperature, high humidity or long-time filtration. To make a three-dimensional (3D) particle capture device, a sacrificial template approach was used to manufacture polydimethylsiloxane (PDMS) sponge, and then zeolite imidazole framework-8 (ZIF-8) was grown in situ on the 3D network of PDMS sponge. The removal efficiency of PM 2.5 or PM 10 is greater than 99.8% because of the high specific surface area and porous network structure of PDMS sponge, as well as the large number of metal sites of ZIF-8. In addition, the sponge filter has long-term filtration stability and still achieves excellent performance after 65 h of filtration. The composite sponge can adapt to harsh environments such as high temperature (250 °C) and high humidity (90% RH). Composite sponge filter has a regular shape, and it may be customized to any shape as required. This study provides a new idea for designing 3D high-efficiency air filters that can adapt to harsh environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Mei Fang,Qi Li,Daozheng Yang,Bing Zhou,Yuezhan Feng,Chuntai Liu
Effective utilization of abundant solar energy can help alleviate the global energy shortage. In this work, a flexible sandwich structured transparent photothermal film was prepared by sequentially spray coating MXene conductive layer as core, and spin coating polydimethylsiloxane (PDMS)-Fe 3 O 4 protective layer as skin onto polycarbonate (PC) substrate. Due to the synergistic light-to-heat conversion effects of MXene and Fe 3 O 4 nanoparticles, as well as the thermal insulation effect of PDMS layer that prevent heat from diffusing into air, the obtained PC/MXene/PDMS-Fe 3 O 4 films (PMPF 0.5 ) exhibited a satisfying photothermal conversion performance (72.6 °C at 100 mW/cm 2 ) with high visible transmittance exceeding 54%. Moreover, the PDMS-Fe 3 O 4 coating endowed the film with high hydrophobicity (120°), expanding its application in humid environment. Combing with these excellent photothermal performance, transparency, flexibility and hydrophobicity, PMPF film exhibits a highly potential using in space thermal management, such as greenhouses.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Mengyue Zhou,Dong Guo,Zhigang Tang,Ullah Shafqat
Nowadays, Carbon capture and storage (CCS) are widely studied as a way of reducing greenhouse emissions and slowing down global warming . Integrated solvent absorption-membrane desorption is a novel CO 2 pre-combustion capture technology with the advantage of relatively low energy cost. Herein, the mixed matrix membranes (MMMs) were synthesized through a facile in-situ method for enhanced desorption of CO 2 from dimethyl carbonate (DMC). ZIF-8 nanoparticles were synthesized in situ on polydimethylsiloxane (PDMS). The morphology, microstructure and thermal stabilities were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and thermal gravimetric analyzer (TGA). Results revealed that fabrication of ZIF-8 nanoparticles on PDMS matrix greatly increased CO 2 flux of the membrane without any leakage of DMC. The membrane showed superior performance with increase of temperature and feed pressure. In particular, PPM-4 exhibited the highest CO 2 flux of 2670 g/ m 2 ·h at 0.4 MPa (20 °C) with the feed flow rate of 0.8 L/min. It was found that the use of DMC absorption-PDMS membrane desorption technology significantly reduces the cost of CO 2 capture. The enhanced performance of this combination of a new absorbent and mixed matrix membranes will open new routes for future CO 2 capture systems.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qian Chen,Yuying Cao,Yan Lu,Wasim Akram,Song Ren,Li Niu,Zhe Sun,Jian Fang
Hybrid piezoelectric/triboelectric nanogenerators combine the merits of piezoelectric nanogenerators (PENGs) and triboelectric nanogenerators (TENGs), possessing enhanced electrical output and sensitivity. However, the structures of the majority of hybrid nanogenerators are rather complex in integrating both functions, limiting their practical application in wearable electronics. Herein, we propose to construct a piezoelectric/triboelectric hybrid nanogenerator (PT-NG) with a simple structure based on a composite film to simultaneously achieve the coupling of piezoelectric charge generation and triboelectrification with improved energy conversion efficiency. The composite film consists of electrospun PVDF nanofibers embedded in the surface of the PDMS film, which not only forms a rough nanomorphology on the surface of PDMS but also provides structural protection to the PVDF nanofibers by PDMS during compressive deformation. The results have shown that the PT-NG can generate much higher electrical outputs than individual TENG and PENG devices. The PT-NG devices exhibit a high level of mechanical-to-electrical energy conversion efficiency with superior performance in charging capacitors and functioning as self-powered wearable sensors for the detection of different signals from finger movement, the recognition of various gestures, and the monitoring of respiration. More importantly, the composite device possesses an impressive structure durability, maintaining its layered structure over 5000 testing cycles without noticing any obvious damage on the nanofibers or detachment between the layers. Our results have demonstrated that the combining of piezoelectric nanofibers and triboelectric substrate is an efficient way to fabricate highly efficient energy harvesting devices for intelligent identification and health monitoring.
研究领域:
材料科学
·
能源技术
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomimetics
·
2022
·Vol. 7
·期 3
·132
·
IF 3.743
Fengqin Li,Yong Liu,Honggen Zhou,Guizhong Tian
In this paper, a superhydrophobic biomimetic composite coating was fabricated on brass by electrochemical etching, brushing PDMS adhesive layer, and depositing carbon soot particles. Due to the microstructure and the optimized ratio of PDMS, the contact angle of the superhydrophobic coating is up to 164° and the sliding angle is only 5°. The results of optical microscopy and morphometric laser confocal microscopy show that the prepared coating surface has a rough hierarchical structure. A high-speed digital camera recorded the droplet bouncing process on the surface of the superhydrophobic coating. The self-cleaning property of the coatings was evaluated by applying chalk dust particles as simulated solid contaminants and different kinds of liquids (including grape juice, beer, cola, and blue ink) as liquid contaminants. The coating remained superhydrophobic after physical and chemical damage tests. This work presents a strategy for fabricating superhydrophobic biomimetic composite coatings with significant self-cleaning properties, durability, and shows great potential for practical engineering applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）