IEEE SENSORS JOURNAL
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2024
·
IF 4.3
Yuzhen Li,Yunfei Wang,Yixin Liu,Yuhan Liu,Liuyang Han,Yanru Chen,Juntian Qu,Puxiang Lai,Xiang Qian
Microchannel force sensors have good stretching characteristics, and have garnered a lot of interest in the research area of health monitoring and human movement identification. However, there are still existing a number of problems for such microchannel-based force sensors, such as costly and time-consuming manufacturing procedures, layer mechanical mismatches, and poor instability. Here, we propose a flexible microchannel-based PDMS-MWCNTs composite sensor with high sensitivity and directional stretching response. MWCNTs are inserted into microchannels using the self-diffusion approach, and a unique encapsulating process has been demonstrated that combines MWCNTs with PDMS to create a composite that maximizes interlayer mechanical compatibility. When compared to traditional encapsulation techniques, the novel encapsulating approach tenfold boosts the sensors’ sensitivity within the same pressure detection range. In the range of 0-100 kPa, the sensitivity is up to 0.0433 kPa
-1
, detecting pressures as low as 11.9 pa, while the gauge factor is as high as 18.1. The results demonstrate that the proposed microchannel force sensor has significant promise for the future in the field of motion detection, health monitoring, etc.
研究领域:
材料科学
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生物医学工程
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传感器技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Ziju Wang,Lulu Yang,Shuzheng Zhang,Wenlong Hu,Chaojie Hu,Bin Yang
s To overcome the disadvantages such as local stiffness/strength reduction caused by the embedded sensors in composites structures used for structural health monitoring , we designed a surface pasting film sensor (SPFS) to locate the impact damage in glass-fiber reinforced polymer (GFRP) panels and composite overwrapped pressure vessel (COPV). The SPFS was made by printing MWCNTs/PDMS ink onto a PDMS film substrate. The relative resistance response (Δ R / R 0 ) of the sensing networks was recorded during loading. Sensing performance of SPFSs was evaluated by monitoring damages in GFRP panels with three different thicknesses and assessing three typical positions within a COPV. The experimental results demonstrated that variations in the load magnitude and position can be estimated by Δ R / R 0 shift of the SPFS. The newly designed SPFS shows superior accuracy in in-situ detecting damages in FRP structures. The maximum root mean square error for damage localization is 4.45% in GFRP panels and 4.27% in COPV. The presented concept provides a novel approach for early detection of damages in FRP structures, offering advanced warning without disrupting their inherent integrity.
研究领域:
材料科学
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结构健康监测
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
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IF 4.3
Heng Guo,Hongji Li,Mengyang Xu,Juan Zhou,Dan Zhang,Dandan Wang,Wei Sun
In this study, a core–shell structured bimetallic nano-cube, Au@Ag NCs, was prepared by seed-mediated growth procedure. The array structure of Au@Ag NCs was achieved at the interface through the autonomous assembly technique at the three-phase boundary. Employing polydimethylsiloxane (PDMS) as a flexible carrier, the array structure was effortlessly transferred to the PDMS membrane, bypassing the need for rigid substrates through a simple “pasting” method. This yielded a highly flexible and transparent SERS substrate with an array structure (Au@Ag NCs/PDMS membrane, AAP). In order to promote the selective detection property to the practical samples, molecularly imprinted polymers (MIPs) were coated on the surface of membrane to prepare the imprinted membrane (Au@Ag NCs/PDMS-MIMs, AAP-MIMs). It was demonstrated from the results that the AAP-MIMs exhibited high SERS sensitivity, stability, and uniformity. Furthermore, the flexible substrate possessed commendable mechanical strength, and facilitated the detection of analytes on irregular surfaces. In summary, this substrate held promising potential for practical on-site detection and analysis of specific target substances.
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuaishuai Zhou,Huanhuan Zhang,Qian Chen,Qing-wen Yuan,Sen-hao Zhang,Nannan Bao,Jin-Ping Qu
Flexible and stretchable sensors are increasingly being developed to conformally attach to skin or organs for monitoring human activity. However, due to agglomerations of nanofiller, the preparation of a strain sensor for conductive elastic polymer with high sensitivity and wide detection range remains a major challenge. Herein, a conductive network is refined in PDMS/MWCNTs composites using an elongational flow field. This well-formed 3D MWCNTs network endows the nanocomposite with a high sensitivity and wide detection range for strain deformation. Moreover, it exhibits excellent recovery and reconstruction capabilities during strain deformation, ensuring exceptional cyclic stability for the sensing material. In particular, the fabricated composite (4 wt% MWCNTs) with good tensile strength (8.1 MPa), exhibits high sensitivity (1151), a wide detection range exceeding 200 % strain, and good stable performance over 2000 stretch-release cycles under 30 % strain. Consequently, the strain sensor made from PDMS/MWCNTs composites can detect subtle actions and larger joint movements, exhibiting a good discriminative ability. In addition, the sensor is successfully applied to detect and recognize human lifting movements based on a big data model, highlighting the potential application in smart wearable devices. This work presents a new strategy for obtaining a highly sensitive PDMS-based sensor with a wide sensing range for human motion detection by fabricating an optimized conductive network.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Ruoxin Hu,Zhenbo Cai,Lijun Ji,Yanyang Wu,Xiaohua Ma
Recovery of valuable aromatic compounds from tobacco waste is important, and efficient separation methods remain highly demanding. This work proposed a hybrid PDMS membrane for high flux aromatic compounds recovery. MCM-41, a silicone-based molecular sieve, was selected to fabricate the membrane to improve the pervaporation performance. The prepared MCM-41/PDMS membrane was investigated in model aqueous solution at different concentrations and temperatures. The optimal pervaporation fluxes of the MCM-41/PDMS membrane achieved 0.95 g/(m 2 ·h), 0.51 g/(m 2 ·h), and 0.26 g/(m 2 ·h) for 2-phenylethanol, β-ionone, and dihydroactinidiolide, respectively, exhibiting superior performance to the PDMS membrane. Moreover, the long-term stability of the hybrid membrane was examined with practical tobacco extract. The average fluxes were 41.20 mg/(m 2 ·h), 20.57 mg/(m 2 ·h), and 9.73 mg/(m 2 ·h), respectively. The hybrid PDMS membrane in this study, with high permeate flux and selectivity, is promising for recovery of aromatic compounds particularly from tobacco waste.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jingxian Hua,Chang Li,Hongxu Tao,Lei Wang,Eryue Song,Haiqian Lian,Chongqing Wang,Jinlong Jiang,Yichang Pan,Weihong Xing
Polymer coating post-treatment strategy of the zeolitic imidazolate framework (ZIF) membranes offers a versatile and feasible opportunity to restrict the intrinsic flexibility of ZIF framework and improve their gas separation performance. Herein, two different coating methods (Vacuum-assisted drip coating (VADC) and Static drip coating (SDC)) are utilized to prepare PDMS/ZIF-8 composite membranes based on ZIF-8 membranes with different compactness (high, medium and low-quality membrane) for investigating the effect of the contact area between PDMS layer and ZIF-8 membrane on C 3 H 6 /C 3 H 8 separation performance of PDMS/ZIF-8 composite membranes. The results reveal that the increase of the contact between PDMS layer and ZIF-8 membrane can enhance the contact confinement effect on the flexibility of ZIF-8 framework, resulting in a higher improvement of the separation performance for C 3 H 6 /C 3 H 8 of PDMS/ZIF-8 composite membranes with pressure. The prepared composite membrane based on VADC method showed a significant improvement in C 3 H 6 /C 3 H 8 separation factor (77–102) with slight increase in C 3 H 6 permeance (about 10%) at feed pressure of 7 bar. Moreover, this facile vacuum-assisted drip strategy attenuated the impact of the quality of ZIF-8 membranes on fabrication reproducibility of the composite membranes, which can withstand high pressure. Therefore, this work advances ZIF-8 membrane moving forward to industrial C 3 H 6 /C 3 H 8 separation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2023
·Vol. 31
·期 10
·16484-16494
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IF 3.8
Sha HaiYang,Wang Zhengkun,Zhu Yong,Zhang Jie
To achieve high sensitivity and uniformity simultaneously in a surface-enhanced Raman scattering (SERS) substrate, this paper presents the preparation of a flexible and transparent three-dimensional (3D) ordered hemispherical array polydimethylsiloxane (PDMS) film. This is achieved by self-assembling a single-layer polystyrene (PS) microsphere array on a silicon substrate. The liquid-liquid interface method is then used to transfer Ag nanoparticles onto the PDMS film, which includes open nanocavity arrays created by etching the PS microsphere array. An open nanocavity assistant soft SERS sample, “Ag@PDMS,” is then prepared. For electromagnetic simulation of our sample, we utilized Comsol software. It has been experimentally confirmed that the Ag@PDMS substrate with silver particles of 50 nm in size is capable of achieving the largest localized electromagnetic hot spots in space. The optimal sample, Ag@PDMS, exhibits ultra-high sensitivity towards Rhodamine 6 G (R6G) probe molecules, with a limit of detection (LOD) of 10−15 mol/L, and an enhancement factor (EF) of ∼1012. Additionally, the substrate exhibits a highly uniform signal intensity for probe molecules, with a relative standard deviation (RSD) of approximately 6.86%. Moreover, it is capable of detecting multiple molecules and can perform real detection on non-flat surfaces.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Science China-Technological Sciences
·
2021
·Vol. 65
·期 1
·179-190
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IF 3.572
Qi YuHao,Zheng JunPing
A wearable UV sensor is designed to realize UV detection and a warning effect on people’s excessive UV exposure. It is noteworthy that the photoelectric system and supporting material of the most conventional sensor are separated. The unstable connection between the two components and the complicated construction method makes the sensor susceptible to external motion interference and prone to failure. Herein, we developed a unique photo response mode of the UV sensor based on a novel photo responsive material. An azobenzene-containing polydimethylsiloxane (Azo-PDMS) film was prepared as the outer layer of the sensor. It integrated the functions of photo response source, support and protection, which realized the direct contact and rapid response to the UV light source. Carbon nanotube (CNT), wrapped in the middle of Azo-PDMS films as an inner layer, transformed the photomechanical response signal into the photoelectric signal. The photo response mode endows the sensor with excellent anti-motion interference capabilities and a true sense of UV-strain synchronous monitoring performance, which is of great significance to the practical application of wearable devices. In addition, based on the excellent properties of Azo-PDMS, the sensor can also protect the human body from UV damage, self-repair after fracture, and realize personalized customization through 3D printing. It makes a breakthrough in the design and construction of wearable UV sensors and paves a new way to optimize sensor photo response modes.
研究领域:
材料科学
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生物医学工程
·
传感器技术
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Yong Pan,Tengyang Zhu,Qing Xia,Xi Yu,Yan Wang
Emerging pervaporation technology is very promising to realize clean and renewable bioethanol recovery from biomass fermentation broth. The huge challenge of this technology is the need for a pervaporation membrane with high separation performance. Based on the solution-diffusion mechanism, pervaporation membrane for ethanol recovery should possess hydrophobic selective layer to improve sorption ability toward ethanol molecules, thereby enhancing the separation performance. In this study, a superhydrophobic zeolitic imidazolate framework-8 (ZIF-8) layer with a nano-level bud-like surface morphology was grown on polydimethylsiloxane (PDMS) composite membrane via ZIF-8 particle dip-casting, secondary seeded growth, and hydrophobic modification by n-octadecylphosphonic acid for highly efficient ethanol/water separation. The mole ratio of 2-methylimidazole and zinc nitrate (Hmim/Zn 2+ ) in the process of ZIF-8 secondary growth was systematically studied to construct appropriate micro-nano structure on PDMS composite membrane. The resultant optimal composite membrane exhibited a water contact angle of about 163° and an ethanol contact angle of 0°. In addition, it also displayed an outstanding separation factor of 17.4 corresponding to a total flux of 0.64 kg/m 2 h with 5 wt% ethanol aqueous solution at 30 ℃, and thus the superior pervaporation performance to most other reported PDMS-based mixed matrix membranes. The strategy of constructing superhydrophobic layer on PDMS composite membrane may provide a meaningful guidance for preparing high-performance pervaporation membrane for organic recovery from aqueous solution.
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
CELLULOSE
·
2019
·Vol. 26
·期 17
·9335-9348
·
IF 3.917
Yang Yingying,Huang Wei,Guo Zengpei,Zhang Shiyu,Wu Feng,Huang Jingjing,Yang Hongjun,Zhou Yingshan,Xu Weilin,Gu Shaojin
Abstract Superhydrophobic cotton fabrics with improved ultraviolet resistance were prepared via in situ growing NH 2 -MIL-125(Ti)(Ti-MOF) nanoparticles on cotton fibers and subsequently coating with polydimethylsiloxane (PDMS) under room temperature. The synergetic effect of Ti-MOFs nanoparticles and PDMS was critical and essential for obtaining a superhydrophobic coating with anti-UV property. The surface microstructure, chemical composition, and superhydrophobic property of the as-prepared fabrics were characterized by K/S value, scanning electron microscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, and water contact angle (WCA) measurements. The as-prepared cotton fabrics not merely exhibited desirable superhydrophobic property with a water contact angle (WCA) of 154.7 ± 0.7° and a sliding angle of 3.6°, but also displayed the considerable UV resistance. The oil–water separation, stability of UV protection and superhydrophobicity were also investigated. The superhydrophobicity, anti-ultraviolet property, and K/S value of as-prepared PDMS/Ti-MOFs@cotton fabrics were stable after 300 cycles of abrasion and 5 cycles of washing. The facile synthesis technique provided a simple method for scalable construction of multifunctional fabrics. Graphic abstract
研究领域:
材料科学
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纺织工程
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hui Liu,Li Zhang,Jianying Huang,Xiaoli Zhang,Jiajun Mao,Zhong Chen,Qinghui Mao,Mingzheng Ge,Yuekun Lai
Superwetting materials with multiple functions have drawn heightened attention due to their delicately adjustable surface wettability . However, realizing the full potential of diversified functions is often hampered by the usually symmetrical wetting state. Herein, we introduce a versatile electro-spraying technique to construct a patterned PDMS/PMMA coating with asymmetrical wettability. The tunable superwetting patterns are able to achieve the required functional diversity. The as-prepared superhydrophobic fabric can act as a separation filter with a high separation efficiency and satisfactory cycling ability. With the wettability difference, such patterned surfaces can also manipulate the successive drops motions, and relation between the surface patterns and the controllable movement is demonstrated. In addition, the patterned surface can serve as a smart signal-expression membrane, thereby enabling real-time variable liquid signal expression with alterable signals. The exciting results have paved the way for expanding the application foreground of smart superwetting materials in microfluidics and signal-detection.
研究领域:
材料科学
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微流控技术
·
表面工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Zhiwen Chen,Jingchen Ma,Xiaoyu Zhang,Aixiang Wei,Ningqi Luo,Yuding He,Yu Zhao,Zhen Liu,Jiaxiong Xu
Designing and fabricating flexible piezoresistive pressure sensors (FPPS) with simultaneous high sensitivity and a broad linear working region remains a considerable challenge. In this work, thermoplastic polyurethane (TPU) fiber films were first prepared via electrospinning. Then, the CNTs were anchored onto the surface of a TPU fiber films via ultrasonication as the driving force. Finally, polydimethylsiloxane (PDMS) was used to modify the CNT/TPU and obtain the PDMS/CNT/TPU composite materials. The electrical and mechanical properties of CNT/TPU and PDMS/CNT/TPU were studied. The sensor performances of FPPS based on CNT/TPU and PDMS/CNT/TPU were analyzed and compared. These results prove that the sensitivity of FPPS is significantly improved after the PDMS modification. The optimized PDMS/CNT/TPU FPPS has a sensitivity of 1.43 kPa −1 in a ultra-broad linear working region of 0–2500 kPa and cycling stability over 6000 cycles. FPPS has been successfully used to monitor physiological signals and human movements, which indicates great potential for wearable electronics and human-machine interfaces.
研究领域:
材料科学
·
生物医学工程
·
传感技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）