REACTIVE & FUNCTIONAL POLYMERS
·
2018
·
IF 2.975
Yufeng Lei,Shengwen Zhou,Chenyun Dong,Anqiang Zhang,Yaling Lin
Quaternary ammonium salts are widely used as epidermal and topical antimicrobial agents in medical treatments due to their broad activity, excellent performance and ready availability. However, their epidermal application has revealed many noticeable disadvantages, including short-term functionality, environmental toxicity, rapid antimicrobial resistance and skin penetration. Here, a series of tri-block copolymers grafted with dimethylaminopropyl benzyl chloride and based on a polydimethylsiloxane (PDMS) backbone, referred to as PDMS- b -(PDMS- g -BC)- g -PDMS, were prepared with well-controlled chain length and cationic grafting content. The quaternary ammonium salt-containing polymers were effective antimicrobial agents against epidermal pathogenic microbes, such as E. coli , S. albus and C. albicans . By incorporating hydrophilic and antimicrobial quaternary ammonium salt groups into the hydrophobic PDMS backbones, the amphiphilic tri-block copolymers were water-soluble but capable of assembling onto different surfaces, driven by electrostatic attraction or hydrophobic repulsion, which yielded long-term functionality on the surface. Moreover, the enlarged molecular size prevented penetration though full-thickness rat skins. These findings suggest a promising application of polymeric quaternary ammonium salts with hydrophobic moieties as epidermal antimicrobial agents.
研究领域:
材料科学
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化学
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生物医学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Jiawei Sun,Hengchang Bi,Haiyang Jia,Shi Su,Hui Dong,Xiao Xie,Litao Sun
The pollution of water resource and shortage of clean water have become increasingly severe, developing an urgent demand of reliable, efficient yet low-cost material for everyday water purification . In the present work, a superhydrophobic paper tissue-based SiO 2 /PDMS composite has been prepared for both oil absorption and water-in-oil emulsion separation. The fabrication process is quite simple since it takes the full advantage of tissue that has naturally strong capillary force of which allows the material to absorb oil from water much more rapidly and completely (>99.9%) even under harsh conditions. The study has shown the novel material is exceptionally efficient in separating water-in-oil emulsion under gravity but no need of extraneous pressure. A variety of emulsions has been proven with high flux (>2,000 L m −2 h −1 ) and high separation efficiency (>99.4%). It is believed that this study has proposed a highly reliable and efficient, low cost strategy in both oil absorption and water purification , which shed light on water treatment of both civil use and industry.
研究领域:
环境科学
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材料科学
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水处理
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化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Xiaofeng Nie,Yuan Luo,Penghui Shen,Chengwu Han,Duli Yu,Xiaoxing Xing
Dielectrophoresis (DEP) as a label-free cell separation approach in microdevices has been extensively investigated for a variety of applications. 3D microelectrodes made of conducting-PDMS inherit the merit of volumetric electrodes for generating influential DEP force throughout the entire channel depth and meanwhile, exploit low-cost fabrication process by soft lithography. However, the configuration of conducting-PDMS electrodes is limited to being embedded in sidewall of flow chamber, which leads to rather low flow rate and difficulties in extension of the flow rate. We previously reported a more effective configuration with 3D interdigitated electrodes made of silicon that assist cell sliding along solid tracks, yet such device requires expensive silicon dry etching and, moreover, the track appears to be patterned with non-straight and wavy outline, which not only hinders the flow rate but also allows cell sliding to occur only along its downstream side. Here we demonstrate low-cost silver-PDMS electrode-track featuring ideally straight outline that induces rather uniform drag to drive smooth cell sliding. Such design achieves live and dead cell separation at flow rate twice as that of silicon tracks with cell loading concentration 10 times higher. It also fully utilizes the track to enable cell sliding on both of the up- and down-stream sides. Notably, we also demonstrate that this track is expandable to be V-shape for more advanced bidirectional cell sliding, which is showcased here by tumor cells separation from lymphocytes at 1.2 mL/h. Such results greatly enhance the throughput as compared to the state-of-art conducting-PDMS based cell separator.
研究领域:
生物医学工程
·
微流控技术
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细胞分离
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Xiaojing Su,Guoxiang Qin,Pingping Deng,Kunquan Li,Huali Xie,Wenjian Wu
Self-cleaning films with superhydrophobicity and photocatalytic capability have attracted considerable interest in recent years for the synthetical chemical and physical self-cleaning performance to overcome individual inherent limitations. In the present work, a dual-functional self-cleaning film is proposed through the design of polydimethylsiloxane (PDMS) nanopillar array, swelling absorption of anatase-typed TiO 2 nanoparticles , and final low-surface-energy modification of 1 H ,1 H ,2 H ,2 H -perfluorodecyltrimethoxysilane (PFDTS). Benefiting from the hierarchically mountain-like structure constructed by the PDMS nanopillar array and swelling absorbed TiO 2 nanoparticles , the self-cleaning film presents a robust superhydrophobicity to resist chemical and mechanical damages (e.g. solvent/acid/alkali immersion, stretching, water impact, and sand abrasion). Combining the photocatalytic activity with adequate loading of TiO 2 nanoparticles, the self-cleaning film demonstrates a great degradation capability of organic pollutants with a degradation efficiency over 98 %. Importantly, owing to the superhydrophobicity repairability induced by the migration of fluorocarbon chains, the self-cleaning film can highly recover the water repellency with a water contact angle (WCA) of 155 o even after long-term irradiation under UV light. The findings conceivably promote the development and application of the self-cleaning materials with superhydrophobic and photocatalytic properties.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 20
·2475-2485
·
IF 3.4
Yi Wang,Yu Miao,Yuxin Cai,Enfu Wang,YiPeng Liang,Jinhuan Zhong,Wenbiao Zhang,Jingda Huang
Development of water-soluble polymer air filtration materials attracts considerable attentions due to their environmentally friendly performance and high efficiency, but the balance of mechanical strength, efficiency and pressure drop still is a severe challenge. Focusing on this issue, polyvinyl alcohol (PVA), bamboo activated carbon (BAC) and sodium lignosulfonate (Ls) were combined to construct an electrospinning system with two filtration functions. In the PVA@Ls@BAC system, the 3D network constructed by the electrospun PVA based nanofibrous could effectively intercept PM2.5, and the introduced Ls enhanced the mechanical strength of PVA nanofibrous due to its good rigidity. In addition, the added negatively charged BAC facilitated the electrostatic adsorption of PM2.5 while also improved the heat resistance of the system. Moreover, polydimethylsiloxane (PDMS) was introduced to enhance the water resistance of the system. The resulting electrospun PVA@Ls@BAC@PDMS composite nanofibrous air filtration membrane exhibited excellent air filtration performance (98.67%), water repellency (123.7° of WCA), and reusable performance, as well as having good mechanical property and the tensile fracture strain reaching 112%. Because of its good performance and simple preparation process, the electrospun PVA@Ls@BAC@PDMS composite nanofibrous air filtration membrane has great application space. Graphical
研究领域:
材料科学
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环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Guangmeng Chen,Ming Mu,Wenjie Yu,Li Jia,Ziqiang Hu,Weiwei Zhao,Xiaoqing Liu
Flexible sensors in practical applications require them to show sufficiently high sensitivity over wide sensing ranges, however, there always exists a trade-off. Herein, we address the aforementioned challenging through the geometric innovation of laser-induced graphene (LIG) conductive paths. A liquid benzoxazine (PGE-fa) precursor is developed to enable the in-situ LIG fabrication on PDMS substrates, eliminating the conventional transfer-induced defects. Furthermore, a dual architecture integrating straight and serpentine LIG patterns in parallel synergistically resolves the sensitivity-range paradox, where the straight segments bear high sensitivity (GF = 68.98 at 1% strain) for micro-strain detection (0.05–10%), while the serpentine components maintain conductivity for large-strain tolerance (up to 30%). It is revealed that the cracks appear in straight LIG line under small deformations, resulting in resistance change to guarantee high sensitivity, whereas the serpentine LIG line can dissipate stress through in-plane bending and rotational deformation, and therefore, contribute to the conductive path to accommodate broad strain range. In addition, the sensor exhibits exceptional performance of rapid response/recovery (180/200 ms), ultralow detection limit (0.05% strain), and 5,000-cycle durability. Experimental validations in pulse waveform analysis, blink detection, joint motion monitoring, and Morse code-based human-machine communication collectively demonstrate the sensor's versatility across diverse physiological and biomechanical sensing scenarios. It is believed that the intelligent structural design in this work is attractive for the development of high-performance wearable systems in personalized healthcare.
研究领域:
材料科学
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纳米技术
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传感器技术
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生物医学工程
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柔性电子学
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人机交互
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 16
·期 5
·7810-7819
·
IF 9.9
Zheng Nan,Liu Jie,Wang Guoqing,Yao Pan,Dang Lihong,Liu Ze,Lu Jiufu,Li Wenge
Polydimethylsiloxane containing methacryloyloxy and methoxy silane groups (MAPDMS)-microcapsule-SiO 2 (MPMS) functional materials were prepared by constructing micro-nano hierarchical structures on the surface of MAPDMS matrix. Herein, MAPDMS@1,1-stilbene-modified hydrolyzed polyglycidyl methacrylate/graphene oxide/dimethyloctadecyl[3-(trimethoxysilyl) propyl]ammonium chloride (MAPDMS@PGMA m /GO/QC18) self-healing microcapsules with compact multi-shell structure were synthesized and combined with nano-SiO 2 to construct the hierarchical structures. Furthermore, ultraviolet (UV)/moisture dual curing mode was introduced into deep curing reaction and efficient self-healing reaction of the MPMS. The results show that the introduction of UV/moisture dual curing mode and micro-nano hierarchical structure gives MPMS functional materials excellent mechanical properties, antifouling properties, self-healing properties, and antibacterial properties. The shear strength and tensile strength of MPMS increase from 3.32 and 4.26 MPa of MAPDMS to 3.81 and 5.06 MPa, respectively. Its static contact angle increases from 115.9° of MAPDMS to 156.5°, and its slide angle decreases from 68.5° of MAPDMS to 7.8°, respectively. The antifouling performance of MPMS against seawater, soy sauce, juice, coffee, protein, and other contaminants is effectively improved compared with MAPDMS matrix. At the same time, the tensile strength and elongation at break of MPMS after healing reach 98.22% and 96.57% of those in original state, respectively. In addition, the antibacterial rates of MPMS against Escherichia coli and Staphylococcus aureus reach 99.85% and 100%, respectively. The MPMS prepared in this paper is expected to be widely used in marine antifouling, pipeline network, anti-icing, microfluidics, wearable devices, medical devices, electrochemical biosensors, and other fields.
研究领域:
材料科学
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化学工程
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生物医学工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Siyu Pang,Zhihao Si,Guozhen Li,Hanzhu Wu,Yuhui Cui,Changwei Zhang,Cong Ren,Shuai Yang,Shusheng Pang,Peiyong Qin
A high-quality mixed matrix membrane (MMM) with high flux and separation factor is fostered to enhance ethanol pervaporation . In this study, a fluorinated and defect-free ZIF-8/PDMS membrane was prepared by the covalent bonding among fluoromonomer, ZIF-8 particles and PDMS using a one-pot method. ZIF-8 is first modified with 3-amino-1,2,4-triazole (Atz) to graft –NH 2 groups, and then modified with glycidyl methacrylate (GMA). This was achieved by the amine-epoxide addition reaction (named GZIF-8) to facilitate covalent bonding with methacrylate-functionalized PDMS, where the interfacial compatibility ZIF-8 and PDMS is improved. Moreover, 1H,1H,2H,2H-perfluorooctyl methacrylate (13F) as F-monomer is introduced into the membrane formation process by the polymerization of methacrylate groups among 13F, ZIF-8 and PDMS, where a fluorinated structure with high hydrophobicity and low surface energy is formed. The pervaporation performance for a 5 wt% ethanol solution at 60 °C shows that the resulting MMM has a high separation factor of 9.5 and total flux of 1681 g m −2 h −1 under the optimized parameters of 3 wt% GZIF-8 loading and 12 wt% 13F amounts.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3535-3551
·
IF 2.1
Wei Liu,Baobao Zeng,Gao Yang
In this study, we adopted the novel strategies of the soot template method to construct SiO 2 ceramic micro-nano structure surface and polydimethylsiloxane (PDMS) modification to reduce the surface energy. We fabricated a superhydrophobic/superoleophilic NS-PDMS oil–water separation screen by depositing coarse nano-SiO 2 ceramic on the surface of 100-mesh stainless-steel screen used as a substrate under the soot template method, which reduced the surface energy with PDMS. The fabricated NS-PDMS screen exhibited excellent superhydrophobic and self-cleaning properties. In particular, the superhydrophobic properties were stably maintained under various harsh conditions. Overall, the screen manifested self-cleaning ability for various water-containing stains, for example, coffee, milk, beer, and soy sauce. The mechanically damaged screen surface still retained its high roughness, and re-modification with PDMS could recover the superhydrophobic surface and oil–water separation performance. This suggests the re-use potential of the damaged NS-PDMS screen, which is vital for cost reduction and resource recycling. We believe that our study makes a significant contribution to the literature, because the fabricated NS-PDMS screen is superhydrophobic, superoleophilic, resistant toward several water-based solutions, chemically and mechanically stable under certain conditions, and can be reused with modification and repair after damage. Therefore, this screen can be broadly used as an oil–water separator.
研究领域:
材料科学
·
化学工程
·
环境科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Houmin Jiang,Youzhang Zhu,Guofeng Zhao,Anwei Tian,Hengrong Li,Jian Li,Shuai Zhao,Guangfa Zhang,Ailin Gao,Jian Cui,Yehai Yan
Electromagnetic interference (EMI) shielding materials with absorption-dominated EMI shielding mechanism can effectively annihilate electromagnetic waves (EMW) and avoid their repeated EMW pollution. However, it is difficult to achieve this goal for conductive polymer-based composites (CPC), because the interface impedance mismatch between air and CPC leads to massive reflection of EMW at the interface. Pores are beneficial to EMW penetrating into the interior of CPC and causing their multiple reflection, scattering and absorption in pores, thus endowing CPC with absorption-dominated EMI shielding characteristic. Herein, highly conductive silvered aramid microfibers (CAMF) were first synthesized via dopamine-assisted electroless deposition of silver coating on aramid microfibers (AMF), and then the conductive porous PDMS composite foams (PDMSF) with absorption-dominated EMI shielding characteristic were prepared and optimized via salt template method. As a result, PDMSF with 1.7 vol% silver content, the conductivity of PDMSF can reach 10 -1 S/m, the EMI shielding efficiency (EMI SE) can reach 36.7 dB in X-band, and the average absorption ratio in EMI SE is 87%, while the density of PDMSF is only 0.28 g/cm 3 . The combination of lightweight, high EMI SE and absorption-dominated EMI shielding characteristic makes the porous PDMSF the latent EMI shielding materials in special constructions (e.g. military, confidential and nuclear facilities, etc.), aerospace, military equipments and transportation, etc.
研究领域:
材料科学
·
电磁学
·
复合材料
·
纳米技术
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Peifeng Zeng,Peng Pan,Jie He,Zhengchun Yang,He Song,Jinxian Zhang
Due to their superior flexibility and stability, flexible pressure sensors are becoming more and more popular for wearable electronics. It is still quite difficult to find high-performance pressure sensors with large detection ranges and great sensitivity. In this paper, an EC/PDMS porous blend with ultraflexible, multilevel porosity and robustness was successfully prepared using ethyl cellulose (EC)-reinforced porous polydimethylsiloxane (PDMS). The porous blends exhibit excellent sensing performance, including an ultrawide linear sensing range (0–251.4 kPa, R2=0.995), high sensitivity (8.94 kPa–1), quick response time, and excellent long-term stability (3500 cycles). It shows good detection capabilities for various deformations in human motion, including compression, deformation, and bending. Furthermore, we assembled the EC/PDMS porous pressure sensor into a portable integrated glove for real-time interaction with mobile devices. Using deep learning algorithms, the glove achieves fast gesture translation and mobile, portable real-time output. It achieves 99.7% accuracy for translating static gestures representing 26 English letters, showcasing its ability to translate daily conversations and complex sentences in real time. Additionally, it can recognize continuous dynamic gestures representing some interesting phrases, demonstrating its great potential as a high-performance wearable pressure sensor for human–computer interaction.
研究领域:
材料科学
·
传感器
·
可穿戴技术
·
人机交互
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Jianying Huang,Ling Xia,Xiaohua Xiao,Gongke Li
A copper/polydimethylsiloxane (Cu/PDMS) microfluidic chip was designed to synthesize SERS substrates through a displacement reaction between silver and copper in microfluidic channels to form a microfluidic SERS nanoparticles (AgNPs)/Cu chip. This SERS substrate fabrication method doesn’t require complex manufacturing processes or expensive equipment, and it can be achieved at room temperature in just 4 min. Meanwhile, the AgNPs grown on copper foil could offer ample hot spots, effectively boosting Raman signals of target molecules, and the enhancement factor (EF) was 5.12 × 107 for methylene blue, 4.08 × 107 for crystal violet, and 4.81 × 105 for sulfadiazine. The chip could be reused at least 9 times with consistent signal performance. Combined with the concentration gradient microchannel network design, we could establish the standard curve for samples through one injection on a single chip. A rapid SERS method for detecting sulfadiazine in aquatic products was developed. The linear range for sulfadiazine analysis was 75.0–1000 μg L−1 with a limit of detection of 28.4 μg L−1. Sulfadiazine was found in aquatic products (43.8 μg kg−1), with recovery rates ranging from 82.7% to 110%. The result was validated using high-performance liquid chromatography, showing a relative error of 9.3%. The entire detection procedure could be completed in just 20 min to detect sulfadiazine. These results demonstrate that the developed SERS method is fast, accurate, and reliable for analysis of sulfadiazine in aquatic products.
研究领域:
分析化学
·
微流控技术
·
光谱学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）