查找使用阿拉丁产品的科研文献

Flexible and reusable nanobowl-based Ag NPs@Ag-PDMS substrate for enhanced SERS detection

Yue Feng,Jin Xia,Huiliang Zhang,Longhao Han,Xiaoyan Du,Jinyang Wang,Mingyao Tian

Surface-enhanced Raman scattering (SERS) has gained widespread attention as an effective method for trace molecular detection. Herein, a bowl-structured Ag NPs@Ag-PDMS substrate was developed via a multi-step assembly strategy, where silver nanoparticles (Ag NPs) were partially embedded into the bowl-structured surface of a polydimethylsiloxane (PDMS) matrix while additional Ag NPs were incorporated into the interior. This synergistic architecture significantly amplified the local electromagnetic field, as confirmed by experiments and finite element simulations. Using rhodamine 6G (R6G) as a probe and a fiber Raman spectrometer, the optimized substrate enabled detection at 5 nM with an enhancement factor of 1.22 × 10 6 . The substrate also exhibited good signal uniformity with a relative standard deviation of 6.99 % and maintained performance after five rinsing–reuse cycles. Furthermore, it successfully detected thiram residues on apple peels, showing a linear response down to 3 ng/cm 2 . These findings highlight the high sensitivity, reproducibility, and reusability of the substrate, indicating strong potential for real-world SERS applications in food inspection, environmental analysis, and public health screening.

Efficient oil recovery from emulsions through PDMS decorated nanofibrous membranes via aggregation-release demulsification

Yue Zhu,Yajie Ding,Jianqiang Wang,Haibo Lin,Fu Liu,Chuyang Y. Tang

Efficient oil/water recovery from emulsions is a challenging task for membrane separation in terms of perm-selectivity and long-term stability. Oil fouling on membrane surface and intrapore disables the efficient recovery of water and oil, limited by size exclusion. Herein, this work proposes an aggregation-release demulsification mechanism to address the fouling issue and achieve efficient oil and water recovery, respectively. Specifically, an ultra-thin sub-10 nm polydimethylsiloxane (PDMS) shell layer was constructed on a hydrophilic polyacrylonitrile (PAN) nanofiber core surface through the hydrolysis and condensation between vinyltriethoxysilane (VTES) and dimethoxydimethylsilane (DMS). The aggregation-release demulsification process on the lipophilic and slippery PDMS surface could be proposed as, oil droplet adsorption, spread out, aggregation and slippery, which vacates the membrane pore space and makes way for water flow. Thus, both purified water and aggregated oil phase could be easily recovered from the permeates. The prepared membrane enabled continuous operation without cleaning. The membrane shows high water permeance (2800 L m -2 h −1 bar −1 ), high emulsion treatment capacity (8000 mL), and high oil (∼85 %) and water (nearly 100 %) recovery. The strategy reported in the current study might offer an opportunity for advancing practical applications of membrane separation for valuable oil products from emulsions.

A pump-free paper/PDMS hybrid microfluidic chip for bacteria enrichment and fast detection

Zhengshan Zhu,Zilan Lv,Li Wang,Haolan Tan,Yi Xu,Shunbo Li,Li Chen

Developing portable and sensitive biosensors for bacteria detection is highly demanded due to their association with environmental and food safety. Paper-based microfluidic chip is the suitable candidate for constructing pump-free biosensor since paper is hydrophilic, low-cost and easy to use. However, the contradiction between sensitivity and small sample volume seriously affects the application of paper-based chip for bacteria detection. Here, a new microfluidic biosensor, combining large PDMS reservoir for sample storage, hydrophilic paper substrate for pump-free water transport, coated microspheres for bacteria capture and super absorbent resin for water absorption, is designed for the detection of bacteria in aqueous samples. Once the sample solution is introduced in the reservoir, water will automatically flow through the gaps between microspheres and the target bacteria will be captured by the aptamer coated on the surface. To facilitate PDMS reservoir bonding and ensure water transport, the upper side of paper substrate is coated with Polyethylenimine modified PDMS and the bottom side is kept unchanged. After all the solution is filtrated, fluorescent dye strained bacteria are enriched on the microspheres. The fluorescent intensity representing the number of bacteria captured is then measured using a portable instrument. Through the designed microfluidic biosensor, the bacteria detection can be achieved with 2 mL sample solution in less than 15 min for water or 20 min for diluted milk. A linear range from 10 CFU/mL to 1000 CFU/mL is obtained. The paper-based 3D biosensor has the merits of low-cost, simple operation, pump-free and high sensitivity and it can be applied to the simultaneous detection of multiple bacteria via integrating different aptamers.

Sandpaper-Induced Wrinkled PDMS/Nanosilica Membrane for Assembling AgNWs and PEDOT:PSS Stretchable Transparent Electrodes

Longqi Zhao,Mingxiang Xu,Xinwen Hong,Jiahua Chen,Chenhu Mei,Xuejing Li,Xiaoyan Li

Developing stretchable transparent electrodes that simultaneously achieve high conductivity, optical transparency, mechanical stretchability, and environmental stability remains a significant challenge. In this study, a fluorosilane-modified sandpaper template was employed to create a nanosilica-enhanced PDMS composite membrane with a wrinkled surface structure, which enhances the mechanical properties and facilitates the ordered assembly of the conductive materials. The high modulus of the nanosilica preserved the micronano structural integrity after demolding without sacrificing membrane flexibility, while the textured surface and relatively hydrophilic nature enable straightforward surface modification. Through spin-coating and thermal treatment, silver nanowires (AgNWs) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) were sequentially deposited onto the structured membrane, yielding a dense, well-adhered conductive network. The resulting flexible composite electrode retained optical transparency while exhibiting excellent electrical conductivity, enhanced stretchability, and outstanding environmental stability, underscoring its potential for wearable thermal management and strain sensing applications.

Marine biomass-derived PDMS-based composite sponge for sustainably sourced solar-driven interfacial evaporation

Penglin Lu,Shangru Cheng,Shanshan Guan

Solar-driven interface evaporation has emerged as an attractive technology for addressing the pressing issue of water scarcity. Herein, from the perspective of utilizing and managing ocean resources, we have developed a comprehensive evaporator based on ocean biomass for efficient solar-driven interfacial evaporation, aiming to sustainably harness marine resources. The construction of a biomass-based evaporator was achieved using three-dimensional melanin nanoparticles (MNPs)@carboxymethyl chitosan (CMCS)/polydimethylsiloxane (PDMS) porous sponge, which exhibits highly hydrophilic and porous properties. In this study, MNPs functioned as the photothermal material and the CMCS-hydrophilic modified PDMS sponge was utilized as the supportive material. Owing to its outstanding photothermal conversion capability and ingeniously designed columnar shape with cold evaporation surface, the MCP sponge-based evaporator achieves a water evaporation rate of 2.04 kg·m −2 ·h −1 and an evaporation efficiency of 85% under 1sun illumination. In addition, the MCP sponge-based evaporator exhibits an outstanding desalination performance (93% salt rejection) and purification efficiency for dyes with natural sunlight. This groundbreaking study presents an innovative method by utilizing marine biomass-derived CMCS and MNPs as raw materials to construct a high-performance solar-driven interface evaporator, thereby tackling clean water generation and promoting the sustainability of marine ecosystems.

Liquid-like PDMS brush/TiO₂ interface for photocatalytic self-renewal in persistent emulsion separation

Rongxue Xi,Chenshun Hu,Shouzheng Jiao,Yuwei Hao,Zhicheng Sun,Zhongjun Cheng

Efficient treatment of water-in-oil emulsions remains challenging, primarily due to surfactant-induced droplet stabilization and rapid membrane fouling that causes pore blockage and flux decay. In this study, we develop a light-responsive liquid-like separation surface by grafting linear polydimethylsiloxane (PDMS) chains onto TiO₂-modified stainless steel mesh. The grafted PDMS brush forms a mobile, low-adhesion interface that promotes droplet detachment and suppresses organic deposition, while the TiO₂ nanoparticles generate reactive oxidative species under UV irradiation to degrade residual contaminants. This dual-action design enables continuous gravity-driven separation of immiscible oil/water mixtures and surfactant-stabilized emulsions. The membrane maintains superoleophilicity in air and strong water repellency in oil, ensuring selective transport of the oil phase. Critically, UV illumination rapidly restores flux after fouling, and the separation efficiency remains above 85 % over repeated cycles. The synergistic integration of dynamic PDMS brush and photocatalytic self-cleaning presents a simple and scalable route for developing durable antifouling interfaces for long-term emulsion purification and potentially broader waste-oil treatment applications.

Simple fabrication of a scalable, self-cleaning metakaolin-PDMS film for daytime radiative cooling

Ruizhen Xu,Long Wang,Xiongbo Yang,Wendi Fan,Huiling Xiong,Liyu Fang,Ji Cheng,Yuqi Sun,Weiwei Hu,Yulong Qiao,Guiguang Qi,Xinyu Tan

Passive daytime radiative cooling (PDRC) is a green, highly efficient, and energy-free technology, yet several challenges exist in its practical commercial implementation. In this work, a facile preparation method was employed to modify metakaolin (MK) into hydrophobic metakaolin (MMK). Using MMK as filler and polydimethylsiloxane (PDMS) as binder, a radiative cooling film (PDMS@MMK) with superhydrophobic properties was fabricated. Via this simple blending approach, a high solar reflectance of 90.2% and outstanding broadband long-wave infrared emissivity of 95.5% were achieved. Compared to an aluminum plate, this film produced an average temperature difference of 14.2°C on the surface of objects. When applied to model houses, model cars, or mobile phone cases, the film effectively lowered the temperature of these objects by 9–12°C under solar irradiation. Additionally, the film exhibited a surface contact angle of 151.5°, demonstrating excellent self-cleaning performance, along with feasibility for large-scale production. This study offers new insights into advancing PDRC technology toward multifunctional applications.

Highly stable PDMS–PTFPMS/PVDF OSN membranes for hexane recovery during vegetable oil production

Xiang Li,Binglun Chen,Weibin Cai,Tao Wang,Zhen Wu,Jiding Li

There is a lack of stable and hydrophobic organic solvent nanofiltration (OSN) membranes meaning that their implementation in non-polar solvent nanofiltration remains a challenge, typically in solvent (e.g. hexane) recovery during vegetable oil production (e.g. soybean oil/hexane). Considering this, novel trifluoropropylmethylsiloxane dimethylsiloxane (PDMS–PTFPMS)/polyvinylidene fluoride (PVDF) membranes, with both high hexane permeability of PDMS and excellent hexane stability of PTFPMS, were successfully developed to recover hexane via OSN. Their microstructure and surface properties were characterized by SEM, FTIR, DSC, TGA, XPS and contact angle measurements. We explored the effects of the ratio of the PTFPMS segment in polymer chain and polymer viscosity on membrane performance. With regards to the F50-M membrane, we also conducted a comprehensive study on the OSN performance of the F50-M membrane under different operational conditions. The oil rejection was above 95% with stable hexane permeability of 3.06 kg−1 μm m−2 h−1 bar−1 over a 32-day period. Experimental results confirmed its ability to recover hexane under various operational conditions, showing high oil rejection and excellent long-term operational stability. We attributed its outstanding performance to its unique microstructure and surface properties due to the fluorine-containing PTFPMS segment. This study indicates that fluoropolymer membranes are promising candidates in OSN processes, offering a wider choice of membrane materials and application fields.

Fabrication and characterization of superhydrophobic PDMS composite membranes for efficient ethanol recovery via pervaporation

Xinping He,Tao Wang,Jinghui Huang,Jinxun Chen,Jiding Li

Bio-ethanol, clean and renewable, has proved to be a promising alternative energy resource to replace conventional fossil fuels. In its continuous production via the fermentation–pervaporation process, hydrophobic polymer membranes such as polydimethylsiloxane (PDMS) have been developed to enrich ethanol from dilute fermentation broth. However, the efficiency of current ethanol recovery via pervaporation is not high enough for large-scale bioethanol production. To address this issue, we separately fabricated two types of lotus-inspired PDMS composite membranes to combine the beneficial properties (low surface energy and super-hydrophobicity) of superhydrophobic lotus leaves with the pervaporation process and optimized the separation performance. First, we prepared lotus leaf powder/PDMS mixed matrix membranes (MMMs) to exploit the intrinsic properties of lotus leaf’s material. In addition, polydivinylbenzene (PDVB)-coated PDMS composite membranes were fabricated to mimic and make use of the properties coming from the lotus leaf’s hierarchical structure. The morphology, surface chemistry, and pervaporation performance were systematically investigated for all the membranes. And results showed that MMMs at 1.5 wt% lotus powder loading displayed the ideal dispersion condition and increased the total flux of pervaporation process by 22% (750 g∙m −2 ∙h −1 , 6 wt%, 37 °C). For the PDVB-coated PDMS membrane, the hierarchical roughness was successfully established on the PDMS surface, which resulted in a super-hydrophobic surface with water contact angle higher than 150°. As PDVB also has preferential adsorption for ethanol, the PDVB-coated PDMS membrane showed a higher ethanol recovery performance with the separation factor and total flux increased by 13% and 30%, respectively. Therefore, it was demonstrated that PDVB coating is an effective method to fabricate superhydrophobic membranes and both the two lotus-inspired strategies are feasible in optimizing pervaporation performance for ethanol recovery.

Water-durability and high-performance all-fiber humidity sensor using methyldiethanolamine-photopolymer-PDMS structure

Jinjian Yu,Jinjian Yu,Piliang Liu,Piliang Liu,Yaxun Zhang,Yaxun Zhang,Qianran Sun,Qianran Sun,Yu Zhang,Zhihai Liu,Libo Yuan,Xiaoyun Tang,Xiaoyun Tang,Xiaoyun Tang

In the context of optical fiber humidity sensing, the long-term stability of sensors in high humidity and dew environments such as bathrooms or marine climates remains a challenge, especially since many humidity sensitive materials are water soluble. In this study, we use methyldiethanolamine, pentaerythritol triacrylate and Eosin Y to form a liquid-solid structure humidity sensitive component, the outermost layer is coated with PDMS passivating layer to ensure the stability and durability of the humidity sensor under the conditions of dew and high humidity. The liquid microcavity of the sensor consists of methyldiethanolamine-pentaerythritol triacrylate composite solution, and the sensitivity is several times higher than that of the liquid-free cavity sensor. The sensitivity of the sensor to temperature is verified (0.43 nm/°C and 0.30 nm/°C, respectively) and temperature crosstalk is compensated using a matrix. The compact structure allows for ultra-fast response (602 ms) and recovery time (349 ms). Our work provides a promising platform for efficient and practical humidity and other gas monitoring systems.

The Effectof Film Microtexture and Magnetic Field on Transparency of Fe3O4-PDMS Nanocomposite Films

Qiushu Zhang,Bei Peng,Di Li,Yang Yang,Yaling Liu

Large-Area and High-Throughput PDMS Microfluidic Chip Fabrication Assisted by Vacuum Airbag Laminator

Shuting Xie,Jun Wu,Biao Tang,Guofu Zhou,Mingliang Jin,Lingling Shui

One of the key fabrication steps of large-area microfluidic devices is the flexible-to-hard sheet alignment and pre-bonding. In this work, the vacuum airbag laminator (VAL) which is commonly used for liquid crystal display (LCD) production has been applied for large-area microfluidic device fabrication. A straightforward, efficient, and low-cost method has been achieved for 400 × 500 mm2microfluidic device fabrication. VAL provides the advantages of precise alignment and lamination without bubbles. Thermal treatment has been applied to achieve strong PDMS–glass and PDMS–PDMS bonding with maximum breakup pressure of 739 kPa, which is comparable to interference-assisted thermal bonding method. The fabricated 152 × 152 mm2microfluidic chip has been successfully applied for droplet generation and splitting.Keywords:large-area;microfluidic devices;fabrication;vacuum airbag laminator