Micromachines
·
2018
·Vol. 9
·期 4
·165
·
IF 2.222
Zong Liu,Siyin Qin,Xingwei Chen,Dazhu Chen,Fei Wang
This paper reports on a chip cooling solution using polydimethylsiloxane (PDMS) based microfluidic devices filled withn-Octadecane. A thick SU-8 layer of 150 µm is used as the master mold for patterning PDMS fabrication. With the SU-8 mold, patterns with straight lines at microscale have been fabricated with standard micro-electro-mechanical system (MEMS) technology. Thermal polymer bonding technique is used to bond the PDMS pattern directly to a flat polydimethylsiloxane (PDMS) film which results in the sealed microchannels.n-Octadecane as a phase-change material has been successfully filled in the microchannels using a dispensing machine. Infrared thermal image shows a sharp contrast of the temperature distribution between the chip withn-Octadecane and the empty chip during the same heating process. This result indicates an efficient cooling performance of the microchannel device with phase-change material. A thermal stimulation test demonstrates that a 16 °C-lower temperature difference can be achieved. This microchannel device, benefited from the flexibility of PDMS substrate, shows specific advantages in meeting the need for the heat dissipation of flexible electronics such as flexible displays, electronic skins, and wearable electronics. Latent heat of the phase-change material can keep the temperature of devices relatively lower over a period of time, which shows potential application values on discontinuously active flexible electronic devices.Keywords:MEMS;polymer;micro-channel device;phase-change material;chip cooling;thermal management;flexible electronics
研究领域:
微纳米技术
·
材料科学
·
热能工程
·
电子工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 10
·1309
·
IF 4.7
Lvchao Qiu,Yutong Zhou,Zhoufeng Zhao,Qi Wang,Lijun Chu,Shipeng Wen
Self-healing polydimethylsiloxane (PDMS) has garnered significant attention due to its potential applications across various fields. In this study, a functionalized modification of PDMS containing di-aminos was initially conducted using 2,6-pyridinedicarbonyl chloride to synthesize pyridine-PDMS (Py-PDMS). Subsequently, rare earth metal europium ions (Eu3+) were incorporated into Py-PDMS. Due to the coordination interaction between Eu3+and organic ligands, a coordination cross-linking network was created within the Py-PDMS matrix, resulting in the fabrication of Eu3+-Py-PDMS elastomer. At a molar ratio of Eu3+to ligands of 1:1, the tensile strength of Eu3+-Py-PDMS reached 1.4 MPa, with a fracture elongation of 824%. Due to the dynamic reversibility of coordination bonds, Eu3+-Py-PDMS with a metal-to-ligand molar ratio of 1:2 exhibited varying self-healing efficiencies at different temperatures. Notably, after 4 h of repair at 60 °C, its self-healing efficiency reached nearly 100%. Furthermore, the gas barrier properties of Eu3+-Py-PDMS with a molar ratio of 1:1 was improved compared with that of Eu3+-Py-PDMS with a molar ratio of 1:1. This study provides an effective strategy for the design and fabrication of PDMS with high mechanical strength, high gas barrier properties, and exceptional self-healing efficiency.
研究领域:
材料科学
·
化学工程
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Shan Peng,Weihua Meng,JunXiang Guo,Bo Wang,Zhenguang Wang,Na Xu,Xiaolin Li,Jian Wang,Jianzhong Xu
In this paper, we present a highly efficient, cost-effective, and widely applicable functionalized SiO2/TiO2-polymer based coating to fabricate a translucent, fluorine-free, chemically stable, photocatalytic active, self-healable superhydrophobic coating, which consisted of two mixed functionalized particles (MFP) and polydimethylsiloxane (PDMS) in a proper ratio. Both SiO2 and TiO2 powders were functionalized with PDMS brushes to achieve superhydrophobicity. To maximally optimize its properties, including superhydrophobicity, transparency, and photocatalytic activity, the ratios between MFP with PDMS were carefully studied and optimized. Glass slides coated with this mixed coating (MC) showed translucence with a transparency of 75%. It also presented superior photocatalytic activity and strong UV resistance that could repeatedly degrade organic oil pollutants as many as 50 times, while still maintaining superhydrophobicity even upon exposure to UV light with a high intensity of 80 mW/cm2 for as long as 36 h. When low-surface-tension oils such as dodecane wetted the MC surface, it showed excellent slippery performance and could quickly repel strong acid/alkali/hot water and even very corrosive liquids such as aqua regia. MC achieved extremely stable underoil superhydrophobicity (toward liquids including water, strong acid and base, hot water, etc.) and self-cleaning properties, not only in oils at room temperature but also in a scalded oil environment. Moreover, MC showed self-healable performance after recycled plasma treatment. The stainless steel mesh coated with MC was also used to highly efficiently separate oil–water mixtures. Moreover, harsher liquids including strong acid/alkali solutions/hot water/ice water–oil mixtures could also be successfully separated by the coated mesh. This coating was believed to largely broaden both indoor and outdoor applications for superhydrophobic surfaces.
研究领域:
材料科学
·
表面工程
·
环境科学
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产品关联
DOI
PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 5
·1640
·
IF 3.4
Zhangling Li,Tong Guan,Wuxu Zhang,Jinyun Liu,Ziyin Xiang,Zhiyi Gao,Jing He,Jun Ding,Baoru Bian,Xiaohui Yi,Yuanzhao Wu,Yiwei Liu,Jie Shang,Runwei Li
Elastic pressure sensors play a crucial role in the digital economy, such as in health care systems and human–machine interfacing. However, the low sensitivity of these sensors restricts their further development and wider application prospects. This issue can be resolved by introducing microstructures in flexible pressure-sensitive materials as a common method to improve their sensitivity. However, complex processes limit such strategies. Herein, a cost-effective and simple process was developed for manufacturing surface microstructures of flexible pressure-sensitive films. The strategy involved the combination of MXene–single-walled carbon nanotubes (SWCNT) with mass-produced Polydimethylsiloxane (PDMS) microspheres to form advanced microstructures. Next, the conductive silica gel films with pitted microstructures were obtained through a 3D-printed mold as flexible electrodes, and assembled into flexible resistive pressure sensors. The sensor exhibited a sensitivity reaching 2.6 kPa−1with a short response time of 56 ms and a detection limit of 5.1 Pa. The sensor also displayed good cyclic stability and time stability, offering promising features for human health monitoring applications.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Microfluidics and Nanofluidics
·
2015
·Vol. 19
·期 4
·829-836
·
IF 2.528
He Weiqi,Xiao Jingrong,Zhang Zhengtao,Zhang Weiying,Cao Yiping,He Rongxiang,Chen Yong
A cost-effective method that used electroplating to fabricate a 3D polydimethylsiloxane (PDMS) passive micromixer was developed in this work. The mixer fabrication process characteristics were as follows: The chip design was transferred to indium tin oxide (ITO) glass via photolithography; the ITO glass was vertically immersed in a nickel electroplating solution; and the ITO glass was raised up by controlling by the syringe pump, while electroplating was in progress. In this method, the height of the mixing structure could increase gradient from 15 to 30 μm. Compared with a flat structure, this structure could increase mixing efficiency by at least 10 %. The mixing efficiency with this 3D microstructure can reach more than 80 %. This 3D microstructure fabrication method can be easily integrated with other PDMS functional structures for future point-of-care diagnostic applications because of the advantages of this technique.
研究领域:
微流控技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Peng Li,Tianyu Shi,Xiaodong Li,Jiakai Cao,Lei Yang,Zhanggui Hu,Gang He
Aluminum nitride (AlN) has emerged as a promising filler for the fabrication of highly thermally conductive polymer composites due to its intrinsic high thermal conductivity and electrical insulation. Herein, the effects of oxygen content in combustion synthesized AlN and subsequent surface modification on the thermal and electrical properties of polydimethylsiloxane (PDMS) based composites were investigated. It is demonstrated that the thermal conductivity of the composite is enhanced with decreasing oxygen content in the AlN filler. Further functionalization with 3-aminopropyltriethoxysilane (APTES) yields a notable improvement in thermal transport, reaching 1.76 Wm −1 K −1 . Moreover, employing a binary hybrid filler system comprising Al 2 O 3 and AlN enables a substantial synergistic enhancement, elevating the thermal conductivity up to 4.2 Wm −1 K −1 .
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2025
·
IF 5.6
Yunqing Ye,Haoyang Huang,Hong Li,Gang Wu
As a crucial mechanobiological regulator, the tension of the cell membrane plays a vital role in governing cellular adhesion, proliferation, and differentiation processes. Additionally, it displayed a dynamic response to mechanical microenvironmental changes. This research systematically examines the mechanoresponsive behaviors of mouse bone marrow mesenchymal stem cells (mBMSCs) that are cultured on poly(dimethylsiloxane) (PDMS) substrates which are functionalized with methyl (-CH 3 ), amino (-NH 2 ), and carboxyl (-COOH) groups. Under both static and stretching conditions, it is found that compared with the -CH 3 surface, static culture on the -NH 2 and -COOH functionalized surfaces significantly promotes the proliferation of mBMSCs and upregulates the expression of extracellular matrix adhesion-related genes, especially focal adhesion kinase (FAK) and integrin β1. Morphometric analysis reveals that there are concomitant increases in the cell spreading area and the number of pseudopods on these modified surfaces. Mechanical stretching stimulation not only amplifies these cellular responses but also leads to more uniform FAK distribution. The assessment by atomic force microscopy (AFM) shows that both chemical functionalization (-NH 2 /-COOH) and stretch stimulation reduce the deformability of the cell membrane, and the -NH 2 modification exhibits a greater membrane-stiffening effect than -COOH.
研究领域:
细胞生物学
·
生物力学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wang Guo,Zhiqiang Ma,Zhou Chen,Haojun Hua,Dong Wang,Mohamed Elhousseini Hilal,Yatian Fu,Pengyi Lu,Jian Lu,Yuanting Zhang,Derek Ho,Bee Luan Khoo
Increasing demand for flexible sensors in healthcare has spurred the development of nanomaterial-polymer composite sensors. However, existing pressure sensors suffer from low sensitivity due to poor interactions between the functional filler and the polymer matrix. For example, the direct chemical bonding of nanomaterials to the surface of chemically inert polymers such as polydimethylsiloxane (PDMS) is not easily achieved. Herein, we demonstrate that MXene can significantly promote the sensitivity of a thin and soft piezoresistive sensor based on a surface functionalized PDMS (FPDMS) sponge. Using plasma treatment, we constructed a MXene-FPDMS (MFP) sponge with high mechanical strength via the interlayer hydrogen bonding effect. The formed MFP sponge structure (∼450 μm in thickness) endows the pressure sensor with a high sensitivity of 14.2 kPa −1 and a low modulus of 9.7 kPa, critical for detecting ultra-low pressures. When operated with deep learning algorithms, the MFP sponge sensor successfully classifies the pronunciation of 26 letters and various polite expressions with an average accuracy of 94 ± 0.6 %. We envision that this work paves the way for the development of intelligent wearable platforms.
研究领域:
材料科学
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电子工程
·
人工智能
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产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 34
·17812-17820
·
IF 6.895
Longxiang Han,Hengchang Bi,Xiao Xie,Shi Su,Peng Mao,Litao Sun
Materials for emulsion separation with low pressure, high flux and high stability are of great interest in the treatment of oily wastewater. Herein, we report a facile strategy for the fabrication of PDMS and graphene coated melamine sponge (PG-MS), which can efficiently separate oil-in-water emulsions. In PG-MS, melamine sponge (MS) provides a three-dimensional porous structure, graphene constructs hydrophobic microcavities, and PDMS enhances the hydrophobic property of the material, forming a superhydrophobic material. The PG-MS shows high flux (experimentally 10 000 L m−2 h−1, and the effective flux increases with the thickness of the filter layer), high separation efficiency (oil content of the filtered water ∼4.7 mg L−1 can be discharged directly, with oil separation efficiency >99%), low pressure (applied to overcome water's gravity), and high stability (no obvious change in 20 cycles). Our study indicates that PG-MS has a wide range of applications in oil-in-water emulsion separation in industry and environmental sciences.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yi-Min Zhu,Jie Tang,Xin Jin,Ting-Rui Pan,Yu Chang,Zhen-Guo Yang
To solve the problems of a conventional subtractive process for preparing conductive circuits, numerous alternative additive processes have been investigated, such as screen or inkjet printing, selective electroless plating, laser-induced forward transfer, etc. They all lead to a simpler procedure, less pollution, and finer line width but are still faced with difficulties like low conductivity and thickness, poor adhesion, and high cost. PDMS is a kind of material with low surface energy, leading to low adhesion with adhesive. Under these circumstances, a simple template transfer process for additively preparing conductive circuits is reported. The process to form the template includes the preparation of a photolithographic mask on the carrier copper foil and adsorption of PDMS anti-adhesion coating. Followed by metal deposition through electroplating on the template, the conductive circuits are transferred to the target substrate. Thus, the designed conductive circuits on various substrates including paper and cloth are formed. The template can be used again after being reimmersed into PDMS anti-adhesion coating. The components and the concentration of the coating are carefully discussed, and the mechanism of anti-adhesion is also researched by EIS and XPS. The copper circuits show a line width of 10 μm, a peeling strength of 7.11 N/cm, and a resistivity of 1.93 μΩ·cm, which is similar to that of bulk copper. With low pollution and cost, high versatility, and good electrical and adhesion performance, the template transfer process shows a good application prospect in the large-scale production of flexible electronics like sensors, RFID tags, etc.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Xiwen Liu,Qingkun Hu,Yuanjun Tong,Nan Li,Sai Ouyang,Huangsheng Yang,Jianqiao Xu,Gangfeng Ouyang
Solid-phase extraction (SPE) is a popular technique for environmental sample pretreatment . However, SPE usually requires complex sample pretreatment processes, which is time-consuming and inconvenient for real-time and on-site monitoring. Herein, a solvent-free, rapid, and user-friendly SPE device was developed by coating the polydimethylsiloxane (PDMS)/divinylbenzene (DVB) sorbent on the inner wall of a sample bottle. The extraction process and desorption process were both carried out in the bottle. The analytes trapped in the sorbent were thermally desorbed and simultaneously sucked out from the bottle by an air sampling tube equipped on field-portable GC-MS. Different to previous work, the sample pretreatment process didn’t require any complicated and time-consuming steps, such as centrifugation or filtration. The total analysis time for each sample was less than 25 min, which was feasible for rapid on-site detection, and thus avoided the losses and contamination of samples in conventional sample storage and transportation processes. Under optimal conditions, the proposed SPE method exhibited wide linear ranges, low detection limits (0.010–0.036 μg L −1 , which were much lower than the maximum levels restricted by the US Environmental Protection Agency and the Chinese GB3838-2002 standard), good intra-bottle repeatability (6.13–7.17%, n = 3) and satisfactory inter-bottle reproducibility (4.73–6.47%, n = 3). Finally, the method was successfully applied to the rapid detection of BTEX in the field. The recoveries of BTEX in spiked water samples ranged from 89.1% to 116.2%. This work presents a novel SPE approach for rapid on-site monitoring in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Nano Energy
·
2021
·
IF 17.881
Nannan Wang,Yange Feng,Youbin Zheng,Feng Zhou,Daoai Wang
The tribocharges generated by the friction of the polymer material are temporarily stored on the interface, which allows the triboelectric nanogenerators (TENGs) to generate electrical output or produce electrostatic discharge on the polymer surface . Therefore, tribocharge regulation on the material surface is of considerable significance to improve the electrical output of TENGs or design new anti-static materials. A new method with universal applicability to control the triboelectrification of interface by photothermal materials is proposed in this study. In this method, the near-infrared (NIR) irradiation will cause the thermo electron emission of Fe 3 O 4 , thereby changing the charge amount on the PDMS surface. Results show that the surface potential of Fe 3 O 4 @PDMS is reduced by 76.8% after NIR excitation when the PDMS surface is positively charged. In addition, the surface potential increases by 42.9% when the surface of Fe 3 O 4 is negatively charged, showing the opposite trend. Moreover, the friction coefficient of the polymer can be adjusted by modifying the surface triboelectricity to change its motion state. This strategy has many interesting applications, such as reducing the friction resistance of skis by reducing the surface charges or increasing the friction resistance by raising the charges on the surface of a car tire, thereby reducing the gliding distance during emergency braking.
研究领域:
材料科学
·
纳米技术
·
物理学
✓ 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）