WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 4
·873-886
·
IF 2.5
Tao Haiyan,Cao Xiaochang,Song Rujie,Zhou Zebin,Cheng Fang
A membrane-aerated biofilm reactor (MABR) combines membrane technology with biofilm processes and has unique advantages in the treatment of organic wastewater and volatile wastewater. The common membranes for MABR systems usually have relatively uneven pore structures and low bubble point pressure, resulting in unsatisfactory O 2 utilization and wastewater treatment efficiency. In this work, polydimethylsiloxane (PDMS) and UiO-66 (a Zr-based metal organic framework) were coated on the surface of a commercial polypropylene (PP) hollow fiber membrane to prepare oxygen-rich MABR membranes and modules, which showed an attractive O 2 utilization rate and wastewater treatment efficiency. The bubble points of the PDMS and PDMS-UiO-66 membranes were significantly higher than those of the PP membranes, and the PDMS-UiO-66 membranes had better oxygen enrichment capacity and biological affinity. The optimal PDMS-UiO-66 membrane modules had an O 2 permeance of 31.65 GPU (1 GPU = 3.35 × 10 −10 mol m −2 s −1 Pa −1 ), with O 2 /N 2 selectivity of 2.21. The membrane hanging effect and processing capacity for domestic sewage were greatly improved. This study may provide insights and guidelines to fabricate porous mixed matrix membranes and modules in the industry for MABR. The developed products are expected to be applied in the actual separation process. PDMS and PDMS-UiO-66 were coated on the PP support to prepare O 2 -rich MABR membranes and modules. With UiO-66 loading, the module has a higher O 2 /N 2 separation performance, a rougher and more hydrophilic membrane surface. The PDMS-UiO-66 membrane module exhibits a good biofilm hanging effect and high NH 4 + -N removal performance.
研究领域:
环境科学
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yufeng Lei,Yaling Lin,Anqiang Zhang
Zwitterionic polymers have been used to cope with nonspecific protein adsorption and bio-fouling problems for a wide range of materials, including biomedical devices, marine coatings and membrane separation. However, direct surface modification with highly water-soluble zwitterionic polymers is rather difficult due to their poor attachment to hydrophobic solid surfaces. In this work, we utilize the hydrophobic interaction to anchor zwitterionic polysiloxanes grafted with cysteine onto surfaces by adding an hydrophobic block of polydimethylsiloxanes, referred as PDMS- b -(PDMS- g -Cys)s. The synthesis involves only three steps of reactions, and the structures of each product were characterized using GPC, FT-IR and 1 H NMR. The adsorption and protein resistance of PDMS- b -(PDMS- g -Cys)s on a gold surface are investigated with QCM-D. The results show that the hydrophobic interaction moieties of the additional PDMS blocks help the hydrophilic cysteine-grafted blocks stably attach and then function on the sensor. These findings suggest that the addition of hydrophobic moieties provides an effective approach to construct anti-fouling interfaces with zwitterionic polymers in aqueous solution.
研究领域:
材料科学
·
生物医学工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xueheng Yang,Junguang Li,Bingyan Jiang,Mingyong Zhou
Integrating membranes into microfluidic chips expands applications in many fields. A key challenge in fabrication of membrane-integrated microfluidic chips is the effective bonding of membrane and the substrate. Herein, the surface of polycarbonate track-etched membrane was modified by oxygen plasma treatment to enhance the bonding strength. Contact angle measurements confirmed the wettability of the membrane surfaces was significantly improved by plasma treatment. X-ray photoelectron spectroscopy and scanning electron microscopy analyses revealed increased oxygen incorporation onto the surface of the membranes and a linear increase in the membrane's pore size with treatment time. Two models of modification were proposed in molecular dynamics simulations to study the wetting mechanism of plasma-treat membrane at a micro scale. Burst pressure test and particle separation experiment were conducted to study the optimal parameters for plasma treatment and validate the performance of microfluidic chip. Oxygen plasma treatment effectively enhances the hydrophilicity of the membrane, generates robust intermolecular interactions and strengthens its bonding strength with the substrate.
研究领域:
材料科学
·
生物医学工程
·
微流控技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 13
·期 1
·242-249
·
IF 5.7
Lidong Wang,Xueting Fu,Peng Du,Hai Jiang,Laihui Luo
The versatility of emission modes and colors in flexible films is essential for broadening their potential applications. This study presents the development of a multi-mode luminescent flexible film by integrating ZnS:Cu and LiNbO3:Pr3+ powders into a polydimethylsiloxane (PDMS) matrix. The ZnS:Cu and LiNbO3:Pr3+ powders are uniformly distributed in the PDMS matrix. The effect of the LiNbO3:Pr3+ content on the photoluminescence (PL), electroluminescence (EL), mechanoluminescence (ML), thermoluminescence (TL), and photostimulated luminescence (PSL) properties of the films has been investigated. The PL colors of the LiNbO3:Pr3+/ZnS:Cu/PDMS flexible films due to the distinct intrinsic emissions of ZnS:Cu and LiNbO3:Pr3+ can be changed by altering the excitation wavelength. An appropriate content of the LiNbO3:Pr3+ powder introduces PSL into the flexible films, while the films demonstrate excellent EL and ML performance, along with multicolored TL emissions, including red and green. This research offers a novel approach to enhancing flexible electronic displays, EL devices, and optical anti-counterfeiting technologies.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
LAB ON A CHIP
·
2016
·Vol. 17
·期 1
·120-127
·
IF 5.586
Jin-Wen Shangguan,Yu Liu,Jian-Bin Pan,Bi-Yi Xu,Jing-Juan Xu,Hong-Yuan Chen
In this paper, we propose a generalized concept of microfluidic polydimethylsiloxane (PDMS) on paper (POP) devices, which combines well the merits of paper chips and PDMS chips. First, we optimized the conditions for accurate PDMS spatial patterning on paper, based on screen printing and a high temperature enabled superfast curing technique, which enables PDMS patterning to an accuracy of tens of microns in less than ten seconds. This, in turn, makes it available for seamless, reversible and reliable integration of the resulting paper layer with other PDMS channel structures. The integrated POP devices allow for both porous paper and smooth channels to be spatially defined on the devices, greatly extending the flexibility for designers to be able to construct powerful functional structures. To demonstrate the versatility of this design, a prototype POP device for the colorimetric analysis of liver function markers, serum protein, alkaline phosphatase (ALP) and aspartate aminotransferase (AST), was constructed. On this POP device, quantitative sample loading, mixing and multiplex analysis have all been realized.
研究领域:
微流控技术
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED OPTICS
·
2022
·Vol. 61
·期 15
·4558-4566
·
IF 1.905
Jian Jin,Jian Jin,Zhong Wang,Jun Wu,ZhenHua Yu,XiaoBao Cao,XiaoBao Cao,XuDi Wang,XuDi Wang
Polydimethylsiloxane (PDMS) and polyurethane acrylate (PUA) are excellent pattern transfer materials. In this study, PDMS-PUA bi-directional replication technology is explored using the PDMS grating as a template, and relevant technical issues are discussed in detail. Special surface treatment and process optimization are applied to solve the problems of demolding, PDMS polymerization inhibition, and substrate flatness. Further experiments show that the technology can be employed to replicate nanoscale structures and has the potential value of prolonging the longevity of the original template. Additionally, utilizing the advantage of the high elasticity of PDMS materials, two applications of bi-directional replication technology are demonstrated. One is to increase the line-density of the grating by stretching, and the experimental results show that the line-density of the grating increased by 26.6%. The other one is to fabricate the convex grating. Compared with the original planar PDMS grating, the resolution of the first-order diffraction spectrum of the convex grating at the focal point has been greatly improved. Since this technology requires simple equipment, and PDMS and PUA are reusable, it has the advantages of low cost, simplicity, and rapid fabrication. The two application examples also indicate that the technology has good application value.
研究领域:
材料科学
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纳米技术
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光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL FIBER TECHNOLOGY
·
2025
·
IF 2.7
Zhoujie Li,Ting Liu,Xuezhi Huang,Qing Yu,Yin Wang,Fang Cheng,Tegoeh Tjahjowidodo
Optical fiber pressure sensors have become indispensable in various fields due to their unique advantages. Traditional sensors based on fiber Bragg gratings or Fabry-Pérot resonators offer high sensitivity and the ability to perform distributed measurements. However, these sensors often suffer from complex manufacturing processes and high costs. To address these challenges, we propose an innovative approach utilizing a polydimethylsiloxane (PDMS)-based liquid-core optical fiber probe for pressure sensing. The fiber probe is prepared by sealing a fluorescent dye solution within the PDMS-based hollow-core fiber and then inserting the end face of a silica optical fiber into it, which only relies on extremely simple fabrication operations and cost-effective materials. When integrated with an excitation laser and a fiber spectrometer, the sensor enables calibration and quantitative detection of pressure based on the correlation between pressure and the fluorescence intensity. The experimental results show that the sensor exhibits a high sensitivity of 400.508 a.u./N and a high resolution of 0.093 N, along with high detection accuracy, good repeatability and stability, rapid dynamic response, and excellent long-term stability within the 0–30 N load range. Moreover, it is capable of effectively monitoring various human activities, such as finger tapping and palm pressure, which are crucial for applications in medical monitoring, wearable devices, human activity monitoring, and smart products.
研究领域:
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Bei Jiang,Meilin Li,Shuoang Cao,Zining Wang,Lijun Huang,Xinyi Song,Yuanqiao Zhang,Quanping Yuan
In order to increase the number and contact probability of electric dipole on cellulose, acid and alkali treatment was employed to extract hemicellulose and lignin from original wood to gain a highly oriented cellulose frame. The combined means with 2,2,6,6-tetramethylpiperidine-1-oxyl–NaBr–NaClO oxidation and impregnation of PDMS with compression was subsequently used to enhance its mechanical performance and electromechanical conversion. The assembled wooden electromechanical device (10 mm × 10 mm × 1 mm) exhibits the maximum open-circuit voltage (VOC) of 11.75 V and short-circuit current (ISC) of 211.01 nA as stepped by foot. It can be sliced to fabricate a flexible sensor with high sensitivity displaying VOC of 2.88 V and ISC of 210.09 nA under the tapped state. Its highly oriented wood fiber makes it display significant anisotropy in terms of mechanical and electromechanical performance for multidirectional sense. This strategy will exactly provide reference for developing other high-performance piezoelectric devices.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yu-Qing Zhang,Qing-Da An,Zuo-Yi Xiao,Kai-Ruo Zhu,Xiao-Ling Dong,Shang-Ru Zhai
Recyclable, non-toxic, and degradable biological substrates contribute significantly to super-wetting surfaces. In this work, we prepared magnetic micro-nano super-hydrophobic surfaces through a robust solution with magnetic modified lignin particles as the supporting structure. A novel PDMS (polydimethylsiloxane)/magnetic lignin particle (lignin@Fe 3 O 4 )/PDA sponge composite was fabricated. Through dopamine (DA) self-polymerization, covalent deposition of magnetic lignin (ML), and PDMS silane modification, the magnetic super-hydrophobic polyurethane sponge composite (Sponge-P) was synthesized so that the Fe 3 O 4 nanoscale microspheres wrapped with microscale lignin magnetic particles adhered to the sponge surface tighter and were barely dislodged. The as-prepared Sponge-P displayed excellent flexibility and a water contact angle of up to 152.2°. The super-hydrophobic sponge prepared with the proposed method was acid-base stable (pH = 2–12), self-cleaning, and suitable for high-salinity seawater. The magnetic super-hydrophobic sponge has good oil-water separation ability and can absorb 43 times its own weight of oil. In the meantime, due to the introduction of magnetic materials into lignin, we not only constructed micro-nanostructures to improve the surface super-hydrophobicity, but also made Sponge-P have the function of magnetic recovery, which has a unique advantage in treating oily wastewater.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 16
·2660
·
IF 4.329
Zibo Zhou,Guozhang Wu
This study aimed to improve polydimethylsiloxane (PDMS) conversion in the preparation of polycarbonate (PC)–polydimethylsiloxane (PDMS) copolymer through melt polycondensation. We examined the transesterification process of PDMS with diphenyl carbonate (DPC) and its copolymerization products with bisphenol-A (BPA) for different chain lengths of PDMS. The key factors affecting PDMS conversion were investigated. Results showed that long-chain PDMS required a higher critical transesterification level (38.6%) to improve miscibility with DPC. During polycondensation, side reactions were more prone to occur when the equilibrium transesterification level of long-chain PDMS was lower. PDMS conversion was also lower when more short-chain PDMS was fed. Increasing the chain length of PDMS also reduced PDMS conversion. Notably, increasing the amount of KOH can significantly improve PDMS conversion throughout the polycondensation stage by increasing the equilibrium transesterification level of long-chain PDMS, thereby inhibiting the occurrence of side reactions.Keywords:PC-PDMS copolymer;melt polycondensation;miscibility;equilibrium transesterification level;conversion
研究领域:
材料科学
·
聚合物化学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hao Tong,Hang Chen,Yali Zhao,Miaomiao Liu,Yi Cheng,Jie Lu,Yehan Tao,Jian Du,Haisong Wang
Ideal adsorption material with large adsorption capacity, strong mechanical strength and satisfied reusability plays crucial role in efficient industrial wastewater treatment and oil-water separation. Herein, porous reduced graphene oxide/poly(ethyleneimine)/polydimethylsiloxane (rGO/PEI/PDMS) sponge with robust structure was proposed under mild conditions. Owing to the enhanced interfacial interaction between rGO and PDMS when employing PEI as adhesion layer, the rGO layer was tightly stacked onto the surface of porous channels within PDMS skeleton. Compared to the pristine PDMS sponge, the water contact angle, maximum adsorption capacity towards chloroform and compressive strength at 60% strain of the champion rGO/PEI/PDMS sponge were effectively increased from 101°, 7.38 g/g and 35.82 kPa to 135°, 16.38 g/g and 111.78 kPa, respectively. The porous rGO/PEI/PDMS sponge also demonstrated good adsorption capacities towards various substrates, including organic solvents (carbon tetrachloride, chloroform, dichloromethane , dimethylformamide , n-hexane, petroleum ether, and toluene) and oils (pump oil, silicone oil soybean oil). The rGO/PEI/PDMS sponge was further assessed as oil/water separation material, displaying high efficiency and good selectivity to the representatives of both heavy and light oils. More importantly, the resultant sponge delivered excellent recyclability without obvious attenuation of adsorption capacity at least 60 cycles. This work proposed a perspective for rational designing and fabricating efficient adsorbent with robust structure and durability in practical application.
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
Separations
·
2022
·Vol. 9
·期 3
·64
·
IF 3.344
Weibin Cai,Jiangyu Xie,Jingyu Luo,Xiaohan Chen,Mingqian Wang,Yujun Wang,Jiding Li
In this study, zeolite molecular sieve SAPO-34/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared to recover propane. n-Octyltrichlorosilane (OTCS) was introduced to improve compatibility between SAPO-34 and PDMS, and enhance the separation performance of the MMMs. Physicochemical properties of the MMMs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and water contact angle (WCA). Results showed that, after modification, alkyl chains were successfully grafted onto SAPO-34 without changing its crystal structure, particles in the MMMs were evenly distributed in the base film, and the hydrophobicity of the MMMs was enhanced. Moreover, the effects of SAPO-34 filling content, operating pressure, and feed gas concentration on the separation performance was explored. This indicated that the modification with OTCS effectively enhanced the separation performance of SAPO-34/PDMS MMMs. When the filling content of modified SAPO-34 was 15%, the maximal separation factor of 22.1 was achieved, and the corresponding propane permeation rate was 101 GPU.Keywords:MMMs;SAPO-34;PDMS;OTCS;propane recovery
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
危险品化学品经营许可证（带存储）