Journal of Water Process Engineering
·
2024
·
IF 6.3
Zhaohui Zhang,Wenshuo Hu,Cong Ma,Tong Zhang,Liang Wang
Understanding the irreversible fouling mitigation performance of conductive membranes is crucial for engineering applications. In this study, the effectiveness of conductive membranes in mitigating the irreversible fouling caused by typical membrane pollutants and actual surface water was investigated. The results indicated that the conductive membranes had the greatest mitigating effect on irreversible fouling caused by humic substances and the weakest mitigating effect on that caused by proteins. The growth rates of irreversible membrane fouling over five-cycle filtration with conductive membranes were reduced by 58.6 % (humic acid), 42.3 % (sodium alginate), and 30 % (bovine serum albumin) compared to those without power. Moreover, conductive membranes exhibited a commendable irreversible fouling mitigation effect when treating real surface water. The irreversible fouling growth rate and resistance decreased by 41.6 % and 49.9 %, respectively, compared to those without power. Although the increase in the ionic strength of the feed water weakened the effectiveness of the conductive membranes in irreversible fouling mitigation, it was still significantly better than that without power.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Yan Zhou,Changhong Lin,Yuming Yang
Herein, PVDF membranes with excellent UV-absorbing property were first synthesized through grafting the polymerizable low-molecular-weight organic UV-absorber 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone (BPMA) onto α-bromoester-functionalized PVDF membranes via the surface-initiated activator generated by electron transfer atom transfer radical polymerization (SI-AGET ATRP). The surface initiators were immobilized by the reaction between 2-bromoisobutyryl bromide (BIBB) and the hydroxylated PVDF membranes. PVDF-g-PBPMA membranes with different grafting densities were obtained by tuning the polymerization time and the modified membranes were characterized by 1 H-NMR, FT-IR, XPS, SEM, UV–vis Spectrophotometer, TGA and DSC. The experimental results indicated that PBPMA chains were successfully introduced onto PVDF membranes. Most importantly, the PVDF-g-PBPMA membranes exhibited outstanding UV-shielding property. UV–vis transmittance spectra showed that most UV light below 360 nm could be absorbed by PVDF-g-PBPMA membranes and the whole UV light region (200–400 nm) can be blocked with the reaction time increased.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2020
·Vol. 21
·期 12
·4224
·
IF 4.556
Wenxiu Yang,Yonggui Li,Long Feng,Yimiao Hou,Shuo Wang,Bo Yang,Xuemin Hu,Wei Zhang,Seeram Ramakrishna
Photothermal conversion materials have attracted wide attention due to their efficient utilization of light energy. In this study, a (GO)/Bi2S3-PVDF/TPU composite nanofiber membrane was systematically developed, comprising GO/Bi2S3nanoparticles (NPs) as a photothermal conversion component and PVDF/TPU composite nanofibers as the substrate. The GO/Bi2S3NPs were synthesized in a one-step way and the PVDF/TPU nanofibers were obtained from a uniformly mixed co-solution by electrospinning. GO nanoparticles with excellent solar harvesting endow the GO/Bi2S3-PVDF/TPU membrane with favorable photothermal conversion. In addition, the introduction of Bi2S3NPs further enhances the broadband absorption and photothermal conversion properties of the GO/Bi2S3-PVDF/TPU composite membrane due to its perfect broadband absorption performance and coordination with GO. Finally, the results show that the GO/Bi2S3-PVDF/TPU composite membrane has the highest light absorption rate (about 95%) in the wavelength range of 400–2500 nm. In the 300 s irradiation process, the temperature changes in the GO/Bi2S3-PVDF/TPU composite membrane were the most significant and rapid, and the equilibrium temperature of the same irradiation time was 81 °C. Due to the presence of TPU, the mechanical strength of the composite film was enhanced, which is beneficial for its operational performance. Besides this, the morphology, composition, and thermal property of the membranes were evaluated by corresponding test methods.Keywords:graphene oxide/bismuth sulfide;solar distillation;nanofiber membrane;photothermal conversion
研究领域:
材料科学
·
纳米技术
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太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2024
·
IF 1.7
Ziyu Liu,Yanqing Liu,Chong Zhang,Takashi Sakamaki,Xianning Li
Conductive filter membranes have shown great potential in alleviating membrane fouling. In this study, polypyrrole (PPy) was used as the conductive material and sodium anthraquinone-2-sulfonate (AQS) was used as the dopant to perform surface modification on the PVDF membrane. After modification, the contact angle of the membrane decreased from 79.40° to 48.57°, and the electrical conductivity of membrane increased from zero to 1.60 S/cm. The good hydrophilicity and electrical conductivity of PPy-AQS/PVDF endowed it with superior antifouling capabilities, reducing the static protein (BSA) adsorption from 0.147 mg/cm 2 to 0.097 mg/cm 2 . Under the action of an electric field of −0.1 V, the flux decay rate of PPy-AQS/PVDF decreased, and the flux recovery rate improved.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Jia-Feng Xu,Jia-Cheng Wu,Lu-Jiong Ruan,Wei Tian,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Coupling photocatalysis with membrane separation technology becomes one pioneering method to solve the membrane fouling . In this study, Ag@SnS photocatalyst was synthesized and blended with polyvinylidene fluoride (PVDF) to fabricate Ag@SnS/PVDF composite membranes via non-solvent induce phase separation (NIPS) method. The results show that with the addition of Ag@SnS, water flux of Ag@SnS/PVDF hybrid membranes increases due to the enhanced membrane hydrophilicity and increased porosity. The optimal hybrid membrane (MAS-2) exhibits the rejection rate of 97.0 % and 95.4 % for BSA and HA accompanied with a water permeance of 578.5 L m −2 h −1 bar −1 . Moreover, MAS-2 membrane reveals excellent self-cleaning ability by photodegradation of HA on membrane surface , and its flux recovery rate (FRR) can achieve 91.7 % after UV irradiation and 95.8 % after 3 h natural sunlight irradiation via photocatalysis regeneration. The heterostructure of Ag@SnS can assist separation of photoinduced electrons and holes by transferring photoinduced electrons to Ag nanoparticles with enhanced photocatalytic activity. After three cycles, the FRR can still reach around 90.0 %, revealing its outstanding cleaning ability. Therefore, the Ag@SnS/PVDF membranes have a foreseeable potential in the field of water treatment due to its high flux performance, self-cleaning ability via photocatalysis process.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 13
·2631
·
IF 4.967
Boyan Zhao,Yaxiong Tan,Feipeng Wang,Li Yang,Nuo Cheng
Insulating oil is a pivotal component of power transformers, but it suffers from aging byproducts during service operation. The aging byproducts from the degradation of oil insulation tend to induce insulation failure, which poses a significant threat to the security of the power grid. Therefore, the regeneration of insulating oil is required to prolong the useful life of insulating oil and hence be of economic and ecological interests. Typical in-use oil regeneration routes employ multi-step procedures. In this work, a one-step regeneration method using a PVDF/BaTiO3composite membrane is proposed. BaTiO3endows the composite membrane with improved hydrophobicity and an electret state. The regeneration performance of the PVDF/BaTiO3nanofiber membrane was assessed by considering the acid value, moisture content, dielectric loss factor tan δ, and the AC breakdown voltage of the refreshed oil. The test results showed that the filtration efficiencies toward formic acid and moisture were up to 77.5% and 60.6%, respectively. Moreover, the dielectric loss factor tan δ of the refreshed oil decreased evidently at a power frequency, and the AC breakdown voltage rose from 23.7 kV to 38.9 kV. This suggests that the PVDF/BaTiO3composite membrane may be employed efficiently, and it minimizes aging byproducts via the one-step filtration.Keywords:electret;insulating oil regeneration;PVDF/BaTiO3nanofiber;electric field
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qian Wang,Xue Zhu,Xinglin Li,Lin Chen,Hengyang Mao,Xiaoshan Meng,Taoli Huhe,Zhengzhong Zhou
Membrane separation technology with high separation efficiency and low energy consumption are one of the keys to tackle the water-energy crisis. However, membrane fouling can reduce membrane life and performance, limiting its application. In this work, hydrophilic modifier sodium lignosulphonate (SLS) and antibacterial agent CuCl 2 were adopted as additives to modify PVDF membranes. The addition of SLS can optimize the structure of PVDF membranes and increase hydrophilicity, enhancing separation and anti-fouling performance. Moreover, the SLS can fix Cu 2+ effectively onto the membrane for improved antibacterial performance, as the leakage of Cu 2+ is reduced greatly, compared to Cu-PVDF membranes without SLS. The simulation based on density functional theory proved that the binding energy of SLS and Cu 2+ is 2.7 times of that of PVDF and Cu 2+ . Finally, the prepared anti-fouling Cu-SLS/PVDF membrane was applied in the separation of simulated Escherichia coli fermentation broth, exhibiting long-term antibacterial and anti-fouling property. This work provides a new idea for the preparation of long-term anti-fouling and antibacterial membrane, and has good potential in the recovery of fermentation broth.
研究领域:
环境科学
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材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 9
·5032-5041
·
IF 2.047
Li Zhenhui,Chen Jianwen,Wen An,Guo Fang,Hu Dengyan,Zhu Wenbo,Chen Wenjun
Temperature-sensitive and flexible nanocomposite films are prepared by doping a poly(vinylidene fluoride) (PVDF) matrix with cobalt oxide (Co 3 O 4 ) nanoparticles. The structural and morphological characterization, dielectric properties, and conductivity of the Co 3 O 4 /PVDF nanocomposites are then systematically investigated. The nanocomposite film loaded with 10 wt.% Co 3 O 4 displays dielectric permittivity of 37 at 1 kHz, which is about 274% higher than that of pristine PVDF (13.5 at 1 kHz). The dielectric constant of the 10 wt.% Co 3 O 4 /PVDF nanocomposite as a function of absolute temperature can be fitted as \( T = 26.62 \times \ln \left( {(\varepsilon_{r} - 40.595)/1.335 \times 10^{ - 5} } \right)\) over a range of 300–423 K at 1 kHz. This fitting formula may provide important reference values for the design of flexible temperature sensors. The temperature coefficient of the dielectric constant (at 1 kHz) for the 10 wt.% Co 3 O 4 /PVDF nanocomposite film is 0.94% K −1 within a range of 350–423 K, and conductivity of about 5.78 × 10 −5 S / cm is achieved at 383 K, which is four orders of magnitude larger than that for the pristine PVDF (3.9 × 10 −9 S / cm). These results show that the addition of Co 3 O 4 nanoparticles in PVDF matrix significantly improves the dielectric constant and temperature sensitivity of the composites. Thus, the Co 3 O 4 /PVDF nanocomposites show potential application prospects in miniaturized and flexible temperature sensors.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2024
·
IF 10
Yulong Qiao,Mengyang Wang,Hewei Ding,Jin Li,Junmei Zhang,Guiguang Qi,Xiongbo Yang,Xinyu Tan
When using high-power devices outdoors, especially in sunny summers, power losses coupled with direct sunlight can cause devices to overheat. This overheating not only disrupts their normal functioning but also increases the risk of fire accidents. To address this issue, the flexible polyvinylidene fluoride (PVDF)/strontium titanate (SrTiO 3 , denoted as ST) composite films (abbreviated as P-S-x where x represents the mass ratio of PVDF to ST, x = 0.5, 1, 1.5, 1.75) were developed through a simple mixing method. Outdoor Radiant Cooling tests demonstrate that the P-S-1.75 sample exhibits an average cooling effect ∼14.2 °C compared with pure PVDF sample and an average cooling effect ∼20.2 °C compared with a bare Al sample. The P-S-1.75 sample with a thickness of 115 μm achieves exceptional performance in the broadband mid-infrared range from 2.5 to 25 μm with an average emissivity reaching about 97 %. And the max reflectance of P-S-1.75 sample reaches 90 % in the range of 0.5–2.0 μm. Furthermore, P-S-1.75 sample obtains a thermal conductivity ∼1.97 W/(m·K) which is about ten times higher than that of pure PVDF (0.2 W/(m·K)), and a cooling effect of 11.7 °C on the ceramic heating plate was obtained. The outstanding cooling performance exhibited by P-S-1.75 coating can be attributed to its exceptional radiative cooling capacity and high thermal conductivity. This work provides a new idea to obtain polymer/ceramic composite materials with excellent radiative cooling performance in cooling applications.
研究领域:
材料科学
·
能源工程
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2022
·Vol. 29
·期 6
·2190-2198
·
IF 2.509
Feipeng Wang,Zijian Yang,Jingliang Huang,Yuyang Yan,Jian Li
Insulating oil is indispensable cooling impregnation and isolation agent for oil-filled electrical equipment, such as power transformers. The aging byproducts, i.e., water and organic acids, impose a serious threat to these expensive transformers. Insulating oil reclamation is a complicated process. In this article, a polyvinylidene fluoride (PVDF) polymer with polytetrafluoroethylene (PTFE) additive composite nanofiber membrane is synthesized for insulating oil reclamation with high efficiency. The reclamation and dielectric performance of the PVDF/PTFE nanofiber membrane is evaluated by the acid value, microwater (MW) contents, and ac breakdown voltage of the treated oil. The results show that the nanofiber membrane filtration rate toward acetic acid and MW is 69.4% and 76.0%, respectively. Moreover, the dielectric loss factor and relative permittivity of treated oil decrease significantly at low frequencies, and the breakdown voltage is increased from 21.8 to 65.2 kV. The PVDF/PTFE composite nanofiber membrane has removed organic acid and MW effectively, and it provides a more practical method for insulating oil reclamation.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
BIOFOULING
·
2013
·
IF 3.396
Xiang Shen,Yiping Zhao,Li Chen
Biofouling of membrane surfaces by the attachment of microorganisms is one of the major obstacles for ensuring the effectiveness of membrane separation processes. This work presents the construction of a zwitterionic PVDF membrane surface with improved resistance to biofouling. An amphiphilic copolymer of poly(vinylidene fluoride)-graft-poly(N,N-dimethylamino-2-ethylmethacrylate) (PVDF-g-PDMAEMA) was first synthesized via radical graft copolymerization and then the flat membrane was cast with immersed phase inversion. The PDMAEMA side chains tended to aggregate on the membrane surface, pore surface and internal pore channel surface, and were converted with 1,3-propane sultone (1,3-PS) to yield a zwitterionic membrane surface. A higher conversion of PDMAEMA chains and distribution of zwitterions were obtained using a longer treatment time. A biofouling assay indicated that incorporation of zwitterions suppressed the adsorption of extracellar polymer substances and the adhesion of Escherichia coli bacterial cells to the membrane surface, endowing the membrane with a high flux recovery and biofouling resistance in the filtration process.
研究领域:
材料科学
·
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Fangwei Qi,Xiuwen Gao,Shuping Peng,Wenjing Yang,Guowen Qian,Sheng Yang,Cijun Shuai
Piezoelectric polyvinylidene fluoride (PVDF) provided an opportunity for non-invasive in situ electrical stimulation of cell behavior, yet its electroactive β phase was difficult to obtain due to its instability in the molten state. Herein, polyaniline (PANI) protrusions were in situ oxidation-polymerized on molybdenum disulfide (MoS2) nanosheets (PANI-MoS2). Then, PANI-MoS2 was introduced into laser additive-manufactured PVDF scaffolds. On the one hand, PANI protrusions produced steric hindrance between adjacent MoS2 nanosheets and inhibited the stacking and aggregating of MoS2. On the other hand, PANI-MoS2 could serve as a platform to achieve interfacial polarization locking. Specifically, Mo–S dipoles in MoS2 and π electron clouds over the N atom in PANI locked −CH2 dipoles in PVDF through electrostatic and hydrogen bond interactions, respectively, which forced −CH2 to align perpendicularly to the basal plane of MoS2 and bialy to one side of the PVDF main chain, thereby forming a full-reverse planar zigzag configuration of the polarized β phase and maintaining its stable existence. The results demonstrated that the β phase of the scaffolds was significantly increased from 43 to 90%, which resulted in an enhanced electrical output performance. The improved electrical output greatly promoted osteoblast-like cell proliferation and differentiation. Furthermore, owing to the pulling-out effect of MoS2 and improved interfacial stress transfer between MoS2 and the polymer matrix, the mechanical properties of scaffolds were also enhanced. These findings suggested that the piezoelectric scaffolds had great potential in bone tissue engineering.
研究领域:
材料科学
·
生物医学工程
·
组织工程
✓ 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）