SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Meng-Chao Yu,Xiaojie Xu,Tao Wang,Ying-Nan Feng,Zhi-Ping Zhao
Membrane distillation has long been a potential desalination technology. Recently, spray-assisted non-solvent induced phase inversion (SANIPS) was proposed as a facile and effective method to prepare microporous hydrophobic membranes for membrane distillation. However, the membrane formation process is not fully disclosed. In this paper, SANIPS is employed to fabricate hydrophobic PVDF membranes. The influencing factors on membrane structure and performance are investigated. Membrane structure is greatly affected by the choice of solvent and non-solvent spray. The interactions between different non-solvent sprays (water and ethanol) and solvents (TEP, NMP and DMF) and the effects of operating conditions on membrane formation are explored. Thermodynamic and kinetic analyses of the membrane formation process suggest that the membrane formation process is dominated by the kinetic factors with water being the spray while thermodynamic factors play the major role with ethanol being the spray. A hydrophobic membrane with water contact angle of 135.93 ± 4.38° and LEP of 2.5 ± 0.4 bar was successfully prepared by using ethanol as the non-solvent spray, which demonstrates a stable desalination performance (initial flux of 19.88 ± 1.39 kg·m −2 ·h −1 and salt rejection higher than 99.97 %) in vacuum membrane distillation. This study may provide pertinent insights into the rational control of membrane structure and performance of hydrophobic PVDF membranes.
研究领域:
化学工程
·
材料科学
·
海水淡化技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Yanfei Liu,Tonghu Xiao,Chenghuan Bao,Yuhua Fu,Xing Yang
This study proposed to use the nonsolvent thermally induced phase separation (NTIPS) method to fabricate a novel Janus membrane for MD applications. The as-prepared dual-layer membrane consisted of a thin hydrophobic PVDF top-layer and a relatively thick hydrophilic PVDF-PVA sub-layer. By adopting a facile one-step co-casting technique and water soluble diluent ε-caprolactam (CPL), delamination-free dual-layer membrane was obtained. The SEM morphologies and FTIR crystalline analyses suggested the membrane formation mechanisms, where the hydrophobic top-layer was formed via NTIPS process, resulting in an ultra-thin dense skin with finger-like pores formed beneath; while the hydrophilic sub-layer was induced by TIPS, producing highly porous cellular structure with high degree pore interconnectivity. Combining the structural observation and MD performance results, suitable fabrication parameters were identified as a PVDF concentration of 15 wt% for the hydrophobic layer and coagulation temperature between 20 and 40 °C. The total membrane thickness was optimized as 100–150 µm, given the thickness of hydrophobic layer kept within an optimal range of 30–60 µm to ensure minimal mass transfer resistance. The Janus membrane exhibited stable salt rejection above 99.5% over continuous MD runs and superior permeation flux up to 165.3 kg m -2 h -1 at 80 °C, which was remarkably higher than reported MD membranes.
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
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Jingyan Wang,Yaning Li,Zhiwei Han,Saichao Song,Jian Li
Oxidants, such as oxygen, cannot easily approach the core Al due to the presence of dense alumina on the surface of aluminum particles, thereby resulting in high ignition temperature and long ignition duration. To overcome this challenge, we employed the solvent/non-solvent method using Viton A (a copolymer of 1,1-difluoroethylene and hexafluoropropylene) as a coating material to prepare the core-shell Al/Viton A composite particles . An orthogonal experiment was designed to identify the optimal preparation parameters by evaluating the peak pressure in a closed vessel. The sample with the largest peak pressure was compared with raw Al and Al/Viton A (prepared by the physical mixing method) using the combustion pressure and open combustion tests to evaluate the solvent/non-solvent method. The results from the orthogonal experiment revealed that the water bath temperature exhibited the greatest influence on the coating effects. The composite prepared under a water bath temperature of 55 °C and a stirring rate of 250 rpm, using 20 mL of acetone and a 5 mL/min dripping rate of the Viton A acetone solution, were uniformly coated by Viton A, and exhibited excellent combustion characteristics. In addition, the sample generated using the optimal preparation parameters burnt more vigorously and rapidly than raw Al and Al/Viton A. Finally, the reaction molecular dynamics simulation was employed to gain insight into the effect of Viton A on the combustion of Aluminum particles at the molecular level.
研究领域:
材料科学
·
燃烧化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Qingcai Chen,Haoyao Sun,Mamin Wang,Zhen Mu,Yuqin Wang,Yanguang Li,Yansong Wang,Lixin Zhang,Zimeng Zhang
To understand the nature and possible sources of environmentally persistent free radicals (EPFRs) in atmospheric aerosols, the present study used a solvent extraction method to fractionate aerosol components with different polarities and solvent resistance in fine particulate matter (PM2.5) from Xi’an, China. The characteristics of EPFRs, that is., their concentration, type and lifetime, were obtained based on their electron paramagnetic resonance spectra. The results showed that the EPFRs in the PM2.5 samples were carbon-centered with a nearby heteroatom (g = 2.0031) and had a long half-life of more than 3 years. Nearly all of the extractable EPFRs were detected in the water-insoluble organic fraction and showed characteristics indicating that may contain oxygen-centered radical (g = 2.0038). Most of the total EPFRs in the PM2.5 were derived from solvent-resistant organic matter (88%), which likely consisted of graphene oxide analogues. The results suggest that previous studies may have missed the major proportion of EPFRs in atmospheric particulates if they only focused on solvent-extractable or metallic oxide-formed EPFRs. Our results showed that the EPFR concentration was significantly and positively correlated with the elemental carbon and NO2 concentrations, suggesting that traffic emissions may be an important source of EPFRs in PM2.5 over Xi’an.
研究领域:
环境科学
·
大气化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Hai-Ming Song,Cheng Chen,Xiao-Xue Shui,Hao Yang,Li-Jing Zhu,Zhi-Xiang Zeng,Qun-Ji Xue
Although Janus membranes have been fabricated for the separation of oil/water mixtures, simplifying the construction processes is still a thorny challenge. In this work, a facile and easily scale-up approach based on in situ mussel-inspired chemistry is reported for the first time to prepare the Janus membrane with unidirectional oil/water separation. Here, the poly (vinylidene fluoride)/polydopamine/polyethylenimine (PVDF/PDA/PEI) membranes on the polyester non-woven fabric were fabricated via non-solvent induced phase separation (NIPS) technique. In the coagulation bath, the reactive oxygen species (ROS) produced by CuSO 4 /H 2 O 2 improved the formation of the hydrophilic PDA/PEI on the top surface of the membrane. The hydrophobic bottom surface was received after the membrane was stripped from the supporting fabric. Scanning electronic microscopy (SEM), confocal laser scanning microscopy (CLSM), attenuated total reflectance Fourier transform infrared spectrometer (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were used to characterize the membrane. The Janus membrane showed asymmetric wettability with 152.2° underwater oil contact angle of F-T5 and 153.3° underoil water contact angle of B-T5. Furthermore, by this in situ mussel-inspired chemistry, the Janus membrane showed excellent water and oil separation, antifouling performance and stability, which can potentially be used for unidirectional oil/water separation.
研究领域:
材料科学
·
环境科学
·
界面化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zhencheng Liao,Yu Liu,Chonghao Chen,Iek Man Lei,Lei Dong,Chunming Wang
Three-dimensional printing of microchannel networks mimicking native vasculature provides essential functions for biomedical applications. However, developing a highly “adaptable” technique – that can adjust to diverse materials choices, high shape accuracy, and broad size ranges – for producing physiologically responsive vasculature remains challenging. Here, an innovative hydrogen bond re-orientation (HyBRO) strategy for microchannel network fabrication is reported. By identifying interfacial instability of sacrificial material (SM) during embedding as a core limitation, this strategy prints the SM into an optimal “nonsolvent” to shape the desirable channel structure. In this process, the nonsolvent instantaneously switches the SM from forming hydrogen bonds with exterior water to forming interior linkages inside it. This transition protects the SM from external solvent “erosion” upon re-exposure to embedding material, inhibiting deformation. Consequently, this approach enables the creation of accurate (>90%), multiscale (10-fold), hierarchical microchannel networks, accommodating accurate printing of a wide range of ink materials – extending from typical hydrophilic polymers into non-typical hydrophobic ones. Further biological tests demonstrate that HyBRO-produced vasculature recapitulates not only essential endothelial barrier function but also delicate ion-channel responses to varying shear stresses, highlighting its potential for engineering physiologically responsive vasculature in broad applications.
研究领域:
生物医学工程
·
组织工程
·
3D打印技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yiran Miao,Pengyun Yu,Fan Yang,Yueting Zhao,Haiyan Xu,Jianping Wang
In sodium-ion batteries (SIBs), the performance of a single solvent often does not meet actual requirements and a cosolvent or nonsolvating solvent is needed. However, the effect of these electrolyte additives on the solvation structure and dynamics of Na+ in SIBs is yet to be fully understood. Herein, electrolyte structural dynamics are examined for NaPF6 in dimethyl carbonate (DMC) with 1,1,2,2-tetrafluoro-2,2,2-trifluoroethoxy ethane (HFE) as the nonsolvating solvent or propylene carbonate (PC) as the cosolvent using steady-state and time-resolved infrared (IR) spectroscopies. Molecular dynamics simulations show that the solvation size of Na+ decreases with a loosened structure upon adding the nonsolvating solvent, whereas its first solvation shell becomes denser and the second one becomes softened with decreased participation of the PF6– anion upon adding the cosolvent. While a decreased participation of DMC in the solvation layer of Na+ is suggested by linear IR results, an increased structural inhomogeneity (and hence overall more dynamical fluctuations) is found for Na+-coordinated DMC upon adding both additives by two-dimensional (2D) IR spectroscopy where the carbonyl stretch is used as a probe. The Na+/DMC/PC complex is found to structurally evolve slower than both Na+/DMC and Na+/DMC/HFE complexes on the picosecond time scales by spectral diffusion dynamics extracted from 2D IR diagonal signals. Frontier orbital theory calculations also indicate that both solvent additives are beneficial to increasing the stability of PF6–. The results obtained in this work provide important insights into the roles played by the solvent additives in influencing the solvation structures and dynamics of Na+, which are critical for understanding the Na+ transfer mechanism in SIBs.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xuan Xie,Jingyi Kang,Si Chen,Qin Zhang,Xin Liu
Stiffness switching hydrogels have been in high demand for intelligent devices, adhesion science, soft robotics, and flexible electronics. However, it is challenging to post-tune the mechanical properties of a hydrogel once the polymer network structure is formed. Inspired by the cononsolvency effect, we prepared a mechanics-switching colloidal hydrogel through the precipitation polymerization of methacrylamide in mixed dimethyl sulfoxide and water solvents. The colloidal network enables the hydrogels to simultaneously strengthen, stiffen, and toughen. The colloidal hydrogels not only display a broad spectrum of adjustable mechanical properties (ranging from 0.08 to 57.1 MPa) via solvent response but also accomplish reversible stiffness conversion through the solvent-tuned conformational adjustment of colloidal polymer networks, with the maximum modulus conversion reaching 1427, and exhibit solvent-responsive shape memory. Based on the stable and tight colloidal network, the hydrogels exhibit antiswelling properties in various aqueous solutions and solvents. The colloidal hydrogel would provide more possibilities in various applications, such as antiimpact protection, shape memory, electronic switches, and intelligent engineering materials. It is envisioned that this work will provide key opportunities in developing mechanics-switching and on-demand tuning of soft materials for tissue engineering, flexible electronics, and biomedical science.
研究领域:
材料科学
·
生物医学工程
·
软物质物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiajing Zhang,Zhuan Fu,Qimeng Zhu,Sijie Zhou,Liangjun Xia,Chunhua Zhang,Xin Liu,Weilin Xu
Textile composites are ubiquitous in daily life and are one of the main ways in which bacteria and viruses spread. Highly effective antibacterial and antiviral flexible composites are effective for reducing microbe transmission. Herein, we reported an improved nonsolvent-induced phase separation method for the fabrication of flexible textile composites. Cu 2 O/polyurethane (Cu 2 OPU) composite films containing antibacterial and antiviral coatings were constructed using a Cu 2 O-polyvinyl butyral coagulation bath and binary solvent mixtures, yielding a composite that had excellent mechanical properties and stability and the components did not leach out. The as-prepared Cu 2 OPU composite films exhibited strong antibacterial and antiviral activity against Staphylococcus aureus and the H1N1 virus (above 99.99 % inactivation ratio). What’s more, Cu 2 OPU has excellent mechanical and environmental stability owing to the strong interfacial adhesion of Cu 2 O with the polymer matrix. Furthermore, it can withstand multiple washes and be suitable for daily use. Cu 2 OPU may be sustainably produced with great scalability, which may meet public, home, and textile applications.
研究领域:
材料科学
·
生物医学工程
·
纺织科学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2016
·
IF 3.897
Ailin Gao,Qing Yang,Lixin Xue
The crystallinity of semi-crystallized Poly ( l -Lactic acid) (PLLA) is low, especially as a porous membrane prepared from non-solvent induced phase separation (NIPS) process. To improve the crystallinity and thermal stability of PLLA porous membranes, hexafluoroisopropanol (HFIP) was added into the PLLA casting solution together with a small amount of Silk Fibroin (SF). It is found that by optimizing the additive amounts of HFIP and SF, PLLA composite membranes with improved crystallinity (up to 47.1%) and endurance to temperature (above 90 °C) could be prepared with comparable mechanical property to the virgin PLLA membranes. The effects of HFIP in NMP solution on PLLA during the NIPS process was further investigated using dynamic rheological methods relating to the crystallinity of the formed PLLA porous membranes.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 4
·373
·
IF 2.654
Xiaoxia Sun,Kunpeng Wang,Yu Shu,Fangdong Zou,Boxing Zhang,Guangwu Sun,Hiroshi Uyama,Xinhou Wang
In this study, novel photocatalyst monolith materials were successfully fabricated by a non-solvent induced phase separation (NIPS) technique. By adding a certain amount of ethyl acetate (as non-solvent) into a cellulose/LiCl/N,N-dimethylacetamide (DMAc) solution, and successively adding titanium dioxide (TiO2) nanoparticles (NPs), cellulose/TiO2composite monoliths with hierarchically porous structures were easily formed. The obtained composite monoliths possessed mesopores, and two kinds of macropores. Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Brunauer-Emmett-Teller (BET), and Ultraviolet-visible Spectroscopy (UV-Vis) measurements were adopted to characterize the cellulose/TiO2composite monolith. The cellulose/TiO2composite monoliths showed high efficiency of photocatalytic activity in the decomposition of methylene blue dye, which was decomposed up to 99% within 60 min under UV light. Moreover, the composite monoliths could retain 90% of the photodegradation efficiency after 10 cycles. The novel NIPS technique has great potential for fabricating recyclable photocatalysts with highly efficiency.Keywords:photocatalyst;non-solvent induced phase separation;monolith;cellulose;TiO2
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Polymeric Materials and Polymeric Biomaterials
·
2017
·
IF 1.515
Ping Jiang,Jinlong Zhang,Shan Shan Jia,Yiqiang Wu,Qinlin Wu
First, ethyl cellulose-g-poly(2-(dimethylamino) ethyl methacrylate) (EC-g-PDMAEMA) was synthesized through atom transfer radical polymerization. Second, the polymer was used to prepare self-supporting microporous membranes through nonsolvent-induced phase separation process. The chemical structures of EC0.2-g-PDMAEMA15 was confirmed by 1H NMR and FTIR. And the copolymer micelles were characterized by UV, laser particle-size analysis, and TEM. The results indicated that the copolymer had pH- and temperature-responsive behaviors. Furthermore, the morphology study of microporous membranes indicated that the pores became smaller and more uniform with the increase of tetrahydrofuran (THF) content and “open time”, and the most optimal preparation conditions were using 75% THF/25% DMF (v/v) as solvents with the “open time” 30 s. What’s more, the membranes were responsive to pH and temperature stimulus in terms of water flux.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）