CRYSTENGCOMM
·
2015
·Vol. 17
·期 45
·8697-8702
·
IF 4.034
Xiaolin Wu,Jiang-Long Wang,Hongrui Zhang,Shufang Wang,Shengjun Zhai,Yaguang Li,Dogheche Elhadj,Guangsheng Fu
c-axis oriented Bi1−xPbxCuSeO (0 ≤ x ≤ 0.8) single crystalline thin films have been successfully epitaxially grown on SrTiO3 (001) substrates via the pulsed laser deposition technique. Detailed X-ray diffraction and transmission electron microscopy measurements reveal the excellent c-axis and ab-plane texture of the films. As the Pb doping concentration increases, both the resistivity and the Seebeck coefficient decrease due to the increase in hole carrier concentration. The highest power factor of about 1.2 mW m−1 K−2 has been achieved in Bi0.96Pb0.06CuSeO single crystalline thin films at 673 K, which is much higher than those of polycrystalline ceramics with random orientation, suggesting that c-axis oriented BiCuSeO-based single crystalline thin films might have great potential for application in thermoelectric thin film devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Yingying Meng,An Li,Huan Li,Zhensheng Shen,Tian Ma,Jiuyi Liu,Zhongze Zhou,Qian Feng,Yingqiang Sun
Membrane blocking is of great importance to nutrients transfer and illumination in attached cultivation of algae, which subsequently affects the biomass and nutrients production of algal biofilm . Accordingly, a vertical-algal-biofilm (VAB) with cellulose acetate (CA) membranes with pore size of 0.45, 1.2, 2.0, and 3.0 μm is settled to study the effect of membrane blocking on attached cultivation of microalgae . According to the results, the algae production is independent of the roughness, hydrophilicity , and surface free energy of membranes because the VAB is inoculated via filtration-on method in this work. Nevertheless, the algae productivity of first-cultivation on VABs increases to 5.02 g/m 2 . day when the pore size of CA membrane increases to1.2 μm, while it decreases to 4.5 g/m 2 . day on VABs with CA-3.0 due to the complete blocking of CA membranes by algae cells. The growth rates of first-cultivation and re-cultivation are well fitted by a logistic model and a linear model, respectively. The total lipids contents of microalgae on different CA membranes are affected by pore size due to the variations of nutrients transfer resistance and light intensity under different membrane blocking models. A maximum total lipids content of algae biomass cultivated on VABs with CA-1.2 is about 23.74% due to the nitrogen starvation and high illumination intensity under intermediate blocking model. Therefore, the attached cultivation of algae on VABs under intermediate blocking model is much favorable for algal biomass and lipid production.
研究领域:
环境生物技术
·
微藻生物能源
·
生物膜工程
·
资源循环利用
·
光生物反应器
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Songchen Xie,Zhiguang Pang,Chunguang Hou,Ngie Hing Wong,Jaka Sunarso,Yuelian Peng
Membrane scaling represents one of the significant challenges for membrane distillation (MD), especially when treating hypersaline brines. This work presents a one-step dip-coating method to develop an omniphobic membrane. The commercial polyvinylidene fluoride (PVDF) hydrophobic porous membranes were immersed into the epoxy acrylic (EA) resin and fluorosilane (1H,1H,2H,2H-Perfluorodecyltrimethoxysilane, PFTS) mixture followed by a heating cross-linking process. EA/PFTS ratio of 1:1 (v/v) gave the best performance regarding surface morphology , surface chemical composition, surface energy, and mechanical property. The resultant PVDF-(EA/PFTS)-1:1 membrane demonstrated excellent wetting resistance and omniphobicity during the penetration of deionized water , 30% and 60% ethanol in water, and kerosene, giving 141°, 124°, 106°, and 116° contact angles, respectively. It also exhibited excellent scaling resistance in concentrating 14.7 mM gypsum solution and actual reverse osmosis (RO) brine. The permeate flux and conductivity were maintained at about 14 kg m −2 h −1 and below 3 μS cm −1 , respectively. More than 99% salt rejection (actual RO brine) was achieved during a long-term continuous MD operation for 80 h. The PVDF-(EA/PFTS)-1:1 membrane exhibited excellent anti-scaling and anti-wetting properties. A series of capillary experiments confirmed that the membrane's surface pores achieved the gas-wetting state. The increase in the membrane surface hydrophobicity , the reduction in the surface pore size, and the toughening of the surface pores contributed to the formation of a stable gas-liquid interface on the modified membrane surface that can enhance the anti-scaling and anti-wetting performance.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Lihao Xu,Yang He,Xia Feng,Fengying Dai,Ning Yang,Yiping Zhao,Li Chen
In the separation of oil/water emulsions using membrane separation methods, fouling remains a problem. To improve the fouling resistance effectively, a hydrophilic tannic acid (TA) coating was constructed on the poly(vinylidene fluoride) (PVDF) membrane via dip-coating method. Both the wettability and surface free energy were dramatically enhanced after the introduction of the TA coating. TA deposition with extended dip-coating time did not result in a corresponding increase in the pure water permeate quality, suggesting that there is a trade-off between the enhanced surface hydrophilicity and diminished pore size. Furthermore, the threshold fluxes were determined using the flux-stepping method, and explored to provide guidance on membrane fouling rates for oil/water emulsion filtration. The hydrophilic TA dip-coated PVDF membrane prepared at a dip-coating time of 9 h exhibited the highest threshold flux compared to the other membranes. The experimental evidences of the threshold fluxes can be used to predict the sustainable flux regimes for the TA dip-coated membranes. Constant flux verifiable experiments for oil/water emulsion were performed at fluxes near and below the threshold fluxes. By selecting a constant flux strategy below the threshold flux, membrane over-fouling can be avoided efficiently and the operating period can be prolonged favourably. More generally, operation below the threshold flux recognizes a modest fouling level, arising from the sufficient flux, which would result in the infrequent need for cleaning and is a compromise between capital expenditure and operating costs.
研究领域:
环境工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Zhong Ma,Guiming Shu,Xiaolong Lu
Excellent antifouling membrane surfaces and membrane cleaning efficiency are immensely desired but challenging to achieve. In this study, we initially prepared pH-responsive hydrophilic membrane surfaces by introducing carboxyl groups onto polyvinylidene fluoride (PVDF) membrane surfaces via amine group bridging. Then, partial perfluoroalkylation modification was performed through an amidation reaction between the carboxyl groups on the hydrophilic membrane surface and amine groups of fluorinated diamine. Therefore, a membrane surface with a discontinuous amphiphobic fluorine island structure was successfully fabricated. Experimental results for soybean oil/water emulsion separation demonstrated that compared with hydrophilic-modified membrane (PVDF–MAH), the stable flux of fluorine island-modified membrane (PVDF–PFOA) increased by approximately 67%. Moreover, compared with the PVDF–MAH membrane, the flux of the PVDF–PFOA membrane at the end of the fourth filtration cycle (i.e., before chemical cleaning) increased by approximately 34% and its flux recovery rate at the beginning of the fifth filtration cycle (i.e., after chemical cleaning) increased by approximately 6%. The as-prepared membrane with fluorine island structure facilitates a new effective method for solving the membrane fouling problem during practical applications of membrane technology .
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
·
2021
·
IF 8.742
Yan Wang,Jingyu Zhang,Chunyang Bao,Xiaoling Xu,Die Li,Jing Chen,Mei Hong,Bin Peng,Qiang Zhang
Novel self-cleaning catalytic membranes are prepared for water treatment via an integration of heterogeneous Fenton and membrane process. Polysulfone (PSF) based functional copolymers with pendant ferrocene groups are facilely synthesized via a combination of controlled radical polymerization and ester coupling reaction. Different catalytic membranes with tuned surface hydrophilicity are then prepared through non-solvent phase inversion method based on functional ferrocene- and hydroxyl-containing PSF. These membranes have demonstrated high activity in catalyzing Fenton-type reactions, which also lead to outstanding antifouling performance for the membrane. Finally, the catalytic membranes are successfully used for treatment of waste water containing different dyes. The proposed strategy in this work may provide worthy guidance to catalytic membranes, which is promising for water purification through simultaneous Fenton reaction and membrane separation .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Qiao-Mei Li,Hou-Ying Ma,Yi-Ning Hu,Yan-Feng Guo,Li-Jing Zhu,Zhi-Xiang Zeng,Gang Wang
The ultrafiltration membranes fabricated by the non-solvent induced phase separation (NIPS) have been widely used as the supports of the polyamide thin film composite (PA TFC) membranes, although they are usually thick, low porosity, and poor chemical stability. Instead, thin polyethylene (PE) lithium battery microporous membrane with high surface porosity and connected pores is used as the support layer. PE membrane was pre-modified by the co-deposition of tannin and 3-aminopropyltriethoxysilane improving its hydrophilicity, and then a uniform and defect-free PA active layer was successfully fabricated by interfacial polymerization. The resultant membrane exhibited high filtration performances in the forward osmosis (FO) process (2 times higher water flux and 90% lower specific salt flux than the commercial HTI-TFC membrane), and efficient separation of NaCl and dyes in nanofiltration (NF) process, outstanding chemical stability and mechanical strength.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Yahui Shi,Jinhui Huang,Guangming Zeng,Wenjian Cheng,Jianglin Hu,Lixiu Shi,Kaixin Yi
Photocatalytic membranes (PMs), coupling of membrane filtration and photocatalysis , have exhibited the potential for application in the wastewater treatment . In this study, we firstly adopted the supramolecular aggregates of melamine (M), cyanuric acid (C), and urea (U) in specific dimethyl sulfoxide (DMSO) as precursors to prepare carbon nitride MCU-C 3 N 4 with high photocatalytic performance, and a kind of novel-designed photocatalytic membrane was prepared via filtrating the mixture of graphene oxide (GO) nanosheets and MCU-C 3 N 4 on PVDF membrane supports, and then crosslinked using glutaraldehyde (GA) to construct a steady coating on the GO/MCU-C 3 N 4 /PVDF membrane. GO/MCU-C 3 N 4 /PVDF composite membrane exhibited higher permeation flux than that of GO/PVDF membrane and exhibited excellent separation performance for oil-in-water emulsion. A visible light-driven self-cleaning four-stage filtration by a self-built dead-end filtration system was carried out to evaluate membrane antifouling property, and GO/MCU-C 3 N 4 /PVDF membrane (M2) possessed higher flux recovery ratio (FRR) (∼92.36%) and lower irreversible fouling resistance (R ir ) ratio (∼8%) under 30min visible-light irradiation, maintaining relatively higher FRR (>72%) during 4 cycling of four-stage filtrating experiments. GO/MCU-C 3 N 4 /PVDF PMs are equipped with high permeation flux, separation performance, anti-fouling property and stability, indicating potential application in water treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 14
·1836-1841
·
IF 3.692
Yingyi Ma,Le Xu,Zijian Wu,Wenlong Zhang,Mingyan Zhang,Zhenfeng He
Graphical Combover : A honeycomb-patterned porous film was prepared through a microemulsion method and used as an effective coating for improving the dielectric and water-resistance properties of polyimide (PI) film without sacrificing its mechanical properties (see figure). Its comprehensive performance was regulated by tuning the structure of the coated porous film. A honeycomb-patterned porous film was conveniently prepared by means of the microemulsion method and then used as an effective coating for improving the dielectric properties and water resistance of polyimide (PI) film while maintaining its mechanical properties. The dielectric properties could be regulated by tuning the structure of the porous film through controlling its formation conditions. When suitable conditions were used, the prepared composite PI film exhibited a significant reduction of 28.3 % in its dielectric constant and 9.48–54.99 % in dielectric loss accompanied by an extremely low water uptake of 0.62 % relative to the 2.47 % of flat PI film. The composite PI film also displayed excellent durability under moist conditions, as the dielectric constant was still below 2.4 after exposure to 75 % relative humidity for more than 12 h. This provides a novel method to improve and control the dielectric properties of materials. It also suggests that this film is a suitable candidate for coating dielectric materials in high-humidity environments.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
iScience
·
2021
·Vol. 24
·期 6
·102576-102576
·
IF 5.458
Zehai Xu,Yufan Zhang,Xu Zhang,Qin Meng,Yujie Zhu,Chong Shen,Yinghua Lu,Guoliang Zhang,Congjie Gao
Graphene oxide (GO) nanosheets with unique structure have received much attention in providing opportunity for high-performance membranes in separation. However, the rational design of ultrathin graphene membranes with controlled structures remains a big challenge. Here, we report a methodology to synthesize dual metal-coordinated ultrathin nanoporous graphene nanofilms by tailoring well-aligned nanocrystals as building blocks on heteroatom-doped GO nanosheets with tunable architectures. Manipulation of metal nitrate as bifunctional dopants realizes N-doping of graphene oxide and preferential growth of α-Mn 2 O 3 nanocrystals. Generation of Mn-O-C bond during cross-linking greatly strengthens the stability of membranes for long-term steady operation. Meanwhile, because of spatial confinement effects and high binding energy, N-doped reduced GO nanosheets are desirable supports to construct numerous Mn-N-C bonds, thus generating artificial nanopores to significantly increase nanochannels for ultrafast mass transport. Moreover, the size-selective permeability of ultrathin nanoporous GO-based nanofilms can be optimized by managing the types of metal source for target coordination.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 11
·7566-7572
·
IF 1.354
Wu Weihua,Javaid Kashif,Liang Lingyan,Yu Jingjing,Liang Yu,Song Anran,Yao Meiyi,Lan Linfeng,Cao Hongtao
Aqueous solution induced method is regarded as a promising route to realize high-performance metal oxide thin film transistors at low temperature with an economical and environment friendly process. In this paper, we report the synthesis of multi-component AlO
x
:Y dielectrics
with a small amount of yttrium homogeneously distributed in AlO
x
matrix through an alternate spin-coating process. The AlO
x
:Y films demonstrate superior characteristics, such as improved surface morphology, better capacitance coupling effect, smaller dielectric
dispersion, and similar leakage current density compared to AlO
x
films of nearly twofold thickness. By elevating the pre-baking temperature, the dielectric performance of AlO
x
:Y films has been further optimized, exhibiting a near-atomically smooth surface,
a low current density of 8.2×10−8 A cm−2 at 2 MV/cm, and a dielectric constant of 7.4. And the corresponding thin-film transistor with amorphous InGaZnO channel shows a narrow working voltage range (<2.5 V), a field-effect mobility around 10
cm2 V−1 s−1, and an on/off current ratio exceeding 107 coupled with the gate current lower than 1 nA in the entire operation range.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Weiyi Su,Zhiwei Yang,Haoyang Wang,Jing Fang,Chunli Li,Gaojin Lyu,Hao Li
Replacing petrochemical polymers with biomaterials for biodegradable mulch applications has attracted widespread attention. However, improving film performance and reducing costs remain an issue. In this work, we found that the synergistic effect of sodium alginate and quaternary lignin significantly improved the performance and reduced the cost of poly(vinyl alcohol) films. The water retention, ultraviolet (UV) resistance, heat collection, light transmission, mechanical properties, soil consolidation, and the degradation rates of the composite films were systematically studied. We found that the addition of lignin enabled the film to achieve complete UV resistance, while the sodium alginate synergistically improved the mechanical and water-holding properties of the film. The film improved soil slumping, and the water vapor permeability of the film was 109.2 g·m–2·day–1. The degradation of the film was facilitated by the self-degradation properties of sodium alginate and lignin, which degraded 55% after 50 days.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）