MATERIALS & DESIGN
·
2023
·
IF 8.4
Yuhang Guo,Hong Wu,Shaoyun Guo,Jianhui Qiu
Bimodal pore structure design of separation membranes is a promising way to simultaneously improve permeability and selectivity. However, the thickness limitation of bimodal porous membranes is an obstacle to further improving the separation efficiency. In this study, a novel bimodal porous structure with uniform small pores on the surface and a unique laminated large pore structure in the thickness direction was successfully constructed through biaxial stretching of gel films in ultra-high molecular weight polyethylene membranes. With an increase in the draw ratio to 12 × 12, the uniformly refined small pores increased the rejection rate of the carbon nanoparticle solution (particle size distribution of 60–400 nm) to 99.4%, and the unique laminated large pore structure enabled the permeance to reach 1141.8 L m -2 h −1 bar −1 . By further increasing the draw ratio to 16 × 16, the membrane thickness decreased to 0.91 μm and the permeance was further increased to 2008.2 L m -2 h −1 bar −1 while the selectivity slightly decreased to 98.9%. Furthermore, a bimodal porous membrane with sufficient strength (237 MPa of 16 × 16) was efficient for long-term water separation. This study proposes a new design idea for ultrathin porous membranes, which can be further expanded to prepare various antifouling, self-cleaning, and multifunctional separation membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 1
·017901
·
IF 1.7
Siwen You,Ziyi Shao,Xiao Guo,Junjie Jiang,Jinxin Liu,Kai Wang,Mingjun Li,Fangping Ouyang,Chuyun Deng,Fei Song,Jiatao Sun,Han Huang
Hybrid organic–inorganic perovskite thin films have attracted much attention in optoelectronic and information fields because of their intriguing properties. Due to quantum confinement effects, ultrathin films in nm scale usually show special properties. Here, we report on the growth of methylammonium lead iodide (MAPbI3) ultrathin films via co-deposition of PbI2 and CH3NH3I (MAI) on chemical-vapor-deposition-grown monolayer MoS2 as well as the corresponding photoluminescence (PL) properties at different growing stages. Atomic force microscopy and scanning electron microscopy measurements reveal the MoS2 tuned growth of MAPbI3 in a Stranski–Krastanov mode. PL and Kelvin probe force microscopy results confirm that MAPbI3/MoS2 heterostructures have a type-II energy level alignment at the interface. Temperaturedependent PL measurements on layered MAPbI3 (at the initial stage) and on MAPbI3 crystals in averaged size of 500 nm (at the later stage) show rather different temperature dependence as well as the phase transitions from tetragonal to orthorhombic at 120 and 150 K, respectively. Our findings are useful in fabricating MAPbI3/transition-metal dichalcogenide based innovative devices for wider optoelectronic applications.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 48
·2307013
·
IF 29.4
Caijiao Yu,Xixi Cen,Zhengqing Zhang,Yuxiu Sun,Wenjuan Xue,Zhihua Qiao,Michael D. Guiver,Chongli Zhong
Ultrathin membranes with ultrahigh permeance and good gas selectivity have the potential to greatly decrease separation process costs, but it requires the practical preparation of large area membranes for implementation. Metal–organic frameworks (MOFs) are very attractive for membrane gas separation applications. However, to date, the largest MOF membrane area reported in the literature is only about 100 cm 2 . In the present study, a new step-nucleation in situ self-repair strategy is proposed that enables the preparation of large-area (2400 cm 2 ) ultrathin and rollable MOF membranes deposited on an inexpensive flexible polymer membrane support layer for the first time, combining a polyvinyl alcohol (PVA)‒metal-ion layer and a pure metal-ion layer. The main role of the pure metal-ion layer is to act as the main nucleation sites for MOF membrane growth, while the PVA‒metal-ion layer acts as a slow-release metal-ion source, which supplements MOF crystal nucleation to repair any defects occurring. Membrane modules are necessary components for membrane applications, and spiral-wound modules are among the most common module formats that are widely applied in gas separation. A 4800 cm 2 spiral-wound membrane module was successfully prepared, demonstrating the practical implementation of large-area MOF membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Mengfan Wang,Shao-Lu Li,Youcai Chen,Qiyu Duan,Dandan Cheng,Genghao Gong,Yunxia Hu
The integration of high permeability and exceptional selectivity, thereby overcoming the conventional “trade-off” effect, remains a persistent challenge for the practical implementation of organic solvent nanofiltration (OSN) membranes. Herein, at the molecular level of design, we utilized the 5,5′-diamino-2,2′-biphenol (amino-BIPOL) and diacyl chloride as IP monomers to prepare OSN membranes with high perm-selectivity. The amino-BIPOL, a contorted biphenol molecule with four reactive sites, serves as a molecular-level unit to hinder efficient packing of polymer chains and induce the formation of interconnected micropores in the resulting polyesteramide layers. By employing diacyl chloride terephthaloyl dichloride (TPC) and isophthaloyl dichloride (IPC) as the oil-phase cross-linker, two kinds of TFC membranes were prepared. The resulting membranes both present smooth surface morphology, with ultrathin and high microporous selective layer allowing for efficient mass transfer. Specifically, the methanol permeance of amino-BIPOL/TPC and amino-BIPOL/IPC membrane reaches up to 15.1 and 15.6 LMH/bar, while maintaining a molecular weight cut-off (MWCO) value of 300 and 373 Da, respectively. Overall, this work illustrates the different oil-phase cross-linkers will result in diverse nanofilm microstructure and thus with distinct perm-selectivity properties, offering new insights for the design and modification of advanced OSN 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
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Jiangying Liu,Yang Pan,Jingyi Xu,Zhenggang Wang,Haipeng Zhu,Gongping Liu,Jing Zhong,Wanqin Jin
Pebax-based membranes have attracted intensive interest for high separation efficacy of carbon dioxide . For achieving excellent gas permeance, ultrathin membrane thickness is always the pursuit of composite membrane technology, in which controlling the interfacial property of the multi-layer remain a great challenge. Herein, we introduced an amphipathic copolymer polydimethylsiloxane (PDMS)-block-polyethylene oxide (PEO) (PDMS- b -PEO) into the intermediate layer to tune the interfacial adhesion, enabling fabrication of ultra-thin Pebax composite membrane. It was demonstrated that surface segregation of PEO segments not only suppressed formation of dense SiO x layer due to the plasma treatment on PDMS intermediate layer, but also provided extra hydrophilic sites and interfacial compatibility for subsequent Pebax selective layer coating. With the present of PDMS- b -PEO in the intermediate layer, an integrated Pebax selective layer with thickness of ∼50 nm was successfully fabricated. The resulting ultra-thin Pebax composite membrane exhibited outstanding performance with CO 2 permeance of 2142 GPU and CO 2 /N 2 selectivity of 36. The strategy of using amphipathic copolymer as intermediate layer enhanced the composite membrane integrity and simplified the plasma pre-treatment, showing great potential in developing highly permeable membrane for efficient CO 2 capture.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Qian Yang,Xingyu Lin,Bin Su
An ideal molecular filtration membranes should be highly permeable and selective, thus desiring the membranes to be ultrathin, be highly porous, and consists of small and uniform pores or channels. In this work, we report the molecular filtration by free-standing ultrathin silica nanochannel membranes (SNMs) using a U-shaped cell and spectrophotometric detection, focusing on the quantitative evaluation of permeability and selectivity of SNMs. Thanks to the ultrasmall channel size, namely, ∼2–3 nm, and the negatively charged channel surface arising from the deprotonation of silanol groups, the SNM displayed excellent size and charge selectivity for molecular filtration. The selectivity coefficient for separation of small methyl viologen from large cytochrome c is as high as 273, because of the uniform pore/channel size. The charge-based filtration can be modulated by the salt concentration and solution pH, which control the overlap of radial electrical double layer and surface charge sign/density, respectively. Owing to the high relative pore density, namely, 16.7%, and the straight and vertical channel orientation, the SNM is highly permeable, displaying a molecule flux much higher than commercially available dialysis membrane and others reported previously. In addition, we demonstrated that, by biasing a small voltage across the SNM, both the flux and separation selectivity could be significantly enhanced.
研究领域:
材料科学
·
化学工程
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 44
·17948-17955
·
IF 4.177
Farooq Khurum Shehzad,Ningning Qu,Yunshan Zhou,Lijuan Zhang,Huanyao Ji,Zonghai Shi,Jiaqi Li,Sadaf ul Hassan
Composite films with the general formula (POM/CuTAPc)n derived from water-soluble Keggin-type polyoxometalates (POMs = H5PMo10V2O40, H4SiW12O40, H3PMo12O40 and H3PW12O40) and water-insoluble 4,9,16,23-copper tetraaminophthalocyanine (denoted CuTAPc) are successfully fabricated by a layer-by-layer self-assembly technique and systematically characterized. The structure of the polyoxometalate anions in the multilayers is kept intact; the deposition amounts of POM and CuTAPc remain constant in every adsorption cycle of the composite film assembly process. The nonlinear optical properties of the composite films were studied by a Z-scan technique at a wavelength of 532 nm and a pulse width of 7 ns. The results not only show that the composite films exhibit notable optical nonlinear self-defocusing behavior and a saturated absorption effect with the nonlinear optical absorption co-efficient β, refractive index n2, and third-order NLO susceptibility χ(3) of the films increasing with the increase in number of layers of the films, but also reveal importantly that the discrepancy of LUMO levels between CuTAPc and POMs is proportional to their third-order NLO response.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 40
·16737-16743
·
IF 7.394
Zhixiong Li,Ruizheng Liang,Wendi Liu,Dongpeng Yan,Min Wei
Stimuli-responsive fluorescent switches have shown broad applications in optical devices, biological materials and intelligent responses. Herein, we describe the design and fabrication of a dual-stimuli-responsive fluorescent switch ultrathin film (UTF) via a three-step layer-by-layer (LBL) technique: (i) encapsulation of spiropyran (SP) within an amphiphilic block copolymer (PTBEM) to give the (SP@PTBEM) micelle; (ii) the mixture of riboflavin (Rf) and poly(styrene 4-sulfonate) (PSS) to enhance the adhesion ability of small molecules; (iii) assembly of negatively charged SP@PTBEM and Rf–PSS with cationic layered double hydroxide (LDH) nanoplatelets to obtain the (Rf–PSS/LDH/SP@PTBEM)n UTFs (n: bilayer number). The assembly process of the UTFs and their luminescence properties, as monitored by fluorescence spectroscopy and scanning electron microscopy (SEM), present a uniform and ordered layered structure with stepwise growth. The resulting Rf–PSS/LDH/SP@PTBEM UTF serves as a three-state switchable multicolor (green, yellow, and red) luminescent system based on stimulation from UV/Vis light and pH, with an acceptable reversibility. Therefore, this work provides a facile way to fabricate stimuli-responsive solid-state film switches with tunable-color luminescence, which have potential applications in the areas of displays, sensors, and rewritable optical memory and fluorescent logic devices.
研究领域:
材料科学
·
光学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
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
Cell Reports Physical Science
·
2022
·
IF 7.832
Yu Zhang,Xin Li,Lishuang Fan,Yong Shuai,Naiqing Zhang
Rechargeable aqueous zinc-ion batteries have emerged as potential alternatives to lithium-ion batteries in grid energy storage due to their intrinsic safety, economy, and high capacity of zinc anode. Unfortunately, dendrite growth, limited reversibility, and corrosion of metal zinc anodes in aqueous systems seriously hamper the application of zinc-ion batteries. Herein, ultrathin and high-toughness membranes composed of eco-friendly biomass nanofibers are constructed for substituting glass-fiber separators in rechargeable zinc-ion batteries. The presence of this robust biomass membrane lowers separator thickness to 9 μm, which can prevent the pierce of zinc dendrite, manipulate crystallographic orientation during zinc deposition, and improve the anti-corrosion property of zinc. Thus, this robust biomass membrane enables excellent electrochemical performance and sheds light on a multifunctional design for improving metal zinc anode performance from separators beyond zinc itself.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Jiangdong Dai,Lulu Yu,Jie Liu,Lulu Wang,Junda Wu,Ruilong Zhang,Li Chen,Xiaohua Tian,Xiaohui Dai,Jianming Pan
Superwetting membranes have considerable potentials in the field of water treatment, especially for oil-water separation, however it still keeps great challenges to prepare ones with high mechanical property and strong interfacial cohesion strength . Herein, inspired by high hardness yet toughness of natural nacre , we proposed a polyphenol-mediated inner-outer through type modification strategy to fabricate ultrathin coordination-crosslinked nacre-inspired hydrogel superwetting membranes (named PVDF/GPT/Fe), using 2D graphene oxide (GO) nanosheets , flexible polyvinyl alcohol (PVA) and branched structure tannic acid (TA) as the assembly units, and Fe 3+ ion as the cross-linking agent. It is found that PVA-TA interface assembly is key to realize the inner-outer through type hydrophilic modification for the hydrophobic PVDF membrane, to achieve superhydrophilicity and underwater superoleophobicity with the UOCAs of above 150°, ultra-low oil-adhesion and self-cleaning property, with a high flux recovery ratio of 96.3 % after six cycles. The PVDF/GPT/Fe membrane exhibits the boosted mechanical strength and damage resistance, with the Young's modulus of up to 1076 MPa, which is enhanced by 4.4 times, compared to the pristine PVDF membrane, benefiting from the formation of the layered brick-and-mortar structured nacre-inspired hydrogel coating and strong bonding strength of the interfaces between the base membrane and the top coating layer. The separation efficiencies of the PVDF/GPT/Fe membrane for various oil-in-water emulsions are higher than 99.5 % and the largest emulsion permeance is 611.2 L m-2 h-1 bar-1. Our research extends the path route to design and manufacture novel biomimetic superwetting membranes with high mechanical strength and durability.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanqing Qu,Yang Liu,Hongge Jia,Shuangping Xu,Mingyu Zhang,Tianyuan Xiao,Xiaoyu Du
Three-dimensional covalent organic frameworks (3D COFs) have garnered considerable attention in the adsorption of small molecules owing to their unique 3D pore structure and easily modifiable functional group sites. However, most 3D COFs exhibit lattice interpenetration, making the membrane fabrication process difficult. Most 3D COFs are prepared as powders using solvothermal methods, which severely limits their application in material separation. Therefore, self-supporting 3D COFs membranes were fabricated using room-temperature interfacial polymerization, a low-energy method. Traditional alkane/water interfacial polymerization methods have disadvantages such as poor water solubility of the monomer, volatile solvents, and low crystallinity. Herein, an imine-linked, self-standing, 3D COFs membrane with an ultrathin layer was engineered at the alkane/ionic liquid interface . Owing to the improved crystalline structure, which exposed a large number of imine-linked sites within a 3D pore channel, the constructed 3D COFs membrane exhibited a high Brunauer–Emmett–Teller surface area of 1061.4 m 2 ·g −1 and high water flux of approximately 76 L·m −2 h −1 bar −1 and demonstrated excellent rejection rates of 97.76% and 95.36% for two cationic dyes, rhodamine B and methylene blue, respectively. The membrane exhibited high rejection rates after seven testing cycles. This study reveals the great potential of self-standing 3D COFs membranes as dye separation.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 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）