Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 20
·12698-12705
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IF 10.733
Xulin Cui,Xiaoli Wu,Jie Zhang,Jingtao Wang,Haoqin Zhang,Fengguang Du,Lingbo Qu,Xingzhong Cao,Peng Zhang
Two-dimensional (2D) lamellar membranes with fast molecular transfer and precise sieving hold great promise for a wide range of separation applications. However, existing transfer channels are horizontally arrayed with long and tortuous in-plane paths, leading to high flow resistance and hence limited molecular permeance. Herein, we report a loosely stacked lamellar membrane with fastigiated channels using rigid and irregular molybdenum disulfide (MoS2) flakes as building blocks. Through filtration, MoS2 flakes stack in a disordered manner and construct hierarchical transfer channels: narrow gaps (∼1.8 nm) at the contacting edges of flakes and large cavities (∼8.3 nm) among stacked flakes. The large cavities work as low-barrier channels and result in ultrafast molecular permeation: over 1430 and 5000 L m−2 h−1 bar−1 for water and organics, respectively. However, the narrow gaps afford excellent dye rejection: over 90% for dyes with a size of above 1.9 nm. Dynamic simulation demonstrates that the flow resistance of fastigiated channels is much lower than that of horizontal channels. Furthermore, the corresponding model equation is established for describing molecular transfer in such channels. In addition, the membrane exhibits adequate structural stability under ultrasonication and acid or alkali environments, guaranteeing potential for long-term operation.
研究领域:
材料科学
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分离技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Xiaoli Wu,Shiyuan Liu,Xulin Cui,Jianlong Lin,Haoqin Zhang,Jie Zhang,Jingtao Wang
Lamellar membranes are promising for highly selective permeation, among which graphene-based ones are widely studied. However, graphene-based membranes give limited molecule permeance due to the unfavorable microenvironments of nanochannels, mainly single chemical affinity and narrow channel size. Herein, quantum dots (QDs) were introduced into nanochannels to manipulate the microenvironments for optimized performance. Particularly, hydrophobic graphene quantum dots were anchored in hydrophilic graphene oxide nanochannels to improve the affinity towards nonpolar molecules and locally enlarge the channel size from 0.84 to 1.35 nm. The pleasant affinity facilitates rapid dissolution and entry of molecules into nanochannels, and the enlarged channel size promotes their fast transport. This synergistic effect permits remarkably enhanced permeance for both polar and nonpolar molecules, especially for nonpolar ones. Meanwhile, the narrow distance at QD-free area effectively rejects dyes larger than 2.0 nm. Additionally, the strong covalent bonds between QDs and adjacent nanosheets bring superior stability for membranes.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
OPTICAL ENGINEERING
·
2012
·
IF 0.959
Hongyan Zhang,Xiaoyi Lv,Changwu Lv,Zhenhong Jia
Highly active and sensitive surface-enhanced Raman scattering (SERS) substrates were prepared by n -type (1 to 10 Ω⋅cm in resistivity) porous silicon (PS) substrates of Ag nanoparticles. SERS studies were carried on these substrates with R6G as a test molecule with a λ ex =785 nm laser. We optimized the fabrication procedure, which is easy and rapid, for nanostructured silver particles on the surface of PS. The maximum of SERS enhancement for R6G is observed for PS with an anodization current density of 6 mA/cm 2 and an etching time of 8 min. The detection limit for R6G absorbed on Ag-coated PS (Ag-PS) is 10 nM and SERS spectra show that the Ag-PS substrate has high SERS activity. The larger pore diameter of this new Ag-PS substrate is expected and the size of the pore diameter is about 1.2 μm, which permits better biomolecule infiltration. This new Ag-PS substrate can be applied in SERS in biochemical and biomedical fields.
研究领域:
材料科学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Fei Yan,Tao Luo,Qifan Jin,Huaxu Zhou,Ajabkhan Sailjoi,Guotao Dong,Jiyang Liu,Weizhong Tang
Herein we demonstrate a simple and rapid electrochemical method for selectively enhanced determination of catechol (CC) or hydroquinone (HQ) isomers in environmental water samples by tailoring the molecular permeability of vertically-ordered mesoporous silica-nanochannel films on electrochemically reduced graphene oxide (VMSF/ErGO). Such VMSF/ErGO composite film was fabricated on the gold electrode (AuE) surface using electrochemically assisted self-assembly approach. The as-prepared electrodes with surfactant micelles (SM) template inside silica nanochannels, designed as SM/VMSF/ErGO/AuE, possess hydrophobic hydrocarbon cores and show preferential response to CC via hydrophobic effect. After removing SM from silica nanochannels, the obtained VMSF/ErGO/AuE displays more sensitive response to HQ, which is due to the hydrogen bond effect between the silanol groups of silica walls and HQ. Given the potential-resolved and high electrocatalytic ability of ErGO, and molecular permeability and anti-fouling ability of VMSF, these two present sensors could detect CC and HQ in lake water with a low limit of detection (18 nM for CC and 16 nM for HQ), and a high sensitivity (0.33 μA/μM for CC and 0.37 μA/μM for HQ), without complicated sample pretreatment . Moreover, the proposed sensors provide a convenient, rapid and economic way for direct analysis of environmental water samples, exhibiting excellent long-term stability.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuqing Chai,Xuan Zhou,Gang Yuan,Wei Wang,Jingjing Zhang
ZIF-67-C 5 H 4 IN/MWCNT composites were successfully synthesized by doping 4-Iodopyridine (C 5 H 4 IN) and integrating multi-walled carbon nanotubes (MWCNT) IN cobalt dimethylimidazole (ZIF-67) via solvothermal and self-assembly methods. The composite was drop-cast on a glassy carbon electrode (GCE) for non-enzyme glucose detection IN alkaline media. The incorporation of C 5 H 4 IN modulated the three-dimensional metal-organic framework (MOF) structure of ZIF-67 and improved the molecular permeability, whereas the MWCNTs improved the electrical conductivity. As a result, the sensor offers excellent performance with a low limit of detection (LOD) of 0.78 μM, a linear range of 0.18–1.98 mM, and a sensitivity of 1033 μA mM −1 cm −2 . In addition, the sensor offers excellent stability, reproducibility and selectivity for common interferences.
研究领域:
分析化学
·
生物传感器
·
纳米材料
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Yi Gao,Mengyao Zhong,Jiajun Yu,Zhongming Zhao,Chaojie Yu,Qingyu Yu,Fanglian Yao,Junjie Li,Hong Zhang
Advancements in cell coculture systems with porous membranes have facilitated the simulation of human-like in vitro microenvironments for diverse biomedical applications. However, conventional Transwell membranes face limitations in low porosity (ca. 6%) and optical opacity due to their large thickness (ca. 10 μm). In this study, we demonstrated a one-step, large-scale fabrication of freestanding polymer ultrathin porous (PUP) membranes with thicknesses of hundreds of nanometers. PUP membranes were produced by using a gap-controlled bar-coating process combined with polymer blend phase separation. They are 20 times thinner than Transwell membranes, possessing 3-fold higher porosity and exhibiting high transparency. These membranes demonstrate outstanding molecular permeability and significantly reduce the cell–cell distance, thereby facilitating efficient signal exchange pathways between cells. This research enables the establishment of a cutting-edge in vitro cell coculture system, enhancing optical transparency, and streamlining the large-scale manufacturing of porous membranes.
研究领域:
生物医学工程
·
组织工程
·
细胞生物学
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）