SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Liang-Chih Ma,Leyu Shen,Yanzong Meng,Jerry Y.S. Lin
Nanoporous Torlon® hollow fiber membranes provide a robust platform for versatile separation applications. Conventional fabrication methods, such as additive-assisted or multi-step post-treatment approaches, often face a trade-off between surface pore size and effective surface porosity, as well as increased solvent use and processing complexity. Here, we developed a one-step, additive-free air-gap spinning process using N -methyl-2-pyrrolidone (NMP)/H₂O bore fluids (60–90 wt% NMP) and air-gap distances of 5–80 cm under controlled 25 °C and 30 % RH conditions. At a 5 cm air gap, higher NMP content increased inner-surface porosity, while at 90 wt% NMP, gas transport was governed by an outer-selective Knudsen flow skin (mean pore diameter 4.6 nm). Longer air gaps required lower NMP contents (≤65 wt%) for spinning stability. For fibers spun with 65 wt% NMP, mean pore diameter decreased from 3.0 to 2.1 nm as the air-gap distance increased, attributed to gravity-induced elongational stress. Gas permeance was primarily controlled by effective surface porosity, showing an optimum at 40 cm due to the trade-off between enhanced inner-surface porosity and bulk densification. Mechanical strength remained consistent, while Young's modulus improved with higher draw ratios due to polymer chain orientation. This simplified fabrication route eliminates pore-forming additives and post-treatment steps, reduces solvent use, yields debris-free inner surfaces, and preserves the thermal stability of nanoporous Torlon® hollow fibers for advanced separation applications.
研究领域:
材料科学
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膜技术
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分离过程
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高分子工程
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化学工程
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 14
·期 21
·7408-7414
·
IF 3.842
Hao Wei,Shangzhi Chen,Xinglong Ren,Bingjian Qian,Yanjie Su,Zhi Yang,Yafei Zhang
We have reported that the Sn-doped PbSe nanocrystals could be synthesized via a facile solution-based method. Structural and optical characterizations were employed to investigate the properties of the nanocrystals. The x value could be altered across the entire range from 0.58 to 1 by modulating the ratio of cation precursor contents. The band gap energy of the Sn-doped PbSe nanocrystals could be tuned and changed in a nearly linearly way with respect to the x value. Furthermore, using oleylamine as the solvent promoted the nanocrystals to self-assemble as nano-flowers. The theoretical analysis based on first-principles calculations and density of states (DOS) in the VASP code demonstrates the validity of the experimentally obtained band gap variation and values. The band gap energy values at the edge of the solar spectrum render them as competitive candidates for solar applications.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 20
·6919-6927
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IF 6.1
Hongshan Wang,Xueting Pan,Shilie Pan,Junjie Li
Rare-earth (RE) compounds show wide applications in advanced photoelectric functional materials. Herein, by introducing [AgS3] trihedral and [NaQ6] (Q = S, Se) octahedral units into the AIREIIICIVQVI4 family for the first time, four new RE-based chalcogenides AIREIIISiQVI4 (AI = Ag, Na; REIII = La, Y; QVI = S, Se) were designed and successfully synthesized. With the increase of atomic radius from Ag, Li, Na, K, to Rb and Cs, the compounds show evident structural transitions from Ama2 (LiLaSiS4), P21/c (AgLaSiS4, NaLaSiS4), and P21 (KLaSiS4) to Pnma (RbLaSiS4, CsLaSiS4), highlighting that chemical modulations including atomic radius, coordination and bond length co-affected the structure transition. The title compounds exhibit wide band gaps (3.33 and 3.18 eV for AgLaSiS4 and AgYSiS4; 3.83 and 3.02 eV (HSE06) for NaLaSiS4 and NaLaSiSe4, respectively) that are higher than the Ag- and RE-based chalcogenides, as well as strong optical anisotropies (Δncal = 0.114–0.160@1064 nm). The theoretical calculations confirm the charge transfer enhanced band gap mechanism in the compounds and demonstrate that the layer distance influenced birefringence. The results enrich the chemical and structural diversity of RE compounds in the AIREIIICIVQVI4 family and give new insights into the design of new RE-based compounds with wide band gaps and large birefringence.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yueling Xu,Qi Fu,Shuijin Lei,Lixiang Lai,Jinsong Xiong,Qinghuan Bian,Yanhe Xiao,Baochang Cheng
As the typical multifunctional materials, multinary metal chalcogenides have attracted tremendous attention due to their broad applications. In this work, quinary chalcogenide CuNi x Zn 2− x InS 4 ( x = 0–2) nanocrystals with a wurtzite structure have been successfully synthesized for the first time by a solution method. The phase structure analysis suggests that the fabricated wurtzite phase has a disordered structure in which all metal cations share the same position and have a random distribution in the unit cell. The transmission electron microscopy results reveal that the products show a morphological evolution from sphere-like nanocrystals of CuZn 2 InS 4 ( x = 0) to bullet-like nanocrystals of CuNi 2 InS 4 ( x = 2) together with a growing particle size. All the as-obtained wurtzite CuNi x Zn 2− x InS 4 nanocrystals show a strong and broad visible light absorption. More importantly, the band gap energy of these nanocrystals can be readily tuned from 2.20 eV to 1.44 eV by varying the value of x from 0 to 2, which decreases almost linearly with the composition x . This work demonstrates a new series of I–II 2 –III–VI 4 group chalcogenide semiconductors.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 17
·5861
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IF 3.748
Haifeng Zhu,Renjie Ding,Xinle Dou,Jiashun Zhou,Huihua Luo,Lijie Duan,Yaping Zhang,Lianqing Yu
A novel co-catalyst system under visible-light irradiation was constructed using high-purity metal and alloy mesh and a Mn0.5Cd0.5S photocatalyst with a narrow band gap (1.91 eV) prepared by hydrothermal synthesis. The hydrogen production rate of Mn0.5Cd0.5S changed from 2.21 to 6.63 mmol·(g·h)−1with the amount of thioacetamide, which was used as the sulphur source. The introduction of Ag, Mo, Ni, Cu, and Cu–Ni alloy meshes efficiently improved the H2production rate of the co-catalyst system, especially for the Ni mesh. The improvement can reach an approximately six times greater production, with the highest H2production rate being 37.65 mmol·(g·h)−1. The results showed that some bulk non-noble metal meshes can act as good or better than some noble metal nanoparticles deposited on the main photocatalyst for H2evolution due to the promotion of photoinduced electron transfer, increase in redox reaction sites, and prevention of the recombination of carriers.Keywords:co-catalyst system;Mn0.5Cd0.5S;metal and alloy mesh;H2evolution;photoinduced electron transfer
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 12
·2203519
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IF 27.8
Huijun Liao,Zizhen Zhou,Sikang Zheng,Yuling Huang,Guang Han,Guoyu Wang,Zhengyong Huang,Xu Lu,Jian Li,Xiaoyuan Zhou
High-temperature thermoelectric (TE) materials are common wide-gap semiconductors that are used in order to prevent the bipolar effect. Here, a potential high-temperature n -type TE material SmS with a simple NaCl structure that demonstrates a narrow band gap of ≈0.25 eV is reported. As expected, a temperature-dependent carrier concertation is observed, which is attributed to the thermal activation of electrons from valence band edge to conduction band. Interestingly, the intrinsic activation does not cause any sign of a bipolar effect. Density functional theory calculations suggest that the phenomenon originates from the strong electron-hole asymmetry in the electronic structure and the electron-to-hole conductivity ratio is as high as 700–900. As a result, the activated minority carriers barely participate in the TE transport and the maximum power factor reaches 1.41 mW K −2 m −1 at 1123 K. By further alloying with Se to reduce lattice thermal conductivity, a peak zT of ≈1.1 is obtained in Sm 1.08 S 0.78 Se 0.22 at 1123 K, which is among the best n -type high-temperature thermoelectrics. This study proves high-temperature TE materials can be found in narrow-gap semiconductors, which significantly enriches the scope of possibilities for novel TE materials.
研究领域:
材料科学
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凝聚态物理
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
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2024
·
IF 27.4
Wen Li,Qi-Wen Chen,Jin-Xuan Fan,Zi-Yi Han,Wen-Fang Song,Xuan Zeng,Xian-Zheng Zhang
Due to inherent differences in cellular composition and metabolic behavior with host cells, tumor-harbored bacteria can discriminatorily affect tumor immune landscape. However, the mechanisms by which intracellular bacteria affect antigen presentation process between tumor cells and antigen-presenting cells (APCs) are largely unknown. The invasion behavior of attenuated Salmonella VNP20009 (VNP) into tumor cells is investigated and an attempt is made to modulate this behavior by modifying positively charged polymers on the surface of VNP. It is found that non-toxic chitosan oligosaccharide (COS) modified VNP (VNP@COS) bolsters the formation of gap junction between tumor cells and APCs by enhancing the ability of VNP to infect tumor cells. On this basis, a bacterial biohybrid is designed to promote in situ antigen cross-presentation through intracellular bacteria induced gap junction. This bacterial biohybrid also enhances the expression of major histocompatibility complex class I molecules on the surface of tumor cells through the incorporation of Mdivi-1 coupled with VNP@COS. This strategic integration serves to heighten the immunogenic exposure of tumor antigens; while, preserving the cytotoxic potency of T cells. A strategy is proposed to precisely controlling the function and local effects of microorganisms within tumors.
研究领域:
癌症生物学
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免疫学
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生物技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Yanchun Yang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
Alkali metal doping plays a crucial role in fabricating high-performance Cu(In,Ga)(S,Se)2 and Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells. In this study, we report the first experimental observation and characterizations of the alloyed LixCu2–xZnSn(S,Se)4 thin films. It is found that Cu+ ions in Cu2ZnSn(S,Se)4 thin films can be substituted with Li+ ions, forming homogeneous LixCu2–xZnSn(S,Se)4 (0 ≤ x ≤ 0.29) alloyed thin films. Consequently, the band gap, conduction band minimum, and valence band maximum of LixCu2–xZnSn(S,Se)4 thin films are profoundly affected by Li/Cu ratios. The band alignment at the LixCu2–xZnSn(S,Se)4/CdS interface can be tuned by changing the Li/Cu ratio. We found that the photovoltaic parameters of the LixCu2–xZnSn(S,Se)4 solar cell devices are strongly influenced by the Li/Cu ratios. Besides, the lattice constant, carrier concentration, and crystal growth of LixCu2–xZnSn(S,Se)4 thin films were studied in detail.
研究领域:
材料科学
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太阳能技术
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半导体物理
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2025
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IF 5.5
Binghuan Li,Cong Liu,Haojie Li,Jing Wang,Anwen Gong,Jiexi Yang,Kai Chen,Yonggang Min,Tao Liu,Qifan Xue,Bingsuo Zou,Xiaotian Hu
Comprehensive Summary High quality light-absorbing layers with matched band gaps of sub-cells are crucial for achieving high power conversion efficiency (PCE) in the perovskite/organic tandem solar cells (PO-TSCs). In this work, we systematically optimized the band gaps of wide-bandgap perovskite layer (1.73–1.85 eV) and narrow-bandgap organic active layer (1.34–1.38 eV). An asymmetric small-molecule acceptor, namely SY2 (two F atoms and two Cl atoms), is introduced into the PM6:BTP-eC9 blend to enhance the light absorption, form the fibril network morphology, and facilitate exciton dissociation and transport. By precisely integrating a 1.80 eV perovskite sub-cell and a 1.34 eV ternary organic sub-cell, we achieved a champion PCE of 25.47% for the PO-TSCs based on the well-matched short-circuit current density. Besides, the optimized devices exhibited outstanding long-term stability. Our findings highlight the importance of band gap matching between front and near sub-cells in reducing recombination loss for high-performance tandem solar cells.
研究领域:
光伏学
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材料科学
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可再生能源
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半导体物理
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有机电子学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.9
Huaiqiang Xun,Shumei Cao,Qingyue Cui,Yi Feng,Rui Wu,Chunmei Huang,Leyan Nian
Two new bismuth oxychlorides provide a direct 2D-versus-3D structural comparison. • Layered LiBi 2 O 3 Cl combines Δ n = 0.18 at 1064 nm with a 298 nm UV cutoff edge. • Halogen regulation of framework dimensionality tunes optical anisotropy in Bi 3+ crystals. Birefringent crystals are indispensable for manipulating light polarization in advanced optical communication and laser systems. The quest for materials that combine a large birefringence (Δ n ) with a suitable ultraviolet (UV) cutoff edge remains a central challenge. Herein, two new bismuth oxychloride birefringent crystals, LiBi 2 O 3 Cl and Li 2 BiO 2 Cl, were successfully synthesized via a high-temperature melt method. Single-crystal structure determination reveals that LiBi 2 O 3 Cl crystallizes in a two-dimensional (2D) layered motif, whereas Li 2 BiO 2 Cl adopts a three-dimensional (3D) network. The 2D layered compound exhibits a larger calculated birefringence of 0.18 at 546 nm, a short UV cutoff edge of 298 nm, and a remarkable thermal stability up to 746 °C without decomposition, surpassing the corresponding properties of many reported bismuthates. First-principles density functional theory calculations attribute the large optical anisotropy to the cooperative effects of the stereochemically active lone pairs of Bi 3+ cations and the preferential alignment of distorted [BiO 4 ] units within the 2D layers. This work provides a promising UV birefringent candidate and demonstrates halogen regulation of framework dimensionality as an effective design approach for lone-pair-containing optical crystals. Download: Download high-res image (211KB) Download: Download full-size image
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yue Sun,Xueying Zhang,Jiayu Li,Xiaodong Li,Lu Liu,Kouadio Jean Eric-Parfait Kouame
We hypothesized that improving the fat globule structure of infant formulae based on the milk fat globule membrane (MFGM) would regulate metabolites and metabolic pathways, making it more similar to the metabolic properties of human milk. Therefore, we prepared infant formulae with different fat globule structures, including two model infant formulae (F1: fat globules surrounded by MFGM; F2: fat globules surrounded by protein) and one commercial infant formulae containing MFGM, and compared their metabolic differences with those of human milk. The number of differential metabolites between each sample and human milk reached 60 (F1), 132 (F2) and 126 (IF1). Glycerophosphocholines were screened as potential biomarkers to distinguish infant formulae from human milk. Compared with F2 and IF1, the enrichment of amino acid metabolism and lipid metabolism pathways was not significant between F1 and human milk. These results emphasized that F1 had the highest similarity to human milk in metabolic properties.
研究领域:
营养学
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生物化学
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DOI
PubMed
高影响因子
Small
·
2023
·Vol. 20
·期 21
·2309626
·
IF 13.3
Boyu Xu,Dan Guo,Weikang Dong,Huiying Gao,Peng Zhu,Zhiwei Wang,Kenji Watanabe,Takashi Taniguchi,Zhaochu Luo,Fawei Zheng,Shoujun Zheng,Jiadong Zhou
Floating gate memory (FGM), composed of van der Waals (vdW) junctions with an atomically thin floating layer for charge storage, is widely employed to develop logic-in memories and in-sensor computing devices. Most research efforts of FGM are spent on achieving long-term charge storage and fast reading/writing for flash and random-access memory. However, dynamic modulation of memory time via a tunneling barrier and vdW interfaces, which is critical for synaptic computing and machine vision, is still lacking. Here, a van der Waals short-term memory with tunable memory windows and retention times from milliseconds to thousands of seconds is reported, which is approximately exponentially proportional to the thickness h-BN (hexagonal boron nitride) barrier. The specific h-BN barrier with fruitful gap states provides charge release channels for trapped charges, making the vdW device switchable between positive photoconductance and negative photoconductance with a broadband light from IR to UV range. The dynamic short-term memory with tunable photo response highlights the design strategy of novel vdW memory vis interface engineering for further intelligent information storage and optoelectronic detection.
研究领域:
材料科学
·
电子工程
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）