JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yucai Li,Can Deng,Haotian Hu,Yida Wang,Zijian Qi,Cong Chen,Cailong Zhou,Liang Shen
Polyamide thin-film composite (PA TFC) membranes synthesized via conventional interfacial polymerization (IP) often underperform in Cl − /SO 4 2− separation due to their subpar spatial architectures. This study presents a novel strategy to fabricate advanced anion-selective nanofiltration (NF) membranes by functionalizing PA selective layer pore walls with nitrogen/oxygen-containing heterocyclic compounds (crown ether and cyclen) to tailor intrapore chemical microenvironments. Both experimental validations and molecular simulation results demonstrate that precise regulation of chemical interactions between the membrane matrix and permeation species (NaCl/Na 2 SO 4 ) enables controlled tuning of diffusion energy barriers for anions traversing the membrane. Beyond size exclusion and charge repulsion mechanisms, we employ transition state theory to elucidate the fundamental Cl − /SO 4 2− separation mechanism. The distinct roles of these compounds in modulating IP reaction kinetics and their impacts on membrane microstructure are systematically investigated. Integration of heterocycles into the PA network yields more hydrophilic, less densely packed membranes. Resultant cyclen-modified membranes achieve exceptional separation performance (water flux of 26.65 L m −2 h −1 bar −1 , Cl − /SO 4 2− selectivity of 223), while 15-crown-5-modified membranes exhibit remarkable Cl − /SO 4 2− selectivity (690, Na 2 SO 4 rejection of 99.71 %) with maintained water flux (17.50 L m −2 h −1 bar −1 ). These modified membranes also exhibit robust long-term stability and excellent fouling resistance. This work establishes a novel pathway for developing high-performance Cl − /SO 4 2− separation membranes through engineered control of ion diffusion energy barrier.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lingyao Zou,Lu Gan,Wenli Song,Chunying Rong,Lishan Yang,Liping Yu,Zhongyun Ma,Shixun Lian
The rapid development of highly durable electric vehicles has put forward higher requirements for lithium-ion batteries. Li 4 Ti 5 O 12 (LTO) is widely studied owing to its long service life and safety. However, owing to their low electrical conductivity and diffusion, lithium ions have limited practical applications. In this study, Co-Cl co-doped LTO/TiO 2 diphase (LTOT) nanosheets were prepared via the hydrothermal method . The synergistic effect of Co-Cl co-doping reduced the charge-transfer resistance of LTOT and increased the lithium-ion diffusion coefficient , thereby improving the dynamic behavior of the electrode material, which further enhances the rate capability and cycle performance of LTOT. The optimized LTOT:Co-Cl composite exhibited excellent cycle performance and rate capability (the ninth cycle reversible capacities were 253.8, 222.2, 200.1, 185.7, 169.9, 161.3, and 146.3 mAh·g −1 at the current density of 1, 2, 5, 10, 20, 30, and 50 C (1 C = 175 mA·g −1 ) rate, respectively). In addition, LTOT:Co-Cl maintained a capacity of 120 mAh·g −1 after 5000 cycles at 50 C with a retention rate of 83 %, indicating that the average decay rate per cycle is only 0.003 % during the long charge/discharge process.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hongyuan Zhao,Youchao Wei,Yameng Chen,Caiping Liu,Feilong Jiang,Yongsheng Liu,Maochun Hong
All-inorganic Pb-free halide perovskites have recently received extensive attention due to their unique structures and optoelectronic properties. However, the realization of pure-blue emitting perovskite nanocrystals (NCs) with satisfactory stability and rational interpretation for their corresponding self-trapped excitons (STEs) emissions remains an arduous task. Herein, a modified hot-injection method is proposed to prepare a new family of zero-dimensional (0D) Cs 3 ZnX 5 (X = Cl, Br) perovskite NCs with pure-blue and sky-blue photoluminescence (PL) emissions. Benefitting from the 0D tetragonal-phase structure, the Cs 3 ZnX 5 NCs possess outstanding long-term stability in ambient air conditions. We employ the experimental results and first-principles calculations to confirm that the blue STEs emission of Cs 3 ZnX 5 NCs is dominated by the halide vacancies (V X ) in [ZnX 4 ] 2- tetrahedra. Our findings not only provide a simple and valid method to control the synthesis of blue-emitting 0D Zn-based perovskite NCs, but also clarify their underlying PL mechanism.
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Coatings
·
2022
·Vol. 12
·期 4
·464
·
IF 3.236
Wei Wang,Liping Shi,Chengcheng Wu,Qi Pan,Hua Fang,Jianwei Jiang,Xueyong Guo
In order to reduce the mechanical sensitivity of ε-CL-20, wax and fluororubber polymers were used as coating materials and desensitizers to coat ε-CL-20 by the water suspension method. Through molecular dynamics calculations, fluorine rubber F2311, which had a good combination with ε-CL-20, was selected as the coating material and then ε-CL-20-based composite particles with double-layer structure were prepared. The contact angles of water, glycerin and diiodomethane as the testing liquids on the surface of F2311and wax were measured by a contact angle measuring instrument, and the thermodynamic parameters of ε-CL-20/F2311and the ε-CL-20/wax interface were calculated. ε-CL-20 before and after coating was characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and the mechanical sensitivity analytical method. The results showed that F2311/wax had uniformly passivated on the surface of ε-CL-20, forming a dense and uniform protective film, and the CL-20 crystal form did not change after coating. The double-layer composite structure effectively reduces the sensitivity of ε-CL-20 and improves the thermal stability of ε-CL-20.Keywords:ε-CL-20;F2311/wax;mechanical sensitivity
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jun Cai,Yibing Xie,Chong Ma,Xueqian Wang,Langlang Wang,Ping Ning,Yixing Ma
Photocatalytic oxidation of gaseous heavy metals is an efficient approach to alleviate energy crises and environmental pollution. In this study, a novel two-step solvothermal method was designed to synthesize reduced graphene oxide (rGO)-modified bismuth oxyhalide (BiOX, X = Cl, I, Br) nanosheets. The modification of rGO led to the significant enhancement in the specific surface area of BiOX nanosheets, reduction in the bandgap, improvements in the light absorption range and intensity, acceleration in the photogenerated carrier separation rate, and reduction in the photogenerated electron − hole complexation. Furthermore, both O 2 – and OH were demonstrated to be active species in the reaction. Owing to these achievements, all samples displayed significantly improved photocatalytic performance. Furthermore, the rGO-modified samples exhibited excellent stability and maintained the highest mercury removal efficiency after several cycles. However, the samples prepared in this research displayed a high level of moisture resistance. These characteristics of BiOX-based materials make them potential candidates for the photocatalytic removal of heavy metals from industrial waste gases.
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POLYMER
·
2022
·
IF 4.432
Junping Lv,Lin Zhu,Meng Zhang,Zexu Zhao,Shu-Wei Chen,Jinyi Wang
Actuators with controllable and reversible morphing towards environment stimuli have great potential applications in diverse fields. In spite of good progress made over the past decades, simple and efficient preparation of multi-response actuators is still a challenge. Here, we report a strategy to prepare humidity and near infrared (NIR) dual-response actuators with controllable and reversible bending or twisting deformation. The actuators were made up of two layers, one was polyvinyl butyral (PVB) layer with humidity and NIR inertness, and the other was chlorine-modified polypyrrole (PPy-Cl) doped poly(N-isopropylacrylamide-co-benzophenone) (PNIPAM-ABP) composite layer, taking advantage of the NIR photothermal conversion capability of PPy-Cl, along with the thermal-responsive PNIPAM-ABP. Upon NIR light irradiation , PPy-Cl converted light energy into heat, which subsequently induced the shrinkage of poly(N-isopropylacrylamide) (PNIPAM) chains; upon a high-humidity environment, PPy-Cl absorbed water molecular and transferred it into PNIPAM polymer , which further caused the bilayer to shrink or swell in an asymmetric manner, consequently leading to reversible bending or unbending behaviors. Interestingly, upon ultraviolet (UV) light irradiation with a grid photomask, the bilayer actuators showed bending or twist behaviors along with a special direction. The bionic flowers made from the actuators could imitate sunflower's opening and closing behaviors in response to NIR or humidity. The dual-response actuator could also imitate the lifting weight behaviors of forklifts. As an interesting example for potential utilization, a smart four-wheel vehicle was constructed using the bilayer actuator, showed excellent fast-moving performance.
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Frontiers in Chemistry
·
2023
·
IF 5.5
Zhang Chen,Wang Minqiang,Shi Jindou,Wang Junnan,Da Zheyuan,Zhou Yun,Xu Youlong,Gaponenko Nikolai V.,Bhatti Arshad Saleem
The inherent single narrow emission peak and fast anion exchange process of cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals severely limited its application in white light-emitting diodes. Previous studies have shown that composite structures can passivate surface defects of NCs and improve the stability of perovskite materials, but complex post-treatment processes commonly lead to dissolution of NCs. In this study, CsPb(Cl/Br)3 NCs was in-situ grown in TiO2 hollow shells doped with Eu3+ ions by a modified thermal injection method to prepare CsPb(Cl/Br)3/TiO2:Eu3+ composites with direct excitation of white light without additional treatment. Among them, the well-crystalline TiO2 shells acted as both a substrate for the dopant, avoiding the direct doping of Eu3+ into the interior of NCs to affect the crystal structure of the perovskite materials, and also as a protection layer to isolate the contact between PL quenching molecules and NCs, which significantly improves the stability. Further, the WLED prepared using the composites had bright white light emission, luminous efficiency of 87.39 lm/W, and long-time operating stability, which provided new options for the development of perovskite devices.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Peng Bao,Yaning Li,Wei Xiao,Wenxiang Bian,Jian Li,Mingshuai Xue,Saichao Song,Boliang Wang
Although 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) is one of the best high-energy explosives, its application is severely limited by its high sensitivity. Herein, a composite wax-film with interfacial crosslinking anti-falling was designed and fabricated to desensitize CL-20. It was filled with nano-silica powder (n-Si), nano-graphenes (n-GPNs) and multi-walled carbon nanotubes (MWCNTs) as insensitive enhancers. A unique and stable core-shell composite explosive was prepared, and characterized by DSC , SEM, TEM, XRD , XPS as well as mechanical sensitivity tests. The results suggested that the functional group interaction and structural strengthening between enhancers and microcrystalline wax (MW) further enhanced the desensitization ability of the composite film for CL-20. Because of the hydrogen bonding and thickening enhancement, the CL-20 crystal was uniformly coated with a nano-composite film. Three enhancers were demonstrated to be highly compatible with CL-20. In comparison with MW@CL-20, The E a , T p0 and T b of the composites containing n-GPNs increased by >375.27 kJ·mol −1 , 21.04 °C and 18.27 °C, respectively. The SEM and XPS results showed that the composite performed a complete core-shell structure with thermal softening resistance and superior coverage (98.20 %). The insensitive enhancer was also distributed and embedded in the MW-film matrix. Besides, the anti-fall and cross-linking properties of the film enable the mechanical sensitivity of the composite explosive to reach to a level better than that of WO 3 /Al nanothermite with 5 wt% polyaniline and polymer-bonded explosive (PBX) with 95 wt% LLM-105 and 5 wt% ternary composite. The heterogeneous composites demonstrated excellent mechanical safety and high energy performance. These findings can provide a reference for the efficient desensitization of CL-20.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Abubakar Yakubu Haruna,Yubo Luo,Zheng Ma,Wang Li,Haiqiang Liu,Xin Li,Qinghui Jiang,Junyou Yang
The thermoelectric performance of n-type Bi2Te3 needs further enhancement to match that of its p-type Bi2Te3 counterpart and should be considered for competitive applications. Combining Cu/Cl and multiscale additives (AgBiSe2) presents a suitable route for such enhancement. This is evidence of the enhanced thermoelectric performance of Bi1.995Cu0.005Te2.69Se0.33Cl0.03. Moreover, by incorporating 0.65 wt % AgBiSe2 (ABS) into Bi1.995Cu0.005Te2.69Se0.33Cl0.03, we further reduce its lattice thermal conductivity to ∼0.28 W m–1 K–1 at 353 K owing to the extra phonon scattering of multiscale ABS. Additionally, the Seebeck coefficient enhances (−183.89 μV K–1 at 353 K) owing to the matrix’s reduced carrier concentration caused by ABS. As a result, we achieve a high ZT of ∼1.25 (at 353 K) and a high ZTave of ∼1.12 at 300–433 K for Bi1.995Cu0.005Te2.69Se0.33Cl0.03 + 0.65 wt % ABS. This work provides a promising strategy for enhancing the thermoelectric performance of n-type Bi2Te3 through Cu/Cl doping and ABS incorporation.
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Small
·
2021
·Vol. 17
·期 28
·2101403
·
IF 13.281
Qiqian He,Gaoyu Chen,Yongkai Wang,Xiaoyu Liu,Danting Xu,Xiangxing Xu,Ying Liu,Jianchun Bao,Xun Wang
All-Inorganic perovskite CsPbX 3 (X = Cl, Br, I) quantum dots (QDs) have attracted tremendous attention in the past few years for their appealing performance in optoelectronic applications. Major properties of CsPbX 3 QDs include the positive photoconductivity (PPC) and the defect tolerance of the in-band trap states. Here it is reported that when hybridizing CsPbX 3 QDs with indium tin oxide (ITO) nanocrystals to form CsPbX 3 -ITO nano-heterojunctions (NHJs), a voltage tuned photoresponse—from PPC to negative photoconductivity (NPC) transform—is achieved in lateral drain-source structured ITO/CsPbX 3 -ITO-NHJs/ITO devices. A model combining exciton, charge separation, transport, and most critical the voltage driven electron filling of the in-band trap states with drain–source voltage ( V DS ) above a threshold, is proposed to understand this unusual PPC-NPC transform mechanism, which is different from that of any known nanomaterial system. This finding exhibits potentials for developing devices such as photodetectors, optoelectronic switches, and memories.
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JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Cheng Zhang,Xihao Pan,Siyao Cheng,Aming Xie,Wei Dong
With the increasingly severe international situation, explosive detection has become an important topic of national security, and the rapid and efficient chemical sensors have attracted people's attention. In this work, a novel sensor CSA was synthesized through cholesterol succinate and 1-Aminopyrene. UV–vis and fluorescence spectra showed that CSA had a typical aggregation-induced emission （AIE） effect in THF/H 2 O solution, and explosive CL-20 could effectively quench this fluorescence. Also, the seal and cotton swab prepared by CSA can specifically detect CL-20, providing a platform for the practical application of CSA in public safety.
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高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 15
·4914-4919
·
IF 4.174
Ting Wang,Yi-Gang Chen,Yao Guo,Fang Wang,Qi Song,Ying-Jie Jia,Xian-Ming Zhang
Isostructural mixed alkali/alkaline-earth metal tellurite halides BaLiTe2O5X (X = Cl, Br) have been successfully synthesized by a mild hydrothermal method, which possess the [Te2O5]∞ chains formed by the corner-sharing connections of the TeO3 and TeO4 polyhedra. The [Te2O5]∞ chains are bridged via the LiO3 polyhedra to form the [LiTe2O5]∞ layers with 4- and 6-membered rings. The adjacent [LiTe2O5]∞ layers are linked via the BaO9 polyhedra to form the [BaLiTe2O5]∞ double layers, which are further connected via weak Ba–X–Li interactions to generate a 3D framework. Analysis of different lithium tellurites shows that the different arrangements of the Te–O and Li–O units in the lithium tellurites can be attributed to the cation–cation repulsion and lone-pair effect. Both compounds display good thermal stability, wide optical bandgaps (4.25 and 4.13 eV), and large birefringence. First-principles calculations indicate that the TeOn groups and X− determine the optical properties of BaLiTe2O5X (X = Cl, Br).
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