Crystals
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2021
·Vol. 12
·期 1
·19
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IF 2.589
Dawei Luo,Jian Zhang,Yu Liang,Jianling Ni,Fangming Wang,Wei Liu
Here, organic-inorganic hybrid molecular compounds based on copper(I) bromide have been synthesized by slow-diffusion method. The inorganic modules of these two structures are Cu2Br42−anion, and the inorganic modules are coordinated to cationic organic ligands via Cu-N coordinative bonds. Both of these compounds are luminescent, emitting green emissions under UV excitation.Keywords:organic-inorganic hybrid;luminescence;copper bromide
研究领域:
材料科学
·
化学
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 3
·2472-2477
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IF 3.3
Yingui Gao,Zhihuang Xu,Liwang Ye,Yuanjie Wang,Xinxin Zhuang
Lead-free metal halides are considered as alternatives to lead-based perovskites due to their low toxicity, rich structural diversity, and high luminescence properties. We report millimeter-sized single crystals of a new zero-dimensional (0D) copper(I)-based hybrid material, (AEP)2Cu2Br6·2Br·2H2O (AEP = C6H18N33+), which exhibits bright broadband green photoluminescence (PL) at 510 nm with a Stokes shift of 220 nm and a PL lifetime of 121.1 μs. Density functional theory (DFT) calculations and experimental studies reveal that the green light can be attributed to self-trapping exciton (STE) emission. It is worth mentioning that this crystal has a high photoluminescence quantum yield (PLQY) of 90.5%, which is higher than most copper halides.
研究领域:
材料科学
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光电学
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光子学
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PubMed
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
·
IF 3.764
Wenli Liu,Qizhi Yang,Yili Yang,Feiyue Xing,Pu Xiao
In the past decades, polymeric fluorescent materials with aggregation-induced emission (AIE) properties play important roles in the fields of biomedical and analytical chemistry, and the synthesis of well-defined polymers under mild conditions is in demand. In this report, narrowly distributed poly(methyl methacrylate)s (PMMAs) with AIE properties were prepared in mild conditions using 4-(1,2,2-triphenylvinyl)benzyl 2-bromo-2-phenylacetate (TPE-BPA), a novel initiator with an AIE-based functional group. This approach resulted in PMMAs with a fluorescent tag at the chain end (TPE-PMMA). Specifically, a high efficiency of initiation was observed using a low amount of air-stable copper(II) bromide/tris(2-pyridylmethyl)amine (CuIIBr2/TPMA) as a photocatalyst under the irradiation of LED@405 nm. Moreover, the TPE presented in the system did not affect the polymerization kinetics of MMA and the temporal control. The dispersities of the obtained PMMAs were as low as 1.12. Interestingly, TPE-PMMA with narrow dispersity was also obtained (Mw/Mn < 1.25) in the presence of air. Regarding the fluorescent properties of TPE-PMMAs, it was observed that their AIE intensities increased with the molecular weights. Moreover, they could also be used to probe the increased viscosity of the solution, indicating their potential of synthesizing functional sensors. The approach proposed in this work is convenient to prepare poly(methacrylate)s with well-defined structures in the presence of AIE-based fluorescent tags, and it thus paves a new way for the rational design of AIE-functionalized polymeric materials.
研究领域:
高分子化学
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材料科学
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分析化学
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生物医学工程
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
·
IF 11.4
Zhenyu Chen,Lu Zhan,Zhenming Xu
Bromine removal is significant in the recycling of waste printed circuit boards (WPCBs). This study found that the critical factors limiting the debromination efficiency of conventional pyrolysis are the formation of coke impeding mass transfer and conversion of bromine into less volatile species, such as coking-Br and copper bromide. According to frontier molecular orbital analysis and thermodynamic equilibrium analysis, C–O bonds of resin are sites prone to electrophilic reactions and copper bromide in residue may undergo hydrolysis; therefore, introducing H2O during pyrolysis was a feasible method for thorough debromination. Through pyrolysis in a water vapor atmosphere, the diffusion limitation of debromination was overcome, and resin was converted into light components; thereby, rapid and deep removal of bromine was achieved. The result indicated that 99.7% of bromine was removed, and the residue could be used as a clean secondary resource. According to life-cycle assessment, pyrolysis of WPCBs in water vapor could be expected to reduce 77 Kt of CO2 emission and increase financial benefits by 60 million dollars, annually.
研究领域:
环境科学
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化学工程
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材料科学
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可持续性
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DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Zhijie Zhang,Xuesheng Wang,Junyi Qian,Jiayue Xu
Heterojunction construction, especially S-scheme heterojunction, represents an efficient universal strategy to achieve high-performance photocatalytic materials. For further performance stimulation of these well-designed heterojunctions, modulating the interfacial internal electric field (IEF) to steer dynamic charge transfer represents a promising approach. Herein, we realized the precise regulation of Fermi level ( E F ) of the oxidation semiconductor (mesoporous WO 3− x ) by tailoring the concentration of oxygen vacancies (V O ), maximizing the IEF intensity in Cs 2 CuBr 4 @WO 3− x (CCB@WO 3− x ) S-scheme heterojunction. The augmented IEF affords a robust driving force for directional electron delivery, leading to boosted charge separation. Hence, the developed CCB@WO 3− x S-scheme heterojunction demonstrated outstanding photocatalytic CO 2 reduction performance, with the electron consumption rate ( R electron ) up to 390.34 μmol g −1 h −1 , which is 3.28 folds higher than that of pure CCB. An in-depth analysis of the S-scheme electron transfer mode was presented via theoretical investigations, electron spin resonance (ESR), photo-irradiated Kelvin probe force microscopy (KPFM), and in-situ X-ray photoelectron spectroscopy (XPS). Finally, the CO 2 photoconversion route was explored in detail using in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and DFT theoretical calculations.
研究领域:
材料科学
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环境科学
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化学
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高影响因子
CARBOHYDRATE POLYMERS
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2024
·
IF 10.7
Tongjun Yang,Rongli Li,Mingtao Ding,Hong Yu,Lihua Zhang,Haibo Xie
Chitin nanocrystals (ChNCs), prepared from a down-sizing process from chitin, have recently captured great attention to access sustainable nanomaterials. The surface modification of ChNCs is crucial to regulate the surface physicochemical properties and introduce specific functions, thus satisfying their diverse applications. In this study, aldehyde-functionalized ChNCs (ChNCs-PVMA) with enhanced hydrophobicity were developed via surface-initiated activators regenerated by electron transfer for atom transfer radical polymerization (SI-ARGET ATRP) of a lignin-derived polymerizable aldehyde monomer, vanillin methacrylate (VMA). The monomer conversion was determined by 1 H NMR spectroscopy of the reaction mixture based on the change of the relative ratio of VMA and solvent signals. The prepared ChNCs-PVMA were systematically characterized by FTIR, CP/MAS 13 C NMR, XPS, XRD, DSC, TGA, and TEM. The dispersibility of ChNCs and ChNCs-PVMA in water and DMF was evaluated by dynamic light scattering and visual observation, indicating good dispersion of ChNCs-PVMA in organic solvents. Furthermore, based on the available aldehyde groups, the ChNCs-PVMA was reacted with amino acids via Schiff base reaction, demonstrating a rich follow-up chemistry towards diverse functions by the reactive aldehyde groups.
研究领域:
材料科学
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化学工程
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生物材料
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
·
IF 5.3
Yubin Zhao,Xing Cao,Huanhui Chen,Ya Liu,Liubiao Zhong,Yejun Qiu
Low-dimensional metal halides are favored for optoelectronic device applications due to their strong electron–phonon coupling capability, which produces exciton self-trapping and broadband emission optoelectronic properties. Conventional methods for enhancing electron–phonon coupling involve the introduction of permanent defects or lattice distortions that inhibit the intrinsic structure and properties. In this work, we report that Cu-doped CsPb2Br5 nanocrystals exhibit broadband red emission with a high Stokes shift, a long fluorescence lifetime (9.27 μs), and a high photoluminescence quantum yield (∼ 36%) in the visible to near-infrared spectral range (∼550 to 825 nm). At the same time, the fact that the emission spectrum is independent of the excitation wavelength and the excitation spectrum is independent of the emission wavelength, together with the similarity of the decay kinetics, suggests that the broad-band emission has intrinsic properties. The soft vibrational modes of Raman spectroscopy indicate the softness of the lattice and the highly anharmonic character of the structure on the global and local scales. These properties lead to short-range elastic lattice deformation of Cu/CsPb2Br5 nanocrystals upon photoexcitation by strong electron–phonon coupling, resulting in self-trapped exciton emission. This method of doping-induced local distortion and exciton self-capture provides a way to improve the properties of the optoelectronic materials. Meanwhile, the fluorescence change in the crystal structure from CsPbBr3 to CsPb2Br5 can also be used for anticounterfeiting inks. Therefore, CsPb2Br5 crystals have promising applications in solid-state lighting and optoelectronic devices.
研究领域:
材料科学
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光学
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固体物理
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Jingyu Zhang,Yan Wang,Mei Hong,Bin Peng,Yicheng Jiang,Shaobin Wen,Weishuo Li,Qiang Zhang
Fenton catalyst plays a significant role in Fenton-reaction mediated water treatment. Herein, three ferrocene-containing polymers have been prepared as smart Fenton catalysts capable of switching between homogeneous and heterogeneous phases for degrading complex water pollutants. Specifically, at 25℃, the smart catalyst is hydrophilic and parallels the catalytic behavior of correspondingly homogeneous one. While at 50℃, the smart catalyst aligns with the performance of heterogeneous one, showing a catalytic preference towards hydrophobic pollutants. The catalytic mechanism of all three catalysts are based on generated superoxide radicals and singlet oxygen, of which generation is not affected by temperatures. Notably, the polymeric Fenton-catalyst displayed a super tolerance towards salts. Our study provides a possibility of degrading complex water pollutants with one smart catalyst.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2024
·
IF 8.1
Xiaofeng Yu,Zheng Xu,Yaobin Lu,Li Yang,Shihao Sun,Miao Du,Min Zuo,Qiang Zheng
The effect of selective distribution of two kinds of poly (methyl methacrylate)-grafted graphene oxide (PMMA- g -GO) nanosheets (NSs) on the phase behavior and conductivity of PMMA/poly (vinyl acetate) (PVAc) blends is investigated. The grafting density and length of two modified GO NSs are different, resulting in their thermodynamic equilibrium location in the blend matrix, but their initial locations are both in the PVAc-rich phase with low viscosity. The PMMA- g -GO(6 k) NSs with the sparse mushroom-like grafted PMMA chains gradually migrate to the interface of blend matrix and aggregate to form the conductive network, resulting in the suppression of domain coarsening and long-term maintenance of co-continuous morphology. The grafted chains on the surface of PMMA- g -GO(58 k) NSs exhibit the screened wet brush and the PMMA matrix chains can penetrate with the grafted chains, resulting in the location in the PMMA-rich phase. Two modified GO NSs filled PMMA/PVAc nanocomposites can occur the conductive percolation and such activation energies are higher than those of flow for PMMA and PVAc, indicating that the interactions between modified GO and polymer components may restrict the aggregation of conductive modified GO NSs at the interface or in the PMMA-rich phase.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
BIOFOULING
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2024
·
IF 2.6
Honghe Song,Yuheng Jiang,Caixiang Chen,Shumei Wen,Zhenzhen Zhou,Chenghu Yan,Wei Cong
To improve the durability of the photobioreactor antibiofouling surface for microalgal cultivation, a series of photoreactive poly(2,2,2-trifluoroethyl methacrylate) (PTFEMA) were successfully synthesized and used to modify ethylene-vinyl acetate (EVA) films by a surface coating and UV light grafting method. Fourier transform infrared (FT-IR) spectra, X-ray photoelectron spectroscopy analysis (XPS) and fluorescence microscopy results indicated that PTFEMA were fixed successfully onto the EVA film surface through a covalent bond. During the microalgal adhesion assay, the number of EVA-PTFEMA film-adhered microalgae was 41.4% lower than that of the EVA film. Moreover, the number of microalgae attached to the EVA-PTFEMA film decreased by 61.7% after cleaning, while that of EVA film decreased by only 49.1%. It was found that the contact angle of EVA-PTFEMA film surface increased, and remained stable when immersed in acid and alkali solution for up to 90 days.HIGHLIGHTSDurable photobioreactor antibiofouling surfaces for microalgal cultivation were prepared successfully.The contact angle of antibiofouling coating surface remained stable in acid and base environment for 90 days.The attached microalgae on antibiofouling surface decreased 41.4% than those of unmodified surface.The attached microalgae on antibiofouling surface could be cleaned by 61.7% through changing the flow velocity of microalgal suspension.
研究领域:
生物技术
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 13
·e55146
·
IF 2.7
Qin Liu,Lan Xu
In this study, the gold nanoparticles (Au NPs) are capped with a novel, well-defined double hydrophilic block copolymer, poly (ethylene glycols)-block-poly(mono-2-(methacryloyloxy) ethyl succinate) (PEG-b-PSEMA). The PEG-b-PSEMA, with long side chains and relatively narrow dispersity index, is successfully prepared by aqueous electrochemically mediated atom transfer radical polymerization using a PEG-Br macroinitiator (M n ≈2000 g mol −1 ). By simply mixing PEG-b-PSEMA and Au precursor before adding reductants, coulombic interactions occur between the Au precursor and the carboxylate group of the PSEMA, as a result dense Au NPs are formed. This enables the Au NPs to remain dispersed even in the presence of temperature variations, pH adjustments, and incubation in organic solvents. Au NPs were endowed by PEG-b-PSEMA with more remarkable catalytic activity in organic solvents of 4-nitrophenol into 4-aminophenol than by sodium citrate (Au@citrate) and MeO-PEG-OH (Au@PEG). In addition, PEG-b-PSEMA-stabilized Au NPs (Au@PEG-b-PSEMA) were also tested for the dye degradation property against Rhodamine-B in only pH 10 basic solution, and over 99% of dye degradation can be achieved in 9 min. PEG-b-PSEMA induces coulombic interactions with Au NPs, providing outstanding stability for catalytic applications in organic or specific acidic-base environments.
研究领域:
材料科学
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化学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Xiaoling Xu,Bin Peng,Yanqiu Wang,Yaqi Dong,Hui Wang,Wentong Chen,Yan Liu,Qiang Zhang
The incorporation of polyhedral oligomeric sesquisiloxane (POSS), a distinctive nanoparticle, into the membrane separation layer represents an effective strategy for enhancing the chlorine resistance of membranes. This modification contributes to both the durability of the membrane and its separation efficiency. However, POSS is easy to agglomerate, which affects the separation performance of the membrane. In this paper, POSS-centered polyhydroxy polymer (OMEPOSS-P(GMA-NMDG)) was synthesized via photo-induced atom transfer radical polymerization and used as water-soluble monomer to prepare polyester separation layer on porous substrates through interfacial polymerization with trimelanoyl chloride. The obtained POSS-centered polyester membrane exhibits a high dye removal rate exceeding 99 %, and it can realize the screening of dye molecules with different molecular weight and different charge. Notably, the membrane demonstrates excellent chlorine resistance, maintaining effective separation efficiency after exposure to sodium hypochlorite solutions at concentrations of 10 000 ppm for 96 h and 1000 ppm for 7 days. It is worth noting that the membrane showed high anti-fouling performance. This method provides a useful guideline for the development of chlorine-resistant and anti-fouling separation membranes.
研究领域:
材料科学
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分离技术
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环境工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）