GREEN CHEMISTRY
·
2018
·Vol. 20
·期 15
·3557-3565
·
IF 8.586
Junjie He,Shixing Yang,Kai Zheng,Youming Zhang,Jun Song,Junle Qu
The lighting market has been dominated by light emitting diodes (LEDs), which not only need Ga for wafer production, but also consume abundant non-sustainable rare-earth elements such as Y, Ce and Eu. Hybrid-LED technology using organic downconversion materials (ODMs) is a promising candidate technology to save the rare-earth elemental resources. However, it is still a challenge to fabricate hybrid-LED devices with a high color rendering index (CRI), lumen efficiency and long lifetime at the same time. Herein, highly dispersible perylene diimides are synthesized in short routes and dispersed into a polymer matrix at high temperature to produce low cost light ODMs. Cold to warm white LED lamps with a CRI up to 92 can be fabricated with the ODMs. In particular, a warm white lamp with the same high CRI and efficiency up to 82 lm W−1 is obtained. It is comparable to all inorganic warm white LEDs with such a high CRI. By applying our OMDs, an approach for highly efficient yellow LED lamps, which can improve efficiency by 66% to 153 lm W−1 compared with the present method, is illustrated. More importantly, incorporating a remote phosphor configuration (RPC) effectively improves the lifetime of ODMs superior to 2870 h, extrapolated to 6000 h maintaining 70% of the original fluorescence efficiency after continuous operation in an ambient environment. This approach could be a quite simple protocol paving the way for the practical application of hybrid-LED lamps.
研究领域:
材料科学
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光学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE RESEARCH
·
2022
·
IF 2.975
Jiangqin Lu,Shan Lu,Qinghua Cao,Juncheng Huang,Fei Liu,Haining Na,Jin Zhu,Zhen Jia
An easy and effective way to synthesize dual-functionalized cellulose derivatives with processability and fluorescence functionality by one-pot modification of successive esterification and carbonation under mild condition is established with the use of DMSO/DBU/CO 2 system. Accordingly, four kinds of dual-functionalized cellulose derivatives with rather good fluorescent response are obtained. After blending the synthesized dual-functionalized cellulose derivative with cellulose acetate as functional additive in solution, cast film with the elastic modulus , stress and strain reaches to 2.2 GPa, 34.1 MPa and 5.7% is prepared. Besides, the cast film also exhibits the ability to detect the pH value at 12–14 with detection accuracy of 0.4 through the change of fluorescent color. This research shows a simple but effective way to prepare dual-functionalized cellulose derivatives for the high-quality applications in field of detection.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yuanlong Guo,Gu Guo,Pengcheng Liu,Yang You,Jili Yuan,Gang Hu,Lei Dai,Michael North,Haibo Xie,Qiang Zheng
Cellulose graft copolymers having well-defined structures could incorporate the characteristics of both the cellulose skeleton and side chains, providing a new method for the preparation functionalised cellulose derivatives . Herein, a series of multifunctional cellulose grafted, alternating 3,4-dihydrocoumarin (DHC) and epoxide (EPO) copolymers (cell- g -P(DHC- alt -EPO)) were prepared in a metal-free DBU/DMSO/CO 2 solvent system without adding additional catalyst. Four examples of cell- g -P(DHC- alt -EPO) with tunable thermal and optical properties were synthesized by copolymerization of DHC with styrene oxide (SO), propylene oxide (PO), cyclohexene oxide (CHO) or furfuryl glycidyl ether (FGE) onto cellulose. The nonconjugated cell- g -P(DHC- alt -EPO) showed UV absorption properties with the maximum absorption peak at 282 nm and 295 nm and photoluminescence performance. A clustering-triggered emission mechanism was confirmed and consistent with DFT theoretical calculations. In DMSO solution, the copolymer (DHCSO5) with DP of 11.64 showed ACQ behaviour as the concentration increased. In addition, DHCSO5 had good antioxidant capacity with an instantaneous radical scavenging activity of 2,2-diphenyl-1-picrylhydrazine (DPPH) up to 65 % at a concentration of 40 mg/ ml and increased to 100 % after 30 min. Thus, the multifunctional cell- g -P(DHC- alt -EPO) materials had a variety of potential applications in the fields of fluorescent printing, bio-imaging, UV- shielding and antioxidants.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Zidong Zhang,Yuming Tu,Hui Yu,Weidong Liu,Zhiyong Zhou,Zhongqi Ren
Extraction is a common approach to separating aromatics and alkanes, but solvent recovery remains an issue. The polarity, hydrophobic/hydrophilic balance, and other properties of switchable solvents can be reversibly changed in the presence of various triggers, and taking advantage of this property can greatly simplify the process of solvent recovery. In this work, quaternation and anion exchange were used to prepare several switchable solvents by introducing OH– ions to derivatives of the amidine compound 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The resulting compounds exhibited reversible switching in response to exposure to CO2. Using toluene/n-heptane as a model hydrocarbon mixture, a reversible phase change extraction process was established. Among the four switchable solvents prepared, [C2DBU]OH showed the highest selectivity value and so was used to investigate the effect of various parameters on hydrocarbon separation. The extraction process was found to rapidly reach equilibrium when a two-phase system was generated by bubbling CO2 through the extraction mixture. Increasing the proportion of the solvent increased the selectivity for toluene, while a 1:1 ratio between the solvent and the toluene/n-heptane mixture enhanced the extraction. Increasing the initial toluene concentration reduced the selectivity for toluene, with a value of 5.97 at a toluene concentration of 20%. The switchable solvent recovered its initial state when heated at 60 °C for 1 h. Upon being reused after removal of CO2, the solvent exhibited poor separation characteristics, although the selectivity coefficient remained constant at approximately 3.1 during 10 regenerations. Finally, the mechanism of the switchable solvent effect and modeling of experimental data were investigated.
研究领域:
化学工程
·
分离科学
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溶剂化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xilei Yin,Yuanlong Guo,Wene Zhang,Xinjie shen,Hu Cai,Gu Guo,Xuejun Pan,Haibo Xie
Due to the superior nutrient management and biodegradation properties, the biodegradable slow-release fertilizer shows a greater market prospect and environmental protection significance in the chemical fertilizer industry. In this study, a new kind of full bio-based slow-release fertilizers (B-SRFs) encapsulated by walnut wood-based lignocellulose-grafted with poly(ε-caprolactone) (WWL- g -PCL) in the presence of urea was prepared. Considering the multi-hydroxyl structural feature of walnut wood-based lignocellulose , WWL- g -PCLs were synthesized successfully through the ring-opening graft polymerization reaction (ROP) of walnut wood and ε-caprolactone in DBU/DMSO/CO 2 solvent system without adding additional catalyst. The structural and thermal characteristics of WWL- g -PCLs were thoroughly elucidated by nuclear magnetic resonance (NMR), fourier transform infrared spectroscopy (FT-IR), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). The results indicated that the WWL- g -PCLs exhibited favorable thermal properties with adjustable glass transition temperature (T g ) from 20.8 to 29.3 °C compared with walnut wood-based lignocellulose, which was beneficial for melt extrusion and granulation to produce B-SRFs. Scanning electron microscope (SEM), static release in water, and tomato fertilization efficiency experiments were conducted to delve into the slow-release mechanism and assess practical application effects. Subsequently, the outstanding slow-release performance of B-SRFs was observed for cumulative nutrient releases of 48–72% within 5 h in water and agreed with the Korsmeyer-Peppas model, indicating its excellent slow-release property. Furthermore, the formulated B-SRFs demonstrated a substantial increase in tomato cumulative biomass, yield, soil organic matter , and fertilizer utilization. Notably, there was a remarkable 57.8% increase in the cumulative biomass of tomatoes. These findings underscore the potential of walnut wood derivatives in developing effective and environmentally friendly slow-release fertilizers with promising agricultural applications.
研究领域:
材料科学
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
Carbohydrate Polymer Technologies and Applications
·
2021
·
IF 0
Xin Bao,Chunhong Wang,Zhenyu Zhang,Qinghua Cao,Fei Liu,Jing Chen,Chuanzhi Zhang,Haining Na,Jin Zhu
In this article, three kinds of cellulose carbonated derivatives are synthesized by modifying cellulose with alkyl halides (namely bromopropane, benzyl bromide and bromomethyl cyclopropane) in DBU/DMSO/CO2 system. The wet spinnability and filament properties of the obtained cellulose carbonated derivatives are investigated. Through rheological analysis, the solutions of various cellulose carbonated derivative in Newtonian fluid state can show good wet spinnability. Filaments with smooth surface and uniform morphology can be obtained from the solution with viscosity over 0.07Pa•s. The cellulose carbonated derivatives in the filament show similar in tight orderly rows. Among them, the cellulose propyl carbonated derivative filament exhibits the highest mechanical properties and heat resistance. By using of DBU/DMSO/CO2 system, the wet spinning and key control condition of cellulose carbonated derivatives are combined to achieve for the formation of filament with uniform morphology.
研究领域:
材料科学
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化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 6
·2352-2361
·
IF 10.182
Yuanlong Guo,Long Li,Gu Guo,Min Pei,Lihua Zhang,Haibo Xie,Hui Sun,Qiang Zheng
Recently, cellulose esters with particular functionality have obtained considerable attention as they can be used in various fields; therefore, the design and facile synthesis of cellulose esters is still a prime subject of research in this area. In this study, a novel cellulose derivative, namely cellulose-3-(2-hydroxyphenyl) propionate ester (CHP), was first prepared using cellulose and 3,4-dihydrocoumarin (DHC) in dimethylsulfoxide (DMSO)/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/CO2, a newly developed cellulose solvent system, without adding any external catalyst. The effects of the reaction conditions on the substitution degree (DS), including DHC loading, reaction temperature and time, were systematically investigated, and the CHP with a DS of 2.35 could be prepared when the molar ratio of DHC to anhydroglucose units (AGU) was set at 6/1 at 120 °C in 3 h. The structures and thermal properties of the as-prepared CHP were fully elucidated by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The ultraviolet (UV) absorption properties and free radical scavenging ability were evaluated by UV-visible absorption spectroscopy and a well-developed 2,2-diphenyl-1-picrylhydrazyl (DPPH)-based colorimetric protocol. The CHPs were identified to have satisfactory UV absorption properties and antioxidant capacity, and the instant DPPH radical scavenging activity reached 68.1% to 100% in 30 min when 40 mM of CHP was applied at 25 °C. Kinetic studies demonstrated that the reaction followed a pseudo-first order reaction kinetic model, and the activation energy (Ea) and Arrhenius frequency factor (A) of CHP-3 to DPPH could be calculated to be 24.24 kJ mol−1 and 2.5918 s−1 by the Arrhenius equation, respectively. The cytotoxicity of the CHPs was also primary evaluated in L929 cells to identify the potential of CHPs for biomedical applications.
研究领域:
材料科学
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化学
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生物医学工程
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高分子科学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 22
·期 3
·707-717
·
IF 9.405
Min Pei,Xinwen Peng,Yuqing Shen,Yunlong Yang,Yuanlong Guo,Qiang Zheng,Haibo Xie,Hui Sun
Cellulose esters are important cellulose derivatives with good processing ability and material properties. The design and sustainable synthesis of cellulose esters are prime research topics. Herein, cellulose levulinate esters (CLEs) with degrees of substitution (DSs) ranging from 0.15 to 2.04 were simply prepared through an atom-economic reaction between cellulose dissolved in a newly developed 1.8-diazabicyclo[5.4.0]undec-7-ene/dimethyl sulfoxide/carbon dioxide solvent system and alpha-angelica lactone, a biomass-derived and commercially available platform chemical, without the addition of any external catalysts or condensation reagents. The optimized reaction conditions of 120 °C, 0.5 h, and a 5/1 molar ratio of alpha-angelica lactone to the hydroxyl groups in cellulose resulted in CLEs with appropriate DSs and satisfactory material properties. The structures and thermal properties of the CLEs were characterized by nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis to develop an in-depth understanding of the correlations among the chemical structures, thermal properties, and mechanical properties. A study of solubility in conventional solvents indicated that the CLEs with appropriate DSs were soluble in water, providing a green processing strategy to prepare CLE films with tensile strengths of up to 72 MPa and elongation at break values of up to 26.7%. The morphologies of the films were characterized by scanning electron microscopy and atomic force microscopy. The cytotoxicity of the water-soluble CLEs was also evaluated in vaginal epithelial cells (VK2/E6E7) to identify the potential of the CLEs for biomedical applications.
研究领域:
材料科学
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化学工程
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生物医学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yamei Lin,Fei Wang,Enxiang Ren,Fuying Zhu,Qiang Zhang,Guo-Ping Lu
The development of novel iron heterogeneous catalysts for organic synthesis is attractive and significant for both academic and industrial applications. A carbon-based iron heterogeneous catalyst (Fe@NSiC) comprising of different iron species including iron atomic single sites (FeN x Si y ), iron silicate and iron nanoparticles (NPs) has been developed. This catalyst exhibits high performance on the solvent-free synthesis of pyrroles from nitroarenes and 2,5-hexanedione via cascade reaction using HCOOH/DBU as the reductant. Si doping can increase Lewis acid sites of the catalyst and the electron density of iron sites, thus promoting the reaction. Furthermore, a set of pyrroles reflecting potential interest from the pharmaceutical perspective are obtained with moderate to excellent yields in this chemistry.
研究领域:
催化
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有机化学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Haiwen Li,Junhu Xin,Yuhang Xue,Cunde Wang
A pseudo-three-component annulation reaction of substituted 2-amino-4H-chromen-4-ones with aromatic aldehydes promoted by DBU was investigated to access polysubstituted 5H-chromeno[2,3-b]pyridines. This reaction included a sequential intermolecular nucleophilic addition/Michael cyclization/intramolecular epoxidation/ring opening/aromatization sequence, which possessed excellent step and atom economy in a single operation for generating 3-hydroxy-5H-chromeno[2,3-b]pyridines from readily available substrates.
研究领域:
有机化学
·
药物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 41
·28931-28939
·
IF 3.9
Guoqing Li,Zhiyi Zhang,Wenhao Xiao,Tongtong Wu,Jinbao Xu
The broad application of polyacrylamides (PAMs) has greatly promoted the development of new synthetic methods to prepare PAM-based functional (co)polymers regarding their traditional preparation via the direct polymerization of various acrylamide monomers. Herein, we have explored the post-polymerization modification of the poly(2,2,2-trifluoroethyl acrylate) (PTFEA) homopolymer, a typical non-activated ester, and various amines using the organo-catalytic system involving 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,2,4-triazole (TA). The reaction kinetics (e.g., the optimized reaction solvent, temperature, time, initial molar ratio of amines to esters and the molar ratio of DBU to TA) were carefully studied with the modulus substrate of iso-propylamine as the formed poly(iso-propyl acrylamide) (PNIPAM) representing the most investigated PAM. The full and partial amidation of the esters in PTFEA could be precisely regulated just by controlling the kinetic conditions to give (co)polymers with designable compositions and structures. We have demonstrated that the poly(N-acryloyl pyrrolidine) obtained by the post-polymerization modification of non-activated ester and pyrrolidine exhibited a noticeable phase transition, which confirmed the robustness and versatility of the post-polymerization modification. The described method paves the way for the synthesis of various (co)polymers with amide side chains from readily available polymer precursors.
研究领域:
高分子化学
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材料科学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Sustainability
·
2025
·
IF 4.9
ZIXIAN JIA,JIE ZHANG,LIN GAO,LIJIAO QIN,HAOCHENG SUN,JIAXING CHEN,Jian-Zhong Yin
The chemical recycling of polyethylene terephthalate (PET) via glycolysis is a promising route for recovering the monomer bis(2-hydroxyethyl) terephthalate (BHET), which can be used for virgin-grade PET production. However, the influence of water—an inevitable impurity and potential byproduct—on this process is complex and not fully elucidated. This study systematically investigates the effect of water content (0–22.2 vol%) on PET glycolysis using selected heterogeneous catalysts (ZnO, Mn₂O₃) and homogeneous catalysts (zinc acetate (ZnAc₂), 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)). Product distribution and reaction kinetics were quantified by HPLC and in-situ IR spectroscopy, respectively.The heterogeneous catalysts (ZnO, Mn₂O₃) and homogeneous ZnAc₂ maintained high PET conversion (>95%) even at elevated water concentrations. Nevertheless, the BHET yield and selectivity for these systems decreased significantly due to a competing hydrolytic side reaction, promoted by water, which yields terephthalic acid (TPA). Notably, ZnAc₂ exhibited a more rapid decline in BHET selectivity compared to ZnO. Conversely, the organic base catalysts TBD and DBU experienced complete deactivation in the presence of water, resulting in a drastic reduction in both PET conversion and BHET yield, with DBU showing greater susceptibility. In-situ IR experiments corroborated that the deactivation mechanism for TBD involves protonation by water. These results emphasize that water's influence is a function of the catalyst's chemical nature, modulating product selectivity for metal-based systems while causing the deactivation of organic bases. Understanding these divergent effects is critical for the optimization of industrial PET glycolysis and the rational design of water-tolerant catalytic systems.
研究领域:
高分子化学
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催化化学
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化学回收
·
反应工程
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环境化学
·
材料科学
✓ 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）