TETRAHEDRON-ASYMMETRY
·
2014
·
IF 2.165
An-lin Zhang,Li-wen Yang,Nian-fa Yang,Yan-ling Liu
A series of C 2 -symmetric chiral amino diol tridentate ligands 3a – g were prepared from achiral bulky organolithiums, achiral bulky primary amines , and optically active epichlorohydrin (ECH). The prepared C 2 -symmetric chiral amino diol tridentate ligands were capable of inducing enantioselectivity in the model reaction of aromatic and aliphatic aldehydes with diethylzinc with an ee of up to 96%. The enantioselectivity can be modulated by adjusting the steric hindrance of the achiral reagents employed in the synthesis of the chiral ligand. The configuration of the addition product depended on the configuration of the amino diol ligands, which can be simply controlled as desired by using the ECH with the desired configuration during the preparation of the ligand.
研究领域:
有机化学
·
催化
·
立体化学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Yingfang Nie,Yu Mei,Youcai Zhu,Yue Mu,Yulong Wu,Li Sun,ZhenHao Xi,Zhen Liu
The copolymerization of carbon dioxide (CO 2 ) and propylene oxide (PO) catalyzed by diethyl zinc/glycerol has been studied by experimental and theoretical approaches. The efficiency of the catalyst is strongly determined by the preparation methods, as the catalyst showed high activity when the catalyst was prepared by dropping glycerol into diethyl zinc. Conversely, the catalyst showed almost no activity when the dropping order was reversed. The order of dropwise addition could change the reaction between diethyl zinc and glycerol, which affects the structure of the catalyst and leads to a change in the catalytic activity. DFT calculations showed that the catalyst is self-assembled and the copolymerization follows a bimetallic coordination-push mechanism.
研究领域:
化学
·
材料科学
·
催化
·
计算化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Mingrui Liu,Guangmin Li,Shunsheng Wei,Hongfei Liu,Gaoling Yang
Chiral semiconductor nanocrystals (NCs) represent a promising class of materials for various applications, including biological sensing, photonics, and spin-polarized devices. However, the comprehension of the mechanisms underlying ligand-induced chiroptical effects in NCs has been limited by the constraints of current theoretical and experimental models, particularly those involving simple spherical NCs. In this study, we examined the relationship between optical activity and band structures in core–shell dot-in-rod NCs, specifically CdSe@CdS, ZnSe/CdS@CdS, and ZnSeTe/CdS@CdS dot-in-rod NCs, which were functionalized with chiral ligands. By manipulating the wave function distribution of electrons and holes within the dot-in-rod NCs, we demonstrated through circular dichroism (CD) measurements that a reduction in the number of holes within the synthesized dot-in-rod NCs correlates with a decrease in the g factor. This conclusion was corroborated by theoretical calculations. Furthermore, the fabrication of chiral CdS-Au heterojunctions and the application of electron quenchers revealed that the reduction of the g factor also suggests the significant role of electrons in the generation of chirality. Our findings not only enhance the understanding of the fundamental origins of induced chirality effects in semiconductor NCs but also provide a clear methodology for the design of optimal optically active chiral NCs, thereby paving the way for future applications utilizing chiroptical materials.
研究领域:
纳米材料
·
半导体物理
·
手性光学材料
·
量子点
·
光电子学
·
表面化学
·
理论凝聚态物理
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产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2026
·
IF 5.9
Dongfang Zhao,Tianqi Li,Lihang Jiang,Zheng Li,Zhibo Li
The global accumulation of plastic waste underscores the urgent need for sustainable polymers that combine commodity feedstocks, controlled synthesis, and closed-loop recyclability. Substituted six-membered lactones represent promising poly(ether-alt-ester) precursors owing to their tunable properties and inherent degradability, yet their structural diversity and recycling pathways remain limited. Here, we report a catalyst-modulated route to regioselectively synthesize methyl-substituted six-membered lactones from commodity methyl glycolate (MG) and propylene oxide (PO), which are subsequently polymerized into poly(ether-alt-ester)s capable of efficient chemical depolymerization. The choice of catalyst dictates both monomer structures and polymer microstructure, while thermal and stereochemical analyses reveal how subtle substitution patterns govern amorphous or semicrystalline behavior of the resulting polymers. Chemical depolymerization regenerates either mixed or pure lactones, demonstrating true closed-loop recycling. By integrating catalyst design, control over monomer regioisomer distribution, polymer microstructure and reversible polymerization, this work establishes a versatile platform for constructing recyclable poly(ether-alt-ester) systems, advancing circularity within polymer materials.
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2026
·Vol. 40
·期 33
·18043-18052
·
IF 6
Pang Bo,Pu Baian,Peng Hao,Xue Kang,Shi Chengxiang,Gao Ruijie,Ai Minhua,Huang Zhen-Feng,Zhang Xiangwen,Zou Ji-Jun,Pan Lun
Conventional
high-energy-density hydrocarbon fuels face an intrinsic
trade-off between increasing ring number and decreasing net heat of
combustion. To address this limitation, we propose a synthetic strategy
based on tandem [4 + 2]/[2 + 1] cycloaddition. Norbornadiene and methyl
dicyclopentadiene were employed as feedstocks to develop a coupled
synthetic approach that combines Diels–Alder [4 + 2] cycloaddition
for constructing a polycyclic framework with Simmons–Smith
[2 + 1] cyclopropanation for energy enhancement. By optimizing the
reaction parameters, the Diels–Alder and Simmons–Smith
reactions achieved optimal conversions of 77.89% and 90.96%, respectively,
with selectivities of 43.54% and 85.82%. The resulting fuel fraction
exhibits a high density of 1.060 g cm –3 , a volumetric
net heat of combustion of 44.85 MJ L –1 , and a freezing
point below −60 ° C. This study demonstrates an effective
strategy for simultaneously achieving high density, high volumetric
energy content, and excellent low-temperature performance, providing
useful guidance for the molecular design and synthesis of next-generation
high-energy-density fuels.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Sijie Qiao,Zhicheng Shi,Yu Zhang,Gengrun Zhang,Zhiyu Huang,Annan He,Ming Chen,Guizhen Ke,Jia Yuan,Shichang Chen,Fengxiang Chen
Polyester (PET) fiber, also known as “the king of fibers”, is one of the fastest-developing, highest-yielding, and most widely-applied fibers among various synthetic fibers since 1960s and widely applications in clothing, carpets, and decorative fabrics due to its excellent properties such as high strength, stable dimensions, and chemical corrosion resistance. However, polyester fibers are fusible and flammable synthetic fibers. Meanwhile, PET fibers have poor hydrophilicity and are difficult to dye due to the compact molecular structure of PET and its semi-crystalline structural properties. The aforementioned shortcomings severely restrict their application in home furnishings, clothing, and industrial textiles. Herein, we firstly prepared the colorful PET fibers by depositing an ultra-thin and dense TiO 2 , Al 2 O 3 , and ZnO nano-film layer with the maximum thickness of ~1/100 of the fiber diameter via multi-pulse vapor phase infiltration (MPI) technology, respectively. As-prepared PET fibers successively produced beautiful yellow, blue, purple, green, and red bionic colors. The colors of the colored PET fibers can withstand tape tearing, washing, and ultraviolet (UV) irradiation and exhibiting an excellent color fastness. Most importantly, the colored PET fibers also exhibiting enhanced flame-retardant and anti-dripping properties. This work provides a new idea for the synergistic improvement of eco-coloring, flame retardant, and anti-dripping properties of PET fibers, which is expected to guide the functional fiber design for future innovations.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
纺织工程
·
高分子科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Zhang,Tonghe Xing,Zhiyu Huang,Annan He,Yuxin Luo,Ying Hong,Mengqi Wang,Zhicheng Shi,Aixin Tong,Sijie Qiao,Guizhen Ke,Tao Zhao,Fengxiang Chen,Weilin Xu
As a luxurious textile raw material, silk fiber (SF) and its products are widely favored by consumers because of their elegant appearance and excellent comfort. However, their flammability causes potential fire risks and hazards in daily fires and has gained significant attention in recent years. In this work, an ultrathin and uniform TiO 2 , Al 2 O 3 , and ZnO nanofilms with thicknesses of 1 ∼ 200 nm (less than one in a hundred of SF diameter) were deposited on the surface of a silk fabric (SFR) by atomic layer deposition (ALD). By tuning the types of metal oxides and nanofilm thickness, the modified SFR quickly self-extinguished, and its pristine weave was completely preserved after exposure to a flame in a torch burn test, representing superior performance compared to numerous conventional coating technologies reported with higher loadings. An expanded charcoal residue formed on the surface of the modified SFR, acting as a physical barrier that enhanced flame retardancy. Furthermore, the modified SFR showed excellent laundering durability, which helps improve the service life of the fabric. Most importantly, the nanofilms had a negligible impact on the intrinsic comfort and other comprehensive properties of the silk.
研究领域:
材料科学
·
纺织工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhiyu Huang,Aixin Tong,Tonghe Xing,Annan He,Yuxin Luo,Yu Zhang,Mengqi Wang,Sijie Qiao,Zhicheng Shi,Fengxiang Chen,Weilin Xu
Regenerated cellulose fibers has attracted increasing attention for high-grade textile raw materials and industrial textiles, but the low mechanical property caused by differences in regenerated raw materials and production levels limits its commercial application in the product diversity. Herein, we proposed a novel triple-crosslinking strategy by coupling with hydrogen bonds, chemical crosslinking, and internal mineralization from multiple pulsed vapor phase infiltration (MPI) to improve the mechanical performance of regenerated cellulose fibers. A binary solvent composed of ionic liquid (IL) and dimethyl sulfoxide (DMSO) is used to dissolve waste cotton textile and then wet spinning. Dual-crosslinking is firstly achieved by coupling glutaraldehyde (GA) and cellulose reaction. Subsequently, a metal oxide is intentionally infiltrated into inner cellulosic through MPI technology to form a third form of crosslinking, accompanied by the ultra-thin metal oxide nano-layer onto the surface of regenerated cellulose fibers. Results showed that the triple-crosslinking strategy has increased the tensile stress of the fiber by 43.57 % to 287.03 MPa. In all, triple-crosslinking strategy provides a theoretical basis and technical approach for the reinforcement of weak fibers in waste cotton recycling, which is expected to accelerate the development of the waste textile recycling industry and promote of the added-value of regenerated products.
研究领域:
材料科学
·
纺织工程
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yinghao Xu,Yaoqi Huang,Linfeng Li,Muyang Gu,Yuanyuan Li,Xiaomin Cheng
Phase change materials limit practical applications due to their relatively weak thermal conductivity and leakage resistance. The present work focuses on the development of a novel composite PCM (CA-TD/ZnO/EG), which was prepared by adsorbing a binary mixture of n-decanoic acid-tetradecanol (CA-TD) based on the combination of expanded graphite (EG) and zinc oxide (ZnO) nanoparticles. A new support material, ZnO/EG, was assembled by depositing specially shaped ZnO onto the surface of an expanded graphite substrate using an atomic deposition method. In addition to maintaining the porous structure of EG and preventing the leakage of CA-TD, the ZnO/EG reduces the interfacial thermal resistance between the substrate and the PCM molecules, which leads to the maximisation of the thermal conductivity. The prepared CA-TD/ZnO/EG-10 composite has a phase transition temperature of 19.5 °C, a heat of 157.3 J/g, and a thermal conductivity of (6.131 W·m -1 ·K -1 ) improved by 351.7% compared to the CA-TD material. Its faster heat transfer rate is directly reflected in the infrared image, with a small enthalpy change of 1.2% during 200 cycles of heating-cooling, as well as some photothermal conversion capability. The results of this paper can provide prospects for the functional design, modification, and enhancement of composite PCM.
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Bi Yuhe,Sun Jianhui,Cao Sheng,Li Qiuyan,Zheng Jinju,Yuan Xi,Wang Yunjun,Zou Bingsuo,Zhao Jialong
As next-generation display technologies, eco-friendly colloidal quantum dot light-emitting diodes have drawn great attention due to their excellent luminescence properties, along with their rapid development. However, practical applications of eco-friendly quantum dot light-emitting device remain challenging, primarily due to the inferior performance of green device, which still lag behind their red and blue counterparts. Herein, we present efficient green device based on interfacial potential-graded ZnSeTe quantum dots. Our findings show that this potential-graded structure alleviates interfacial lattice mismatch and strain, reducing structural deformation and misfit defects. The smoothed interfacial potential suppresses the nonradiative recombination processes, particularly Auger recombination revealed by excitation-intensity dependent ultrafast transient absorption kinetics. Consequently, the interfacial potential-graded quantum dots demonstrate highly efficient green quantum dot light-emitting diodes, with a peak external quantum efficiency of 21.7% at 520 nm and a corresponding current efficiency of 75.7 cd A −1 .
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Bo Chen,Wanmeng Wang,Meilin Hu,Yunkai Liang,Ning Wang,Changyi Li,Ying Li
The dental implant market has experienced explosive growth, owing to the widespread acceptance of implants as the core of oral rehabilitation. Clinically, achieving simultaneous anti-infective effects and rapid osseointegration is a crucial but challenging task for implants. The demand for implants with long-term broad-spectrum antibacterial and immune-osteogenic properties is growing. Existing methods are limited by a lack of safety, efficiency, short-lasting anti-infective ability, and inadequate consideration of the immunomodulatory effects on osteogenesis. Herein, a ZnO/black TiO2–x heterojunction surface structure was designed as a near-infrared (NIR) light-responsive nanofilm immobilized on a titanium (Ti) implant surface. This nanofilm introduces abundant oxygen vacancies and heterojunctions, which enhance the photothermal and photoelectric abilities of Ti implants under NIR illumination by narrowing the band gap and improving interfacial charge transfer. The “photo-thermo-electric” implant exhibits excellent broad-spectrum antibacterial efficacy against three dental pathogenic bacteria (Porphyromonas gingivalis, Fusobacterium nucleatum, and Staphylococcus aureus, >99.4%) by destroying the bacterial membrane and increasing the production of intracellular reactive oxygen species. Additionally, the implant can effectively eliminate mature multispecies biofilms and kill bacteria inside the biofilms under NIR irradiation. Meanwhile, this implant can also induce the pro-regenerative transformation of macrophages and promote osteoblast proliferation and differentiation. Moreover, in vivo results confirmed the superior antibacterial and osteoimmunomodulatory properties of this dental implant. RNA sequencing revealed that the underlying osteogenic mechanisms involve activation of the Wnt/β-catenin signaling pathway and bone development. Overall, this versatile “photo-thermo-electric” platform endows implants with anti-infection and bone integration performance simultaneously, which holds great potential for dental implants.
研究领域:
材料科学
·
生物材料
·
牙科材料
·
生物医学工程
·
免疫学
·
组织工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 34
·期 1
·104-110
·
IF 1.835
Liu Bo,Liu Dong-tao,Li Shi-hui,Sun Guang-ping,Cui Dong-mei
β -Iminophosphonamide ligated lanthanum bis(benzyl) complex (NPN Dipp )La(CH 2 Ph-4-Me) 2 (THF) (NPN Dipp = Ph 2 P(NC 6 H 3
i Pr 2 -2,6) 2 ), upon activation of AlEt 3 and [Ph 3 C][B(C 6 F 5 ) 4 ], exhibited high catalytic activity and high trans -1,4 stereoselectivity for the polymerization of bio-sourced β -myrcene (MY). Based on which, a series of novel trans -1,4 regulated elastomers could be generated by random/block copolymerization of MY and isoprene (IP).
研究领域:
高分子化学
·
生物材料
·
催化化学
✓ 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）