CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Dongliang Mao,Shuang Yin,Xia Fang,Yang Wang,Qvan Li,Jian Yang
By surface modification with APTMS, spontaneous coagulation casting (SCC) of fused silica based on Isobam was achieved and the possible coagulation and molding mechanism is proposed. Through the interaction between the polar groups on the Isobam molecular chain and the incorporated –NH 2 groups on the surface of the silica particles, Isobam molecular chains were adsorbed on the surface of particles, which initiate the formation of flocs and the solidification of the suspension. The addition of dispersant TMAH results in the hydrolyzation of Isobam, forming more –COO – , which effectively improves the fluidity and stability of the suspension. Then the zeta potential , rheological properties and coagulation behavior of the suspension were systematically investigated and the fused silica suspension with high solid content (up to 52 vol%), low viscosity and good coagulation properties were prepared at 1.8 wt% TMAH and 0.5 wt% Isobam dosage. After sintering at 1260 °C for 4 hours, the fused silica ceramics (50 vol% solid content) shows a high bending strength of 61.59 MPa, the lowest dielectric loss tanδ of 8.46×10 -4 and the dielectric constant of 3.72. Thus, this work provides a simple and effective method for preparing fused silica and other ceramics with negative surface charge by Isobam SCC.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
Nature Communications
·
2025
·
IF 15.7
Xiao-Rui Ren,Baichuan Kou,Qing Hao,Francesco Bertocchi,Ying Xu,Lu Wang,Zhen-Lian Zhao,Ting Chen,Li-Jun Wan,Dong Wang
Engineering symmetry breaking is a fertile ground to develop innovative materials with fascinating properties. Herein, we introduce crystallographically incompatible rotation element into two-dimensional polymers and construct twist-stacked covalent organic framework nanofibers (abbreviated as t -COFs). These t -COFs are derived from polymerization between 2,4,6-triformylphloroglucinol and diamines modulated by monodentate alkylamine. Comprehensive electron microscopy analysis reveals their well-defined fibrous morphology and twist-stacking details. The time-dependent growth process study discloses a new radial growth pattern, which enables t -COFs to inherit twist-stacking from hexagonal macrocycle nanotube intermediate. Intriguingly, the twist-stacking mode is found to be intrinsic when using amine modulator, and enantiomeric bias towards one stacking direction can be achieved using chiral amine. Disrupting the inversion symmetry, the consecutive regular rotation of COF layers endows COF nanofibers with structural chirality and large chiroptical response. Twisted two-dimensional materials are materials with fascinating properties. Here, the authors report on the incorporation of a crystallographically incompatible rotation element into two dimensional polymers to construct twist-stacked covalent organic framework nanofibers with interesting chiroptical properties.
研究领域:
材料科学
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纳米技术
·
超分子化学
·
手性材料
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高分子化学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 7
·990
·
IF 4.7
Kang Yang,Di Liu,Lei Feng,Liugen Xu,Yangang Jiang,Xiran Shen,Amjad Ali,Jianwei Lu,Li Guo
The development of nontoxic and efficient antifreeze agents for organ cryopreservation is crucial. However, the research remains highly challenging. In this study, we designed and synthesized a series of peptoid oligomers using the solid-phase submonomer synthesis method by mimicking the amphiphilic structures of antifreeze proteins (AFPs). The obtained peptoid oligomers showed excellent antifreeze properties, reducing the ice crystal growth rate and inhibiting ice recrystallization. The effects of the hydrophobicity and sequence of the peptoid side chains were also studied to reveal the structure–property relationship. The prepared peptoid oligomers were detected as non-cytotoxic and considered to be useful in the biological field. We hope that the peptoid oligomers presented in this study can provide effective strategies for the design of biological cryoprotectants for organ preservation in the future.
研究领域:
材料科学
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生物技术
·
低温生物学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Mengke Wang,Xi Zhang,Lei Liu,Xiaoyu Zhang,Jiahe Yan,Weihua Jin,Peng Zhang,Jun Wang
Two-dimensional organic–inorganic hybrid perovskites (OIHPs) have excellent photoelectric properties, such as high charge mobility and a high optical absorption coefficient, which have attracted enormous attention in the field of optoelectronic devices and photochemistry. However, the stability of 2D OIHPs in solution is deficient. In particular, the lack of stability in polar solutions hinders their application in photochemistry. In this work, (iso-BA)2PbI4 was used as a model to explore the three possibilities of the stable existence of a 2D perovskite in aqueous solution. And two of these systems that stabilize the presence of (iso-BA)2PbI4 were further investigated through electrochemical testing. Moreover, (iso-BA)2PbI4 2D hybrid perovskites exhibited an outstanding degradation rate. The chiral perovskite (R/S-MBA)2PbI4 is able to degrade a 30 mg/L methyl orange solution completely within 5 min, making it one of the fastest catalysts for this particular organic reaction. Further, based on the electron spin resonance test, a degradation mechanism by the halide perovskite was proposed. Based on the great catalytic performance as well as good reusability and stability, (R/S-MBA)2PbI4 perovskites are expected to be a new generation of catalysts, making a great impact on the application of asymmetrically catalyzed photoreactions.
研究领域:
材料科学
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光化学
·
催化
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产品关联
DOI
PubMed
高影响因子
Light-Science & Applications
·
2026
·Vol. 15
·期 1
·360
·
IF 24
Xu Yanming,Liu Yi,Yu Chao,Xu Jinlong,Huang Wenqi,Mo Weichu,Xu Canhua,Sun Zhihua,Huang Yantang,Cao Xun,Xie Zhenda,Lu Ruifeng
Directly full-color frequency-upconversion under high-order multiphoton absorption (MPA) nonlinearities in NIR-III (1550–1870 nm) and NIR-IV (2100–2300 nm) windows is highly desirable for advanced photonics and bioimaging. However, it has remained beyond the reach of current materials due to their inherently weak high-order MPA. Here, we demonstrate that, driven by Bloch oscillations of excitonic dipoles after nonlinear polarization, giant multiphoton nonlinearities can be achieved in layered hybrid perovskites to enable full-color upconversion in NIR-III/IV windows. The MPA cross-section values of the designed three Ruddlesden-Popper perovskites are found to be several orders of magnitude larger than those of the reported MPA materials. These advancements facilitate versatile applications previously inaccessible in NIR-III/IV windows, including full-color upconversion displays and multicolor information encryption. Our work highlights the prospect of efficient high-order MPA and opens avenues for investigating excitonic quantum dynamics in high-order nonlinear optics.
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DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 12
·1600
·
IF 4.9
Liugen Xu,Junwei Pi,Lei Feng,Junhao Wen,Minghai Zhao,Amjad Ali,Jianwei Lu,Li Guo
Glycopolypeptoids were synthesized and showed effective antifreeze activity, demonstrating their potential as novel antifreeze agents for cryopreservation. These polypeptide analogs offer improved stability and tunability compared with natural antifreeze glycoproteins (AFGPs) and existing synthetic mimics. Using the ring-opening polymerization of N-substituted N-carboxyanhydride monomers followed by click chemistry, glycopolypeptoids with controlled polymerization degrees and varied structures were designed and prepared. Their antifreeze performance was assessed via nanoliter osmometry and ice recrystallization inhibition assays, revealing a strong correlation between the molecular structure and antifreeze activity. The findings highlight glycopolypeptoids as a promising, cost-effective alternative to natural AFGPs, providing new insights into the development of biomimetic cryoprotectants. This study expands the understanding of synthetic antifreeze materials and offers a practical approach for improving cryopreservation efficiency in biomedical and industrial applications.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Bo Peng,Hongwei Lu,Shuai Gu,Juntao Tang,Chunyue Pan,Guipeng Yu
Highly selective nanofiltration membranes are ideal candidates for efficient water purification. However, achieving superior selectivity without sacrificing water permeance remains a considerable challenge. Drawing inspiration from the structural features of squid skin, a biomimetic strategy was devised that integrates cyclohexane-induced swelling with surface grafting employing hydrophilicity-tuned monomers to enhance the performance of polyamide thin-film composite membranes (PA-TFC). Remarkably, grafting with aminoacetaldehyde dimethyl acetal (ADA), the most hydrophilic monomer, effectively mimicked the natural hydration layer, thereby enabling rapid and unhindered water transport. Consequently, the resulting ADA-modified nanofiltration (ADA-NF) membrane exhibits an ultrahigh NaCl/Na 2 SO 4 separation factor of 263.2, while doubling the water permeance to 15.9 L m −2 h −1 bar −1 . Additionally, large-scale roll-to-roll production of this type of biomimetic nanofiltration membrane has been successfully demonstrated. The ADA-NF membrane exhibits significantly enhanced anti-fouling properties due to its tailored surface charges, while maintaining stable performance. The ADA-NF membrane offers a practical route to address the permeance-selectivity trade-off, while its fabrication strategy maintains a high degree of compatibility with existing industrial production lines. This unique biomimetic strategy provides valuable insights into the rational design of NF membranes for highly selective separation.
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DOI
高影响因子
POLYMER
·
2012
·
IF 3.438
Chunhui Luo,Bin Zhao,Zhibo Li
Four kinds of well defined poly( N -methacryloyl-L-amino acid)s were prepared via reversible addition fragmentation chain transfer polymerization . The effects of molecular structure, molecular weight , and end-group on their responsive properties in water were investigated. We found that the monomer structure is critical for the polymer to exhibit stimuli-responsive properties in water; only polymers derived from aspartic acid showed defined dual thermo- and pH-responsive properties. To study the effects of molecular weight and end group on the lower critical solution temperature behavior of poly( N -methacryloyl- L -β-isopropyl aspartic acid) (PMAIPAC), a series of PMAIPAC homopolymers with controlled molecular weights and narrow polydispersities were prepared and treated with excess radical initiators to give defined end groups. The cloud point of PMAIPAC was found to increase with the increase of solution pH, due to the ionization of carboxylic acid groups, and decrease with the increase of molecular weight. The structure of end groups also affects the cloud point of PMAIPAC particularly for low molecular weight samples at low pH.
研究领域:
高分子化学
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材料科学
·
胶体与表面化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 22
·13209-13219
·
IF 12.732
Bao Xiao,Qihao Sun,Fangbao Wang,Shiyao Wang,Bin-Bin Zhang,Junjie Wang,Wanqi Jie,Paul Sellin,Yadong Xu
Two-dimensional (2D) organic–inorganic hybrid halide perovskites have recently attracted extensive attention for electronic and optoelectronic applications due to their tunable properties and superior stability compared with their three-dimensional (3D) counterparts. Here, we report two kinds of organic cation (linear butylamine (BA) and branched isobutylamine (i-BA)) tailored CsPbBr3 crystals, namely (BA)2CsPb2Br7 and (i-BA)2CsPb2Br7, grown by the temperature-cooling method. The organic cations' adjustable anisotropic structure, optoelectronic properties and X-ray detection performance have been systematically investigated. By shortening the spacer cation from BA to i-BA, the degree of anisotropy in 2D perovskite crystals is decreased, which may be ascribed to the reduced interlayer distance and barrier height resulting from the enhanced electronic coupling between neighboring organic cations. In particular, the device based on the (BA)2CsPb2Br7 crystal along the ab plane exhibits superior X-ray sensitivity up to 13.26 mC Gy−1 cm−2 at a relatively low electric field of 2.53 V mm−1, owing to the multiple quantum well structure that restricts the charge carrier transport within the ab plane resulting in efficient charge collection. Simultaneously, a superior long-term working stability is obtained under a high X-ray dose rate of 278.4 μGy s−1. We anticipate that these findings will be helpful for the development of Ruddlesden–Popper perovskites for future research and applications.
研究领域:
材料科学
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光电子学
·
辐射探测技术
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产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 3
·339
·
IF 4.501
Li-Hua Du,Meng-Jie Yang,Yue Pan,Ling-Yan Zheng,Shi-Yi Zhang,Zhi-Kai Sheng,Ping-Feng Chen,Xi-Ping Luo
Coumarin carboxamide derivatives are important building blocks for organic synthesis and chemical biology due to their excellent biopharmaceutical properties. In this paper, we demonstrate for the first time a two-step enzymatic synthesis of coumarin carboxamide derivatives. Salicylaldehyde and dimethyl malonate were reacted to obtain coumarin carboxylate methyl derivatives, which were then reacted with various amines under the catalysis of lipase TL IM fromThermomyces lanuginosusto obtain coumarin carboxamide derivatives in continuous flow reactors. We studied various reaction parameters on the yields. The important features of this method include mild reaction conditions, a short reaction time (40 min), reduced environmental pollution, higher productivity (STY = 31.2941 g L−1h−1) and enzymes being relatively easy to obtain.Keywords:enzymatic synthesis;microreactor;coumarin carboxamide derivatives
研究领域:
有机化学
·
生物催化
·
药物化学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Xinyu Zhou,Xiaokai Su,Zhengzhong Tan,Chuncai Zhou
Antibacterial peptides as a novel antimicrobial agent have overwhelmingly caught researchers’ attention with unique superiority. Here, we report a series of triblock copolypeptides K 10 -b- F n -b- K 10 synthesized by sequential NCA ring-opening polymerization. The obtained triblock copolypeptides have good antibacterial efficacy against both S. aureus and E. coli . The hemolysis test has been conducted and it suggests that the triblock copolypeptides have low cytotoxicity and good biocompatibility. Furthermore, we present a systematic study on their self-assembly behavior and confirm that they can self-assemble into vesicles. Hence, such triblock copolypeptides have potential applications in antibacterial therapy and biomedical application field.
研究领域:
生物材料学
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微生物学
·
合成生物学
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产品关联
DOI
高影响因子
BIOPOLYMERS
·
2017
·Vol. 107
·期 11
·e23041
·
IF 1.908
Xiaokai Su,Xinyu Zhou,Zhengzhong Tan,Chuncai Zhou
A series of amphiphilic diblock copolypeptides (K 30 - b -F 15 , K 30 - b -F 30 , and K 30 - b -F 45 ) were synthesized via N -carboxy-α-amino-anhydride ring-opening polymerization. The copolypeptides had excellent antibacterial efficacy to both Gram positive ( S. aureus ) and Gram negative ( E. coli ) bacteria. The minimum inhibitory concentrations (MICs) against E. coli and S. aureus are 8 μg mL −1 and 2 μg mL −1 , respectively, lower than most natural and artificial antimicrobial peptides (AMPs). The morphological changes of the bacteria treated with diblock copolypeptides were investigated by transmission electron microscopy; the results proved that the diblock copolypeptides had a similar antibacterial pore-forming mechanism to natural cationic peptides. This was confirmed by laser scanning confocal microscope images. CCK-8 results and the MICs showed that the diblock copolypeptides have high selectivity to bacteria, which suggested that the diblock copolypeptides could be excellent candidates to replace traditional antibiotics in future. Graphical
研究领域:
生物材料学
·
微生物学
·
聚合物化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）