RSC Advances
·
2018
·Vol. 8
·期 35
·19642-19650
·
IF 2.936
Fancui Meng,Zhuangzhuang Qiao,Yan Yao,Jianbin Luo
Polyurethane with pendant azide groups on the soft segment (PU-GAP) was prepared in this study to further increase the content of reactive azide groups and improve their surfaces enrichment for further functionalization. Polymer diols with pendant azide groups (GAP) were prepared by transforming the pendant chlorine groups at polyepichlorohydrin (PECH) into azide groups with sodium azide. The prepared PECH, GAP and PU-GAP was characterized by GPC, 1H NMR and FTIR. Propargylic mPEG (mPEG-alkyne) was used as model surface modification reagents which was grafted on the prepared azido containing polyurethane films via click chemistry. The surface morphology, chemical composition and wettabilities were studied by SEM, XPS and water contact angle (WCA) analysis, respectively. SEM results demonstrated different surface topologies between mPEG modified PU surface and original PU surface. XPS and WCA analysis proved the successful grafting of mPEG on the pendant azide groups of PUs. The mPEG modified PU surfaces demonstrated good antifouling activities against model bacteria and mPEG with larger molecular weights modified surfaces showed better resistance efficiency to attachment of bacteria. Therefore, the surface reactive polyurethane we prepared can be a universal platform for further functionalization according actual applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Shujin Zhou,Kai Sheng,Na Zhang,Han Zhang,Hongguang Li,Panpan Sun,Xia Xin
Metal nanoclusters (NCs) have attracted much attention due to their ultrasmall sizes and unique electronic structures. In recent years, the light-induced reversible assembly of Au NCs is already reported. However, to achieve light-triggered reversible self-assembly of Cu NCs is still challenging. Herein, we prepared photoresponsive Cu NCs by using an azo-containing ligand, i.e., 3,5-dimethyl-4-(phenyldiazenyl)-1H-pyrazole) (abbreviated to Hazopz). Each nanocluster contains three Cu(I) in the core and has atomic precision (denoted as Cu 3 -NCs hereafter). Self-assembly of Cu 3 -NCs into nanofibers occurred in binary solvent mixture with toluene as a good solvent and methanol (MeOH) as a poor one. When the suspension containing the nanofibers was irradiated by UV light, the originally straight nanofibers became bent. This morphological change is mainly due to the isomerization of the peripheral azo groups of the Cu 3 -NCs from trans- to cis -conformation, and to a small extent ascribed to the increased solubility of the cis -conformation of the azo groups in the binary solvent. The disassembled aggregates can reassemble and the bent nanofibers can become straight again when exposed to visible light. This process can be repeated for at least three times, indicating the high reversibility of this light-triggered morphological change of Cu 3 -NCs. The one-dimensional self-assemblies with light-triggered, reversible morphological changes achieved in this work can be potentially used as a medium material in an optical information storage device, and can write and erase information through the irradiation of UV light and visible light.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 6
·1-11
·
IF 2.426
Qiu Xibo,Zhai Hong,Li Longfei,Dong Peng,Bai Ying,Peng Ai-Yun,Quan Daping
The intention of this work was to study the polymerization of a cyclic carbonate monomer bearing one azido group, i.e. 2-(azidemethyl)-2-methyltrimethylene carbonate (AMTC), to disclose the characteristics of the resulted polymers and to explore the feasibility of their post-functionalization with alkynyl compounds via Click reaction. Homopolymerization of AMTC was first studied using stannous octoate (Sn(Oct) 2 ) as the catalyst and dodecanol as the initiator, which had the characteristic of active polymerization. Copolymerization of AMTC with L -lactide ( L -LA) was then investigated under the same reaction condition, in which L- LA exhibited higher reactivity than AMTC. The reactivity of AMTC was low not only in its homopolymerization but also in its copolymerization with L -LA, while the conversion of AMTC increased by extending the reaction time. The copolymer P(AMTC-co- L LA) (PLAC) had the semicrystalline characteristic due to the relative long block-like segments of P L LA ( \( {\overline{L}}_{\mathrm{L}}=35.5 \) ). Based on these results, copolymerization of AMTC with L -LA using PEG 4K as macroinitiator was further studied to afford PLAC-PEG-PLAC copolymers. The copolymerization could be well controlled at low ratio of [M] 0 /[I] 0 (from 10 to 50) and molar fraction of AMTC in feed ( f AMTC = 0.1, 0.2). The pendent azido groups of PLAC-PEG-PLAC could undergo post-functionalization through azide-alkyne click reaction easily and efficiently.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2021
·
IF 0
Peng Wei,Hejuan Lou,Yifeng Zhang,Wei Zhang,Yawei Bian,Yumin Xia,Yanping Wang,Yimin Wang
In this study, three novel main-chain liquid-crystal polyurethanes based on mesogenic diol 4,4ʹ-bis(6-hydroxyhexoxy)biphenyl (BP6), azo diol 4,4ʹ-bis(6-hydroxyhexyloxy)-azobenzene (BHHAB) and 4,4ʹ-diisocyanato-3,3ʹ-dimethylbiphenyl (DMBDI) were synthesised via polyaddition method. The chemical structure, thermal properties, liquid-crystal behaviour and microstructure were fully characterised by FTIR, 1HNMR, UV spectrum, Differential scanning calorimetry (DSC), Thermogravimetric analyzer (TGA), Polarizing optical microscope (POM) and X-ray diffraction techniques. The resulted polyurethanes showed strong UV absorption at 313 nm ascribed to π–π* transition of azo group. All of the polyurethanes showed multiple transitions on DSC curve, which could be ascribed to crystal, melting and isotropization transitions combined with the POM observation. The thermal degradation of the polymers occurred at much higher temperatures (325–331°C) than the melting ones (144–154°C), making the melt processing feasible. The polyurethane showed semicrystalline structure based on diffraction and DSC results. The obtained polyurethanes exhibited smectic mesophase as verified by variable temperature WAXD results, and the mesophase temperature range was more than 25°C based on the POM observation. The obtained polyurethanes could be potentially used in optical and smart intelligence material area.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 25
·11380-11389
·
IF 3.591
Rui Yang,Yifei Liu,Zhen Dong,Haiyan Li,Zhiwen Ye
As an environmentally friendly energetic group, the azide group can not only control the melting point but also increase the energy of the compound. Therefore, the design and synthesis of energetic compounds with azido groups have long been a focus of research in the field of energetic materials. 3-R-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan energetic materials were synthesized and fully characterized. Using computational chemistry methods, the interactions of some compounds were studied, and the physical and chemical properties of all of compounds were examined. The results show that 3-amino-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan (2) has a melting point similar to that of TNT and can be a potential carrier for molten-cast explosives. Hydroxylamine salt (4) has an excellent detonation velocity and detonation pressure of 9090 m s−1 and 35.76 GPa, respectively, and its energy is significantly higher than that of RDX, enabling replacement of RDX as a high-energy explosive. Although the detonation performance of compound 4 is slightly lower than that of HMX, its sensitivity is better than that of HMX, which shows that compound 4 still has a high application value. Non-covalent interactions (NCIs) and Hirshfeld surface models indicate that hydrogen bonding and π–π interactions are the key factors that reduce the sensitivity of compounds. Therefore, our results for 3-R-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan energetic materials suggest that it may be competitive for application in both molten-cast explosives and high-energy explosives.
研究领域:
化学
·
材料科学
·
爆炸物研究
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2024
·
IF 5.5
Lei Luo,Fei Liu,Zhiying Li,Siyuan Yue,Liang Wang,Shiling Zhang,Shanmeng Lin,Jinyan Luo,Meng Wang,Yichuan Zhang,Mohamed Abdelrahim,Qi Xing,Jin Geng
Nanoparticles (NPs) containing light-responsive polymers and imaging agents show great promise for controlled drug delivery. However, most light-responsive NPs rely on short-wavelength excitation, resulting in poor tissue penetration and potential cytotoxicity. Moreover, excessively sensitive NPs may prematurely release drugs during storage and circulation, diminishing their efficacy and causing off-target toxicity. Herein, we report visible-light-responsive NPs composed of an amphiphilic block copolymer containing responsive 4-acrylamide benzenesulfonyl azide (ABSA) and hydrophilic N,N′-dimethylacrylamide (DMA) units. The polymer pDMA-ABSA was loaded with the chemotherapy drug dasatinib and zinc tetraphenylporphyrin (ZnTPP). ZnTPP acted as an imaging reagent and a photosensitizer to reduce ABSA upon visible light irradiation, converting hydrophobic units to hydrophilic units and disrupting NPs to trigger drug release. These NPs enabled real-time fluorescence imaging in cells and exhibited synergistic chemophotodynamic therapy against multiple cancer cell lines. Our light-responsive NP platform holds great promise for controlled drug delivery and cancer theranostics, circumventing the limitations of traditional photosensitive nanosystems.
研究领域:
材料科学
·
药学
·
生物医学工程
·
纳米技术
·
癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Youhuan Zhu,Pengpeng Chen,Yifeng Zhou,Wangyan Nie,Ying Xu
Sustainable alkaline metal ion batteries using organic electrodes are promising for large-scale renewable energy storage. Traditional anode compounds are always anchored with harmful aromatic rings , which results in high toxicity. In this work, a series of aromatics-free organic electrode material based on an azo group is applied in alkaline metal ion batteries . Lithium-, sodium- and potassium-ion batteries based on acyclic compound 2, 2′-azobis(2-methylpropionitrile) (AIBN) as an anode material exhibit low toxicity. In situ Raman and ex situ Fourier-transform infrared spectroscopy results reveal that the azo group serves as the electrochemical active site for the reversible insertion and extraction of alkaline metal ions. Another compound with low toxic, 2,2′-azobis(2-methylpropionamidine) dihydrochloride (AIBA), which containing two active sites of azo and imine groups confirmed with in situ Raman and ex situ FT-IR, are applied in lithium-ion batteries. Furthermore, harmless sodium ion battery has been assembled with azodicarbonamide (CONH). Therefore, this acyclic compound offers possibilities in novel organic electrode materials for developing toxin-free and environmental-friendly alkaline metal ion batteries.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Huajing Zhou,Jun Luo,Yuancai Chen
Ethylenediaminetetraacetic acid (EDTA) could form stable complexes with toxic metals such as nickel due to its strong chelation. In this study, with the same doping level of Co and N, MoO 2 and ZIF-67 were used as precursors to prepare MoO 2 @Co/N and FeC@Co/N electrocatalysts for the modified graphite felt cathodes in heterogeneous-electro-Fenton-like reaction (HEFL) system. The X-ray diffraction and X-ray photoelectron spectroscopy results indicated that both of the catalysts are dominated with pyridinic N (2.42% and 2.82%) upon co-doping Co/N, and FeC@Co/N exhibited an obviously higher additional sp -hybridized nitrogen ( sp -N) peak. The co-doping of Co/N induced the lattice modifications to produce more lattice defects, where pyridinic N and sp -N, related with the active sites (C–N, Co-Nx), were formed at near-ring defects along sheet edges through the nitrogen replacement of C C groups. FeC@Co/N demonstrated superior oxygen reduction reaction catalytic activity in terms of Cyclic Voltammetry and Rotating Ring-disk Electrode, and exhibited the remarkably higher current density (30 mA) and lower onset potential (−0.208 V) in Linear Sweep Voltammetry analysis. In the FeC@Co/N/CF modified HEFL system, despite the generated H 2 O 2 concentrations (62.5 mg L −1 ) is not very high, the reducing reaction of ≡Fe(III)/Co(III)–OH could get the electron directly from the cathode, which would greatly reduce the consumption of H 2 O 2, high utilization efficiency of H 2 O 2 (η: 87.63%) could greatly improve the EDTA-Ni removal (97.5%) and TOC (92.6%). This work demonstrates the feasibility of utilizing FeC@Co/N/CF as a cathode for breaking metal-complex in HEFL process.
研究领域:
环境科学
·
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Haili Zhao,Tao Chen,Tong Wu,Linsheng Xie,Yulu Ma,Jin Sha
Functional surfaces that enable both spatial and temporal control of biomolecules immobilization have attracted enormous attention for various fields including smart biointerface materials, high-throughput bioarrays, and fundamental research in the biosciences. Here, a flexible and promising method was presented for regulating the spatiotemporal arrangement of multiple biomolecules by constructing the topographically and chemically diverse polymer brushes patterned surfaces. A series of polymer brushes patterned surfaces, including antifouling brushes patterned surface, epoxy-presenting brushes patterned surface without and with antifouling background layer, were fabricated to control the spatial distribution of protein and cell adhesion through specific and nonspecific means. The fluorescence measurements demonstrated the effectiveness of spatially regulating the density of surface-immobilized protein through controlling the areal thickness of the poly (glycidyl methacrylate) (PGMA) brush patterns, leading to various complex patterns featuring well-defined biomolecule concentration gradients. Furthermore, a multiplexed surface bearing epoxy groups and azido groups with various areal densities was fabricated for regulating the spatiotemporal arrangement of different proteins, enabling binary biomolecules patterns with higher degrees of functionality and complexity. The presented strategy for the spatiotemporal control of biomolecules immobilization would boost the development of dynamic and multifunctional biosystems.
研究领域:
智能生物界面材料
·
高通量生物芯片
·
生物科学
✓ 已验证
DOI
PubMed
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Lu Wang,Qiong Wu,Baozheng Zhao,Zelin Li,Yuehong Zhang,Lang Huang,Shitao Yu
Carbon aerogels are prepared by a thermal treating-freeze drying approach from chitosan, with glycine hydrochloride ionic liquid (IL) acting as solvent and nitrogen source. Different post-treatments such as ball milling and high temperature carbonization are employed to functionalize the obtained carbon aerogels with tuned properties, making it promising candidates as fluorescence material (NACs-Q), electrode material (FDC-800) and catalyst support (NAC Pd -C). NACs-Q is water-soluble quantum dot with average particle sizes of 3.8 nm, presenting excitation-/emission-independent and pH-sensitive properties, which could be used as sensor for testing acetone vapor or an “on-off-on” sensor for detections of Fe 3+ and vitamin C in fruits. FDC-800 exhibits fluffy lamellar structure with developed micro-mesopores and nitrogen-containing groups on their surfaces, which is beneficial for building flexible solid-state supercapacitor with excellent performance, delivering a capacitance of 208F/g at 0.5 A/g, and achieving an energy density of 7.2 W h/kg at a power density of 50 W/kg. Moreover, NAC Pd -C can be used as catalyst for phenol hydrogenation, and phenol conversion of 100% with cyclohexanone selectivity of 98.3% is achieved, due to the synergetic effects of the Pd active-site, the N -containing groups, and the Lewis acid sites on the support.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
环境科学
·
分析化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Wenpeng Gong,Li Zhang,Ying Yu,Bixia Lin,Yumin Wang,Manli Guo,Yujuan Cao
Hydrogen sulfide is typical metabolic marker and environmental pollutant which is worthwhile to determine. Herein, a low background and high sensitivity fluorescent strategy based on double modifications of metal organic framework material CAU-10-NH 2 is proposed for the determination of hydrogen sulfide. Firstly, a functional monomer 3,5-diaminobenzoic acid is employed to modify on the CAU-10-NH 2 , the product CAU-10-NH-dAba has strong fluorescent performance at 412 nm under an excitation wavelength of 320 nm. Subsequently, it is further modified by the azide group to form CAU-10-NH-dAba-N 3 . This azidation inhibits the fluorescent signal. However, in the presence of hydrogen sulfide, the azide group is specifically reduced to amidogen, and results in the recovery of the fluorescence. The CAU-10-NH-DABA-N 3 was characterized by solid state NMR , XPS, fluorescence, IR, XRD, SEM and specific surface area. After the optimization of pH value, temperature and interaction time, the detection results of hydrogen sulfide demonstrate the linear range of this strategy is from 20 to 140 nM with a detection limit of 1.51 nM, which is significantly better than that of the CAU-10-NH 2 merely modified by 3,5-dinitrobenzoic acid. Meanwhile, the satisfactory assay results of hydrogen sulfide in serum sample and Pearl river water suggest a potential application prospect of this strategy in clinical diagnosis and environment monitoring.
研究领域:
分析化学
·
环境科学
·
材料科学
·
生物化学
✓ 已验证
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）