POLYMER
·
2016
·
IF 3.586
Liao Peng,Zilin Wang,Anchao Feng,Meng Huo,Tommy Fang,Ke Wang,Yen Wei,Jinying Yuan
Research interest in electrochemical redox stimulus has grown considerably due to its easy trigger mode, in which the linkers have played important roles, such as the β-cyclodextrin-ferrocene (β-CD-Fc) linker. Star amphiphilic copolymers with well-defined and flexible structures are considered to be excellent choices for drug delivery systems (DDSs). Driven by the idea that using star polymers to improve the biocompatibility and efficiency of the β-CD-Fc-based DDS, we designed and synthesized star polymer 4 arm-poly(ε-caprolactone)-β-CD ( 4A PCL-CD ) and linear polymer polyethylene glycol-Fc ( PEG-Fc ). They can form supramolecular block copolymer 4A PCL-CD / Fc-PEG and self-assemble to micelles , which are electrochemical responsive and can be applied as drug carriers for potential controlled release, with higher efficiency and better biocompatibility compared with their linear analogues.
研究领域:
材料科学
·
药物递送系统
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Xia Xia,Haojie Yu,Li Wang,Zheng Deng,Kenneth J. Shea,Zain-ul-Abdin
A series of redox- and photo-responsive copolymers, poly(2-(methacryloyloxy)ethyl ferrocenecarboxylate- co -4-methacryloylamino-4′-nitroazobenzene) (P(FcEMA- co -MAAzo)s) were synthesized using free radical polymerization. The synthesized copolymers were characterized by 1 H NMR, FT-IR, gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). Cyclic voltammetry (CV) and Ultraviolet–visible (UV–vis) absorption studies showed redox- and photo-responsive properties of the synthesized copolymers in the solution. P(FcEMA- co -MAAzo)s films were prepared by spin-coating or drop-coating method and these films were found to be redox- and photo-responsive. The color of the prepared films could be adjusted by the redox stimulus, while UV–vis absorption properties of the prepared films could be adjusted by changing wavelength of light. It was found that these synthesized films show potential application for high density information storage.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 61
·38691-38698
·
IF 3.108
Bin Li,Wubin Wu,Tianyong Zhang,Shuang Jiang,Xingwei Chen,Guanghui Zhang,Xia Zhang
UiO-66 with high dispersibility and a cuboctahedron morphology was synthesized by an improved solvothermal method. The morphology of UiO-66 was adjusted using benzoic acid as a modulator. UiO-66 with a regular morphology was then used as the support to load ferrocene (Fc). A series of Fc@UiO-66 composites were prepared via a facile impregnation method. The composites were characterized by powder X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), SEM/EDX mapping, FT-IR, UV/vis, TG analysis, N2 adsorption–desorption, and X-ray photoelectron spectroscopy (XPS). The results showed that Fc was incorporated into UiO-66, thus preventing the agglomeration of Fc particles in water. The Fc@UiO-66 composites with a Fc loading of 5% (FU-5) exhibited the highest catalytic activity for hydroxylation of phenol with H2O2 at room temperature in water, which gave a phenol conversion of 38.5% and 87.4% selectivity for dihydroxybenzenes (DHB). UiO-66 played a crucial role in the enhancement of catalytic performance compared with conventional supports such as γ-Al2O3, etc. A hydroxyl radical mechanism was proposed for this catalytic hydroxylation process and the high selectivity was attributed to the interaction between Fc particles and UiO-66.
研究领域:
化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2018
·
IF 3.193
Yi Wen,Zhou Cheng,Wenxiong Li,Zhi Li,Duijun Liao,Xiaoping Hu,Ning Pan,Deyi Wang,T. Richard Hull
A novel oligomer (PFDCHQ) based on 9,10-dihydro-9-oxa-10-phosphaphenanthrene −10-oxide (DOPO) and ferrocene groups was synthesized successfully, aiming at improving the flame retardant efficiency of diglycidyl ether of bisphenol A epoxy resin (DGEBA). FTIR , 1 H NMR and 31 P NMR were used to confirm the chemical structure of PFDCHQ. The high char yields of 60.3 wt% and 20.1 wt% were obtained for PFDCHQ from TGA results in nitrogen and air atmosphere, respectively. The thermal degradation mechanism of PFDCHQ was investigated by TG-FTIR and Py-GC/MS. The limiting oxygen index (LOI) of EP-5 with 5 wt% loading of PFDCHQ increased to 32.0% and the UL-94 V-0 rating was achieved, showing a notable blowing-out effect. In contrast to EP-0, the peak of the heat release rate (pHRR) and total heat release (THR) of EP-5 decreased by 18.0% and 10.3%. The flame retardant mechanism of PFDCHQ in epoxy resin was studied by TG-FTIR, SEM and Raman. SEM and Raman results indicated the formation of coherent and dense char residue with high degree of graphitization due to the incorporation of PFDCHQ. In UL-94, the blowing-out effect dominantly accounted for the enhanced flame retardancy in combination with optimized char structure. Furthermore, the addition of PFDCHQ improved the Young's modulus compared to EP-0.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Chaofan Zhou,Jinghang Wang,Hewen Liu
Free-standing 2D polymer materials with graphene-like crystalline layers hold great promise for many state-of-art applications. However, their fabrication remains challenging. A ferrocene tethered cyclopolymer (pFcMMA) is synthesized via the free radical polymerization of a divinyl monomer in this work. PFcMMA has a high degree of cyclization, but is not a stereo-regular structure like most vinyl polymers synthesized in free radical polymerization . PFcMMA can crystallize on the surface to form 2D crystals, which is evidenced by the birefringence phenomena, DSC and XRD analysis, and microscopic observation. Powder XRD of crystalline pFcMMA shows sharp interlayer diffraction, indicative of a highly crystalline phase. The crystallization process is supposed to follow the nonclassic crystallization pathway, i.e. the orientation of cyclopolymer main chains followed by the conformation transition of the side groups to form 2D crystalline layers. Variable temperature XRD combined with DSC analysis and polarizing optical microscopic observation demonstrate that the 2D crystalline phase begins to transition to a 3D crystalline phase at about 45 °C, the latter has a melting point at about 60 °C. The solid-solid crystalline transition is reversible and without intermediate melting, and the 2D crystalline phase is more stable at room temperature than the 3D phase. It is rationalized that nucleation from solutions is predominantly an entropy-driven process, while interactions between side groups and those between far separated main chains also benefit the formation of 2D crystalline phase. The commonalities of the crystallization processes of cyclopolymers are discussed.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yihan Zhen,Cuijuan Zhang,Yongdan Li
The non-aqueous redox flow battery (NARFB) is a very promising technology for the grid-scale energy storage; however, its wide application is seriously limited by the cycling stability. Here, we designed a ferrocene derivative by imidazole-functionalization and grafting an oligoether chain, 1-ferrocenylmethyl-3-(2-(2-(2-methoxyethoxy)ethoxy)ethyl) imidazolium-bis(trifluoromethylsulfonyl)imide (FcMITEGTFSI). The imidazolium cationic group induces a positive shift in the redox potential of the ferrocene core whilst ensuring the stability of the active species; the flexible oligoether side chain renders the molecule a liquid at room temperature (25 °C) and miscible with acetonitrile solvent. The flow battery shows robust cycling stability, with an overall discharge capacity retention of ≈95.5% after 200 cycles, corresponding to a capacity retention of ≈99.98% per cycle at 25 mA cm −2 with 0.1 M electrolyte.
研究领域:
能源存储技术
·
电化学材料
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2023
·Vol. 148
·期 4
·919-925
·
IF 4.2
Tai Wen,Junyao Li,Wenrong Cai,Baozhu Yang,Yong Kong,Zheng-Zhi Yin
An electrochemical chiral sensing platform based on a multi-substituted ferrocene–cuprous ion (Cu+) complex is constructed for the discrimination of electroactive amino acid (AA) isomers. Due to the opposite configurations of the AA isomers, the developed multi-substituted ferrocene–Cu+ can preferably combine with a right-handed AA (D-AA) isomer to form the ternary complex of multi-substituted ferrocene–Cu+-D-AA through π–π interactions, resulting in higher peak currents of D-AA. Therefore, the isomers of electroactive AA can be successfully discriminated. Among the tested electroactive AA isomers, the chiral sensing platform exhibits higher discrimination capability toward the isomers of tryptophan (Trp) than that of tyrosine (Tyr) and cysteine (Cys), which might be ascribed to the stronger π–π interactions between the benzene ring of the multi-substituted ferrocene and the indole ring of the Trp isomers.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·
IF 2.5
Ma Yukun,Zhao Hui,Shu Ronglu,Zhang Cunshe,Wang Wei
Supercapattery has drawn attention due to its superior tip-discharge efficiency and high energy density without affecting the cycle stability compared to conventional batteries and supercapacitors (SCs). Redox-active porous organic polymers (POPs) are regarded as promising energy storage materials due to the presence of overlapped π-electron clouds between the stacked layers, conjugated backbone, and high-rate charge transfer channels. However, single POPs material has fewer electroactive sites resulting from the broad and ordered π-π stacking in the network structure, limiting their corresponding electrochemical performance. In the present paper, Schiff base polymers containing ferrocene (Fc) and carbon nanotubes (CNTs) were prepared by one pot synthesis method for high-performance supercapattery. The microstructure studies exhibit that the CNTs were combined with the amorphous Schiff base polymer backbone. Moreover, the charge storage mechanism was discussed in detail. The electrochemical properties studies present that the sample (SPOP-Fc 0.4 /CNTs-5) possess the maximal specific capacitance (201.3 mAh g −1 ) at 0.5 A g −1 and the excellent specific capacity retention (retaining 84.3% of initial capacitance after 5000 GCD cycles at the current density of 10 A g −1 ). The enhanced performance shown by SPOP-Fc 0.4 /CNTs-5 was attributed to the synergy produced by the redox behavior and conjugated backbone provided by SPOP, the doping of Fc, and high-speed ion transport channels provided by CNTs. To evaluate the practicability of electrode materials, the asymmetric supercapattery devices (ASC) were assembled in a configuration of the SPOP-Fc 0.4 /CNTs-5//activated carbon (AC). SPOP-Fc 0.4 /CNTs-5//AC delivered a superb energy density of 65.9 Wh kg −1 with a power density of 344.8 W kg −1 while remaining almost 73.6% of the specific capacitance even after 5000 continuous GCD cycles. These Schiff-based POPs with advanced electrochemical capabilities deliver a fresh solution for material selection in energy storage, present extensively apply prospects in energy storage field.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuanjun Liu,Yuyu Liu,Binbin Li,Xingmei Guo,Junhao Zhang,Guoxing Zhu
Rational reconstruction of oxygen evolution reaction (OER) pre-catalysts and the performance index is crucial but still challenging. Herein, a coordination compound composed by ferrocenedicarboxylic acid and Co 2+ was prepared, which was then treated by NaBH 4 solution for the rational reconstruction. The electrochemical activation of the treated product results in the generation of oxyhydroxides with unique microstructure acting as the catalytic active phase, which exhibits excellent electrocatalytic activity with a low overpotential of 256 mV for 10 mA cm −2 towards OER and a half-wave potential of 0.69 V ( vs RHE) for oxygen reduction (ORR). Ru species was then loaded on the treated product to further improve the catalytic activity for oxygen reduction. The annealed product (Ru-CoFe/C) presents a core-shell structure with carbon layer on the surface. The product presents an increased half-wave potential of 0.744 V ( vs RHE) for ORR with the OER/ORR overpotential gap of 0.776 V for 10 and 1 mA cm −2 , respectively, showing the bifunctional catalytic activity. Ru species with small size improves the catalytic activity for ORR; the carbon shell provides the high stability. A Zn-air battery was then fabricated with the Ru-CoFe/C catalyst, which delivers a high power density of 88 mW cm −2 and a large specific capacity of 709 mAh g −1 , as well as an excellent cycling stability over 65 h, surpassing commercial Pt/C + RuO 2 based counterpart, demonstrating its feasibility in the field of renewable electronic devices. This work affords valuable guidelines for the application of ferrocene-based materials in OER and for the exploring of advanced bifunctional ORR/OER catalysts in rational construction of high-quality Zn-air batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Haiwei Tan,Hongyan Yao,Ying Song,Shiyang Zhu,Huaxuan Yu,Shaowei Guan
In this work, a novel tetra-amine, bis (4-(3, 5-bis (4-amino-2-(trifluoromethyl) phenoxy) phenoxy) phenyl) methanone, was synthesized and then utilized to produce hyperbranched polyamic acids via polycondensation with 4, 4’-(hexafluoroisopropylidene) diphthalic anhydride (6FDA). The resulting hyperbranched polyamic acids underwent termination by (4-amino) phenyl ferrocene and imidization, leading to ferrocene-terminated hyperbranched polyimide (HBPI-Fc). The resulting HBPI-Fc displayed superior solubility in conventional organic solvents and excellent thermal stability. A memory device with a configuration of indium tin oxide (ITO)/HBPI-Fc/Al was fabricated, in which the HBPI-Fc acted as the active layer. The device exhibited bistable electrical conductivity switching and nonvolatile bipolar write-once-read-many-times memory character with two threshold voltages of 2.2 V and −2.6 V, respectively, during positive and negative voltage sweep. The device exhibited an ON/OFF current ratio of 10 4 under a constant bias of −1.0 V and good stability in both ON- and OFF-state during the test period of 10 4 s. The revealed electrical bistability of the HBPI-Fc was found mainly due to the effective charge trapping effect of the electroactive terminal ferrocene groups.
研究领域:
材料科学
·
电子工程
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yongjiang Yuan,Xinming Du,Hongyu Zhang,Hui Wang,Zhe Wang
The main obstacle of anion exchange membrane fuel cell is the unsatisfactory performance of its key component anion exchange membrane. The AEMs functionalized with organometallic cations have excellent stability and comprehensive performance. Here, we report a series of durable poly (isatin biphenylene) membranes with [Cp-Fe-toluene]+organometallic cation, which have a durability of 1000 h in 1 M KOH at 60 °C, and the hydroxide conductivity of the membrane still remains 81.4%. At the same time, it has excellent dimensional stability (20.55%) and mechanical properties (56.42 MPa). Based on our rational design of [Cp-Fe-toluene]+functionalized poly (isatin biphenylene) membranes, the single cell with this membrane exhibits the peak energy density of 64.4 mW cm −2 in H 2 -air (CO 2 -free) at 60 °C. All these suggest that anion exchange membranes containing metal organic cations have potential.
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ORGANOMETALLICS
·
2018
·
IF 4.051
Chu Tang,Yang Du,Qian Liang,Zhen Cheng,Jie Tian
Owing to the lack of target-directed therapies, triple-negative breast cancer (TNBC) is difficult to effectively treat. In this article, a novel organometallic histone deacetylase (HDAC) inhibitor, Fc-SelSA, based on the selenocyanide (SelSA) zinc-binding motif, was synthesized using a ferrocenyl group as the cap to confer activity against TNBC. The synthesized Fc-SelSA was evaluated for bioactivity in vitro and in vivo. An enzymatic assay showed that Fc-SelSA was a potent HDAC inhibitor with a half-maximum inhibitory concentration (IC50) of 14.8 nM. Molecular docking studies of Fc-SelSA with HDAC suggested that the ferrocenyl unit overlaps with the phenyl group of suberoylanilide hydroxamic acid (SAHA) and the amido group of Fc-SelSA can form hydrogen bonds with the D98 and G151 residues of HDAC, but SAHA and SelSA do not show similar interactions. Moreover, Fc-SelSA reactivated the estrogen receptor alpha (ERα) expression, sensitized TNBC cells to the antagonist tamoxifen, and exerted more potent antitumor effects against TNBC MDA-MB-231 tumor xenografts in comparison to SelSA with no obvious side effects. Our results indicate that Fc-SelSA is a potent oral anticancer candidate for HDAC-targeted TNBC therapy and deserves further investigation for clinical application.
研究领域:
肿瘤学
·
药理学
·
分子生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）