JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2026
·
IF 2.7
Muhammad Owais Malik,Li Wang,Haojie Yu,Muhammad Haroon,Lei Zhang,Dileep Ahmad,Khan Manqoosh Awan,Abdul Basit,Saqlain Raza
Ammonium perchlorate (AP) is commonly used as an oxidizer in composite solid propellant (CSP) and its decomposition temperature directly affects the combustion performance of CSP. Adding burning rate catalysts (BRCs) is the most effective way to catalyze the thermal decomposition of AP and increase the burning rate (BR) of CSP. Ferrocene (Fc) and its derivatives are the hot choice of scientists to use as BRCs but controlling its migration in CSP on prolonged storage still remains a challenge, which can lead to a catastrophic situation. Here, we synthesized six Fc-based morpholine (Fc-MPNs) compounds to catalyze the thermal decomposition of AP and address the migration problem. Several spectroscopic techniques, including 1 H NMR, FT-IR and UV–visible spectroscopy were used to confirm the structures of the prepared Fc-MPNs. The results revealed that amongst all the prepared catalysts, Fc-MPN-6 showed the best anti-migration performance and Fc-MPN-3 showed the superior catalytic performance. Cyclic voltammetry (CV) studies showed efficient electron transfer. Combustion test exhibited improved flame morphology and BR. Scanning electron microscopy (SEM) analysis of the combusted products provided insights into the morphology of the combusted products. Notably, the synthesized Fc-MPNs showed better performance in comparison with Fc and Cat, highlighting their potential applications in spacecraft propulsion and missile systems.
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高影响因子
ENERGY & FUELS
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2025
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IF 5.3
Xiu Chen,Ying Zhang,Haidong Li,Quan Shi,Suoqi Zhao,Linzhou Zhang
Vanadyl porphyrins, which have central metals in the form of cations, are liable to coordinate axially with basic ligands. In the presented paper, the interaction behaviors of vanadyl octaethylporphyrin (VOOEP) with different basic ligands, viz. amines and N-heterocycles (such as pyridine, morpholine, n-butylamine, triethylamine, diethylamine, azetidine, and pyrrolidine), have been studied in detail through ultraviolet–visible (UV–vis) spectroscopy, collision-induced dissociation (CID) combined with Orbitrap mass spectrometry (MS), and density functional theory (DFT). The axial coordination ability and binding preference of VOOEP and ligands, as well as the relative stability, binding energies, and absorption spectra of the VOOEP-ligand complexes, were fully characterized in this study. The complexes involved two types of binding forms: axial coordination bonding and hydrogen bonding. It was observed that the axial coordination between VOOEP and basic ligands resulted in a decrease in intensity and red-shift of the UV–vis Soret band compared to pure VOOEP. Moreover, the axial coordination is closely correlated to the basicity and steric hindrance of the ligands. The relative stability and binding energies of the complexes are positively related to the basicity of the ligands. Additionally, besides VOOEP-ligand complexes (1:1 adducts), VOOEP-VOOEP-ligand complexes (2:1 adducts) were also observed and studied. This work offers insights that may aid petrochemists in the separation, enrichment, or selective removal of vanadyl porphyrins from petroleum samples and the investigation of porphyrin-asphaltene association behavior.
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POLYMER
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2023
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IF 4.6
Ke Wang,Liru An,Ganghui Lu,Jialu Zhang,Zilong Wang,Meiyu Si,Guiyan Liu,Yongfei Zeng
A series of novel thermo/pH/CO 2 -triple responsive homopolymers were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. These homopolymers contain ethoxy groups , and the end substituents are pyrrolidine , piperidine , N -methylpiperazine, morpholine and thiomorpholine , respectively. The effects of different heterocyclic substituents on the responsiveness of temperature, pH and CO 2 were studied. For temperature-response, it was found that the lower critical solution temperature (LCST)-type cloud point (CP) temperature decreased as the number of carbon atoms increases, while the solubility of the polymers changed greatly with the introduction of oxygen, nitrogen and sulfur atoms. And the CP of the polymers can be adjusted by molecular weight , concentration and salt. Furthermore, some of these polymers present upper critical solution temperature (UCST) behavior in alcohols. For pH-response, the initial pH of the polymer solution is different, their critical pH changed accordingly, and is affected by temperature; in addition, changing the pH of solution can also affect the CP. For CO 2 -response, all of the polymers were completely soluble after pumping with CO 2 , and their LCST behavior recovered after N 2 was pumped in, but there was a gap with the initial CP. The study of these properties reveals the influence of different heterocyclic substituents on the responsiveness of polymers, which is of great significance for understanding the stimulation response properties of polymers and provides ideas for the design of new stimuli-responsive polymers.
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MATERIALS RESEARCH INNOVATIONS
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2023
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IF 0
Qiong Yao,Shouwu Yu
A triazine long chain charring agent (TCA) was synthesised using cyanuric chloride, morpholine and anhydrous piperazine. The synthesised TCA was compounded with ammonium polyphosphate (APP) to obtain an intumescent flame retardant (IFR). When the TCA content in the IFR was 35 wt% to 45 wt%, the IFR had good expansion properties. Then, different proportions of IFR were incorporated into polypropylene (PP) to prepare flame retardant PP composites, and the flame retardancy, thermal degradation behaviour and flammability behaviour for PP composites were investigated by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test. When 20 wt% of IFR (With TCA 35 wt%) were added into the PP matrix, the composite achieved a V-0 rating for the UL-94 test and its LOI value was increased to 28.8%. Compared with neat PP, peak heat release rate (PHRR) and total heat release (THR) decreased from 827.30(KW·m−2) and 120.48(MJ·m−2) to 210.50(KW·m−2) and 75.08(MJ·m−2).
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CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 59
·e202302132
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IF 4.3
Jun-Tao Shi,Xian-Hui Chen,Yuan-Yuan Peng,Gui-Ping Wang,Guang-Yan Du,Quan Li
Graphical A novel mechanically bonded amphiphile (MBA)-bistable [2]rotaxane H2 was designed and prepared. In both the solution and aggregated states, H2 demonstrated pH-responsive emissions due to the presence of a distance-dependent photoinduced electron transfer (PET) process. Moreover, the morphology of H2 aggregates can be tuned from nanospheres to vesicles due to the pH-controlled shuttling motion-induced alternation of H2 amphiphilicity. Advanced Organic Chemical Materials Co-constructed Mechanically bonded amphiphiles (MBAs), also known as mechanically interlocked molecules (MIMs), have emerged as an important kind of functional building block for the construction of artificial molecular machines and soft materials. Herein, a novel MBA, i. e., bistable [2]rotaxane H2 was designed and synthesized. In the solution state, H2 demonstrated pH and metal ion-responsive emissions due to the presence of a distance-dependent photoinduced electron transfer (PET) process and the fluorescence resonance energy transfer (FRET) process, respectively. Importantly, the amphiphilic feature of H2 has endowed it with unique self-assembly capability, and nanospheres were obtained in a mixed H 2 O/CH 3 CN solvent. Moreover, the morphology of H2 aggregates can be tuned from nanospheres to vesicles due to the pH-controlled shuttling motion-induced alternation of H2 amphiphilicity. Interestingly, larger spheres with novel pearl-chain-like structures from H2 were observed after adding stoichiometric Zn 2+ . In particular, H2 shows pH-responsive emissions in its aggregation state, allowing the visualization of the shuttling movement by just naked eyes. It is assumed that the well-designed [2]rotaxane, and particularly the proposed concept of MBA shown here, will further enrich the families of MIMs, offering prospects for synthesizing more MIMs with novel assembly capabilities and bottom-up building dynamic smart materials with unprecedented functions.
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高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 42
·e202202620
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IF 2.307
Siyuan Li,Xianrong Yu,Linlin Zeng,Yuhan Xu,Xiaolan Zhao,Wei Tang,Xinrui Duan
Graphical A lysosomal-targeted ratiometric ICT fluorescent probe TCF-LysopH with ideal p K a value (6.12), large Stokes shift (110 nm), and good photostability was developed for real-time tracking lysosomal pH changes during heatstroke. The lysosome is the typical acidic organelle involved in many biological processes, the fluctuation of its pH influences its normal digestive function and even the fate of the cells. To conveniently detect and visualize lysosomal pH changes during heatstroke, we designed and synthesized a lysosomal-targeted ratiometric pH-sensitive fluorescent probe TCF-LysopH. TCF-LysopH showed an ideal p K a value (p K a =6.12) in the lysosomal pH range during heatstroke (5.00–7.00), rapid response for the changes of pH in real-time, reversible pH switching ability, good selectivity, low cytotoxicity, and excellent lysosome-targeting ability. The large Stokes shift of 110 nm allows us to apply the probe for fluorescence imaging in MCF-7 cells. The probe has much better photostability (only less than 20 % decrease in intensity for 15 min irradiation) than LysoTracker Green. The fluorescence intensity became higher with the increase of pH, which is consistent with the tendency of the lysosomal pH change during heatstroke. Importantly, TCF-LysopH was applied to measure the change of lysosomal pH during heatstroke in live cells, the results prove once again that the pH of the lysosome is increased during heatstroke. Thus, TCF-LysopH was successfully developed as a practical and useful tool to provide a better understanding of the complicated mechanisms between lysosome pH change and heatstroke.
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MOLECULES
·
2021
·Vol. 26
·期 21
·6526
·
IF 4.412
Caiyun Lin,Yuying Li,Weishan Tang,Shufeng Zhou,Xiaoping Rao
Supramolecular hydrogels have attracted great attention due to their special properties. In this research, bio-based supramolecular hydrogels were conveniently constructed by heating and ultrasounding two components of dehydroabietic acid with a rigid tricyclic hydrophenanthrene skeleton and morpholine. The microstructures and properties of hydrogels were investigated by DSC, rheology, SAXS, CD spectroscopy, and cryo-TEM, respectively. The critical gel concentration (CGC) of the hydrogel was 0.3 mol·L−1and the gel temperature was 115 °C. In addition, the hydrogel showed good stability and mechanical properties according to rheology results. Cryo-TEM images reveal that the microstructure of hydrogel is fibrous meshes; its corresponding mechanism has been studied using FT-IR spectra. Additionally, oil-in-water gel emulsions were prepared by the hydrogel at a concentration above its CGC, and the oil mass fraction of the oil-in-water gel emulsions could be freely adjusted between 5% and 70%. This work provides a convenient way to prepare bio-based supramolecular hydrogels and provides a new method for the application of rosin.Keywords:bio-based;supramolecular hydrogels;dehydroabietic acid;oil-in-water;gel emulsions
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高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 4
·858-865
·
IF 7.804
Xinxin Li,Qingshan Zhao,Xiang Feng,Lei Pan,Zhuangzhuang Wu,Xiaocui Wu,Tianwen Ma,Jialiang Liu,Yuanyuan Pan,Yan Song,Mingbo Wu
Graphical Nitrogen-doped graphene nanoshells supporting palladium nanoparticles (Pd/N-GNS) have been developed as a superior catalyst for the N -allylation reaction. Experimental results and DFT calculations reveal strong metal–support interactions between the pyridinic N and palladium species, which significantly boost the catalytic efficiency and stability of the catalyst. In this study, nitrogen-doped graphene nanoshells (N-GNS) were developed to support palladium nanoparticles (Pd/N-GNS) as an efficient and recyclable catalyst for the N -allylation reaction. N-GNS was synthesized through a facile hard-template method by using petroleum asphalt, followed by nitrogen doping by thermal annealing with urea, the contents and species of which could be altered by the calcination temperature. Palladium nanoparticles (Pd NPs) with an average diameter of 3.3 nm were homogeneously deposited onto the N-GNS support through a mild solvent-growth approach. The Pd/N-GNS exhibited a superior activity towards the N -allylation reaction, 6-fold higher than that of the pristine graphene nanoshells supporting the palladium catalyst. The Pd/N-GNS could be recycled several times without activity deterioration and metal leaching. The catalytic activity showed a linear correlation relationship with the pyridinic N content. Experimental and theoretical studies reveal strong metal–support interactions between the pyridinic N and palladium species, which can downsize the Pd NPs, modulate the electronic properties, and promote the adsorption of reactant, thereby significantly boosting the catalytic efficiency and stability for the N -allylation process. The present work could help unravel the roles of nitrogen-doped carbon supports and provides a feasible strategy to rationally design superior palladium catalysts for chemical transformations.
研究领域:
材料科学
·
催化化学
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jun Mou,Xingqi Fan,Fei Liu,Xiaodan Wang,Tianxiang Zhao,Peng Chen,Ziwei Li,Chunliang Yang,Jianxin Cao
The direct conversion of CO 2 hydrogenation to lower olefins via methanol as an intermediate is of great significance, but challenges still remain. Herein, we present a binary Mn 2 O 3 -ZnO oxide, which is responsible for catalytic hydrogenation of CO 2 to methanol. After combination of Mn 2 O 3 -ZnO and SAPO-34 molecular sieve, the catalytic reaction displays a markable increase. CO 2 adsorption by alkaline nature, followed by oxygen vacancy activation and synergistic hydrogenation over the binary Mn 2 O 3 -ZnO oxide are the prerequisites for the tandem reaction. However, the tandem spacing between oxide and molecular sieve plays a crucial role, because the suitable intimacy can induce enhanced methanol formation as intermediate via tandem dynamics effect, causing an apparent limitation for reverse water gas shift reaction at high temperature. The optimum mass ratio of 3:1 for two phases demonstrates that more components of binary oxide are needed to improve the rate of CO 2 hydrogenation to methanol, aiming to balance the two-step tandem reaction. Finally, under conditions of 380 ℃, 3 MPa and 3600 mL/g cat /h, 20%Mn 2 O 3 -ZnO/SAPO-34 tandem catalyst is obtained by physical ball milling after 15 min, with excellent stability, sulfur tolerance and catalytic performance with CO 2 conversion at almost 30%, lower olefins selectivity of 80.2% (propylene/ethylene = 5.6:1), and single-pass yield of 10.7%.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingnan Liu,Yaqing Xiao,Minghui Shang,Yuting Zhuang,Li Wang
The method of monitoring the freshness of seafood is not satisfactory for ensuring food safety. Here, we develop a filter membrane-based smart fluorescent tag with excellent biogenic amine response, which can monitor the freshness of seafood in real time and visually. We use green fluorescent fluorescein as an indicator and red fluorescent carbon quantum dots (RQDs) with aggregation-induced emission property as an internal reference. After simple mixing, they are deposited on the commercial filter membrane by physical deposition method to prepare the fluorescent tag. When amine molecules are present, the molecular conformation of fluorescein changes and the fluorescence increases rapidly, while RQDs have no obvious response, thus achieving a clear fluorescence color response to biogenic amines. Under UV light of 254 nm and 365 nm, the fluorescent tag showed sensitive, rapid, and color-responsive to ammonia in a wide range of 250–2.5 × 10 4 ppm. To further verify the practical application potential, the fluorescent tag was used to monitor the freshness of shrimp and crab in situ in real time, and satisfactory results were achieved. More importantly, owing to the reversible conformational change of fluorescein, the fluorescent tag can be reused and manufactured at low cost, making it a more attractive platform for freshness monitoring in the field of food safety.
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ACS Applied Bio Materials
·
2020
·
IF 0
Faming Wang,Pengfei Ren,Katrien V. Bernaerts,Yifu Fu,Wanjun Hu,Naizhen Zhou,Tianzhu Zhang
As one of the nonenzymatic cell-harvesting technologies, a thermal-responsive surface based on poly(2-oxazoline)s has achieved initial success in supporting the adhesion and thermal-induced detachment of animal cells. However, because of the laborious preparation procedure, this technique was only limited to research purposes. In this work, through using poly(glycidyl methacrylate) (PGMA) as the anchor layer, poly(2-propyl-2-oxazoline)s (PPOx) were grafted onto glass wafers through a facile two-step coating and annealing procedure for nonenzymatic cell harvesting. In the first step, the piranha solution-activated glass wafers were immersed into the chloroform solution of PGMA and then annealed for a given period of time to immobilize PGMA onto the glass wafers through the bonding between epoxy groups and hydroxyl groups. In the second step, the PGMA-coated glass wafers were further immersed into the chloroform solution of carboxyl-functionalized PPOx. After annealing, PPOx were immobilized onto the PGMA layer through the bonding between carboxyl groups and the residual epoxy groups. Atomic force microscopy, X-ray photoelectron spectroscopy, and ellipsometry were used to characterize the modified glass wafers. The results of cytocompatibility evaluation showed that the PPOx-coated glass wafers were almost nontoxic and were able to support the adhesion and proliferation of L929 cells well. By lowering the temperature to 8 °C, L929 and Vero cells were successfully detached from the PPOx-coated glass wafers without any enzymatic treatment. Further cultivation has demonstrated that the cooling procedure had little effect on cell viability, and the cells still retained good viability after harvesting.
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PubMed
Micro & Nano Letters
·
2019
·Vol. 14
·期 11
·1151-1156
·
IF 0.975
Min Shi,Yanhong Li,Hongtao Cui
A facile strategy for the preparation of composites with homogeneous distribution of multi-walled carbon nanotubes (MWCNTs) in Ni(OH) 2 was proposed. The electrostatic attraction between positively charged Ni(OH) 2 monolayer nanosheets and negatively charged MWCNTs was utilised to self-assemble the composites. The results of electrochemical measurement on the composite containing 30 wt% MWCNTs indicated that the homogeneous composition of MWCNTs in composite significantly reduced the electrical resistance and promoted the electrochemical utilisation of Ni(OH) 2 . As a result, the composite presented high electrochemical performance: having specific capacitance of 1568.8 F g −1 at low current density of 2.4 A g −1 and keeping a relatively high specific capacitance of 781.8 F g −1 at high current density of 81.7 A g −1 . Based on the results in this works, it is hoped that the adopted strategy could provide a promising idea for the preparation of composites with homogeneous distribution of individual components.
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危险品化学品经营许可证（带存储）