JOURNAL OF NUCLEAR MATERIALS
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2017
·
IF 2.048
Kuibao Zhang,Dan Yin,Le Peng,Jingjun Wu,Jiali Xue
In this study, zirconolite/Mo composites were rapidly synthesized by a self-propagation reaction that uses MoO 3 as the oxidant accompanied with pressing. Zirconolite is one of the several materials that are being researched as host for lanthanides and actinides in nuclear waste . Nd was used in this study as a surrogate for actinides and was substituted into zirconolite at a stoichiometric ratio to charge balance the Ca and Zr sites (nominal formulation of Ca 1-x Zr 1-x Nd 2x Ti 2 O 7 ). Perovskite , zirconia, and rutile were generated as the minor phases with the addition of Nd 2 O 3 . The XRD results demonstrated that the Nd 2 O 3 loading is approximately 30 wt%. Nd was mainly incorporated into the lattice structure of zirconolite and perovskite. A 42-day leaching test of the Nd-bearing zirconolite/Mo composite showed that the computed normalized leaching rates for Ca and Nd at fairly low values of 9.02 × 10 −2 and 2.10 × 10 −4 g m −2 d −1 , respectively.
研究领域:
材料科学
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核废物管理
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DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 18
·5624-5636
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IF 4.019
Long Zhao,Zhanlin Zhang,Maohua Chen,Yuan Liu,Tao Wang,Xiaohong Li
Challenges remain in the facile, rapid and sensitive detection of substances at ultralow levels. In the current study, visual sensors of hydrogen peroxide (H2O2) and choline are developed via the integration of an ultrafine fibrous substrate and self-propagating and aggregation-induced emission (AIE) probes. Self-immolative probes (SIPs) composed of phenylboronic acid triggers and choline units are grafted on electrospun polyethylene terephthalate (PET) fibers, followed by electrostatic adsorption of tetraphenylethene derivatives (TPE-SO3) to obtain fluorescent PET-Ch/TPE fibers. Choline oxidase (ChOX) is immobilized on polystyrene-co-maleic anhydride (PSMA) fibers to obtain PSMA-ChOX, followed by assembly into PET-Ch/TPE@PSMA-ChOX composite mats. The presence of H2O2 initiates the cleavage of phenylboronic acid triggers in SIPs to release choline and choline/TPE complexes from PET-Ch/TPE fibers. The released choline is oxidized by PSMA-ChOX fibers to generate H2O2 that then activates a cascade of self-propagating reactions until the release of all choline/TPE complexes, leading to the alleviation of AIE effect and gradual fluorescence fading of fibrous mats. Thus, the hydrogen peroxide and choline concentrations can be read out from the fluorescence fading time of fibrous mats with a detection limit of 0.5 μM H2O2 within 30 min, providing potential self-test devices for a real-time, naked-eye and sensitive detection of bioactive substances.
研究领域:
生物化学
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分析化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 5
·期 34
·18221-18229
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IF 8.867
Chu Liang,Sheng Liang,Yang Xia,Yun Chen,Hui Huang,Yongping Gan,Xinyong Tao,Jun Zhang,Wenkui Zhang
Hierarchical porous carbon (HPC) has attracted much attention in tackling global environmental and energy problems. For the state-of-the-art routes to synthesize HPC from organic compounds, the emission of carbon dioxide (CO2) and gaseous pollutants is inevitable during thermal carbonization. Herein, we report an environmentally benign and high-yield route to synthesize HPC from CO2via H2O-induced self-propagating reactions. By introducing an initiator of H2O, CO2 can react with lithium hydride (LiH) to produce HPC in 13 seconds at low temperatures. The as-synthesized HPC exhibits an interconnected micro–meso–macropore network structure with a high porosity of 83%. The formation mechanism of HPC is discussed on the basis of the conversion reactions from CO2 to C and the gas blowing effect in producing hierarchical porosity. The HPC evaluated as an anode material for lithium-ion batteries not only delivers a high reversible capacity of ∼1150 mA h g−1 at a current density of 0.2 A g−1, but also exhibits superior rate capability (∼825 mA h g−1 at 1.0 A g−1) and excellent cycling properties (up to 2000 cycles). This research opens a new avenue both to synthesize HPC from CO2 on a large scale and to mitigate greenhouse gas from the atmosphere.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2017
·Vol. 23
·期 59
·14883-14888
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IF 5.317
Chao Ding,Zhengqing Yan,Jinsong Ren,Xiaogang Qu
Graphical Please respond ! pH-Responsive polymer surfaces that are capable of transforming specific local fleeting stimuli into global macroscopic property changes were designed by the introduction of self-propagating reactions into polymer-surface systems (see figure). The H + -responsive polymer surfaces can be employed for antibacterial applications, and this design strategy offers methods for achieving autonomously reconfigurable materials. Stimuli-responsive polymer materials inspired by biological materials have invoked increasing research interest; however, they still suffer from limitations such as finite amplified responses and poor sensitivity of the unstimulated parts. Herein, a new strategy for creating H + -responsive polymer surfaces that are capable of transforming specific local fleeting stimuli into global macroscopic changes is described. The introduction of self-propagating reactions into the polymer-surface systems endows them with excellent stimuli-amplifying properties and response of the unstimulated parts. On the basis of this design, a polymer and enzymatic reaction were employed to enable a specific response to a stimulus and then lead to macroscopic changes of the surface. It is further shown that the prepared H + -responsive polymer surfaces can be employed for antibacterial application. This work provides a good example of achieving autonomously reconfigurable materials that respond to local fleeting stimuli.
研究领域:
材料科学
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生物医学工程
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高分子化学
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产品关联
DOI
PubMed
高影响因子
VACUUM
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2019
·
IF 2.515
Peng Deng,Hui Ren,Qingjie Jiao
Ammonium perchlorate-based molecular perovskite (DAP)/graphene energetic composite was prepared and characterized. Molecule perovskite DAP was synthesized by the one-pot reaction of ammonium perchlorate, perchloric acid, and triethylenediamine, and DAP/graphene energetic composite was fabricated by physical mixing. The results suggested functionalized graphene can contribute to the improvement of combustion properties of DAP effectively. The energetic composite have high sustained exothermic capacity as well as good self-propagating combustion performance. Synergistic catalysis combustion mechanism of the composite system was provided based on relay-domino-like reactions, which enhanced heat and mass transfer between each component and promoted energy release. This work maybe offer a new idea for design and fabrication of high performance graphene-based energetic composite.
研究领域:
材料科学
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含能材料
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燃烧工程
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2024
·
IF 4.5
Jiongfeng Sun,Yi Hong,Guofu Qiao
The synthesis and processing of most polymer adhesives rely on energy-inefficient and environmentally burdensome manufacturing approaches. In this paper, a novel synthesis strategy, UV-initiated frontal polymerization (FP) for the fast synthesis of high-strength, self-propagating epoxy adhesives at room temperature, was presented, in which the self-propagating rate reached 71.4 mm min −1 . CuCl 2 was used as a catalyst to decrease the onset temperature of polymerization and ensure sufficient polymerization on the surface of the material to be bonded. Mild steel, glass, ceramic, wood, PMAA, and concrete were successfully bonded within several minutes at room temperature. In the same material system, the adhesive strength with the FP curing approach was greater than that of thermal curing, and the former had a better pore structure , as determined by MIP analysis. This paper provides a promising idea for the in-situ fast synthesis of high-strength epoxy adhesives at room temperature.
研究领域:
材料科学
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高分子化学
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粘接技术
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产品关联
DOI
高影响因子
Materials Advances
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2024
·
IF 5.2
Aiqiong Wang,Jianxiong Li,Xiaoming Zhao
The bandwidth of microwave interference (MWI) has broadened with the increase of portable and intelligent electronics properties due to the diversification of irradiation frequencies. To shield against MWI over a broadened bandwidth, a coral-like polyaniline (PANI)/CoFe2O4 (CFO) nanocomposite (PCF) microwave absorber (MWA) was synthesized using a sol–gel self-propagation combustion method and annealing process. Computer simulation technology in CST MWS® accurately obtains the optimal thickness for the broadest-bandwidth MWA. The results demonstrated that the minimal reflection loss (RLmin) of the coral-like nano-PCF was −61.4 dB at 13.4 GHz with a thickness of 1.96 mm. Further optimization revealed that the effective absorbing bandwidth (EAB) of the coral-like nano-PCF was 6.4 GHz with a thickness of 1.74 mm, and the RL curve obtained from the simulation was in good agreement with the corresponding RL curve obtained experimentally. The strategy provides a new approach for the accurate design of broad-bandwidth MWAs.
研究领域:
材料科学
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电磁工程
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纳米技术
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产品关联
DOI
高影响因子
Small Methods
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2024
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IF 10.7
Jiongfeng Sun,Rui Wang,Guangjie Xue,Guofu Qiao
Concrete, in particular application scenarios, such as crack repair, disaster rescue and relief, and 3D printing, needs to be cured quickly. In this work, a novel synthesis strategy, UV-initiated frontal polymerization (FP), for fast preparation of high-strength polymer concrete at room temperature is proposed, and the whole fabrication progress within several minutes, in which coarse aggregates and a small amount of short carbon fibers (CF) are used to enhance mechanical properties and heat conduction and reduce the amounts of chemical adhesives. SEM, DSC, MIP, Ultra depth of field microscope, and Rheometer are employed to characterize the properties of chemical adhesives, polymer concrete, and polymerization process. In addition, the finite element method is used to investigate the internal temperature field status of the FP process. The results indicate that the compressive and flexural strengths of the polymer concrete with 1.0 wt%-1 mm-CF-50 vol.%-quartz sand exceeded 70 and 20 MPa, respectively, in which the average self-propagation velocity reached 58 mm min −1 . The investigation provides a promising approach for the rapid construction of structural facilities, emergency repair after disasters, 3D printing concrete, etc.
研究领域:
材料科学
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土木工程
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聚合物化学
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建筑技术
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灾害管理
·
3D打印
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产品关联
DOI
PubMed
高影响因子
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