PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 10
·e202300149
·
IF 1.8
Chao Shi,Liang Hu,Xinhang Liu,Lang Chen
This work is aimed to develop a stable Mg-based thermite with high iodine concentration and preliminarily set a method to test inactivation factor (IF) values of biocidal materials with proximity to the combat situation. First, Mg−I 2 composites were mechanochemically prepared and up to 10 wt% of iodine could be retained until the material heated to 265 °C. Then biocidal thermites were mechanochemically prepared using Mg−I 2 as a fuel and Ca(IO 3 ) 2 as an oxidizer. For Mg−I 2 −Ca(IO 3 ) 2 thermites, apparent aging was observed in the material with a stoichiometric fuel-to-oxidizer ratio. In heated filament ignition tests, thermites had ignition temperatures of ~760 °C and ~820 °C at heating rates of 1800 K/s and 13000 K/s, respectively, and were slightly lower than that of pure Mg. Particle combustion test showed that the thermite with more fuel fraction burned faster. A setup based on the constant volume explosion experiment was established to test the inactivation effect of biocidal materials. Results showed that pure Mg had the best inactivation effect, and IF value doesn't have a clear correlation with max pressure achieved by explosions of biocidal materials. For results within the same max pressure range, IF value is proportional to the iodine concentration within the materials. Interestingly, for Mg, IF value was exponentially changed with max pressurization rate, this leads to the unexpected high IF value of Mg. This study shows excessive iodine or oxidizer could deactivate the biocidal material, and the heat release rate may play a crucial role in biocidal performance.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhikai Liu,Mei Yang,Qiankun Zhao,Chaoqun Yao,Guangwen Chen
In this study, a seamless scale-up strategy for the antisolvent precipitation process was developed using a series of ultrasonic microreactors (USMRs). The key principle of this scale-up strategy was to maintain a constant mixing time, ensuring consistent nanoparticle (NP) production across different scales. First, lab- and production-scale USMRs were developed, enabling the customization of reactors to varying ultrasound frequencies, channel diameters, and power outputs. Then, the distinct cavitation patterns, including array, slug cluster and cluster, along with their corresponding mixing performances were studied in nine USMRs. By establishing a comprehensive map of cavitation patterns, primary factors affecting the formation of cavitation patterns were identified. Among the three cavitation patterns, the slug cluster pattern demonstrated the best mixing performance, wherein cavitation bubbles effectively occupied the channel and traversed rapidly across the cross-section. To guide the operation of USMRs under the slug cluster pattern, a tailored mixing model was developed. This model, in combination with the relationship between NP size and mixing time, enabled the successful seamless scale-up production of 55 nm PLGA-PEG NPs, with a required mixing time of 27 ms. This USMR-based scale-up strategy facilitated efficient process screening with low sample consumption (2 mL/min, 200 μL/sample) as well as high-throughput production (100 mL/min, 30 g/h).
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BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Caixia Sun,Xue Zhang,Hao Huang,Ya Liu,Xianwei Mo,Yufei Feng,Jiahong Wang,Wenhua Zhou,Paul K. Chu,Xue-Feng Yu,Wenxin Liu
Nanozymes with enzyme-like characteristics have drawn wide interest but the catalytic activity and substrate selectivity of nanozymes still need improvement. Herein, Se-vacancy-rich TiSe 2-x @Au nanocomposites are designed and demonstrated as nanozymes. The TiSe 2-x @Au nanocomposites show excellent peroxidase-like activity and the chromogenic substrate p-phenylenediamine (PPD) can be selectively oxidized to compounds that exhibit an absorption peak at 413 nm that differs from that of self-oxidation or generally oxidized species, suggesting high catalytic activity and strong substrate selectivity. Theoretical calculations reveal that the PPD adsorption geometry at Se vacancies with an adsorption energy of −3.00 eV shows a unique spatial configuration and charge distribution , thereby inhibiting the free reaction and promoting both the activity and selectivity in PPD oxidation . The TiSe 2-x @Au colorimetric system exhibits a wide linear range of 0.015 mM–0.6 mM and a low detection limit of 0.0037 mM in the detection of glucose. The blood glucose detection performance for human serum samples is comparable to that of a commercial glucose meter in the hospital (relative standard deviation < 6%). Our findings demonstrate a new strategy for rapid and accurate detection of blood glucose and our results provide insights into the future design of nanozymes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xuemei Li,Yang Shen,Fangyu Jin,Jingbo Zhang,Yanyan Yang,Xiaoshu Qu
Nuclear waste management and nuclear energy generation require the proper disposal of 129 I and 131 I, which are radioactive isotopes of iodine. For recognition of different types’ iodine, a magnetic poly (ionic liquid)s (Fe 3 O 4 @SiO 2 -MPS-PILs) was formed by the selected imidazole ionic liquid monomer and core–shell Fe 3 O 4 @SiO 2 -MPS via free radical polymerization. The resulting adsorbent containing plenty of imidazole N-heterocycle units, benzene rings, and ionic bonds in the backbones was suitable for simultaneously adsorbing iodine molecules and iodide ions. The adsorption mechanisms for iodine in cyclohexane and iodide ions from aqueous solution were based on charge transfer and ion exchange mechanisms, respectively. The adsorption equilibrium for iodine in cyclohexane was attained at 12 h, and the kinetics of iodine adsorption closely followed the pseudo-second-order model. Iodine adsorption on Fe 3 O 4 @SiO 2 -MPS-PILs was best described by Langmuir model with a maximum iodine adsorption capacity of approximately 714.29 mg g −1 . Iodide ions adsorption was best explained with Freundlich model and a maximum adsorption capacity of 335.80 mg g −1 was achieved in an iodide solution with a 500 mg L –1 concentration. Notably, Fe 3 O 4 @SiO 2 -MPS-PILs retained over 90 % of its original adsorption performance after the 5th cycle. This work proves that the adsorbent Fe 3 O 4 @SiO 2 -MPS-PILs was efficient and recyclable, and has good application prospects in the practical treatment of iodine and iodide.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·392-400
·
IF 5.693
Zeng Xiangyang,Luo Qiang,Li Jinyang,Li Yilan,Wang Wei,Li Yunhong,Wu Ronggen,Pan Duo,Song Gang,Li Jianbao,Guo Zhanhu,Wang Ning
Counter electrode at the cathode side of sensitized solar cells (SSCs) plays a critical key role in determining the device performance. Active and stable counter electrodes that can work over a wide range of electrolyte systems are highly desired for SSCs. Here, we report a mixed ternary pentlandite, Ni 3 Co 6 S 8 , as an efficient multifunctional counter electrode for SSCs with various redox mediators (I 3 − /I − , T 2 /T − , Co(bpy) 3 3+/2+ and S n 2− /S 2− ). Ni 3 Co 6 S 8 shows not only similar catalytic activity to Pt for I 3 − /I − redox shuttle but also superior catalytic activity for T 2 /T − , Co(bpy) 3 3+/2+ , and S n 2− /S 2− redox mediators. Furthermore, SSCs assembled with Ni 3 Co 6 S 8 also exhibit good performance preservation in conjunction with various electrolyte systems. This work highlights that SSCs are fully compatible with pentlandites and paves the way towards the realization of high efficiency and stable SSCs. Graphical abstract Ni 3 Co 6 S 8 demonstrates excellent catalytic activity towards various redox mediators, highlighting the full compatibility of pentlandites with sensitized solar cells.
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DRUG DELIVERY
·
2021
·
IF 6.419
Tao Liu,Guowei Li,Xidong Wu,Shaohua Chen,Siyi Zhang,Hong Han,Hongbin Zhang,Xiaoning Luo,Xiang Cai,Dong Ma
Chronic rhinosinusitis (CRS) is a rather prevalent condition with a chronic inflammatory process, which is hard to cure. Herein, a new antibacterial drug, nitric oxide (NO), was used for the attempt on CRS therapy. To achieve this, a star copolymer (β-CD-PAMAM) consisting of the β-cyclodextrin (β-CD) core and seven PAMAM-G3 arms, which was designed as a low-cytotoxicity and high NO loading carrier, were synthesized and characterizied. The obtained β-CD-PAMAM/NONOate showed the effect in inhibiting and dispersing the biofilm of S. aureus, as well as the effective antibacterial performance, implying the promising application in CRS treatment. The in vivo assay confirmed that β-CD-PAMAM/NONOate displayed excellent therapy effect on CRS and significantly improved the symptoms of the experimental rats, which was no significant different in therapy effect with the clinical Rhinocort. Incorporated with its little toxicity in vitro and in vivo, the β-CD-PAMAM/NONOate was suggested a promising application in CRS therapy.
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FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Jiawei Xie,Chengxiang Shi,Yunxiao Zhao,Lun Pan,Xiangwen Zhang,Ji-Jun Zou
Design and choice of fuels continue to be improved for aviation propulsion, and alkyl adamantanes have attracted great attention due to their high density, good low-temperature properties and potential characteristics. Herein, we reported a facile route to synthesize mono-substituted alkyl adamantanes via modified Grignard coupling (followed with one-step hydrodeoxygenation), including 1-ethyl-adamantane, 2-ethyl-adamantane, and 1- n -propyl-adamantane with high yields (> 75%). The process was modified via concentrating the Grignard reagents and altering the solvent, and one-step hydrodeoxygenation catalyzed by commercial Pd/C and zeolites was developed. Subsequently, comprehensive characteristics of alkyl diamondoid series, such as oxidation stability and combustion properties , were evaluated using pressure differential scanning calorimetry , rapid small-scale oxidation test, and hot-plate ignition test. Also, the specific impulse of alkyl diamondoids were revealed by theoretical calculation. The high-density alkyl diamondoids present adequate oxidation stability and possess better combustion characteristics over JP-10, thus can be considered as potential high-energy-density fuel for aerospace propulsion .
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JOURNAL OF FLUORESCENCE
·
2021
·Vol. 31
·期 4
·907-913
·
IF 2.217
Li Huiqian,Xue Weijian,Wang Jinping,Ma Jie,Zhao Bing,Guo Xiangfeng
A novel substituted imidazole derivative 1a with carboxyl and quinoline structure has been designed and synthesized. And our initial discovery is that this compound can effectively detect water in ethanol. And the metal in solution couldn’t affect the absorption and fluorescence Spectra of 1a. With the addition of water, the energy band appears a red-shift from 330nm to 355nm in the absorption spectra. And the emission spectrum undergoes an important change in its fluorescent effect in the presence of water. Furthermore, absorption peak of 1a displays a red-shift with increasing pH from 2.31 to 10.72. All available data (absorption and emission) strongly support the possible mechanism. Due to the pronounced fluorescence changing property, the substituted imidazole derivative 1a could be utilized as fluorescent probes for detecting water in ethanol. Graphical Abstract
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Bioactive Materials
·
2021
·
IF 14.593
Yuan Peng,Danfeng He,Xin Ge,Yifei Lu,Yuanhao Chai,Yixin Zhang,Zhengwei Mao,Gaoxing Luo,Jun Deng,Yan Zhang
Excessive production of inflammatory chemokines and reactive oxygen species (ROS) can cause a feedback cycle of inflammation response that has a negative effect on cutaneous wound healing. The use of wound-dressing materials that simultaneously absorb chemokines and scavenge ROS constitutes a novel ‘weeding and uprooting’ treatment strategy for inflammatory conditions. In the present study, a composite hydrogel comprising an amine-functionalized star-shaped polyethylene glycol (starPEG) and heparin for chemokine sequestration as well as Cu 5.4 O ultrasmall nanozymes for ROS scavenging (Cu 5.4 [email protected] ) was developed. The material effectively adsorbs the inflammatory chemokines monocyte chemoattractant protein-1 and interleukin-8, decreasing the migratory activity of macrophages and neutrophils. Furthermore, it scavenges the ROS in wound fluids to mitigate oxidative stress, and the sustained release of Cu 5.4 O promotes angiogenesis. In acute wounds and impaired-healing wounds (diabetic wounds), Cu 5.4 [email protected] hydrogels outperform the standard-of-care product Promogram® in terms of inflammation reduction, increased epidermis regeneration, vascularization, and wound closure.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 12
·5363-5370
·
IF 3.591
Yalin Huang,Wei Li,Yuwei Xu,Mu Ding,Jie Ding,Yun Zhang,Yuanhua Wang,Shanyong Chen,Yongdong Jin,Chuanqin Xia
The efficient capture of radioiodine from the waste of nuclear industries is a growing priority for the safe development of nuclear energy. However, because the iodine adsorption rate of previously reported adsorbents is very slow, they are inadequate for use in an actual emergency such as radioiodine leakage in a nuclear accident. Herein, a nitrogen-rich covalent triazine–piperazine-based porous polymer (n-CTP) was successfully synthesized via a mild one-step solvothermal route. The large pore size and abundant N-heterocyclic groups (with a nitrogen content as high as 39.69%) of n-CTP are beneficial for the diffusion and adsorption of I2, and they have the ability to decrease the adsorption time. The ability of n-CTP to adsorb iodine vapor was examined, and the results show that n-CTP possesses a faster adsorption rate (1.58 g g−1 h−1) than most iodine-capturing covalent organic polymers (COPs), excellent iodine uptake capacity (4.19 g g−1), satisfactory selectivity, and can be reused for at least three cycles without a significant loss of iodine uptake. FT-IR and Raman analyses revealed that the mechanism of iodine capture is attributed to the charge transfer interactions between n-CTP and the guest iodine. In addition, n-CTP also exhibits high iodine capture capacity (2.88 g g−1) and fast adsorption rate in iodine solutions. Thus, n-CTP has the potential to be applied to the rapid removal and enrichment of radioiodine in spent fuel reprocessing and has the ability to prevent environmental contamination in the case of nuclear accidents.
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Journal of Water Process Engineering
·
2021
·
IF 5.485
Longfeng Sun,Kai Xu,Xuefeng Gui,Lingli Liu,Qiong Lin,Xuan Song,Zhongxin Wang
Sulfur-containing polymers such as those with polysulfide linkages in their backbone have attracted strong interest due to the ease of modifying the structure and properties of these materials. Electrospun fiber membranes have large specific surface areas, adjustable microstructures and chemical properties, and recovery. Consequently, these materials are promising candidates for applications as sorbents for heavy metal enrichment and water remediation . Herein, polymeric sulfur–monoterpene (PST) was loaded into a polyvinylidene/poly(methyl methacrylate) (PVDF/PMMA) polymer matrix by electrospinning technology to obtain a uniform and continuous fiber-based membrane. It was found that treatment with a reducing agent increased the thiol group content in PST. Then, by using the coordination and binding effect between sulfhydryl groups and metal ions , it was found that the adsorption of Cd(II), Cr(III), Ni(II) and Hg(II) ions onto the membrane was enhanced under the stimulation of reduction. The results indicated that the reduction-responsive adsorption of Hg(II) and Cd(II) was the best, with maximum adsorption values of 58 and 34 mg g −1 for each of these respective ions. In addition, the presence of sodium ions did not interfere with the adsorption of Hg(II) or Cd(II) ions. The adsorption kinetics of Hg(II) and Cd(II) ions on the reduced membrane at different times were also studied. The results revealed that the adsorption of Hg(II) and Cd(II) ions onto the reduced membrane conforms to the pseudo-second-order kinetic model. These results indicated that PST can removal of heavy metal ions from wastewater via a convenient and reusable adsorption process .
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ACS Catalysis
·
2021
·
IF 13.084
Yu Gu,Shibin Wang,Huaijie Shi,Jun Yang,Suiqin Li,Haiyang Zheng,Wenbin Jiang,Jia Liu,Xing Zhong,Jianguo Wang
Environment-friendly electrochemical ozone production (EOP) is a promising route for in situ sterilization and discoloration applications. Herein, a Pt-SAs/BNC catalyst with Pt single atoms embedded into B/N codoped nanotubes is rationally designed and prepared. The process provides a local environment rich in oxygen intermediates and hence improves the EOP performance in neutral media by influencing the EOP thermodynamics and kinetics. The Pt-SAs/BNC catalyst exhibits excellent EOP performance with a Faraday efficiency of 21% at the current density of 50 mA cm–2, which is almost twice as much as that of commercial β-PbO2. Density functional theory calculations further reveal the synergistic effect between the B sites and the Pt single atom of the EOP mechanism. In addition, the Pt-SAs/BNC catalyst presented a significant performance in electrodegradation of various pesticides and antibiotics, indicating the potential environmental application capabilities of Pt-SAs/BNC.
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