MATERIALS TECHNOLOGY
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2021
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IF 3.846
Ling Chen,Yang Qin,Xinfu Cao,Jianbing Gao,Shishuo Liu,Yang Zhang,Jing Tu,Yingbo Wang,Jie Liu,Weidong He
In this study, a novel nitrated bacterial cellulose/2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/ammonium perchlorate nanoenergetic composite was successfully prepared by the sol–gel method and the freeze-drying technology. The structure and composition were characterised by means of scanning electron microscope, X-ray diffractometer and Fourier-transform infrared. The results demonstrated that the structure of the gel nanoparticles was granted with unique network cross-linked porous, wherein the hexaazaisowurtzitane and ammonium perchlorate nanoparticles were embedded and dispersed uniformly in the gel matrix. The thermal decomposition properties of composites were analysed by differential scanning calorimeter-thermogravimetric analysis, and the results revealed that the composites exhibited only two exothermal peaks which correspond to the nitrated bacterial cellulose/hexaazaisowurtzitane and ammonium perchlorate. In addition, the impact and friction sensitivities of composites were also performed and showed outstanding safety performance. Hence, this preparation strategy of nitrated bacterial cellulose-based nanocomposite energetic materials may provide promising application in high-performance and low-sensitivity propellants.
研究领域:
材料科学
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能源与推进剂
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 6
·1-11
·
IF 2.132
Zhao Yubin,Xie Cong,Song Yuxiang,Yang Ping
The photoluminescence (PL) of doped ions is depended strongly on the position of the ion in the substrate. Ion doping endows semiconductor nanocrystals with novel properties. In this paper, Mn:CsPb(Cl/Br) 3 nanocrystals (NCs) with different halogen ratios were obtained by one-pot hot injection synthesis and halogen ion exchange. The emission of Mn 2+ from 4 T 1g - 6 A 1g d-d transition was observed in the case of changing the molar ratio of Cl/Br for Mn:CsPb(Cl/Br) 3 NCs. In the case of a Cl/Br ratio of 4/1, the PL peak of perovskite became weak and Mn 2+ emission was enhanced. After I − ion exchange, the emission of Mn 2+ was observed in Mn:CsPb(Cl/Br) 3 with Cl/Br ratio of 1/4, in which the PL efficiency of the nanocrystals reached 55.74%. Thus, Cl − ions increase the band gap and effectively promote the emission of Mn 2+ . At the same time, the morphology of the samples after ion exchange always remains cube. The lifetimes of the nanocrystals were short aged with increasing Cl − ions and prolonged with increasing I − ions. Because these Mn:CsPbX 3 (x = Cl, Br, I) NCs with different halogen ratios revealed highly stabile blue to red emission, the nanocrystals would be utilizable for further applications.
Graphical abstract
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Tao He,Zhaochu Hu,Wen Zhang,Haihong Chen,Yongsheng Liu,Zaicong Wang,Shenghong Hu
In this study, a simple and effective method for the simultaneous analysis of Cl, Br, and I in geological materials based on NH4HF2 digestion in open vessels (Savillex Teflon vials) is proposed. It is very interesting to note that Cl, Br, and I are not lost during NH4HF2 digestion at temperatures of 200–240 °C for 0.5–12 h in open vessels. This should be related to the alkaline atmosphere environment caused by the NH3 produced during NH4HF2 digestion, which suppresses the volatilization loss of Cl, Br, and I. A 100 mg sample of geological materials can be completely digested by using 400 mg of NH4HF2 at 220 °C for 2 h in Savillex Teflon vials. The use of new Savillex Teflon vials significantly reduced the procedural blanks of halogens compared with the old Savillex Teflon vials. The developed method was successfully applied to the simultaneous determination of Cl, Br, and I in a series of international geological reference materials. Most of the results were found to be in reasonable agreement with values reported in the literature. This simple, rapid, effective, and economical analytical method will significantly promote the development of halogen geochemistry.
研究领域:
地球化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yunfeng Tan,Shengqiang Ma,Nengsheng Liu,Xintao Wang,Chenxi Li,Jinmao Ma,Kun Wu,Mohe Zhang,Jinxin Liu,Jianwei Song,Jiangzhou Qin,Quanlin Zhao,Zhengfang Ye
Industrial wastewater pollution has emerged as a significant global environmental challenge, particularly regarding the urgent need to address highly acidic industrial effluents containing organic pollutants. As a novel high-energy explosive, hexanitrohexaazaisowurtzitane (CL-20) inevitably generates strongly acidic wastewater during its production and application processes, posing severe threats to ecological systems and human health. This study systematically investigates the adsorption performance of two silicon-based materials, sodium silicate (Na 2 SiO 3 ) and silicic acid (H 2 SiO 3 ), for the removal of CL-20 from wastewater. Experimental results demonstrate that the Langmuir isotherm model reveals maximum adsorption capacities of 87.21 and 69.97 mg/g for H 2 SiO 3 and Na 2 SiO 3 , respectively. Kinetic studies indicate that the adsorption processes of both materials conform to the pseudo-second-order kinetic model (R 2 > 0.98). Thermodynamic parameter analysis demonstrates reduced spontaneity of the adsorption process with increasing temperature, accompanied by exothermic characteristics and entropy reduction. Through density functional theory (DFT) calculations, the mechanisms underlying electrostatic adsorption and chemical bonding interactions between CL-20 molecules and silicon-based materials are elucidated. This research establishes a novel technical approach for efficient CL-20 wastewater treatment while providing theoretical foundations for developing and optimizing related adsorption materials.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
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2021
·Vol. 11
·期 6
·661
·
IF 4.146
Xi Lin,Yanxia Li
In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+and IL addition exchange the band gap of TiO2and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.Keywords:TiO2/Ag[BMIM]Cl composites;rhodamine B;visible photocatalytic degradation
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 8
·1216-1226
·
IF 1.887
Shuang Xu,Ai-Min Pang,Zhuo Wu,Hai-Tao Li,Wei Li,Jie Kong
Two types of bonding agents were synthesized based on polyetheramines (PEAs), which aim to increase the strain of AP/CL-20/GAP formulation. The PEAs, terminated with cyano (CTPEA) and Schiff base (SBPEA) groups, were applied in the AP/CL-20/GAP formulation, respectively. The results showed that the bonding agents TCN-403 (CTPEA) and TBA-403 (SBPEA), which were prepared from trifunctional PEA named as T-403, could significantly increase the maximum elongation ratio of the formulation. The differences between the TCN-403 and TBA-403 were analyzed by DMA of the formulations, SEM of the coated fillers, and in-situ tensile test, indicating that the Schiff base bonding agents can effectively inhibit the dewetting of the binder from the solid particles in the formulations.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2022
·
IF 5.6
Yi Wang,Shaoqi Zhang,Yuxiang Yan,Hengdong Ren,Jian Chen,Lizhe Liu,Xinglong Wu
A series of flower-like BiOCl x Br 1-x (x = 0∼1) with different Cl − doping contents were prepared via a simple co-precipitation method. Experimental results show that BiOCl 0.2 Br 0.8 (20 mg) can decompose tetracycline hydrochloride (20 mg/L) of ∼100% within 30 min, which is far higher than those of the previously reported BiOCl and BiOBr. Microstructural and spectroscopic characterization demonstrates that Cl − doping can effectively change the growth orientation of the layered BiOCl x Br 1-x nanosheets to expose more (102) active surfaces. Density of states calculations and radical trapping experiments reveal that strong coupling between the electronic states of multi-anions adjusts the band structure, which improves light absorption and generation of main active species ⋅O 2 − . Meanwhile, strong polarization caused by anionic doping also promotes separation and migration of the photogenerated carriers to different positions of the active surface. As a result, the photocatalytic activities are improved largely and optimal in BiOCl 0.2 Br 0.8 .
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Ling Chen,Weidong He,Jie Liu
Benefiting from the sol–gel technology and vacuum freeze-drying technology, a novel nanoenergetic composite material nitrated bacterial cellulose (NBC)/CL-20 (hexanitrohexaazaisowurtzitane) has been fabricated. The thermal decomposition kinetic and mechanism have been studied by thermogravimetric analysis–differential scanning calorimetry (TG–DSC) under nonisothermal conditions in a nitrogen atmosphere at multiple heating rates; the process and mechanism of thermal decomposition of NBC/CL-201:1 have also been probed by TG–DSC–IR. The kinetic and thermodynamic parameters, such as activation energy (Ea), per-exponent factor (ln AK), rate constant (k), activation heat (ΔH⧧), activation free energy (ΔG⧧), and activation entropy (ΔS⧧) are calculated. The results indicate that NBC/CL-20 presents much lower activation energy than both of raw NBC and raw NC, and NBC/CL-201:1 exhibits superior thermal performance of heat release and Ea. Moreover, there the existence mechanism has also been probed between NBC and CL-20 during the process of thermal decomposition. The structure and composition have been characterized by a series of characterization methods and indicate that CL-20 has been embedded homogenously in the NBC gel matrix with a prominent porous cross-linked network structure. The impact and friction sensitivities have also been decreased. The whole process effectively avoids high temperatures, and thus ensures operational safety.
研究领域:
材料科学
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热力学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 30
·4345-4354
·
IF 3.474
Meng Liu,Chuming Yin,Peng Chen,Mingtao Zhang,Sean Parkin,Panpan Zhou,Tonglei Li,Faquan Yu,Sihui Long
Chlorine can participate in numerous interactions such as halogen bonding, hydrogen bonding, and London dispersion in the solid state. In this work, we report the influence of a chlorine substituent on the polymorphism of a potential anticancer drug, 4-chloro-phenylanthranilic acid (CPAA). Three polymorphs have been discovered for this compound, and the three forms were characterized by single-crystal X-ray diffraction, power X-ray diffraction (PXRD), FT-IR, and Raman spectroscopy. Both conformational flexibility of the molecule and the sp2CH⋯Cl hydrogen bond seem to lead to the polymorphism of the system. The phase behavior was investigated by differential scanning calorimetry (DSC), with the conclusion that form II converts to III upon heating. A conformational scan shows the conformational minima corresponds to the conformers existing in the polymorphs. Lattice energy calculations show energies of −106.70, −104.72, and −194.42 kJ mol−1 for forms I to III, providing information on relative stability for each form. Hirshfeld analysis revealed that intermolecular interactions such as H⋯H, C⋯H, H⋯Cl, and H⋯O contribute to the stability of the crystal forms.
研究领域:
药物化学
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晶体学
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物理化学
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产品关联
DOI
高影响因子
Journal of Applied Spectroscopy
·
2025
·
IF 1
Han Dan,Niu Xiaoxue,Wang Jing,Yan Zihong
Zr and Cl double-doped carbon dots (Zr/Cl-CDs) were prepared by a one-step hydrothermal method using citric acid, urea, and ZrCl 4 as precursors. Zr/Cl-CDs were characterized by ultra-violet-visible spectroscopy (UV-Vis), transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). Experimental analysis revealed that the average size of Zr/Cl-CDs was 2–3 nm, while XPS analysis revealed the presence of C–Cl and Zr–O bonds. The fluorescence quantum yield of the final CDs was 17.5% at the excitation of 360 nm. In addition, Zr/Cl-CDs exhibited excellent performance in the detection of rutin with a concentration of 30–110 and 100–160 μmol/L, respectively. Linear correlation coefficients (R 2 ) were 0.9931 and 0.9962. The underlying mechanism was that rutin had an excellent quenching effect on the emission of the Zr/Cl-CDs as the fluorescence intensity exhibited a good linear relationship between rutin concentration and fluorescence intensity. These findings provide a new strategy for synthesizing double-doped CDs for rutin detection.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ping Ye,Heng Ding,Bo Yang,Weimiao Wang,Xiaodong Li,Zhiqiang Qiao,Rui Li,Guangcheng Yang,Guoqing Lv
The ignition strategy of energetic materials using low-energy near-infrared (NIR) laser has garnered significant attention due to its enhanced safety and reliability. This study explores the use of a relatively photosensitive but mechanical insensitive energetic material, DATNBI, to facilitate the self-assembly of nano-CL-20 crystals into polycrystalline particles though solvothermal induction, yielding a rough structure conducive to NIR laser ignition. The findings demonstrate that by adjusting the content of DATNBI, it is possible to achieve micro-nano controllable spherical CL-20/DATNBI (C/D) particles, with CL-20 as the primary component and DATNBI as the auxiliary component. The incorporation of DATNBI and the rough surface structure enhance the light absorption of C/D particles in the NIR band. Additionally, the unique synergistic effect between CL-20 and DATNBI during thermal decomposition further promotes NIR laser ignition. As expected, the C/D particles achieved self-sustained combustion and exhibited excellent combustion performance under a 1064 nm laser, which is challenging to be achieved with raw CL-20 or raw DATNBI. Furthermore, the relatively insensitive DATNBI and spherical structure reduced the impact sensitivity of the C/D particles. This multifunctional material strategy, integrating energy, safety, environment-friendliness, and laser ignition performance, offers a novel approach for laser ignition of energetic materials.
研究领域:
化学
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材料科学
·
能源与燃料
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 12
·2026
·
IF 5.719
Weizhuo Zhang,Xin Li,Chencheng Peng,Fei Yang,Linyuan Lian,Runda Guo,Jianbing Zhang,Lei Wang
Colloidal cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite nanocrystals (NCs) demonstrate supreme optical properties in the spectra region of infrared, red, and green. High-performance blue-emitting counterparts are still eagerly required for next-generation full-color displays. However, it is challenging to obtain efficient blue perovskite NCs, especially in a deep blue region with an emission wavelength of around 460 nm or shorter. Herein, calcium halide and ammonium ions are applied simultaneously to modify the CsPb(Br/Cl)3NCs in situ to reduce surface defects, finally remarkably enhancing the photoluminescence quantum yield (PLQY) from 13% to 93% with an emission peak at 455 nm and the Commission Internationale de l’Eclairage (CIE) coordinates at (0.147, 0.030), which is close to the requirement of the Rec.2020 standard and also meets the requirement of blue emission in DCI-P3. Bright white emission and a wide color gamut are also achieved by combining the commercial red-emitting and green-emitting phosphors. The combination of time-resolved PL spectra and femtosecond transient absorption results discloses the reason for PLQY improvement as suppressing the nonradiative recombination.Keywords:CsPb(Br/Cl)3nanocrystals;surface passivation;blue emission;ammonium ion;calcium
研究领域:
材料科学
·
光电技术
·
纳米技术
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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）