Journal of Nano Research
·
2017
·
IF 0.511
Wan Xin Jia,Dong Tao Lu,Shao Min Shuang,Jun Yang,Chuan Dong
Magnetic chitosan nanoparticles (Fe3O4-CS MNPs) were synthesized by an improved one-pot hydrothermal method and applied for azo dye amido black 10B adsorption. The Fe3O4-CS MNPs were characterized by SEM, TEM, DLS, XRD, FTIR, TGA and VSM. The adsorptive behavior of amido black 10B on Fe3O4-CS MNPs was investigated using the UV-vis specteophotometric technique and the affecting parameters including solution pH, contact time, amido black 10B concentration and Fe3O4-CS MNPs amount were examined. The adsorption process followed the pseudo-second-order kinetic model. The adsorption equilibrium data fitted well with the Freundlich isotherm model with the saturated adsorption capacity of 124.8 mg/g at pH=2.0. The desorption experiment could be carried out using NaOH with the recovery of 91.78%. After five cycles, adsorption efficiency still reached 83.24%. The results showed that Fe3O4-CS MNPs possessed a simple synthesis route and excellent reusability, which have potential application in the adsorption of azo dye in environmental effluents.
研究领域:
材料科学
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环境科学
·
化学工程
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Jun Zheng,Linglin Wang,Lei Feng,Yuhan Gao,Feiyao Ren,Siyu Liu,Ting Zhou,Xiaochun Wu,Xin Lai,Daojiang Gao
Recently, Mn 4+ -activated fluoride red phosphors have received intensive attention due to their excellent luminescence properties. However, poor moisture resistance hinders their commercial application. Herein, (K 1- x Cs x ) 2 NbF 7 :Mn 4+ phosphors were designed and synthesized. All the obtained samples are rod-like microcrystals with monoclinic phase structure, Cs + -doping concentration has little influence on the microstructure while significantly impacts their luminescence properties. Specially, the composition optimized (K 1- x Cs x ) 2 NbF 7 :Mn 4+ ( x = 0.3) phosphor has the color purity of 94.20 %, the quantum yield of 53.90 % and the decay lifetime of 3.59 ms. More importantly, the optimized phosphor can maintain 83.20 % of the initial emission intensity after being immersed in distilled water for 1440 min, showing the excellent moisture resistance. A warm WLED with high CRI of 85 and low CCT of 4362 K is achieved by coating the obtained optimized red phosphor in chip. Our work demonstrates that the (K 1- x Cs x ) 2 NbF 7 :Mn 4+ red phosphors possess a great potential application in warm WLEDs.
研究领域:
材料科学
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光学工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiangxing Xu,Xianzhou Ning,Faqin Dong,Xiaoyong Yang,Wei Zhang,Bin Ye,Zhiguo Yang,Guoqiang Zhao,Chuan Zeng,Yushan Yang
In this paper, we present a productive low-temperature fabrication of Cs-hollandite ceramics by adding Bi 2 O 3 as a sintering aid to achieve high cesium retention. The effects of Bi 2 O 3 addition on the phase composition, crystal structure and aqueous stability of the stoichiometric Ba 0.9 Cs 0.3 Cr 2.1 Ti 5.9 O 16 ceramic waste form were investigated. It was found that adding Bi 2 O 3 can effectively reduce the sintering temperature and promote densification of Cs-containing hollandite products. The Cs-hollandite ceramic with 2 wt% Bi 2 O 3 sintered at 1000 °C showed a single phase with > 98 % cesium retention, which was ∼ 200 °C lower and ∼ 11 % retention rate higher than those of reported Cs-bearing hollandite. Moreover, the leached sample remained stable tetragonal structure, the LR Cs was in the order of 10 -3 g·m - 2 ·d -1 after 28 days and the leaching indexes > 8, exhibiting good aqueous stability. This route can be considered as a promising solution to prevent cesium loss for incorporating the cesium waste in ceramic hosts.
研究领域:
材料科学
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核废料管理
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 20
·12247-12254
·
IF 3.108
Xuan Zhou,Xinshuo Zhang,Jianjun Zhou,Lin Li
6-Deoxy-6-(2-aminoethyl) amino chitosan (CS-AEA) and aminoethyl modified CS-AEA (CS-AEA-AEM) were synthesized and characterized using FTIR, NMR and elemental analysis. The results showed that the expected CS derivatives were obtained, and the amine group content increased successively in CS, CS-AEA and CS-AEA-AEM. The red blood cell (RBC) agglutination behaviors in solutions of CS and its derivatives were studied using optical microscopy (OM) and ultraviolet-visible (UV-Vis) spectrophotometry. The results demonstrated that the agglutination of RBCs became more evident upon decreasing the pH value and increasing the concentration. Although CS-AEA-AEM had the highest content of amine groups, CS-AEA exhibited the best agglutination performance under the pH and concentration range studied. Potentiometric titration and ionization degree calculations showed that the agglutination behavior of RBCs was determined by the number of protonated amines in CS or its derivatives. Hemocompatibility tests showed that the hemolysis of CS derivatives increased after modification, and the CS derivatives could be classified as a slightly hemolytic material. We have sucessfully developed a CS derivative (CS-AEA) with very good RBC agglutination performance under neutral conditions.
研究领域:
生物材料学
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医学工程
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药物化学
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yaokun Fu,Yu Wang,Lu Zhang,Yuan Li,Shumin Han
MgH 2 is one of the ideal hydrogen storage materials because of its high hydrogen storage density, but the thermodynamic stability and slow kinetics of Mg/MgH 2 system hinder its practical application. Transition metal catalyst doping has become an important strategy to improve the hydrogen storage kinetics of MgH 2 . In this work, FeNi 3 @CS was prepared by solvothermal method with carbon spheres (CS) as the support, and introduced into Mg/MgH 2 system to prepare MgH 2 –FeNi 3 @CS composite. The initial dehydrogenation temperature of MgH 2 –FeNi 3 @CS composite is 565 K, which is 100 K lower than additive-free MgH 2 . At 423 K, MgH 2 –FeNi 3 @CS composite could absorb 4.5 wt% H 2 , while the hydrogen absorption capacity of MgH 2 without additives is only 2.0 wt%. After 10 cycles, the hydrogenation and dehydrogenation capacity could be maintained at 5.6 wt% and 4.5 wt%, respectively. In addition, the activation energy of MgH 2 –FeNi 3 @CS composite decreased by 52 kJ/mol compared with MgH 2 . FeNi 3 was in situ converted to Mg 2 NiH 4 and Fe after hydrogenation-ball milling, which were considered as the catalytic active substances in Mg/MgH 2 system. The synergistic catalysis of Mg 2 Ni/Mg 2 NiH 4 , Fe and carbon materials has a positive effect on improving the hydrogen storage performance of Mg/MgH 2 system.
研究领域:
材料科学
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能源存储
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高影响因子
JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Huidong Tang,Yanqiao Xu,Xiaobo Hu,Qing Hu,Ting Chen,Weihui Jiang,Lianjun Wang,Wan Jiang
Lead-free alloyed Cs 2 AgInCl 6 nanocrystals (NCs) are currently considered as a new class of lead halide perovskite alternative due to their less toxicity and excellent intrinsic stability. However, their solution preparation process with oleylamine as ligands are easy to the formation of metallic Ag due to the reduction of Ag + , resulting in poor photoluminescence (PL) performance of NCs. Herein, a facile one-pot solution synthesis strategy was proposed to prepare stable Bi 3+ doped Cs 2 AgInCl 6 NCs via tri-n-octylphosphine (TOP) as co-ligands, and the emission mechanism was further investigated. The prepared Bi 3+ doped Cs 2 AgInCl 6 NCs show broad dual emission bands at around 410 nm and 565 nm, in which the violet emission band is ascribed to the surface defect states, while the yellow emission band of as-synthesized NCs is attributed to the 3 P 1 → 1 S 0 self-trapped excitons recombination of Bi 3+ ions. Due to the introduction of BiCl 6 states after doping with Bi 3+ and well elimination of surface metallic silver by strongly coordinating of TOP, the PL quantum yield of as-synthesized NCs is obviously elevated from 1.25% to 5.10%. The prepared Bi 3+ doped Cs 2 AgInCl 6 NCs exhibit excellent storage stability and light stability, making it a promising single emitter fluorescence material for white light-emitting diode devices.
研究领域:
材料科学
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光学
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高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
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IF 0.847
Qing Yao,Kaiyu Wang,Jie Zhang,Changqian Li,Chenyu Shang,Feitong Chen,Qi Huang,Qiqi Zhao,Weiwei Zhang,Xiaoyuan Zhan,Jianxu Ding
ABSTRACT Introducing inorganic cation into hybrid organic-inorganic perovskites (HOIPs) has attracted great attention because of the enhancement stabilities without sacrificing their excellent optoelectronic properties. Here, we introduce Cs and Rb into MAPbI 1.8 Br 1.2 single crystals (SCs) to dig out the mixed cation effect on optoelectronic performances and phase stabilities. Both Rb and Cs can increase the lattice capacity, which is sufficient to relieve the lattice stress caused by photon energy, thus achieving the purpose of stabilizing the lattice structure and inhibiting migration of halide ions, compared with MAPbI 1.8 Br 1.2 SC. On the other hand, the smaller polarity of Rb and Cs reduces the electron-phonon coupling, thus significantly inhibiting the migration of halide ions. Meanwhile, through planar photo-detectors, MA 0.9 Cs 0.1 PbI 1.8 Br 1.2 -based device behaves much excellent optoelectronic performance (R = 0.170 A/W, EQE = 51.39 %, D* = 4.42 × 10 12 Jones, on/off ratio: ~522).
研究领域:
材料科学
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光学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Wan Peng,Yefeng Jiang,Yang Zhang,Youjin Lai,Yiming Zhu,Huixia Wang,Zilin Kan,Pingsheng Liu
Bleeding control by traditional hemostatic materials poses a risk of continuing oozing bleeding, while existing self-gelling hemostatic powders still face challenges in simultaneously achieving robust wound sealing and effectively accelerating blood coagulation. Herein, we reported acrylic acid/methacrylic acid/2-aminoethyl methacrylate copolymer (PAMA) and chitosan (CS) as a new type of self-gelling composite powder (PAMA-CS) for acute bleeding wound sealing with reduced blood leakage. Upon rapid blood absorption, PAMA-CS powders could quickly form an adhesive hydrogel that strongly binds to bleeding tissues, exhibiting high burst pressure tolerance (up to 452.6 mmHg) for wound sealing to prevent bleeding. The incorporation of chitosan endowed significantly enhanced liquid uptake ability and accelerated blood coagulation (clot index of 77.92 % within 30 s) to the PAMA-CS powder. Based on the synergistic effect of tight adhesive sealing and accelerating intrinsic blood coagulation, PAMA-CS powders could achieve effective hemostasis within 20 s for acute bleeding liver and stomach on rats, outperforming commercial hemostatic chitosan powders. Combined with rapid hemostasis, tight & stable wound sealing, and favorable biodegradation, PAMA-CS powders may serve as a promising hemostatic candidate for emergency bleeding control and wound closure.
研究领域:
生物材料学
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医学工程
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创伤修复
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Chun Sun,Yelin Ding,Yiwei Zhao,Zhihui Deng,Kai Lian,Zhengtong Wang,Jiazhi Cui,Ruifeng Wang,Jiabao Bai
BiOBr has garnered significant attention for photocatalysis owing to its distinctive layered structure. Nevertheless, it is full of challenges to synthesize high-quality BiOBr nanosheets by a simple room-temperature strategy due to the rapid chemical reaction between (Bi 2 O 2 ) 2+ cations and Br - anions. Herein, a Cs 3 Bi 2 Br 9 conversion strategy is proposed to fabricate BiOBr nanosheets with highly exposed (001) facets. BiOBr nanoclusters can grow on the surface of Cs 3 Bi 2 Br 9 during the hydrolysis process, which can prevent further corrosion of Cs 3 Bi 2 Br 9 , resulting in a sluggish BiOBr formation rate. During the conversion process, atom rearrangement occurs, leading to the creation of abundant oxygen vacancies. Furthermore, through precise adjustment of the amount of Cs, we can finely modulate the width and thickness of BiOBr nanosheets. As a result, the optimal sample achieves complete photodegradation of rhodamine B under 12.5 min of light irradiation. Utilizing this facile and convenient preparation method, an ohmic heterojunction comprising MXene and BiOBr has been synthesized, effectively promoting the separation of photogenerated carriers. Excitingly, the fabricated BiOBr/MXene exhibits higher photocatalytic efficiency than the single BiOBr, which can degrade rhodamine B within 7.5 min.
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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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70332
·
IF 3.8
Jiaqi Zhao,Xiaoyan Shu,Wenhong Han,Lijing Huang,Xi Peng,Jinchun Wei,Mingfen Wen,Xirui Lu
High-level radioactive waste (HLW) Cs is characterized by high fission yield, strong beta and gamma radioactivity, and strong migration activity, which needs to be properly immobilized. Given the thermal influence on volatile Cs, we tentatively prepared natural biotite hornblende monzonite glass to immobilize the simulated nuclear waste CsNO 3 under lowered temperatures. A suite of characterization techniques was employed to analyze the thermal effect, phase evolution, microstructure, micromorphology, and elemental distribution of the prepared waste forms. Moreover, the service performance of the waste forms, including density, hardness, and chemical durability were evaluated. The results indicate that the biotite hornblende monzonite glass powder can incorporate up to 50 wt.% of CsNO 3 , with Cs being immobilized both in the aluminosilicate glass network and the CsAlSi 2 O 6 crystalline lattice. The glass-ceramic composite enhances the Cs retention rate (98.32%) and reduces its leaching rate (∼10 −4 g m −2 day −1 ). This method addresses key challenges in HLW management, especially in dealing with high-yield fission products of low melting and high mobility.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
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2025
·
IF 2.9
Ji Xinyuan,Han Yuliang,Fang Jiahui,Tian Dating,Hu Sheng
In this study, a novel ion-imprinted polymer (IIP) was synthesized using attapulgite (ATP) and chitosan (CS) as the substrates and methyl methacrylate (MMA) as the monomer. The IIP (MMA) was characterized by FTIR, XRD, SEM, TEM, BET, and XPS. Orthogonal experiments were analyzed to show that when initial concentration of Cd 2+ was 100 mg/L, and the adsorption time was 20 min, under the condition of IIP (MMA) and NIP (MMA) on Cd adsorption capacity, were 57.56 mg/g and 52.03 mg/g, at the same time, the adsorption capacity of Se were 17.14 mg/g and 15.86 mg/g, far below the Cd adsorption capacity. The results showed that IIP(MMA) synthesized with ATP and CS as substrates and MMA as functional monomer has been successfully synthesized and can be used for selective adsorption of Cd 2+ in water. Graphical abstract
Illustration of the imprint polymerization process
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 12
·1-15
·
IF 3.097
Ma Guihua,Zheng Youxiong,Zhou Yuting,Gao Li,Liu Bingxin,Yu Xingchang,Zhang Lei
The ammonium molybdophosphate (AMP) with excellent ability of separation and extraction for radioisotope 137 Cs and Cs + in saline has a high solubility in water, which avoids its adsorbent role to extract Cs + from enhydrous solutions directly. In our paper, the copolymers as the carrier of AMP are prepared via RAFT (reversible addition-fragmentation chain transfer) polymerization, and the AMP is covalently located in shell or core of self-assembled copolymer micelles for efficient Cs + adsorption. The influence of the initial concentration of Cs + , the pH value and the dosage of adsorbents, and the adsorption performance of Cs + is evaluated. The initial concentration of Cs + has little effect on the adsorption effect, and the optimal pH of the solution is 7.0. The adsorption–desorption cycles indicate that the micelles have excellent stability and capability for regeneration. The adsorption process of Cs + follows the quasi-second-order kinetic model, and the adsorption equilibrium is reached within 3 h. And the equilibrium adsorption capacities are 8.49 mg/g (AMP in shell of micelle) and 9.34 mg/g (AMP in core of micelle), respectively. According to the Langmuir adsorption model, the maximum adsorption capacity of Cs + on micelles is 71.79 mg/g and 164.20 mg/g, respectively, and the adsorption process is single-layer adsorption. The principle of Cs + selective adsorption is the Cs + and NH 4 + exchange reaction in the gaps of the AMP. The results show that micelle with AMP loaded in shell is considered to be the more suitable adsorbent for separating and extracting Cs + .
研究领域:
材料科学
·
环境科学
·
放射化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）