Molecular Catalysis
·
2020
·
IF 3.687
Yiqing Zeng,Zihua Wu,Lina Guo,Yanan Wang,Shule Zhang,Qin Zhong
The problems of easily inactivated by SO 2 poisoning and high N 2 O formation for MnO x based catalysts hinder its application in selective catalytic reduction (SCR) of NO x with NH 3 . The SO 2 poisoning mechanism has been well demonstrated, but the N 2 O formation mechanism was still controversial due to previous limited study. Herein, MnO 2 supported on MO x (Mn/M, M = Al, Si and Ti) were prepared by wet impregnation method to investigate the carrier effect on the formation of N 2 O. Although all of selected supports had a large amount of surface acid sites, only forming strong active-support interaction can separate the activation sites of NH 3 and NO + O 2 . Accordingly, the activation of NH 3 and NO + O 2 on MnTi was respectively occurred on TiO 2 and MnO 2 , but both NH 3 and NO + O 2 was activated on MnO 2 over MnAl and MnSi samples. The over-activation (NH 2 dissociated into NH) of NH 3 would be effectively inhibited when NH 3 activation was occurred on TiO 2 , thus it can significantly suppress the formation of N 2 O. In contrast, the NH 3 species would sharply decompose into NH on MnO 2 and then lead to the high amount of N 2 O. Finally, we proposed some methods that might effectively improve the selectivity of MnO x- based catalysts.
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高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 8
·期 5
·919-927
·
IF 5.047
Minghui Zan,Cong Li,Daoming Zhu,Lang Rao,Qian-Fang Meng,Bei Chen,Wei Xie,Xingwang Qie,Li Li,Xiaojiao Zeng,Yirong Li,Wen-fei Dong,Wei Liu
Copper ions (Cu2+) and L-cysteine (L-Cys) in the human body always play critical roles in various physiological processes, while abnormal Cu2+ and L-Cys concentrations in the biological system lead to many diseases. In this manuscript, Si-doped carbon dots (Si-CDs) with near-infrared fluorescence were designed for the detection of Cu2+ and L-Cys through the fluorescence “on–off–on” mode. The carbon dots exhibited not only excellent optical merits including good stability against photobleaching and high chemical stability, but also superior biological compatibility. Interestingly, due to the abundant amino groups distributed on the surface of Si-CDs, they could bind to copper ions to form cupric amine complexes and then quench the fluorescence of Si-CDs due to an electron transfer process. In addition, upon the addition of L-Cys, the FL intensity of Si-CDs could be effectively recovered accompanied with complexation between Cu2+ and the functional groups in L-Cys, due to which Cu2+ was removed from the surface of Si-CDs. Notably, as far as we know, these are the first red-emitting carbon dots for copper ion and L-Cys assays in water samples and human plasma samples. Furthermore, this strategy was successfully applied to the determination of Cu2+ and L-Cys in living systems, demonstrating great practicability in biomedical applications.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·Vol. 142
·期 43
·e57676
·
IF 2.8
Li Dang,Jia Liu,Xinyi Bao,Yongkui Zheng,Zhihui Lv
To enhance the interfacial compatibility and fire safety of polyvinyl chloride (PVC)/molybdenum trioxide-doped magnesium hydroxide (MO@MH) composites, three chain-length-varied silicon-phosphorus polyether modifiers (ABP 200 , ABP 1000 , and ABP 2000 ) were synthesized and characterized. Magnesium-molybdenum-silicon-phosphorus multicomponent flame retardants (MO@MHABP) were subsequently prepared via wet modification. The chain-length-dependent mechanical behavior of PVC composites was systematically evaluated through combined experimental characterization and molecular dynamics (MD) simulations. Static mechanical tests revealed that yield strength, tensile strength, and impact strength of PVC/MO@MH composite were all improved by inducing ABP modifiers, with the shortest-chain ABP 200 showing optimal enhancement. Dynamic mechanical analysis revealed increased storage/loss modulus and glass transition temperatures for PVC/MO@MHABP, indicating restricted chain mobility. Interface interaction models (Turcsányi equation and Kubát model) combined with MD simulations demonstrated that the shortest-chain modifier (ABP 200 ) enhanced interfacial adhesion through the strongest Cl–NH interactions (supported by the most negative Δ E values). Cone calorimetry tests indicated that ABP modification decreased the heat release rate and total heat release of PVC/MO@MH composites but did not significantly improve smoke suppression. This study provides valuable insights into interfacial regulation and performance optimization in PVC composites.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Xiaoyu Zhao,Wenhao Chen,Juan Liu,Fei Zhou,Jian Liu,Xiaocheng Li,Fangfang Wang,Jingwei Hu,Yongzhi Wang,Shulai Lei
The practical applications of silicon (Si) anode is limited by its severe volume expansion, sluggish Li + transport, interfacial side reactions, and low initial Coulombic efficiency (ICE). Beyond the known capacity loss from SEI formation and “dead” Li x Si domains insulated by solid electrolyte interphase (SEI) layer, the kinetically trapped electro-active lithium in Li x Si—a frequently overlooked factor—also critically limits ICE and Li + transport. Herein, we construct a mechanically robust and Li + -conductive artificial LiAlO 2 interphase on Si surface via an evaporation-controlled hydrolysis, followed by an in situ chemical prelithiation, and a thermal annealing process. Calculations show that the LiAlO 2 /Si interface facilitates the interfacial Li + diffusion by lowering the Li + migration barrier from 0.90 to 0.31 eV. Benefiting from the improved interfacial stability and enhanced Li + transport kinetics, the Si@LiAlO 2 anode reduces the capacity loss from trapped active Li, trapped inactive Li, and SEI Li consumption to 2.3%, 0.3%, and 10.4%, respectively (vs 10.8%, 1.5%, and 16.8% for pristine Si). Consequently, Si@LiAlO 2 delivers a high capacity of 3020.2 mAh g −1 with a high ICE of 87.1% at 0.2 A g −1 , far exceeding 70.9% of Si anode. The Si@LiAlO 2 anode also exhibits excellent rate capability (809.1 mAh g −1 at 8 A g −1 ), and remarkable cycling durability (980 mAh g −1 after 1000 cycles at 4 A g −1 , 80.1% capacity retention). Furthermore, incorporating 10 wt% Si@LiAlO 2 can enhance the energy density of the LiFePO 4 ||graphite full cell by 25%, underscoring its promising potential for practical high-energy-density LIBs.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xuan Liu,Dian Zhang,Rongrong Ma,Yu Wang,Xiaofeng Yang,Yijun Liu
With the rapid development of hypersonic vehicles and broadband wave-transparent radome, Si 3 N 4 porous ceramics (Si 3 N 4 -PC) have attracted attention due to their excellent intrinsic properties of Si 3 N 4 and high porosity. However, its high porosity results in low strength and toughness, which are fundamental properties for radome. Reaction bonded (RB) Si 3 N 4 -PC has advantages of dielectric properties and cost over general phase transformation sintering (PTS) and sintered reaction bonded (SRB) Si 3 N 4 -PC while it has been neglected in recent years. In this study, RB and SRB Si 3 N 4 -PC prepared by non-aqueous gelcasting and the influence of Si powders ingredient on their properties are discussed in order to illuminate the potential of RB Si 3 N 4 -PC in wave-transparent materials. The results show that RB Si 3 N 4 -PC with dual-granularity ingredients of 5 μm & 45 μm produces a two-tier tissue of framework of coarse whiskers enhanced by a network of tiny whiskers. SRB Si 3 N 4 -PC evolves into a two-tier tissue of framework of columnar and rod-like grains joining together to brace each other. The two-tier microscopic tissue strongly reinforces and toughens the structure and results in higher σ F and γ wof . As a result, the RB and SRB Si 3 N 4 -PC of dual-granularity of 5 μm & 45 μm obtain the maximum σ F of 109.94 MPa and 119.56 MPa as well as maximum γ wof of 990.74 J m -2 and 1167.88 J m -2 , respectively. Furthermore, the ε′ and tanδ of RB and SRB Si 3 N 4 -PC of dual-granularity of 5 μm & 45 μm are about 4.20 and 4.52 as well as 7.01 × 10 -3 and 22.90 × 10 -3 , respectively. It is concluded that RB Si 3 N 4 -PC of dual-granularity has good mechanical and dielectric properties, which are favorable for radome.
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高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 9
·2200-2211
·
IF 5.344
Qing Sun,Mengting Duan,Wei Fan,Bing Fan
Enterococcus faecalis is the main cause of refractory root canal infections in human teeth. The control of root canal infection is one of the conditions necessary for the successful treatment of refractory root canal infections. In the present study, nano-scale silver–zinc–calcium–silica particles loaded with different ratios of silver–zinc were successfully prepared (Ag0.5Zn3-MCSNs and Ag0.5Zn10-MCSNs). The release profiles, antibacterial activity against E. faecalis, infiltration depth into dentinal tubules, biocompatibility and effects on dentin microhardness in vitro were investigated. In addition, the antimicrobial effects of the particles against Enterococcus faecalis reinfection were evaluated in vivo in the teeth of beagle dogs. Ag, Zn, Ca and Si were released from Ag–Zn-MCSNs, and the atomic ratio of silver and zinc released can reach the optimal value of 1 : 12 (Ag0.5Zn10-MCSNs). The particles also showed good biocompatibility and antibacterial activity against Enterococcus faecalis and did not reduce the hardness of dentin. The nanoparticles could be driven into the dentinal tubules of dentin slices by ultrasonic activation. In the root canals of beagle dogs, both Ag0.5Zn3-MCSNs and Ag0.5Zn10-MCSNs demonstrated strong preventive effects against E. faecalis infection. The Ag–Zn–Ca–Si mesoporous nanoparticles may develop into a new effective root canal disinfectant or root canal sealer.
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PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaohong Yao,Jian Zhang,Chao Long
This study explored how the Si/Al ratio in Nb-Mn/MCM-41 catalysts affect toluene degradation via plasma catalysis. Adjusting the Si/Al ratio altered catalyst acidity and redox properties, decreasing the Si/Al ratio led to increased acidity, higher Mn 3+ /Mn 4+ ratio and greater O ads /O lat ratio as indicated by NH 3 -TPD, XPS, and O 2 -TPD analysis. Lower Si/Al (Nb-Mn/M(25)) boosted toluene removal efficiency to 98.2% under dry conditions due to increased oxygen vacancies and acidity. Moderate humidity enhanced conversion, but higher humidity levels proved detrimental, especially for low Si/Al catalysts. At a humidity level of 3.11 vol%, the toluene removal efficiency of Nb-Mn/M(25) exhibited a reduction of 15.3%, while Nb-Mn/M(200) with higher Si/Al ratio decreased only by 3%. Hydrophobic, higher Si/Al catalysts showed better resistance to humidity's negative impact. These findings offered insights into designing efficient catalysts for VOC removal by optimized Si/Al ratio and managing humidity.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 7
·e70253
·
IF 0
Chiyuan Wang,Xin Long,Changwei Shao,Jiawei Huang,Jiaqi Ren
Preparing polysilazoxanes with a controlled molecular structure is the ideal route for fabricating Si O C N ceramics with adjustable composition and properties. In this paper, liquid polysilazoxanes were synthesized via a controlled substitution reaction between trichlorosilane and alcohols (R OH), followed by the condensation with ammonia. By adjusting the alkyl groups (R tert -butyl, dioxane and triazolylmethyl) of alcohols, three kinds of polysilazoxanes with Si N Si backbones, but different side chains were synthesized. During high-temperature pyrolysis, tert -butoxy groups in polysilazoxanes are easily removed, producing low-carbon (< 4 wt%) ceramics, while dioxane and triazolylmethyl groups decompose to form oxygen-rich and nitrogen-rich ceramics, respectively. Due to the composition distinction, the resulting Si O C N ceramics showed quite different high-temperature behavior. This report provides a direct and effective method for obtaining polysilazoxanes with a controlled molecular structure, which is useful for fabricating Si O C N ceramics with improved high-temperature performance.
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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Dandan Li,Xiaoxiao Ji,Xianjing Gong,Fangchang Tsai,Qunchao Zhang,Li Yao,Tao Jiang,Robert K.Y. Li,Hengchong Shi,Shifang Luan,Dean Shi
Si doped-poly(ethylene glycol) ( Si-PEG) hybrid polymer electrolyte with Si O C bonds in the main chain obtains high ionic conductivity even at room temperature because of the more flexible molecule chains. In this work, poly(ethylene glycol)-borate ester (B-PEG) is further covalent bonded into the crosslinked Si-PEG network to form the hybrid solid polymer electrolyte (HSPE). Comparing to previous works in which B-PEG is just added as a plasticizer , the Lewis acidity of boron (B) in the network of polymer chains is less shielded by the connected PEG chains, which is more effective to improve lithium ion transference number ( t L i + ) and reduce the interfacial polarization of LiFePO 4 /HSPE/Li cells by attracting the anions of lithium salt . The t L i + increases monotonously along with the increase of B-PEG contents in HSPE, while the ion conductivity has a peak value. When B-PEG content is 23.1 wt%, the highest ionic conductivity of the hybrid polymer electrolyte reaches up to 1.6 × 10 −4 S/cm and t L i + is 0.68 at 25 °C. And the initial capacity of LiFePO 4 /HSPE/Li cells are 120 mAh/g and 90 mAh/g at 0.5C and 1C at 25 °C. After 100 cycles under 1C at 25 °C, the capacity retention of the LiFePO 4 /HSPE/Li cell is 84%, which is higher than that of 65% for LiFePO 4 /PSPE/Li cell. (PSPE indicates the Si-PEG polymer electrolytes with B-PEG just as plasticizer).
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Liu Yang,Jiachen Guo,Ling Zhang,Chunzhong Li
The rapid development of integrated circuits and micro-devices has brought serious thermal failure and huge fire hazards to polymer composites due to the inefficient heat dissipation. Here, in order to simultaneously achieve the excellent thermal conductivity (TC) and flame retardancy (FR) of composites, we proposed a strategy of grafting a flame retardant on the surface of an exfoliated boron nitride nanosheet (BNNS). Briefly, the atom transfer radical polymerization (ATRP) reaction was initiated on the surface of the BNNS with predeposited polydopamine to obtain poly(glycidyl methacrylate) (PGMA) chain with high graft density, and then the flame-retardant molecule 6H-dibenz(C,E)(1,2)oxaphosphorin-6-oxide (DOPO) was further decorated to form a flame-retardant functionalized BNNS with branched structure. Due to the improvement of interfacial compatibility, the BNNS exhibits uniform dispersion and robust interfacial interaction with the epoxy resin (EP), which will further promote the formation of heat conduction paths and the reduction of interfacial thermal resistance (Rb). In particular, the EP composite containing 30 wt % BNNS-DOPO exhibits a TC of 1.25 W/m·K, exceeding that of the composite loaded with serious aggregated BNNS by 32%. Simultaneously, the EP composite with only 20 wt % BNNS-DOPO presents a superior FR with an obvious decrease in the values of peak heat release rate (PHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP) compared to EP, corresponding to a reduction of 47.6, 44.7, 46.5, and 50%, respectively. The enhanced FR is mainly ascribed to the catalytic carbonization of DOPO, and the continuous and compact protective layer formed by the char combined with the BNNS effectively prevents the exchange of heat, oxygen, and volatile gases. Therefore, this surface modification strategy of the BNNS provides a new idea for exploring thermally conductive and flame-retardant composites.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xianhua Hou,Miao Zhang,Jiyun Wang,Shejun Hu,Xiang Liu,Zongping Shao
A high yield and low-cost high-energy wet ball milling method is used for producing nano-flake Si@SiO 2 as an anode material for Li-ion batteries. After a two-step ball milling (coarse milling and fine milling) process, the irregular plate-like micrometric Si (average particle size is 27.4 μm) is fractured into nano-flake Si@SiO 2 (average particle size is 154.8 nm) with small crystalline grains and abundant grain boundaries. Due to the significant changes of the prepared nano-flake Si@SiO 2 in the surface composition, particle size and crystal structure, the ball milled Si shows better electrochemical performance compared with the as-received micrometric Si. And the fine milled Si shows the best electrochemical properties with a high initial coulombic efficiency of 84.6% and a specific capacity of 1920.4 mA h g −1 at a current density of 100 mA g −1 after 100 cycles.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Jiani Guo,Xin Song,Yan Su,Yiran Zou,Renke Kang,Shang Gao
Polarity-dependent CMP behavior of 4H-SiC Si-face and C-face is systematically investigated. • The C-face exhibits higher material removal rate and stronger oxidation tendency. • A thicker oxygen-rich reacted layer forms on the C-face during CMP. • Enhanced interfacial charge transfer promotes oxidant–surface interactions on the C-face. • First-principles calculations reveal the origin of polarity-dependent CMP behavior. Chemical mechanical polishing (CMP) of SiC is fundamentally limited by its high hardness and chemical inertness, as well as the pronounced polarity-dependent anisotropy between the Si-face (0 0 0 1) and C-face (0 0 0 −1). In this work, the intrinsic mechanism governing polarity-dependent oxidation and material removal of 4H-SiC is systematically investigated by combining CMP experiments, surface characterization, electrochemical analysis, and first-principles calculations.Under identical polishing conditions, the C-face exhibits a significantly higher material removal rate (1900 nm·h −1 ) and lower surface roughness (0.13 nm) compared to the Si-face (1000 nm·h −1 , 0.65 nm). Electrochemical results reveal faster oxidation kinetics on the C-face, which is further confirmed by the formation of a thicker oxide layer and enhanced oxygen-containing species. DFT calculations demonstrate that the C-face possesses higher surface energy, lower work function, and stronger charge transfer capability, leading to more favorable oxidant adsorption and interfacial reactions. These results reveal that the superior CMP performance of the C-face originates from its intrinsically enhanced electronic activity and oxidation-assisted removal capability. This work establishes a clear structure–property–performance relationship for polarity-dependent CMP of SiC and provides new insights for improving polishing efficiency and achieving wafer-level uniformity. Download: Download high-res image (234KB) Download: Download full-size image
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高影响因子
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