LUMINESCENCE
·
2024
·Vol. 39
·期 11
·1-8
·
IF 3.2
Zhigang Wang,Jiayu Wang,Dangli Gao,Wenqian Xu,Wenna Gao,Xiangyu Zhang,Sining Yun,Xiaojun Wang
Double wavelength emitting phosphors with hypersensitive thermal response are important for optical/thermal sensors and multiplexing optical data storage technology. However, it is a daunting challenge to develop multicolor electron-trapping materials with superheat sensitivity and anomalous quenching luminescence characteristics for information storage. Here, based on the selection of host lattice and the control of doping ion types, we have designed Mn 2+ - and/or Cr 3+ -activated persistent materials with excellent fluorescence properties. Among these phosphors, Mn,Cr co-activated biphasic mixture exhibits not only sensitive anomalous thermosensitive fluorescence properties but also multicolor and multimode fluorescence emission characteristics derived from Mn and Cr simultaneously. The corresponding multimode fluorescence mechanism is proposed based on afterglow energy transfer and deepening trap effect. Especially, based on the excellent fluorescence performances, these phosphors as information storage medium demonstrate multilevel information storage by a combination of the trap multiplexing and wavelength multiplexing technologies. The study here provides not only the ideas for designing and synthesizing new electronic materials but also a material foundation for the fourth generation of optical information storage and encryption.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Youjie Sheng,Haoyu Li,Hanling Zhang,Yang Li,Baohu Li,Li Ma
Nanoparticles (NPs) and polymers are frequently combined to improve firefighting foam performance, but whether the effect of polymer addition depends on NP type remains unclear. In this study, Al(OH)₃ and β-Al₂O₃ NPs were separately incorporated into an FS-50/APG-0810 surfactant system and further combined with xanthan gum (XG) or guar gum (GG). The foaming ability, rheology, and drainage resistance of the resulting foams were systematically compared, while crossover strain and modulus of cohesion (MOC) were used to characterize deformation tolerance and resistance to structural breakdown. Polymer addition produced opposite effects in the two NP systems: XG and GG generally weakened the rheological properties and drainage resistance of Al(OH)₃ NP-stabilized foams, but enhanced those of β-Al₂O₃ NP-stabilized foams. Selected β-Al₂O₃ formulations were further evaluated for fire suppression performance. Among the tested formulations, the β-Al₂O₃/XG foam achieved the shortest extinguishment time of 22 s, whereas the β-Al₂O₃/GG foam exhibited the longest burn-back time of 1243 s. Unlike previous studies focusing on individual NP or NP/polymer systems, this work demonstrates that polymer-induced foam regulation is strongly dependent on NP type and that nanoparticle/polymer combinations do not necessarily produce universal synergistic effects. These findings provide a basis for rational NP/polymer matching to balance rapid extinguishment and burn-back resistance in firefighting foam formulation. Download: Download high-res image (243KB) Download: Download full-size image
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Nanoscale
·
2019
·Vol. 11
·期 18
·8967-8977
·
IF 6.97
Li Li,Rui Zhao,Tinghua Xu,Dandan Wang,Du Pan,Kun Zhang,Caiyan Yu,Xia Lu,Guanjie He,Ying Bai
LiNi0.5Mn1.5O4 (LNMO) spinel has drawn increasing attention due to its high voltage, stabilized electrochemical performance and safety features as a cathode for lithium-ion batteries. However, the main challenge lies in its unstable surface structure, especially at elevated temperatures. In this paper, we decorate the LNMO precursor with a solid electrolyte of Li1.4Al0.4Ti1.6(PO4)3 (LATP) via a facile sol–gel method, followed by a co-crystallization process at 820 °C, to successfully generate a LATP modification shell at the surface of LNMO. The LATP modification shell could not only optimize the morphology of LNMO including the limitation of particle growth and control of crystalline orientation, but also realize ion doping during the co-crystallization process. By tuning the LATP contents, the 2 wt% LATP modification is found to be the most effective at balancing the interfacial stability and Li+ diffusion kinetics of LNMO, as well as enhancing its rate capability and capacity retention at high temperatures. As a result, the 2 wt% LATP-modified LNMO cathode exhibits a high reversible capacity of 84.8 mA h g−1 after 500 cycles with a capacity retention of 68.9%, and a superior rate capability (102.0 mA h g−1 at 20 C) at room temperature. Moreover, this electrode also delivers a good capacity retention of 85.7% after 100 cycles at 55 °C, which is ascribed to the stabilized interface with a LATP protective layer.
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GREEN CHEMISTRY
·
2021
·Vol. 23
·期 7
·2640-2651
·
IF 10.182
Zhicheng Jiang,Mi Gao,Javier Remón,Wei Ding,Changwei Hu,Bi Shi
This work addresses the manufacturing of a pioneering chrome-free tanning agent, consisting of ‘Al–Zr-oligosaccharides’ produced from biomass. First, a microwave-assisted AlCl3–H2O2–H2O reaction system was used for the simultaneous degradation and oxidation of hemicellulose in corncob. The obtained aqueous solution containing ‘Al-oligosaccharides’ was then combined with Zr to produce water-soluble ‘Al–Zr-oligosaccharides’. These species behaved as a ‘Trojan horse’, allowing the uniform and controlled penetration of Al and Zr into the leather, avoiding their accumulation on the surface. The effects of the reaction temperature and the AlCl3 and H2O2 concentrations used during the synthesis were systematically analyzed. Increases in the temperature and AlCl3 concentration improved the hemicellulose conversion, while the use of high H2O2 concentrations augmented the amounts of –CHO/–COOH functionalities in the oligosaccharides, with both phenomena being paramount for the efficient formation of ‘Al–Zr-oligosaccharides’. However, more severe reaction conditions led to the formation of an undesirable species, negatively influencing the tanning performance and chromaticity of the tanning agent. Given this, these parameters were optimized, and it was found that it is possible to convert up to 72 wt% of the hemicellulose present in corncob into an ‘advanced Trojan horse tanning agent’ contained in a colorless water solution, conducting the synthesis at 129 °C with a solvent comprising 56 mM AlCl3 and 2.6 vol% H2O2. The application of this solution for leather tanning provided leather with a shrinkage temperature as high as 87 °C, thus meeting the restrictive requirements of the leather industry. Therefore, these results are a landmark achievement in this field and represent a step forward to a sustainable and renewable leather industry.
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COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Xiaobin Zhan,Guanghui Zhu,Lei Yu,Ruyi Hu,Yiru Ren,Hongyong Jiang
To improve the bonding strength of CFRP/Al joints, a novel hierarchical interface through anodization, ZnO nanosheet growth and improved Resin Pre-Coating (RPC) with nano-SiO 2 is designed and its hierarchical failure mechanisms are studied. Porous Al substrates are prepared via anodization, followed by in-situ growth of ZnO nanosheets and infiltration of RPC solution containing nano-SiO 2 to enhance mechanical interlocking at nano-scale. Systematic characterizations including single-lap shear testing, SEM and XRD are conducted to evaluate interfacial morphology, wettability and mechanical properties. Results show that optimal porous surface microstructure and interfacial wettability are obtained by the effect analysis of anodizing time. In surprise, the combined treatment of ZnO nanosheets and improved RPC with nano-SiO 2 shows an increase in the shear strength over 400 % compared to untreated joints. Macro and micro failure modes reveal that the interfacial failure is transitioned to cohesive failure with fiber tearing and resin/SiO 2 interface debonding. The synergistic strategy effectively improves the hierarchical failure through enhanced nano-interlocking and adhesive reinforcement, offering a promising pathway for designing and manufacturing high-strength CFRP/Al joints.
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CHEMOSPHERE
·
2022
·
IF 8.943
Xiao Tan,Yinjie Zhang,Meng Liu,Jinman Cao,Guilan Duan,Jun Cui,Aijun Lin
Cr(VI) contamination in aquatic systems has been a challenge for environmental science researchers. To environmental-friendly, stable, and efficiently remove Cr (VI), a novel layered double hydroxide was prepared through the ultrasonic-assisted co-precipitation method. The ultrasonic-assisted step prevented the Fe 2+ oxidation, improved the morphology and performance, and finally, the adsorption-coupled reduction capacity and stability were enhanced. By adding U–Fe/Al-LDH (1.0 g/L) for Cr(VI) (100 mg/L), the removal rate reached 82.24%. The removal data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm model. Using U–Fe/Al-LDH can be performed over a wide pH range (2–10), with a theoretical maximum removal capacity of 118.65 mg/g. The Cr(VI) with high toxicity was adsorbed and reduced to low-toxicity Cr(III). In the final phase, stable Cr(III) complex precipitates were generated. After 30 days, the dynamic leaching amounts of total Cr in used U–Fe/Al-LDH-2 were 0.1052 mg/L. Combined with the results of the influence experiment of coexisting anions and oxidants and the SO 4 2− release experiment, the stability of the removal effect and the safety of U–Fe/Al-LDH were proved. In conclusion, U–Fe/Al-LDH-2 is a promising remediation agent and a feasible Cr(VI) removal method for the practical remediation.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Lin Cao,Yuanyuan Wang,Xueqing Yu,Zhilun Lu,Ge Wang,Minmin Mao,Bing Liu,Lei Cao,Hadi Barzegar Bafrooei,Matjaz Spreitzer,Dawei Wang,Kaixin Song
Ultra-low permittivity ( ε r ：4–5) Mg 2 Al 4– x (Ge 0.5 Mg 0.5 ) x Si 5 O 18 (0.12 ≤ x ≤ 0.28) and Mg 2 Al 4– y (Mn 0.5 Mg 0.5 ) y Si 5 O 18 (0.1 ≤ y ≤ 0.3) cordierite ceramics were fabricated by solid-state reaction method. The improvement in [(Si 4 Al 2 )O 18 ] hexahedral ring roundness significantly enhances the quality factor through the substitution of complex ionic pairs of Ge 0.5 Mg 0.5 /Mn 0.5 Mg 0.5 for Al lattice sites in the [(Si 4 Al 2 )O 18 ] hexahedral ring of these cordierite ceramics. Excellent microwave dielectric performances of Mg 2 Al 3.8 (Ge 0.5 Mg 0.5 ) 0.2 Si 5 O 18 and Mg 2 Al 3.8 (Mn 0.5 Mg 0.5 ) 0.2 Si 5 O 18 ceramics sintered at 1400 °C were demonstrated using the Hakki-Coleman resonant method with ε r = 4.676, Q×f = 186, 503 [email protected] GHz and 199,476 GHz @ 27.434 GHz, τ f = −20.02 ppm/°C and ε r = 4.807, Q×f = 101,420 [email protected] GHz and 143,005 GHz @ 27.366 GHz, τ f = −26.44 ppm/°C, respectively. These results present the potential application of high-quality cordierite in future B5G/6 G millimeter and terahertz communication frequency bands.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 21
·6037-6046
·
IF 5.726
Min Zhong,Jungang Wang,Congbiao Chen,Zhancheng Ma,Litao Jia,Bo Hou,Debao Li
Herein, the shell–core-structured SiC–Al2O3@Al composite consisting of an Al metal core and a SiC–Al2O3 hybrid shell was synthesized by a straightforward preparation method. Compared with Al2O3@Al composites, the SiC-modified samples possess a meso–macroporous structure, high pore volume, wide pore size, and a special surface where active and inert components coexist. The ratio of inert to active components on the composite surface could be modulated by controlling the amount of SiC nanoparticles (NPs). Upon the decoration of SiC NPs, the degree of reduction of cobalt oxides and the density of active sites (Co0) increased significantly. Moreover, the SiC-modified catalysts exhibited lower apparent activation energy (Ea) and higher intrinsic reaction rate (TOF) mainly due to the electron-rich properties of Co NPs in the modified samples. Accordingly, the cobalt-weight normalized FT activity (CTY) of the SiC-modified catalysts increased by a factor of about 1.6–2.0. Moreover, the catalyst modified by the SiC NPs showed lower selectivity towards light hydrocarbons (CH4 and C2–C4) but higher selectivity towards long-chain hydrocarbons (C5+). When the mSiC/mAl ratio was 15%, the CoAC-15 catalyst showed maximum density of active sites and highest TOF, leading to highest activity and C5+ selectivity (approximately 92%). The synergistic effect of the SiC–Al2O3 hybrid shell and the Al metal core was beneficial for the catalytic properties of the Co/SiC–Al2O3@Al catalysts. The binary SiC–Al2O3 nanostructure endowed the Co NPs with electron-rich characteristics to enhance the CO activation; moreover, the special surface where the active and inert components coexisted improved the reducibility of cobalt oxides, and the abundant porosity of the hybrid shell facilitated the transfer of reactants and products. In addition, the existence of the Al metal core improved heat transfer in the reaction.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jiang Chang,Ying Qin,Weimin Guo,Jingyuan Zhang,Kuo Zhang,Jianhua Zheng,Lijian Sun,Qiu Fu
The facile and eco-friendly fabrication of a fabric with remarkable flame retardancy, anti-ultraviolet (UV), and superhydrophobic properties is of significant interest for multitask requirements. In this regard, herein, a nonfluorine, facile, and green method is reported for in situ synthesis of metal-organic frame (NH 2 -MIL-53(Al)) on hemp fabric (HF) for the preparation of multifunctional textiles. A homogeneous and compact coating of NH 2 -MIL-53(Al) crystals was deposited on HF, followed by modification with triethoxyoctylsilane (TEOS) to manufacture superhydrophobic NH 2 -MIL-53(Al)@hemp fabric (SM(Al)HF-9), significantly enhancing its water stability. The SM(Al)HF-9 exhibited superior superhydrophobicity properties, with a water contact angle (WCA) up to 156°. Furthermore, the surface of SM(Al)HF-9 cannot be adhered by dye solution and powder, indicating its good self-cleaning and anti-fouling abilities. The SM(Al)HF-9, characterized by a porous structure, effectively separates tetrachloromethane and n-hexane from water mixtures with a separation efficiency exceeding 97 %. The SM(Al)HF-9 has excellent UV-blocking properties, and the UV protection factor is as high as 105.44. Encouragingly, the SM(Al)HF-9 exhibited outstanding flame retardancy, as demonstrated by its self-extinguishing capability and a substantially improved limiting oxygen index (LOI) of 32.4 %. In comparison to raw HF, the peak heat release rate (PHRR) and total heat rate (THR) of the modified HF are reduced by 76.15 % and 54.32 %, respectively. Meanwhile, the NH 2 -MIL-53(Al) has a significant advantage over other MOFs (e.g., ZIF-67, Ce-MOF, Ag-MOF, Fe-MOF and MIL-53(Al)) in improving the flame retardancy of HF. The highly efficient flame-retardant, anti-UV, and superhydrophobic fabric is promising in home and public decoration, and fire protection fields.
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POWDER TECHNOLOGY
·
2026
·
IF 5.5
Xiya Qiao,Yaqiang Yuan,Zhijun He,Jihui Liu,Wenlong Zhan,Lihua Gao,Xiao Han,Haibin Zuo
Increasing Fe/Al molar ratio promoting better assimilation of iron ore powder. • The inter-particle bonding ability of SFCA can be evaluated by osmotic pressure. • Lower Fe/Al ratios coupled with slower cooling promote dendritic SFCA formation. • Higher crystallization rate enhances hardness but reduces elastic modulus of SFCA. • Optimizing SFCA micromechanical properties through Fe/Al ratio and cooling rate. Iron ore sintering represents a critical agglomeration process wherein the silico-ferrite of calcium and aluminum (SFCA) phase governs the consolidation behavior and final product quality. In this study, the effects of Fe/Al molar ratio (4.53 to 12.27) and cooling rate (50 to 200 °C/min) on SFCA characteristics in Fe 2 O 3 -CaO-SiO 2 -Al 2 O 3 systems were systematically investigated by using X-ray diffraction, in situ thermal analysis platform, Raman spectroscopy, Scanning electron microscope (SEM) and nanoindentation. Increasing Fe/Al ratio could reduce the liquid phase formation temperature and enhance the melt fluidity, promoting better assimilation of iron ore powder. Meanwhile, optimal inter-particle bonding occurred with optimal osmotic pressure achieved at 300 to 350 s of high-temperature maintenance. Higher cooling rates significantly accelerated crystallization kinetics, leading to refined microstructures with dispersed crystalline phases. Notably, lower Fe/Al ratios coupled with slower cooling promoted dendritic SFCA formation, while accelerated crystallization enhanced hardness but compromised elastic modulus. The influence of slower cooling rates on crystallization rate and micromechanical properties was more pronounced in sintered liquid phases with lower Fe/Al molar ratios. These findings provide crucial insights into the fundamental mechanisms governing SFCA formation in iron ore sintering, offering practical strategies for optimizing sintering parameters through precise regulation of chemical composition and thermal conditions. Download: Download high-res image (126KB) Download: Download full-size image
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Yuanqiong Mu,Tong Wang,Mei Zhang,Min Guo
Lithium silicate (Li 4 SiO 4 ), an efficient CO 2 high-temperature sorbent , has become the research hotspot in CO 2 capture due to its large theoretical adsorption capacity and fast rate. How to further reduce production cost while ensuring the adsorption performance has become the key to industrial application. In this work, using Al, Fe, Ti co-doped SiO 2 aerogel synthesized from fly ash as silicon source, Li 4 SiO 4 sorbents were achieved through solid-state calcination method. The influences of preparing conditions on the microstructure and CO 2 capture property were systematically investigated. Under the optimum conditions, the as-prepared Li 4 SiO 4 demonstrated the best CO 2 adsorption capacity of 33.24 wt% within 7.0 min. Particularly, the CO 2 capture capacity remained 23.38 wt% (>70% of the first value) after 35 cycles, indicative of long cycle stability. Moreover, the kinetic characteristics of CO 2 adsorption process could be well simulated by the double exponential model, and the diffusion process of Li + /O 2− ions was the decisive step of the whole adsorption reaction. Compared with Li 4 SiO 4 by pure reagents, the sorbent from fly ash-based aerogel exhibited competitive adsorption capacity, which provides a new cost-effective way to synthesize CO 2 high-temperature sorbent with super capture performance and good cycle stability.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Qiuling Yin,Peng Lyu,Guanghui Wang,Bing Wang,Yingjie Li,Zhongkui Zhou,Yadan Guo,Lianfang Li,Nansheng Deng
The decommissioning of uranium tailings (UMT) is usually accompanied by uranium (U) contamination in soil, which poses a serious threat to human health and ecological security. Therefore, the remediation of uranium pollution in soil is imminent from ecological and environmental points of view. In recent years, the use of biochar stabilizers to repair uranium tailings (UMT) soil has become a research hotspot. In this study, a novel phosphorus-modified bamboo biochar (PBC) cross-linked Mg–Al layered double-hydroxide composite (PBC@LDH) was prepared. The hyperaccumulator plant Indian mustard ( Brassica juncea L.) was selected as the test plant for outdoor pot experiments, and the stabilizers were added to the UMT soil at the dosage ratio of 15 g kg −1 , which verified the bioconcentrate and translocate of U and associated heavy metal Pb in the UMT soil by Indian mustard after stabilizer remediated. The results shown that, after 50 days of growth, compared with the untreated sample (CK), the Indian mustard in PBC@LDH treatment possessed a better growth and its biomass weight of whole plant was increased by 52.7%. Meanwhile, the bioconcentration factors (BF) of U and Pb for PBC@LDH treatment were significantly decreased by 73.4% and 34.2%, respectively; and the translocation factors (TF) were also commendable reduced by 15.1% and 2.4%, respectively. Furthermore, the Tessier available forms of U and Pb in rhizosphere soil showed a remarkably decrease compared with CK, which reached by 55.97% and 14.1% after PBC@LDH stabilization, respectively. Complexation, precipitation, and reduction of functional groups released by PBC@LDH with U and Pb described the immobilization mechanisms of biochar stabilizer preventing U and Pb enrichment in Indian mustard. As well as, the formation of U-containing vesicles was prevented by the precipitation of −OH functional groups with free U and Pb ions around the cell tissue fluids and vascular bundle structure of plant roots, thereby reducing the migration risk of toxic heavy metals to above-ground parts. In conclusion, this research demonstrates that the PBC@LDH stabilizer offers a potentially effective amendment for the remediation of U contaminated soil.
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