Metals
·
2018
·Vol. 8
·期 7
·481
·
IF 1.704
He Gao,Fuxiang Wei,Yanwei Sui,Jiqiu Qi,Yezeng He,Qingkun Meng
This study designed (Ti0.55Cu0.20Zr0.15Ni0.10)1−xSixamorphous alloys based on binary deep eutectics and examined the effect of silicon (Si) on the amorphous forming ability of the filler alloys. The results show that a certain amount of Si added to the filler metals could improve the amorphous forming ability of the alloys. Under the same experimental conditions, the Ti0.55Cu0.20Zr0.15Ni0.10filler metal with 0.5 wt % Si had the strongest amorphous forming ability compared to the other filler alloys containing different amounts of Si; its reduced glass transition temperature (Trg) was 0.5554, and its supercooled liquid phase region width (∆Tx) reached 60 °C. The (Ti0.55Cu0.20Zr0.15Ni0.10)99.5%Si0.5%filler metal designed in these experiments presented good amorphous forming ability and wettability. The brazed joint of SiC and TC4 obtained with this amorphous filler metal showed a shear strength of 102 MPa, indicating an increase of 122% compared to the brazed joint obtained with the filler metal without Si.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jinfeng Jiang,Wei Xia,Yu Feng,Weihua Gu,Weiwei Wang,Cao Wu,Wenbo Du,Yong Yang,Hailiang Deng,Yusuke Yamauchi
Ceramic fibrous aerogels are promising lightweight thermal insulators, yet concurrently enhancing mechanical robustness, acoustic attenuation and electromagnetic (EM) wave absorption remains challenging because these functions demand conflicting architectures. Here we introduce a phase-transition-driven multiphase evolution strategy in Si Zr crystals combined with a one-step thermally induced core–shell conversion. This approach enables coordinated regulation of the chemical states, dislocation density and oxygen-vacancy concentration in Zr Si ceramic fibers, and forms a heterogeneous “oxide shell (ZrO 2 /SiO 2 )-carbide core (SiC/ZrC)” within each fiber. The resulting interfacial enrichment and improved impedance matching synergistically strengthen the aerogel and boost EM dissipation. The obtained ZSCO fibrous aerogels deliver a compressive stress up to 255.73 kPa, a minimum reflection loss of −21.87 dB and an average sound absorption coefficient of 0.61. Mechanistic analysis reveals a thermally driven, multimodal regulation pathway for tailoring multifunctional ceramic fibers, offering a scalable route to aerogels for extreme environments.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Linjing Liu,Bin Yang,Rui Lv,Qiangwei Kou,Shuai Yang,Hang Xie,Yuan Sun,Yunfei Chang,Shan-Tao Zhang,Fei Li
Piezoceramics with high and fatigue-resisted piezoelectric properties are strongly desired for actuator applications. In this work, textured Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zr, Ti)O 3 ceramics with Lotgering factor F 001 ∼98% were fabricated by templated grain growth technique. Strong [001] c -grain orientation ( f ∼90% and r ∼0.22) of the textured ceramics effectively produced about 230% enhanced piezoelectric coefficient d 33 * (i.e., S max / E max ) and substantially improved unipolar electrical fatigue resistance. Unipolar polarization P max and d 33 * of the textured ceramics were nearly maintained up to 10 6 unipolar cycles, while 19% and 14% degradations were respectively observed from randomly oriented counterparts. Especially, normalized d 33 * of the textured ceramics shows better unipolar fatigue resistance than those of piezoceramics reported previously. Much lower bipolar strain asymmetry γ s (∼4%) was observed from the textured samples fatigued after 10 6 unipolar cycles as compared to γ s ∼23% for randomly oriented counterparts. While charged defect accumulation model described the serious fatigue deteriorations in randomly oriented ceramics, the current work revealed that substantially enhanced unipolar fatigue resistance of the textured ceramics is mainly associated with the inherent fatigue anisotropy, weakened local bias fields owing to both enhanced domain mobility and lower defect density near grain boundaries/interfaces, and increased intrinsic contribution due to more tetragonal content. These superior characteristics suggest the great potential of textured ceramics for high-performance and robust actuator applications.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Jian Sun,Shengbin Bai,KeKe Li,Yue Zhou,Yuning Chen,Lei Liu,Zijian Zhou
CaCO3/CaO materials possess the advantages of low cost, high energy storage density, and working temperature, which offer these materials the potential to be used in thermochemical energy storage systems for concentrated solar power plants. However, CaCO3/CaO materials possess poor antisintering and optical absorption abilities, largely limiting their practicability for direct solar utilization. In this study, binary ion doping of Fe/Mn and Zr-based stabilizer incorporation were simultaneously conducted to improve the cyclic thermal energy storage/release performance of CaCO3/CaO materials. The spectral absorbance of synthetic CaO-based composites (ranging from 77.8% to 84.0%) doped with binary ions of Fe/Mn is greatly increased in comparison to that of pure CaO (∼12.2%) due to the generation of black Ca2Fe2O5 and Ca4Mn3O10. The cyclic thermal energy storage/release performances of synthetic CaO-based composites were comparatively investigated under two thermal energy storage modes (CSP-N2 and CSP-CO2). The Zr-doped, CaO-based composites exhibit a cycling stability superior to those of Zr-free CaO-based composites due to the generated inert CaZrO3 with desirable antisintering ability, and the superiority is more prominent under CSP-CO2 mode. After 50 cycles, the CaO-based composite with a molar ratio of Ca:Zr = 100:6.7 exhibits a remarkably stable energy release density of 1.02 MJ/kg under CSP-CO2 mode, retaining 88.9% of its initial energy release density.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Xueting Liu,Chunhui Hu,Jingjing Wu,Peng Cui,Fengyu Wei
In this study, a series of metal–organic frameworks (MOFs) NH 2 -UiO-66- x HAc catalysts were synthesized by solvothermal method using acetic acid (HAc) as a modulator, and were applied to the cycloaddition of CO 2 and epichlorohydrin (EPIC) under ambient pressure. Influences of the modulation by HAc on morphologies and structures of the MOFs are demonstrated via PXRD, FESEM, FTIR, N 2 adsorption–desorption, XPS and 1 H NMR characterizations. The results show that the MOFs containing mesoporous pores can be prepared by adjusting the concentration of HAc. By optimizing the amount of HAc added, the specific surface area of NH 2 -UiO-66-8HAc is as high as 879.17 m 2 ·g −1 , which is 28.3% higher than that of the original MOFs. And the evaluation of catalytic performance showed that HAc modulation enhanced the activity of NH 2 -UiO-66- x HAc under mild conditions. The exposure of Lewis acid sites, increased specific surface area and porosity via the modulation of HAc defective ligand can be supposed the key factors to determine the enhanced catalytic activities. In addition, considering the influence of gas concentration on the reaction, the concept of TOP (Turnover of Pressure, defined as the mass of conversions of a unit mass catalyst under unit pressure and unit time) was first proposed in this article.
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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Dehong Fan,Xiaobang Liu,Kai Qi,Zhenyu Chen,Yubing Qiu,Bokai Liao,Xingpeng Guo
A smart-sensing coating is developed by adding a dual-emission fluorescent zirconium metal-organic framework/rhodamine B composite (Zr-MOF@RhB) into the commercial epoxy resin coating, which can autonomously detect and distinguish the damage of surface coating and the corrosion of substrate aluminum . The orange-yellow fluorescence can be observed to identify the area of mild coating damage without metal corrosion, resulting from the cumulative release of Zr-MOF@RhB with the emission wavelength of 583 nm. In case of the occurrence of aluminum corrosion, the fluorescence color turns from orange-yellow to green, in which the emission behavior of Zr-MOF@RhB at 490 nm is greatly enhanced with the presence of Al 3+ ions. The smart-sensing ability can availably and robustly operate in the conditions of long term, wide ranges of pH and temperature, and diverse interfering substances. This simple and powerful warning system relying on fluorescent MOFs would not only extend the practical applications of MOFs but also be a promising candidate for smart coating strategies.
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Processes
·
2021
·Vol. 9
·期 9
·1487
·
IF 2.847
Muhammad Faizan,Kifayat Ullah Khan Niazi,Hasnain Nawaz,Niaz Muhammad,Hao Li,Fei Dai,Ruirui Zhang,Ruixia Liu,Suojiang Zhang
In recent work, deep eutectic solvents (DESs) as ionic liquid analogues have been abundantly used in catalysis. Herein, vanadium phosphorus oxide (VPO) catalysts were synthesized from mono-, bi-, and tri- metallic DES of Nb, Zr, and Mo metal dopants as structure-directing agents and electronic promoters for n-butane selective oxidation towards maleic anhydride. Higher MA selectivity and larger n-butane conversion was successfully obtained using the newly developed catalysts, while oxidation by-product COx(CO, CO2) was minimized. Characterization techniques including FTIR, DSC, XRD, TEM, SEM, EDS, Raman spectroscopy, TGA, XPS, and NH3-TPD were employed to fully characterize the DESs, precursors and catalysts. This work led to an increase of 7.8% in MA mass yield with 16% more n-butane conversion as compared to an unpromoted VPO catalyst. Moreover, the utilization of a low-carbon alkane brought in a green impact on the chemical plant as well as the environment.Keywords:deep eutectic solvent;vanadium phosphorus oxide;n-butane selective oxidation;structure directing agent;electronic promoter
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Hongrong Mei,Liangbin Zhang,Chunchun Li,Zhenggang Rao,Longlong Shu
Two garnet-structured Ca 3 MgBGe 3 O 12 (B = Zr, Sn) ceramics with tetravalent cations at B-site were prepared by conventional solid state reaction. The crystal structure, microstructure evolution, and microwave dielectric performance were investigated using X-ray powder diffraction, Rietveld refinement , scanning electron microscopy, Raman spectroscopy , and infrared spectroscopy techniques . Dense Ca 3 MgZrGe 3 O 12 and Ca 3 MgSnGe 3 O 12 ceramics were obtained at sintering temperatures of 1420 and 1400 °C, respectively. The dielectric constant, unloaded quality factor, and temperature coefficient of resonance frequency of Ca 3 MgZrGe 3 O 12 were 10.80 ± 0.2; 79,600 ± 1000 GHz ( f = 12.61 GHz); and −66.8 ± 1 ppm/°C, respectively, and the corresponding values for Ca 3 MgSnGe 3 O 12 were 9.68 ± 0.2; 83,400 ± 1000 GHz ( f = 14.19 GHz); and −57.9 ± 1 ppm/°C, respectively. The dielectric performances of the two ceramics were compared by analyzing the ionic polarizability, packing fraction, and bond valence. The intrinsic dielectric properties were predicted by fitting the infrared reflectivity spectra.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2020
·
IF 4.748
Mei Zhong,Da Zou,Yuebing Xu,Lijun Jin,Yue Pan
Acid treated kaolinites (KA) were successively loaded with Zr and Fe, Ni or Co component to control the product distribution and upgrade the tar quality in coal pyrolysis . The structure of the resultant catalysts was characterized and their catalytic performance in the pyrolysis of demineralized low-rank coal and benzyl phenyl ether (BPE), a model compound containing C al -O bridge bond, were investigated. Results show that the introducing of Zr into the KA can enlarge the hysteresis loop due to the stacking of ZrO 2 particles. The acidities, especially the strong ones, increase as the Zr content is below 8 wt% (KA-8Z). When adding Fe, Ni or Co metals into the KA-8Z, the number of Brønsted acid sites obviously decreases, but Lewis acid sites increase. The maximum BPE conversion of 94.0% occurs for the KA-8Z, further metal-loaded sample promotes the cleavage of C al -O bond in BPE and the formation of active H radicals from CH 3 OH, leading to the increase of BPE conversion. Besides, remarkable enhancement of target monomeric aromatics is observed for the Fe, Ni and Co-loaded samples. Compared with the pyrolysis without catalyst, the tar yield as well as pitch content decrease over the KA-8Z and its metal-modified catalysts. Wherein, Ni-KA-8Z has the highest activity for tar upgrading, leading to the largest increase in the contents of light oil and phenol oil. In-situ pyrolysis by time-of-flight mass spectrometry reveals the enhanced dissociation of weak covalent bonds linked in the coal skeleton over the KA-8Z and Fe, Ni and Co-modified catalysts, resulting in a decrease in the peak temperature for product release. A marked increase in phenols and diphenols confirms a promoted dissociation of ether bond in coal.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Jingjing Wang,Jun Wei
Zr(IV)-crosslinked carboxymethyl cellulose/carboxymethyl chitosan hydrogels were prepared using polyethylene glycol (PEG) as pore-forming agent. The hydrogels exhibited porous structure and the pore size increased with the PEG content. The obtained hydrogels were used as adsorbents for removal of phosphate from aqueous solutions. The hydrogel prepared with most amount of PEG displayed largest adsorption amount of phosphate. This result might be attributed to improvement of surface area and pore volume caused by introduction of PEG, which could boost exposure of adsorption sites in the hydrogel and enhance the diffusion of phosphate into interior of the hydrogel. The phosphate adsorption achieved equilibrium within 400 min and the removal process followed pseudo-second-order kinetic model. The maximum adsorption capacity was reached at pH = 2.0, and the adsorption capacity gradually increased with temperature. In the presence of coexisting anions, SO 4 2− ions exerted much more negative effect on phosphate adsorption than Cl − and NO 3 − ions. The phosphate adsorption mechanism was related to electrostatic interaction, ligand exchange and ion exchange. Moreover, the hydrogel exhibited relatively stable adsorption capacity after six adsorption/desorption cycles. The present study presented a facile method for preparing an excellent hydrogel adsorbent for phosphate removal from aqueous solutions.
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PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Chao Xia,Yan Xu,Meng-Meng Cao,Yun-Peng Liu,Jin-Feng Xia,Dan-Yu Jiang,Guo-Hong Zhou,Rong-Jun Xie,Da-Feng Zhang,Hui-Li Li
In the present study, a kind of Eu(III) post-functionalized Zr(IV)-based metal-organic framework (UiO-66(COOH) 2 , Zr-MOF: Eu 3+ ) was synthesized and utilized as an independently luminescent probe for sensing bilirubin (BR) in human serum, a biomarker of jaundice hepatitis. It can be served as a turn-off fluorescent switch for BR because its red emission from Eu 3+ can be easily quenched by BR through a fluorescent resonant energy transfer (FRET) process between BR and its ligands, and as a result, BR is recognized successfully. Particularly, Zr-MOF: Eu 3+ has shown many appealing properties, such as high sensitivity, quick response (less than 1 min), broad response window (0–15 μM), and excellent selectivity. Most importantly, a kind of portable test paper based on Zr-MOF: Eu 3+ probe has been developed for directly assessing the level of BR in real human serum and further diagnosing bilirubin-related diseases via visually observing the luminescent color variation.
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PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 6
·3084-3091
·
IF 3.119
Caixue Lin,Hailu He,Yongqi Zhang,Mingyue Xu,Feng Tian,Ling Li,Yingxi Wang
In recent years, the construction of drug carriers that integrate diagnosis and treatment has become a new trend. In this article, a metal–organic framework (Zr-MOF) was synthesized and functionalized using acetaldehyde-modified-cystine (AMC) to form the functional drug carrier Zr-MOF/AMC which could be used to determine the concentration of glutathione (GSH) for cancer diagnosis, and to achieve pH/GSH dual-responsive release of methotrexate (MTX) for cancer therapy. The cleavage of the AMC disulfide bond by GSH generates two fluorescent molecules that produce strongly enhanced fluorescence, and the intensity is proportional to the GSH concentration. The green fluorescence of Zr-MOF/AMC in cancer cells proves that it can be applied in cell imaging to detect abnormal GSH concentrations for early diagnosis. In addition, MTX loaded on the Zr-MOF/AMC is released by the cleavage of the –S–S– and –CN– bonds at the high GSH concentration and low pH in cancer cells. This dual-responsive drug release helps to deliver drugs to cancer cells more precisely. All the experiments suggest that this novel type of pH/GSH dual-responsive Zr-MOF/AMC nanoparticle may serve as a new drug delivery system for cancer diagnosis and treatment.
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高影响因子
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