Frontiers of Materials Science
·
2025
·Vol. 19
·期 4
·250743
·
IF 2.3
Zhang Hang,Liu Shuhui,Zhang Xingxiang,Li Wei
A new method of incorporating nano-sized titanium dioxide (nano-TiO 2 ) particles onto the shell of photochromic microencapsulated phase change materials was introduced, in order to address issues of easy degradation of photochromic dyes’ core components caused by ultraviolet (UV) irradiation and residual organic emulsifiers. Using nano-TiO 2 as the Pickering emulsion stabilizer and cross-linked polyurethane as the shell material, a composite protective structure was constructed to encapsulate core materials with phase-change and photochromic properties, thereby forming photochromic phase change microcapsules (TPT-MPCMs) with UV protection and thermal insulation. Characterization results show that the core–shell structured TPT-MPCMs possessed high light transmittance, with a particle size of 5–15 µm and a latent heat of 116.2 J·g −1 . The highly cross-linked shell formed by xylitol and isophorone diisocyanate effectively protected the core from thermal degradation up to 180 °C, while the nano-TiO 2 shell surface allowed maintaining the UV responsiveness of microcapsules after exposure to intense UV irradiation for 5 h. This strategy significantly improves the long-term stability and service life of photochromic microcapsules under harsh environments, opening up broad prospects for their applications in fields such as outdoor anti-counterfeiting labels, intelligent temperature-controlled coatings, and multifunctional smart textiles.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 8
·7627-7638
·
IF 2.76
Zhu Nengwu,Cao Yanlan,Shi Chaohong,Wu Pingxiao,Ma Haiqin
Recovery of gold from aqueous solution using simple and economical methodologies is highly desirable. In this work, recovery of gold as gold nanoparticles (AuNPs) by Shewanella haliotis with sodium lactate as electron donor was explored. The results showed that the process was affected by the concentration of biomass, sodium lactate, and initial gold ions as well as pH value. Specifically, the presence of sodium lactate determines the formation of nanoparticles, biomass, and AuCl 4
− concentration mainly affected the size and dispersity of the products, reaction pH greatly affected the recovery efficiency, and morphology of the products in the recovery process. Under appropriate conditions (5.25 g/L biomass, 40 mM sodium lactate, 0.5 mM AuCl 4
− , and pH of 5), the recovery efficiency was almost 99 %, and the recovered AuNPs were mainly spherical with size range of 10–30 nm (~85 %). Meanwhile, Fourier transforms infrared spectroscopy and X-ray photoelectron spectroscopy demonstrated that carboxyl and amine groups might play an important role in the process. In addition, the catalytic activity of the AuNPs recovered under various conditions was testified by analyzing the reduction rate of p -nitrophenol by borohydride. The biorecovered AuNPs exhibited interesting size and shape-dependent catalytic activity, of which the spherical particle with smaller size showed the highest catalytic reduction activity with rate constant of 0.665 min −1 .
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2013
·Vol. 31
·期 12
·1613-1622
·
IF 1.27
Zhang Fei-jun,Liu Xiao-hui
Initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) of acrylonitrile was first conducted at various ambient temperatures (30–45 °C). The key to success is ascribed to the usage of an appropriate low temperature radical initiator (2,2′-azobis(2,4-dimethylvaleronitrile)) and a high reactivity catalytic system (CuBr 2 /Me 6 TREN). The molar ratio of Cu catalyst to AN as low as 1:20000 was used to prepare well-defined polyacrylonitrile with controlled molecular weight and a narrow polydispersity index range of 1.08–1.30, while the monomer conversion was up to ca . 98%. The apparent activation energy of the polymerization was calculated to be 128.45 kJ/mol, suggesting that the polymerization strongly depended on reaction temperature. The very high chain-end functionality of the resultant polymer was confirmed by 1 H-NMR and GPC analyses as well as chain extension reaction.
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Science China-Materials
·
2019
·Vol. 63
·期 6
·959-964
·
IF 5.636
Chen Fang,Li Tianbo,Pan Xiaoli,Guo Yalin,Han Bing,Liu Fei,Qiao Botao,Wang Aiqin,Zhang Tao
Heterogenization of the homogeneous catalysis has been studied for almost 50 years. Single-atom catalysis has the advantages of both homo- and heterogeneous catalysis. It has been proposed, and subsequently experimentally verified that single-atom catalysis is able to bridge homo- and heterogeneous catalysis, thus providing a new avenue to realize the heterogenization of homogeneous catalysis. Alkoxycarbonylation of aryl halides is an effective method for the direct synthesis of carboxylic acid derivatives, and is commonly catalyzed by Pd-based homogeneous complexes with N/P-containing ligands and organic/inorganic base. Herein, we firstly reported that Pd 1 /CeO 2 single-atom catalyst showed good performance in the alkoxycarbonylation of aryl iodides reaction. Under base-free and ligand-free conditions, Pd 1 /CeO 2 single-atom catalyst can transfer different aryl iodides to corresponding products. The catalyst can be easily recovered and reused four times without significant loss of reactivity.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2016
·Vol. 22
·期 3
·309-314
·
IF 1.87
Chen Le,Wang Yue-Wei,He Ming-Yang,Chen Qun,Zhang Zhi-Hui
5A zeolites were facilely synthesized from attapulgite clay and sodium aluminate precursors. The optimum synthesis condition for 4A zeolite (Na-form) were H 2 O/attapulgite ratio of 40:1 volume/mass, NaOH/attapulgite mass ratio of 2.35:1, the crystallization time was 4 h at 80–85 °C. The 4A zeolite was converted to related 5A zeolite (Ca-form) through ionic exchanges using calcium chloride solution with the Si/Al mole ratio of 1.3. SEM images demonstrated that as-synthesized 5A zeolites are ordered cubic crystals, average crystals length dimension is 1–2 μm. And the zeolites product had a specific surface area of 482 m 2 g −1 and total pore volume of 0.274 cm 3 g −1 . The static adsorption experiments showed that the equilibrium adsorption capacities of n -decane and n -pentadecane on produced 5A zeolite were 0.253 and 0.510 g g −1 , respectively. And the adsorption equilibrium time of n -decane and n -pentadecane on 5A zeolite were 45 and 60 min, respectively. The experimental adsorption data of n -decane and n -pentadecane on three zeolites could be properly fitted by the Langmuir–Freundlich isotherm model.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-6
·
IF 4.122
Chen Yingying,Lu Hang,Xiu Fei,Sun Tao,Ding Yamei,Liu Juqing,Huang Wei
Building transient electronics are promising and emerging strategy to alleviate the pollution issues from electronic waste (e-waste). Although a variety of transient devices comprising organic and inorganic materials have been described, transient light emitting devices are still elusive but highly desirable because of the huge amount of lighting and display related consumer electronics. Here we report a simple and efficient fabrication of large-area flexible transient alternating current electroluminescent (ACEL) device through a full-solution processing method. Using transparent flexible AgNW-polymer as both electrodes, the devices exhibit high flexibility and both ends side light emission, with the features of controlled size and patterned structure. By modulating the mass ratio of blue and yellow phosphors, the emission color is changed from white to blue. Impressively, the fabricated ACEL device can be thoroughly dissolved in water within 30 min. Our strategy combining such advances in transient light emitting devices with simple structure, widely used materials, full solution process, and high solubility will demonstrate great potential in resolving the e-waste from abandoned light-emitting products and expand the opportunities for air-stable flexible light emitting devices.
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Science China-Technological Sciences
·
2022
·Vol. 65
·期 8
·1772-1779
·
IF 3.903
Li Cong,Tan Dan,Luo Cheng,Luo JunHui,Cao Ke,Yang Li,Zhou YiChun
Toughness enhancement of zirconium tantalum ceramics is conducive to the new generation of thermal barrier coatings (TBCs). The phase transformation toughening mechanism of zirconium tantalum ceramics has been explored through the Vickers indentation of YTaO 4 ceramic block, the phase transformation region is found near the indentation and the microcrack tip. The increased energy of stable phase Δ E M−M′ >0, and the volume expanded Δ V ≈1.9%, so, the phase transformation is a process of energy absorption. The additional stress α a restraining the crack propagation was generated in the shielding area at the crack tip. In addition, combined with the toughening of ferroelastic domains switch, the traditional microcrack toughening, and crack propagation toughening, we summarized the toughening mechanism of YTaO 4 ceramics with the increasing external load, which is followed by ferroelastic toughening, phase transformation, microcrack, and crack propagation. For the perspective of toughening, we found that Z 4+ doping in YTaO 4 ceramics could broaden the phase transformation range in phase transformation toughening, significantly improve the toughness and reduce the generation of cracks in microcrack toughening and crack propagation toughening. Therefore, toughening mechanism of zirconium tantalum ceramics has important guiding significance for the service of TBCs.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 8
·2077-2085
·
IF 2.234
Liu Xiaoyan,Zhu Kunlei,Tian Jianhua,Tang Qiwei,Shan Zhongqiang
A yolk-shell sulfur/carbon (S/C) composite for the cathode of lithium–sulfur batteries was successfully prepared by an accessible method with tetrahydrofuran as solvent. The as-prepared composites are characterized by thermal gravimetric, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption and desorption. In this composite, sulfur particle is encapsulated in the carbon shell even entering into the micropores of carbon Bp2000. The electrochemical performance of the S/C composites is evaluated. The results indicate that the S/C composite with 50 wt% sulfur content shows good reversibility, excellent rate capability, and slow degradation. It delivers an initial capacity of 784.4 mAh g −1 (based on sulfur weight) and preserves at 598.3 mAh g −1 after 195 cycles at 1C. It achieves a high-capacity retention of 76.27 % from the 5th to 200th cycle, and as high as 91.19 % during the latter 150 cycles. The improvement is mainly attributed to the favorable structure of the S/C composite, in which the carbon cannot only facilitate transport of electrons and Li + ions but also trap polysulfides and retard the shuttle effect during charge/discharge process.
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International Journal of Machine Learning and Cybernetics
·
2024
·Vol. 15
·期 12
·5981-6010
·
IF 3.1
Zhang Jinlu,Wei Lixin,Guo Zeyin,Hu Ziyu,Che Haijun
Industrial applications and optimization problems in reality often involve multiple objectives. Due to the high dimensionality of objective space in many-objective optimization problems (MaOPs), the ability of traditional evolution operators to search the optimal region and generate promising offspring sharply decreases. Besides, as the number of objectives increases, it becomes difficult to balance the convergence and diversity of the population. Considering all these facts, this paper proposes a mutation individual position detection strategy. It estimates both individual fitness and diversity contributions, and assigns appropriate positions to individuals in the mutation operator through individual ranking. Then, by introducing an external population to adjust the weight vectors, its maintenance process takes into account the matching information between the population and the weight vectors. By comparing five representative algorithms, numerical experiments have shown that the algorithm can obtain a well distributed final solution set on optimization problems of various objective scales. Moreover, it also demonstrates advantages in generating excellent offspring individuals and balancing the overall performance of the population. In summary, the algorithm has competitiveness in solving MaOPs.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-19
·
IF 4.38
Gul Taza,Kashifullah,Bilal M.,Alghamdi Wajdi,Asjad M. Imran,Abdeljawad Thabet
The thermal management of the flow of the hybrid nanofluid within the conical gap between a cone and a disk is analyzed. Four different cases of flow are examined, including (1) stationary cone rotating disk (2) rotating cone stationary disk (3) rotating cone and disk in the same direction and (4) rotating cone and disk in the opposite directions. The magnetic field of strength \(B_{0}\) is added to the modeled problem that is applied along the z-direction. This work actually explores the role of the heat transfer, which performs in a plate-cone viscometer. A special type of hybrid nanoliquid containing copper Cu and magnetic ferrite Fe 3 O 4 nanoparticles are considered. The similarity transformations have been used to alter the modeled from partial differential equations (PDEs) to the ordinary differential equations (ODEs). The modeled problem is analytically treated with the Homotopy analysis method HAM and the numerical ND-solve method has been used for the comparison. The numerical outputs for the temperature gradient are tabulated against physical pertinent variables. In particular, it is concluded that increment in volume fraction of both nanoparticles \(\left( {\phi_{{Fe_{3} O_{4} }} ,\phi_{Cu} } \right)\) effectively enhanced the thermal transmission rate and velocity of base fluid. The desired cooling of disk-cone instruments can be gained for a rotating disk with a fixed cone, while the surface temperature remains constant.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 5
·4075-4079
·
IF 2.019
Wang Wei,Hao Lingyun,Zhang Wei,Lin Qing,Zhang Xiaojuan,Tang Zhengxia
In this paper, CuSbS 2 thin films were prepared by a facile and environmental-friendly chemical solution method at low temperature. The effect of sulfurization temperature was studied. The properties of CuSbS 2 thin films were investigated by X-ray diffraction, scanning electron microscopy, UV–Vis and photocurrent response measurement. The results indicated CuSbS 2 thin films sulfurized at 350 °C showed better crystallinity and no impurity phase. The as-prepared CuSbS 2 film had a band gap of 1.5 eV and an obvious photoconductivity.
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Frontiers of Materials Science
·
2026
·Vol. 20
·期 4
·260783
·
IF 2.3
Wang Siyu,Wang Yixin,Li Haojie,Zhao Kongyin,Kan Bohong
Hydrogel materials capable of loading and releasing functional proteins have attracted extensive attention. In this study, phycocyanin-loaded polyacrylamide/calcium alginate/calcium carbonate (PC@PAM/CaAlg/CaCO 3 ) composite hydrogel films were fabricated by combining a PAM/CaAlg polymer network with in-situ CaCO 3 mineralization. This mineralization strategy provided an additional structural approach for regulating film swelling and PC transport. The effects of the acrylamide/sodium alginate (AM/NaAlg) mass ratio and Na 2 CO 3 concentration on swelling and PC release in phosphate-buffered saline (PBS, pH 7.4) were investigated. The AM/NaAlg ratio of 4:1 resulted in relatively high swelling and PC release, whereas the PC diffusion was substantially restricted at 12:1. The film prepared at 8:1 and treated with 0.20 wt.% Na 2 CO 3 exhibited relatively high swelling and gradual, sustained PC release. This film showed antibacterial inhibition rates of 67.27% against S. aureus and 52.45% against E. coli , while ABTS and DPPH radical-scavenging efficiencies reached 98.29% and 79.68%, respectively.
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危险品化学品经营许可证（带存储）