JOM
·
2022
·Vol. 74
·期 7
·2742-2749
·
IF 2.597
Zhang Rui-Hua,Hao Zhen-Hua,Shi Lin-Yuan,Chen Hao-Tian,Shu Yong-Chun,He Ji-Lin
In this present study, carbothermic reduction process of MoO 3 to produce MoO 2 has been carried to investigate the influences of reaction temperature and distance between activated carbon and MoO 3 on phase composition of reduction products by controlling carbon diffusion. Results show that the reduction degree increases with the increase of temperature and the decrease of distance between activated carbon and MoO 3 . MoO 3 can be completely reduced to MoO 2 at 680°C with the carbon distance of 1 mm. It is found that the transformation from MoO 3 to MoO 2 is a process of crystal cracking and growth by observing the phase transition and morphological evolution during the reduction. The massive MoO 3 is first decomposed into a platelet-shaped MoO x (2.75 < x < 3), then the platelet-shaped MoO x changes into a needle-like shape or irregular platelet-like Mo 4 O 11 , and finally Mo 4 O 11 changes into irregular granular or irregular platelet-like shaped crystals, which form MoO 2 powders.
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RARE METALS
·
2022
·Vol. 41
·期 8
·2745-2758
·
IF 6.318
Li Pu-Bo,Wang Yong-Xun,Shao Ze-Xi,Wu Bin-Tao,Li Heng,Gao Mang-Mang,Liu Kuan-Guan,Shi Ke-Ren
The Mg–Al layered double hydroxide (LDH) conversion coatings were first synthesized in situ to modify the AZ91D alloy through urea hydrolysis to adjust the pH values (9.4, 10.4, 11.2 and 11.4). The pH 11.2 Mg–Al LDH possessed the best compactness and good crystallinity compared to other in situ LDH coatings and obtained the lowest corrosion current density ( i corr ) of (2.884 × 10 −6 ± 0.345 × 10 −6 ) A·cm −2 , which was attributed to the anion-exchange reaction of LDH and the physical barrier against corrosion owing to the twisted penetration pathway of the interlaced LDH sheets. Core–shell structured Zn–Al LDH@ZIF-8 powder modified with stearic acid (SA) was further wrapped with polyvinylidene fluoride (PVDF) to prepare a hydrophobic double-layered coating on the underlying pH 11.2 Mg–Al LDH (SLLZ). The water contact angle (CA) of the SLLZ coating reached 105.6°, and its i corr decreased to (3.524 × 10 −7 ± 0.214 × 10 −7 ) A·cm −2 compared with a single pH 11.2 film. The SLLZ coating exhibited high durability and corrosion protection, even after 15 days of immersion in NaCl solution. The PVDF, SA and ZIF-8 nano-shells contributed to good hydrophobicity, effectively forming a physical barrier. The Zn–Al LDH core and underlying in situ Mg–Al LDH were beneficial for synergistically promoting anion-exchange reaction between the intercalated anions of LDH and chlorides in corrosive media. This work provides a promising approach that combines core–shell LDH@ZIF-8 with LDH film on a Mg alloy surface to construct a hydrophobic film with excellent long-term anti-corrosion performance. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 20
·9187-9201
·
IF 4.682
Pan Hongwei,Wang Zhaokun,Wei Zhaoyang,Zhang Jiaping,Xu Minghan,Zong Chengzhong,Cao Lan,Wang Qingfu
In this study, a TPU/CNTs–ILs flexible sensor with a sandwich structure is prepared by a combination of coating and 3D printing method. First, to promote the dispersion of carbon nanotubes (CNTs), 1-butyl-3-methylimidazole tetrafluoroborate ionic liquids (ILs) are used as modifier. Two layers of thermoplastic polyurethane elastomer (TPU) filaments are printed on the bottom plate via 3D printing and coated with a layer of CNTs–ILs as a conductive layer. Finally, two layers of TPU are printed to encapsulate the conductive layer. It is revealed that the printed TPU/CNTs–ILs flexible sensor exhibited a sensitive resistance response at small and large strains (GF value of 20 and 440 at strains of 5% and 50%, respectively) while retaining high mechanical strength (tensile strength of more than 30 MPa and 600% elongation at break). In addition, the fabricated flexible sensor still displayed good resistance response after being cyclically stretched in the range of 0–50% strain for more than 400 s. Comparing the signal response of different vocal cord vibration frequencies and loudness, it is shown that the flexible device with high sensitivity in sensing can monitor human motion behavior, indicating the TPU/CNTs–ILs flexible sensor with a sandwich structure has excellent application prospects as wearable electronic components. Graphical abstract
Scheme 1. The graphic abstract of the whole experimental process
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JOURNAL OF NANOBIOTECHNOLOGY
·
2022
·Vol. 20
·期 1
·1-22
·
IF 9.429
Li Rong-Tian,Zhu Yi-Dan,Li Wen-Ya,Hou Ying-Ke,Zou Yi-Ming,Zhao Ying-Hua,Zou Quan,Zhang Wen-Hua,Chen Jin-Xiang
A multifunctional nanoplatform with core–shell structure was constructed in one-pot for the synergistic photothermal, photodynamic, and chemotherapy against breast cancer. In the presence of gambogic acid (GA) as the heat-shock protein 90 (HSP90) inhibitor and the gold nanostars (AuNS) as the photothermal reagent, the assembly of Zr4+ with tetrakis (4-carboxyphenyl) porphyrin (TCPP) gave rise to the nanocomposite AuNS@ZrTCPP-GA (AZG), which in turn, further coated with PEGylated liposome (LP) to enhance the stability and biocompatibility, and consequently the antitumor effect of the particle. Upon cellular uptake, the nanoscale metal − organic framework (NMOF) of ZrTCPP in the resulted AuNS@ZrTCPP-GA@LP (AZGL) could be slowly degraded in the weak acidic tumor microenvironment to release AuNS, Zr4+, TCPP, and GA to exert the synergistic treatment of tumors via the combination of AuNS-mediated mild photothermal therapy (PTT) and TCPP-mediated photodynamic therapy (PDT). The introduction of GA serves to reduce the thermal resistance of the cell to re-sensitize PTT and the constructed nanoplatform demonstrated remarkable anti-tumor activity in vitro and in vivo. Our work highlights a facile strategy to prepare a pH-dissociable nanoplatform for the effective synergistic treatment of breast cancer.Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 17
·14097-14107
·
IF 2.779
Ba Ruiqing,Ma Weibing,Hong Jingnan,He Xinghui,Li Jing,Yang Sen
This paper reports investigation on fabrication and densification of cerium hexaboride (CeB 6 ). CeB 6 powders were successfully synthesized from cerium oxide and boron carbide at 1500 °C in a vacuum. X-ray diffraction and XPS spectra were applied to detect and trace the variation of reactant during the general reaction, where CeO 2 consequently transformed into CeB 6 after the intermediate states such as Ce 2 O 3 and CeBO 3 . The whole process could be described as topo chemistry synthesis. The final state of cerium in CeB 6 contains Ce 3+ and Ce 4+ according to the peak split result of Ce 3d orbits. CeB 6 polycrystalline bulks of 98% relative density were prepared via hot pressing at 1900 °C under 40 MPa. The hardness and electrical resistivity of the dense CeB 6 reached 21.58 GPa and 4.6 × 10 − 5 Ω m, respectively.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 2
·360-366
·
IF 2.606
Chen Jinglei,Xie Guangmin,Chen Pengfei,Shi Zhiming,Ma Jiachen,Zhang Xiurong,Zhang Xihui,Wang Yige
Transparent materials with a low refraction index are used to eliminate an important energy loss in photovoltaic conversion which is caused by the Frensenl reflection at the air-substrate interface of a solar cell. Herein, we prepared the silica antireflection coating (AR) with low index by an acid-base-catalyzed sol-gel approach. The application of the AR coating can efficiently reduce the light reflection and which exhibits a maximum transmittance of T max = 99.4% at visible wavelengths from 380 nm to 800 nm. When the AR coating was applied to the silicon modules, leading to a significant efficiency enhancement from 16.18% to 16.83%. In addition, the AR coatings feature good adhesion and exhibit satisfactory mechanical stability under outdoor conditions. These results indicate a significant development for AR coatings applied in silicon modules as well as present a promising alternative to reduce the cost of energy.
The AR film prepared in this paper has both high transmittance and abrasion resistance. The current density of solar modules has been significantly improved, and the photoelectric conversion efficiency has increased by 4%.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3896-3902
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IF 2.047
Cheng Jiawen,Qing Zhenjun,Wang Jin,Zhao Yun,Zhou Xin,Zou Huapeng,Li Haiyan,Li Yingxiang
In this paper, the traditional solid-phase reaction sintering process was used to synthesize Ca 1-x Mg x V 2 O 6 (x = 0.03, 0.06, 0.09, 0.12) ceramics under low-temperature conditions. The effects of partial replacement of Ca 2+ by Mg 2+ on the A-site on the crystalline type, sintering temperature, microstructure, densification, and microwave dielectric performances of Ca 1-x Mg x V 2 O 6 ceramic were studied. The only crystalline phase of CaV 2 O 6 was observed in the ceramics. The sintering densification and dielectric performances of the Ca 1-x Mg x V 2 O 6 ceramic show a trend of first increasing and then decreasing with the increase of Mg 2+ content. The addition of Mg ions can effectively increase the Q × f value of the Ca 1-x Mg x V 2 O 6 ceramics but cannot improve the τ f value. The Ca 0.91 Mg 0.09 V 2 O 6 ceramic sintered at 725°C displayed good microwave dielectric performances: ε r = 10.41, Q × f = 68524 GHz, and τ f = − 36.8 ppm/°C. The good dielectric properties of this ceramic can meet the development needs of 5G communication technologies.
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POLYMER BULLETIN
·
2022
·Vol. 80
·期 3
·2503-2514
·
IF 2.843
Meng Chihan,Liu Xiucai
In this paper, the polycondensation kinetics of bio-based semi-aromatic high-temperature polyamide PA5T/56 was studied in a micro-high-temperature and high-pressure reactor. The polycondensation experiment of PA5T/56 salt solution with temperature of 240–300 ℃ and initial water content of 5–30wt% was carried out. The change of end group content in the reaction process was investigated, and the relationship between polymer equilibrium molecular weight and temperature and water content was explored. The results showed that the end group concentration decreased rapidly at the beginning of the reaction and approached equilibrium after a period of time, and the higher the temperature, the higher the initial water content and the lower the equilibrium molecular weight, indicating that the polycondensation of PA5T/56 was an exothermic reaction; on this basis, a kinetics model of polycondensation reaction was established based on the literature model, it was considered that the polycondensation reaction is an acid-catalyzed third-order reaction, and the effects of temperature and water content on the equilibrium and rate of polycondensation reaction can be investigated. The kinetics model of polycondensation reaction was obtained, and the calculated results of the model were basically consistent with the experimental values.
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Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-10
·
IF 20.257
Tao Songyuan,Zhou Changjiang,Kang Chunyuan,Zhu Shoujun,Feng Tanglue,Zhang Shi-Tong,Ding Zeyang,Zheng Chengyu,Xia Chunlei,Yang Bai
Revealing the photoluminescence (PL) origin and mechanism is a most vital but challenging topic of carbon dots. Herein, confined-domain crosslink-enhanced emission (CEE) effect was first studied by a well-designed model system of carbonized polymer dots (CPDs), serving as an important supplement to CEE in the aspect of spatial interactions. The “addition-condensation polymerization” strategy was adopted to construct CPDs with substituents exerting different degrees of steric hindrance. The effect of confined-domain CEE on the structure and luminescence properties of CPDs have been systematically investigated by combining characterizations and theoretical calculations. Such tunable spatial interactions dominated the coupling strength of the luminophores in one particle, and eventually resulted in the modulated PL properties of CPDs. These findings provide insights into the structural advantages and the PL mechanism of CPDs, which are of general significance to the further development of CPDs with tailored properties.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 10
·8292-8304
·
IF 2.779
Song Xiaodong,Yan Luting,Dai Chunai,Hao Changshi,Guo Hao,Xie Mingming,Zhang Yaru
Complementary devices with double-hybrid electrodes are prepared, assembled, and studied to improve the performance of complementary devices and take advantage of the excellent performance of composite electrochromic films. WO 3 films are prepared through the seed-assisted hydrothermal method, and polyaniline (PANI) is coated on WO 3 via electrochemical deposition. The electrochemical and electrochromic properties of the WO 3 /PANI composite films are better than those of WO 3 films. The improvement in the electrochromic properties of the WO 3 /PANI composite films is mainly due to PANI’s modification of the surface morphology of the WO 3 films and its excellent conductivity. Then, a complementary device with a double-hybrid electrode is assembled. The WO 3 /PANI and NiO/PB electrode films are used as the cathode and anode of the device, respectively, and KCl solution is employed as the electrolyte. The light modulation range of the complementary device is 55.71%, the coloring time is t c = 3.2 s, the bleached time is t b = 8.1 s, and the coloring efficiency is 24.63 cm 2 ·C −1 . All of these values are better than those of the single WO 3 and NiO devices. The electrode reaction process of the complementary device is synchronous and synergetic. Thus, the device exhibits good electrochromic performance.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 32
·49267-49278
·
IF 5.19
Peng Huan,Chen Rong,Tao Ningyao,Xiao Yangyi,Li Chenxing,Zhang Tuqiao,Ye Miaomiao
Activation of peroxymonosulfate (PMS) by Fe 2+ is a green oxidation process for degradation of organic contaminants. However, the formation of iron mud and low PMS utilization lead to the decreased oxidation efficiency. In this work, commercial MoS 2 particles were used as the catalyst for boosting the Fe 2+ /PMS process for carbamazepine (CBZ) removal. The CBZ removal efficiency by the MoS 2 /Fe 2+ /PMS process was significantly enhanced, increasing to 6.5 times that of the Fe 2+ /PMS process. The Fe 3+ was reduced to Fe 2+ by the exposed Mo 4+ on the surface of MoS 2 , leading to the enhanced PMS utilization rate and increased Fe 2+ concentration. The relative intensity of DMPO-HO• and DMPO- SO 4 – • followed the order of MoS 2 /PMS < Fe 2+ /PMS < MoS 2 /Fe 2+ /PMS, also suggesting the enhanced oxidation activity with the addition of MoS 2 in the process of Fe 2+ /PMS. The commercial MoS 2 had good stability shown by the CBZ removal efficiency remaining almost unchanged during 8-time cycling use. Finally, a possible CBZ degradation pathway was proposed for helping understand the oxidation mechanism of the MoS 2 /Fe 2+ /PMS process.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-11
·
IF 6.408
Jia Shicong,Tang Ruizhi,Zhang Shuai,Gao Zheng,Gong Bolin,Ma Shujuan,Ou Junjie
A kind of core–shell composite microsphere (CM) with nano-on-micro structure was synthesized via grafting amine-modified nanodiamonds onto the surface of monodisperse nonporous polymeric microsphere. In this way, the agglomeration of nanodiamond particles in the solution was avoided. After modification with pyrogallol groups, CM could chelate titanium ions (Ti 4+ ) and thus be utilized as immobilized metal affinity chromatography (IMAC) sorbent to enrich phosphopeptides from biological samples. The resulting Ti 4+ -CM exhibited high enrichment efficiency and specificity to phosphopeptides. A total of 106 of unique phosphopeptides mapped to 29 phosphoproteins were clearly identified from 5 µL of a milk digest after enrichment. Owing to the strong chelation between Ti 4+ and pyrogallol ligands, the Ti 4+ is not released from the sorbent after completion of the enrichment process. As a result, the Ti 4+ -CM sorbent could be reused, and no significant loss of enrichment efficiency occurred even on the fourth run employing a β-casein digest as the sample. The strategy adopted presents a new way to prepare a high-performance reusable IMAC sorbent. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）