APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhen-Kun He,Qiang Sun,Zhongning Shi,Kaiyu Xie,Ali Reza Kamali
Spiky polycrystalline SnO 2 balls assembled from pyramid-shaped SnO 2 nanocrystals with surface oxygen vacancies were synthesized by a simple and facile in-situ molten salt oxidation method using SnCl 2 as the tin source and graphite as the surface reductant. In this method, perfect SnO 2 nanocrystals are first formed on the surface of graphite particles at 500 °C. By increasing the processing temperature to 700 °C, the formation of surface oxygen vacancy defects was confirmed, supported by various characterisation methods including Raman and XPS spectroscopy. A sharp increase in the bulk electrical conductivity of the samples was detected by exceeding the onset temperature corresponding to the formation of oxygen deficient SnO 2 crystals, at which the conductivity of the sample significantly outperformed that of commercial SnO 2 nanoparticles. The formation of oxygen vacancies on SnO 2 crystals is thermodynamically studied, and suggested to occur by surface carbon reduction of the crystals at sufficiently high temperatures. The enhanced electrical conductivity of oxygen deficient SnO 2 crystals can lead to a wider application of tin oxides in advanced electrical applications.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 9
·1491-1497
·
IF 11.534
Liu Yi,Wang Chuangye,Luo Wei,Bai Liang,Xu Yang,Hao Xiaodong,Zhu Jianfeng,Guo Shouwu
The microstructure and morphology of Ti 3 AlC 2 powders not only affect the preparation of Ti 3 C 2 MXene but also have a great influence on their potential applications, such as microwave absorbers, alloy additives, or catalytic supports. However, the synthesis of Ti 3 AlC 2 powders with desired microstructure and morphology remains a challenge. Herein, hollow Ti 3 AlC 2 microrods were prepared for the first time in NaCl/KCl molten salts by using titanium, aluminum, and short carbon fibers as starting materials. It was found that the short carbon fibers not only performed as carbon source but also acted as sacrificial template. Furthermore, it was revealed that TiC and Ti 2 AlC were initially formed on the surface of carbon fibers. The subsequent reactions between the outer Ti, Al and the inner carbon were dominated by the Kirkendall effect which gave rise to the formation of a hollow structure. Based on this mechanism, hollow Ti 3 AlC 2 microspheres and a series of hollow TiC, Ti 2 AlC, and V 2 AlC powders were also successfully fabricated. This work provides a facile route to synthesize hollow MAX phases and may give enlightenment on preparing other hollow carbide powders via the Kirkendall effect in the molten salts.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 44
·7813-7820
·
IF 3.756
Chao Wu,Lu Gao,Jing Xiong,Xia-Lin Dai,Wei Gao,Tong-Bu Lu,Jia-Mei Chen
Rucaparib (RUC) is a potent poly (ADP-ribose) polymerase inhibitor for the treatment of advanced ovarian cancer and recurrent epithelial ovarian cancer. It is marketed in the form of its camsylate salt with a solubility of 1.4 nmol L−1 and absolute oral bioavailability of 36–37%. To expand the solid-state scope of RUC, three salts with fumaric acid (RUC/FA, 2 : 1), adipic acid (RUC/AA, 1 : 1) and pimelic acid (RUC/PA, 1 : 1) were synthesized and characterized. The crystal structure and infrared spectroscopy analyses demonstrate that proton transfer occurs between the RUC and FA/AA/PA molecules, confirming the formation of salts. In comparison with the commercial camsylate salt of RUC, RUC/AA and RUC/PA exhibit significantly enhanced solubility without sacrificing hygroscopicity and physical stability. Therefore, RUC/AA and RUC/PA may have the potential for developing improved formulations of RUC.
研究领域:
药学
·
化学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fang Zhang,Yuchen Cui,Jingxin Gao,Ziang Li,Yiping Yu,Yuxuan Xia,Wei Lei,Jie Zhang,Nuofu Chen,Jikun Chen
While perovskite cobaltites ( Re CoO 3 , Re : rare-earth) exhibit multiple spin states and complex electromagnetic phase diagram, their intrinsic metastability at heavy rare-earth composition ( Re H CoO 3 ) impedes their synthesis. Herein, we effectively synthesized Re H CoO 3 ( Re H = Ho, Er, and Tm), without the necessity to use the previous high pressures, by descending their reaction temperatures within molten-salts. Owing to the intermediate valence of Co 3 + , their metastable perovskites cannot be stabilized by simply elevating oxygen pressures, in contrast to the synthesis of high-transitional valence metastable perovskites such as Re NiO 3 . Alternatively, the positive formation free energy of the Re H CoO 3 was reduced by introducing KCl that dissolve the precursors at lower temperatures to prevent varying the valence of Co without scarifying the reaction kinetics. The effective synthesis of metastable Re CoO 3 towards heavy rare-earth composition further extends the range for regulating both the electronic and magnetic phases of Re H CoO 3 , paving the way to their potential electromagnetic applications.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 3
·671-677
·
IF 3.117
Sanzhao Song,Jian Sun,Jing Zhou,Chengzhi Guan,Zhiwei Hu,Ting-Shan Chan,Xian-Long Du,Xiao Lin,Jun Hu,Linjuan Zhang,Jian-Qiang Wang
Molten salts have been reported to be excellent media for the preparation of multicationic oxides, which require harsh conditions to crystallize. Molten salt synthesis provides a wider operational temperature range (usually extends to 1000 °C) and faster mass transport and nucleation processes, thus allowing the preparation of crystalline solids, which require higher temperatures, such as perovskites. However, the mechanisms that control the solid-state formation and phase selection are poorly understood. Herein, several typical molten alkali metal halide (Cl−) and oxosalt (CO32− and SO42−) systems were employed as the reaction media for the synthesis of LaCoO3 (LCO) crystals, and the effects of ionic salt species on the morphological, geometric and electronic structures of LCO crystals were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray absorption spectroscopy (XAS). The LCO perovskite was successfully synthesized in a molten NaCl–KCl eutectic mixture at 700 °C, which was lower than that used for the conventional mixed oxide synthesis. Our results show that in the molten salt synthesis, the type of reaction medium, calcination temperature, the ratio of salt, and reaction time govern the microscopic mechanisms in the preparation of multicationic oxides. Most importantly, we observed that LaOCl was formed as an intermediate, which plays a key role in the reaction pathway for the phase-selective synthesis of perovskite LCO.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wenzhong Zou,Guoyun Zhou,Yan Hong,Wei He,Shouxu Wang,Yuanming Chen,Chong Wang,Yao Tang,Yukai Sun,Chaoying Ma
In this work, the high-yield synthesis of BaTi 2 O 5 (BT2) nanorods with a growth direction at [020] was achieved in the medium of KCl salt through the molten-salt synthesis (MSS) with Ba(NO 3 ) 2 and anatase TiO 2 as reactants. By optimizing the involved reaction factors including particle sizes, thermal holding durations and crystalline forms of TiO 2 , ultra-pure BT2 nanorods with uniform size were obtained after 45 min of heating at 950 °C. Meanwhile, anatase and rutile TiO 2 were respectively mixed and calcined in KCl to study the formation and transformation process of BT2 nanorods in detail. It was found that anatase TiO 2 tends to merge together and convert into rutile TiO 2 . In particular, the formed rutile TiO 2 reacts with BaO and BaTiO 3 to spontaneously form BT2 nanorods without any presence of rod-like templates. Besides, BT2 takes priority over K 2 Ti 6 O 13 to generate the corresponding nanorods in the molten salt with high content of K + . In addition, the O 2 in air also promotes the formation of nanorods. According to the experimental results, a probable mechanism for the initial formation, subsequent growth and transformation of BT2 nanorods was thus proposed, which helps to facilitate the preparation of BT2-based one-dimensional nanomaterials.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 1
·151-158
·
IF 1.563
Liu Chenglu,Wang Fang,Jia Peiyun,Lin Jun,Zhou Zhiqiang
Eu3+ and Dy3+-doped YVO4 nanocrystallites were successfully prepared at 400 °C in equal moles of NaNO3 and KNO3 molten salts. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electronic
microscopy (TEM), photoluminescence (PL) spectrum and lifetime were used to characterize the nanocrystallites. XRD results demonstrate that NaOH concentration and annealing temperature play important roles in phase purity and crystallinity of the nanocrystallites, the optimum NaOH concentration
and annealing temperature being 6:40 and 400 °C respectively. TEM micrographs show the nanocrystallites are well crystallized with a cubic morphology in an average grain size of about 18 nm. Upon excitation of the vanadate group at 314 nm, YVO4:Eu3+ and YVO4:Dy3+
nanocrystallites exhibit the characteristic emission of Eu3+ and Dy3+, which indicates that there is an energy transfer from the vanadate group to the rare earth ions. Moreover, the structure and luminescent properties of the nanocrystallites were compared with their
bulk counter-parts with same composition in detail.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Yingfeng Wu,Zhendong Luo,Yifan Yang,Jianhan Wu,Xiuquan Jia,Feng Wang
Nitrate synthesis is an important process for agriculture and industry, but suffers from energy-intensive steps including the synthesis and subsequent oxidation of ammonia. Herein, we present a selective N 2 transformation to nitrate by guiding the charge neutralization of self-electrified water microdroplets in an artificial cloud generated with the portable ultrasonic atomizer. The electron and ion transfer in the charge neutralization of water microdroplets on metal micromesh enables an up to ∼40-fold increase in the reactivity of nitrate formation reaction driven by ultrasonic energy. A robust semi-continuous N 2 oxidation by a Ni-mesh-screened cloud system was achieved, providing nitrate with ∼12 mM concentration every 20 h. These findings emphasize the potential of harnessing the microdroplet-mediated cloud electrochemistry of N 2 in decentralizing the current mass production of fertilizer.
研究领域:
化学
·
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Futures
·
2022
·Vol. 1
·期 4
·045102
·
IF 0
Ruijia Liu,Na Li,Enyue Zhao,Jinkui Zhao,Lingxu Yang,Wenjun Wang,Huijun Liu,Chaoliu Zeng
Transition metal nitrides (TMNs), including titanium nitride (TiN), exhibit remarkable application prospects as anodes for durable high-rate lithium-ion batteries (LIBs). Regrettably, the absence of simple synthesis methods restricts their further development. Herein, a facile and low-cost molten salt synthesis strategy was proposed to prepare carbon-anchored TiN nanoparticles as an advanced anode material for LIBs with high rate capabilities. This nanosized TiN obtained is ∼5 nm in size and well-distributed onto carbon plates, which could release a reversible capacity of ∼381.5 mAh g−1 at 0.1 A g−1 after 250 cycles and ∼141.5 mAh g−1 at 1.0 A g−1 after 1000 cycles. Furthermore, it was confirmed that the conversion reaction between TiN and Li-ions happened during the electrochemical reaction process, resulting in the formation of Li3N and Ti. This unique microstructure attributed from TiN nanoparticles anchored by carbon could support the structural volume during cycling. This work highlights the method superiority of TiN prepared via a molten salt synthesis strategy as an anode for LIBs with impressive rate performances.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
JOURNAL OF RARE EARTHS
·
2012
·
IF 0.901
Fang WANG,Chenglu LIU,Zhiqiang ZHOU,Peiyun JIA,Jun LIN
YVO 4 :Eu nanocrystalline phosphors were successfully prepared at 400 °C in equal moles of NaNO 3 and KNO 3 molten salts. NaOH concentration and annealing temperature played important roles in phase purity and crystallinity of the nanocrystallines, and the optimum NaOH concentration and annealing temperature were 6:40 and 400 °C, respectively. The nanocrystallines were well crystallized with a cubic morphology in an average grain size of 18 nm. Upon excitation of the vanadate groups at 314 nm, YVO 4 :Eu nanocrystallines exhibited the characteristic emission of Eu 3+ , which indicated that there was an energy transfer from vanadate groups to Eu 3+ . Moreover, the influence of superficial effect, especially the dangling bonds on the structure and luminescent properties of the nanocrystallines was discussed in detail.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Chemistry Letters
·
2022
·Vol. 20
·期 4
·2253-2259
·
IF 13.615
Shi En,Wang Xinyu,Zhang Miao,Wang Xin,Gao Jianchun,Zheng Yunbin
Wastewater treatment generates increasing amounts of unwanted sewage sludges, calling for advanced recycling methods. Here, we transformed sewage sludge into activated carbon by molten salt synthesis with ZnCl 2 . We analyzed the structure and specific surface area of sludge-derived activated carbon by Fourier transform infrared spectroscopy and Brunauer–Emmett–Teller analysis. Results show that the mass ratio of ZnCl 2 to sludge had a significant effect on the textural properties and adsorption performance of sludge-derived activated carbon. The maximum specific surface area was 549.72 m 2 /g, and the carbon utilization potential was 178.56 mg (C atom) /g (sludge) , for a mass ratio of ZnCl 2 to sludge of the total carbon mass in sludge-derived activated carbon adsorbed CO 2 and methylene blue can be achieved to 186.68 and 203.18 mg (C atom) /g (sludge) , respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
·
2024
·
IF 4.4
Lixin Liu,Yuning Wang,Jiuyi Sun,Yunan Zhang,Xiangyu Zhang,Lili Wu,Yingli Liu,Xuan Zhang,Yidi Xia,Qiumei Zhang,Ning Gao
To improve the solubility of the fluoroquinolone drug fleroxacin (FL), based on the previous experience of our research group in synthesizing co-crystals/salts of quinolone drugs to improve the physicochemical properties of drugs, Fleroxacin-D-tartaric acid dihydrate salt (FL-D-TT, C 17 H 19 F 3 N 3 O 3 ·C 4 H 5 O 6 ·2(H 2 O)), was synthesized for the first time using fleroxacin and D/L-tartaric acid (D/L-TT). Structural characterization of FL-D-TT was carried out using single-crystal X-ray diffraction, infrared spectral analysis (FT-IR) and powder X-ray diffraction (PXRD). Molecular electrostatic potential analysis showed that D-tartaric acid interacted more readily with FL than L-tartaric acid. The solubility of FL-D-TT (9.71 mg/mL, 1.82 mg/mL) was significantly higher compared to FL (0.39 mg/mL, 0.71 mg/mL) in water and buffer solution at pH 7.4. This may be attributed to the formation of charge-assisted hydrogen bonds (CAHBs) between FL and D-TT that facilitates the dissociation of FL cations in the dissolution medium, leading to an increase in FL solubility. This also led to some improvement in the in vitro antimicrobial activity of FL-D-TT against E. coli , S. typhi , and S. aureus. In addition, the hygroscopic stability of FL has been improved. Surprisingly, FL-D-TT had better photostability than FL, which could be attributed to the introduction of D-TT to make the photosensitizing moiety of FL more stable, which led to the improvement of the photostability of FL.
研究领域:
药物化学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）