JOURNAL OF THE KOREAN PHYSICAL SOCIETY
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2021
·Vol. 78
·期 9
·796-802
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IF 0.649
Wang Yunfeng,Chen Jun,Wei Xiaoyu,Cui Shaobo,Jia Xiao
Rare-earth-doped upconverison luminescent (UCL) materials have wide application prospects in the field of nanoptoelectronics technology. However, achieving highly efficient UCL materials is still a big challenge due to the serious nonradiative energy loss in the host materials. In this research, Gd 2 (WO 4 ) 3 : Yb 3+ , Er 3+ inverse opal photonic crystals (IOPCs) were prepared using a polymethylmethacrylate (PMMA) template-assisted method, and the effects of modulations of the IOPC structure on UC emission properties of Er 3+ were investigated systemically. As a result, the emission intensity of 2 H 11/2 - 4 I 15/2 in IOPC was found to be suppressed 37.4%, and the radiative lifetimes of 4 S 3/2 - 4 I 15/2 were prolonged 1.55 times. The effects of the doping concentration on the reciprocal of fluorescence lifetimes of 4 S 3/2 - 4 I 15/2 between the IOPC and the reference (REF) samples showed that the cross-energy transfer (CET) rate and the electronic transition rate were greatly inhibited, which could be due to the effect of the modulation of the effective index on the radiative transition rate and on the decrease of nonradiative transition rate caused by periodic thin-walled structure of IOPC. The power-dependent UC emission properties validated the supposition that the IOPC structure could be effectively suppressed the local thermal effect and thermal quenching. This research presents a further step in the exploration of the new kind of UCL materials with high luminous efficiency.
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RSC Advances
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2021
·Vol. 11
·期 30
·18432-18439
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IF 3.361
Ying Li,Jun Qian,Di Zhao,Rong Song
Here, we propose a method for preparing red perovskite CsPb(BrxI1−x)3 quantum dots (QDs) at room temperature. The PL emission peak of the QDs is close to 650 nm, and the full width at half maximum reaches 61 nm. The red CsPb(BrxI1−x)3 QDs with higher water stability are obtained successfully at room temperature by adjusting the proportion of halogen elements and incorporating polystyrene. At the same time, the red QDs are combined with a blue light-emitting diode to prepare a white light-emitting device (WLED). Compared with the WLED based on the Ce-doped Yttrium Aluminum Garnet (YAG:Ce) phosphor alone, the new WLED based on QDs exhibits a reduced correlated color temperature of 2976 K, while achieving a lumen efficiency of 55.3 lm W−1, which provides a feasible solution for future research on light-emitting diodes (LEDs).
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Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Jian Yu,Zhongni Zhang,Rui Guo,Wenan Peng,Hongye Yang,Cui Huang
Current adhesive techniques allow clinicians to bond composite resin to dentin for esthetic restoration of defected tooth. However, a vulnerable adhesive-dentin interface remains clinically challenging resulting in frequent replacement of the restorations. The inappropriate management of exposed dentin plays a major role in jeopardizing the bond stability of the adhesive-dentin interface. To overcome this problem, this paper highlights an epigallocatechin-3-gallate/nanohydroxyapatite (EGCG/nHAp) platform (mesoporous silica-based) delivery approach to the adhesive-dentin interface and investigates its effectiveness on dentin bonding durability. Microtensile bond strength, interfacial nanoleakage, and in situ zymography were determined. The inhibition of Streptococcus mutans ( S. mutans ) biofilm formation along the adhesive-dentin interface was assessed by confocal-laser scanning microscopy, colony forming units counts, and field-emission scanning electron microscopy. Results revealed that applying the EGCG/nHAp delivery platform on exposed dentin could preserve the dentin bond strength and reduce interfacial nanoleakage after collagenase ageing; moreover, it could inactivate the activity of matrix metalloproteinase within the hybrid layer and inhibit the adhesion and biofilm formation of S. mutans . The proposed approach demonstrates great potential for stabilizing the adhesive-dentin interface to improve dentin bonding durability and prevent secondary caries progression, thereby indicating a promising strategy to prolong the service life of dental restorations.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 25
·期 2
·527-534
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IF 2.646
Yan Binggong,Kang Lei,Kotobuki Masashi,He Linchun,Liu Bin,Jiang Kaiyong
We report effectiveness of dopants selected from group 13, such as B, Ga, and In, on the conductivity of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) that is recognized as one of the promising solid electrolytes for next-generation solid-state lithium batteries. To minimize loss of versatile element, crystallization of LAGP using a microwave irradiation is introduced. Experimental results demonstrate that B enhances grain boundary conductivity, while Ga improves the bulk ionic conductivity. Co-doping of B and Ga leads to enhanced total ionic conductivity and remarkably reduced activation energy.
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POLYMER BULLETIN
·
2020
·Vol. 78
·期 7
·3785-3801
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IF 2.014
Ma Yu,Wang Lulu,Feng Ruijiang,Wang Jilin,Cai Tianzhou
In this study, we prepared a novel composite membrane (QCS-IRMOF-3) by attaching IRMOF-3 (metal–organic framework materials, formed by coordination of metallic zinc and 2-aminoterephthalic acid) with a free amino group to a quaternized chitosan (QCS) by chemical cross-linking. The successful synthesis of IRMOF-3 was verified by SEM, XRD, and FT-IR. Then, the mechanical properties, swelling properties, ion exchange capacity, hydroxide conductivity and chemical stability of the composite membrane (QCS-IRMOF-3) were also investigated. It was found that the performance of the aforementioned composite membrane was affected obviously by the amount of IRMOF-3 crystals. The composite membrane doped with 15 wt% IRMOF-3 crystals exhibits better overall performance, which included that the tensile strength is 22.4 MPa, water uptake is 78.4%, hydroxide conductivity is 29.9 mS cm −1 at 80 °C, and after immersion in 6.0 mol L −1 KOH solutions at 60 °C for about 240 h, only the conductivity decreased by less than 10%. This result implies that the composite membrane synthesized in this research is promising for application in alkaline polymer electrolyte fuel cells.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215605
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IF 3.551
Yu-Wei Liu,Shao-Hong Guo,Si-Qi You,Chun-Yi Sun,Xin-Long Wang,Liang Zhao,Zhong-Min Su
Halide perovskites have been employed as photocatalysts for CO2 photoreduction due to their excellent optical properties and unique electronic structure. However, their photocatalytic performance is relatively poor. Herein, we demonstrate a new strategy with Mn-doped CsPb(Br/Cl)3 mixed-halide perovskites as catalysts to enhance the efficiency of CO2 photoreduction. By tuning the content of Mn, a series of CsPb(Br/Cl)3:Mn perovskites are obtained and show high efficiency in CO2 conversion to CO and CH4. For the optimum catalyst sample, especially, the yields of CO and CH4 reach 1917 μmol g−1 and 82 μmol g−1 which are 14.2 and 1.4 times higher than those of CsPbBr3. This work provides new insights into improving the reactivity of perovskites in CO2 photoreduction.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2020
·期 10
·854-858
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IF 2.529
Yaoguo Shen,Xiaoling Xue,Wenyuan Tu,Zhiqun Liu,Renwen Yan,Hong Zhang,Junrong Jia
Graphical An ultraviolet-transparent sulfate Cs 2 Ca 2 (SO 4 ) 3 has been synthesized. It exhibits a moderate second harmonic generation efficiency and has good thermal stability higher than those of most nonlinear optical sulfates reported recently. The noncentrosymmetric structure is one prerequisite of a nonlinear optical (NLO) material. Here, a sulfate Cs 2 Ca 2 (SO 4 ) 3 with a noncentrosymmetric structure was synthesized by high-temperature solid-state reaction, and its crystals were grown by spontaneous crystallization. Single-crystal X-ray diffraction indicates that Cs 2 Ca 2 (SO 4 ) 3 features a three-dimensional framework constituted by corner-sharing CaO 6 octahedra and SO 4 tetrahedra. Optical characterizations suggest that Cs 2 Ca 2 (SO 4 ) 3 is transparent down to 200 nm and exhibits a moderate second-order NLO response of about 0.6 × KH 2 PO 4 . Electronic band structure calculations were performed to elucidate the optical origin. Furthermore, the title compound has good thermal stability of up to about 1000 K, which is greatly higher than those of NLO sulfates reported recently. This work may shed useful light on the development of new NLO sulfates with high thermal stability.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Dacheng Yang,Yanhong Ran,Xusheng Li,Xinwei Jiang,Jiali Chen,Jianxia Sun,Lingmin Tian,Katia Teerds,Weibin Bai
Cadmium (Cd) is an environmental pollutant and endocrine disrupter , abundantly present in water, food, and soil. Accumulation of Cd in the body can negatively affect female reproduction; especially the uterus is exceptionally sensitive to the toxic actions of Cd. The anthocyanin cyanidin-3- O -glucoside (C3G) is a naturally occurring phenolic compound in fruits and plants that can antagonize the toxic effects of Cd. This capacity makes C3G a possible candidate to prevent Cd-induced female infertility. The present study aimed to investigate: 1) whether C3G intake could prevent Cd-induced female reproductive toxicity, and 2) the underlying mechanisms responsible for this protective effect. The results of our study indicated that Cd exposure did not affect ovarian function, but induced hypertrophy of the uterine endometrium. Oral intake of C3G markedly reduced the effects of Cd exposure on the thickness of the uterine epithelium cells. Transcriptomic analysis of the endometrium revealed that C3G intake had anti-estrogenic effects, attenuating Cd-induced endometrial epithelial cell proliferation by inhibiting estrogen-responsive genes, enhancing epithelial progesterone receptor expression, and regulating Klf4 expression. The current findings implicate that C3G has the potential to be used as a dietary supplement based on its capacity to intervene in Cd-induced female reproductive toxicity.
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SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Maolu Wang,Xinjian Wang,Junyan Liu,Jiacheng Wei,Zhangwen Shen,Yang Wang
Surface texturing is an effective way for friction-reduction in hydrodynamic lubricating conditions. In this paper, an additive manufacturing method of selective laser melting of ink-printed copper nanoparticles (SLM-IP Cu NPs) was introduced. Concave squared textures, convex squared textures and fully sintered Cu film were fabricated. The tribological performances of the fabricated samples showed that the convex squared texture possesses a better friction-reducing ability than the concave textures and the full Cu film. Moreover, the relationship between the dimensional parameters of the convex textures and the friction-reducing ability was also experimentally studied. The lubricating condition was analyzed to show that the surface structures fabricated by SLM-IP Cu NPs can provide the surface with a friction-reducing ability in mixed lubrication .
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Peng Wei,Yanxiang Liu,Zhihao Wang,Yangyang Huang,Yu Jin,Yi Liu,Shixiong Sun,Yuegang Qiu,Jian Peng,Yue Xu,Xueping Sun,Chun Fang,Jiantao Han,Yunhui Huang
NaTi2(PO4)3 (NTP) with a sodium superionic conductor three-dimensional (3D) framework is a promising anode material for sodium-ion batteries (SIBs) because of its suitable potential and stable structure. Although its 3D structure enables high Na-ion diffusivity, low electronic conductivity severely limits NTP’s practical application in SIBs. Herein, we report porous NTP/C nanofibers (NTP/C-NFs) obtained via an electrospinning method. The NTP/C-NFs exhibit a high reversible capacity (120 mA h g–1 at 0.2 C) and a long cycling stability (a capacity retention of ∼93% after 700 cycles at 2 C). Furthermore, sodium-ion full cells and hybrid sodium-ion capacitors have also been successfully assembled, both of which exhibit high-rate capabilities and remarkable cycling stabilities because of the high electronic/ionic conductivity and impressive structural stability of NTP/C-NFs. The results show that the nanoscale-tailored NTP/C-NFs could deliver new insights into the design of high-performing and highly stable anode materials for room-temperature SIBs.
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Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 21
·3246-3253
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IF 3.692
Sanyin Qu,Qin Yao,Bingxue Yu,Kaiyang Zeng,Wei Shi,Yanling Chen,Lidong Chen
Graphical Weight problem : Poly(3-hexylthiophene) (P3HT) films with various molecular weights are successfully prepared, and both their molecular structures and thermoelectric (TE) properties are investigated. The molecular weight of P3HT is found to have an important effect on the carrier-transport properties by affecting the molecular structure and, as a result, also has an effect on the TE performance. Poly(3-hexylthiophene) (P3HT) films with various molecular weights (MWs) were successfully prepared, and both their molecular structures and thermoelectric (TE) properties were investigated. It was found that the molecular weight of P3HT had an important effect on the carrier-transport properties by affecting the molecular structure and, as a result, also had an effect on the TE performance. The electrical conductivity of the P3HT films first increased upon increasing the molecular weight and then decreased at high molecular weights, whereas the Seebeck coefficient remained at the same level. As a result, the P3HT-M 50k (MW≈50 000 g mol −1 ) film reached an electrical conductivity of (103.8±1.2) S cm, which is more than 20 times higher than the electrical conductivity of P3HT-M 10k (MW≈10 000 g mol −1 ) and almost 30 % higher than the electrical conductivity of P3HT-M 100k (MW≈100 000 g mol −1 ). Consequently, the maximum TE power factor of P3HT-M 50k at room temperature was as high as (22.6±0.6) μW mK −2 , which is much higher than that of either P3HT-M 10k or P3HT-M 100k . Microstructure analysis combined with C-AFM suggested that carrier transport between most of the ordered and amorphous regions was unconnected in films with low molecular weights, and this resulted in a high migration barrier and poor carrier mobility. Upon increasing the molecular weight, the long molecular chain provided enough connectivity for the charge to move through the ordered regions, which decreased the carrier barrier and increased carrier mobility. Therefore, both the conductivity and Seebeck coefficient were significantly improved. However, a too-high molecular weight could cause more folding of the polymer chain, which would deteriorate the electrical-transport properties. The experimental results not only reveal the intrinsic effect of molecular weight on the electric transporting properties of conducting polymers but also suggest that molecular-weight engineering is an effective way to design and screen high-performance polymer TE materials.
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Chemistry of Heterocyclic Compounds
·
2018
·Vol. 54
·期 2
·125-129
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IF 1.201
Gao Huiqin,Wu Xiangwen
A 3-hydroxyflavone derivative as fluorescence chemosensor for copper and zinc ions has been synthesized. Its recognition properties for copper and zinc ions in aqueous solution were investigated based on UV-vis absorption and fluorescence spectra change. The compound exhibits color change from colorless to yellow and quenching of green fluorescence in the presence of copper ions in aqueous solution due to coordination reaction. In turn, the addition of zinc ions induces the color change from colorless to green and fluorescence enhancement of the compound. The complex ratios between the sensor molecule and copper(zinc) ions are 1:1 and 1:2, respectively, based on the Job's plots and in situ mass spectra. Thus, this compound can selectively recognize copper and zinc ions, and the recognition also can be observed by naked eye.
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