CHEMICAL PHYSICS LETTERS
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2022
·
IF 2.719
Peng Yong,Sheng Wang,Xu Zhang,Haibo Pan,Shuifa Shen
Shape controlled preparation and doping are important means to improve the gas sensitivity of metal oxide semiconductor materials. In this work, pure and Co-doped In 2 O 3 porous hollow hexagonal cylinders were successfully prepared using metal–organic frameworks (MOFs) MIL-68(In) as self-sacrificial template. The size of the MIL-68(In) hexagonal cylinder is uniform, and the In 2 O 3 obtained after pyrolysis better inherits the shape of the MIL-68(In), but becomes hollow, and the cylinder surfaces are porous. The product has a large specific surface area (46.52 m 2 /g), and the doping of Co significantly increases the oxygen vacancy of the material. The Co-doped sample obtained by pyrolysis at 500℃ has excellent gas sensing performances to ethanol gas, its sensitivity to 100 ppm ethanol gas at 210 ℃ is 14.6, response/recovery time is 21 s and 107 s, and the sensing selectivity to ethanol is also good.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 7
·2100245
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IF 1.599
Yihua Pan,Shoulei Xu,Siyao Li,Daini Wang,Yuhua Yang,Wenxia Wu,Bernard A. Goodman,Shengdi Ta,Wen Deng
Blue, green, and red emissions through upconversion and energy transfer processes are investigated as a function of the Tm 3+ concentration in Tm/Er/Yb triply doped yttria stabilized zirconia (YSZ) crystals upon excitation at 980 nm. YSZ doped with 0.075–0.250 mol% Tm 2 O 3 , 1.50 mol% Er 2 O 3 , and 2.00 mol% Yb 2 O 3 are prepared by the optical floating zone method, and confirmed to be in the cubic phase by X-ray diffraction. The blue emission corresponds to the Tm 3+ 1 G 4 → 3 H 6 transition, and is produced through a three-photon process, whereas the green and red light are emitted through two-photon processes from the Er 3+ 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions for green and the Er 3+ 4 F 9/2 →4I 15/2 transition for red. However, interactions between the different lanthanide ions is a factor in determining the overall color of these triply doped crystals, and this is not simply a summation of the results from the singly doped systems, so this mechanism of energy transfer is discussed in detail. The CIE color chromaticity coordinates for the present samples under excitation at 980 nm approach (0.39, 0.55), which is in the yellow-green region.
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JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Yi Liu,Ying Chen,Yunli Liu,Zewen Chen,Huan Yang,Zhongxiao Yue,Qing Fang,Yunfei Zhi,Shaoyun Shan
Solar energy is considered as the cleanest, cheapest, and most sustainable energy source, and CO 2 cycloaddition that is drove by solar energy has unique advantages in the aspect of energy and environmental. Therefore, Zn and N co-doped porous carbon nanosheets (ZNCs), which were synthesized by a simple one-step pyrolysis method, as catalysts and photothermal material to photothermally drive cycloaddition of CO 2 . The prepared ZNCs show graphene-like layered structure, uniformly distributed Lewis acid (Zn atoms) sites and Lewis base (N atoms) sites, full spectrum absorption and high photothermal conversion efficiency. More importantly, ZNCs have a higher catalytic efficiency than traditional heating methods because it can be quickly in-situ heated by light, hence the yield of cyclic carbonate reached 91.1% (0.1 MPa CO 2 , 1000 mW·cm −2 full-spectrum irradiation, 12 h). ZNCs were recycled five times without significant reduction in catalytic efficiency, and have high activity to other series of epoxides. A possible CO 2 cycloaddition mechanism which is catalyzed by ZNCs is proposed, including the step of adsorption, ring opening, insertion and cyclic carbonates formation.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 2
·1302-1313
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IF 4.682
He Fupo,Qiu Chao,Wang Yao,Lu Teliang,Ye Jiandong
The aim of this study was to fabricate silicon/gallium co-substituted tricalcium phosphate bioceramics having the ability to promote osteoblast activities as well as hinder osteoclast activities. The silicon/gallium co-substituted tricalcium phosphates were synthesized with a solid-state reaction route, and their bioceramics were prepared by the process of molding and sintering. The bioceramics were characterized employing X-ray fluorescence spectroscopy, X-ray diffraction and scanning electron microscopy. Porosity and compressive strength tests, and experiments for in vitro cell response evaluation were performed. The results manifested that silicon/gallium co-substitution promoted transition of β-tricalcium phosphate to α-tricalcium phosphate and additionally gave rise to new phases of silicocarnotite and Ca 2 SiO 4 . In contrast to a single gallium substitution, the silicon/gallium co-substitution retarded the densification process but retained the high mechanical strength of bioceramics, and maintained the inhibitory effect of gallium on the osteoclast activities. The tricalcium phosphate bioceramics with substitutions of 2.5 mol% gallium and 10 mol% silicon possessed considerable mechanical strength, enhanced osteoblast activities and restrained osteoclast activities, so they were expected to efficiently reconstruct the bone defects in the environment of osteoporosis.
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Pharmaceutics
·
2023
·Vol. 15
·期 5
·1500
·
IF 5.4
Yi Lu,Ting Xiao,Rongrong Lai,Ziyi Liu,Weixuan Luo,Yixuan Wang,Shijia Fu,Guihong Chai,Jinjing Jia,Yuehong Xu
Rheumatoid arthritis (RA) is an autoimmune disease of synovial inflammation that affects populations worldwide. Transdermal drug delivery systems for treating RA have increased but remain challenging. We fabricated a dissolving microneedle (MN) system with photothermal (PT) polydopamine (PDA) to co-load the non-steroidal anti-inflammatory drug loxoprofen (Lox) and the Janus kinase inhibitor tofacitinib (Tof), with the aim of co-delivering Lox and Tof directly to the articular cavity, aided by the combination of MN and PT. In vitro and in vivo permeation studies showed that the PT MN significantly promoted drug permeation and retention in the skin. An in vivo visualization of the drug distribution in the articular cavity showed that the PT MN significantly promoted drug retention in the articular cavity. Importantly, compared to the intra-articular injection of Lox and Tof, the application of the PT MN to a carrageenan/kaolin-induced arthritis rat model exhibited superior performance in reducing joint swelling, muscle atrophy, and cartilage destruction. Furthermore, the PT MN downregulated the mRNA expression levels of proinflammatory cytokines, including TNF-α, IL-1β, iNOS, JAK2, JAK3, and STAT3. The results show that the PT MN transdermal co-delivery of Lox and Tof is a new synergetic therapy with high compliance and good therapeutic efficacy for RA.Keywords:loxoprofen;tofacitinib;microneedle;photothermal therapy;rheumatoid arthritis
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RSC Advances
·
2023
·Vol. 13
·期 33
·22831-22837
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IF 3.9
Bin Li,Wenrui Hao,Aolin Wu,Mengjing Zhou,Qinghua Yan,Heng Zhang,Lihua Su
The present study synthesized a deep eutectic solvent (DES) using acrylic acid (AA), acrylamide (AM), and choline chloride (ChCl), and added phytic acid (PA) as a filler. Subsequently, the PA/P(AA-co-AM) composite hydrogel was prepared under ultraviolet irradiation and used a photoinitiator. Characterization of the hydrogels was conducted using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The study aimed to investigate the impact of PA on the mechanical properties, fatigue resistance, and electrical conductivity of the composite hydrogel. The findings demonstrated that as the mass fraction of PA increased, the compressive strength of the composite hydrogel gradually decreased, yet the fatigue resistance of the composite hydrogel increased. Specifically, after 10 cycles of compression, the resilience recovery rate of FP0 dropped from 86.9% to 70.4%, the maximum stress recovery rate of FP1 dropped from 97.9% to 89.4%, the maximum stress recovery rate of FP2 dropped from 94.4% to 86.6%, and the maximum stress recovery rate of FP3 dropped from 97.3% to 93%. Overall, this study offers a straightforward and efficient method for producing composite hydrogels with both fatigue resistance and electrical conductivity.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2023
·
IF 5
Jing Su,Weijia Lu,Yexuan Guo,Zhuoyi Liu,Xu Wang,Hong Yan,Rui Xue Zhang
Periocular routes represent a promising approach to chronic eye therapy due to its unique exploitation of scleral structure. Especially, for ophthalmic infection requiring prolonged medication, sclera-traversing dosage forms capable of co-delivery of multiple drugs are highly desirable. Herein, phosphatidylcholine-based liposomes co-loading water soluble steroid dexamethasone and antibiotics moxifloxacin (LIP-DM) was developed for transscleral delivery of dual drugs. The size, mono-dispersity and drug entrapment of LIP-DM prepared by microfluidics were highly influenced by varying amounts of lipid composition. Final LIP-DM composing 63mol% phospholipid and 37mol% cholesterol was characterized of colloidal stable unilamellar structure with sub-100 nm size and entrapment of 0.412 mg and 1.21 mg for dexamethasone and moxifloxacin, respectively. Transport of LIP-DM using rabbit scleral tissues showed time-dependent particle penetration and accumulation from episcleral to intraocular side. Compared to immediate release of drugs in solution, LIP-DM exhibited differential release of dual drugs with fast antibiotics release and slow steroid release within 1 day, which in turn increased the transscleral contact time yet maintained effective permeability of dual drugs, leading to the rapid bacteriostatic onset and enhanced inhibition of proinflammatory cytokines in human retinal pigment epithelial cells. The results highlight liposomes as a potential transscleral depot of drug combination for the long-term vision care.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Yuelong Xu,Jingyue Wang,Shasha Wang,Zuozhao Zhai,Bin Ren,Zhi Tian,Lihui Zhang,Zhenfa Liu
Multifunctional electrocatalysts are desirable for overall water splitting and zinc-air batteries. In this work, N, S co-doped carbon nanotubes (CNT-NS) with a plentiful of defects were obtained through a novel molecular-level codoped and lattice defect construction method. Thiamine hydrochloride and thiocarbamide were adopted as new precursors in situ doping N and S into multi-walled CNTs surfaces, and lattice defects were constructed by in situ chemical etching using ammonium chloride and ammonium bicarbonate . These surface defects and N,S biatom co-doping synergistic effects can accumulate the CNT-NS to exhibit the superior behavior for electrocatalysis of water splitting and zinc-air batteries. The overpotential for overall water splitting was 1.61 V and the specific capacity for zinc-air batteries was 781 mA h g −1 , which was superior to previous works. According to the Operando Raman spectroscopy measurements, the S atoms can serve as the intrinsic catalytic sites for HER and OER , and the defective CNT structures could enhance the catalytic kinetics by the electron-transfer process. Further, density functional theory (DFT) results also indicated the contribution of binary atoms co-doping for low ΔG H∗ values. Therefore, this work provides the valuable reference for rational design/construction for metal-free catalysts of overall water splitting.
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INORGANICA CHIMICA ACTA
·
2021
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IF 2.545
Tingting Gu,Isaac Kwaku Attatsi,Weihua Zhu,Minzhi Li,Samuel A. Ndur,Xu Liang
Non-precious metal catalysts can effectively evolve hydrogen in aqueous media, but a highly efficient metal-based catalyst is still a significant assignment. Herein, Co(II)phthalocyanine was noncovalently immobilized on multiwalled carbon nanotubes through axial coordination via pyridine-pyrene linker and applied towards hydrogen evolution reactions. This material provided a superiorly enhanced electrocatalyzed performance signifying high efficiency. With this behaviour, our target material we believe paves the way towards designing efficient energy production and storage devices.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Pengchao Ren,Weifeng Tu,Chanchan Wang,Sifan Cheng,Wenqi Liu,Zhenzhou Zhang,Yun Tian,Yi-Fan Han
This study investigated the Cu-CeO 2 interactions for CO hydrogenation to methanol by applying rate measurements, chemical titration/desorption, together with in-situ/operando spectroscopy techniques under realistic reaction conditions. Ce components were enriched in the surface region of Cu/CeO 2 catalysts while Ce 3+ and Ce 4+ atoms co-existed during CO hydrogenation. The ratio of Ce 3+ to Cu 0 in the surface region of catalysts increased linearly with the Ce content. The turnover rates of CH 3 OH formation increased as a single-valued function of the ratio, irrespective to the individual contact extent between Cu and CeO 2 clusters or Ce content in the Cu/CeO 2 catalysts, indicating that the Cu 0 -Ce 3+ sites pair acts as active sites for CO hydrogenation to methanol over Ce-CeO 2 samples. This study also unraveled that formyl and formate species, as reactive surface intermediates, were co-adsorbed on the Cu 0 -Ce 3+ sites, and their hydrogenation routes occurred concurrently for CH 3 OH formation during CO-H 2 reactions.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-11
·
IF 5.833
Ma Junping,Bai Wushuang,Liu Xiaoli,Zheng Jianbin
Integrating other metal ions into mono-metallic metal–organic framework (MOF) to form bi-metallic MOF is an effective strategy to enhance the performance of MOFs from the internal structure. In this study, two-dimensional (2D) cobalt/zinc-porphyrin (Co/Zn-TCPP) MOF nanomaterials with different Co/Zn molar ratios were synthesised using a simple surfactant-assisted method, and novel dopamine (DA) sensing methods were constructed based on these materials. The characterisation results showed that all MOF with different Co/Zn molar ratios presented a nanofilm, and the Co and Zn elements were uniformly distributed. All sensors based on Co x Zn 100− x -TCPP had a certain catalytic performance to DA. Among them, the sensor based on CO 25 Zn 75 -TCPP showed the strongest signal response, indicating that the catalytic performance of MOF on DA can be adjusted by changing the Co/Zn molar ratio. The doping of metal ions improves the chemical environment of the pores, and increases the types and spatial arrangement of the active sites of the MOF, which is beneficial to the electron transfer and exchange with DA; Co 2+ and Zn 2+ active centres have a synergistic promotion effect, so the catalytic activity of MOF is significantly improved. The linear range at the potential of 0.1 V based on Co 25 Zn 75 -TCPP for DA was 5 nM–177.8 μM, with a detection limit of 1.67 nM (S/N = 3). The sensor exhibited a good selectivity for detecting DA. This research is expected to provide new ideas and references for constructing high-performance sensing interfaces and platforms. Graphical abstract
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Ming Luo
In this work, a novel electrochemical sensor has been constructed for the simultaneous detection of phenol based on the 2D nickel cobalt pyrophosphate nanosheets. The nickel cobalt pyrophosphate was prepared by a facile hydrothermal method. The prepared 2D nickel cobalt pyrophosphate nanosheet was characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The bimetal nickel cobalt pyrophosphate exhibited favorable catalytic activity in phenol detection. The excellent sensing performance of nickel cobalt pyrophosphate was attributed to its charge transfer mobility and abundant catalytic sites. The nickel cobalt bimetal pyrophosphate was applied to modify glass carbon electrode (GCE) and the obtained sensor processed satisfactory analytic performance in practical detection of phenol. The fabricated electrochemical sensor also exhibited a limit of detection of 0.25 μM and a linear range of 0.5-100 μM using square wave voltammetry (SWV) toward phenol. Besides, the electrochemical sensor showed desirable selectivity, long-term stability and reliable recoveries in real sample test.
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