COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Jiahui Deng,Yalin Cheng,Min Liu,Biyang Tu,Shan Xue,Haisheng Tao
In this study, Fe-Mn co-embed sodium alginate carbon spheres (Fe-Mn/SA-C) were prepared as a cost-effective adsorbent for aqueous Cd(II) removal by a facile pyrolysis method. The morphology and chemical composition of Fe-Mn/SA-C were explored with various characterized techniques. The results indicate that Fe-Mn/SA-C possess porous structures and abundant oxide-based functional groups. Fe-Mn/SA-C exhibits excellent adsorption properties for aqueous Cd(II) and the adsorption process is pH-dependent. The adsorption data could fit pseudo second-order and Langmuir models well, suggesting that chemisorption is a dominant adsorption mechanism and the maximum adsorption capacity is 280.11 mg −1 . Thermodynamic analysis demonstrates that the adsorption is spontaneous and endothermic. The adsorption mechanisms of Cd(II) include the complexation of Cd(II) with oxygen-based functional groups, precipitation, and ion exchange. Finally, the granulated and magnetic Fe-Mn/SA-C is an efficient and practical adsorbent for cadmium-containing wastewater treatment.
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 1
·173-185
·
IF 5.693
Xie Peitao,Liu Yuan,Feng Mei,Niu Mang,Liu Chunzhao,Wu Nannan,Sui Kunyan,Patil Rahul Rangrao,Pan Duo,Guo Zhanhu,Fan Runhua
Carbon-based composites have gained extensive attention as microwave absorbing materials due to the lighter weight compared with other materials. In this work, Co/C nanocomposites with Co nanoparticles uniformly distributed in amorphous carbon sheets are prepared by a freezing dry and carbothermic reduction process. Hierarchical porous microstructures (micropores, mesopores, macropores) are achieved by ice template and huge amounts of gas during carbothermal reduction. Excellent absorption performance is achieved at a very low Co/C content (10% and 15%), which is a great success to design ultralight absorbers. At 10% content level, the effective absorption bandwidth is 5.0 GHz with a thin thickness of 1.8 mm, while the absorption bandwidth is 4.7 GHz with a thin thickness of 1.5 mm at 15% Co/C content level. The excellent absorption performance is attributed to excellent impedance matching resulting from synergy of cobalt and carbon and strong interfacial polarization induced by the hierarchical porous microstructures. This work provides a new pathway of designing ultralight absorbers with the advantage of thin thickness and wide bandwidth. Graphical Abstract
Excellent absorption performance is achieved at only 10% Co/C content level, a success to design ultralight absorbers.
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JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Yuan Deng,Jianyong Wei,Junlu Sun,Yanan Zhang,Lin Dong,Chong-Xin Shan
Mechanoluminescent materials that could convert mechanical energy into light energy have attracted increasing attention in recent years for their wide potential applications in stress sensing and imaging, structural damage monitoring, wearable illuminating devices, self-powered display, mechanical energy collection and conversion. However, their relatively low mechanoluminescence intensity greatly hinders the practical application. Here, we present a simple and effective strategy to enhance the mechanoluminescence performance of ZnS :Mn phosphor by Li ion co-doping. ZnS:Mn,Li phosphors of the hexagonal wurtzite structure have been prepared via high temperature solid phase sintering . The PL and ML intensity have been enhanced by 338% and 610% for samples obtained when 4 and 5 at. % Li is introduced in the precursor materials, respectively, in comparison with those without Li dopant . The photoluminescence lifetime of ZnS:Mn,Li decreases gradually, indicating the enhanced non-radiative energy transfer as the Li concentration increases. The electron paramagnetic resonance spectroscopy is carried out to investigate the changing tendency of the sulfur vacancy of samples with various Li-doping concentration. The mechanism for mechanoluminescence enhancement is supposed to be correlated with the increased sulfur vacancies by Li co-doping, which may facilitates the non-radiative energy transfer and thereby improve the luminescence properties of the samples. These findings provide a feasible strategy to enhance the mechanoluminescence performance of traditional ZnS derived phosphors, and may contribute to developing novel mechanoluminescence materials for practical applications.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 7
·1-7
·
IF 1.81
Li Peipei,Peng Xinsheng
Au–Cu bimetallic nanomaterials have attracted tremendous attention in the field of catalysis, water splitting, biosensor and biotherapy. Au 3 Cu nanocrystals with a definite stoichiometric ratio and ordered arrangement of atoms have shown great potential for efficient catalyts. Herein, we reported a new method for fabrication of Au 3 Cu nanocrystals. Their morphologies can be tuned by the amount of hydrochloric aqueous solution, including nanosquare and frame were achieved, respectively. The as-synthesized Au 3 Cu nanosquares not only demonstrated a comparatively high sensitivity of 324.8 μA mM −1 cm −2 as a non-enzymatic glucose sensor but also performed well in CO catalytic oxidation even at 50 °C with a conversion efficiency of 30 mmol g −1 h −1 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Deng Ding,Zhuo Jiang,Dong Ji,Myung Nosang Vincent,Ling Zan
To enhance the photocatalytic activity, co-catalysts are often utilized to accelerate rate-limited surface reactions. Herein, various amounts of bismuth oxyselenide (Bi 2 O 2 Se) ( i.e. , 5 to 25 wt%) as a novel co-catalyst were deposited on TiO 2 nanoparticles for photocatalytic hydrogen evolution reaction. The 15% Bi 2 O 2 Se/TiO 2 showed the best enhanced hydrogen production rate of 1240.7 μmol h −1 g −1 , which was about 50 times greater than that of pure TiO 2 . The SEM, EDX-Mapping and TEM revealed the mechanism of in-growth of Bi 2 O 2 Se on the TiO 2. Trapping experiment of superoxide free radical (O 2 − ) and transient photocurrent decay measurement also revealed that the recombination of the photogenerated electron–hole was remarkably suppressed in Bi 2 O 2 Se/TiO 2 compared to pure TiO 2 . Detailed analysis of XPS, transient photocurrent responses, electrochemical impedance spectroscopy (EIS) and DFT calculations indicated that there is a strong interaction between Bi 2 O 2 Se and TiO 2 , and the electrons of TiO 2 can be injected into Bi 2 O 2 Se. These findings show the potential of Bi 2 O 2 Se as co-catalytic materials and open a new avenue for solar water splitting.
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ACS Applied Bio Materials
·
2019
·
IF 0
Jiantao Yu,Jing Li,Shiyao Zhai,Li Lin,Kui Wang,Bin Tang,Hong Meng,Leilei Tian
Polymerization of small interfering RNA (siRNA) has been demonstrated as a promising strategy to improve siRNA delivery, which will change the low-charge and rigid properties of single siRNA and enhance its electrostatic interactions with cationic polymers. For such polymerization strategy, a major breakthrough is still needed to fully eliminate chemical processes and further improve the nanocomplex-forming ability of polymerized siRNAs. Herein, the extremely strong interaction between the DNA product of rolling circle amplification (RCA) and linear poly(ether imide) (PEI) has been disclosed; accordingly, a stable nanocomplex is formed just at its charge neutralization point, which benefits from the high molecular weight of the RCA product (>3 000 000 Da). In addition, as the sequence of the RCA product is determined by the cyclic template, the programmable nature of DNA can simplify the optimization process and maximize the hybridization efficiency between RCA and sticky siRNAs, realizing a superior siRNA polymerization efficiency. Depending on these two effects, the RCA DNA is utilized as a cocarrier material to organize siRNA polymerization and substantially reduce the usage amount of PEI, which greatly improves RNAi efficiency of PEI/RCA-siRNA polyplex both in vitro and in vivo, providing evidence that RCA DNA is a promising material to promote the RNAi-based therapeutics.
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PubMed
OPTIK
·
2019
·
IF 1.914
Yulin Shi,Yudong Xu,Wenjie Hu,Lei Wang,Ruliang Liu,Heni Wang,Caiyue Zhao,Xinyi Chen,Min Shi
In this article, the authors prepared CaMgAl 10 O 17 : Sm 3+ , CaMgAl 10 O 17 : Eu 3+ and CaMgAl 10 O 17 : Sm 3+ , Eu 3+ phosphors via high temperature solid-state reaction and studied the phase constituents and photoluminescence (PL) of the phosphors as-synthesized. The main emission peaks of CaMgAl 10 O 17 : Sm 3+ at 559 nm, 590 nm and 639 nm are due to 4 G 5/3 → 6 H 5/2 , 4 G 5/3 → 6 H 7/2 and 4 G 5/3 → 6 H 9/2 transitions of Sm 3+ activator, respectively. The optimum doping concentration of Sm 3+ in CaMgAl 10 O 17 is 3 mol. %. The main emissions of CaMgAl 10 O 17 : Eu 3+ peaked at 586 nm and 610 nm belong to 5 D 0 → 7 F J (J = 1, 2) transitions of Eu 3+ activator. When Eu 3+ ions are added into CaMgAl 10 O 17 : 0.03 Sm 3+ phosphors, an energy transfer between Sm 3+ and Eu 3+ via an electrical multipole interaction occurs, and the emission intensity of CaMgAl 10 O 17 : 0.03 Sm 3+ , Eu 3+ phosphors is greatly improved.
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高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2023
·
IF 0.7
Chao Feng,Chang-Peng Lv,Jing-Jing Guo,Dong-Xu Li,Juan-Ni Zhang
The article discusses the synthesis and characterization of a new Cu-based complex, [Cu(Hpz)4SO4]]•[Cu(Hpz)4(H2O)SO4]•H2O (1), obtained via solvothermal method with the ligand 1H-pyrazole (Hpz). The complex exhibits a co-crystal structure composed of two independent units. The crystal structure was further confirmed by PXRD Rietveld refinement. In three-electrode system tests, the electrode made from this co-crystal complex displayed a high specific capacitance and a good cycling stability. At a scan rate of 3 mV s−1, the maximum specific capacitance was 242.4 F g−1, and after 2000 cycles at a current density of 2 A g−1 in a 1 M KOH solution, a capacitance of 95.5% was retained.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qianqian Fu,Hui Wang,Kunlun Nie,Xuyun Wang,Jianwei Ren,Rongfang Wang
In the large-scale implementation of renewable energy devices, the availability of stable and highly catalytic non-precious metal catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial. Meanwhile, integrating bifunctional electrocatalysts simultaneously on both the anode and cathode still faces challenges. To address this, a stepped preparation strategy was adopted on a nickel foam (NF) substrate to synthesize P, S co-doped NiCoP x S y nanowire array catalysts. The prepared NiCoP x S y catalysts demonstrated a small Tafel slope of 72.5 mV dec −1 for HER and 72.3 mV dec −1 for OER by requiring only 37 mV (326 mV) overpotential to achieve a current density of 10 mA cm −2 (50 mA cm −2 ). Moreover, when assembled into an electrolytic cell in 1 M KOH, the NiCoP x S y catalysts achieved a low voltage of 1.55 V at 10 mA cm −2 current density and exhibited long-term stability. The outstanding electrocatalytic performance can be attributed to the influence of doped anions on the electronic states and distribution among different atoms, which thereby positively affected the electrocatalytic activity. This research provides an effective method for designing innovative catalysts and paving the way to produce clean energy.
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高影响因子
MOLECULAR PHARMACEUTICS
·
2023
·
IF 4.9
Qingfa Tang,Yao Chen,Yusheng Zhang,Kewei Wang,Li Liu,Dongmei Pan,Qiang Liu,Cuiping Jiang
Tanshinone IIA (TS-IIA) and salvianic acid A (SAA) are the main pharmacological active constituents of Danshen, which exhibit potent effects on atherosclerosis. A combination of TS-IIA and SAA might exert a synergistic antiatherosclerotic effect. However, the opposite solubility profiles of TS-IIA and SAA might lead to difficulty in achieving a synergistic combined effect of the two active components. Therefore, in this work, we fabricated a ROS-responsive prodrug micelle for the codelivery of TS-IIA and SAA (TS-IIA-PM) by self-assembling amphiphilic block copolymer PEG5000-SAA/PLA10000-APBA. The amphiphilic polymer was characterized by 1H NMR, FTIR, and alizarin red S competition tests. The ROS responsiveness of TS-IIA-PM was evidenced by time-course monitoring of particle size and morphology changes and drug release behavior in the presence of 1 mM H2O2. We found TS-IIA-PM was stable according to its critical micelle concentration and the unchanged particle sizes in 10% FBS for 7 days. The results of in vitro and in vivo tests revealed that TS-IIA-PM was safe and biocompatible. Furthermore, it was observed that TS-IIA and prodrug micelle could produce synergistic antiatherosclerotic effect based on the results of the antioxidant study, which was further confirmed by a series of pharmocodynamics studies, such as in vitro DiI-oxLDL uptake study, oil red O staining, cholesterol efflux study, inflammatory cytokine analysis, in vivo CD68 immunostaining, and lipid disposition staining studies. Collectively, TS-IIA-PM holds great potential for the safe and efficient codelivery of TS-IIA and SAA for synergistic antiatherosclerosis.
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PubMed
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 12
·7877-7888
·
IF 5.7
Gan Lin,Zheng Shuyu,Huang Jin
Gas adsorption materials, such as active carbon and zeolite, are known to cause second pollution after being used, due to their non-degradability. In this study, we prepared a degradable aerogel material based on cellulose nanocrystals (CNCs) and poly vinyl alcohol (PVA) with hierarchical pores and excellent CO \(_2\) -adsorption performance. The micropores, with specific area of 442 m \(^2\cdot\) g \(^{-1}\) , are obtained via in-situ growing MIL-100(Fe) on CNCs and concurrently assembling those CNC particles. The resulting aggregate is further introduced into degradable PVA aerogels, who offer mesopores and macropores. The resulting degradable material has a density of 0.216 g \(\cdot\) cm \(^{-3}\) and can adsorb 0.357 mmol CO \(_2\) per gram. This makes it a promising candidate for use in the preparation of light weight CO \(_2\) collectors.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-11
·
IF 2.8
Chen Fanfan,Xiao Yao,Yan Sitong,Fang Lin,Wang Zhifen,Liao Jianhe
Modifying natural rubber latex (NRL) and blending it with NRL can improve NRL performance and expand application fields. The performance of co-blended latex will change due to changes in non-rubber components during storage. Therefore, it is important to study the change of properties during the storage of co-blended latexes. In this paper, 30% methyl methacrylate grafted natural rubber (MG30) was synthesized by cumene hydroperoxide/ tetraethylenepentamine (CHPO/TEPA) initiating system, MG30 and NRL were mixed in different proportions to study the morphology and physical and mechanical properties, and the colloidal properties and emulsion properties of co-blended latexes were studied during storage. The results showed that the mechanical stability of NRL and co-blended latexes were high and the viscosity gradually increased during storage. The study of the vulcanization characteristics of the co-blended latexes films and the physical and mechanical properties of the vulcanized latex films showed that the vulcanization time of the co-blended films increased and the torque value increased in comparison to NRL. With the increase of MG30 content, the tensile strength and tear strength of the co-blended latexes vulcanized films showed a trend of increasing and then decreasing, and the co-blended film with 10% MG30 showed the best mechanical properties.
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