Science China-Chemistry
·
2013
·Vol. 57
·期 3
·397-401
·
IF 1.327
Zhang QiBo,Hua YiXin,Wang Rui
Direct electroreduction of solid cuprous chloride to prepare copper powder in a “neutral” ambient-temperature ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid (BMIMBF 4 ) was investigated. Cyclic voltammetry of the CuCl powder in a Pt-powder cavity microelectrode exhibited that solid CuCl can be electrochemical reduced in the ionic liquid. Chronoamperometry of the salt powder filled Mo-cavity electrode (current collector) in the ionic liquid further demonstrated the conversion of chloride-to metal inside the cavity, as confirmed by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction spectra.
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高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-7
·
IF 2.779
Wu Shufen,Yan Songjing,Qi Wei,Huang Renliang,Cui Jing,Su Rongxin,He Zhimin
We demonstrated a facile and environmental-friendly approach to form gold nanoparticles through the reduction of HAuCl 4 by aspartame. The single-crystalline structure was illustrated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The energy-dispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FTIR) results indicated that aspartame played a pivotal role in the reduction and stabilization of the gold crystals. The crystals were stabilized through the successive hydrogen-bonding network constructed between the water and aspartame molecules. Additionally, gold nanoparticles synthesized through aspartame were shown to have good catalytic activity for the reduction of p -nitrophenol to p -aminophenol in the presence of NaBH 4 .
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 6
·6181-6190
·
IF 1.833
Wang Meng-Meng,Liu Shi-Wei,Li Lu,Yu Shi-Tao,Xie Cong-Xia,Song Zhan-Qian
Rosin hydrogenation using polyvinylpyrrolidone (PVP)-stabilized Pd colloidal nanoparticles as catalyst in an aqueous/organic biphasic system was investigated. The influence of preparation methods on the size of Pd nanoparticles for hydrogenation of rosin was marked. Compared with traditional catalysts Pd/C and Raney-Ni, PVP-stabilized Pd colloidal nanoparticles showed excellent catalytic activity and promoted formation of the product tetrahydroabietic acid (THAA). More than 93 % rosin was hydrogenated, and the mass fraction of THAA was 54.2 % when the reaction was carried out at 160 °C for 4 h. It was also found that PVP-stabilized Pd colloidal nanoparticles exhibited good reusability for hydrogenation, with no obvious decrease in catalytic performance when reused six times.
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TRANSITION METAL CHEMISTRY
·
2014
·Vol. 39
·期 5
·577-584
·
IF 1.402
Li Xin,Bi Cai-Feng,Fan Yu-Hua,Zhang Xia,Wei Xiao-Dan,Meng Xiang-Min
A ternary coordination complex 2Cu(C 14 H 8 NO 3 Cl)(C 12 H 8 N 2 )·3CH 3 OH of a Schiff base (C 14 H 8 NO 3 Cl: 4-chloroanthranilic acid–salicylaldehyde) was synthesized from 4-chloroanthranilic acid, salicylaldehyde, copper acetate and 1,10-phenanthroline and characterized by physicochemical and spectroscopic methods. X-ray crystallography shows that the copper atom is five coordinated by the imine nitrogen, two nitrogen atoms from 1,10-phenanthroline, the hydroxyl oxygen and the carboxylate oxygen atom. The interaction of the complex with calf-thymus DNA was investigated by UV absorption spectroscopy, fluorescence emission spectroscopy and viscosity. In addition, the cleavage reaction with pBR322 supercoiled plasmid DNA was investigated. The complex binds to DNA and also exhibits significant DNA cleavage activity.
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Silicon
·
2024
·Vol. 16
·期 13
·5417-5429
·
IF 2.8
Ding Zhe,Guo Li,Hua Chao,Chen Jinyi,Lu Ping
The thermodynamic data for the low-temperature hydrogenation of silicon tetrachloride (STC) were calculated using density functional theory with W1 theory. Based on these calculations, the equilibrium concentration distribution was determined for different temperatures (373.15–1173.15 K), pressures (1–40 atm), and composition ratios of H 2 /STC (0.2–4) using the principle of chemical equilibrium. It was observed that the conversion rate and selectivity rate decreased with increasing temperature, while they increased with increasing pressure and composition ratio of H 2 /STC. The selectivity rate could only be significantly altered under extreme conditions. When the temperature and pressure were fixed, the yield reached its theoretical maximum when the composition ratio of H 2 /STC was between 0.5 and 1. Furthermore, sensitivity analysis results revealed that pressure and composition were the primary parameters influencing conversion, with temperature having only about one-tenth of their impact on the conversion rate. Ultimately, the experimental results were in good agreement with the calculated results, confirming the acceptability of the thermodynamic analysis.
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-5
·
IF 3.125
Hua Qiqi,Dai Dongyang,Zhang Chengzhi,Han Fei,Lv Tiezheng,Li Xiaoshan,Wang Shijie,Zhu Rui,Liao Haojie,Zhang Shiguo
Although several Si/C composite structures have been proposed for high-performance lithium-ion batteries (LIBs), they have still suffered from expensive and complex processes of nano-Si production. Herein, a simple, controllable oxygen inward diffusion was utilized to transform Si sludge obtained from the photovoltaic (PV) industry into the nano-Si/SiO x structure as a result of the high diffusion efficiency of O inside Si and high surface area of the sludge. After further process, a yolk/shell Si/C structure was obtained as an anode material for LIBs. This composite demonstrated an excellent cycling stability, with a high reversible capacity (∼ 1250 mAh/g for 500 cycles), by void space originally left by the SiO x accommodate inner Si expansion. We believe this is a rather simple way to convert the waste Si into a valuable nano-Si for LIB applications.
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Nanoscale Research Letters
·
2012
·Vol. 7
·期 1
·1-7
·
IF 2.726
Li Wei,Xu Yaohui,Zhou Yang,Ma Wenhui,Wang Shixing,Dai Yongnian
Silica nanoparticles have been functionalized by click chemistry and atom transfer radical polymerization (ATRP) simultaneously. First, the silanized silica nanoparticles were modified with bromine end group, and then the azide group was grafted onto the surface via covalent coupling. 3-Bromopropyl propiolate was synthesized, and then the synthesized materials were used to react with azide-modified silica nanoparticles via copper-mediated click chemistry and bromine surface-initiated ATRP. Transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis were performed to characterize the functionalized silica nanoparticles. We investigated the enrichment efficiency of bare silica and poly(ethylene glycol) methacrylate (PEGMA)-functionalized silica nanoparticles in Pb(II) aqueous solution. The results demonstrated that PEGMA-functionalized silica nanoparticles can enrich Pb(II) more quickly than pristine silica nanoparticles within 1 h.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 44
·期 1
·705-720
·
IF 1.369
Hu Wenyuan,Dong Faqin,Zhang Jing,Liu Mingxue,He Huichao,Yang Dingming,Deng Hongquan
A flaky photocatalytic composite of anatase@natural rutile(A@NR) was obtained using one-step microwave hydrothermal synthesis, which was designed to overcome the low photocatalytic efficiency stemming from high electron-hole recombination and a narrow photoresponse range. The characterizations were completely elucidated using X-ray diffraction, field emission scanning electron microscopy, Brunauer Emmett Teller surface area, ultraviolet–visible diffuse reflectance spectroscopy, and photoluminescence spectra. The efficiency of A@NR in photocatalytic degradation of methyl orange was determined to be close to that of P25 under UV light and superior to that of P25 under visible light. The excellent photocatalytic activity results from the synergistic effects of substituting Fe ions, which alter the band structure, and the isomerism of anatase and natural rutile, which separates the photogenerated electron holes. The calculated apparent quantum efficiencies of 32.8 and 12.9% for A@NR, under UV and visible light irradiation, respectively, show a higher catalytic activity and a more effective photoinduced electron-hole separation in A@NR than in P25.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 18
·7718-7730
·
IF 4.5
Huang Peng,Zhang Yaping,Wang Bin,Zhu Xinhua,He Yufeng,Song Pengfei,Wang Zeyuan,Wang Rongmin
With the increasing risk of bacterial infections, antimicrobial materials have been paid attention and rapidly becoming the main components for alleviating bacterial pathogens, while synthetic polymer antibacterial materials play a crucial role. In this work, a series of acryloyl copolymer core–shell microspheres (AcCPMs) with cationic groups on its surface were synthesized by using acrolyl cationic monomers, methyl methacrylate and styrene through two-step polymerization and in-situ assembly. The micro-morphologies, structures and sizes of AcCPMs were characterized by SEM, TEM, XPS, FT-IR and dynamic light scattering. And the antibacterial activity was also evaluated against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). It indicated that all of AcCPMs have antibacterial activity, and the highest antibacterial rate was 97.0%, because the structure–activity relationship of AcCPMs, including alkyl chain length, cationic groups and the type of anions in quaternary ammonium salts affected their microstructure and antibacterial activity. In summary, the microstructure and antibacterial activity of the acryloyl copolymer core–shell microspheres could be adjusted by varying alkyl chain length and cationic groups. The method of preparing microspheres could be used to synthesize antibacterial coatings, and acryloyl copolymer core–shell microspheres could be applied in biomedical and environmental area. Graphical
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Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-16
·
IF 7.3
Yang Shuo,Li Kaiyue,Huang Ping,Liu Keyan,Li Wenhui,Zhuo Yuquan,Yang Ziwen,Han Donglai
This study introduces a multifunctional device based on Cu 2 O/g-C 3 N 4 monitoring and purification p–n heterojunctions (MPHs), seamlessly integrating surface-enhanced Raman scattering (SERS) detection with photocatalytic degradation capabilities. The SERS and photocatalytic performances of the Cu 2 O in various morphologies, g-C 3 N 4 nanosheets (NSs) and Cu 2 O/g-C 3 N 4 MPHs with different g-C 3 N 4 mass ratios were systematically evaluated, with a particular emphasis on the Cu 2 O/g-C 3 N 4 -0.2 MPH, where g-C 3 N 4 constituted 20% of the total mass. Multiple optical and electrochemical tests revealed that the Cu 2 O/g-C 3 N 4 -0.2 MPH effectively enhances charge separation and reduces charge transfer resistance. The Cu 2 O/g-C 3 N 4 -0.2 SERS sensor exhibited a relative standard deviation (RSD) below 15% and achieved an enhancement factor (EF) of 2.43 × 10 6 for 4-ATP detection, demonstrating its high sensitivity and consistency. Additionally, it demonstrated a 98.3% degradation efficiency for methyl orange (MO) under visible light within 90 min. Remarkably, even after 216 days, its photocatalytic efficiency remained at 93.7%, and it retained an 84.0% efficiency after four cycles. XRD and SEM analyses before and after cycling, as well as after 216 days, confirmed the structural and morphological stability of the composite, demonstrating its cyclic and long-term stability. The excellent performance of the Cu 2 O/g-C 3 N 4 MPH is attributed to its Z-type mechanism, as verified by radical trapping experiments. The evaluation of the self-cleaning performance of the Cu 2 O/g-C 3 N 4 -0.2 SERS sensor demonstrated that its Z-scheme structure not only provides excellent self-cleaning capability but also enables the detection of both individual and mixed pollutants, while significantly enhancing the SERS signal response through an effective charge transfer enhancement mechanism.
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BMC Ophthalmology
·
2023
·Vol. 23
·期 1
·1-24
·
IF 2
Zhang Zengrui,Mu Jingyu,Wei Jing,Geng Haoming,Liu Chunmeng,Yi Wenhua,Sun Yue,Duan Junguo
Background Refractive errors are one of the most common ocular conditions among children and adolescents, with myopia showing an increasing prevalence and early onset in this population. Recent studies have identified a correlation between refractive errors and ocular biometric parameters. Methods A systematic search was conducted in electronic databases including PubMed, EMBASE, Cochrane Library, Web of Science, and Medline from January 1, 2012, to May 1, 2023. Various ocular biometric parameters were summarized under different refractive states, including axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), corneal curvature (CC), Corneal curvature radius (CR),axial length-to-corneal radius ratio (AL/CR ratio), choroidal thickness (ChT), retinal thickness (RT), retinal nerve fiber layer thickness (RNFL), and retinal blood density (VD). The differences in these parameters among different refractive states were analyzed using Stata software with fixed or random-effects models, taking into account the assessed heterogeneity level. Results This meta-analysis included a total of 69 studies involving 128,178 eyes, including 48,795 emmetropic eyes, 60,691 myopic eyes, 13,983 hyperopic eyes, 2,040 low myopic eyes, 1,201 moderate myopic eyes, and 1,468 high myopic eyes. The results of our study demonstrated that, compared to the control group (emmetropic group), the myopic group and low, moderate, and high myopic groups showed significant increases in AL, AL/CR ratio, and ACD, while the hyperopic group exhibited significant decreases. Compared to the control group, the myopic group had a significantly increase for CC, while CR, CCT, perifoveal RT, subfoveal ChT, foveal ChT, parafoveal ChT, perifoveal (except nasal) ChT, and pRNFL (except temporal) significantly decreased. Compared to the control group, the hyperopic group had a significantly increase for subfoveal ChT, foveal ChT, parafoveal ChT, perifoveal ChT, and nasal pRNFL. Compared to the control group, the low and moderate myopic groups had a significantly decreases for the CCT, parafoveal RT (except nasal), perifoveal RT (except nasal), and pRNFL (except superior and temporal). Compared to the control group, the high myopic group had a significantly increase for CR, while LT, perifoveal ChT (except nasal), parafoveal RT, perifoveal RT, and pRNFL (except temporal) had significant decreased. Conclusion The changes of ocular biometric parameters in children and adolescents are closely related to refractive errors. Ocular biometric parameters devices, as effective non-invasive techniques, provide objective biological markers for monitoring refractive errors such as myopia.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 2
·707-717
·
IF 4.5
Sui Yudong,Yuan Yanru,Tan Pan,Jiang Yehua,Han Lina
This paper presents the experimental investigation of the effect of Nb 2 O 5 content on the phase composition, microstructure, and physical and mechanical performance of the zirconia-toughened alumina (ZTA) ceramics, aimed to optimize the additional amount of Nb 2 O 5 , refine the ceramic grains, and improve the densification, hardness and fracture toughness. ZTA ceramics with various Nb 2 O 5 contents were prepared using the spark plasma sintering method. The addition of trace amounts of Nb 2 O 5 did not produce a new Nb-rich phase; the Nb atoms were dissolved in the ZrO 2 grains. The addition of trace amounts of Nb 2 O 5 led to grain refinement and an increase in density, but the addition of excessive Nb 2 O 5 resulted in grain growth and a decrease in relative density. Furthermore, the addition of Nb 2 O 5 promoted uniformity of the microstructure. The sample with 0.25 wt.% Nb 2 O 5 had the maximum Vickers hardness and indentation fracture toughness, which were 1228.40 HV and 9.17 MPa √m, respectively. Mechanical properties of the composite mainly depended on the grain size, which was influenced to some extent by the relative density.
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