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  • 1.

    【2hr】Novel Amino-pillar[5]arene as a Fluorescent Probefor Highly Selective Detection of Au3+ Ions

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    机译 新型氨基柱[5]芳烃作为荧光探针用于高选择性检测Au3 +离子
    摘要：A novel fluorescent probe, amino-pillar[5]arene (APA), was prepared via a green, effective, and convenient synthetic method, which was characterized by nuclear magnetic resonance (NMR), infrared (IR), and high-resolution mass spectrometry. The fluorescence sensing behavior of the APA probe toward 22 metal ions in aqueous solutions were studied by fluorescence spectroscopy. The results showed that APA could be used as a selective fluorescent probe for the specificity detection of Au3+ ions. Moreover, the detection characteristics were investigated by fluorescence spectral titration, pH effect, fluorescence competitive experiments, Job’s plot analysis, 1H NMR, and IR. The results indicated that detection of Au3+ ions by the APA probe could be achieved in the range of pH 1–13.5 and that other coexisting metal ions did not cause any marked interference. The titration analysis results indicated that the fluorescence intensity decreased as the concentration of Au3+ ions increased, with an excellent correlation (R2 = 0.9942). The detection limit was as low as 7.59 × 10–8 mol·L–1, and the binding ratio of the APAprobe with Au3+ ions was 2:1. Therefore, the APA probehas potential applications for detecting Au3+ ions in theenvironment and in living organisms.
  • 2.

    【2hr】Understanding Mechanism of Adsorptionin the Decolorization of Aqueous Methyl Violet (6B) Solution by OkraPolysaccharides: Experiment and Theory

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    机译 了解吸附机理黄秋葵对甲基紫（6B）水溶液的脱色多糖：实验与理论
    摘要：Optimal conditions for ultrasonic-assisted extraction of polysaccharide from Chinese okra were found using response surface methodology. The okra polysaccharide (OPS) was used for the adsorption of methyl violet 6B (MV). Conditions for maximal adsorption efficiency of MV were established. The mechanism of MV adsorption was investigated by the characterization and physicochemical analysis of OPS before and after the adsorption of MV. Both infrared (IR) analysis and molecular dynamics (MD) simulation suggest that MV adsorption by OPS was an electrostatic interaction between MV and oxygen-containing groups of OPS. Further, the results of first-principles calculation were in agreement with IR spectroscopy measurements and MD simulation, which were all consistent with the suggested adsorption mechanism. Optimization of okra extraction conditions, maximized efficiency of MV adsorption by OPS, and the understanding of the adsorption mechanism are the highlights of this work, providing a reference for promising applications of OPS in the treatment of wastewater in textile, paper, and other industries.
  • 3.

    【2hr】Catalytic Preparation of 1-Aryl-Substituted1,2,4-Triazolium Salts

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    机译 1-芳基取代的催化制备1,2,4-三唑盐
    摘要：1,4-Diaryl- and 1-aryl-4-alkyl-substituted 1,2,4-triazolium salts are convenient air-stable precursors to carbenes used both as organocatalysts or as ligands for transition metal complexes. Traditionally, they are prepared via a multistep synthetic pathway with the low-yielding formation of the triazolium ring occurring in the last step. We have developed an alternative two-step synthesis involving the conversion of a primary amine or aniline derivative to the corresponding 4-substituted triazole followed by a copper-catalyzed arylation with diaryliodonium salts. This transition metal-catalyzed arylation can be carried out under mild conditions in acetonitrile and is tolerant toward both water and oxygen. Additionally, the high functional group tolerance of the protocol described here gives easy access to triazolium salts containing heterocyclic substituents or sulfides.
  • 4.

    【2hr】Continuous Mesoporous Aluminum Oxide Film with PerpendicularlyOriented Mesopore Channels

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    机译 垂直连续介孔氧化铝膜定向的中孔通道
    摘要：Mesoporous aluminum oxide (MAO) films with perpendicularly oriented cylindrical mesopores (pore diameter: ca. 10 nm) were successfully deposited on a glass substrate by a surfactant-templating approach using aluminum nitrate as an aluminum source. The perpendicular orientation of mesopores was confirmed by grazing-incidence small-angle X-ray scattering and neutron reflection experiments. The thickness of the MAO film was around 100 nm, with a surface roughness of less than 6 nm. Since the inner surface of MAO pores was positively charged, negatively charged glucose oxidase molecules could be densely loaded into the cylindrical mesopores without significant loss of enzymatic activity. The present MAO film is potentially useful as an inorganic host material for an enzyme toward the development of a biocatalytic system.
  • 5.

    【2hr】Preparation and Characterization of Cationic Water-SolublePillar[5]arene-Modified Zeolite for Adsorption of Methyl Orange

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    机译 阳离子水溶性的制备与表征柱[5]芳烃改性沸石吸附甲基橙
    摘要：A novel quaternary cationic pillar[5]arene-modified zeolite (WPA5/zeolite) was prepared via charge interaction between the cationic WPA5 and natural zeolite and characterized by scanning electron microscopy (SEM), Fourier transform infrared absorption spectroscopy, X-ray diffraction, solid-state nuclear magnetic resonance, and thermogravimetric (TG) analysis. The effects of zeolite particle size, WPA5 concentration, adsorption time, initial concentration, and pH on the removal of methyl orange (MO) were studied. The SEM and XRD results revealed a strong interaction between WPA5 and natural zeolite, and the modified composites showed novel microscopic morphology and structural properties. TG analysis indicated excellent thermal stability of the composite. MO was removed via electrostatic adsorption, and the removal efficiency was 84% at an initial concentration of 100 mg/L. Increase in the initial dye concentration enhanced the adsorption capacity of WPA5/zeolite and decreased the removal of MO. Based on the adsorption kinetics, the pseudo-second-order model (R2 = 0.998)described the kinetic behavior of MO on WPA5/zeolite. In addition,UV and fluorescence spectra revealed that MO and WPA5 are complexedby a 1:1 complex ratio, and the binding constant between them was12 595 L·mol–1. NMR and molecular dockingalso verified their interaction. Therefore, the potential applicationof the prepared composite includes removal of organic anionic dyes.
  • 6.

    【2hr】Devulcanization of Waste Rubber and Generation ofActive Sites for Silica Reinforcement

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    机译 废橡胶的脱硫和生成二氧化硅增强的活性部位
    摘要：Each year, hundreds of millions of tires are produced and ultimately disposed into nature. To address this serious environmental issue, devulcanization could be one of the sustainable solutions that still remains as one of the biggest challenges across the globe. In this work, sulfur-vulcanized natural rubber (NR) is mechanochemically devulcanized utilizing a silane-based tetrasulfide as a devulcanizing agent, and subsequently, silica (SiO2)-based rubber composites are prepared. This method not only breaks the sulfur–sulfur cross-links but also produces reactive poly(isoprene) chains to interact with silica. The silica natural rubber composites are prepared by replacing 30% fresh NR by devulcanized NR with varying contents of silica. The composites exhibit excellent mechanical properties, tear strength, abrasion resistance, and dynamic mechanical properties as compared with the fresh natural rubber silica composites. The tensile strength of devulcanized rubber-based silica composites is ∼20 MPa, and the maximum elongation strain is ∼921%. The devulcanizedcomposites are studied in detail by chemical, mechanical, and morphologicalanalyses. Thus, the value added by the devulcanized rubber could attractthe attention of recycling community for its sustainable applications.
  • 7.

    【2hr】Hierarchical Laser-Patterned Silver/Graphene OxideHybrid SERS Sensor for Explosive Detection

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    机译 分层激光图案化的银/氧化石墨烯用于爆炸检测的混合式SERS传感器
    摘要：We demonstrate an ultrafast laser-ablated hierarchically patterned silver nanoparticle/graphene oxide (AgNP/GO) hybrid surface-enhanced Raman scattering (SERS) substrate for highly sensitive and reproducible detection of an explosive marker 2,4-dinitrotoluene (2,4-DNT). A hierarchical laser-patterned silver sheet (Ag–S) is achieved by ultrafast laser ablation in air with pulse energies of 25, 50, and 100 μJ. Multiple laser pulses at a wavelength of 800 nm and a pulse repetition rate of 50 fs at 1 kHz are directly focused on Ag–S to produce and deposit AgNPs onto Ag–S. The surface morphology of ablated Ag–S was evaluated using atomic force microscopy, optical profilometry, and field emission scanning electron microscopy (FESEM). A rapid increase in the ablation rate with increasing laser energy was observed. Selected area Raman mapping is performed to understand the intensity and size distribution of AgNPs on Ag–S. Further, GO was spin-coated onto the AgNPs produced by ultrafast ablation on Ag–S. The hierarchical laser-patterned AgNP/GO hybrid structure was characterizedusing FESEM, high-resolution transmission electron microscopy, X-raydiffraction, Fourier transform infrared spectroscopy, and Raman spectroscopy.Further, hierarchical laser-patterned AgNP/GO hybrid structures havebeen utilized as SERS-active substrates for the selective detectionof 2,4-DNT, an explosive marker. The developed SERS-active sensorshows good stability and high sensitivity up to picomolar (pM) concentrationrange with a Raman intensity enhancement of ∼1010 for 2,4-DNT. The realized enhancement of SERS intensity is due tothe cumulative effect of GO coated on Ag–S as a proactive layerand AgNPs produced by ultrafast ablation.
  • 8.

    【2hr】Deciphering Structures of Inclusion Complexes of Amylosewith Natural Phenolic Amphiphiles

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    机译 直链淀粉包合物的破译结构与天然酚类两亲物
    摘要：Amylose inclusion complexes were prepared in aqueous solution with the amphiphilic moiety 3-pentadecylphenol via a direct mixing method. Attenuated total reflection Fourier transform infrared spectroscopy as well as differential scanning calorimetry confirmed the formation of amylose inclusion complexes. The morphology of the synthesized complexes is sensitive to temperature, and X-ray data revealed that the inclusion complexes exhibited distinct structures at different temperatures. Small-angle X-ray scattering data indicated ordered lamellar structures of the synthesized complexes at room temperature, and wide-angle X-ray scattering profiles showed the transformation of the crystalline structure as a function of the temperature. The results of this research will help to understand the relationship between the inclusion complex structures with temperature.
  • 9.

    【2hr】Solvent Effect on the Solvothermal Synthesis of MesoporousNiO Catalysts for Activation of Peroxymonosulfate to Degrade OrganicDyes

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    机译 溶剂对介孔溶剂热合成的影响用于过氧化一硫酸盐活化降解有机物的NiO催化剂染料类
    摘要：In this work, we successfully prepared three different mesoporous NiO nanostructures with preferential (111) planes using three different solvents–water, a water–ethanol mixture, and a water–ethylene glycol mixture. The NiO nanosheets prepared from the water–ethylene glycol mixture and denoted as NiO-EG showed a nanosheet morphology thinner than 10 nm, whereas the water–ethanol and water samples were 30–40 nm and above 100 nm thick, respectively. The NiO-EG catalyst was found to exhibit a high catalyzing ability to activate peroxymonosulfate (PMS) for decoloring dyes, by which 94.4% of acid orange 7 (AO7) was degraded under the following reaction conditions: AO7 = 50 mg/L, catalyst = 0.2 g/L, PMS = 0.8 g/L, pH = 7, and 30 min reaction time. The dye degradation rate was investigated as a function of the catalyst dosage, pH, and dye concentration. According to quenching experiments, it was found that SO4•–, HO•, and O2•– were the dominant radicals for AO7 degradation, and oxygen vacancies played a significant role in the generation of radicals. High surface area, thin flaky structure, rich oxygen vacancies, fast charge transport,and low diffusion impedance all enhanced the catalytic activity ofNiO-EG, which exhibited the highest degradation ability due to itsabundant accessible active sites for both adsorption and catalysis.
  • 10.

    【2hr】Thermoelectric Performance of Two-DimensionalAlX (X = S, Se, Te): A First-Principles-Based Transport Study

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    机译 二维热电性能AlX（X = S，Se，Te）：基于第一性原理的运输研究
    摘要：By using the first-principles calculations in combination with the Boltzmann transport theory, we systematically study the thermoelectric properties of AlX (X = S, Se, Te) monolayers as indirect gap semiconductors. The unique electronic density of states, which consists of a rather sharp peak at the valence band maxima and an almost constant band at the conduction band minima, makes AlX (X = S, Se, Te) monolayers excellent thermoelectric materials. The optimized power factors at room temperature are 22.59, 62.59, and 6.79 mW m–1 K–2 under reasonable electronic concentration for AlS, AlSe, and AlTe monolayers, respectively. The figure of merit (zT) increases with temperature and the optimized zT values of 0.52, 0.59, and 0.26 at room temperature are achieved under moderate electronic concentration for AlS, AlSe, and AlTe monolayers, respectively, indicating that two-dimensional layered AlX (X = S, Se, Te) semiconductors, especially AlSe, can be potential candidate matrices for high-performance thermoelectric nanocomposites.
  • 11.

    【2hr】Compatibilization Behavior of Double Spherical TETA–SiO2@PDVB Janus Particles Anchored at the Phase Interface of AcrylicResin/Epoxy Resin (AR/EP) Polymer Blends

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    机译 固定在丙烯酸相界面上的双球形TETA-SiO2 @ PDVB Janus颗粒的相容行为树脂/环氧树脂（AR / EP）聚合物共混物
    摘要：The inorganic particles used as a compatibilizer play a role in crack termination and heat resistance. However, the poor compatibility of inorganic particles and polymer hinders their application. Herein, the double spherical SiO2@PDVB Janus particles (JPs) were modified with triethylenetetramine (TETA), and the obtained anisotropic TETA–SiO2@PDVB JPs were used as the compatibilizer of acrylic resin/epoxy resin (AR/EP) composites. The modification and the compatibilization of TETA–SiO2@PDVB JPs were studied by scanning electron microscopy, X-ray photoelectron spectroscopy, differential scanning calorimetry, and dynamic mechanical analyzer, impact test, tensile test, and so forth. Results show that amino groups grafted onto the SiO2 lobe can react with epoxy groups of EP, which results in the TETA–SiO2 lobe being embedded in the EP phase and the PDVB lobe being pushed toward the AR phase. The TETA–SiO2@PDVB JPs anchored at the interface of AR and EP increase their interfacial adhesion, decrease the domain phase size and distribution of dispersed AR, andimprove the compatibility of AR/EP composites. The compatibilizationof nanoparticles (NPs) is realized by the cavitation and bluntingof different scaled AR phase domain distributions and that of JPsis realized by the strong interfacial force originated by JPs. Moreover,the desorption energy of TETA–SiO2@PDVB JPs is higherthan that of SiO2–TETA; so the glass transitiontemperature (Tg) of AR/EP/JP compositesis higher than that of AR/EP/NP composites. The strong interfacialadhesion and high desorption energy endow TETA–SiO2@PDVB JPs with a toughening effect and enhancing effect. The impactstrength and the tensile strength of AR/EP/TETA–SiO2@PDVB composites are 16.03 kJ/m2 and 63.12 MPa, whichare 9.91 kJ/m2 and 16.32 MPa higher than those of AR/EPcomposites, respectively. JPs used in the thermosetting EP is benefitto its toughening study and the new anisotropic Janus compatibilizer.
  • 12.

    【2hr】A Proposal for the Mechanismof the CH + CO2 Reaction

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    机译 该机制的提案CH + CO2反应的反应
    摘要：Few experimental studies on the CH + CO2 global reaction propose H, CO, and HCO as major products. However, the reaction mechanisms behind this process have not yet been elucidated. Moreover, some intriguing kinetic particularities were noticed in these previous investigations. The advanced theoretical study performed here shows that a CH insertion mechanism is capable of explaining all the experimental data available. Hence, the strong deviations from a traditional Arrhenius behavior ascribed to the rate-determining elementary reaction (the CH insertion step) account for the kinetic particularities observed experimentally. A change in the preferred product channel as temperatures increase (from HCO + CO to H + 2CO) is also predicted to occur due to the HCO decomposition, although the CH depletion rates in typical conditions are not affected by this additional step.
  • 13.

    【2hr】Montmorillonites Can Tightly Bind Glyphosate and ParaquatReducing Toxin Exposures and Toxicity

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    机译 蒙脱石可以紧密结合草甘膦和百草枯减少毒素暴露和毒性
    摘要：Among the numerous contaminants of soil, glyphosate and paraquat are two of the most widely used herbicides that are commonly detected in the environment. Soil and sediment contaminated with glyphosate, paraquat, and other environmental toxins can be mobilized and redistributed to lawns, vegetable gardens, parks, and water supplies in vulnerable communities at the site of disasters such as hurricanes and flooding. Glyphosate and paraquat bind strongly to soils containing clays, making their bioavailability (bioaccessibility) from these types of soil very low. Because of their affinity for clay-based soils, it is possible that montmorillonite clays could be administered as a therapeutic agent in the diet of animals and humans to decrease short-term exposure and toxicity. In this study, we investigated the sorption mechanisms of glyphosate and paraquat onto active surfaces of calcium montmorillonite (CM) and sodium montmorillonite (SM) clays and derived binding parameters, including capacity, affinity, and enthalpy. Additionally, we used these parameters to predict the reduction in bioavailability underdifferent pH and temperature conditions and to estimate the theoreticaldose of clay that could protect against severe paraquat toxicity andlethality. Computational modeling and simulation studies depictedtoxin sorption mechanisms at different pH values. Additionally, atoxin-sensitive living organism (Hydra vulgaris) was used to confirm the safety of the clay and its ability to protectagainst toxicity from glyphosate and paraquat. The high efficacy ofCM and SM shown in this study supports the natural binding activityof glyphosate and paraquat to clay-based soils. Following disastersand medical emergencies, montmorillonite clays could be administeredby capsules and tablets, or added to food and flavored water, to reducetoxin bioavailability and human and animal exposures.
  • 14.

    【2hr】Polyamine-Modified Gold Nanoparticles Readily Adsorbon Cell Membranes for Bioimaging

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    机译 聚胺修饰的金纳米颗粒易于吸附生物成像的细胞膜研究
    摘要：The surface modification of nanoparticles (NPs) can enhance cellular and intracellular targeting. A new type of polyamine-modified gold NPs (AuNPs) are designed and synthesized, which can be selectively absorbed onto the cell membrane. AuNPs with an average diameter of 4.0 nm were prepared and modified with polyamine (R-4C) through amidation. In order to detect the distribution of NPs within cells by fluorescence imaging, AuNP@MPA-R-4C was functionalized with fluorescein isothiocyanate (FITC). The fluorescence-labled NPs AuNP@MPA-R-4C-FITC demonstrated minimal cytotoxicity in several cell lines. Both confocal laser scanning microscopy and transmission electron microscopy demonstrated that AuNP@MPA-R-4C-FITC was distributed on the cell membrane. Compared with the free organic dye, the modified AuNPs showed significantly increased accumulation on the cell membrane after treatment for only 10 min. These results suggested that AuNP@MPA-R-4C-FITC can be used as a bioprobe targeting the cell membrane for various biological applications.
  • 15.

    【2hr】Aza-Annulation of 1,2,3,4-Tetrahydro-β-carbolineDerived Enaminones and Nitroenamines: Synthesis of FunctionalizedIndolizino[8,7-b]indoles, Pyrido[1,2-a:3,4-b′]diindoles, Indolo[2,3-a]quinolizidine-4-ones and Other Tetrahydro-β-carbolineFused Heterocycles

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    机译 1,2,3,4-四氢-β-咔啉的氮杂环化衍生的烯胺和亚硝胺：官能化的合成吲哚并[8,7-b]吲哚，吡啶并[1,2-a：3,4-b']二吲哚，吲哚并[2,3-a]喹唑烷-4-酮和其他四氢-β-咔啉熔融杂环
    摘要：Aza-annulation of novel 1,2,3,4-tetrahydro-β-carboline derived enaminones and nitroenamines with various 1,2- and 1,3-bis electrophiles, such as oxalyl chloride, maleic anhydride, 1,4-benzoquinone, 3-bromopropionyl chloride, itaconic anhydride, and imines (from formaldehyde and primary amines), has been investigated. These methodologies provide simple one-step pathways for efficient construction of highly functionalized tetrahydro-β-carboline 1,2-fused, five- and six-membered heterocyclic frameworks, such as indolizino[8,7-b]indoles, pyrido[1,2-a:3,4-b′]diindoles, indolo[2,3-a]quinolizidines, and pyrimido[1′,6′:1,2]pyrido[3,4-b]indoles, which are core structures of many naturally occurring indole alkaloids with diverse bioactivity.
  • 16.

    【2hr】Facile Synthesis of Quaternary Structurally OrderedL12-Pt(Fe, Co, Ni)3 Nanoparticles withLow Content of Platinum as Efficient Oxygen Reduction Reaction Electrocatalysts

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    机译 四元结构序的简便合成L12-Pt（Fe，Co，Ni）3纳米粒子具有低含量的铂作为高效氧还原反应电催化剂
    摘要：Synthesis of electrocatalysts for oxygen reduction reaction (ORR) with not only prominent electrocatalytic performance but also a low amount of Pt is the urgent challenge in the popularization of fuel cells. In this work, through a facile synthetic strategy of spray dehydration on a solid surface and annealing process, we demonstrate the first manufacture of quaternary structurally ordered PtM3 (M = transition metal) intermetallic nanoparticles (NPs), Pt(Fe, Co, Ni)3, in order to lower the content of Pt. The atomic contents of Pt, Fe, Co, and Ni are equal and the chemical structure of Pt(Fe, Co, Ni)3 is a cubic L12-ordered structure. L12-Pt(Fe, Co, Ni)3/C electrocatalysts exhibit enhanced electrocatalytic performance toward ORR with mass activity (MA) 6.6 times higher than the commercial Pt/C and a minimal loss of 17% in MA and 1.5% loss in specific activity (SA) after 10 000 potential cycles at 0.9 V. Furthermore, the stability behavior is confirmed to be attributed to the coaction of particle sizes and the ordering effect. Compared with traditional Pt-based electrocatalystsin the stoichiometric forms of Pt3M and PtM, L12-Pt(Fe, Co, Ni)3 intermetallic NPs exhibit excellent performanceand higher cost effectiveness. Moreover, this work also proposes afacile and effective synthetic strategy for manufacturing multicomponentPt-based electrocatalysts for ORR.
  • 17.

    【2hr】Novel Nitrogen–Phosphorus Flame Retardant Basedon Phosphonamidate: Thermal Stability and Flame Retardancy

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    机译 基于新型氮磷阻燃剂膦酰胺酸盐的研究：热稳定性和阻燃性
    摘要：A novel nitrogen–phosphorus flame retardant (P–N FR) based on phosphonamidate, dimethyl N,N′-1,3-phenylenebis(P-methylphosphonamidate) (DMPMP), was successfully synthesized and its flame-retarding performances and thermal degradation were compared with those of other P–N FRs and a phosphorus-based FR such as resorcinol bis(diphenyl phosphate) (RDP). DMPMP was applied to acrylonitrile–butadiene–styrene (ABS) and ethylene–vinyl acetate (EVA) to investigate the factors governing the flame-retarding behaviors of P–N FRs which would make them efficient for noncharrable polymers. V-0 ratings were achieved at 20 wt % loading of DMPMP for ABS and at a much lesser amount of DMPMP loading (10 wt %) for EVA. Meanwhile, no rating and V-2 were achieved even at 20–30 wt % loading of other P–N FRs or RDP for ABS and EVA, respectively. The results from thermogravimetric analysis, Fourier transform infrared, and UL-94V indicated that DMPMP is a highly efficient FR and acts mainly in a gas-phase flame-retarding mode of action. The condensed phase of DMPMP also contributed to theflame retardancy property through −NH– groups whichtendentiously generate a nitrogen–phosphorus-rich residue becauseof the intermolecular coupling transesterification reaction. Theseresults demonstrated the assumption that DMPMP has a high P contentand good hydrostability, which exhibits good flame retardancy fornoncharrable polymers such as ABS and EVA.
  • 18.

    【2hr】Molecular Understanding of Solvents and GlyciteinInteraction during Extraction

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    机译 溶剂和糖精蛋白的分子理解提取过程中的相互作用
    摘要：Hydrogen bonding interaction plays a crucial role in liquid systems. Methanol, ethanol, and acetone are the most commonly used solvents to extract isoflavones from soybeans. The structural and electronic properties of the molecular clusters of naturally occurring glycitein with solvents were investigated using the density functional theory method employing the B3LYP-D3/cc-pVTZ approach. The influence of the solvent was carried out by using the polarized continuum model (PCM). The geometry optimization, vibrational frequencies, and topological parameters have been assessed at the same level of theory. From the molecular structure and thermodynamic point of view, the most stable structures are formed by the interaction between the carbonyl group of glycitein and MeOH or EtOH. For acetone–glycitein, the strongest interaction is formed by the interaction of the hydroxyl group of glycitein with the carbonyl group of acetone. All the hydrogen bonds in the MeOH/EtOH/acetone–glycitein complexes are closed-shell interactions. This study can help increase the efficiency of extraction.
  • 19.

    【2hr】Simultaneous Detection of Morphine and Codeine inthe Presence of Ascorbic Acid and Uric Acid and in Human Plasma atNafion Single-Walled Carbon Nanotube Thin-Film Electrode

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    机译 同时检测吗啡和可待因在室温下抗坏血酸和尿酸的存在以及人体血浆中Nafion单壁碳纳米管薄膜电极
    摘要：In clinical settings, the dosing and differential diagnosis of the poisoning of morphine (MO) and codeine (CO) is challenging due to interindividual variations in metabolism. However, direct electrochemical detection of these analytes from biological matrices is inherently challenging due to interference from large concentrations of anions, such as ascorbic acid (AA) and uric acid (UA), as well as fouling of the electrode by proteins. In this work, a disposable Nafion-coated single-walled carbon nanotube network (SWCNT) electrode was developed. We show facile electron transfer and efficient charge separation between the interfering anions and positively charged MO and CO, as well as significantly reduced matrix effect in human plasma. The Nafion coating alters the voltammetric response of MO and CO, enabling simultaneous detection. With this SWCNT/Nafion electrode, two linear ranges of 0.05–1 and 1–10 μM were found for MO and one linear range of 0.1–50 μM for CO. Moreover, the selective and simultaneous detection of MO and CO was achieved in large excess ofAA and UA, as well as, for the first time, in unprocessed human plasma.The favorable properties of this electrode enabled measurements inplasma with only mild dilution and without the precipitation of proteins.
  • 20.

    【2hr】Suppression of Photoinduced Surface Oxidation of VanadiumDioxide Nanostructures by Blocking Oxygen Adsorption

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    机译 钒的光诱导表面氧化的抑制通过阻止氧气吸附来形成二氧化钛纳米结构
    摘要：Controlling the surface is necessary to adjust the essential properties and desired functions of nanomaterials and devices. For nanostructured multivalent vanadium oxides, unwanted surface oxidation occurs at ambient atmosphere generally and needs to be suppressed or avoided. We describe the suppressed surface oxidation of VO2 nanostructures through blocking oxygen adsorption. During an enhanced photoinduced surface oxidation process, the increased oxidation states of vanadium in VO2 nanostructures are suppressed by the use of an inert atmosphere or coating. Intermediate oxidation states are observed, and an ALD-TiO2 coating has a good antioxidant capacity for preventing the formation of oxygen-enriched components. Such oxidation suppression is beneficial to improving the stability of VO2 nanostructures. Controllable surface oxidation helps us to understand the physical essentials of surface chemical reactions and achieve better control of surface functions and performances on correlated vanadium oxide nanostructures.
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