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1. QCM biosensor for detection of small nucleic acid fragments: sandwich reaction and signal amplification by silver nanoclusters | |||
GUO Jia,JIANG Qifa,Rui-Qin Fang | |||
Chemistry 24 September 2021 | |||
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Abstract:This article presents a quartz crystal microbalance (QCM) biosensor for the determination of nucleic acids by modifying electrodes with cysteine (Cys), polyethylene glycol (PEG), and silver nanoclusters (AgNCs), which represents a new approach with increased specificity and sensitivity of detection. The probe deoxyribonucleic acid immobilized on the surface of the QCM gold electrode hybridizes with a cysteine conjugate to form a specific recognition layer. The unmodified sites are then non-specifically closed by polyethylene glycol. The target gene is subsequently captured by the immobilized probe, resulting in a change in frequency. The addition of silver ions with reducing agents in an ammonia environment to form silver nanoclusters of DNA-AgNCS was used to further extend the sensitivity of the QCM sensor. The results show that it is possible to expand the frequency variation of the QCM sensor by a factor of 63.6 using such a method. A linear relationship between frequency change and DNA concentration was observed in the range of 1 nM to 10 M of target gene concentration. Thus, this biosensor provides a low-cost and sensitive tool for detecting DNA. | |||
TO cite this article:GUO Jia,JIANG Qifa,Rui-Qin Fang. QCM biosensor for detection of small nucleic acid fragments: sandwich reaction and signal amplification by silver nanoclusters[OL].[24 September 2021] http://en.paper.edu.cn/en_releasepaper/content/4755569 |
2. Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials | |||
LI Weining,ZOU Xuefeng,XIANG Bin | |||
Chemistry 16 April 2021 | |||
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Abstract:The performance of the material is closely related to its morphology and composition. In this research, we used halogen anions to control the solvothermal process to synthesize a series of halogen hydroxy nickel and studied their electrochemical performance. We find that halogen anions have a huge impact on morphology, composition and performance of the product. Specially, Ni(OH)Cl is a micro-flower with a large specific surface area composed of ultra-thin nano-sheets. In the three-electrode system, the Ni(OH)Cl electrode exhibits higher specific capacity (142 mAh g-1 at the current densities of 1 A g-1) than other electrodes due to its special morphology and structure. When assembled an asymmetric supercapacitor (Ni(OH)Cl//rGO ASC) by employing nickel hydroxychloride, rGO and 2M KOH aqueous solution as the positive electrode, the negative electrode, and the electrolyte, respectively. The device demonstrated a high energy density of 66 Wh kg?1 at a power density of 800W kg?1 and maintained at an energy density of 35.4 Wh kg?1 even with a high power density of 8000 W kg?1. This research will provide a new idea for controlling the morphology and composition of materials. | |||
TO cite this article:LI Weining,ZOU Xuefeng,XIANG Bin. Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials[OL].[16 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754602 |
3. Interface-driven synthesis of CuO@CN LDH on copper foam for high-performance supercapacitors | |||
SONG Tingting,ZOU Xuefeng,XIANG Bin | |||
Chemistry 11 April 2021 | |||
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Abstract:Under the condition of not using a binder, the active material can be directly grown on the conductive base material as the electrode of the capacitor. The internal space structure of this electrode material makes the ion transport area easy to diffuse and brings more active sites, which leads to its excellent electrical conductivity and the formation of a prominent conductive network. However, the adhesion between the active material and the substrate is weak and even easy to fall off, resulting in poor cycling performance of the capacitor To solve this problem, we provide a novel strategy. The Co-Ni double hydroxide core-shell structure was gradually formed by the pre-oxidation of copper foam, an interface-modulated copper foam framework surface, re-oxidation and electrodeposition. Furthermore,it was founded that the adhesive force of CuO grown free-standing on copper foam is enhanced in this way. The specific capacity of the prepared core-shell nanohybrid (POCF@CuO@CN LDH) by the two-step oxidation method was 4027.28 F g-1 at 1 A g-1, and that of the core-shell nanohybrid (OCF@CuO@CN LDH) prepared by the direct oxidation method was 2377.50 F g-1 at 1 A g-1. The former is 1.7 times than the latter. The POCF@CuO@CN LDH electrode has a capacitance retention rate of 80.84 % after 10000 cycles at 20 A g-1 with excellent multiplicity performance and long cycle stability. The as-assembled POCF@CuO@CN LDH//RGO asymmetric supercapacitor (ASC) provides a excellent energy density of 41.73 Wh kg-1 at a power density of 800.13 W kg-1 and a capacitance retention rate of 73.17 % after 10000 cycles at 5 A g-1. In addition, a commercial 1W light-emitting diode indicator with blue light can be energized for 4 minutes when two ultra-capacitor devices connected in series are linked in series. As such, it can be suggested that the two-step oxidation method, which provides a strategy for the integration of nanocomposite materials and substrates with strong interfacial adhesion, may have great potential in high-performance electrochemical devices. | |||
TO cite this article:SONG Tingting,ZOU Xuefeng,XIANG Bin. Interface-driven synthesis of CuO@CN LDH on copper foam for high-performance supercapacitors[OL].[11 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754601 |
4. Simultaneous determination of concentration and enantiomeric excess of amino acids with a coumarin-derived achiral probe | |||
YANG Lamei,WEI Weili | |||
Chemistry 24 March 2021 | |||
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Abstract:The chirality of amino acids plays important role in biological and medical sciences. The development of achiral small-molecule probes that can simultaneously determine the absolute configuration, enantiomeric excess, and total concentration of amino acids is significant. The current available achiral coumarin aldehyde probe that could form Schiff bases with free amino acids at room temperature to induce the CD signals and to change UV-vis signals. The red-shifted UV-vis signals were independent of the substrate\'s chirality and could be used to determine the total concentration. Conversely, the enantioselective CD signals could be used to determine the absolute configuration and enantiomeric excess. The usefulness and practicability of this sensing method were demonstrated by analyzing 6 non-racemic phenylalanine samples with different enantiomeric compositions and concentrations. | |||
TO cite this article:YANG Lamei,WEI Weili. Simultaneous determination of concentration and enantiomeric excess of amino acids with a coumarin-derived achiral probe[OL].[24 March 2021] http://en.paper.edu.cn/en_releasepaper/content/4754323 |
5. Mechanism Study of Iron(Ⅲ)-Porphyrin Catalyzed Cycloproanation of Aromatic Alkene with Trifluoroethylamine Hydrochloride | |||
Xiao Jiang,Liu Qiang | |||
Chemistry 31 May 2020 | |||
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Abstract:A substrate scopes of cyclopropanation has been expanded with trifluoroethylamine hydrochloride catalyzed by TPFPPFeCl under a user-friendly condition. Trifluoromethyl-substituted cyclopropanes were generated with high diastereoselectivity and yield, employing styrene derivatives and other heterocyclic alkene as substrates. Moreover, mechanism study shows TPFPP(NO) is the most important reaction intermediate which has not been reported in other metalloporphyrin-catalyzed cyclopropanation reactions. | |||
TO cite this article:Xiao Jiang,Liu Qiang. Mechanism Study of Iron(Ⅲ)-Porphyrin Catalyzed Cycloproanation of Aromatic Alkene with Trifluoroethylamine Hydrochloride[OL].[31 May 2020] http://en.paper.edu.cn/en_releasepaper/content/4752267 |
6. Modulating Prussian Blue Analogues-derived Binary Metal Oxides for Efficient Oxygen Evolution Catalysts | |||
XIAO Shenghuan,YANG Yang,ZHANG Yunhuai | |||
Chemistry 18 May 2020 | |||
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Abstract:Oxygen evolution reaction (OER) is closely related to numerous energy-related applications so that developing high-activity, durable and cost-effective electrocatalysts for OER has been an inevitable trend. Prussian blue analogues (PBAs), a kind of metal organic frameworks (MOFs), which have been paid more attention in the filed of electrocatalysis because of unique framework structure and adjustable components. Herein, we synthesis a series of Ni-Co PBAs via modulating metal ratio by a coprecipitation method and then anneal the as-prepared Ni-Co PBAs, which used as OER catalysts. We found that as the increasing of nickel content, the size of catalysts decreases, which resulting in an increasing of specific surface area and electrochemical active sites, thereby improving the performance of OER. Furthermore, benefiting from the minimum size with largest specific area, largest electrochemical active surface area with different and abundant active sites, the Ni-Co-31 oxides shows a small overpotential of 340 mV at a current density of 10 mAocm-2, a small Tafel slope of 89 mVodec-1, which is superior to other catalysts prepared. This work proves the great significance of PBAs derivatives with different metal ratios for OER performance, which is meaningful for the preparation and mass production of efficient electrocatalysts. | |||
TO cite this article:XIAO Shenghuan,YANG Yang,ZHANG Yunhuai. Modulating Prussian Blue Analogues-derived Binary Metal Oxides for Efficient Oxygen Evolution Catalysts[OL].[18 May 2020] http://en.paper.edu.cn/en_releasepaper/content/4752128 |
7. A Novel Gold (I) Complex of 1,3-Bis(diphenylphosphino)propane: Synthesis, Crystal Structure and C-H...Au Interaction | |||
YANG Xian,HU Kai,WANG Hao,YUAN Haokun,FANG Ruiqin | |||
Chemistry 29 September 2019 | |||
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Abstract:A new diphosphine gold (I) complex [Au2(Ph2PCH2CH2CH2PPh2)(CHCPhOMe)2] (compound 1) containing organophosphine and alkyne ligands has been designed and synthesized. The Au(I) ion is coordinated by P atom from 1,3-bis(diphenylphosphanyl)propane and alkynyl from 1-ethynyl-4-methoxybenzene. The molecular structure of compound 1 has been determined by single crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic space group C2/c with lattice contents a=26.5021(5), b=6.83920(10), c=22.6226(5) Å, α=90.00°, β=98.026(2)°, γ=90.00°, V=4060.25(13) Å3, and Z=4. The final R=0.0282 and wR=0.0568 for 3059 observed reflections with I>2σ(I). The most interesting structural feature of compound 1 is the presence of C-H⋅⋅⋅Au interactions involving Au ions in chain motifs, with H⋅⋅⋅Au distance of 3.233 Ǻ, and C-H⋅⋅⋅Au bond angle of 168.2°. | |||
TO cite this article:YANG Xian,HU Kai,WANG Hao, et al. A Novel Gold (I) Complex of 1,3-Bis(diphenylphosphino)propane: Synthesis, Crystal Structure and C-H...Au Interaction[OL].[29 September 2019] http://en.paper.edu.cn/en_releasepaper/content/4749721 |
8. Aptamer-conjugated Nanomaterials for Biological Targets Detection | |||
ZHANG Ge,PENG Cheng,HU Xiaoxiao | |||
Chemistry 28 May 2018 | |||
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Abstract:Aptamers offer unique advantages in terms of wide range of targets, high affinity and specificity, and have been widely used in many fields such as basic research, disease diagnosis, and drug development. Nanomaterials, due to their nanoscale sizes, shapes and structures, exhibit a variety of features such as large specific surface area and new properties of optical, magnetic, thermal and electrical performance. Hence, aptamer-conjugated nanomaterials composed of aptamers and nanomaterials combine both benefits, enabling high-specificity detection of biological targets in complex environments. This review summarizes the characteristics of various highly efficient aptamer-conjugated nanomaterials detection platforms and their advantages in detection of biotargets in recent years, and demonstrates their potential for biological detection and disease diagnosis. | |||
TO cite this article:ZHANG Ge,PENG Cheng,HU Xiaoxiao. Aptamer-conjugated Nanomaterials for Biological Targets Detection[OL].[28 May 2018] http://en.paper.edu.cn/en_releasepaper/content/4745273 |
9. Preparation of thermo-chromic coating and establishment of variable temperature model | |||
Huang Houqiang,He Deliang,Lei Huibin,Hu Jun,Lu Yao | |||
Chemistry 22 May 2018 | |||
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Abstract: 6 reversible thermo-chromic coatings were prepared between thermo-chromic microcapsule and resin such as acrylic resin, silicone resin, respectively. The thermochromic performance and color coordinates (RGB) of the obtained thermochromic coating were evaluated. And models for displaying the relationship between temperatures and coating color coordinates were established using own experiment. Results showed that the correlation coefficient of each temperature model was above 0.9. The temperature measurement errors were about ±1 C after simulated trials of the model, which proved that the feasibility of measure temperature by using the variable temperature model. Also, a contactless method for obtaining specific temperature by thermochromic coating is proposed. | |||
TO cite this article:Huang Houqiang,He Deliang,Lei Huibin, et al. Preparation of thermo-chromic coating and establishment of variable temperature model[OL].[22 May 2018] http://en.paper.edu.cn/en_releasepaper/content/4745170 |
10. Influence of Preparation Condition on the Performance of Ni-based Catalysts for the Glycerol Steam Reforming | |||
XIE Shuang,Zhang Xianghua,Tu Qiang,Shi Biao,Cui Yuehua,Chen Changguo | |||
Chemistry 11 May 2018 | |||
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Abstract:The effect of preparation condition on the performance of Ni-based catalysts was investigated for the glycerol steam reforming. The La0.7Ce0.3NiO3 mixed oxides were synthesized using different solution concentrations and calcination temperatures by co-precipitation method. BET, ICP, XRD, TPR, FE-SEM, CO2-TPD, TGA and Raman spectroscopy were used to characterize the catalysts. Including La2NiO4 phase at lowest solution concentration, catalyst precursor included LaNiO3 phase instead of La2NiO4 at other solution concentrations. At low calcination temperature of 700 C, it was found that smaller particle size of CeO2 incorporated more lanthanum, higher surface basicity and La2O2CO3 phase could effectively inhibit and eliminate coking leading to the better performance of catalyst. | |||
TO cite this article:XIE Shuang,Zhang Xianghua,Tu Qiang, et al. Influence of Preparation Condition on the Performance of Ni-based Catalysts for the Glycerol Steam Reforming[OL].[11 May 2018] http://en.paper.edu.cn/en_releasepaper/content/4745028 |
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