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- 저자 : Xinmei Liu (검색결과 5 건)
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Cu nanoplates with ‘‘clean surface”: Synthesis and their enhanced biosensors performance
Xinmei Liu,Chunyang Yang,Wenlong Yang,Jiaqi Lin,Xue Zhou,Yuhang Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
In this study, we demonstrated a one-pot synthesis of Cu nanoplates (Cu NPs) with high purity and ‘‘cleansurface”. Different from surfactant-assisted method, we tailored the architecture by controlling the ripeningtime of Cu seeds. Citrate is introduced as a structure-directing agent. Since the ‘‘clean surface” providemore available active sites, the as-prepared Cu NPs show a superior performance when utilized in thenon-enzymatic biosensors. In the detection of nitrite, the sensor constructed by Cu NPs exhibited a superiorsensitivity (303.1 ± 10.18 mAmM1cm2), and the detection range is 5.0 mM. On the contrary, sensitivityfor the Cu NPs by surfactant-assisted method is negligible. As applied in the glucose sensors,detection range by Cu NPs could reach 36.0 mM. And the sensitivity under ambient condition (298 K)is 561.93 ± 3.72 mAmM1cm2, which is ca. 2.11-folds higher than that for Cu NPs by surfactantassistedmethod. In the detection of H2O2, detection range is 10.0 mM, and the enhancement factor fordetection range is up to 2.0-folds. The superior performance can also be extended to the catalysis forthe reduction of 4-nitro-phenol. Since no additional noble metals was applied, this strategy would openup a new avenue for utilizing non-noble metals.
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UNIQUENESS RELATED TO HIGHER ORDER DIFFERENCE OPERATORS OF ENTIRE FUNCTIONS
( Xinmei Liu ),( Junfan Chen ) 한국수학교육학회 2023 純粹 및 應用數學 Vol.30 No.1
In this paper, by using the difference analogue of Nevanlinna's theory, the authors study the shared-value problem concerning two higher order difference operators of a transcendental entire function with finite order. The following conclusion is proved: Let f(z) be a finite order transcendental entire function such that λ(f - a(z)) < p(f), where a(z)(∈ S(f)) is an entire function and satisfies p(a(z)) < 1, and let η(∈ ℂ) be a constant such that Δ<sup>n+1</sup><sub>η</sub>f(z) ≢ 0. If Δ<sup>n+1</sup><sub>η</sub>f(z) and Δ<sup>n</sup><sub>η</sub>f(z) share Δ<sup>n</sup><sub>η</sub>a(z) CM, where Δ<sup>n</sup><sub>η</sub>a(z) ∈ S(Δ<sup>n+1</sup><sub>η</sub>f(z)), then f(z) has a specific expression f(z) = a(z) + Be<sup>Az</sup>, where A and B are two non-zero constants and a(z) reduces to a constant.
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Surfactant-free synthesis of CuBr NPs decorated by Pt for glucose and nitrite sensors
Xinmei Liu,Xue Zhou,Chunyang Yang,Wenlong Yang,Gang Liu,Yuhang Li,Guangyu Zhang,Xu Zhao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
The high cost and narrow detection range of electrocatalyst are the two major challenges for the electrochemicalbiosensors. This work provided a surfactant-free synthesis of CuBr@Pt nanoparticles (CuBr@PtNPs) with controllable Pt loading rates. The introduction of chloroplatinic acid (H2PtCl6) and an elevatedsynthesis temperature resulted in a high surface area for CuBr@Pt NPs. The abundant active sites enabledthe CuBr@Pt NPs a superior performance as applied in glucose and nitrite detection. Moreover, an optimalPt loading would be conducive to optimize sensor performances of CuBr@Pt NPs. In the glucose detection,the sensor by CuBr@Pt-15% could reach the detection concentration up to 68.0 mM, which was 1.9 timeshigher than that by pure CuBr. And the corresponding sensitivity by CuBr@Pt-15% was calculated to be382.73 lA/mMcm2. In the detection of sodium nitrite, CuBr@Pt-15% also revealed a superior behaviorthan previous work. And the detection concentration (by the linear sweep voltammetry) was form 0 to80.0 mM. This work demonstrated the superior biosensor performance of CuBr@Pt-15%, which offereda promising material for sensor with wider detection range and rationalized cost.
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Application of amine-loaded activated carbon fiber in CO2 capture and separation
Haoran Liu,Xinmei Lu,Liying Liu,Jian Wang,Pengyu Wang,Peng Gao,Tingsheng Ren,Guo Tian,Di Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
The CO2 emitted by coal-fired power plants is the main factor leading to global warming, and the captureof CO2 in the flue gas of power plants is still the main task at this stage. Many adsorbents have been developed to captureCO2 in high-temperature flue gas, but some materials are complicated to synthesize or the cost is too high. Here,we used low-cost raw materials activated carbon fiber and PEI, and used green synthesis to synthesize new adsorbentsin order to capture CO2 in high-temperature flue gas of a power plant. To improve the performance of highly porousactivated carbon fiber (ACF) in CO2 capture and separation, an organic polymer polyethylenimine (PEI) was loadedsuccessfully into the oxidized ACF. The modified adsorbent was tested by FT-IR, XRD and SEM, and the CO2 adsorptioncapacity and CO2/N2 selectivity were analyzed. The results showed that the as-synthesized PEI-modified adsorbenthas a CO2 adsorption capacity of 2.5mmol/g, which is 1.7 times better than that of the pristine ACF adsorbent(1.5mmol/g), at 1 bar and 333 K, and it has excellent CO2/N2 selectivity, as calculated by ideal adsorption solution theory(IAST). These data indicate that PEI was loaded successfully into the oxidized ACF. In addition, the dual site Langmuirisotherm equation and Langmuir isotherm equation can be in good agreement with the adsorption curves ofCO2 and N2. In comparison with other composite adsorbents, the preparation process of the present new adsorbent ishighly environmentally friendly, the synthesis method is simple and the cost is low, which demonstrates potential applicationsin the separation of CO2 from the flue gas of power plants.
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Dongmin Zhao,Qing Tao Liu,Xinmei Huang,Huili Wang,Kaikai Han,,Jing Yang,Keran Bi,Yuzhuo Liu,Lijiao Zhang,Yin Li 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.4
Heat shock protein A9 (HSPA9), a member of the heat shock protein family, is a putative receptor for Tembusu virus (TMUV). By using Western blot and co-immunoprecipitation assays, E protein domains I and II were identified as the functional domains that facilitate HSPA9 binding. Twenty-five overlapping peptides covering domain I and domain II sequences were synthesized and analyzed by using an HSPA9 binding assay. Two peptides showed the capability of binding to HSPA9. Dot blot assay of truncated peptides indicated that amino acid residues 19 to 22 and 245 to 252 of E protein constitute the minimal motifs required for TMUV binding to HSPA9. Importantly, peptides harboring those two minimal motifs could effectively inhibit TMUV infection. Our results provide insight into TMUV–receptor interaction, thereby creating opportunities for elucidating the mechanism of TMUV entry.
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