COLLOIDS AND SURFACES B-BIOINTERFACES
·
2015
·
IF 4.152
Chuanming Hao,Yuezhi Cui,Pengfei Yang,Huayong Zhang,Dejiang Mao,Xiao Cui,Junying Li
A series of organosilicon Bola-form bi-quaternary ammonium amphiphiles , [OH 5 C 3 (C 2 H 5 ) 2 N + -(CH 2 ) 3 -Si(CH 2 ) 3 -O-(Si(CH 3 ) 2 O) n -Si(CH 2 ) 3 ⋯(CH 2 ) 3 -N + (C 2 H 5 ) 2 C 3 H 5 O]Cl 2− (Si n N 2 Cl 2 , n = 0, 4, 6, 8), with the same headgroups and different length of hydrophobic linkage has been synthesized. The critical micelle concentration (CMC) of each amphiphiles was determined by equilibrium surface tension. With the increased length of hydrophobic siloxane spacer, the CMC values follow the order of Si 8 N 2 Cl 2 < Si 6 N 2 Cl 2 < Si 4 N 2 Cl 2 < Si 0 N 2 Cl 2 . At the same time, thermodynamic parameters ( Δ G m 0 , Δ H m 0 , Δ S m 0 ) of micellization were calculated by Gibbs equation under the mass action model. It indicates that the micellization of the amphiphiles in aqueous solution is entropy-driven. Especially, the surface area ( A min ) of Si 4 N 2 Cl 2 is the largest attributing to the interaction of free-rotated siloxane spacer and its internal oxygen atom, which make the molecular stretch free. The antimicrobial property of Si 4 N 2 Cl 2 is more effective than others below the concentration of CMC , while the antimicrobial property of Si 8 N 2 Cl 2 is more effective above the concentration of CMC, which indicated that both the adsorbability in formation of micellar and the hydrophobicity arising from the different length of siloxane spacer are important to inhibit microbe. Moreover, their wetting ability has been characterized by contact angles on various material surfaces. It shows that the higher weight of lipophilic siloxane spacer leads to lower contact angels.
研究领域:
材料科学
·
生物学
·
表面化学
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高影响因子
COLLOID JOURNAL
·
2017
·Vol. 79
·期 1
·133-137
·
IF 0.859
Tian Yanping,Ouyang Lei,Xiao Mingshu,Zhou Hualan
Well-dispersed Au/Bi nanoparticles with average size below 10 nm were prepared by using NaBH 4 to reduce HAuCl 4 with glucose as dispersant. The obtained Au/Bi NPs were well characterized by UV-Vis spectra, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and electrochemical measurements. The electrochemical study found that Bi adlayers on the surface of Au nanoparticles owns two kinds of surface structures, including a low coverage (2 × 2)-Bi adlayer and a close-packed (p × √3)-2 Bi adlayer due to the strong interaction between the two Bi layers and the below Au atoms, which is same with that bulk on Au surface.
研究领域:
材料科学
·
纳米技术
·
电化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jinwang Li,Jianglin Tu,Zhefei Pan,Liang An,Rong Chen
The development of efficient electrocatalysts for sustainable ammonia synthesis via the nitrogen reduction reaction remains a critical challenge due to the inherent stability of N ≡ N bonds and competing hydrogen evolution reaction. Herein, we present a bimetallic Bi-Sn catalyst synthesized through galvanic replacement and electrodeposition, demonstrating enhanced nitrogen reduction performance under ambient conditions. The optimized Bi-Sn catalyst achieves an ammonia yield of 17.09 μg h −1 ·mg cat −1 with a Faradaic efficiency of 5.37 % at −0.4 V vs. reversible hydrogen electrode, representing an obvious improvement over pristine Bi. Comprehensive characterization reveals that Sn nanoparticles are uniformly decorated on the Bi surfaces, increasing the electrochemical surface area while enhancing electrode conductivity. Theoretical calculations elucidate the synergistic mechanism: Sn modulates the Bi 6p band center, reducing the energy barrier for the rate-determining step of ∗N 2 → ∗NNH by 16.9 % (ΔG = 1.72 eV vs. 2.07 eV for Bi) and enhancing nitrogen adsorption (0.20 eV vs. 0.28 eV). This work establishes an integrated strategy of structural engineering and electronic modulation for designing bimetallic catalysts, advancing sustainable ammonia synthesis.
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Advanced Sensor Research
·
2023
·Vol. 2
·期 8
·2200050
·
IF 0
Caihong Wang,Ruizhuo Ouyang,Jinyao Liu,Yuefeng Zhao,Yuhao Li,Ning Guo,Baolin Liu,Yuqing Miao
Novel coronary Au@Bi nanospheres (NSs) are simply synthesized by sparkling gold nanoparticles (Au NPs) on the surface of bismuth (Bi) NSs and successfully used as highly impedance-sensitive immunosensing platform to develop a new label-free electrochemical immunosensor for the detection of carcinoembryonic antigen (CEA). Firstly, Bi NSs are prepared by one-pot hydrothermal method, showing uniform sphere morphology with a dense oxide film formed outside Bi NSs due to the easy oxidation of Bi in the air. The oxide film significantly hinders the transmission of electrons and effectively improves the sensitivity of the proposed electrochemical impedance immunosensor. The surface functionalization of Bi NSs with Au NPs enhances the biocompatibility, stability, as well as active surface area of the produced Au@Bi NSs, preferable for the efficient loading of antibody molecules. The electrochemical impedance spectroscopy (EIS) is selected as the optical technique to measure CEA with the constructed immunosensor based on Au@Bi NSs. Because of the excellent impedance-responsive performance, this new immunosensor displays highly sensitive detection toward CEA in a linear range of 50 fg mL −1 –100 ng mL −1 with an extremely low detection limit of 9.83 fg mL −1 and could be potentially used in early clinical detection of cancer.
研究领域:
生物医学工程
·
分析化学
·
纳米技术
·
肿瘤学
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DOI
Nanoscale
·
2020
·Vol. 12
·期 35
·18418-18428
·
IF 6.895
Chen Bai,Pengcheng Hu,Wei Zhang,Lina Song,Di Liu,Yi Chen,Ming Ma,Ning Gu,Yu Zhang
Nanocarrier systems play an important role in cancer immunotherapy. In this article, biotinylated CD20 and CD3 antibodies were conjugated onto the surface of streptavidin modified ultra-small Fe3O4 nanoparticles via specific binding between streptavidin and biotin to construct a bi-specific nanoplatform (BSNP). The synthesized BSNP with 30 nm hydrodynamic size provides a better magnetic resonance imaging ability than the clinical Gd-chelated contrast agents (r1 value is 5.27 mM−1 s−1 and 4.52 mM−1 s−1 for BSNP and Magnevist, respectively). This nanoplatform can target CD20-positive Raji cells and enhance the T cell mediated cell killing effect in vitro. Further, it can also inhibit tumor growth and prolong the survival time of non-Hodgkin's lymphoma (NHL) xenograft model in vivo. The probable mechanism is that while BSNP can directly induce the apoptosis of Raji cell via aggregation of CD20, T cells are recruited around tumor cells by the BSNP leading to T cell-mediated tumor cell lysis. In addition, the enhanced dual-modal MRI-fluorescence images can be acquired. In summary, the modular designed BSNP provides an efficient immune-related cancer theranostic strategy, which is of great potential as a simple and universal nanoplatform by combining different antibodies to enhance the cancer theranostic efficacy.
研究领域:
纳米技术
·
癌症免疫治疗
·
生物医学工程
·
分子生物学
·
医学影像
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DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Pan Zhang,Yuanyuan Cui,Yongji Yao,Wei Wei,Yuanyuan Sun,Kaiqiang Zhang,Yanfeng Gao
Developing cheap and efficient materials for enhancing the photochromic performance upon visible or solar light irradiation is a hot-topic in the field of solar energy conversion . However, few inorganic photochromic materials can provide satisfying applications due to their low coloring and bleaching efficiency as well as slight color change. Here, we synthesized the bismuth tungstate (Bi 2 WO 6 ) ultrathin nanosheets with the thickness of 1.29 nm via co-precipitation-hydrothermal method using cetyltrimethylammonium bromide (CTAB) surfactant . The prepared ultrathin nanosheets show the similar crystalline structure but a narrowed band gap of 2.73 eV, as compared with the 2.86 eV of pristine Bi 2 WO 6 . Additionally, the numerous [WO 6–x Br 2x ] species and abundant “Bi–O″ vacancy pairs on the surface can serve as active sites that suppress the recombination of photogenerated electron-hole pairs and capture the photogenerated electrons to form the color trapping centers. As a result, Bi 2 WO 6 ultrathin nanosheets exhibit excellent photochromic behavior upon solar light irradiation (coloring time of 5 s) and under dark atmospheric treatment (bleaching time of 35 min) compared with WO 3 -based photochromic materials (coloring time of 20–60 min and bleaching time of 3 h days).
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Journal of Advanced Ceramics
·
2017
·Vol. 7
·期 1
·1-4
·
IF 1.198
Zheng Huiping,Nian Hongqiang,Xia Jinfeng,Zhou Guohong,Jiang Danyu,Li Qiang
To quantify the oxygen content in molten salts, we examined the performance of an yttria-stabilized zirconia solid electrolyte oxygen sensor with a Bi/Bi 2 O 3 reference electrode, focusing on its output accuracy. When the above sensor was tested in a flow of gas with known oxygen partial pressure, \(p_{O_2}\) , a linear relationship between \(lgp_{O_2}\) and the electromotive force (EMF) was observed, and the correlation slope exhibited a positive deviation from Nernstian behavior. EMF measurements performed in molten NaCl–KCl indicated that the oxygen content of this salt mixture increased with increasing oxygen partial pressure in the covering gas, in agreement with Henry’s law. Moreover, the EMF exhibited a linear decrease with increasing melt temperature of molten NaCl–KCl, in agreement with the theoretical model. Finally, a relationship between the structure of molten NaCl–KCl and its oxygen diffusion behavior was established. As a result, the developed sensor was demonstrated to be well suited for determining the oxygen content of molten salts.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 8
·3989-3995
·
IF 2.394
Zhang Shao-hui,Liu Bao-sheng,Ai Bao-Shan,Wang Zhen-bo
In this article, calcination at high temperature is used to dope bismuth into the lead lattice, forming a composite metal oxide. The impact of bismuth doping on the conductivity of the cathode material PbO 2 and the structural framework during charge-discharge cycles is investigated. SEM and XRD are used to understand the structure and morphology of the lead-bismuth composite oxide, while cyclic voltammetry and electrochemical impedance spectroscopy are used to determine its resistance and electrochemical properties. Battery cycling tests are performed to evaluate the impact of bismuth doping on the performance of the lead-acid cathode material, and it was found that discharge capacity at 2 C increased by 15% while retaining 90% of its initial capacity after 250 cycles.
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高影响因子
Journal of Tissue Viability
·
2021
·
IF 2.932
Leilei Sun,Laihao Li,Yueqi Wang,Mingbo Li,Shumin Xu,Chengpeng Zhang
Aim of the study The aim of the study was to fabricate collagen-based composite dressings, evaluate the efficiency for wound healing and reveal the mechanism of promoting wound healing. Materials and methods An innovative bi-layered composite wound dressing was developed using two marine biomacromolecules (collagen and chitosan). Full-thickness skin defect model was performed to evaluate the wound healing activity in vivo . The levels of inflammatory cytokines including tumor necrosis factor alpha (TNF-α), interleukin (IL-1, IL-6, IL-8) and growth factors like transforming growth factor beta (TGF-β), vascular epidermal growth factor (VEGF) and basic fibroblast growth factor (bFGF) were quantified by ELISA assays. The total amount of collagen was quantified by hydroxyproline content. The proliferation and viability of fibroblast cells cultured on collagen sponges were determined by CCK-8 assay. Results The results of wound closure and histopathological analysis indicated that non-crosslinked collagen-based bi-layered composite dressing stimulated wound healing, accelerated re-epithelialization and accomplished wound healing within a time span of 28 days. The results of levels of inflammatory cytokines and growth factors showed that collagen-based composite dressings could reduce the inflammatory response and upregulate growth factors levels to accelerate the wound healing. The results of hydroxyproline content and CCK-8 assay indicated that collagen-based composite dressings could also promote collagen synthesis and fibroblasts viability and proliferation. Conclusion The non-crosslinked collagen-based bi-layered composite dressing could be applied for an efficient and ideal wound dressing. Therefore, the findings provided the essential theoretical basis for the potential of collagen-based composite dressing applied in wound healing fields.
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 1
·120-126
·
IF 1.063
Chen Jianfei,Chen Xiaoyu,Zhang Xing,Yuan Yao,Bi Ruyi,You Feifei,Wang Zumin,Yu Ranbo
BiVO 4 , a promising visible-light responding photocatalyst, has aroused extensive research interest because of inexpensiveness and excellent chemical stability. However, its main drawback is the poor photoinduced charge-transfer dynamics. Building nanostructures is an effective way to tackle this problem. Herein, we put forward a new method to prepare nanostructured BiVO 4 from Bi-based metal-organic frameworks[Bi-MOF(CAU-17)] precursor. The as-prepared material has a rod-like morphology inherited from the Bi-MOF sacrificial template and consists of small nanoparticle as building blocks. Compared with its counterparts prepared by conventional methods, MOF-derived nanostructured BiVO 4 shows better light absorption ability, narrower bandgap, and improved electrical conductivity as well as reduced recombination. Consequently, BiVO 4 nanostructure demonstrates high photocatalytic activity under visible light towards the degradation of methylene blue. Methylene blue can be degraded up to 90% within 30 min with a reaction rate constant of 0.058 min −1 . Moreover, the cycling stability of the catalyst is excellent to withstand unchanged degradation efficiency for at least 5 cycles.
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高影响因子
Acta Biomaterialia
·
2018
·
IF 6.383
Fenglin Hu,Kaimin Chen,Hong Xu,Hongchen Gu
An ideal nanomaterial for use in the bio-medical field should have a distinctive surface capable of effectively preventing nonspecific protein adsorption and identifying target bio-molecules. Recently, the short-chain zwitterion strategy has been suggested as a simple and novel approach to create outstanding anti-fouling surfaces. In this paper, the carboxyl end group of short-chain zwitterion-coated silica nanoparticles (SiO 2 -ZWS) was found to be difficult to functionalize via a conventional EDC/NHS strategy due to its rapid hydrolysis side-reactions. Hence, a series of bi-functionalized silica nanoparticles (SiO 2 -ZWS/COOH) were designed and prepared by controlling the molar ratio of 3-aminopropyltriethoxysilane (APTES) to short-chain zwitterionic organosiloxane (ZWS) in order to achieve above goal. The synthesized SiO 2 -ZWS/COOH had similar excellent anti-fouling properties compared with SiO 2 -ZWS, even in 50% fetal bovine serum characterized by DLS and turbidimetric titration. Subsequently, SiO 2 -ZWS/COOH 5/1 was chosen as a representative and then demonstrated higher detection signal intensity and more superior signal-to-noise ratios compare with the pure SiO 2 -COOH when they were used as a bio-carrier for chemiluminescence enzyme immunoassay (CLEIA). These unique bi-functionalized silica nanoparticles have many potential applications in the diagnostic and therapeutic fields. Statement of significance Reducing nonspecific protein adsorption and enhancing the immobilized efficiency of specific bio-probes are two of the most important issues for bio-carriers, particularly for a nanoparticle based bio-carrier. Herein, we designed and prepared a bi-functional nanoparticle with anti-fouling property and bio conjugation capacity for further bioassay by improving the short-chain zwitterionic modification strategy we have proposed previously. The heterogeneous surface of this nanoparticle showed effective anti-fouling properties both in model protein solutions and fetal bovine serum (FBS). The modified nanoparticles can also be successfully functionalized with a specific antibody for CLEIA assay with a prominent bio-detection performance even in 50% FBS. In this paper, we also investigated an unexpectedly fast hydrolysis behavior of NHS-activated carboxylic groups within the pure short-chain zwitterionic molecule that led to no protein binding in the short-chain zwitterion modified nanoparticle. Our findings pave a new way for the designing of high performance bio-carriers, demonstrating their strong potential as a robust platform for diagnosis and therapy.
研究领域:
生物医学
·
材料科学
·
免疫学
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DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2335
·
IF 4.6
Hongquan Kang,Jianzhou Wu,Baohui Lou,Yue Wang,Yilin Zhao,Juanjuan Liu,Shihui Zou,Jie Fan
The rational regulation of catalyst active sites at atomic scale is a key approach to unveil the relationship between structure and catalytic performance. Herein, we reported a strategy for the controllable deposition of Bi on Pd nanocubes (Pd NCs) in the priority order from corners to edges and then to facets (Pd NCs@Bi). The spherical aberration-corrected scanning transmission electron microscopy (ac-STEM) results indicated that Bi2O3with an amorphous structure covers the specific sites of Pd NCs. When only the corners and edges of the Pd NCs were covered, the supported Pd NCs@Bi catalyst exhibited an optimal trade-off between high conversion and selectivity in the hydrogenation of acetylene to ethylene under ethylene-rich conditions (99.7% C2H2conversion and 94.3% C2H4selectivity at 170 °C) with remarkable long-term stability. According to the H2-TPR and C2H4-TPD measurements, the moderate hydrogen dissociation and the weak ethylene adsorption are responsible for this excellent catalytic performance. Following these results, the selectively Bi-deposited Pd nanoparticle catalysts showed incredible acetylene hydrogenation performance, which provides a feasible perspective to design and develop highly selective hydrogenation catalysts for industrial applications.Keywords:acetylene hydrogenation;active sites;selective deposition;palladium;bismuth
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高影响因子
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