INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Guangjin Yu,Jing Wang,Qingshan Xiong,Yunqi Xu,Shouhu Xuan,Ken Cham-Fai Leung,Qunling Fang
With the prevalence of drug-resistant bacteria and the waning effects of antibiotics, nanoplatform has become an effective strategy for fighting infections. This work reports a dipolar-hollowed α-Fe 2 O 3 @Au/Polydopamine (PDA) nanospindle which possesses both photothermal-photodynamic (PTT-PDT) coupling antibacterial and drug carrying performance. Firstly, the spindle type α-Fe 2 O 3 @Au/PDA particle was prepared by a simple one-step strategy and then the dipolar-hollow structure was obtained by controlling etching the inside α-Fe 2 O 3 core with hydrochloric acid. After further loading the photosensitizer zinc phthalocyanine (ZnPc), the dipolar-hollowed α-Fe 2 O 3 @Au/PDA-ZnPc nanospindles were obtained. Owing to the dipolar-hollowed interior, the nanospindles are also effective in carrying antitumor drug doxorubicin (DOX) and shows a good drug loading-release behavior. The dipolar-hollowed α-Fe 2 O 3 @Au/PDA nanospindles exhibits a high antibacterial performance against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) under near-infrared (NIR) and Xenon lamp irradiation. When α-Fe 2 O 3 @Au/PDA-ZnPc nanospindles concentration was increased to 100 μg/mL, the antibacterial rate was close to 100 %. In comparison to the original α-Fe 2 O 3 @Au/PDA nanospindles, the product achieved a lower effective antibacterial temperature. This triple-mode therapy (PTT/PDT/Drug) provides an interesting design idea for anisotropic therapeutic nanoplatform which can be applied in low-temperature antibacterial and drug delivery.
研究领域:
纳米医学
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生物材料学
·
抗菌研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaoxiao Dong,Chang Lu,Shuaijie Guo,Siqi Zhang,Xuelian Hu,Wenliu Wang,Yiwei Tang,Shuo Wang,Xiuying Liu
A magnetic NiFe 2 O 4 @TiO 2 @Au composite was successfully synthesized via layer-by-layer assembly approach and exhibited excellent SERS performance. The composite was functionalized with an aptamer modified with Cy3, serving as the Raman signal reporter, and was hybridized with complementary DNA oligonucleotides (cDNA) to construct the NiFe 2 O 4 @TiO 2 @Au@ssDNA SERS aptasensor. This aptasensor enabled the development of a sensitive, specific, and straightforward SERS assay for acetamiprid detection, exhibiting good accuracy. Under optimized conditions, an inverse correlation was established between the acetamiprid concentration and the Raman intensity at the characteristic peak of 1132 cm −1 , spanning a range of 10 −1 -10 4 nmol/L with a LOD of 8.4 × 10 −1 pmol/L. Standard addition experiments to three types of leafy vegetables samples yielded recoveries ranging from 94.30 % to 111.83 %, with a relative standard deviation of <5.56 %. This method shows potential for detecting other hazardous substances in food and environmental samples by simply changing the corresponding aptamers and cDNA.
研究领域:
分析化学
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食品安全
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Na Li,Changhong Wang,Tingzhen Li,Brendan Latimer,Zhen Liu,Zhenghua Tang
Bimetallic nanoparticles with core-shell structure usually demonstrate enhanced catalytic performance due to the lattice strain created between the core and the shell region. The Au@Ag core-shell nanoparticles with different Au-to-Ag molar ratios were firstly fabricated by a facile method under mild conditions, and the n(Au): n(Ag) = 1: 2 sample showed the best electrocatalytic activity toward oxygen reduction reaction (ORR), a key reaction which plays an important role in fuel cells and metal-air batteries. Subsequently, the Au@Ag nanoparticles of n(Au): n(Ag) = 1: 2 were loaded on carbon nanotubes to prepare nanocomposite catalysts with different metal mass ratios of 20% Au@Ag/CNTs, 30% Au@Ag/CNTs, 40% Au@Ag/CNTs, and 50% Au@Ag/CNTs. The characteristics of the as-synthesized nanocomposites were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) as well. The nanocomposites demonstrated effective electrocatalytic performance toward ORR. Electrochemical tests showed that the 30% Au@Ag/CNTs sample exhibited the highest activity among the series, in aspects of onset potential and kinetic current density. Furthermore, the sample of 30% Au@Ag/CNTs exhibited markedly higher long-term stability than Pt/C. The results clearly illustrate that the Au@Ag core-shell nanoparticles-based nanocomposites hold great potentials as efficient ORR catalysts for fuel cell applications.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
TALANTA
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2020
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IF 5.339
Ting Zhang,Lingli Lei,Meiling Tian,Junjie Ren,Zhisong Lu,Yang Liu,Yingshuai Liu
An ultrasensitive lateral flow immunoassay (LFIA) strip has been developed based on a multifunctional photothermal contrast Fe 3 O 4 @Au supraparticle (Fe 3 O 4 @Au SP) for quantitative Ochratoxin A (OTA) detection. The Fe 3 O 4 @Au SP composite not only shows a better photothermal effect over Fe 3 O 4 and gold nanoparticles , but possesses magnetic property and excellent ability to directly adsorb protein (antibody). Under 808 nm irradiation, photothermal images of the test strips are recorded by a portable Infrared thermal camera. A quantitative analysis is easily achieved based on the thermal changes, which are proportional to the concentrations of analytes. Under an optimal condition, a wide linear detection range from 1 pg mL⁻ 1 to 1μgmL⁻ 1 and a limit of detection (LOD) at 0.12 pg mL⁻ 1 have been achieved with OTA as a model analytes. The practical application potential has also been validated by detection of OTA in spiked corn , peanut, and soybean extractives with overall recoveries ranging from 98.6% to 115% and coefficient of variations (CVs) between 6.06% and 12.73%. The photothermal LFIA renders a rapid, sensitive, and quantitative bio-/chemo-sensing platform with only a portable laser source and a thermal camera.
研究领域:
生物医学工程
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食品安全检测
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2019
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IF 3.674
Bowen Lu,Fengjiao Quan,Zheng Sun,Falong Jia,Lizhi Zhang
Photothermal reverse-water-gas-shift is realized with high conversion rate and selectivity of CO in the case of Au/CeO 2 catalyst. Moreover, photothermal reaction rate is much higher (>10 times) than that performed under thermal condition. As indicated by the results of in-situ infrared spectroscopy and kinetic experiments, the special role of light is found to be related with the promotion of hydrogen-splitting step. The robust Au/CeO 2 catalyst exhibits stable activity and CO selectivity under long-term light irradiation. It is expected that the combination of catalysts and light may afford new perspectives for the CO 2 hydrogenation.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yuting Guan,Siyu Wang,Guanghua Lei,Zikang Hu,Hengye Chen,Huiwen Gu,Xiaoli Yin,Yuanbin She,Wanjun Long,Haiyan Fu
Enshi Yulu green tea (ESYL) is the most representative traditional steamed green tea in Enshi, Hubei. Different ESYL grades exhibit distinct flavors, tastes, and prices. In this study, a visual sensor based on 4-MPBA Au@AgNPs was developed for the rapid and accurate identification of ESYL grades. The recognition mechanism involved the binding of 4-MPBA Au@AgNPs with polyphenolic compounds in ESYL to form borate esters and the conversion of Ag + to Ag 0 , with the generated Ag 0 depositing on the surface of 4-MPBA Au@AgNPs. The results showed that the sensor can amplify the color differences of different grades of ESYL. The visual results were also validated by the partial least squares discriminant analysis model, demonstrating an enhancement in recognition accuracy from 68.2 % to 95.5 % compared to the original extraction solution. The colorimetric sensor developed in this study is expected to provide a new approach for traceability research of other foods.
研究领域:
食品科学
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分析化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2022
·Vol. 24
·期 22
·8840-8852
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IF 11.034
Zongyang Liu,Yuan Tan,Jie Li,Xiuli Li,Yan Xiao,Juan Su,Xingkun Chen,Botao Qiao,Yunjie Ding
Aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is a promising alternative route to produce renewable biodegradable plastics, which has stimulated intense interest in recent years. Supported gold catalysts have shown great potential for this reaction, but the selectivity and stability need to be improved. In addition, the requirement for base additives makes the process less effective and sustainable. Herein, highly active and selective Au–Ag bimetallic nanoclusters supported on MgAl-hydrotalcite (HT) were developed for HMF oxidation to FDCA under base-free reaction conditions using molecular oxygen as the oxidant. The presence of small amounts of Ag (0.034–0.065 wt%) in Au25 clusters greatly enhanced the catalytic reaction rates and selectivity for HMF tandem oxidative steps, leading to both high conversion of HMF (>97%) and high yield of FDCA (>95%). Besides, the catalyst stability was also enhanced by the addition of Ag. The characterization results suggested that the substitution of Ag atoms modified the electronic structure of Au while likely maintaining the primary geometry. Thus, a significant synergistic effect could be observed over trace Ag modified Au–Ag bimetallic nanoclusters. The present work provides new insight into the alloying effect, and helps understand highly efficient Au-based catalysts for aerobic oxidation of biomass derived molecules under base-free conditions.
研究领域:
催化化学
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可再生资源化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
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IF 6.14
Zeai Huang,Yaolin Chen,Jundao Wu,Wenwen Xie,Xiaoting He,Minzhi Ma,Kazuhiro Sayama,Ying Zhou
Production of peroxodisulphate (S2O82–) on powdered photocatalysts is a promising way to obtain high-value-added chemicals using solar energy; however, it is still suffering from low efficiency. In the present work, we fabricated bimetallic Au core and Pt shell nanoparticle-loaded WO3 (Au@Pt/WO3) photocatalyst for enhanced production of S2O82–, which is 1.7 times that of Pt nanoparticle-loaded WO3 (Pt/WO3), and was reported to be the best catalyst for S2O82– production. A further study demonstrated that the electronic interaction of Pt was successfully modulated by the core–shell nanoparticle architecture, and the core–shell nanoparticle structure between Au and Pt improved the formation of the surface chemical state of Pt to be metallic Pt, proposed as the active site for oxygen reduction. Besides, the core–shell nanoparticle structure also exposed a large amount of Pt on the surface of the substrate. As a result, Au@Pt/WO3 showed significantly enhanced photocatalytic activity of S2O82– with a quantum efficiency of 5.2% at 420 nm, whereas Pt–Au bimetallic alloy nanoparticle-loaded WO3 with a large amount of surface PtOx and exposed both Au and Pt on the surface showed very low activity. This work provides insights into the bimetallic Pt nanoparticle-loaded WO3 for enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Benlin Dai,Xin Chen,Xiaofan Yang,Gang Yang,Shijie Li,Lili Zhang,Feihu Mu,Wei Zhao,Dennis Y.C. Leung
A novel S-scheme Au/g-C 3 N 4 /BiO 1.2 I 0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C 3 N 4 nanosheets for the first time. This Au/g-C 3 N 4 /BiO 1.2 I 0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C 3 N 4 /BiO 1.2 I 0.6 ) can reach 0.0174 min −1 (apparent rate of BPAF degradation) and 0.0204 min −1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C 3 N 4 , respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C 3 N 4 /BiO 1.2 I 0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2015
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IF 2.719
Yan Song,Guixia Liu,Xiangting Dong,Jinxian Wang,Wensheng Yu
Luminescence resonance energy transfer (LRET) system can be constructed using NaYF 4 :Tb 3+ luminescence nanocrystals and gold nanoparticles (AuNPs) served as energy donor and acceptor, respectively. The AuNPs modified by cetyltrimethylammonium bromide (CTAB) were synthesized first and NaYF 4 :Tb 3+ shells encapsulated Au cores via a hydrothermal method . The synthesized materials were well characterized by X-ray diffraction (XRD), Fourier-transform infrared spectra (FT-IR), Transmission electron microscopy (TEM), X-ray photoelectron spectrum (XPS), UV–vis absorption spectra (UV–vis) and photoluminescence (PL) measurement. The results indicate that the synthesized Au@NaYF 4 :Tb 3+ core–shell nanoparticles have spherical morphology with a size of 80–90 nm and the shell layers of NaYF 4 :Tb 3+ nanocrystals have pure cubic structure. The luminescence properties of Au@NaYF 4 :Tb 3+ core–shell nanoparticles are same as those of NaYF 4 :Tb 3+ particles. The LRET process was realized using the core–shell nanoarchitectures due to the absorption spectrum of AuNPs matches well with the major emission peaks of Tb 3+ ions. The LRET experiments have successfully verified the energy transfer between NaYF 4 :Tb 3+ nanocrystals and AuNPs. Additionally, the emission intensities of Tb 3+ ions and the content of AuNPs exhibited a fair linear correlation.
研究领域:
材料科学
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光物理学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 19
·8287-8297
·
IF 3.5
Liu Yang,Jiang Lu,Jiang Ruonan,Liu Huanhuan
Researchers are showing a great deal of interest in hydrogels due to the presence of high-water content, self-healing variants. Despite this, research into the development of smart hydrogels that have the combination of toughness, self-healing, and responsiveness to external stimuli is still lacking. Here, tough, and intelligent nanocomposite (NC) hydrogels have been developed by utilizing modified nano-crosslinker by means of gold-selenium (Au-Se) coordination interaction. The NC hydrogels demonstrate remarkable elasticity and strength, even when exposed to notches. With the optimal formulation, the nanocomposite hydrogel can achieve a maximum elongation of 1970%, a maximum fracture stress of 2.48 MPa, and a toughness of up to 9.95 MJ/m 3 , thanks to the dynamic gold crosslinks with improved branching. The presence of this structural attributes facilitates efficient energy dissipation within the hydrogel system. Combining Au-Se interaction as a healing element and the remarkable optothermal effect of nanoparticles, NC hydrogels can be quickly self-healed in near-infrared light exposure of 2 min, achieving a self-healing efficiency of 91%. Additionally, the hydrogels demonstrate repair potential when exposed to microwave irradiation, acid solution, and ultrasound stimulus. Moreover, a multi-responsive hydrogel composed of photothermal gold nanostructures can serve as a light-controlled drug carrier, which has smart drug release ability under external light stimulation. The advantageous properties of hydrogel make it a great option for biomedical and engineering fields.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Lecheng Zhao,Jiaxin Luo,Shutian Wang,Jiayu Sun,Hongyu Chen,Yawen Wang
Amine ligands have been widely applied as morphology-directing reagents in nanostructure synthesis. In this work, we explored the application of the amine ligands in the active surface growth mechanism in place of the strong thiolated ligands. Despite being weaker compared to the thiols, amine ligands such as aniline were also shown to be capable of facilitating the template-less electrodeposition of Au nanowires (NWs) on the substrate via the active surface growth mechanism. Given the close binding difference between the amine-grafted substrate and the ligands, substrate functionalization becomes critically important for effective construction of the active surface and the growth of the nanowires. Additionally, the growth with the amine ligands took place at more positive reduction potentials and is less prone to splitting and bundle formation. A systematic generality study revealed that besides the aromatic amines, long-chain aliphatic amines were also capable of facilitating nanowire growth. Given the weak binding affinity of the amine ligands, the Au NWs are readily accessible for further processing to generate sophisticated one-dimensional structures. As a demonstration, tandem electrodeposition was performed to directly obtain coaxial core–shell Au@Pt NWs with adjustable length, diameter, and shell thickness.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）