MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xin Wang,Xiaodan Zhang,Haiyan Cao,Yuming Huang
N-doped Ti 3 C 2 quantum dots (N-Ti 3 C 2 QDs) as the fluorescent nanoprobe were synthesized through inorganic base (i.e. KOH) stripping and solvothermal approach. The N-Ti 3 C 2 QDs displayed well-monodispersed near-spherical particles with average size of 2.3 nm, exhibited brightly blue emission and good stability, and possessed 14.46% of fluorescent quantum yield. Upon addition of Co 2+ or Ag + ions, the fluorescence (FL) of N-Ti 3 C 2 QDs could be quenched significantly. Mechanism investigation indicated that the inner filter and static extinguishing effects are responsible for the Co 2+ or Ag + ions induced FL quenching of the N-Ti 3 C 2 QDs. Based on above outcomes, we developed a simple N-Ti 3 C 2 QDs based fluorescent assay for the simultaneous determination of Co 2+ and Ag + ions, with a low detection limit of 0.21 and 0.10 μM, respectively. The assay was used to determine the content of Co 2+ and Ag + in real samples. This work will provide another way for the synthesis of fluorescent N-Ti 3 C 2 QDs and exploited their application in simultaneous detection of Co 2+ and Ag + .
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yu Chen,Huan Chen,Haihua Wang,Xia Xin,Wenbing Kang
Silver nanoclusters (NCs) possess precise and tunable structures characterized by their unique properties, yet a single component often underperforms in practical applications. In this work, a series of stable and highly effective antibacterial gels were prepared by incorporating fluoropolymer (perfluoro-2, 5-dimethyl-3, 6-dioxactyl glycol acrylate-co-acrylic acid, FAA) into aqueous solutions of (NH 4 ) 6 [Ag 6 (mna) 6 ] (Ag 6 -NCs). It can be quickly gelated within a few seconds to achieve the rapid transformation of one-dimensional into three-dimensional structures. These gels are formed through the layering of nanowires, and their mechanical properties can be tailored by adjusting the FAA concentration. The assembly process of Ag 6 -NCs/FAA hydrogels was investigated by comparing it with various poly carboxylic acids, neutralized FAA, and aqueous AgNO 3 solutions under identical experimental conditions. This assembly results from various interactions, including hydrophobic interactions, van der Waals forces and hydrogen bonds. Furthermore, the hydrogel system demonstrated improved antibacterial activity due to the presence of Ag ions and fluorine atoms. The functional composite of materials, achieved through heterogeneous assembly, promoted the design of metal NC materials and furthered the development of macro manufacturing technology.
研究领域:
材料科学
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生物学
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化学工程
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产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Yun Mou,Hao Wang,Yang Peng,Jiaxin Liu,Hao Cheng,Qinglei Sun,Mingxiang Chen
Poor flexibility and high contact resistance of conductive films are primary roadblock for the incorporation of Ag flake ink into practical applications. In this work, a novel and inexpensive Ag flake/ion composite ink was prepared to directly achieve the thick conductive films with excellent performances at 100 °C. The effect of Ag ion content on the resistivity and microstructures of the modified conductive film was investigated, and the flexibility and relative resistance change of the modified conductive film were measured by the cyclic bending test and compared with the traditional Ag flake ink. Consequently, the modified conductive film sintered from Ag flake/ion-0.5 in. exhibits low electrical resistivity of 4.83 × 10 −5 Ω·cm, which is 42.9% lower than the Ag flake film sintered from the Ag flake ink, and the modified conductive film still displays smaller changes in resistivity and relative resistance after the cyclic bending tests. The enhanced conductivity and flexibility are attributed to the bridging effect of Ag nanoparticles (NPs) generated from the in–situ decomposition of Ag ion ink. These results demonstrate that the low-cost Ag flake/ion composite ink provides a tempting prospect for fabricating high-quality flexible printed electronics at low temperature.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
Nanoscale Advances
·
2018
·Vol. 1
·期 2
·840-848
·
IF 0
Xiaoxin Wang,Wuzhu Sun,Weiyi Yang,Shuang Gao,Caixia Sun,Qi Li
Ag is the most effective metal disinfectant against pathogenic microorganisms and thus, various approaches have been exploited to enhance the dispersity and control the release of Ag+ ions from Ag nanoparticles. In this study, a superparamagnetic Fe3O4@SiO2@Ag@porous SiO2 disinfectant with a double-layer core–shell structure was developed. Its superparamagnetic Fe3O4 nanosphere core ensured its good dispersity in water and allowed its easy magnetic separation after treatment. Its dense SiO2 inner shell protected the Fe3O4 nanosphere core and allowed a good loading of Ag nanoparticles. Its mesoporous SiO2 outer layer effectively protected the Ag nanoparticles from detachment, and its mesoporous channels resulted in lower silver oxidation and dissolution for the controlled release of Ag+ ions. Thus, a highly efficient, silver-based disinfectant was developed, as demonstrated by its effective disinfection of Escherichia coli bacteria with good recycle performance, while the silver concentration in the treated water met the MCL of silver for drinking water.
研究领域:
材料科学
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生物学
·
环境科学
✓ 已验证
DOI
PubMed
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Qian Wang,Tingting Luo,Xinyu Zhao,Hongjian Xu,Yao Yao,Shujie Yang,Ganggang Chang,Xiaoyu Yang
Tandem catalytic processes present a cost-effective and energy-efficient route for the generation of fine chemicals. In this work, a hierarchical multifunctional MOF (mesoAg+@Al-bpydc) was successfully synthesized using a simple impregnation method, with AgBF4 serving as both the functional sites and etching agents. The incorporated Ag+ ions and N-based ligands are accountable for the selective epoxidation and cycloaddition reaction, respectively. Moreover, the hierarchical pore structures within the mesoAg+@Al-bpydc are anticipated to optimize the mass transfer rate and enhance accessibility of active sites. These advantages synergistically contribute to superior catalytic performance of mesoAg+@Al-bpydc for the one-pot oxidative carboxylation of olefins (conversion ∼99.68%, selectivity ∼50.83%), where the yield of the target product over mesoAg+@Al-bpydc is at least 37% higher than that of microporous counterparts. Moreover, based on the kinetic results and the comparison between single-step reaction and tandem reaction, it was found that the intermediate styrene oxide (SO) is unstable and is easily converted to benzaldehyde (BA) with the extension of reaction time in the individual epoxidation reaction (78.22% selectivity of BA), while generated SO can immediately couple with CO2 to produce SC in the tandem reaction (6.81% selectivity of BA). Consequently, more SC is accessible by rapidly consuming SO and impeding the overoxidation reaction, which supports the preponderance of the direct oxidative carboxylation of styrene and the synergistic effect of varied active sites in the tandem reaction. Besides, the composite mesoAg+@Al-bpydc allows easy separation and recycling at least five times with a negligible loss of activity.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chunyan Ma,De-Kun Ma,Wenyuan Yu,Wei Chen,Shaoming Huang
Photoelectrochemical (PEC) water splitting that can mimic natural photosynthesis to directly harvest and convert solar energy into clean and sustainable hydrogen energy, has been known as a promising avenue for addressing environmental pollution and energy crisis. Spinel-type CuBi 2 O 4 semiconductor as a promising photocathode material for solar water reduction has attracted much attention because of its many unique advantages. However, PEC activity of pristine CuBi 2 O 4 is far from satisfying because of its poor charge carrier transport and transfer efficiency. Herein we report that Ag + ions and N-doped graphene quantum dots (NGQDs) co-modified CuBi 2 O 4 submicron rods (NGQDs/Ag-CBO SMRs) photocathode can show enhanced PEC activity. Our work demonstrated that one-dimensional structure, Ag + ions doping, and NGQDs loading benefited the separation and transfer of photogenerated carriers and improved light harvesting ability, which were collectively contributed to enhanced PEC activity of NGQDs/Ag-CBO SMRs photocathode. As a result, the photocurrent density achieved on NGQDs/Ag-CBO SMRs photocathode under AM1.5G simulated sunlight at 0.3 V vs. RHE was 8.8, 2.3, 1.8, and 5.9-times larger than those obtained on CBO SMRs, Ag-CBO SMRs, NGQDs/CBO SMRs, and NGQDs/Ag-CBO microspheres (MSs) ones, respectively. The present study provides a new strategy for designing low-cost and highly efficient photocathodes.
研究领域:
材料科学
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能源科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 35
·5768-5775
·
IF 3.117
Gongguo Zhang,Yanyun Ma,Feng Liu,Yuting Nie,Zhiang Liu,Xiaowei Fu,Xiaoqian Luan,Fengli Qu,Maochang Liu,Yiqun Zheng
We report the facile synthesis of gold–silver (Au–Ag) nanostructures in a niche hybrid form of ultrathin wire–dots, where the ultrathin nanowires are embedded with quasi-spherical dots along the longitudinal direction. The key to the success of this work relies on the use of seeded growth and the introduction of excessive Ag ions in the growth stage to facilitate the formation of such a unique architecture. Several reaction parameters, including the amount of silver and reductant, seed quantity and size/morphology, are systematically investigated to reveal their role in determining the morphology of the final products. We also recorded their UV-vis extinction spectra and compared them with pure ultrathin wires to investigate the effect of dot regions on the optical properties.
研究领域:
纳米材料
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化学合成
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光学特性研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2018
·Vol. 16
·期 1
·1-20
·
IF 5.294
Liu Menglong,He Danfeng,Yang Tao,Liu Wei,Mao Li,Zhu Yang,Wu Jun,Luo Gaoxing,Deng Jun
Background Silver and photothermal therapy (PTT) have been widely used for eradicating the drug-resistant bacteria. However, the risks of excess of silver for humans and the low efficiency of PTT still limit their in vivo therapeutic application. Integration of two distinctive bactericides into one entity is a promising platform to improve the efficiency of antimicrobial agents.Results In this study, a chemo-photothermal therapeutic platform based on polydopamine (PDA)-coated gold nanorods (GNRs) was developed. The PDA coating acquired high Ag+ ions loading efficiency and Cy5-SE fluorescent agent labeled glycol chitosan (GCS) conjugation (Ag+-GCS-PDA@GNRs). This platform became positively charged in the low pH environment of the abscess, allowing their accumulation in local infection site as revealed by thermal/florescence imaging. The loaded Ag+ ions was released in a pH-sensitive manner, resulting in selective Ag+ ions delivery to the abscess environment (pH ~ 6.3). More importantly, the ultralow dose of Ag+ ions could effectively damage the bacterial membrane, causing the permeability increase and the heat resistance reduction of the cell membrane, leading to the large improvement on bactericidal efficiency of PTT. On the other hand, the hyperthermia could trigger more Ag+ ions release, resulting in further improvement on bactericidal efficiency of chemotherapy. Combinational chemo-hyperthermia therapy of Ag+-GCS-PDA@GNRs could thoroughly ablate abscess and accelerate wound healing via a synergistic antibacterial effect.Conclusion sOur studies demonstrate that Ag+-GCS-PDA@GNRs is a robust and practical platform for use in chemo-thermal focal infection therapy with outstanding synergistic bacteria ablating.
研究领域:
纳米医学
·
抗菌治疗
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2018
·Vol. 14
·期 31
·1801680
·
IF 9.598
Jiangjiang Zhang,Wenshu Zheng,Xingyu Jiang
Chemical regulation of enzyme-mimic activity of nanomaterials is challenging because it requires a precise understanding of the surface chemistry and mechanism, and rationally designed applications. Herein, Ag + -gated peroxidase activity is demonstrated by successfully modulating surface chemistry of cetyltrimethylammonium bromide-capped gold nanoparticles (CTAB-AuNPs). A surface blocking effect of long-chain molecules on surfaces of AuNPs that inhibit peroxidase activity of AuNPs is found. Ag + ions can selectively bind on the surfaces of AuNPs and competitively destroy CTAB membrane forming Ag + @CTAB-AuNPs complexes to result in enhanced peroxidase activity. Ag + @CTAB-AuNPs show the highest peroxidase activity compared to similar-sized citrate-capped and ascorbic acid-capped AuNPs. Ag + @CTAB-AuNPs can potentially develop into analyte-responsive systems and exhibit advantages in the optical sensing field. For example, the Ag + @CTAB-AuNPs system shows an enhanced sensitivity and selectivity for acetylcholinesterase activity sensing compared to other methods.
研究领域:
纳米生物技术
·
分析化学
·
酶学
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生物传感器
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分子诊断
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转化医学
·
药物代谢
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tao Zheng,Zhenxiang Xu,Yong Zhao,Hongqi Li,Rong Jian,Congcong Lu
A spiropyran-appended polysiloxane ( SP-Si ) was synthesized and characterized. The photochromic SP-Si has good thermal stability and exhibits high fatigue resistance to light. SP-Si acts as a dual colorimetric and spectroscopic probe for determining multi-scale pH over a wide range of 1∼14, and for detection of Ag + and Fe 3+ ions. Based on the transformation from colorless SP-Si solution without absorption at 440 nm to brown SP-Si /Ag + showing extremely strong absorption at 440 nm by addition of Ag + ions and subsequent transformation from brown to colorless SP-Si /Ag + /Hg 2+ with very weak absorption at 440 nm after addition of 1 equivalent of Hg 2+ ions, SP-Si /Ag + system serves as a dual colorimetric and spectroscopic probe for highly selective and sensitive detection of Hg 2+ ions. The detection is not interfered by common competitive metal ions such as Na + , K + , Li + , Ni 2+ , Fe 2+ , Zn 2+ , Co 2+ , Sr 2+ , Cu 2+ , Al 3+ , Ce 3+ and Cr 3+ . Applicability of SP-Si for real water sample analysis has been proved.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）