JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 1
·380-391
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IF 3.553
Hou Ying,Nie Bei
Abstract With an in situ synthesized AgNO 3 complex molecular cage, icosahedral C 60 can be selectively extracted from fullerene mixture by a facial liquid–liquid interfacial precipitation, resulting in exclusive C 60 organometallic microcrystal (C 60 /C 70 = 6/1). By exploiting its intrinsic insolubility against nonpolar solvent, the C 60 can be separated from the homologues, C 70 , which contrarily is assembled through merely hydrophobic interaction and π-π stacking. The AgNO 3 complex encaged C 60 crystal was morphologically and structurally characterized by SEM, Raman and XRD spectra to revealing the underlying separation mechanism. The selective extraction efficiency (89.7%) was semiquantitatively characterized by combined optical spectroscopy and mass spectrometry, indicating a decent specificity of spontaneously formed molecular cage toward C 60 extraction. Thus, this discovery of a template-specific molecular cavity would pave the way to advance molecular imprinting technology using supramolecular array for fullerene separation, prevailing over the conventional “design-synthesis-performance” strategy by substantially reducing the laborious work and economic cost. Graphic abstract
研究领域:
化学
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材料科学
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 12
·e5978
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IF 3.14
Ying Hou,Yinxu Pan,Chunhong Dong,Bei Nie
We observed the unusual crystal transformation from solid AgNO 3 to Ag(I)-encapsulated fullerene (C 60 ) microcrystal by a coordination-driven crystallization, when casting C 60 solution on AgNO 3 crystal. The strong binding of Ag + -C 60 ruptures electrostatic interactions within AgNO 3 lattice, forming a binary hybrid material, which was characterized by XRD, Raman spectroscopy and mass spectrometry. Our results support the fact that AgNO 3 crystal can directly interact with fullerene C 60 molecules, other than through solvated metal cations. Two major factors, namely sturdy Ag + -olefin interaction and an enclosed cage effect play the dominating roles in crystal transformation. Adding to the regular solution-based crystallization, this facial protocol is expected to render an additional dimension in fabrication of exohedral metallofullerene architecture, regardless of solubility of metal cation in anti-solvent.
研究领域:
材料科学
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化学
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DOI
高影响因子
VIBRATIONAL SPECTROSCOPY
·
2020
·
IF 1.917
Ying Hou,Bei Nie,Zhe Li
Ag + -fullerene (C 60 ) hybrid microcrystal is synthesized by a liquid-liquid interfacial precipitation, which shows the broadened and weakened Raman bands , relative to original C 60 monomers . Our experimental results, combined with numerical calculation implicate that charge transfer and overlap orbitals between Ag + and C 60 steered this dramatic change of Raman response, due to greatly reduced molecular symmetry and redistributed electron density. Density functional theory (DFT) calculations rationalize the degenerated Raman spectra of Ag + -exohedral fullerene conjugate through ƞ 1 (C1-top) and ƞ 2 (C2-bridge) sites, elucidating that the binding nature (π-5 s and d-π*) shifts partially from electrostatic to covalent bond . This study is expected to render a general and easily accessible Raman approach in deciphering transition metal ion-fullerene interactions.
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Cheng Zhao,Shixiang Zhou,Jie Ma,Cong Liu,Jiading Zhu,Shi-Fang Ye,Zhe Xin,Jiantao Cai,Peizhong Feng,Xueyu Tao
High electronic conductivity and excellent specific capacitance still remain challenge for the practical application of hydrogel electrodes. Herein, a novel polymer composite hydrogel electrode, PANI/PVA/ATMP/Ag (PPA-Ag), has been successfully constructed through in situ polymerization of aniline (ANI) in solution of polyvinyl alcohol (PVA), amino trimethylene phosphonic acid (ATMP) and silver nitrate (AgNO3). The incorporation of AgNO3 is expected to enhance the electronic conductivity and excellent specific capacitance of PPA hydrogel electrodes. The AgNO3 incorporated PPA-Ag hydrogel electrode exhibited a superior specific capacitance (510 F g-1 at 0.5 A g-1), which was much higher than the pristine one without introducing AgNO3 (317 F g-1 at 0.5 A g-1). Additionally, the PPA-Ag hydrogel electrode also showed excellent flexibility (93.43% capacitance retention after 200 cycles of bending) and excellent cyclic stability (81.41 % of initial capacitance after 10000 cycles). The energy storage mechanism originated from the three-dimensional porous structure of hydrogel, the multiple redox structures of polyaniline and the Ag+/Ag of silver nitrate. The all-hydrogel-state supercapacitor was assembled based on the PPA-Ag hydrogel electrode, which delivered a high energy density of 13.3 W h kg-1 at a power density of 125 W kg-1. Meanwhile, the supercapacitors can also maintain above 77% of the initial capacitance after 10000 charge-discharge cycles. This work constructed polymer hydrogel electrodes with high electronic conductivity and excellent specific capacitance for flexible supercapacitors, which demonstrated the great potential within the field of flexible energy storage.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
SAUDI JOURNAL OF BIOLOGICAL SCIENCES
·
2022
·
IF 4.052
Samaira Mumtaz,Shaukat Ali,Asim Pervaiz,Muhammad Zahid Qureshi,Kinzah Kanwal,Talha Saleem
Bombyx mori silk sericin is a globular-like protein that is used as an antioxidant, antibacterial, and antitumor agent. In this current research, we isolated sericin by degumming process and formation of sericin-AgNO 3 NPs confirmed by UV–vis spectra, SEM, EDX, FTIR, and XRD patterns. The sericin and sericin-AgNO 3 NPs mediated changes in human breast cancer cells were determined. The antiproliferative activity of sericin-AgNO 3 NPs was analyzed by MTT dye reduction assay. Alterations at molecular levels were investigated by qRT-PCR, while apoptotic effects were studied by nuclear DNA staining. After 72 h treatment, sericin and sericin-AgNO 3 NPs showed significant antiproliferative effects in MDA-MB-231 (26 %) and MCF-7 (41 %) cells. Expression modification showed prominent stimulation of cell cycle arrest and stress related genes such as cyclin-dependent kinase inhibitors (CDKN1A, CDKN1B), and GADD family genes. RT-PCR results of the GADD family include GADD45A, B, G, 34, 153 and cyclin-dependent kinase inhibitors (CDKN1A, 1B) showed pronounced induction of 3.1 to 19.8-folds in MCF-7 cell line while induction in MDA-MB-231 cell line was 2.5 to 34.3-folds. Nuclear DAPI staining showed significant induction of apoptosis and nuclear fragmentation in MDA-MB-231 cells at a concentration of 1 mg/mL for both sericin and sericin-AgNO 3 NPs. Meanwhile, in case of MCF-7 cells, after treatment with sericin and sericin-AgNO 3 NPs (1 mg/mL), the cells changed into a round shape and lost their original spindle outlook in dose-dependent manners. We concluded that sericin-AgNO 3 NPs have significant antiproliferative, apoptosis, and genetic profiling effects in both breast cancer cell lines at the highest concentration.
研究领域:
生物化学
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肿瘤学
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纳米医学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yong-Jun Yuan,Zhi-Kai Shen,Pei Wang,Zijian Li,Lang Pei,Jiasong Zhong,Zhenguo Ji,Zhen-Tao Yu,Zhigang Zou
Exploiting highly-efficient, broad-spectrum responsive and noble-metal-free water oxidation photocatalyst is a major challenge in the field of photocatalysis. Herein, we tackle this challenge by synthesizing Z-scheme PTCDA/g-C 3 N 4 photocatalysts, which can absorb light with wavelength short than 600 nm, for visible light photocatalytic O 2 production from water. Owing to the evident conduction and valance band energy level difference between PTCDA and g-C 3 N 4 , the PTCDA/g-C 3 N 4 photocatalysts exhibit efficient charge carrier separation through a Z-scheme mechanism, as demonstrated by the transient photocurrent responses and time-resolved fluorescence decay spectra analysis. Benefitting from the synergetic effect of the broad visible light absorption capacity and efficient charge separation, the optimized PTCDA/g-C 3 N 4 photocatalyst shows the highest O 2 evolution rate of 847 μmol·h −1 ·g −1 under visible light irradiation in the presence of Co 3 O 4 as a cocatalyst and AgNO 3 as the sacrificial reagent. An apparent quantum yield of 4.5% was achieved under monochromatic light irradiation at 420 nm.
研究领域:
光催化
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材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2020
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IF 7.888
Minchen Du,Yanyan Gong,Chao Bu,Jia Hu,Yongxing Zhang,Cheng Chen,Somboon Chaemchuen,Ye Yuan,Francis Verpoort
Oxazolidinones and α-hydroxyl ketones are two series of fine chemicals that have been generally utilized in biological, pharmaceutical, and synthetic chemistry. Herein, a AgNO 3 /ionic liquid (IL) catalytic system was developed for the simultaneous synthesis of these compounds through the atom-economical three-component reactions of propargyl alcohols, 2-aminoethanols, and CO 2 . Notably, this system behaved excellent catalytic activity with the lowermost metal loading of 0.25 mol%. Meanwhile, it is the first reported metal-catalyzed system that could efficiently work under atmospheric CO 2 pressure and be recycled at least five times. Evaluation of the green metrics proved the AgNO 3 /IL-catalyzed processes to be relatively more sustainable and greener than the other Ag-catalyzed examples. Further mechanistic investigations revealed the derivative active species of N-heterocyclic carbene (NHC) silver complexes and CO 2 adducts generated during the process. Subsequently, their reactivity in this reaction was assessed for the first time, which was finally identified as beneficial for the catalytic activity.
研究领域:
催化
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绿色化学
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有机合成
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2018
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IF 6.653
Dong Zhu,Fei Zheng,Qing-Lin Chen,Xiao-Ru Yang,Peter Christie,Xin Ke,Yong-Guan Zhu
Gut microbiota contribute to host health. Numerous recent studies have focused on the survival and reproduction of nontarget soil animals exposed to the toxicity of silver nanoparticles (AgNPs) but changes in the gut microbiota due to nanoparticle toxicity are largely unknown. Here, we examine some effects of AgNPs and silver nitrate (ionic Ag) on the gut microbiota of the common soil collembolan Folsomia candida using Illumina sequencing and concomitant changes in antibiotic resistance genes (ARGs) of the gut microbiota using high-throughput quantitative PCR. A large number of Ag accumulated in Ag-exposed individuals after 28 days and ionic Ag significantly inhibited the reproduction of the collembolan (by 19.3%). Exposure to AgNPs disturbed the composition of the collembolan gut bacterial community, resulting in dysbiosis of the gut microbiota. However, the dominant microbiota was shared among different treatments. In addition, AgNPs exposure did indeed reduce the incidence of ARGs in the collembolan gut microbiota. A weak relationship was identified between gut bacterial communities and ARG profiles. These results extend our knowledge regarding the role of the gut microbiota in assessing the soil ecotoxicology of AgNPs.
研究领域:
环境科学
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微生物学
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生态毒理学
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DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2018
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IF 2.873
Aijun Cai,Aiying Guo,Liqaing Du,Yanling Qi,Xiuping Wang
In this paper, poplar leaf is used as a template to synthesize hierarchical AgCl-Ag-ZnO composites via a calcination method. Zn(NO 3 ) 2 and AgNO 3 are selected as precursors. During the calcination of the templates, Zn 2+ ions react with oxygen to produce ZnO nanoparticles (NPs), Cl − ions in leaf cells combine with the external Ag + ions to form AgCl, and Ag + ions are reduced by reducing agents in leaf to Ag NPs. The morphology, structure and visible-light response of the as-prepared hierarchical AgCl-Ag-ZnO composites are determined. The composites exhibit a strong photocatalytic activity toward the degradation of Rhodamine B (RhB) under visible-light irradiation. The AgCl-Ag-ZnO composites display an enhanced photocatalytic activity, compared with the leaf-templated AgCl-Ag and ZnO. A photocatalytic mechanism is proposed, based on the efficient separation of photoexcited electron-hole pairs due to the surface plasmon resonance (SPR) effect of metal Ag.
研究领域:
材料科学
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化学
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环境科学
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125101
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IF 3.551
Jingchen Li,Jie Zheng,Yadong Yu,Zhen Su,Lihui Zhang,Xiaojun Chen
The abuse of antibiotics has led to the emergence of numerous super resistant bacteria, which pose a serious threat to public health. Developing nanomaterials with novel modes of bactericidal activity offers the promise of fighting pathogens without the risk of causing drug resistances. Here, we used reduced graphene oxide (rGO), bulk molybdenum disulfide (MoS2) and silver nitrate (AgNO3) to synthesize a ternary nanocomposite, rGO–MoS2–Ag, via a simple one-pot method. The resulting rGO–MoS2–Ag presented as crumpled and sheet-like structures decorated with Ag nanoparticles. The minimum inhibitory concentration and minimum bactericidal concentration of rGO–MoS2–Ag against Escherichia coli were 50 and 100 μg ml−1, while Staphylococcus aureus reacted only to twice higher concentrations of 100 and 200 μg ml−1, respectively. Notably, rGO–MoS2–Ag exhibited better antibacterial activity towards E. coli and S. aureus than rGO, MoS2, or rGO–MoS2. This result can be attributed to the excellent performance of rGO–MoS2–Ag in destroying the bacterial cell membrane and inducing the generation of reactive oxygen species. The Ag+ ion release of rGO–MoS2–Ag was delayed, endowing the nanocomposite with long-term antibacterial capabilities and better biosafety. Our results indicate that the as-prepared rGO–MoS2–Ag has promising potential for application in biomedicine and public health.
研究领域:
材料科学
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纳米技术
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生物医学工程
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微生物学
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DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 19
·3549-3556
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IF 3.545
Yuan Lin,Huijie Jiang,Guangling Liang,Wei-Hua Deng,Qiaohong Li,Wen-Hua Li,Gang Xu
A new conductive coordination polymer (CCP), Ag(SPh–NO2)·AgNO3, with a three-dimensional (3D) non-porous structure composed of a unique 2D inorganic layered structure linked by an organic linker, was reported. The 3D CCP Ag(SPh–NO2)·AgNO3 exhibits semiconductor behavior, with electronic conductivity as high as 2.7 × 10−6 S cm−1 at 295 K, which is comparable to the vast majority of highly conductive 3D coordination polymers. The chemiresistive humidity sensing ability of Ag(SPh–NO2)·AgNO3 was studied over a wide relative humidity (RH) range (10–90% RH) at room temperature. The sensor showed exceptionally high moisture responsiveness, with a 106-fold increase in response at 90% RH and excellent sensitivity to humidity in the range of 10–80% RH. The sensing mechanism was further studied using alternating current (AC) impedance spectroscopy and direct current (DC) instantaneous reverse polarity experiments. The exceptionally high response of the Ag(SPh–NO2)·AgNO3-based sensor at high RH is attributed to the periodic arrangement of the ion species via reversible coordination bonds in the structure. H3O+ and Ag+ are easily formed on its hydrophilic surface, through which the free transport of ionic carriers dominates the conductivity change. Using density functional theory (DFT) calculations, it is further demonstrated that the reversibly coordinated AgNO3 in the structure can be easily occupied by water molecules, which is thermodynamically spontaneous in the presence of humidity. Furthermore, the functional AgNO3 groups and their reversible coordination bonds enabled Ag(SPh–NO2)·AgNO3 to show exceptionally high moisture responsiveness.
研究领域:
材料科学
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化学
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传感器
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电化学
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计算化学
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 55
·34516-34524
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IF 3.361
Qi Zhang,Tian-Song Deng,Ming-Zhang Wei,Xi Chen,Zhiqun Cheng,Shiqi Li,Yi-Jie Gu
The plasmonic properties of noble metallic nanoparticles could be tuned by morphology and composition, enabling opportunities for applications in sensors, photocatalysis, biomedicine, and energy conversion. Here, we report a method of the symmetric and asymmetric overgrowth of a Ag shell onto gold nanorods assisted by Pt pre-deposition via a 2-step approach. Firstly, gold nanorods (AuNRs), synthesized via a seed-mediated method, were used as seeds to form a AuNR–Pt structure, by using K2PtCl4 as the precursor. In this step, most of the Pt material was selectively deposited on the tips of the AuNR. Secondly, by using AgNO3 as the precursor, a Ag shell was overgrown on the surface of the AuNRs–Pt nanoparticles, resulting in a (AuNR–Pt)–Ag core–shell tri-metallic nanostructure. Due to the surface energy and lattice matching between Au and Ag, the Ag shell preferred to be epitaxially overgrown on the side of AuNR. The Ag shell thickness and symmetry of the (AuNR–Pt)–Ag could be tuned by changing the amounts of AgNO3 precursor. With the increase of the Ag shell thickness, the (AuNR–Pt)–Ag nanostructures changed from symmetric to asymmetric. The obtained (AuNR–Pt)–Ag nanostructures were studied using UV-vis-NIR spectroscopy, transmission electron microscopy, EDS mapping, DLS, and ICP-MS. The growth mechanism was discussed.
研究领域:
纳米技术
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材料科学
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化学
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物理
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生物医学工程
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DOI
PubMed
高影响因子
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