Electronic Materials Letters
·
2015
·Vol. 11
·期 4
·702-706
·
IF 1.98
Han Wen-Song
In this manuscript, the third-generation hyperbranched polyester was synthesized with 2, 2-dimethylol propionic acid as AB 2 monomer and pentaerythrite as core molecule by using step by step polymerization process at first. Then, the Cu-Ag particles were prepared by co-reduction of silver nitrate and copper nitrate with ascorbic acid in the aqueous solution using hyperbranched polyester as template. Finally, the Cu-Ag@Ag particles were prepared by coating silver on the surface of Cu-Ag particles by reduction of silver nitrate. The synthesized hyperbranched polyester and Cu-Ag@Ag particles were characterized by Fourier transform infrared (FT-IR) spectroscopy, UV-vis spectra, x-ray diffraction, Laser light scattering, thermogravimetric analysis (TGA) and SEM. UV-vis spectra results showed that the Cu-Ag@Ag particles had a strong absorption band at around 420 nm. Laser light scattering and SEM studies confirmed that the most frequent particle sizes of Cu-Ag@Ag particles were 1.2 um. TGA results indicated that the Cu-Ag@Ag particles had good thermal stability.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2020
·Vol. 53
·期 19
·195403
·
IF 3.169
Shuping Liu,Liang Li,Rangtong Liu,Jingfang Liu,Xin Zhao,Xilin Liao
Flexibility, waterproof and breathability of substrates are the key issues restricting the application of electronic skin. Composite nanofibrous membranes (CNFMs) as substrates of electronic skin are prepared from polyvinylidene fluoride and silver nitrate blended solution by electrospinning technique. The microstructure and performances of the CNFMs are characterized by scanning electron microscopy, x-ray diffraction, capillary pore size analyzer, gravimetric method, water vapor permeability tester, optical contact angle tester, water permeability tester, intelligent electronic strength tester, hand-held electronic thickness meter and seveneasy conductivity meter. The results indicate that with the introduction of silver nitrate, the waterproof and breathability of CNFMs are balanced and optimized. The moisture permeability increases by 22%–69% from 2915.9 g · m−2 · 24 h−1 of pristine nanofibrous membrane (PNFM) to 3801.2–4151.5 g · m−2 · 24 h−1 of CNFMs and the hydraulic pressure decreases from 23.4 kPa to 21.6–16.5 kPa. However, the change of contact angle is irregular, which depends on the presence of like lotus-leaf-papillae morphology on fiber surface. The tensile strength of CNFMs decreases greatly and the elongation increases by 3–8 times from 7.7% of PNFM to 25.1%–63.2% of the CNFMs. The improvement of CNFMs flexibility is attributed to the hierarchical roughness of nanofiber surface, the unlock bonding between fibers and various combination forms of silver particles in CNFMs. Thus it was suitable to be applied as the substrate of electronic skin.
研究领域:
材料科学
·
生物医学工程
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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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 8
·6152-6158
·
IF 2.019
Wang Hua,Xing Wenjia,Chen Jing,Liu Guixiang,Xu Guangliang
In this work, dendritic silver nanostructure (DSN) was synthesized via a novel and eco-friendly method. The effects of the dosage of clove oil, concentration of silver nitrate and ultrasonic time on the formation of DSN were discussed. The structures of the obtained products were characterized by X-ray power diffraction, field emission scanning electron microscopy, transmission electron microscopy, and the chemical composition of DSN was examined by energy dispersive X-ray spectroscopy. The results show that the length of the trunks is approximately 2–5 μm and that of the lateral branches is about 0.5–2 μm. The conductive inks filled with dendritic silver and sphere silver powders were prepared respectively at mass fraction of 60%. The result shows that the coating of the conductive ink filled with dendritic silver has a lower sheet resistance of approximately 0.07 Ω/□ at a thickness of 20 μm.
研究领域:
材料科学
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纳米技术
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化学工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
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
MARINE ENVIRONMENTAL RESEARCH
·
2025
·
IF 3.2
Zimin Cai,Zihan Xing,Mingzhe Xu,Yuting Zhao,Lin Ye,Wei Sun,Ruijia Tao,Liuya Mi,Bowen Yang,Lei Wang,Yancui Zhao,Xiaoli Liu,Liping You
Silver nanoparticles (AgNPs) and Ag + ions are both detected in aquatic environments, posing potential risks to marine ecosystems. Mytilus galloprovincialis is an effective model for monitoring marine environments. In this study, AgNPs were synthesized using a chemical approach, and to distinguish the toxicological effects of AgNPs and AgNO 3 in M. galloprovincialis , experiments were conducted using various treatments (control, AgNO 3 , AgNPs, and AgNPs + cysteine). Our findings revealed that the uptake rate of AgNPs and AgNO 3 was different, they predominantly accumulated in the hepatopancreas and gills. qRT-PCR analysis showed varying degrees of alterations in immune genes of HSPA12A, TCTP, sHSP22, sHSP24.1 , P63, Bcl-2, and Ras . Histopathological analysis demonstrated disrupted epithelial cell arrangements and connective tissue damage in the hepatopancreas, with the AgNPs exhibiting the most severe damage compared to AgNO 3 . In addition, AgNPs significantly induced oxidative stress in hemocytes compared to AgNO 3 , resulting in elevated apoptosis rates. These findings contribute to a deeper understanding of the AgNPs and AgNO 3 interactions in marine environments and provide a theoretical basis for the evaluation of marine pollution and biomonitoring strategies.
研究领域:
海洋毒理学
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纳米毒理学
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环境科学
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分子生物学
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生态毒理学
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DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 12
·6831-6843
·
IF 6.123
Du Peng,Xu Yongjian,Shi Yun,Xu Qinghua,Li Shasha,Gao Minlan
With the improvement of medical and health care level in our society, the demand for antibacterial materials is increasing. In this work, we prepared the antibacterial materials by loading silver nanoparticles (AgNPs) on the dialdehyde cellulose (DAC) with in-situ synthesis method. DAC was prepared by pretreating cellulose fiber with sodium metaperiodate (NaIO 4 ) to convert the hydroxyl group into aldehyde group, and then reacted with silver nitrate (AgNO 3 ) to obtain AgNPs loaded on DAC. UV–Vis results show that the characteristic absorption peak of AgNPs at 428 nm appeared in the AgNPs-loaded-DAC. It was observed by SEM that the spherical AgNPs were distributed uniformly on the DAC surface without obvious flocculation. The color of DAC was not changed significantly, indicating that a small amount of AgNPs was loaded. In addition, sodium citrate (Na 3 C 6 H 5 O 7 ) was added in the reaction of DAC and AgNO 3 and its effect on the formation of AgNPs was studied. The results demonstrated that the color of DAC turned deeper and finally dark yellow with reaction time extended. When the reaction time was 60 h, the spherical AgNPs were gradually grown and transformed into triangular prism on the DAC surface. The antibacterial properties of AgNPs showed inhibition zones of 4.90 mm and 7.35 mm (60 h) against Gram-negative ( E. coli ) and Gram-positive ( S. aureus ), respectively, which increased by 40.00% and 14.85% compared with spherical AgNPs (2.5 h) obtained without Na 3 C 6 H 5 O 7 . The research of AgNPs-loaded cellulose-based materials promotes the development prospect of new nano-antibacterial materials. Graphical abstract
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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化学
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PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 10
·3209-3218
·
IF 6.177
Meng Tian,Jing Qian,Jiawei Hou,Yadi Bai,Hai-Ying Jiang,Jingyun Ren
Free silver ions (Ag+) in the solution exhibit enhanced photocatalytic dechlorination processes of organic chloride, including 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP), over copper phenylacetylene (PhC2Cu) under visible light irradiation. The concentration of AgNO3 remarkably affects the dechlorination activity of PhC2Cu. With the optimal concentration of 2 mM AgNO3, PhC2Cu showed the best photocatalytic performance, and the dechlorination rate of PhC2Cu was 2.3-fold enhanced under visible light irradiation for 80 minutes. This deep mechanism study demonstrated that free Ag+ in the solution, but not the deposited Ag particles on the surface of PhC2Cu, plays the most imported role in promoting the photocatalytic dechlorination process by forming the insoluble salt of AgCl.
研究领域:
环境科学
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化学工程
·
材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Ming-Kun Ke,Yuan Min,Shu-Chuan Mei,Hou-Wei Zeng,Zhao-Hua Wang,Tian-Wei Hua,Jie-Jie Chen,Gui-Xiang Huang,Han-Qing Yu
5-Hydroxymethyl-2-furancarboxylic acid (HMFCA) is an important feedstock in chemical and pharmaceutical industries . Its production through aerobic conversion of 5-hydroxymethylfurfural (5-HMF) has promising prospects but is challenged by the over-oxidation. In this work, we develop a refined Pt-Ag co-catalytic strategy to tailor the selectivity of 5-HMF’s aerobic oxidation. By simple in situ addition of AgNO 3 to the thermal catalytic system of Pt nanoparticles , the main products of 5-HMF oxidation could be shifted from 2,5-furandicarboxylic acid (FDCA) to HMFCA with an ultrahigh selectivity of over 99 %. Density functional theory calculations demonstrate that such strategy could alter the HMFCA adsorption sites from Pt to Ag sites and prevent the oxidation of hydroxymethyl group . In addition, this strategy can be extended to other Ag species, such as AgCl, Ag 2 O and AgO. This work provides insights into the Pt-Ag synergistic catalysis and opens up a simple avenue to control the product selectivity for biomass refinement.
研究领域:
催化
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化学工程
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材料科学
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计算化学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Shaohua Xu,Wenjun Ouyang,Peisi Xie,Yi Lin,Bin Qiu,Zhenyu Lin,Guonan Chen,Longhua Guo
Gold nanoparticles (AuNPs) have been frequently utilized for the construction of diverse colorimetric biosensors. Normally, AuNPs with sharp edges could have better sensitivity. However, the poor monodipersity of AuNPs with sharp edges seriously confines their utility for colorimetric biosensing. Herein, we demonstrate the utility of highly uniform gold nanobipyramids (Au NBPs) for ultrasensitive colorimetric detection of H5N1 virus. The proposed method is based on the fact that alkaline phosphatase (ALP) could catalyze the decomposition of 4-aminophenyl phosphate (4-APP) to generate 4-aminophenol (4-AP), which would then reduce silver nitrate to metal silver and then deposited on Au NBPs. The metal silver shell coated on the Au NBPs changed the refractive index of gold and thus resulted in a blue shift of longitudinal localized surface plasmon resonance (LSPR) and accompanied a vivid color change. This method exhibited a higher sensitivity than that of other Au NPs such as gold nanorods due to the high-index-faceted on the tips of the Au NBPs. This method was used to detect the activity of ALP. It exhibited a linear range of 0.1–5 mU/mL with a limit of detection (LOD) of 0.086 mU/mL. Finally, the proposed method was used in immunoassay to detect H5N1 virus. The results showed that the corresponding linear range for the detection of H5N1 virus antigen was 0.001–2.5 ng/mL, and the LOD was determined to be 1 pg/mL, which is more sensitive than those in most of the colorimetric biosensors reported previously.
研究领域:
纳米技术
·
生物传感器
·
病毒学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Optical Materials Express
·
2021
·Vol. 11
·期 5
·1504-1514
·
IF 3.442
Qingqing Zhang,Qingqing Zhang,Xueqin Wang,Xueqin Wang,Jinguo Jiang,Hen Yao,Qian Nie,Zhongchen Bai,Zhongchen Bai
We prepared an active large-area uniform Ag nanostructure film by using the thermally reducing polyvinyl alcohol (PVA)/silver nitrate (AgNO3) composite film for surface-enhanced Raman scattering (SERS) application. The PVA/AgNO3 composite films were spin-coated on the surface of indium tin oxide (ITO) glass, and then were heated to about 500 °C for 10 minutes, forming Ag nanostructure films with a thickness of 100 nm and a large area of 3.24 cm2. The results showed that single layer Ag nano-film had a network structure with a skeleton distribution. Moreover, the large ratio of Ag nanostructure to film area was about 63%. Using melamine molecules as a probe, the maximum enhancement factor of the SERS signal could reach 1149, and the SERS sensitivity and the minimum detection limit were respectively up to 76.91 and 3.85 ng/ml. This method of preparing SERS film can provide a new pathway for the application of low-cost and large-area SERS substrates.
研究领域:
材料科学
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纳米技术
·
分析化学
·
表面科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Feiya Fu,Jiayuan Gu,Jinfeng Cao,Rongsheng Shen,Hanxiang Liu,Yanyan Zhang,Xiangdong Liu,Jinping Zhou
This work proposed a straightforward and sustainable strategy to synthesize a Ag/ZnO decorated cellulose nanocomposite. First, zincate was introduced into an aqueous cellulose–NaOH/urea dope to enhance the solution stability. Second, AgNO3 was directly added into the cellulose dope without gelation, and then was reduced into Ag NPs by cellulose chain. Finally, zincate transformed into ZnO via biomimetic mineralization along with the regeneration of the cellulose dope, and an Ag/ZnO decorated cellulose nanocomposite film was synthesized. The Ag NPs with a mean diameter of 16.5 nm were well dispersed in the cellulose matrix, and some were doped on the surface of the embedded ZnO crystal. With increase of the Ag loading, the nanocomposite film showed more rapid sterilization for Escherichia coli than Staphylococcus aureus, and complete eradication could be achieved within 3 h for both bacteria. This simple and environmental friendly method hopefully provided new routes for large-scale production of antibacterial cellulose-based nanohybrids in industry.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）