DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Qin Wu,Yingchen Kang,Zhenhao Tang,Lujun Cui,Xuechun Yan,Zhongjin Ni
Paraffin wax (PW), despite being an excellent energy storage material, suffers from limited applications due to its low thermal conductivity and propensity for liquid-phase leakage. In this study, PW is employed as the phase change material (PCM), expanded graphite (EG) serves as the support material, and silver nanoparticles function as additives to enhance thermal conductivity. Silver-modified expanded graphite (Ag@EG) is synthesized through a liquid-phase reduction process. Subsequently, composite PCMs of Ag@EG/PW with varying mass ratios, which exhibit high thermal conductivity and stability, are fabricated via a vacuum impregnation method. Characterization techniques, including SEM, FTIR, XPS, and SEM-EDX, confirm the existence of Ag in EG in the form of well-dispersed elemental silver. XRD analysis demonstrates the favorable chemical compatibility of the composite PCMs. The prepared composite PCMs all possess a latent heat exceeding 110 J/g. Specifically, the thermal conductivity of the 1wt%Ag@10wt%EG/PW composite PCMs reaches 0.989 W/(m·K), representing a 292.5 % enhancement compared to PW. Additionally, this composite material exhibits excellent thermal cycling stability, anti-leakage properties, and temperature responsiveness. In conclusion, this research is expected to pave the way for the application of Ag@EG/PW composite PCMs in fields where high temperature sensitivity is required.
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产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 3
·480
·
IF 4.034
Xiaozhen Feng,Chongning Li,Aihui Liang,Yanghe Luo,Zhiliang Jiang
The as-prepared co-doped N/Ag carbon dot (CDNAg) has strong catalysis of H2O2oxidation of 3,3′-dimethylbiphenyl-4,4′-diamine (DBD). It forms an oxidation product (DBDox) with surface-enhanced Raman scattering (SERS) activity at 1605 cm−1in the silver nanosol substrate, and a CDNAgcatalytic amplification with SERS analytical platform can be structured based on aptamer (Apt) with the DBD oxidizing reaction. For example, the aptamer (Apt) of acetamiprid (ACT) can be adsorbed on the surface of CDNAg, resulting in inhibited catalytic activity, the reduced generation of DBDox, and a weakened SERS intensity. When the target molecule ACT was added, it formed a stable Apt-ACT complex and free CDNAgthat restored catalytic activity and linearly enhanced the SERS signal. Based on this, we proposed a new quantitative SERS analysis method for the determination of 0.01–1.5 μg ACT with a detection limit of 0.006 μg/L.Keywords:acetamiprid;aptamer;carbon dot catalytic;DBD;SERS
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DOI
PubMed
高影响因子
JOURNAL OF FOOD PROTECTION
·
2021
·
IF 2.077
Bing Han,Xiaoyu Han,Mengmeng Ren,Yilin You,Jicheng Zhan,Weidong Huang
ABSTRACT Diseases caused by harmful microorganisms pose a serious threat to human health. Safe and environmentally friendly disinfectants are, therefore, essential in preventing and controlling such pathogens. This study aimed to investigate the antimicrobial activity and mechanism of a novel hydrogen peroxide and silver (H 2 O 2 -Ag + ) complex (HSC) in combatting Staphylococcus aureus ATCC 29213, Escherichia coli O157:H7 NCTC 12900, and Salmonella Typhimurium SL 1344. The MICs and MBCs against S. aureus were found to be 0.014% H 2 O 2 –3.125 mg/L Ag + , and for both E. coli O157:H7 and Salmonella Typhimurium they were 0.028% H 2 O 2 –6.25 mg/L Ag + . Results of the time-kill trial suggest that HSC could inhibit the growth of the tested bacteria, because 99.9% of viable cells were killed following treatment at 1 MIC for 3 h. The mechanism of antibacterial action of HSC was found to include the disruption of the bacterial cell membrane, followed by reduction of intracellular ATP concentration and inhibition of the activity of antioxidases, superoxide dismutase, and catalase. The enhanced bactericidal effect of hydrogen peroxide combined with silver indicates a potential for its application in environmental disinfection, particularly in the food industry.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xiao-Shuai Zhang,Jian-Shuang Wei,Jian-Wei Chen,Kai Cheng,Fang Zhang,Ghazal Ashraf,Yan Li,Xiao-Lin Hou,Ruo-Yun Zhang,Yong-Guo Hu,Xiao-Quan Yang,Wei Chen,Bo Liu,Yuan-Di Zhao
In this study, a hollow Ag 2 S/Ag nanocomposite shell comprised of elemental Ag and compound Ag 2 S was synthesized, after loading the sonosensitizer and CT contrast agent, a multifunctional HASAIC nanoprobe was obtained for the first time by wrapping it with a thermosensitively supported lipid bilayer. The elemental Ag in the probe can catalyze H 2 O 2 to O 2 to relieve the hypoxic environment at the tumor site and improve the effect of sonodynamic therapy. Moreover, the hollow Ag 2 S/Ag nanocomposite shell avoids the key limitation of pure Ag shell during the process of catalyzing H 2 O 2 to O 2 , the pure Ag shell will dissolve and could not be used for photothermal therapy (PTT) and photoacoustic imaging (PAI), and enables the probe to use stable Ag 2 S to employ PTT and PAI though solving the problem of hypoxia. The synergy combination of the nano size (70 nm) HASAIC probe, low cytotoxicity, good safety, and high biocompatibility boost up the tumor killing capability. Because of the high efficiency, the HASAIC nanoprobe has been employed for real-time ( in vitro and in vivo) CT and PAI imaging in a 4T1 tumor-bearing mouse. Laser and ultrasound irradiation demonstrated a higher survival rate of HASAIC-injected mice compared to a probe without elemental silver, thereby indicating the high efficiency of our diagnosis and treatment probe.
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DOI
高影响因子
SOLAR ENERGY
·
2024
·
IF 6
Junhan Xu,Binghong Chen,Kunpeng Yuan,Jun Shu,Qiguo Yang
Ag@SiO 2 nanofluid is widely used in spectral splitting PV/T system. Its core–shell structure has great influence on the optical properties. In this work, we focus on the comprehensive analysis and structure optimization of Ag@SiO 2 nanofluid to achieve its optimal spectral performance. DDA method is used to predict the optical properties of Ag@SiO 2 nanofluid and an optimization model based on filter efficiency is proposed. The effect of the SiO 2 shell thickness and Ag core mass concentration is analyzed. It indicates that the spectral performance of Ag@SiO 2 nanofluid can be improved with SiO 2 shell thickness of 15–40 nm and Ag core mass concentration of 81–135 mg/L. To achieve the same theoretical merit function of 1.46, the usage of Ag mass can be reduced by 25/33/44/62 % with SiO 2 coating of 10/20/40/70 nm. The optimal structure to achieve the highest filter efficiency η of 37.8 % is with a shell thickness of 20 nm and a mass concentration of 113.9 mg/L. An indoor PV/T operation testing is conducted to verify the optimization results. The merit function of Ag-based nanofluids increases from 1.58 to 1.598 and a reduction in Ag usage of 17 % is achieved with a SiO 2 coating shell of 17.8 nm. Operation stability is also enhanced with no aggregation observed during the working cycle and 7-day static experiment.
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DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2019
·Vol. 50
·期 11
·1679-1690
·
IF 2.809
Hang Zhao,Wuliji Hasi,Nan Li,Xuanyu Sha,Siqingaowa Han
This paper reports a “bottom-up” substrate preparation method using a two-phase interface self-assembly technology that combines silver-coated gold core–shell nanorods with the thermally shrinkable polystyrene (TSP) support material for surface-enhanced Raman spectroscopy (SERS), that is, TSP-SERS substrate. The gold nanorods with long absorption wavelength were used as the core, and the silver shells were coated to obtain the core–shell nanostructures with a stronger resonance with the wavelength of the light source. The density of the nanostructures and numbers of “hot spots” within the light spot increased via the three-dimensional folding feature formed by thermal shrinkage. The combined effect of the two factors increases the enhancement factor by an order of magnitude to 10 7 after thermal contraction. The detection concentration of 4-mercaptobenzoic acid can reach 10 −9 M, and the maximum relative standard deviation is only 8.9%. In fact, the detection limit of benzimidazole on the surface of apple can reach 0.5 mg/L, and the recovery deviation is controlled within the range of 11.7%. The practical detection of benzimidazole pesticide residues showed that this method has wide application prospects in the detection of pesticide residues.
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2018
·Vol. 51
·期 16
·165306
·
IF 2.373
Xianzhu Ye,Ming Li,Yafei Zhang
The wide development of electronic materials requires higher load capacity and high temperature resistance. In this study, a novel architecture was fabricated consisting of a 3D reduced graphene oxide (rGO)-Si interface using a simple nano-assembly sintering to achieve high current capacity and excellent thermal features. Via the analysis of catalytic oxidation for methanol, the loading catalytic activity of nano-Ag still remained to a certain extent for the composite with 0.8 vol.% rGO. The final Ag-rGO composite apparently possesses a higher initial oxidation temperature and lower rate of oxidation for internal passing and shielding, and the thermal conductivity is significantly enhanced from 344 to 407 W m−1 K−1. Importantly, with a 3D synergistic transportation network, the resistivity of the Ag-rGO composite is much lower than pure Ag, and with a longer conductive time under a stress condition of current density of 6.0 × 104 A cm−2. Thermal-electronic features demonstrate that the dispersed graphene interface can efficiently suppress the primary failure pathways (high temperature) in Ag matrix and make it uniquely efficient for the advancement of microscale and thermal-management electronics.
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2011
·
IF 5.361
Xiaochun Jiang,Kun Chen,Heyou Han
A novel electrochemical biosensor was developed for detecting short DNA oligonucleotide of Bacillus thuringiensis (Bt) transgenic sequence based on Ag nanoparticle aggregates. To fabricate this DNA biosensor, the thiol-modified capture DNA (cDNA) was first anchored on gold (Au) electrode, and then the target DNA (tDNA) was hybridized with the immobilized cDNA. Subsequently, the probe DNA (pDNA) functionalized by biotinylated Ag nanoparticle was associated with the fixed tDNA, and the single Ag nanoparticle label was obtained (cited as SAg label). Finally, dissociative biotinylated Ag nanoparticle was bound to the resultant biotinylated SAg label assembled on Au electrode by virtue of bridge molecule streptavidin (SA) through biotin–SA specific interaction, which could lead to in situ aggregate of Ag nanoparticles on Au electrode and induce a novel tag including multiple Ag nanoparticles (cited as MAg tag). The novel tag exhibited excellent electroactive property in the solid-state Ag/AgCl process and was successfully applied to Bt transgenic sequence assay. A detection limit of 10 fM was achieved, which was improved by three orders of magnitude as compared to the SAg label. Furthermore, this novel DNA biosensor demonstrated a good selectivity towards tDNA.
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DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2021
·Vol. 53
·期 2
·211-221
·
IF 3.133
Nan Jia,Yinran Xiong,Ying Wang,Siqian Lu,Ruoqiu Zhang,Yan Kang,Yiping Du
A label-free and novel surface-enhanced Raman scattering (SERS) method has been studied to rapidly detect common fish pathogenic bacteria ( Escherichia coli , Vibrio anguillarum , Vibrio harveyi , Edwardsiella piscicida , and Pseudomonas plecoglossicida ). The marriage of magnetic nanospheres (Fe 3 O 4 ) with polyethylenimine (PEI) could trigger surface charge modifications of Fe 3 O 4 , making it effective to capture negatively charged bacteria. After the rapid bacterial capture procedure within 10 min, Au@Ag core-shell bimetallic nanoparticles served as hotspot providers to facilitate the enhancement of biological Raman signals. The results demonstrated that the minimum detection limit of E. piscicida could be as low as 10 5 cfu/ml. The peak intensity at 1628 cm −1 ( E. piscicida ) showed a linear relationship with the logarithm of the bacterial concentration ( R 2 = 0.997). A mimic test was conducted by spiking E. piscicida into tap water. Linear discriminant analysis (LDA) was also harnessed to classify different types of fish bacteria. And the positive rates of the training set and the prediction set were 100% and 80%, respectively. The whole experimental procedure only takes 20 min. This method opens a new avenue for the rapid detection and identification of fish pathogenic bacteria.
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DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 25
·8879-8888
·
IF 7.367
Xiu Liang,Yi-Shuo Wang,Ting-Ting You,Xiao-Juan Zhang,Nan Yang,Guang-Sheng Wang,Peng-Gang Yin
Interfacial self-assembly of ordered nanostructures at oil–water interfaces towards the fabrication of nanofilms has attracted the interest of plenty of scientists, since its discovery in 2004. Herein, further developments have been achieved, and we report a new strategy for the synthesis of a three-dimensional (3D) hierarchical nanostructure, through an interfacial synthesis driven microemulsion process. Thus, the synthesis route has been simplified, with the rigorous experimental conditions of traditional compositing technology. Combined with a two-step seed-mediated growth method for preparing uniform Ag-NPs, a plasmonic 3D MoS2-NS@Ag-NP nanostructure was successfully developed as a Surface-Enhanced Raman Scattering (SERS) active substrate, with plenty of surface hot spots, leading to an enhancement factor (EF) of 1.2 × 108 derived from both electromagnetic mechanism (EM) and chemical mechanism (CM) effects. The 3D MoS2-NS@Ag-NP nanostructure can be applied to detect trace thiram in apple juice and local lake water, with a detection limit as low as 10 ppb (42 nM), which is much lower than the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). Furthermore, quantitative analysis was achieved in the range of 10 ppb–1 ppm with good homogeneity and selectivity.
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DOI
高影响因子
ACS Applied Bio Materials
·
2021
·
IF 0
Menghui Wan,Haodong Zhao,Lichao Peng,Yanbao Zhao,Lei Sun
The fabrication of highly active and free-standing surface-enhanced Raman scattering (SERS) substrates in a simple and low-cost manner has been a crucial and urgent challenge in recent years. Herein, SiO2 nanofiber substrates modified with size-tunable Ag nanoparticles were prepared by the combination of electrospinning and in situ chemical reduction. The results demonstrate the presence and uniform adsorption of Ag nanoparticles on the SiO2 matrix surface. The free-standing composite nanofibrous substrates show high-performance SERS response toward 4-mercaptophenol and 4-mercaptobenzoic acid, and the detection limit can be as low as 10–10 mol/L. Most importantly, the as-prepared substrate as a versatile SERS platform can realize label-free detection of bio-macromolecules of bacteria, i.e., Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). Furthermore, the substrates also possess outstanding antibacterial activities against S. aureus and E. coli. Briefly, the significance of this study is that size-tunable Ag nanoparticles can be decorated on SiO2 nanofiber surfaces with triethanolamine as a bridging and reducing agent through a one-pot reaction, and the as-prepared nanofibrous membranes are expected to act as a candidate for label-free SERS detection as well as antibacterial dressing.
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yukun Gao,Chenmeng Zhang,Yunxia Yang,Nan Yang,Sichen Lu,Tingting You,Penggang Yin
A high sensitive micro/nano-structured glucose sensor via Surface Enhanced Raman Spectroscopy (SERS) detection and electrochemical analysis was developed in this work. Ag nanodendrites/Cu mesh substrate were prepared through facile electrochemical deposition method, which exhibited high SERS sensitivity and electrocatalytic activity . By SERS measurements, glucose can be detected as low as 0.005 mM and exhibit a good linear relationship between concentrations (0.5–5 mM) and the SERS intensities. Moreover, glucose in human urine with different concentrations were successfully detected by the substates. By electrochemical method, the conductivity was firstly tested by CV and ESI tests. Amperometric responses of 0.5 mM glucose were compared with Cu mesh electrode, and the Ag nanodendrites/Cu mesh electrode showed higher electrochemical detection sensitivity. Results revealed the Ag nanodendrites/Cu mesh substrate can be used as glucose sensor with high detection sensitivity, reproducibility, selectivity and practicability, which has great potential in noninvasive medical diagnosis in further works.
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高影响因子
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