COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Zhihua Li,Yuan Zhao,Shi Li,Yuanyuan Tu,Zhenzhu Huang,Shudong Lin,Liangzhi Hong,Jiwen Hu
Due to their unique properties, raspberry-like colloidal particles (RCPs) have been widely used in various fields. However, a facile, scalable and robust approach of producing raspberry-like colloidal particles remains an ongoing challenge. Herein, raspberry-like mesoporous poly(styrene- co -divinylbenzene) (PSD) polymeric particles were fabricated by one-step dispersion polymerization in the solvent mixture of ethanol and toluene. The morphologies of obtained polymeric particles could be easily tuned from spherical to raspberry-like structure by changing the composition of the solvent mixtures. A rational mechanism for the formation of raspberry-like polymeric particles was also proposed according to the morphological evolution under different copolymerization conditions. With the assitance of the immonilized PVP layer, the raspberry-like PSD colloidal particles can be further functionalized by depositing Ag nanoparticles on the particle surface. The antibacterial activity of raspberry-like PSD/Ag composite particles against E. coli was up to 99.99%. In addition, raspberry-like PSD/Ag composites can be further utilized to construct antibacterial superhydrophobic surface and liquid marbles.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 2
·823-833
·
IF 5.693
Tang Zili,Xia Junsong,Yin Hang,Fu Guanghui,Ai Xitong,Tang Hailong,Yang Chaolong,Qu Lunjun,Li Youbing
Novel barium strontium titanate@silver (BST@Ag) hybrid particles with controllable Ag content are fabricated through the surface grafting modification combined with an in situ reduction of Ag + , using (3-mercaptopropyl)trimethoxysilane (MPTMS) as a surface-grafting agent. The surface character of BST nanoparticles changes from initially hydrophilic to lipophilic upon grafting of MPTMS. Polymer composites are then prepared by dispersing the BST@Ag hybrid particles in poly(aryl ether nitrile) (PAEN). Benefiting from improved compatibility and dispersibility between modified particle fillers and the polymer matrix, the BST@Ag/PAEN composites exhibit enhanced dielectric properties, including significantly increased dielectric permittivity, relatively low dielectric loss, and good permittivity-temperature stability below 140 °C. The composites also demonstrate excellent thermal stability and high mechanical strength, offering attractive prospects as high-temperature-resistant dielectric materials for use in various engineering applications. Graphical abstract
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OPTICAL MATERIALS
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2021
·
IF 3.08
Hui Zhao,Jihai Duan,Pengxia Sun,Zisheng Zhang,Weiwen Wang
Black Ti 3+ self-doping TiO 2 nanotubes (BTNT) have attracted widespread attention due to their abilities to enhance visible light response and photo-generated electron-hole separation without introducing impurity particles. However, due to the poor stability of Ti 3+ , the doping of a large amount of Ti 3+ is a huge challenge. In this work, we have taken a different approach, and the black Ti 3+ self-doping TNT-Ag-WO 3 (BAW) photocatalyst was prepared. The BAW Z-scheme photocatalytic (PC) system was successfully constructed. Compared with TNT's PC system (degrade 40.56%), BAW Z-scheme PC system can degrade 97.67% with 20 mg/L MB wastewater after 120 min. By introducing a large number of Ti 3+ and O vacancies, the inherent active group is mainly converted from the holes and.OH on the WO 3 valence band and.O 2 − on the TiO 2 conduction band , which improved the stability of O vacancies.Before and after the reaction, the reduction of Ti 3+ in BTNT is about 30 times that of Ti 3+ in BAW. This work provides a reference and basis for constructing Z-scheme heterojunction on BTNT, and also provides new ideas for improving the stability of Ti 3+ and O vacancies in self-doped TiO 2 .
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MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-12
·
IF 5.7
Liu Xinyu,Yu Yang,Xie Tianhua,Cao Zijin,Li Zhiyan,Li Yuejing,Gu Yingqiu,Han Caiqin,Yang Guohai,Qu Lulu
Monolayer g-C 3 N 4 -modified Au/Ag nanorods (g-C 3 N 4 /Au/Ag NRs) array is fabricated as a dual-function platform with high surface-enhanced Raman scattering (SERS) response and excellent photocatalytic degradation ability for bisphenol A (BPA) residues. FDTD simulation results of Au/Ag NRs proves that the electromagnetic field intensity is significantly enhanced at the gap of Ag NRs and Au NPs and the protrusion of Au NPs, which endows the arrays with excellent SERS activity. The arrays exhibit high sensitivity for rhodamine 6G (R6G) (LOD = 1.1 × 10 -11 mol/L) and high SERS enhancement (EF = 9.2 × 10 7 ). In addition, the g-C 3 N 4 /Au/Ag NRs could degrade ˃90% of BPA adsorbed on the substrate surface within 140 min under visible light irradiation, and maintains its SERS activity after repeated use for 4 times. The dual-function platform with high SERS response and excellent recycling capability is proved to be reliable and is very promising for monitoring of BPA residues in food. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Jiajia Ye,Xing Gao,Zifan Wang,Juan An,Ying Wang,Qingli Liu,Zhen Kong,Jiaxu Qi,Zhao Wang,Wensi Li,Jibin Song,Guang Xia
Lithium metal is an attractive and promising anode material due to its high energy density and low working potential. However, the uncontrolled growth of lithium dendrites during repeated plating and stripping processes hinders the practical application of lithium metal batteries, leading to low Coulombic efficiency, poor lifespan, and safety concerns. In this study, we synthesized highly lithiophilic and conductive Ag nanoparticles decorated on SiO 2 nanospheres to construct an optimized lithium host for promoting uniform Li deposition. The Ag nanoparticles not only act as lithiophilic sites but also provide high electrical conductivity to the Ag@SiO 2 @Ag anode. Additionally, the SiO 2 layer serves as a lithiophilic nucleation agent, ensuring homogeneous lithium deposition and suppressing the growth of lithium dendrites. Theoretical calculations further confirm that the combination of Ag nanoparticles and SiO 2 effectively enhances the adsorption ability of Ag@SiO 2 @Ag with Li + ions compared to pure Ag and SiO 2 materials. As a result, the Ag@SiO 2 @Ag coating, with its balanced lithiophilicity and conductivity, demonstrates excellent electrochemical performance, including high Coulombic efficiency, low polarization voltage, and long cycle life. In a full lithium metal cell with LiFePO 4 cathode, the Ag@SiO 2 @Ag anode exhibits a high capacity of 133.1 and 121.4 mAh/g after 200 cycles at rates of 0.5 and 1C, respectively. These results highlight the synergistic coupling of lithiophilicity and conductivity in the Ag@SiO 2 @Ag coating, providing valuable insights into the field of lithiophilic chemistry and its potential for achieving high-performance batteries in the next generation.
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BIOMACROMOLECULES
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2023
·
IF 6.2
Hanchen Wei,Caiyun Yang,Feihu Bi,Bang Li,Rui Xie,Deshui Yu,Shuzhen Fang,Zan Hua,Qingqing Wang,Guang Yang
Glycopolymer-supported silver nanoparticles (AgNPs) have demonstrated a promising alternative to antibiotics for the treatment of multidrug-resistant bacteria-infected diseases. In this contribution, we report a class of biohybrid glycopolymersome-supported AgNPs, which are capable of effectively killing multidrug-resistant bacteria and disrupting related biofilms. First of all, glycopolymersomes with controllable structures were massively fabricated through reversible addition–fragmentation chain transfer (RAFT) polymerization-induced self-assembly (PISA) in an aqueous solution driven by complementary hydrogen bonding interaction between the pyridine and amide groups of N-(2-methylpyridine)-acrylamide (MPA) monomers. Subsequently, Ag+ captured by glycopolymersomes through the coordination between pyridine-N and Ag+ was reduced into AgNPs stabilized by glycopolymersomes upon addition of the NaBH4 reducing agent, leading to the formation of the glycopolymersome@AgNPs biohybrid. As a result, they showed a wide-spectrum and enhanced removal of multidrug-resistant bacteria and biofilms compared to naked AgNPs due to the easier adhesion onto the bacterial surface and diffusion into biofilms through the specific protein–carbohydrate recognition. Moreover, the in vivo results revealed that the obtained biohybrid glycopolymersomes not only demonstrated an effective treatment for inhibiting the cariogenic bacteria but also were able to repair the demineralization of caries via accumulating Ca2+ through the recognition between carbohydrates and Ca2+. Furthermore, glycopolymersomes@AgNPs showed quite low in vitro hemolysis and cytotoxicity and almost negligible acute toxicity in vivo. Overall, this type of biohybrid glycopolymersome@AgNPs nanomaterial provides a new avenue for enhanced antibacterial and antibiofilm activities and the effective treatment of oral microbial-infected diseases.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Xuechang Ren,Suying Ding,Renhua Chen,Zhenyu Yang,Miao Tian,Ning Fu
Although CuFe 2 O 4 has been widely used in the field of Fenton-like wastewater treatment, its ability to activate H 2 O 2 still needs to be further improved. In this context, a novel Ag x /CFO OVs (x represents the theoretical mass percentage of Ag) composite catalyst was prepared by the tartaric acid reduction method for the first time, and its degradation performance and degradation mechanism of Phenol in a H 2 O 2 -based Fenton-like system were investigated. Through a series of characterizations, the successful preparation of the catalyst was confirmed. The degradation experiment showed that the degradation rate of 50 mg/L Phenol by Ag 2 /CFO OVs /H 2 O 2 system was 98.55% within 15 min, which was a significant improvement in the degradation efficiency compared with that of CuFe 2 O 4 and CFO OVs . X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) confirmed the successful introduction of oxygen vacancies (OVs). Electrochemical impedance spectroscopy (EIS) showed that Ag 2 /CFO OVs had the lowest impedance, and the synergistic effect of OVs and Ag effectively enhanced the degradation capability of the catalysts for Phenol. The capture experiments of active species and ESR tests showed that the main active species of the Ag 2 /CFO OVs /H 2 O 2 system were 1 O 2 and • OH. This study provides a new reference for the introduction of OVs and Ag in Fenton-like catalysts and their application to wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Hongxu Liu,Junhao Xie,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
Traditional water treatment membranes always face the problem of membrane contamination in the practical application. Those contaminants deposited on the membrane surface and inside the membrane pores make the filtration process more difficult. Herein, the temperature and photo sensitive nanocomposite membranes with superior wasterwater separation and light-cleaning capabilities were prepared by a non-solvent induced phase separation method, which combined the thermo-responsive property of poly(N-isopropylacrylamide) (PNIPAAm) grafted polyvinylidene fluoride (PVDF) and the high photothermal conversion character of core–shell structured BN@PDA-Ag nanosheets. The membranes can be heated to high temperature within a short period of light exposure due to the fast photothermal conversion capability of Ag and the excellent thermal conductivity of boron nitride (BN). The increase in temperature led to the contraction of PNIPAAm chains and bigger pore size. The microstructure, filtration, and cleaning performance of the nanocomposite membranes can be controlled by illumination, which allowed PVDF-g-PNIPAAm/BN@PDA-Ag membranes to achieve the effect of first interception and then cleaning. The membranes showed retention rates of 82, 99 and 95 % for BSA, oil–water emulsions and various dyes with flux recovery rates of > 90 % after light cleaning. This work provides a simpler, more efficient membrane cleaning strategy with superior potential for dealing with membrane contamination.
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Chemosensors
·
2023
·Vol. 11
·期 10
·531
·
IF 4.2
Mingzhu Wu,Jianhang Lin,Da Zheng,Yirui Yang,Zhihao Li,Zhengdong Zhu,Yonghui Shen,Gang Ni,Maofeng Zhang
Micro/nanoplastics are widespread in the environment and may cause severe damage to creatures and human beings. Micro/nanoplastic pollution has become a global focus issue; hence, the rapid and accurate detection of micro/nanoplastics is an essential step to ensure health. Herein, we report a surface-enhanced Raman scattering (SERS) technique to sensitively and quantitatively identify micro/nanoplastics in environmental water samples. A three-dimensional hierarchical Au@Ag nanostar (NSs) was synthesized and employed as an efficient SERS substrate. The “lightning rod effect” generated by tip branches of the nanostars and the coupling effect of the neighboring branches of the nanostar array enabled the ultra-trace detection of crystal violet (CV) down to 10−9M, even with a portable Raman device. Moreover, the hydrophobic property of the SERS substrate endowed it with a desirable enrichment effect, which meant an increase in the concentration or quantity of the micro/nanoplastic particles. And thereafter, the SERS sensor achieved a highly sensitive detection of polystyrene (PS) particle standard solution at a low concentration of 25 μg/mL or 2.5 μg/mL. Importantly, the detected concentration and the SERS intensity followed a nearly linear relationship, indicating the capability of quantitative analysis of micro/nanoplastics. In addition, the SERS sensor was successfully extended to detect PS particles in environmental water samples, including tap water, sea water, and soil water, and the detection concentration was determined to be 25 μg/mL, 2.5 μg/mL, and 25 μg/mL, respectively. The present Au@AgNSs array substrate with a two-order magnitude signal amplification further exhibited significant advantages in the label-free analysis of micro/nanoplastics in real water samples.Keywords:surface-enhanced Raman spectroscopy (SERS);Au@Ag nanostar;lightning rod effect;micro/nanoplastics;quantitative detection
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Biosensors-Basel
·
2023
·Vol. 13
·期 10
·927
·
IF 5.4
Jian Ju,Lin Li,Bei Li,Sagar Regmi,Tingting Wang,Jiao Xu,Chaojie Li,Shixing Tang
Serological-sensitive testing of cholesterol holds significant value in the fields of healthcare and clinical diagnosis. This study reports on the preparation of peroxidase-mimicking nanozymes through the wrapping of N, S-doped carbon dots (DCDs) on the surface of silver nanoparticles (Ag NPs@DCD). The shell–core structure of Ag NPs@DCD displays peroxidase-mimicking capability, with the potential to catalyze inactive Raman probe molecules into the Raman reporters. Furthermore, a “shell-isolated nanoparticles-enhanced Raman spectroscopy” structure exhibited an enhanced Raman signal of reporter molecules. Ag NPs@DCD were utilized to create a label-free SERS sensing system for high-performance detection of cholesterol in serum samples. These results demonstrate the potential of the novel nanozyme-based SERS approach for clinical diagnosis.Keywords:cholesterol;doped carbon dots;silver nanocomposite;peroxidase-mimicking;Surface-enhanced Raman Spectroscopy (SERS);label-free assay
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yonghui Yan,Yang Liu,Yongguang Zhang,Chunling Qin,Zhumabay Bakenov,Zhifeng Wang
Due to huge volume expansion and poor electrical conductivity, the commercial application of the promising Germanium (Ge) anode is restrained in lithium ion battery (LIB) field. Generally, conductive metals can improve the electron mobility in Ge. In that way, whether active materials or conductive metals account for a higher proportion in the anode is controversial in this field and needs to be clarified urgently. Herein, three Ge-based anodes with different ratios in conductive Ag are fabricated by a facile melt spinning and one-step dealloying method. It is found that Ag nanoparticles embedded three-dimensional nanoporous Ge (Ag/np-Ge) electrode with high active material ratio exhibits the best cycling stability among tested samples, delivering a high capacity of 953 mAh g −1 after 100 cycles at a current density of 100 mA g −1 and an excellent reversible capacity of 522 mAh g −1 after 200 cycles even at the high current density of 1000 mA g −1 . The enhanced cycling stability can be attributed to the synergistic effect of nanoporous network-like structure and embedded Ag nanoparticles. A dramatical increase in electrical conductivity and activity of Ge by doping of Ag is confirmed by density functional theory (DFT) calculations. The work provides us an idea to rationally design the three-dimensional structure of active materials assisting with a proper ratio of conductive metals, which may promote the development of promising Ge anodes for LIBs with excellent cycling stability.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Ziwei Hu,Xia Zhou,Jun Duan,Xueqiang Wu,Jiamin Wu,Pengcheng Zhang,Wanzhen Liang,Jialiang Guo,Huaihong Cai,Pinghua Sun,Haibo Zhou,Zhengjin Jiang
The design of a rapid, simple, and ultrasensitive detection platform of protein biomarkers has become an urgent need in early diagnosis and treatment. Surface-enhanced Raman scattering (SERS) technology, with the unique advantages of ultra-sensitivity and fingerprint recognition, has attracted much attention in biomarker detection. An innovative aptamer SERS biosensor for highly sensitive protein biomarker detection was presented. This biosensor contains a SERS tag (reporter-labeled Au nano-bridged nanogaps particles, Au NNPs) and novel magnetic capture substrate (Ag-coated Fe 3 O 4 -Au NPs, Ag MNPs). C-reactive protein (CRP), a representative biomarker for diagnosing, was used to assess the SERS performance of this biosensor. Aptamers against CRP were modified on both SERS tag and magnetic capture substrate for specific recognition by Au NNPs-CRP-Ag MNPs sandwich assay. This strategy achieved sensitive detection of CRP with a limit of detection (LOD) of 10 fM (1.14 pg/mL), and is much lower than reported analytical methods. Besides, this method exhibits excellent selectivity and specificity for CRP under the interference of other proteins and displays high accuracy in the detection of actual human serum samples. This proposed detection strategy can be extended to the sensitive detection of other biomarker proteins and hold great promise in the clinical diagnosis of diseases.
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危险品化学品经营许可证（带存储）