SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yilin Lu,Jie Zhong,Guohua Yao,Qing Huang
A prototype of label-free SERS sensor, based on the formation of T-Hg 2+ -T pairs and the corresponding orientation variation of DNA on Au shell surface, was developed for detection of Hg 2+ in aqueous solution quantitatively and selectively. The DNA aptamer immobilized on the surface of SiO 2 @Au core/shell nanoparticles (NPs) consisted of two segments, namely, the segment which has the consecutive thymines (T) severing as the Hg 2+ recognition elements, and the segment which contains the guanine (G) and adenine (A) bases working as the signal reporter. With interaction of Hg 2+ ions and the thymines between the adjacent single-stranded DNA (ssDNA), the DNA molecule adopted vertical orientation, resulting in increase of Raman intensity ratio I(660 cm −1 )/I(736 cm −1 ) with increase of Hg 2+ concentration, which thus allowed to measure trace amounts of Hg 2+ in aqueous solution selectively and quantitatively. Our results revealed that this label-free SERS sensor could sensitively respond to Hg 2+ ions within a wide concentration range (from 1 × 10 −8 to 1 × 10 −3 M). This work therefore demonstrates that proper design of aptamer-modified SiO 2 @Au core/shell NPs can be utilized for label-free SERS detection of heavy metal ions in the environment.
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高影响因子
Results in Engineering
·
2024
·
IF 6
Ziteng Feng,Tong Wang,Yakai Lin,Lin Wang,Yuanhui Tang,Huanhuan Wu,Hedi Chen,Lixin Yu,Xiaolin Wang
Polyvinylidene fluoride (PVDF) membranes, widely used for their stability, face limitations due to the hardly adjustable pore size in nanoscale and inherent hydrophobicity. To address this, we proposed a co-deposition method incorporating dopamine (DA), polyethyleneimine (PEI), and silicon dioxide (SiO 2 ) nanoparticles with glutaraldehyde cross-linking for precise regulation of pore size and hydrophilicity in PVDF hollow fiber membranes. Notably, the pore diameter reduced from 119.0 ± 3.55 nm to 18.4 ± 0.36 nm, while the contact angle decreased from 107.7° to 40.9°. This simultaneous regulation led to a high-performance PDA/PEI/SiO 2 -PVDF hydrophilic ultrafiltration membrane with a rejection rate exceeding 99% for 20 nm nanoparticles in a long-term simulated separation experiment while achieving a significant protein permeability of 97% in BSA permeation experiments. Additionally, the membrane demonstrated exceptional long-term stability, offering a novel approach for tuning the performance of ultrafiltration/microfiltration membranes.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jingcheng Zheng,Jie Chen,Ruifen Sun,Weiwei Zhang,Yun Huang,Jiwei Shao,Yuwu Chi
Fluorescent immunochromatographic test (FICT) strips have received extensive attention due to their virtue of simple operation, low cost, and a point-of-care (POC) assay. In recent years, people are constantly seeking new labels to improve the sensitivity of immunosensors. Perovskite nanocrystals (PNCs) possess strong fluorescence and a narrow emission peak, making them an excellent choice as a new fluorescent signal label. Herein, we have developed a simple, fast, and environmentally friendly method to synthesize CsPbBr 3 /CsPb 2 Br 5 @SiO 2 with the good water stability and high biocompatibility. These CsPbBr 3 /CsPb 2 Br 5 @SiO 2 have been applied to construct FICT strips. To achieve the quantitative determination of human chorionic gonadotropin (HCG), a lab-made FICT strips detection system was established. The FICT strips had a good linear relationship to HCG in the range of 5–500 ng/mL, and the detection limit was 2.09 ng/mL. In addition, the recovery results of HCG detection in human urine samples also proved the feasibility of this FICT strips. CsPbBr 3 /CsPb 2 Br 5 @SiO 2 can also be modified with different biomarkers for functionalization, which exhibits a promising application in the development of sensing platform of FICT strips.
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PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Zhihao Zhao,Hao Jiang,Meng Cheng,Shuai Wang,Shuangqing Sun,Chunling Li,Songqing Hu
Although aluminum alloys are widely used in various industries, their wear and corrosion resistance are still needed to be enhanced. In this study, a robust anti-corrosion composite coating was prepared on the surface of Al alloy based on multiple reinforcement strategies. The composite coating is consisted of horizontally arranged and functionally modified h-BN nanosheets doped SiO 2 coating (SiO 2 -hBN(NH 3 + ) coating) and corrosion inhibitor MBT loaded porous anodic alumina (PAA-MBT) film. Results show that the composite coating prepared in this work has excellent corrosion resistance due to the effect of the extended penetration path of corrosive medium by h-BN(NH 3 + ) nanosheets, the full-thickness hydrophobicity of the SiO 2 coating, the corrosion inhibition of the MBT released from the PAA film and the physical barrier of the entire coating system. In addition, the composite coating also exhibits good mechanical properties including high hardness, high bonding strength and superior wear resistance. This work provides a novel design of protective coating with excellent anti-corrosion resistance and mechanical properties, which has a promising prospect in the development of superior long-term anti-corrosion coatings for aluminum alloy.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 45
·e56215
·
IF 2.7
Xinxin Xu,Shangchao Ji,Lei Shi,Hailong Chen,Dong Liu,Jiawen Dai,Xianze Yin,Baoqing Shentu,Long Zheng
Developing nonchemical cross-linked natural rubber (NR) latex gloves with antibacterial properties and simultaneously enhanced mechanical strength and elongation at break is challenging. In this study, liquid-like silica (SiO 2 ) nanofluids (SiO 2 nfs) with hard SiO 2 cores and soft organic molecule shells are synthesized and then self-assembled with graphene oxide (GO) via electrostatic interactions to create GO@SiO 2 nfs hybrids, which are blended with NR latex. Strong hydrogen bonding and electrostatic interactions between NR latex particles and GO@SiO 2 nfs hybrids form physically cross-linked GO@SiO 2 nfs/NR composite films. The rigid GO in the hybrids provided reinforcement, while the vicious SiO 2 nfs facilitated the energy dissipation during stretching. This synergy results in simultaneous improvements in the mechanical strength and elongation at break of the GO@SiO 2 nfs/NR composite films. Their tensile strength increased by 95.2% compared with pure NR films and by 20.6% compared with GO/NR composite films, and the elongation at break improved by 27.8% and 19.4%, respectively. Furthermore, the presence of quaternary ammonium cation in SiO 2 nfs conferred excellent antibacterial efficacy against Escherichia coli and Staphylococcus aureus to the GO@SiO 2 nfs/NR composite films. These results offer valuable insights for the development of high-performance, nonchemical cross-linked NR latex products.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Qiangqiang Zhu,Chun Shen,Jie Wang,Tianwei Tan
The upgrade of acetone–butanol–ethanol (ABE) mixture from biomass to high-value biofuels has aroused increasing attention. However, a reported heterogeneous catalyst, metal-containing MgAl-hydrotalcite (HT), is confronted with a serious water-resistance problem due to an inherent memory effect of HT materials. With the aim of exploring catalysts with improved water-resistance, metal-containing MgO–SiO2 catalysts were synthesized and evaluated. An investigation on the effect of metal type including Ni, Cu, Fe, Zn, and Co, metal loading, and reaction temperature on catalytic performance indicates that the 10 wt % Ni–MgO–SiO2 catalyst provides the best catalytic performance, giving a yield of 81.5% to C5–C15 ketones and alcohols at 240 °C. As expected, the catalyst exhibits an excellent water-resistance. It could tolerate up to 3 wt % water, which was much higher than 0.5 wt % over that of Cu- or Pd-HT as reported. Results from XRD and 29Si MAS NMR analyses indicate that the high water-resistance could be ascribed to the more stable structure of magnesium silicates formed in the catalyst than HT materials. For a further study of the effect of catalyst property on catalytic performance, 10 wt % Ni–SiO2, 10 wt % Ni–MgO, and 10 wt % Ni–MgO–SiO2 catalysts were investigated and characterized. Results from CO2-TPD, pyridine-IR, and NH3-TPD analyses reveal that the catalytic performance is significantly affected by an acid–base property. Obtaining a high catalytic performance necessitates a cooperation of enough acidic sites and basic sites.
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Molecular Catalysis
·
2024
·
IF 3.9
Yuqiu Wu,Fanjin Meng,Jiaolong Fu,Yuyang Zhou,Huan Fan,Xin Ju,Liangzhi Li
D-xylose, a biomass derivative, is used as a substrate to generate D-xylulose and D-ribulose with high-added value through a cascade reaction. During this process, the thermal stability and catalytic efficiency of rate-limiting enzymes during cascade reactions are important issues that must be addressed in industrial applications. In this study, we prepared and validated PDA/SiO 2 microspheres as highly loaded immobilization carriers by oxidative self-polymerization of polydopamine (PDA) on silica (SiO 2 ) microspheres. D-xylose was successfully catalyzed by the co-immobilized D-5-phosphate ribose isomerase B (RpiB) and D-tagatose-3-epimerase (DTE), denoted PDA/SiO 2 -RpiB-DTE, to produce D-ribulose and D-xylulose. After immobilization, the K m of co-immobilized RpiB and DTE decreased, which suggested increased substrate affinity. The half-life of the co-immobilized enzymes was 3.5–8 fold higher than that of the free enzymes at 50–70 °C, and the inactivation rate constant was reduced, demonstrating that immobilization improved significantly the thermal stability. The conversion of D-xylose at 10 mM was 29.98% under optimal conditions, which contained 9.85% D-ribulose and 20.13% D-xylulose. PDA/SiO 2 -RpiB-DTE showed up to 89.10% initial enzyme activity after 3 recycle runs. The thermal stability and recovery aspects were improved by immobilization, which facilitates the use of biomass to produce high-value-added products and further exploitation.
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Foods
·
2025
·Vol. 14
·期 14
·2421
·
IF 5.1
Mengqiong Yang,Guangming Mei,Daoxiang Huang,Xiaojun Zhang,Pengfei He,Si Chen
A sensitive method was developed for detecting diazepam residues in aquatic products using magnetic dispersive solid-phase extraction (MDSPE) coupled with ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS). Samples extracted with 1% ammonia–acetonitrile were purified using synthesized Fe3O4@SiO2-PSA nanoparticles via MDSPE before UPLC-MS/MS analysis. Separation was performed on a C18column with gradient elution using 0.1% formic acid–2 mM ammonium acetate/methanol. Detection employed positive electrospray ionization (ESI+) in multiple reaction monitoring (MRM) mode. Characterization confirmed Fe3O4@SiO2-PSA’s mesoporous structure with excellent adsorption capacity and magnetic properties. The method showed good linearity (0.1–10 μg/L,r> 0.99) with an LOD and LOQ of 0.20 μg/kg and 0.50 μg/kg, respectively. Recoveries at 0.5–15.0 µg/kg spiking levels were 74.9–109% (RSDs 1.24–11.6%). This approach provides rapid, accurate, and high-precision analysis of diazepam in aquatic products, meeting regulatory requirements.
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PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zhenxin Yang,Fushun Li,Yuanju Zhao,Delong Yang,Juntao Hu,Tao Zhang,Deng-Ke Wang,Qiang Zhu,Zheng-Hong Lu
Organic field-effect transistors (OFETs) fabricated on SiO2/Si wafers represent a crucial avenue for the development of organic-on-silicon technology and serve as a platform for materials science to characterize carrier mobility. The surface cleaning treatment of wafers is critical because OFETs are highly sensitive to surface states. In this study, the effects of intrinsic organic contaminants on wafers, as well as the functions of commonly used cleaning solvents and treatments on the surface states, electronic structure of SiO2, and the performance of OFETs were systematically investigated. The intrinsic organic contaminants on the wafer surface were identified as being in positively charged states, which led to high operational voltages of OFETs and degraded bias-stress stability. However, their impact on field-effect mobility was found to be minimal following any surface cleaning process. The conventional ultrasonic cleaning using acetone and isopropanol only partially removed contaminants, which provides limited improvement in reducing operational voltages and enhancing bias-stress stability. The subsequent ultrasonic cleaning with deionized water and UV-ozone treatment further removed contaminants. More importantly, these processes anchor hydroxyl species on the SiO2 surface, which impart negative charges for the neutralization of surface charge states, thereby comprehensively enhancing operational performance of devices. By leveraging the distinct properties of various solvents and treatments, an optimized surface cleaning protocol was proposed, in which the threshold voltage of OFETs was reduced to nearly 0 V, and the bias-stress stability was enhanced by approximately 300%.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yazhuang Ji,Guomin Yu,Xueying Ma,Hongfang Wang,Yinghua Li,Hui Li,Fang He,Tiebing Cui
Conventional polypropylene (PP) separators in lithium-ion batteries (LIBs) suffer from poor thermal dimensional integrity and limited flame retardancy, posing significant safety hazards. In this work, a novel phosphorus-nitrogen-based flame retardant, pentaerythritol diphosphate-1-piperazine ethanol phosphate (PDPE), was synthesized. Its molecular structure features phosphate ester groups and nitrogen-containing piperazine rings, which endow PDPE with a dual flame-retardant function: gas-phase radical quenching and condensed-phase char promotion. PDPE was then integrated with inorganic oxides (SiO 2 or Al 2 O 3 ) to fabricate organic–inorganic hybrid composite separators via a simple and scalable coating method. Meanwhile, the inorganic oxides provide thermal insulation and enhance ionic conductivity, collectively contributing to improved thermal stability and the electrochemical performance of lithium-ion batteries. Among the composites, the PA63 separator (PDPE/Al 2 O 3 ) showed outstanding fire resistance, with a 53 % reduction in peak heat release rate (PHRR) and a 36 % decrease in total heat release (THR), while the char residue increased from 4.38 % (PP) to 25.38 %. It also remained dimensionally stable at 200 ℃ and exhibited a markedly reduced self-extinguishing time. Electrochemical tests showed a discharge capacity of 169.3 mAh/g after 100 cycles at 0.5C and 145.4 mAh/g at 2C, significantly higher than the commercial PP separator (147.7 mAh/g at 0.5C and 91.5 mAh/g at 2C). These results demonstrate the potential of PDPE-based composite separators for next-generation LIBs with superior safety and electrochemical performance.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Luxuan Zhang,Bo Xu,Man Zhou,Ying Liu,Ying Zhang,Li Cui,Ping Wang,Qiang Wang,Yuanyuan Yu
The development of multifunctional textiles for personal thermal management is critical to address growing concerns about global warming and heat stress. Textiles integrating unidirectional water transport and radiative cooling capabilities through simple, low-cost fabrication represent a promising approach for personal moisture and heat regulation. In this work, a dual-mechanism cooling textile (RC@Cotton) featuring an electrostatic network coating is developed, combining radiative and evaporative cooling functionalities. RC@Cotton exhibited enhanced evaporative cooling efficiency and directional moisture transport via the in-situ growth of SiO 2 particles, coupled with a Janus structure created using an asymmetric spraying strategy. This textile exhibited moderate solar reflectance (77.65 %) and high mid-infrared emissivity (97 %). This mitigated the light pollution issues associated with conventional, highly reflective radiative cooling materials while maintaining effective cooling. Janus RC@Cotton achieved a cooling effect of up to 8 °C under direct sunlight and could even cool below ambient temperature (5 °C) under perspiration conditions. Incorporating PEI/PA greatly improved the durability of the coating and gave Janus RC@Cotton outstanding antibacterial properties (99.9 %). Theoretical calculations and EnergyPlus simulations confirmed the substantial energy-saving potential of this technology for personal and building applications. This study presents a new approach to designing multifunctional cooling textiles that promote sustainable thermal comfort and energy efficiency.
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COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Jinghua Wang,Zhishen Yin,Jie Sun,Yeqing Liu,Ruoxi Fan,Jialiang Li,Duo Chen,Jia Yan,Shichao Li,Zhanjun Wu
The mechanical properties of resin matrixes are predominant factors influencing the overall performance of fiber-reinforced composites. In this study, the high brittleness and low toughness of epoxy resin (EP) are addressed by incorporating hydroxyl-terminated polyether-sulfone (PES-OH) and nano-silica (Nano-SiO 2 ) into the EP. The incorporation of PES-OH into EP led to a 22.6 % increase in tensile strength and a 27.8 % improvement in elongation at break at ultra-low temperatures. These enhancements are attributed to the formation of a semi-interpenetrating polymer network (SIPN) during the curing process, which strengthens the molecular network of the epoxy resin matrix through physical entanglement, interfacial reinforcement, and stress dispersion, enhancing crack resistance. The simultaneous introduction of PES-OH and Nano-SiO 2 synergistically improves the mechanical properties of EP at ultra-low temperatures (90 K). Specifically, the tensile strength, elongation at break, and modulus of elasticity of the modified EP were increased by 30.63 %, 19.6 %, 20.9 % and a 65.61 % improvement in fracture toughness (K IC ), respectively, compared to the pure EP. The synergistic effect arises from the covalent bonding between the hydroxyl groups on Nano-SiO 2 and those in PES-OH and EP, thereby toughening and strengthening the epoxy molecular structure. Additionally, microdroplet debonding tests of carbon fiber with EP showed a 25.22 % increase in interfacial shear strength after introducing PES-OH and Nano-SiO 2 . Dynamic thermo-mechanical analysis confirmed that the incorporation of PES-OH and Nano-SiO 2 does not compromise the thermal stability of EP.
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危险品化学品经营许可证（带存储）