Frontiers in Energy Research
·
2021
·
IF 4.008
Liu Yang,Zhang Yuchen,Xie Tao,Yue Ming,Wang Dongsen,Li Bin
In light of the difficulty of solid-liquid separation of waste PEM drilling fluid in the Bohai oilfield, constructing an inorganic-organic flocculation system is proposed and the processing method of destabilization technology is optimized. The biggest influence factor on the flocculation process of PEM drilling fluid was determined by designing an orthogonal test. The flocculation mechanism was researched through single factor optimization, combined with zeta potential and particle size distribution test. The results showed that the most significant factors affecting the flocculation of waste PEM drilling fluid were the dosage of inorganic flocculant CaCl2 and flocculation pH value. When the dosage of inorganic flocculant CaCl2 was 1.2% (w/v), the dosage of organic flocculant SDYJ-2 was 0.05%, the flocculation pH value was 3, and the flocculation time was 5 min, the flocculation technology reached the optimization and then the liquid yield can reach 70.96%. The mechanism of flocculation and destabilization was as follows: the inorganic flocculant of CaCl2 mainly reduced the zeta potential of clay particles through electric neutralization. 1% CaCl2 could reduce the potential mean value of drilling fluid system from -38.1 mV to -32.5 mV, and then decrease the repulsion among suspensions. Through bridging curling and electric neutralization, the organic flocculant of SDYJ-2 can absorb and wrap the clay particles after flocculation destabilization to form a network spatial structure, which made clay particles aggregate into large flocs and particles. D50 can increase by 21.5 times, when the concentration of SDYJ-2 was 0.15%.
研究领域:
石油工程
·
环境科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yuqi Yang,Shengjun Bu,Xiaoying Zhang,Qiqing Duan,Heyuan Meng,Zhuo Hao,Xiuxia He,Jiayu Wan
Infectious diseases caused by the influenza virus are the primary global concern. This study aimed to develop an electrochemical biosensor for detecting influenza A H1N1 virus based on duplex-specific nuclease (DSN) and rolling circle amplification (RCA) technologies. A single-stranded DNA (ssDNA) probe, comprising a recognition sequence for a target sequence of influenza virus H1N1-specific RNA sequence and primer sequence for initiating RCA, was designed and synthesized. A specific sequence of target H1N1 RNA triggered cyclical DSN cleavage of the probe. The released primer sequence then initiated RCA to generate detectable ssDNA-labeled multiple biotins. ssDNA was captured by streptavidin (SA) on the electrode surface and labeled with free Streptavidin-Horseradish Peroxidase (SA-HRP). The H1N1 influenza virus was quantitatively analyzed based on the changing current signal generated on the electrode surface. A linear range from 10 pM to 100 nM and a limit of detection of 0.44 pM were recorded. In addition, the biosensor demonstrated excellent selectivity, repeatability, and stability for analyzing H1N1 in real samples. This biosensor could be applied for the clinical diagnosis of influenza A H1N1 virus.
研究领域:
医学诊断
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分子生物学
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生物传感技术
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2017
·
IF 2.499
Mohammad Russel,Sun Zhenxiang,Liu Changrui,Zhou Hao,Liu Lifen,Sophocleous Marios,Zhou Yong
A microwave-based, rapid and non-destructive spectroscopic technique has been developed to monitor contamination in beach-sand. A set of in-vitro experiments were designed to test beach-sand samples contaminated with meta-cresol (m-cresol) and water with weight/weight percentages of 0–20%, using a prototype probe with a long sample holder (16 mm). The frequency range used was 10 MHz–1 GHz during the whole experiment. Air and Teflon were investigated as low-loss materials, whilst ethanol was used as a typical, frequency-dependent, polar material to further verify the technique. The real part of the relative complex permittivity was found to be very close to the theoretical and fitting very well with the Debye model. This dielectric technique showed a linear relationship between the real part of relative complex permittivity and m-cresol/water content, for a frequency range of 0.02–0.7 GHz for water and 0.02–0.2 GHz for m-cresol. The sensitivity was calculated to be 0.58% −1 and 0.12% −1 for water and m-cresol, respectively.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
Foods
·
2022
·Vol. 11
·期 12
·1698
·
IF 5.561
Pan Gao,Yunpeng Ding,Zhe Chen,Zhangtao Zhou,Wu Zhong,Chuanrong Hu,Dongping He,Xingguo Wang
This study was the first time the effects of pretreatment technology (microwave roasting, MR; oven roasting, OR; steaming roasting, SR) and processing technology (screw pressing, SP; aqueous enzymatic extraction, AEE; subcritical butane extraction, SBE) on the quality (physicochemical properties, phytochemical content, and antioxidant ability) of walnut oil were systematically compared. The results showed that the roasting pretreatment would reduce the lipid yield of walnut oil and SBE (59.53–61.19%) was the processing method with the highest yield. SR-AEE oil provided higher acid value (2.49 mg/g) and peroxide value (4.16 mmol/kg), while MR-SP oil had the highest content of polyunsaturated fatty acid (73.69%), total tocopherol (419.85 mg/kg) and total phenolic compounds (TPC, 13.12 mg/kg). The DPPH-polar and ABTS free radicals’ scavenging abilities were accorded with SBE > AEE > SP. SBE is the recommended process for improving the extraction yield and antioxidant ability of walnut oil. Hierarchical cluster analysis showed that processing technology had a greater impact on walnut oil than pretreatment technology. In addition, multiple linear regression revealed C18:0, δ-tocopherol and TPC had positive effects on the antioxidant ability of walnut oil, while C18:1n-9, C18:3n-3 and γ-tocopherol were negatively correlated with antioxidant activity. Thus, this a promising implication for walnut oil production.Keywords:walnut oil;pretreatment;processing;subcritical butane extraction;steaming roasting
研究领域:
食品科学
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植物化学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yu Liang,Mingsheng Ma,Faqiang Zhang,Feng Liu,Tan Lu,Zhifu Liu,Yongxiang Li
In the present work, a wireless microfluidic sensor based on low-temperature cofired ceramic (LTCC) technology for real-time detection of metal ions in water is proposed. The wireless sensor is composed of a planar spiral inductor and parallel plate capacitor (LC) resonant antenna, which integrates with the microchannel in the LTCC substrate between the capacitor plates. Aqueous solutions of Pb(NO3)2, Cd(NO3)2, Mg(NO3)2, Ca(NO3)2, NaNO3, and KNO3 with concentrations of 0–100 mM were tested with the sensors. The metal ion and its concentration in water can be tested by the amplitude of the reflection coefficient (S11) and the resonance frequency (fr) of the wireless microfluidic sensor. The metal ion species can be distinguished from the wireless response behavior of the sensor. The detection limit of the sensor for the selected metal ionic solutions could reach as low as 5 μM. The normalized sensitivity of the sensor is 0.47%, which is higher than that of the reported liquid microfluidic sensors based on microwave resonators. The wireless microfluidic sensor of this study is promising for rapid and convenient detection of heavy metal ion pollutants in the industrial wastewater.
研究领域:
环境科学
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材料科学
·
分析化学
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DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Shuo Yang,Fuming Yang,Wenhao Dou,Yuan Chi,Yujie Chi
To develop rapid detection techniques for liquid eggs' adulteration, three types of adulterations were considered: water dilution, manipulation of yolk ratio in whole egg, and blending different varieties of egg white or yolk. Objective: Establish detection techniques utilizing colorimetry , electrochemistry, and interfacial fingerprinting for these adulterations, respectively. Results: Colorimetry allows for detection (1 min·sample -1 ) of water dilution through linear (R 2 ≥ 0.984) and exponential fitting (R 2 ≥ 0.992); Electrochemistry enables detection (6 min·sample -1 , R 2 ≥ 0.979) of the adulteration of yolk ratio in whole egg; Interfacial fingerprinting technique effectively detects (detection duration: 10 min·sample -1 , detection limit: 1.0–10.0 wt%) the adulteration of different varieties of egg white. Subsequently, through 3D-fluorescence microscopy (interface height variation: 22.49–573.45 μm), interfacial tension variation (65.54–35.48 mN·m -1 ), contact angle variation (89.7°–32.9°), particle size range (free water: 0.94–14.29 μm; protein aggregation: 6.57–10.76 μm), and etc., interfacial fingerprinting mechanism was elucidated. This research contributes novel insights into the detection of adulteration in liquid eggs.
研究领域:
食品科学
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分析化学
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生物物理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Dongyu Hou,Jian Chen,Fengning Bai,Fanming Meng,Peng Dong,Chengxu Zhang,Yingjie Zhang,Jue Hu
Recently, the increase in lithium-ion batteries has led to a significant rise in battery scrapping, raising concerns of environmental pollution and resource waste. Therefore, regenerating these discarded lithium-ion batteries has become urgent. In this work, we propose a cost-effective and efficient LiFePO 4 cathode material regeneration technology with nitrogen-doping capabilities. Through plasma discharge, high-energy particles interact with the material's surface, initiating reactions that promote nitrogen-doping. Additionally, the reduction of Fe 3+ impurities to Fe 2+ enhances Li + embedding, thereby inhibiting Fe/Li inversion and achieving structural repair in the process. The regenerated LiFePO 4 , used as the cathode material, exhibits high capacity and cycle performance. It achieves a discharge capacity of 160.2 mA h g −1 at 0.1C and maintains about 146 mA h g −1 at 1C over 200 cycles without significant degradation. Furthermore, the regeneration time is nearly five times shorter than traditional methods. This method's low cost and short processing time provide crucial support for the recycling of waste cathode materials.
研究领域:
材料科学
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环境科学
·
能源技术
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DOI
高影响因子
Advanced Fiber Materials
·
2021
·Vol. 3
·期 4
·239-250
·
IF 0
Xue Lili,Fan Wei,Yu Yang,Dong Kai,Liu Chengkun,Sun Yanli,Zhang Cong,Chen Weichun,Lei Ruixin,Rong Kai,Wang Qi
Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and comfortableness. However, yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable devices. This work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding technology. The fineness of single yarns as well as strength are both improved significantly compared to previous works. The piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz, and the cycle stability can maintain more than 3200 cycles. Furthermore, the piezoelectric yarns are further woven into piezoelectric plain fabric. According to the electrical performance, the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical performance. The yarn of the 10 cm in length and 600 μm in fineness can produce an output voltage of 120 mV. Meanwhile, Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement, such as bending, walking. Therefore, the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly, and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements, which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics. Graphical Abstract
研究领域:
材料科学
·
纺织工程
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能源技术
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产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhuoyuan Yang,Kehao Tang,Wenjun Song,Zefu Ren,Yuxuan Wu,Daewon Kim,Sirish Namilae,Yifei Yuan,Meng Cheng,Yizhou Jiang
Supercapacitors produced based on 3D printing technology greatly expand the range of materials and geometric complexity. However, the production of fiber-based supercapacitors typically requires subsequent steps. For the first time, we report a coaxial direct writing technique that enables the one-step fabrication of braided flexible solid-state supercapacitors. Continuous carbon fiber is used as a flexible substrate. α-manganese dioxide nanowires and activated carbon are used as active materials. The entire electrode assembly is coated with solid-state electrolyte and then braided. Through coaxial direct writing technology, the braided electrodes and sealings can be extruded by a coaxial nozzle to continuously print free-form ultra-strong supercapacitors with a tensile strength of the braided electrodes up to 636 MPa. Electrochemical measurement results show that the printed capacitor exhibits an excellent specific capacitance, and it still maintains a capacitance retention of 90.1% after 1000 cycles. The supercapacitor exhibits nearly identical electrochemical capacitive characteristics at various bent angles. This work paves the way for integrating enhanced durability and adaptability into next-generation wearable and portable electronic systems.
研究领域:
材料科学
·
能源存储
·
先进制造
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产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Shikai Zhao,Zhiyi Zhu,Jian Yu,Chenmin Yao,Miaoyang Yu,Hongye Yang,Cui Huang
Objective: This paper aimed to assess the impact of the acetone wet-bonding (AWB) technique on dentin bonding and to investigate its potential underlying mechanisms. Materials and Methods: Caries-free third molars were sliced, ground, etched, water-rinsed. Then the specimens were randomly allocated to four groups according to the following pretreatments: 1. water wet-bonding (WWB); 2. ethanol wet-bonding (EWB); 3. 50% (v/v) acetone aqueous solution (50%AWB); 4. 100% acetone solution (AWB). Singlebond universal adhesive was then applied and composite buildups were constructed. The microtensile bond strength (MTBS), failure modes and interface nanoleakage were respectively evaluated after 24 h of water storage, 10,000 times of thermocycling or 1-month collagenase ageing. In situ zymography and contact angle were also investigated. Results: Acetone pretreatment preserved MTBS after thermocycling or collagenase ageing ( p < 0.05) without affecting the immediate MTBS ( p > 0.05). Furthermore, AWB group manifested fewer nanoleakage than WWB group. More importantly, the contact angle of the dentin surfaces decreased significantly and collagenolytic activities within the hybrid layer were suppressed in AWB group. Conclusion: This study suggested that the AWB technique was effective in enhancing the dentin bond durability by increasing the wettability of dentin surface to dental adhesives, removing residual water in the hybrid layer, improving the penetration of adhesive monomer, and inhibiting the collagenolytic activities. Clinical significance: The lifespan of adhesive restorations would be increased by utilization of acetone wet-bonding technique.
研究领域:
牙科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
·
2025
·
IF 5.9
Yichi Zhang,Junsheng Wang,Yuezhu Wang,Yinchun Li,Qiaoyu Feng,Qing Yu
Conventional electrochemical methods, improved for selectivity and sensitivity through the application of ion-selective membranes or electrode modifications, were complex to produce and prone to interference from other ions, lacking effective mitigation strategies. Therefore, a simple, accurate, and selective detection method for nickel ions based on a microfluidic electrochemical sensor was developed. The microfluidic electrochemical sensor incorporated a bare carbon electrode. The microfluidic technology was employed to control the sequential mixing of samples, masking agents, and chelating agents, achieving automated sample preprocessing within 1 min, faster than the conventional electrode modification process. The hybrid microchannel was designed to enhance the effectiveness of mixing between the sample and the masking agent, resulting in increasing the masking effect on interfering ions. Based on the high affinity of the masking agent for interfering ions, the interference ions were effectively masked, ensuring that only nickel ions reacted with the complexing agent. Tests using pure nickel solutions revealed that the microfluidic electrochemical sensor possessed excellent properties of linear detection range and resolution. Compared to conventional modified electrodes, the microfluidic electrochemical sensor simplified fabrication, exhibited good reproducibility and repeatability, and achieved higher selectivity. The experiments on anti-interference performance demonstrated that the masking agent effectively shielded against interfering ions, the Bias% after the mask was less than 3%. The practical tests using real water samples proved the effectiveness and suitability of this detection method in specifically identifying heavy metal ions.
研究领域:
电化学传感
·
微流控技术
·
分析化学
·
环境监测
·
重金属检测
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Qi Zhao,Hui Ma,Christian M. Pedersen,Mengyu Dou,Yan Qiao,Xianglin Hou,Yongqin Qi,Yingxiong Wang
Pure shift, a novel nuclear magnetic resonance (NMR) spectroscopy technique is here applied to analyze the hydrogenation/hydrogenolysis products of the biomass-derived platform compounds. The complex and very overlapped 1H NMR signals of the model mixtures from several biomass hydrogenation/hydrogenolysis reactions, such as glucose hydrogenation, sorbitol hydrogenolysis, levulinic acid (LA) formation, tetrahydrofurfuryl alcohol hydrogenolysis, and a real reaction system, were successfully analyzed and assigned by suppressing homonuclear couplings. Thus, we can clearly achieve component analysis and distinguish most signals according to one-dimensional (1D) pure shift obtained by chirp excitation (PSYCHE) spectra. For sophisticated mixtures, e.g., α-d-glucose, sorbitol, and mannitol, or LA, γ-valerolactone, and 2-methyltetrahydrofuran, and finally the real reaction mixture, the 1D total correlation spectroscopy (TOCSY)-PSYCHE approach was used as a supplementary tool to obtain full signals in one component. This allowed us to further resolve the signals where the PSYCHE technique failed to distinguish the signals sufficiently. The results demonstrated that the combined use of 1D PSYCHE and 1D TOCSY-PSYCHE techniques successfully analyzed various catalytic hydrogenation/hydrogenolysis mixtures and enabled us to provide precise signal assignments. Therefore, the pure shift NMR tool (a combination of 1D PSYCHE and 1D TOCSY-PSYCHE) can significantly simplify and successfully be used to assign the NMR spectra of the biomass-derived complex mixture, such as hydrogenation/hydrogenolysis reaction mixtures.
研究领域:
化学
·
分析化学
·
生物化学
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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）