JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
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2019
·Vol. 56
·期 2
·1027-1036
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IF 1.85
Yang Shuang,Liu Jingsheng,Zheng Mingzhu,Zhao Chengbin,Cao Yong,Dong Yanjiao,Yaqoob Sanabil,Xiao Yu,Xu Xiuying
Cordyceps militaris ( C. militaris ) was utilized to ferment cornmeal by solid state fermentation. The main objective of this study was to investigate effect of fermentation on the dynamic state of water and microstructure distribution of water within cornmeal with Low-field nuclear magnetic resonance, as well as the effect on composition and microstructure properties. The spin–spin relaxation time (T 2 ) showed significant changes in solid-state fermented cornmeal. Principal component analysis further revealed that the variations within different fermentation stage could be discriminated by the T 2 parameters. Bulk water (T 22 ) was the main form of water present and lost in substrates. The weights of different indicators, as assessed by multiple regression analysis, demonstrated that there was a strong correlation between starch and T 2 relaxation. Scanning electron microscopy demonstrated that fermentation can cause the appearance of micropores. The longer relaxation time of T 22 during logarithmic period can be interpreted as a loosening of the structure at the starch hydrolysis, introducing more water into the structure. Thus, the differences in composition and structure of the substrate at different fermentation time produce different T 2 values.
研究领域:
食品科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xiaoning Wang,Jinping Jia,Yalin Wang
Hydrodynamic cavitation is a promising technology for wastewater treatment. In this study, TiO 2 (P25) photocatalytic degradation of tetracycline, an antibiotic compound extensively used and environmentally hazardous, was conducted with hydrodynamic cavitation employed simultaneously. Many factors, such as initial tetracycline concentration, solution pH and presence of inorganic anions, were explored. Kinetics were investigated at varied contaminant concentrations, and the pseudo-first-order rate constant for tetracycline photocatalysis coupled with hydrodynamic cavitation was 1.5–3.7 times of the sum of those for the individual processes. These results indicated that a synergistic effect occurred in the combined method. Tetracycline degradation was pH-dependent and favored at alkaline pH. The presence of HCO 3 − in the medium induces promotive effect on the photocatalytic degradation of tetracycline in the presence of hydrodynamic cavitation, while sulfate and chloride exhibit only minor effect. UV/Vis spectra, Fourier transform infrared (FTIR) adsorption spectra and liquid chromatography–mass spectra (LC–MS) were used to evaluate the degradation mechanism. Scanning electron microscopic (SEM) images of TiO 2 confirmed that hydrodynamic cavitation can prevent photocatalytic particles from agglomeration.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 66
·41667-41674
·
IF 3.108
Shihan Yan,Hua Zhang,Zhongbo Yang,Mingjie Tang,Mingkun Zhang,Chunlei Du,Hong-Liang Cui,Dongshan Wei
Methylene blue (MB) as an important dye and medicine, has several different crystalline hydrates. These MB hydrates can transform from one to another at different temperatures or humidities. Determination of these hydrates is a big challenge for traditional spectroscopic technologies like infrared spectroscopy (IR) and Raman spectroscopy due to the component and structure similarities among these hydrates. We present a terahertz (THz) spectroscopy technology to differentiate three typical MB hydrates: pentahydrate, dihydrate and anhydrate. The pentahydrate exhibits prominent THz absorption features at 0.84 and 1.68 THz, and the dihydrate exhibits a broad and weak absorption peak at 0.89 THz, while the anhydrate has no obvious characteristic absorption peak at the measured spectral range of 0.2–2.0 THz. The dehydration kinetics of MB hydrates is investigated according to the variation of one of the main THz characteristic absorption peaks of MB pentahydrate with the heating time at different heating temperatures. A clear relation between the dehydration rate and the heating temperature can be fitted by an Arrhenius equation. The fitted activation energy of 64.5 kJ mol−1 is quite consistent with the enthalpy change due to the transformation of MB pentahydrate to MB anhydrate reported in a previous study.
研究领域:
化学
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药学
·
光谱学
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DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Jinxin Zhang,Xiaoping Luo,Zhenfei Feng
In this study, electrohydrodynamic (EHD) and nanofluid were synergistically employed to improve minichannel flow boiling. R141b, TiO 2 /R141b and TiO 2 /Span80/R141b nanofluids are employed as working fluids. Flow boiling characteristics in minichannels under electric field were evaluated experimentally. Laser confocal microscope was used to examine the effect of EHD and surfactant on nanofluid stability, particularly nanoparticle deposition on heated surfaces. Electric field can effectively enhance heat transfer, and the enhancement is more significant for nanofluids compared to pure fluid. Heat transfer performance is higher for TiO 2 /R141b than TiO 2 /Span80/R141b, while TiO 2 /Span80/R141b shows higher pressure drop than TiO 2 /R141b. The maximum enhancement ratio of 1.58 and 1.85 is found for TiO 2 /R141b and TiO 2 /Span80/R141b under electric field. Besides, heat transfer mechanism enhanced by EHD and nanofluid was discussed. Nanofluid stabilization induced by electric field and surfactant play crucial role in EHD enhancement for nanofluid. The findings suggest that TiO 2 /Span80/R141b nanofluid is well-suited for integration with EHD.
研究领域:
热力学
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流体力学
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DOI
高影响因子
JOURNAL OF CONTAMINANT HYDROLOGY
·
2025
·
IF 4.4
Jianxin Fan,Jiaxin Yang,Ting Duan,Yuchen Gong,Jiaoxia Sun
The widespread use of sulfamethoxazole (SMX) has led to pervasive antibiotic contamination in aquatic environments, where suspended particulate matter (SPM) serves as a critical mediator in the retention, transport, and fate of antibiotic pollutants within riverine ecosystems. However, existing research predominantly emphasizes adsorption mechanisms under static batch equilibrium conditions, overlooking the dynamic interplay between SPM and antibiotics across hydrodynamic conditions regimes.Thus, the dynamic adsorption process of SMX on SPM was investigated through a series of annular flume experiments, and the MIKE 21 model was employed to simulate the migration of SMX and SPM. Results showed that the SMX adsorption amounts decreased significantly with increasing flow velocity, and the SMX desorption would occur when hydrodynamic conditions changed suddenly, especially for the continuous enhancement in velocity. As hydrodynamics stabilized, the re-adsorption of SMX would occur. The adsorption process of SMX was related with the property changes of SPM, and the enhancement of hydrodynamic conditions can significantly weaken the surface complexation between SPM and SMX, further resulting in a decrease in the SMX adsorption amounts. Meanwhile, high flow velocity would cause more obvious pore filling of SMX on SPM and led the clearer SMX adsorption fluctuations under the varying the hydrodynamic conditions. The MIKE 21 simulations identified that the continuous enhanced hydrodynamics significantly prolonged the interaction time between SMX and SPM, while the weak hydrodynamics and high SPM concentrations could particularly slow the SMX diffusion downstream.
研究领域:
环境科学
·
生态学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Mengting Weng,Meiqiang Cai,Zhiqun Xie,Chunying Dong,Yu Zhang,Zhijun Song,Yuejin Shi,Micong Jin,Qian Wang,Zongsu Wei
Mass transfer and oxidant utilization are perhaps two of the most critical issues in sulfate radical (SO 4 •− ) based advanced oxidation technologies (AOTs) and their scaled-up implementation. In this study, we propose using hydrodynamic cavitation (HC), considered a green, effective method, to promote both mass transfer and oxidant utilization in zero-valent iron (Fe 0 ) activated persulfate (PS) system. Whilst the BET surface area of Fe 0 was increased by 8 times after HC treatment, concentration of Fe 2+ derived from Fe 0 oxidation is greatly increased for effective PS activation. The reappearance of Fe 0 and Fe 2+ after cavitation ensured a good reusability of the catalyst. Likewise, the impact of pH revealed that TC adsorption on catalyst at acidic pH favored its degradation compared with that at higher pH. With respect to oxidant utilization, it is observed that PS even at a high dosage (2.8 mM) was completed converted within 30 min in the HC-Fe 0 /PS system. According to SEM, TEM, and BET analysis, we conclude that the microjets induced by cavitation bubbles or direct abrasion by HC agitation have contributed to the removal of hydroxide/oxide layers on the Fe 0 surface, thus reactivating its catalytic activity. Given these reasons, we observed up to 97.80% removal of Tetracycline (TC), the model pollutant, with a synergistic coefficient as high as 2.62. After confirming SO 4 •− as the most dominant reactive species, five degradation pathways of TC were proposed given the intermediate evidence from LC-MS/MS analysis and density functional theory (DFT) calculations. Results from this study could provide new insights into the role of HC on PS activation and shed light on the potential implementation of the SO 4 •− -based AOTs for scaled-up wastewater treatments.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Leila Abdoli,Chunhai Guo,Xiuyong Chen,Xiaoyan He,Hua Li
Formation of microbial biofilm on marine structures is crucial for subsequent attachment of macro fouling species and understanding the impact of fluid conditions on formation and growth of the biofilm is essential for preventing biofouling. Here we report the effect of shear stresses generated by laminar and weakly turbulent flow on the adhesion of typical marine bacterium Bacillus sp. biofilm on stainless steel . Numerical simulation was carried out to calculate the distribution of pressure and shear stress applied on adhered bacteria. The shear stress was proportional to both the distance from the center of rotating disk and rotation speed. The stress reached 18 Pa as the flow velocity was 2.4 m/s and the rotation speed was 600 rpm. Further adhesion testing revealed that development of the bacterial biofilm in early stage was unaffected by the shear stresses. However, shear stress regulated the adherence orientations of the bacteria on the steel surface. Turbulent flow obviously shaped development of the architecture of the biofilm, as revealed by CLSM and SEM characterization. Biofilm growth patterns were clearly observed under weakly turbulent flow, however, they were not seen under laminar flow . The microcolonies assumed elongated forms, possibly triggered by exerted pressure drag force. The results give insights into possibly controlling the formation of marine biofilm on marine infrastructures for desired antifouling performances.
研究领域:
微生物学
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海洋科学
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材料科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Lei Zhao,Ziyun Ye,Qilu Xue,Langlang Yi,Guoqian Li,Bo Hu,Ruichan Lv,Jie Tian
The label-free and dynamic single microparticle Raman detection has shown the capability for the chemical and biological heterogeneity investigation of microdroplets, microplastics, and live cells. 3D hydrodynamic focusing of microparticles is essential to this aim. However, current 3D hydrodynamic focusing methods are normally limited by the complex and cleanroom-dependent fabrication as well as the professional operation. Herein, a plug-and-play 3D hydrodynamic focusing Raman platform is developed for label-free and dynamic single microparticle detection. This platform is easily assembled with a coaxial needle for 3D hydrodynamic focusing, a quartz capillary for Raman detection, a 3D printed holder and soft silicone tubes for connection in a plug-and-play manner, which does not need any professional skills and sophisticated conditions. The microparticle 3D hydrodynamic focusing is implemented in the theoretical simulations and experimental validations. Raman intensity of the good focused microparticles is almost 3 times higher than those not focused. The label-free and dynamic single microparticle Raman detection is analyzed by the Poisson distribution. KNN model is established for Raman spectra classification with the accuracy, sensitivity, and specificity up to 100%. R 2 is up to 0.916 with average count of microparticles per element from 0.02 to 0.2. This platform can be used to label-free and dynamically detect in mixed samples with two as well as three types of microparticles. It would become a powerful tool for the label-free and dynamic single microparticle detection such as chemical reaction monitoring inside microdroplets, microplastics detection and classification, noninvasive biosensing of live cells and so on.
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Yongjie Cheng,Fangzhi Mou,Manyi Yang,Shuyi Liu,Leilei Xu,Ming Luo,Jianguo Guan
Long-range communication is ubiquitous among living organisms, but it remains undiscovered among synthetic micro/nanomotors. Here, we report the long-range hydrodynamic communication among synthetic micromotors. With the high activities when powered by a mixed fuel of N 2 H 4 and H 2 O 2 , catalytic micromotors move in a stable oblique head-down orientation and thus generate strong, steady converging phoretic flows near a substrate. Consequently, they can emit robust hydrodynamic signals to trigger neighboring motors within a long range and also initiate an “approach-hit-and-run” response when sensing the signals emitted from others. This hydrodynamic communication can be reciprocal or one-way, intraspecific or interspecific, spontaneous or controllable, and it widely exists in various catalytic micromotor systems. Utilizing the hydrodynamic signal, the micromotor can also act as a leader to gather small particles (followers) and exhibit a biomimetic competitive behavior against others for the followers. This work may facilitate the fabrication of intelligent micro/nanorobots for micromanipulations and biomimetic micro/nanorobotic systems.
研究领域:
化学
·
物理学
·
纳米技术
·
生物工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Kaiyu Yang,Xukeng Weng,Jiahuan Feng,Yongshen Yu,Baolin Xu,Qiuxiang Lin,Qingkai Zhang,Jiaqing Zhuang,Wenjun Hou,Xiaolin Yan,Hailong Hu,Fushan Li
Quantum dot light-emitting diodes (QLEDs) have attracted increasing attention due to their excellent electroluminescent properties and compatibility with inkjet printing processes, which show great potential in applications of pixelated displays. However, the relatively low resolution of the inkjet printing technology limits its further development. In this paper, high-resolution QLEDs were successfully fabricated by electrohydrodynamic (EHD) printing. A pixelated quantum dot (QD) emission layer was formed by printing an insulating Teflon mesh on a spin-coated QD layer. The patterned QLEDs show a high resolution of 2540 pixels per inch (PPI), with a maximum external quantum efficiency (EQE) of 20.29% and brightness of 35816 cd/m2. To further demonstrate its potential in full-color display, the fabrication process for the QD layer was changed from spin-coating to EHD printing. The as-printed Teflon effectively blocked direct contact between the hole transport layer and the electron transport layer, thus preventing leakage currents. As a result, the device showed a resolution of 1692 PPI with a maximum EQE of 15.40%. To the best of our knowledge, these results represent the highest resolution and efficiency of pixelated QLEDs using inkjet printing or EHD printing, which demonstrates its huge potential in the application of high-resolution full-color displays.
研究领域:
材料科学
·
显示技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Keyao Li,Chunyu Shi,Yanqi Zeng,Lingyun Huang,Bo Chen,Cheng Liu,Shenxu Bao,Siyuan Yang
The presence of hazardous impurities such as phosphorus, fluoride and silicon in phosphogypsum (PG) is a significant obstacle to its large-scale utilization, and the conventional method of stirring water washing (SWW) is often ineffective in removing these impurities. This study innovatively applies hydrodynamic cavitation pretreatment (HCP) combined with froth flotation to purify PG. Computational fluid dynamics was used to determine the optimal parameters for the cavitation tube. During the pretreatment stage, HCP significantly outperformed SWW in removing soluble phosphorus and fluoride. When combined with flotation for further removal of undissolved silicon, HCP continued to play a more positive role. The proposed novel method increased the purity of PG from 81.0 % to 97.27 % with a recovery rate of 83.81 %, obtaining acceptable gypsum products. Analytical tests indicate that HCP effectively disrupts the crystal structure of PG. In addition, HCP enhanced the adsorption amount of collectors on the target mineral surfaces. Molecular dynamics simulations further confirm that both 1231 and DDA exhibit higher adsorption energies on the surfaces of quartz and PG with HCP. Thus, this study proposes a novel approach for the green and efficient treatment of PG, laying the theoretical and technical foundation for the high-value unitization of massive solid waste.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2019
·
IF 7.279
Guanshu Li,Ludong Yi,Jun Wang,Youtao Song
In this paper, a novel method, hydrodynamic cavitation (HC) combined with Fe 3+ -doped TiO 2 , for the degradation of organic pollutants in aqueous solution is reported. The venturi tubes with different geometric parameters (size, shape and half divergent angle) are designed to obtain a strong HC effect. The structure, morphology and chemical composition of prepared Fe 3+ -doped TiO 2 as catalyst are characterized via using XRD , SEM, TEM , XPS, UV-vis DRS and PL methods. The effects of added TiO 2 (heat-treated at different temperatures for different times) and Fe 3+ -doped TiO 2 (with different mole ratios of Fe and Ti) on the HC catalytic degradation of RhB are discussed. The influences of operation parameters including inlet pressure, initial RhB concentration and operating temperature on the HC catalytic degradation of RhB are studied by Box-Behnken design (BBD) and response surface methodology (RSM). Under 3.0 bar inlet pressure for 10 mg/L initial concentration of RhB solution at 40 °C operating temperature in the presence of Fe 3+ -doped TiO 2 with 0.05:1.00 M ratio of Fe and Ti, the best HC degradation ratio can be obtained (91.11%). Furthermore, a possible mechanism of HC degradation of organic pollutants in the presence of Fe 3+ -doped TiO 2 is proposed. Perhaps, this study may provide a feasible method for a large-scale treatment of dye wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）