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PREPARATION OF NANOMETER ZINC OXIDE BY EVAPORATION METHOD 被引量:3
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作者 A.A.A. Saleh, X.J. Zhai, Y.C. Zhai and Y. FuSchool of Materials and Metallurgy, Northeastern University, Shenyang 110004, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第6期499-504,共6页
Nanometer ZnO particles were synthesized by evaporating of zinc powders of averageparticle size of 370μm studied by XRD, TEM and electron diffraction. The particleswere formed by the oxidation of evaporated zinc vapo... Nanometer ZnO particles were synthesized by evaporating of zinc powders of averageparticle size of 370μm studied by XRD, TEM and electron diffraction. The particleswere formed by the oxidation of evaporated zinc vapor in the air. It was found that the particles range from 70 to 100nm in average particle size. The effect of experimental parameters was investigated, the increase of the air flow-rates reduced the average particle size, while increasing the evaporation temperature and the amount of metal charged increased the average particle size. TEM of the particles collected showed that the crystal habits of particles have a tetrapod-like of wurtzite structure consists of four needle crystals. It was found by electron diffraction that all particles were single crystal. 展开更多
关键词 evaporation method nanometer ZnO needle or tetrapod
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STUDY ON NANOMETER ZINC PARTICLES FABRICATED BY GAS EVAPORATION METHOD 被引量:1
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作者 A.A.A.Saleh X.J.Zhai +2 位作者 Y.C.Zhai Y.Fu A.L.Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2003年第3期161-168,共8页
Nanometer Zn particles with mean diameters 12-100nm made by evaporating its powders in argon gas were studied mainly by X-ray diffraction and electron microscopy. They are collected at various distances and those fact... Nanometer Zn particles with mean diameters 12-100nm made by evaporating its powders in argon gas were studied mainly by X-ray diffraction and electron microscopy. They are collected at various distances and those factors influencing the mean particle size were studied. The optimal synthetic conditions were obtained, i.e., evaporation temperature is 1200℃; argon flow rate is 0.4m3/h; amount of powder charged is 3g; distance from evaporation source is 10cm. It was found that the size of particles was governed by argon flow rate, evaporation temperature, amount of metal charged and distance from the source. The size increases remarkably with distance in the space where no metal vapor exists. This implies that the crystallites grow by coalescence. Electron micrographs and diffraction patterns are reproduced to show the size, shape and state of oxidations. Nanoparticles with definite crystal habits were sometimes observed among those with irregular ones. 展开更多
关键词 gas evaporation method nanometer Zn XRD TEM
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PHOTODEGRADATION OF p-NITROCHLORBENZENE(p-NCB)USING NANOMETER-SIZED ZnO PARTICLES PREPARED BY REACTIVE EVAPORATION METHOD 被引量:1
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作者 A.A.A.Saleh X.J.Zhai +2 位作者 Y.C.Zhai Y.Fu M.M.Elomella School of Materials and Metallurgy,Northeastern University,Shenyang 11O006,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第2期181-188,共8页
Photocatalytic degradations of p-nitrochlorbenzene (p-NCB) with distilled water wereinvestigated with ZnO crystals (catalyst) of 70nm in diameter under UV irradiation.The suitable experimental conditions are determine... Photocatalytic degradations of p-nitrochlorbenzene (p-NCB) with distilled water wereinvestigated with ZnO crystals (catalyst) of 70nm in diameter under UV irradiation.The suitable experimental conditions are determined as: ZnO 0.25g, pH 7, p-NCBconcentration 30mg/L. These variables in terms of the degradation rate have beendiscussed, which was defined as the rate of the initial degradation to the final degrada-tion of p-NCB. When all of the experimental degradation rate values are plotted as afunction of irradiation time, all of the points appeared on a single line for wide range ofp-NCB degradations. On the basis of these results, it has been concluded that at lowerZnO catalyst amount, much of the light is transmitted through the slurry in the con-tainer beaker, while at higher catalyst amount, all the incident photons are observedby the slurry. Degradation rates of p-NCB were found to decrease with increasingsolution pH. It has been concluded that the maximum degradation rate values of p-NCB under principally the same experimental conditions mentioned above are 97.4%,98.8% and 95.5% at 100min respectively. The results suggest that the photocatalyticdegradation is initiated by an oxidation of the p-NCB through ZnO surface-adsorbedhydroxyl radicals. Absorption spectra are recorded using spectrophotometer before andafter UV-irradiation in the wavelength range 200-400nm at room temperature. Itis found that the variation of irradiation time over the range 20-100min resulted inchange in the form of the spectrum linear absorption and a higher maximum valuewill be obtained at longer irradiation time. 展开更多
关键词 reactive evaporation method nano-ZnO particles pnitrochlorbenzene (p-NCB ultraviolet light SPECTROPHOTOMETER CATALYST
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Synthesis and growth mechanism of SiC/SiO2 nanochains by catalyst-free thermal evaporation method in Ar/CO atmosphere 被引量:1
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作者 Xiang-min XIE Zhe-an SU +4 位作者 Dong HUANG Cheng YANG Ya-feng WANG Ding-yu JIANG Qi-zhong HUANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第11期3058-3066,共9页
SiC/SiO2 nanochains were synthesized on a carbon fiber substrate by a catalyst-free thermal evaporation method in the Ar/CO atmosphere.X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR),scanning ele... SiC/SiO2 nanochains were synthesized on a carbon fiber substrate by a catalyst-free thermal evaporation method in the Ar/CO atmosphere.X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)revealed that the as-synthesized SiC/SiO2 nanochains are composed of single-crystalline SiC nanowires and amorphous SiO2 beads.The introduction of CO can promote the formation of SiO2,so that the SiC/SiO2 nanochains are subsequently formed during cooling.In addition,the photoluminescence spectrum of SiC/SiO2 nanochains showed a broad emission peak at around 350 nm,which is ascribed to the oxygen discrepancy in the SiO2 beads as well as the SiC/SiO2 interfacial effect.These findings can provide guidance for further study of the vapor growth of 1D SiC-based materials. 展开更多
关键词 SYNTHESIS growth mechanism SiC/SiO2 nanochains thermal evaporation method carbon monoxide photoluminescence properties
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STRUCTURE IMPROVEMENT AND TEMPERATURE FIELD SIMULATION OF PREPARING NANOPOWDER BY EVAPORATION-CONDENSATION METHOD
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作者 J.S. Bao Y. Yin T.G. Liu Z.Y. Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2008年第3期178-182,共5页
A new apparatus, with a segregable conical water cooling condenser, which is heated by an electric arc using the evaporation-condensation method to prepare carbon-coated nanopowder, has been developed by the authors. ... A new apparatus, with a segregable conical water cooling condenser, which is heated by an electric arc using the evaporation-condensation method to prepare carbon-coated nanopowder, has been developed by the authors. Numerical simulation of the temperature field is done by the ANSYS software, and temperature in the reaction vessel is measured with the help of an experiment, to verify the simulation result. Influence of the temperature field in the reaction vessel, on the process of preparing nanopowder is then discussed simply. It is shown that the segregable conical water cooling condenser and carbon-coated surface process can be used to prepare steady carbon-coated metal nanopowder, at a lower cost and higher yield rate than the traditional structure. Simulation of the temperature field in the apparatus shows that the arc heating method can form a temperature field in the apparatus, which is quite favorable for nanopowder formation. Experiments show that the rational parameters using this apparatus, with the arc heating method to prepare carbon-coated nanopowder are electricity 60-100 A and arc length 5-8 mm. 展开更多
关键词 evaporation-condensation method Electric arc heating Temperature field Condenser structure
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Numerical Simulation and Control of Two-Phase Flow with Evaporation in a Vertical Tube Submitted to a Conjugate Heat Transfer 被引量:2
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作者 Ghazali Mebarki Samir Rahal 《Journal of Energy and Power Engineering》 2013年第7期1282-1292,共11页
A better understanding of two-phase flows with evaporation allows leading to an optimal design of evaporators. For that purpose, numerical simulations are very useful. In this paper, a numerical study has been carried... A better understanding of two-phase flows with evaporation allows leading to an optimal design of evaporators. For that purpose, numerical simulations are very useful. In this paper, a numerical study has been carried out in order to model and simulate the combination of a two-phase flow with evaporation in a vertical tube. The VOF (volume-of-fluid) multiphase flow method and a phase-change model for the mass transfer have been used. For an accurate modeling, the effect of axial conduction has been also taken into account using a conjugate heat transfer model. Since thermal oscillations are undesirable as they can lead to the failure of the tube, flow instabilities have also been analyzed, using FFT (fast Fourier transforms), in order to comprehend their behavior and influence. A control study of the flow instabilities in the tube is also presented. For that purpose tube inlet temperature has been varied using a gain control parameter. 展开更多
关键词 Two-phase flow evaporation VOF method conjugate heat transfer flow instabilities control of instabilities.
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The Application of Synthetic Fuzzy Assessing Method in Measurement and Control System of Plating Solution Evaporator
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作者 周晓兵 费敏锐 陈维刚 《Journal of Donghua University(English Edition)》 EI CAS 2004年第3期134-138,共5页
The synthetic fuzzy assessing method is usually applied to sensory evaluation. The method has simple and reliable virtue, and it is consistent with objective evaluation results. Using this method, system status of pla... The synthetic fuzzy assessing method is usually applied to sensory evaluation. The method has simple and reliable virtue, and it is consistent with objective evaluation results. Using this method, system status of plating solution evaporator is evaluated, and the result is applied to compensate a fuzzy controller. Experimental results have shown the correctness and the validity of the proposed approach. 展开更多
关键词 Plating solution evaporator Synthetic fuzzy assessing method fuzzy control PC-BASED configuration software
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Assessing the Efficacy of Two Indirect Methods for Quantifying Canopy Variables Associated with the Interception Loss of Rainfall in Temperate Hardwood Forests 被引量:1
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作者 Thomas G. Pypker Catherine S. Tarasoff Hong-Suk Koh 《Open Journal of Modern Hydrology》 2012年第2期29-40,共12页
Forest canopy water storage (S), direct throughfall fraction (p) and mean evaporation rate to mean rainfall intensity ratio (E/R) vary between storms and seasonally. Typically, researchers only quantify the mean growi... Forest canopy water storage (S), direct throughfall fraction (p) and mean evaporation rate to mean rainfall intensity ratio (E/R) vary between storms and seasonally. Typically, researchers only quantify the mean growing and dormant season values of S, p and E/R for deciduous forests, thereby ignoring seasonal changes S, p and E/R .Past researchers adapted the mean method, which is usually used to estimate S, p and E/R on an annual or seasonal basis, to estimate the same canopy variables on a per storm basis (individual storm (IS) method). The disadvantage of the IS method is that it requires more expensive equipment and the calculation of the canopy variables is more labor intensive relative to the mean method. The goal of this study was to explore the use of the IS method for northern hardwood forests and to determine whether estimates of S, p and E/R derived by the IS method produce more accurate estimates of rainfall interception loss (In) using the Gash model relative to estimates derived by the mean method. The IS method estimated that S increased from approximately 0.11 mm in the early spring to 1.2 mm in the summer and then declined to 0.24 mm after fall senescence. Direct throughfall decreased from 0.4 in the early spring to 0.11 in the summer, and then increased to 0.4 after leaf senescence. When measurement period estimates of p, S and E/R derived by the IS and mean methods were applied to the Gash model, the modeled estimates of In differed from the measured values by 14.0 mm and 1.3 mm, respectively. Therefore, because the mean method provided more accurate estimates of In, the extra effort and expense required by the IS method is not advantageous for studies in northern hardwood forests that only need to model annual or seasonal estimates of In. 展开更多
关键词 CANOPY Water Storage evaporation Direct THROUGHFALL Gash Model SUGAR MAPLE Mean method IS method
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Characterisation of pore fluid salinity dependent evaporative dewatering of kaolin using dielectric spectroscopy 被引量:1
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作者 Partha Narayan Mishra Thierry Bore +1 位作者 Alexander Scheuermann Ling Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2020年第1期112-125,共14页
Realising the importance of pore fluid salinity on the dewatering behaviour of fine-grained porous systems,the present study systematically investigated such impacts on temporal moisture dynamics of kaolin subjected t... Realising the importance of pore fluid salinity on the dewatering behaviour of fine-grained porous systems,the present study systematically investigated such impacts on temporal moisture dynamics of kaolin subjected to evaporative dewatering.A detailed discussion is provided pertaining to the background processes dictating evaporative dewatering response and corresponding alterations in the dielectric behaviour of kaolin.Frequency dependent dielectric spectra of soil,which can be considered as the fingerprint of the transient changes in the condition of water phase within the pore system of the soil and associated densification,are monitored in real time during dewatering using an open-ended coaxial probe with a vector network analyser.The spatial sensitivity of the coaxial probe has been quantified through layered media approach.Combining the results of volume change behaviour of the material along with its moisture loss response,the study characterised the hydro-mechanical response of the material from the windows of frequency dependent dielectric spectroscopy. 展开更多
关键词 KAOLIN evaporATIVE DEWATERING PORE fluid SALINITY Electromagnetic(EM)methods Vector network analyser Dielectric PERMITTIVITY Sensitivity analysis
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A Stability Indicating Reverse Phase-HPLC Method Development and Validation for the Estimation of Rucaparib in Bulk and Pharmaceutical Dosage Form 被引量:1
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作者 D. Suchitra Satyanarayana Battu 《American Journal of Analytical Chemistry》 2021年第4期96-107,共12页
The research was carried out for establishing a new reverse phase-HPLC stability indicating method for the quantification of Rucaparib. The experiment was determined on Waters HPLC instrument using 996 photo-diode arr... The research was carried out for establishing a new reverse phase-HPLC stability indicating method for the quantification of Rucaparib. The experiment was determined on Waters HPLC instrument using 996 photo-diode array detector. The separation was done by using symmetry C-18 ODS (25 cm × 0.46 cm internal diameter) 5 μm analytical column containing mobile phase of Phosphate buffer (0.02 M) and methanol [65:35% v/v] adjusted pH to 4.8 by adding dilute ortho phosphoric acid. The method was run at 1 ml·min<sup>-1</sup> at 286 nm detection. The drug was eluted at 5.484 min. After developing the method, it was assured for the intended use by validation which was done according to ICH Q2B guidelines. The analytical parameters checked were linearity, accuracy, repeatability, intermediate precision, limit of detection, limit of quantitation, ruggedness and robustness. It was observed that the response of the detector was linear in the range of 6 - 14 μg/ml with correlation coefficient of 0.999. The results of all the parameters were found to be within the acceptance criteria. The stability indicating assay method was established by using the samples generated by forced degradation process. The forced degradation was carried out by subjecting the drug to acid, alkali, thermal, oxidative and photolytic degradation and the results showed that the degradation products were successfully separated from the drug. Hence, this can be applied perfectly later for the analysis of quality of the rucaparib drug. 展开更多
关键词 Rucaparib reverse-phase High Performance Liquid Chromatography method Development VALIDATION
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Research on deposition rate of TiZrV/Pd film by DC magnetron sputtering method 被引量:1
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作者 Jie Wang Bo Zhang +1 位作者 Yan-Hui Xu Yong Wang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2017年第4期44-50,共7页
An accelerator storage ring needs clean ultrahigh vacuum.A TiZrV non-evaporable getter(NEG) film deposited on interior walls of the chamber can realize distributed pumping,effective vacuum improvement and reduced long... An accelerator storage ring needs clean ultrahigh vacuum.A TiZrV non-evaporable getter(NEG) film deposited on interior walls of the chamber can realize distributed pumping,effective vacuum improvement and reduced longitudinal pressure gradient.But accumulation of pollutants such as N_2 and O_2 will decrease the adsorption ability of the NEG,leading to a reduction of NEG lifetime.Therefore,an NEG thin film coated with a layer of Pd,which has high diffusion rate and absorption ability for H_2,can extend the service life of NEG and improve the pumping rate of H_2 as well.In this paper,with argon as discharge gas,a magnetron sputtering method is adopted to prepare TiZrV-Pd films in a long straight pipe.By SEM measurement,deposition rates of TiZrV-Pd films are analyzed under different deposition parameters,such as magnetic field strength,gas flow rate,discharge current,discharge voltage and working pressure.By comparing the experimental results with the simulation results based on Sigmund's theory,the Pd deposition rate C can be estimated by the sputtered depth. 展开更多
关键词 TiZrV-Pd DEPOSITION rates MAGNETRON SPUTTERING method Non-evaporable GETTER
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A Stability Indicating Reverse Phase-HPLC Method Development and Validation for the Estimation of Bimatoprost 0.3% &Timolol 0.5% Pharmaceutical Ophthalmic Dosage Form
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作者 Md. S. Amin Muhammad T. Islam 《American Journal of Analytical Chemistry》 CAS 2022年第12期506-530,共25页
The research was carried out to establish a new reverse phase-HPLC stability indicating method for quantifying Bimatoprost & Timolol in ophthalmic solution. The experiment of Bimatoprost & Timolol in ophthalmi... The research was carried out to establish a new reverse phase-HPLC stability indicating method for quantifying Bimatoprost & Timolol in ophthalmic solution. The experiment of Bimatoprost & Timolol in ophthalmic solution method development was determined on Waters HPLC instrument using a UV Detector. The separation was done by using L11, Zorbex SB phenyl (4.6 mm × 250 mm internal diameter) 5 μm analytical column, containing mobile phase of Phosphate buffer (0.02 M), methanol, and acetonitrile [50:30:20 % v/v]. The method was run at 1 ml·min<sup>-1</sup> at 210 nm for Bimatoprost and 295 nm for Timolol for detection. The drug was eluted at 10.81 min for Bimatoprost and 3.77 min for Timolol. After developing the method, it was assured for the intended use by validation, which was done according to ICH Q2B guidelines. The analytical parameters checked were Specificity/Selectivity, linearity, Range, accuracy, ruggedness, and robustness. It was observed that the response of the detector was linear in the range of 6 - 18 μg/ml with a correlation coefficient of 0.999. The results of all the parameters were found to be within the acceptance criteria. The stability-indicating assay method was established by using the samples generated by the forced degradation process. The forced degradation was carried out by subjecting the drug to acid, alkali, thermal, oxidative, and photolytic degradation, and the results showed that the degradation products were successfully separated from the drug. Hence, this can be applied perfectly later for the quantitative analysis of Bimatoprost 0.3% + Timolol 0.5% Ophthalmic Solution drugs for pharmaceutical use. Currently, there is no official method for Bimatoprost & Timolol combination products in USP or BP. Available research work related to single Bimatoprost or Timolol products was not suitable for testing Bimatoprost and Timolol combination drugs. Additionally, there is no stability-indicating method to test Bimatoprost & Timolol combination products which insist us to do research and develop a new reverse phase-HPLC indicating method which will be faster and more accurate. 展开更多
关键词 BIMATOPROST TIMOLOL reverse-phase High Performance Liquid Chromatography method Development Validation Stability Indicating
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Fast Fatty Acid Analysis by Core-Shell Reversed-Phase Liquid Chromatography Coupled to Evaporative Light-Scattering Detector
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作者 Florence Hubert Céline Loiseau +2 位作者 Francoise Ergan Gaelle Pencréac’h Laurent Poisson 《Food and Nutrition Sciences》 2017年第12期1051-1062,共12页
A high-performance liquid chromatography analysis method with an evaporative light-scattering detector has been developed for the separation and quantitative analysis of free fatty acids in biological matrices. Core-s... A high-performance liquid chromatography analysis method with an evaporative light-scattering detector has been developed for the separation and quantitative analysis of free fatty acids in biological matrices. Core-shell reversed-phase high-performance liquid chromatography separation of 10 free fatty acids is achieved within 10.5 min using a methanol/water (0.05% trifluoroacetic acid) eluent gradient. After optimization, the drift tube and nebulization temperature of the evaporative light-scattering detector was set at 35°C, nitrogen flow-rate at 1.1 standard liter per minute and column temperature at 25°C. All calibration curves showed good regression (r2 > 0.9975). A validation procedure following the International Conference on Harmonisation guidelines was implemented to certify the method. Relative standard deviations did not exceed 1.5% and 4.25% for repeatability and reproducibility respectively. 展开更多
关键词 Free Fatty Acids HPLC evaporative Light-Scattering Detector Core-Shell Technology method Validation
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翅片管蒸发器传热性能的参数灵敏度分析 被引量:1
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作者 宋军军 蔡家斌 李家春 《机械设计与制造》 北大核心 2024年第8期381-384,共4页
采用Sobol´全局灵敏度分析方法,计算出了各个影响参数对传热系数的一阶灵敏度和总灵敏度,探索和分析了单个及多个波纹翅片管参数对波纹翅片管蒸发器传热系数影响的程度和规律,并构建了传热系数与各个参数之间关系的响应面。结果:... 采用Sobol´全局灵敏度分析方法,计算出了各个影响参数对传热系数的一阶灵敏度和总灵敏度,探索和分析了单个及多个波纹翅片管参数对波纹翅片管蒸发器传热系数影响的程度和规律,并构建了传热系数与各个参数之间关系的响应面。结果:从灵敏度数值及响应面的分析皆显示:翅片间距对传热系数的影响最大,翅片厚度的影响次之,质量流量与工资热流密度对传热系数的影响相差不大,但大于管外径的影响;且翅片间距与其余各个因素之间的交互影响在一定范围内极其剧烈,其中翅片间距与翅片厚度之间的交互影响最大,又以质量流率与工质侧热流密度之间的交互影响次之;再者,垂直于风速方向的管间距与平行于风速方向的管间距的灵敏度数值皆为0,说明两者对传热系数的影响可以忽略不计。 展开更多
关键词 Sobol´法 响应面 波纹翅片管
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吸湿排汗功能织物研究现状及展望 被引量:1
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作者 吕帅旗 单学蕾 +1 位作者 闫小微 马崇启 《针织工业》 北大核心 2024年第2期89-94,共6页
文章针对影响织物吸湿排汗性能的因素,从润湿芯吸和蒸发排汗两个方面进行分析,介绍吸湿排汗过程中水分传递及分布的测试方法,综述织物吸湿排汗过程的理论模型,包括毛细管芯吸模型和蒸发排汗模型。研究发现,针对织物内部水分芯吸传递的... 文章针对影响织物吸湿排汗性能的因素,从润湿芯吸和蒸发排汗两个方面进行分析,介绍吸湿排汗过程中水分传递及分布的测试方法,综述织物吸湿排汗过程的理论模型,包括毛细管芯吸模型和蒸发排汗模型。研究发现,针对织物内部水分芯吸传递的理论研究还比较匮乏。最后,结合纺织品的发展现状与趋势,对吸湿排汗织物未来的研究重点、应用前景和绿色化生产进行展望,为织物性能优化与舒适性面料开发提供参考。 展开更多
关键词 吸湿排汗 功能织物 润湿芯吸 蒸发排汗 理论模型 测试方法
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耐高温阻硅垢荧光缓释微球的制备与缓释特征
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作者 李养沛 陈友媛 +3 位作者 乔时轩 李佳兴 彭涛 刘剑 《中国海洋大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第4期133-140,174,共9页
缓释型阻垢剂常用来延长阻垢剂作用距离和时间,但在地热开采等高温循环水中,常规缓释技术释放速度过快导致效果不佳。为增强高温下的缓释效果,本文以耐热材料聚苯乙烯为壁材,以固相/油相/水相溶剂挥发法制备新型阻垢缓释微球,优选了芯... 缓释型阻垢剂常用来延长阻垢剂作用距离和时间,但在地热开采等高温循环水中,常规缓释技术释放速度过快导致效果不佳。为增强高温下的缓释效果,本文以耐热材料聚苯乙烯为壁材,以固相/油相/水相溶剂挥发法制备新型阻垢缓释微球,优选了芯材和乳化剂,探究了制备工艺,并利用荧光技术测试了缓释效率和阻垢效果。结果表明:硅藻土和十六烷基磺酸钠分别适宜用作固相吸附材料和乳化剂;乳化剂浓度为2%,芯材浓度为50 mg/mL,搅拌速度300 r/min为最佳制备条件。制备的微球静态释放时间长达100 h,动态释放时间超过20 h, 20 h阻垢率50%以上。本成果有望为高温循环水提供新型缓释阻垢技术。 展开更多
关键词 溶剂挥发法 缓释特征 硅垢 阻垢剂 荧光
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包覆低共熔溶剂的聚苯乙烯微胶囊吸附Li^(+)的性能研究
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作者 侯晓静 王彦旭 +1 位作者 吴可君 何潮洪 《高校化学工程学报》 EI CAS CSCD 北大核心 2024年第3期384-393,共10页
为实现绿色、低成本从海水中提锂的目标,采用同轴共流微流体技术结合溶剂挥发法制备包覆有低共熔溶剂(甲基三辛基氯化铵/癸酸)的聚苯乙烯微胶囊。所制备的微胶囊颗粒呈均一的球形。将该微胶囊用作萃取Li^(+)吸附剂,系统研究了吸附时间... 为实现绿色、低成本从海水中提锂的目标,采用同轴共流微流体技术结合溶剂挥发法制备包覆有低共熔溶剂(甲基三辛基氯化铵/癸酸)的聚苯乙烯微胶囊。所制备的微胶囊颗粒呈均一的球形。将该微胶囊用作萃取Li^(+)吸附剂,系统研究了吸附时间、吸附温度、溶液pH、初始锂浓度和固液比对Li^(+)吸附量和萃取率的影响。结果表明在吸附Li^(+)水溶液时,微胶囊对Li^(+)的最大吸附量为32 mg·g^(-1)。碱性条件时微胶囊对模拟海水中的Li^(+)吸附分配比为10.22 L·g^(-1)。 展开更多
关键词 微胶囊 提锂 低共熔溶剂 溶剂挥发法 吸附
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蒸发冷却空调室外计算参数生成方法研究
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作者 杨怡 黄翔 +2 位作者 褚俊杰 李红莲 杨柳 《制冷学报》 CAS CSCD 北大核心 2024年第3期104-111,共8页
介绍了现行规范中夏季室外计算参数和设计日的确定方法,并在我国现行规范方法的基础上,根据蒸发冷却技术适应区,选取4个典型城市,形成了以湿球温度为主、干球温度为辅的蒸发冷却空调室外计算参数。提出一种新的设计日确定方法,以台站历... 介绍了现行规范中夏季室外计算参数和设计日的确定方法,并在我国现行规范方法的基础上,根据蒸发冷却技术适应区,选取4个典型城市,形成了以湿球温度为主、干球温度为辅的蒸发冷却空调室外计算参数。提出一种新的设计日确定方法,以台站历史长期观测数据为基准,提取典型城市夏季室外气候日变化特征和趋势,利用逐时系数法获得夏季设计日的数据。结果表明:新方法得到的室外计算干湿球温差降低,蒸发冷却潜力下降,按照现行规范中的方法指导设计会造成设计不足;现行规范中的设计日不能准确反映各地区夏季室外气候的变化趋势,研究提出的逐时系数法得到的设计日数据更符合典型城市的实测数据。 展开更多
关键词 蒸发冷却 室外计算参数 设计日 逐时系数法
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Characterization of amphiphilic dendrimer modified PEG-PLA nanoparticles prepared by a double emulsion-solvent evaporation method
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作者 李欣 庞宁 +1 位作者 李骥 齐宪荣 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2017年第7期521-527,共7页
Drug delivery by nanocarriers requires characterizations of suitable particle size, high drug loading and safety. In this work, we prepared an amphiphilic dendrimer modified PEG-PLA mixed nanoparticles(NPs) by a dou... Drug delivery by nanocarriers requires characterizations of suitable particle size, high drug loading and safety. In this work, we prepared an amphiphilic dendrimer modified PEG-PLA mixed nanoparticles(NPs) by a double emulsion-solvent evaporation(DESE) method. The particle size and drug encapsulation efficacy(EE) were compared to evaluate and optimize the preparation parameters. The mixed NPs had average size ranging from(102±1) nm to(137±5) nm, and the zeta potential turned to positive with incorporation of the amphiphilic dendrimer. The NPs showed different EE of docetaxel(DTX) and paclitaxel(PTX) with higher affinity to more lipophilic PTX. The blank mixed NPs showed little cytotoxicity, and the DTX-loaded NPs could effectively facilitate the antiproliferation activity on PC-3 cells. The NPs could be used as an effective drug delivery system, and its anti-tumor effect is worthy of further study. 展开更多
关键词 PEG-PLA nanoparticles DOCETAXEL PACLITAXEL Double emulsion-solvent evaporation method Amphiphilic dendrimer
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聚丁二酸-共-对苯二甲酸丁二醇酯/氧化镁复合薄膜的制备及性能
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作者 张佳宁 郭睿劼 张杰 《化工新型材料》 CAS CSCD 北大核心 2024年第3期253-256,261,共5页
以聚丁二酸-共-对苯二甲酸丁二醇酯(PBST)为基体,纳米氧化镁(MgO NPs)为抗菌剂,通过溶剂挥发法制备了PBST/MgO纳米复合薄膜,并探讨了复合薄膜在食品包装中的应用。研究了MgO NPs对纳米复合薄膜的机械性能、水蒸汽透过率(WVP)、氧气透过... 以聚丁二酸-共-对苯二甲酸丁二醇酯(PBST)为基体,纳米氧化镁(MgO NPs)为抗菌剂,通过溶剂挥发法制备了PBST/MgO纳米复合薄膜,并探讨了复合薄膜在食品包装中的应用。研究了MgO NPs对纳米复合薄膜的机械性能、水蒸汽透过率(WVP)、氧气透过率(OTR)和紫外阻隔性能的影响。结果表明:MgO NPs的加入改善了PBST基体的力学性能和阻隔性能。与PBST薄膜相比,复合膜的拉伸强度和断裂伸长率分别提高了43.7%和32.2%,水蒸汽透过率和氧气透过率分别降低了28.1%和23.6%,并具有良好的紫外阻隔性能。当MgO NPs质量含量为5%时,复合膜的性能最佳。 展开更多
关键词 聚丁二酸-共-对苯二甲酸丁二醇酯 纳米氧化镁 溶剂挥发法 食品包装
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