Because the volatile content of isoamyl alcohol increases sharply on the seventh day of wheat mildew infection,isoamyl alcohol can be used as an early biomarker of wheat mildew infection.Currently,only a few sensors f...Because the volatile content of isoamyl alcohol increases sharply on the seventh day of wheat mildew infection,isoamyl alcohol can be used as an early biomarker of wheat mildew infection.Currently,only a few sensors for isoamyl alcohol detection have been reported,and these sensors still suffer from low sensitivity and poor moisture resistance.Herein,the isoamyl alcohol sensitivity of 5 at%Er@LaFeO_(3)(ELFO)was enhanced by loading Ag nanoparticles on the surface of the ELFO microspheres,while the optimal operating temperature was reduced.The moisture resistance of Ag/ELFO was improved by the incorporation of g-C_(3)N_(4)nanosheets(NSs)on the surface of Ag/ELFO through electrostatic self-assembly.Given the requirements for practical applications in grain granaries,the sensing behavior of a Ag/ELFO-based sensor incorporating g-C_(3)N_(4)NSs at 20%relative humidity(RH)was systematically studied,and the sensor demonstrated excellent repeatability,long-term stability,and superior selectivity(791 at 50 ppm)for isoamyl alcohol with a low limit of detection(LOD=75 ppb).Furthermore,the practical results obtained for wheat at different mildew stages further confirmed the potential of the g-C_(3)N_(4)/Ag/ELFO-based sensor for monitoring the early mildew stage of wheat.This work may offer guidance for enhancing the moisture resistance of gas-sensitive materials through the strategy of employing composite nanomaterials.展开更多
为了研究不同比例的异戊醇/柴油混合燃料在4190Z L C-2型船用中速柴油机中的燃烧和排放特性,运用AVL_FIRE仿真软件建立柴油机燃烧室模型,并通过台架实验验证其仿真模型的准确性。在仿真软件中通过调整异戊醇在柴油中的掺混比来研究混合...为了研究不同比例的异戊醇/柴油混合燃料在4190Z L C-2型船用中速柴油机中的燃烧和排放特性,运用AVL_FIRE仿真软件建立柴油机燃烧室模型,并通过台架实验验证其仿真模型的准确性。在仿真软件中通过调整异戊醇在柴油中的掺混比来研究混合燃料对柴油机燃烧和排放性能的影响。结果表明:掺混异戊醇有助于改变NO的生成规律,使NO在速燃期的生成量上升,在缓燃期与后燃期的生成量减少,并且总体生成的NO质量分数降低;随着异戊醇掺混比的上升,CO最终生成质量分数下降,Soot最终生成质量分数上升,同时生成的Soot质量分数峰值降低,在缓燃期的氧化速率增快,并因为较快的耗氧量使得最终生成的Soot质量分数比纯柴油的高。展开更多
在50.00和101.33 k Pa下,采用改进的Rose汽液平衡釜测量乙酸异戊酯+异戊醇和乙酸异戊酯+正己醇体系的汽液平衡数据。乙酸异戊酯+异戊醇在50.00 k Pa下形成最低共沸物。使用Herington法对汽液平衡数据进行热力学一次性检验,结果表明测得...在50.00和101.33 k Pa下,采用改进的Rose汽液平衡釜测量乙酸异戊酯+异戊醇和乙酸异戊酯+正己醇体系的汽液平衡数据。乙酸异戊酯+异戊醇在50.00 k Pa下形成最低共沸物。使用Herington法对汽液平衡数据进行热力学一次性检验,结果表明测得的汽液平衡数据符合热力学一致性。对实验数据使用NRTL、Wilson和UNIQUAC活度系数模型进行关联,回归获得相应的二元交互参数,模型计算的温度和组成与实验值相比均方差小于0.20 K和0.0050,表明3种模型的拟合结果与实验数据吻合较好。通过Wilson模型预测乙酸异戊酯+异戊醇体系在98.4 k Pa时共沸点消失。为化工数据库增添了内容,为乙酸异戊酯体系的工程设计和进一步深入研究奠定了基础。展开更多
基金supported by the Outstanding Youth Foundation of Jiangsu Province of China(No.BK20211548)the Qinglan Project of Yangzhou University,and the Yangzhou Science and Technology Plan Project(No.YZ2023246).
文摘Because the volatile content of isoamyl alcohol increases sharply on the seventh day of wheat mildew infection,isoamyl alcohol can be used as an early biomarker of wheat mildew infection.Currently,only a few sensors for isoamyl alcohol detection have been reported,and these sensors still suffer from low sensitivity and poor moisture resistance.Herein,the isoamyl alcohol sensitivity of 5 at%Er@LaFeO_(3)(ELFO)was enhanced by loading Ag nanoparticles on the surface of the ELFO microspheres,while the optimal operating temperature was reduced.The moisture resistance of Ag/ELFO was improved by the incorporation of g-C_(3)N_(4)nanosheets(NSs)on the surface of Ag/ELFO through electrostatic self-assembly.Given the requirements for practical applications in grain granaries,the sensing behavior of a Ag/ELFO-based sensor incorporating g-C_(3)N_(4)NSs at 20%relative humidity(RH)was systematically studied,and the sensor demonstrated excellent repeatability,long-term stability,and superior selectivity(791 at 50 ppm)for isoamyl alcohol with a low limit of detection(LOD=75 ppb).Furthermore,the practical results obtained for wheat at different mildew stages further confirmed the potential of the g-C_(3)N_(4)/Ag/ELFO-based sensor for monitoring the early mildew stage of wheat.This work may offer guidance for enhancing the moisture resistance of gas-sensitive materials through the strategy of employing composite nanomaterials.
文摘为了研究不同比例的异戊醇/柴油混合燃料在4190Z L C-2型船用中速柴油机中的燃烧和排放特性,运用AVL_FIRE仿真软件建立柴油机燃烧室模型,并通过台架实验验证其仿真模型的准确性。在仿真软件中通过调整异戊醇在柴油中的掺混比来研究混合燃料对柴油机燃烧和排放性能的影响。结果表明:掺混异戊醇有助于改变NO的生成规律,使NO在速燃期的生成量上升,在缓燃期与后燃期的生成量减少,并且总体生成的NO质量分数降低;随着异戊醇掺混比的上升,CO最终生成质量分数下降,Soot最终生成质量分数上升,同时生成的Soot质量分数峰值降低,在缓燃期的氧化速率增快,并因为较快的耗氧量使得最终生成的Soot质量分数比纯柴油的高。
文摘在50.00和101.33 k Pa下,采用改进的Rose汽液平衡釜测量乙酸异戊酯+异戊醇和乙酸异戊酯+正己醇体系的汽液平衡数据。乙酸异戊酯+异戊醇在50.00 k Pa下形成最低共沸物。使用Herington法对汽液平衡数据进行热力学一次性检验,结果表明测得的汽液平衡数据符合热力学一致性。对实验数据使用NRTL、Wilson和UNIQUAC活度系数模型进行关联,回归获得相应的二元交互参数,模型计算的温度和组成与实验值相比均方差小于0.20 K和0.0050,表明3种模型的拟合结果与实验数据吻合较好。通过Wilson模型预测乙酸异戊酯+异戊醇体系在98.4 k Pa时共沸点消失。为化工数据库增添了内容,为乙酸异戊酯体系的工程设计和进一步深入研究奠定了基础。
