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Effect of Starch Sources on the Release Rates of Herbicides Encapsulated

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Wuhan University Journal of Natural Sciences 2006年第2期11卷 423-426页

作者： zhu zhifeng YU Cuiyun WANG Liping College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei China The National Test Center for Warp Sizing Southern Yangtze University Wuxi 214122 Jiangsu China

The effects of starch sources on the behaviors of starch matrices and on the rates of herbicides released from the matrices were studied for slow release. The starches considered include native corn starch, wheat starch, potato starch and cassava starch. The matrices were prepared through encapsulating 2,4-dichlorophenoxyacetic or 2,4,5 trichlorophenoxyacetic acids as model herbicides with hot-gelatinized starch pastes. The encapsulation was evaluated in terms of herbicide content, swellability, encapsulation efficiency, and release rate. The results show that starch sources play an important role on the matrix behaviors and on release rates. The rate of 2,4-D released follows the order： wheat starch 〈 potaot starch 〈 corn starch 〈 cassava starch. And for the rate of 2,4,5-T, this order is nearly the same only with an exception that the late two kinds of starch are similar. It is also demonstrated that herbicides with different water solubility show different release rates, no matter what type of starch is used as the matrices.

关键词： starch sources encapsulation slow release herbicide

Spatiotemporal control of femtosecond laser filament-triggered discharge and its application in diagnosing gas flow fields

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Plasma Science and Technology 2022年第2期24卷 73-79页

作者： zhifeng zhu Bo LI Qiang GAO Jiajian zhu Zhongshan LI State Key Laboratory of Engines Tianjin UniversityTianjin 300350People's Republic of China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073People's Republic of China Division of Combustion Physics Lund UniversityLund SE-22100Sweden

Precise control of the discharge in space and time is of great significance for better applications of discharge ***,we used a femtosecond laser filament to trigger and guide a highvoltage DC pulse discharge to achieve spatiotemporal control of the discharge *** space,the discharge plasma is distributed strictly along the channel generated by the femtosecond laser *** breakdown voltage threshold is reduced,and the discharge length is *** time,the electrical parameters such as the electrode voltage and the electrode gap affect discharge delay time and *** optimizing the parameters,we can achieve sub-nanosecond jitter of the *** on the spatiotemporal control of the discharge,we applied filamenttriggered discharge for one-dimensional composition measurements of the gas flow ***,the technique shows great potential in studying the spatiotemporal evolution of discharge plasma.

关键词： femtosecond laser filamentation high voltage discharge discharge plasma spectrum

THE CONVERGENCE OF NONHOMOGENEOUS MARKOV CHAINS IN GENERAL STATE SPACES BY THE COUPLING METHOD

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Acta Mathematica Scientia 2021年第5期41卷 1777-1787页

作者： zhifeng zhu Shaoyi ZHANG Fanji TIAN School of Mathematics and Statistics Hubei Engineering UniversityXiaogan 432000China Hubei Province Key Laboratory of Systems Science in Metallurgical Process(Wuhan University of Science and Technology) Wuhan 430081China Hubei Key Laboratory of Applied Mathematics School of Mathematics and StatisticsHubei UniversityWuhan 430062China

We investigate the convergence of nonhomogeneous Markov chains in general state space by using the f norm and the coupling method,and thus,a sufficient condition for the convergence of nonhomogeneous Markov chains in ... 详细信息

关键词： f norm coupling nonhomogeneous Markov chains convergence

QTL analysis reveals reduction of fruit water loss by NAC042 through regulation of cuticular wax synthesis in citrus fruit

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Horticultural Plant Journal 2022年第6期8卷 737-746页

作者： Hongbin Yang zhifeng zhu Mingfei Zhang Xin Li Rangwei Xu Feng zhu Juan Xu Xiuxin Deng Yunjiang Cheng National R&D Center for Citrus Postharvest Technology Key Laboratory of Horticultural Plant BiologyMinistry of EducationCollege of Horticulture&Forestry SciencesHuazhong Agricultural UniversityWuhan 430070China

Postharvest water loss is a critical factor that determines the quality and shelf life of fresh *** wax constitutes a key barrier to reduce fruit water *** previous study has shown that HJ(Citrus reticulata)has a significantly higher postharvest water loss rate than ZK(Poncirus trifoliata).Here,we investigated the fruit water loss rate of the HJ×ZK F1pseudo-testcross population in 2016 and *** mapping for fruit water loss rate was performed by high-density genetic map and bulk segregant analysis,and QTL9 was identified to be associated with fruit water *** expression of NAC042 from QTL9 in ZK was 170-fold that in *** expression in Arabidopsis showed that NAC042could reduce the water loss of leaves by increasing the cuticular wax content(especially alkanes).Further expression analysis revealed that NAC042 could enhance the expression of many wax-related genes in Arabidopsis leaves,including AtKCS1,AtKCS2,AtKCS9,AtKCS20,At CER1 and At ***,NAC042 might be involved in fruit cuticular wax synthesis to reduce fruit water *** findings provide new insights into the regulation of cuticular wax and fruit water loss as well as valuable information for breeding of citrus with better storability.

关键词： Citrus Cuticular wax Water loss QTL Postharvest

Starch Modification for Slow Release of Herbicide Encapsulated with Concentrated Starch Paste

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Wuhan University Journal of Natural Sciences 2007年第3期12卷 515-521页

作者： zhu zhifeng YU Cuiyun ZHOU Xinhua WANG Liping College of Chemistry and Molecular Science Wuhan University Wuhan 430072 Hubei China National Test Center for Warp Sizing Southern Yangtze University Wuxi 214122 Jiangsu China

An attempt on starch modification has been made to increase the paste concentration of potato starch for reducing the energy consumption required for the encapsulation of herbicide within starch matrix by encapsulating 2, 4-D as model herbicide. The matrix behaviors were evaluated in terms of the herbicide content, capability of swelling in water, encapsulation efficiency, and the rate of herbicide released from the matrix. To increase paste concentration of starch for decreasing the energy consumption in dry process, potato starch was acidified before the encapsulation. However, the matrix prepared in such a way showed that it weakened the control to the herbicide encapsulated, which increased the rate of herbicide released from the matrix. By introducing covalent bonds among starch molecules, the problem with the control and release rate can be completely solved. Moreover, the effects of formaldehyde amount, medium pH, herbicide content, and particle size on the matrix behaviors and release rate were also investigated. The newly developed matrix shows low capability of swelling and slow release, and reduces water evaporation in dry process by about 40% during matrix preparation.

关键词： starch encapsulation slow release herbicide matrix preparation

CTAB Assisted Synthesis of CuS Microcrystals:Synthesis,Mechanism,and Electrical Properties

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Journal of Materials Science & Technology 2013年第11期29卷 1047-1052页

作者： Chunyan Wu Guofang Zhou Dun Mao Zihan Zhang Yiliang Wu Wenjian Wang Linbao Luo Li Wang Yongqiang Yu Jigang Hu zhifeng zhu Yan Zhang Jiansheng Jie School of Electronic Science and Applied Physics Hefei University of Technology Institute of Functional Nano & Soft Materials(FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials &Devices Soochow University

CuS microcrystals were successfully prepared through a mild solvothermal reaction in ethylene glycol （EG） with the assistance of cationic surfactant cetyltrimethylammonium bromide （CTAB）. An interesting morphology evolution from flower-like microspheres to hollow microspheres, and finally to smooth nanoflakes was observed when increasing the amount of CTAB. The products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and UV-vis spectroscopy. It was found that the amount of CTAB played an important role in determining the morphology of the CuS microcrystals. Electrical measurement reveals that the as-prepared CuS microspheres were of high conductivity, which might favor their device applications. It is expected that CuS microcrystals with controlled morphologies and structures will have important applications in solar cells. This simple but effective method could also be extended to the controlled growth of other inorganic microcrystals.

关键词： Copper sulfide Microcrystals Solvothermal Cationic surfactant cetyltrimethylammonium bromide (CTAB) Electrical conductivity

马来酸酯化及磺基丁二酸酯化对淀粉浆液老化与薄膜性能的影响

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高分子材料科学与工程 2015年第2期31卷 77-80,87页

作者：李伟祝志峰江南大学生态纺织教育部重点实验室江苏无锡214122

以淀粉膜的断裂强度、断裂伸长、耐挠曲疲劳性、水溶性和吸湿率为量化指标,通过对淀粉进行马来酸酯化和磺基丁二酸酯化变性,研究了2种变性淀粉浆液老化对淀粉膜力学性能的影响。结果表明,2种变性均能缓解淀粉浆液老化对淀粉膜力学性能... 详细信息

以淀粉膜的断裂强度、断裂伸长、耐挠曲疲劳性、水溶性和吸湿率为量化指标,通过对淀粉进行马来酸酯化和磺基丁二酸酯化变性,研究了2种变性淀粉浆液老化对淀粉膜力学性能的影响。结果表明,2种变性均能缓解淀粉浆液老化对淀粉膜力学性能的负面影响,改善淀粉在较低温度下的成膜能力,提高淀粉膜的韧性。对于改善淀粉浆液的抗老化性,提高淀粉薄膜的力学性能,磺基丁二酸酯化作用优于马来酸酯化作用。

关键词：淀粉薄膜马来酸酯化磺基丁二酸酯化力学性能

电位和变性程度对季铵阳离子醚化-磺基丁二酸酯化淀粉薄膜性能的影响

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高分子材料科学与工程 2015年第11期31卷 70-74页

作者：李伟祝志峰江南大学生态纺织教育部重点实验室江苏无锡214122

以淀粉薄膜的断裂强度、断裂伸长率、耐挠曲疲劳性、水溶性和吸湿率为量化指标,通过对淀粉进行季铵阳离子醚化-磺基丁二酸酯化变性,合成季铵阳离子醚化-磺基丁二酸酯化淀粉(QSS),研究了电位和变性程度对QSS膜性能的影响。结果表明,季铵... 详细信息

以淀粉薄膜的断裂强度、断裂伸长率、耐挠曲疲劳性、水溶性和吸湿率为量化指标,通过对淀粉进行季铵阳离子醚化-磺基丁二酸酯化变性,合成季铵阳离子醚化-磺基丁二酸酯化淀粉(QSS),研究了电位和变性程度对QSS膜性能的影响。结果表明,季铵阳离子醚化-磺基丁二酸酯化变性能明显改善淀粉膜的力学性能;在相似变性程度下,电位对改善QSS膜性能影响不大,而在电中性条件下,变性程度对QSS膜性能具有显著的影响。电中性条件下,随着变性程度的增加,QSS薄膜的断裂伸长率、耐挠曲疲劳性和吸湿率均明显增大,断裂强度明显降低,水溶时间逐渐缩短。由此说明,变性程度是QSS膜性能的主要影响因素。

关键词：淀粉薄膜季铵阳离子醚化-磺基丁二酸酯化力学性能电位变性程度

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浆料成膜机理与浆膜性能的关系

棉纺织技术 2008年第8期36卷 22-25页

作者：祝志峰江南大学

为探索浆料的成膜机理,对浆液在经纱表面的成膜过程进行了分析。通过分析浆膜的形成与作用、浆料的成膜机理,探讨了浆膜在织造过程中的主要作用,从高分子材料学的角度分析了影响浆膜性能的主要因素。认为以现行的浆膜试验来评估浆纱表... 详细信息

为探索浆料的成膜机理,对浆液在经纱表面的成膜过程进行了分析。通过分析浆膜的形成与作用、浆料的成膜机理,探讨了浆膜在织造过程中的主要作用,从高分子材料学的角度分析了影响浆膜性能的主要因素。认为以现行的浆膜试验来评估浆纱表面的浆膜性能只能作为参考数值,试验室所制备浆膜与经纱表面形成的浆膜在成膜条件、成膜基材、内应力、浆膜厚度上有显著区别。

关键词：浆料分子量浆膜成膜机理性能