The purpose of this study is to develop a standard methodology for measuring the surface free energy (SFE),and its component parts of bamboo fiber materials.The current methods was reviewed to determine the surface te...The purpose of this study is to develop a standard methodology for measuring the surface free energy (SFE),and its component parts of bamboo fiber materials.The current methods was reviewed to determine the surface tension of natural fibers and the disadvantages of techniques used were discussed.Although numerous techniques have been employed to characterize surface tension of natural fibers,it seems that the credibility of results obtained may often be dubious.In this paper,critical surface tension estimates were obtained from computer aided machine vision based measurement.Data were then analyzed by the least squares method to estimate the components of SFE.SFE was estimated by least squares analysis and also by Schultz' method.By using the Fowkes method the polar and disperse fractions of the surface free energy of bamboo fiber materials can be obtained.Strictly speaking,this method is based on a combination of the knowledge of Fowkes theory. SFE is desirable when adhesion is required,and it avoids some of the limitations of existing studies which has been proposed.The calculation steps described in this research are only intended to explain the methods.The results show that the method that only determines SFE as a single parameter may be unable to differentiate adequately between bamboo fiber materials,but it is feasible and very efficient.In order to obtain the maximum performance from the computer aided machine vision based measurement instruments,this measurement should be recommended and kept available for reference.展开更多
为探究溴氰菊酯试剂液滴在蕹菜叶片表面的接触角滞后性规律,采用纤维细度分析仪和光学接触角测量仪,观测蕹菜叶面各分割部分的形貌特征,测量溴氰菊酯液滴的表面张力、液滴增加(或减少)过程动态接触角及铺展直径等润湿参数,并依据Equatio...为探究溴氰菊酯试剂液滴在蕹菜叶片表面的接触角滞后性规律,采用纤维细度分析仪和光学接触角测量仪,观测蕹菜叶面各分割部分的形貌特征,测量溴氰菊酯液滴的表面张力、液滴增加(或减少)过程动态接触角及铺展直径等润湿参数,并依据Equation of State法对叶片表面自由能进行计算和分析。结果显示,溴氰菊酯试剂液滴的表面张力在28.92~29.18 mN/m范围内;液滴在叶面的接触角滞后性Δθ范围为7.0°~10.1°,从叶片前端到中端再到末端,接触角滞后性呈先下降后上升的变化趋势。溴氰菊酯试剂液体与蕹菜叶片的表面自由能的大小越接近,越有利于液滴在蕹菜叶面铺展。展开更多
基金the National Natural Science Foundation of China(No.31101085)the Scientific Research and Development Foundation for Start-up Projects of Zhejiang Agriculture and Forestry University (No.2034020044)
文摘The purpose of this study is to develop a standard methodology for measuring the surface free energy (SFE),and its component parts of bamboo fiber materials.The current methods was reviewed to determine the surface tension of natural fibers and the disadvantages of techniques used were discussed.Although numerous techniques have been employed to characterize surface tension of natural fibers,it seems that the credibility of results obtained may often be dubious.In this paper,critical surface tension estimates were obtained from computer aided machine vision based measurement.Data were then analyzed by the least squares method to estimate the components of SFE.SFE was estimated by least squares analysis and also by Schultz' method.By using the Fowkes method the polar and disperse fractions of the surface free energy of bamboo fiber materials can be obtained.Strictly speaking,this method is based on a combination of the knowledge of Fowkes theory. SFE is desirable when adhesion is required,and it avoids some of the limitations of existing studies which has been proposed.The calculation steps described in this research are only intended to explain the methods.The results show that the method that only determines SFE as a single parameter may be unable to differentiate adequately between bamboo fiber materials,but it is feasible and very efficient.In order to obtain the maximum performance from the computer aided machine vision based measurement instruments,this measurement should be recommended and kept available for reference.
文摘为探究溴氰菊酯试剂液滴在蕹菜叶片表面的接触角滞后性规律,采用纤维细度分析仪和光学接触角测量仪,观测蕹菜叶面各分割部分的形貌特征,测量溴氰菊酯液滴的表面张力、液滴增加(或减少)过程动态接触角及铺展直径等润湿参数,并依据Equation of State法对叶片表面自由能进行计算和分析。结果显示,溴氰菊酯试剂液滴的表面张力在28.92~29.18 mN/m范围内;液滴在叶面的接触角滞后性Δθ范围为7.0°~10.1°,从叶片前端到中端再到末端,接触角滞后性呈先下降后上升的变化趋势。溴氰菊酯试剂液体与蕹菜叶片的表面自由能的大小越接近,越有利于液滴在蕹菜叶面铺展。
