WO2019010897A1 - 一种微纳米纤维素的动态表征方法 - Google Patents
一种微纳米纤维素的动态表征方法 Download PDFInfo
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- WO2019010897A1 WO2019010897A1 PCT/CN2017/112637 CN2017112637W WO2019010897A1 WO 2019010897 A1 WO2019010897 A1 WO 2019010897A1 CN 2017112637 W CN2017112637 W CN 2017112637W WO 2019010897 A1 WO2019010897 A1 WO 2019010897A1
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- nanocellulose
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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- the invention relates to the field of characterization of nanofibers of flexible materials, in particular to characterization methods of plant-derived micro-nanocellulose materials
- Micro-nanocellulose has excellent properties, is environmentally friendly, naturally recyclable, biocompatible, and has excellent optical and mechanical properties.
- micro-nano cellulose materials have been applied in various fields, such as cosmetics, biomedicine, construction, food, military, paper, environmental protection, etc., and have great application prospects.
- the main object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a method for characterizing micro-nanocellulose, which uses the existing particle tracking velocity measurement technology to capture micro-circulation observed under a microscope by a CCD camera.
- the nanocellulose in the channel is processed according to the image data captured by the CCD camera to obtain important parameters such as length, diameter, speed and quantity of the nanocellulose.
- the invention provides a dynamic characterization method of micro-nanocellulose, comprising the following steps:
- the step (1) is specifically:
- the 0.1% strength micro-nanocellulose suspension was subjected to intermittent sonication, the intermittent sonication time was 10 min, and the ultrasonic treatment conditions were ultrasonic time 3 s, intermittent time 3 s, power 300 W, temperature 0-4 ° C.
- the speed in a certain suitable speed is in the range of 0-200 um/s. If it is not within the speed range, it takes a period of time to wait for the speed in the channel to decrease.
- step (4) after the photographing, the stage is moved to measure the relevant parameters of the micro-nanocellulose in the microfluidic channel at different positions, including the length, diameter, velocity and quantity parameters of the nanocellulose.
- the method for identifying the micro-nanocellulose particles comprises the following steps:
- the nanofiber particles in the micro-nanocellulose suspension are irradiated by the light source to produce weak scattered light.
- the micro-nano fiber After imaging on a CCD camera, the micro-nano fiber has a different contour from the background, and its center is brighter and the edge is darker, when the micro-nano fiber
- the micro-nano fiber particles move continuously along the flow field, and the optical properties of the suspension and the background during the observation process are stable, so there is no change.
- the imaging of the background on the CCD is invariant, thereby identifying moving nanofiber particles in the video.
- the method for calculating the length and diameter of the nanocellulose is as follows:
- the nanofiber particles can be identified by the background difference. Due to the difference between the gray value and the background color, the outline of the nanofiber particles is extracted by the selected gray threshold, and the nanofiber is determined in the frame image. The outline, and draw a minimum circumscribed rectangle on the fiber outline to enclose the micro-nanocellulose. The long side of the rectangle is the length of the micro-nanocellulose particles, and the length information is recorded in units of pixels; An inscribed circle is formed in the outline of the nanofiber particle, and the diameter of the inscribed circle is the diameter of the nanocellulose particle, and the diameter information is recorded in units of pixels;
- the size of the field of view determined by the magnification of the microscope, and the resolution of the CCD it can be known that in the obtained image, one pixel is used to describe the actual unit length, thereby converting the pixel unit into the length. unit.
- the method for calculating the velocity of the micro-nanocellulose particles is as follows:
- the method for counting the velocity of the micro-nanocellulose particles is as follows:
- the nanocellulose recognized by the system at the inner edge of the field of view is the first one when the nanofibers flow from the inflow side.
- each frame is identified and tracked until it disappears on the other side of the field of view, and the fiber is counted as 1, and so on, while identifying and tracking multiple targets simultaneously.
- a certain amount of nanocellulose particles will be accumulated in a certain period of time, and the system automatically labels the fibers in the order in which the fibers are identified.
- the method is: the nanocelluloses sequentially entered in the field of view are marked as 1, respectively. 2, 3, 4...n, starting from 1, then the end of the video, the fiber number of the system identification is the number of fibers identified in the video.
- the present invention has the following advantages and beneficial effects:
- the invention can perform real-time dynamic tracking measurement on micro-nano cellulose, has short measurement time and large amount of processed information, and can not only measure the length and diameter of nano-cellulose, but also the speed of nano-cellulose in the flow field and The position change; while the above methods such as SEM/TEM/AFM are to measure the size of the solid nanocellulose under a static process, the nanocellulose needs to be dried before the measurement; the existing measurement method for the nanometer The measurement of cellulose has the disadvantages of long time and complicated operation. Compared with the existing research methods, the present invention has the advantages of short use time, simple operation, and multiple characterization parameters at the same time.
- FIG. 1 is a flow chart of a method for dynamically characterizing nanocellulose according to the present invention
- FIG. 2 is a view showing the effect of the nanofiber particles of the present invention after being irradiated by a light source
- FIG. 3 is a schematic view showing a circumscribed rectangle and an inscribed circle of a contour map of nanocellulose particles according to the present invention
- Figure 5 is a view showing the display of nanocellulose of Example 2 in a channel
- Example 6 is a statistical diagram of the number of nanocellulose lengths of Example 2.
- Example 7 is a statistical graph of the number of nanocellulose widths of Example 2.
- Figure 8 is a graph showing the amount of nanocellulose speed in Example 2.
- the dynamic characterization method of the micro-nanocellulose of the embodiment 1 includes the following steps:
- intermittent ultrasonic treatment of 0.1% concentration of micro-nanocellulose suspension intermittent sonication time of 30min, ultrasonic treatment conditions of ultrasonic time 3s, intermittent time 3s, power 300W, temperature 0-4 ° C;
- the method of identifying the micro-nanocellulose particles in the step (5) further comprises the following steps:
- the nanofiber particles in the micro-nanocellulose suspension are irradiated by the light source to generate weak scattered light.
- the effect diagram is shown in Figure 2.
- the micro-nano fiber After imaging on a CCD camera, the micro-nano fiber has a different contour from the background, and its center is brighter. The edge is dark.
- the micro-nano fiber particles move in the field of view, in the continuous frame diagram, the micro-nano fiber particles continuously move along the flow field direction, and the optical properties of the suspension and the background during the observation process. There is no change in stability, so in multiple consecutive frames or even the entire video, the imaging of the background on the CCD is invariant, identifying moving nanofiber particles in the video.
- the method for calculating the length and diameter of nanocellulose is as follows:
- any frame diagram we can identify the nanofiber particles by background difference.
- the outline of the nanofiber particles can be extracted by the selected gray threshold.
- FIG. 3 for the convenience of observation, the image is enlarged several times, and the pixel is more obvious.
- the inscribed circle is a circle that is inscribed in the blue outline and its diameter is also the diameter of the fiber. We first record the size information in pixels.
- the diameter of the inscribed circle shown is approximately 3 pixels (px).
- the circumscribed rectangle as shown in Figure 3, we draw a minimum rectangle around the fiber imaging pattern, enveloping the fiber, and the long side of the rectangle is the length of the fiber, the length of the figure is about 17 pixels ( Px).
- the method for calculating the speed of micro-nanocellulose particles is as follows:
- the method for counting the velocity of micro-nanocellulose particles is as follows:
- the nanocellulose recognized by the system at the inner edge of the field of view is the first one when the nanofibers flow from the inflow side. After identifying the nanocellulose, each frame is identified and tracked until it disappears in the field of view. Side, and count this fiber as 1, and so on, while identifying and tracking multiple targets, a certain amount of nanocellulose particles will be accumulated in a certain period of time, and the system automatically identifies the fibers in the order of fibers. Labeling (the nanocellulose entering in the field of view is labeled as 1, 2, 3, 4...n, respectively), starting from 1, then the end of the video, the fiber number of the system identification is also recognized in the video. The number of fibers to reach.
- NFC nanocellulose nanofibril
- the light source of the microscope is provided by the power module TH4-200.
- the black switch below the panel is opened.
- the light source switch and adjustment knob of the microscope are located in front of the base, the light source switch is on the left side, and the light source intensity adjustment switch is on the right side. After the light source is turned on, the intensity of the light source is adjusted in real time according to the observation situation.
- the position of the stage in the XY axis direction is then adjusted so that the microfluidic channel is aligned with the objective lens during observation.
- the knob below the microscope is the focus knob, the large knob of the outer ring is coarse adjustment, and the small knob with the inner rotation is fine adjustment, and the distance (focal length) between the objective lens and the micro flow channel is adjusted to achieve the best observation distance.
- the dial switch above the microscope is a splitter switch. When it is on the far left side, all the light is entered into the eyepiece for manual observation. When in the middle, half of the light is split into the eyepiece and distributed to the computer imaging system. When it is at the far right. , then all the light into the computer imaging system, which can not be observed at the eyepiece.
- micro-nanocellulose suspension was subjected to intermittent sonication, intermittent sonication time was 30 min, sonication conditions were ultrasonic time 3 s, intermittent time 3 s, power 300 W, temperature 0-4 ° C,
- the sonicated NFC suspension was slowly injected into the microfluidic channel by injection. Since the high magnification objective lens is an oil lens, it is necessary to first drop a special oil drop on the lens, and then search for the channel under the low magnification objective lens, and move the imaging under the low power microscope to the center of the field of view and then switch to the high magnification objective lens. Fine-tuning the focus to the high magnification of the image is clear, as shown in Figure 5.
- the field of view under the microscope is photographed by the imaging unit on the computer workstation, and the video is continuously calculated by the intercepted video, since no subsequent injection is performed.
- the speed of the nanocellulose in the channel will decrease continuously due to the viscous force of the inner wall of the channel.
- the intercepted video is subjected to correlation algorithm operation. The parameters such as the number, length, diameter and speed of the nanocellulose are obtained, as shown in Fig. 6, Fig. 7, and Fig. 8.
- Figure 6 shows the number distribution of nanocellulose length intervals in the range of 600-2000 nm, wherein the number of nanocelluloses is 600-800 nm, and the number of nanocelluloses of 800-1000 nm is the second.
- Figure 7 shows the distribution range of the nanocellulose diameter interval, with the largest number of nanocelluloses in the range of 600-650 nm.
- Figure 8 shows the distribution of the nanocellulose speed in the range of 0-80 um / s, which The largest amount of nanocellulose in 20-30um/s.
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Abstract
Description
Claims (8)
- 一种微纳米纤维素的动态表征方法,其特征在于,包括下述步骤:(1)将微纳米纤维素虚浮液进行间歇式超声处理,处理时间5-10min,时间间隔3S;(2)使用微注射器向微纳米级别的微流通道中注入经过步骤(1)处理后的微纳米纤维素悬浮液;(3)调整显微镜的物镜来保证微流通道在显微镜的视野内且该微流通道是一个清晰的成像,然后在显微镜下观察微纳米纤维素在微流通道中的流动情况,以确认微纳米纤维素在通道中是流动的并保持一定合适的速度;(4)使用显微镜直连的CCD相机拍摄微流通道中的微纳米纤维素,拍摄过程中保持所有位置不变以减少误差,拍摄过后移动载物台来测量不同位置的微流通道内微纳米纤维素的有关参数;(5)将CCD相机拍摄的照片传输至计算机中处理图像数据,根据图像上纳米纤维素粒子与水分的像素粒子灰度不同将它们区别开来;通过在微纳米纤维素粒子轮廓绘制最小外接矩形和内切圆计算纳米纤维素的长度和直径;通过多张帧图中纳米纤维素粒子的中心点位移,计算出纳米纤维素粒子的速度;通过计算在一定时间内流过纳米纤维素的数量,来对数量进行统计。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤(1)具体为:将0.1%浓度的微纳米纤维素悬浮液进行间歇式超声处理,间歇式超声处理时间为10min,超声处理条件为超声时间3s,间歇时间3s,功率300W,温度0-4℃。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤(3)中,保持一定合适的速度中速度的范围是0-200um/s,如果不在该速度范围之内,需要一段时间来等待通道内的速度降低。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤(4)中,拍摄过后移动载物台来测量不同位置的微流通道内微纳米纤维素的有关参数,包括纳米纤维素的长度、直径、速度和数量参数。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤(5)中,包括对微纳米纤维素粒子识别的方法,具体包括下述步骤:微纳米纤维素悬浮液中的纳米纤维粒子经过光源照射,产生微弱的散射光,在CCD相机上成像后,微纳米纤维的轮廓与背景不同,其中心偏亮,边缘偏暗,当微纳米纤维粒子在视场中运动时,在连续的帧图中,微纳米纤维粒子是沿着流场方向不断运动的,而悬浮液和背景在观测过程中的光学特性稳定不会有任何变化,所以在多张连续帧图中甚至整个视频中,背景在CCD上的成像是不变的,从而在视频中识别出运动的纳米纤维粒子。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤(5)中,计算纳米纤维素长度和直径的方法如下:在任一帧图像中,通过背景差异可识别出纳米纤维粒子,由于其灰度值与背景颜色的差异,通过选定的灰度阈值勾出纳米纤维粒子的轮廓,确定纳米纤维在此帧图中的轮廓,并在该纤维轮廓上绘制一个最小外接矩形将微纳米纤维素包络在内,此矩形的长边即是微纳米纤维素粒子的长度,并以像素作为单位来记录长度信息;另外在纳米纤维粒子的轮廓内做内切圆,内切圆的直径即为纳米纤维素的粒子的直径,并以像素作为单位来记录直径信息;依据显微镜的放大倍率确定的视场大小,以及CCD的分辨率,就可以得知,在已获得的图像中,利用一个像素来描述实际中多小的单位长度,由此将像素单位换算为长度单位。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤(5)中,计算微纳米纤维素粒子速度的方法如下:在识别出某特定的纳米纤维粒子后,确定纳米纤维素粒子的成像轮廓的中心点位置,在相邻的两帧图像中,分析同一个纤维的中心点的位移变化,从而得知在特定时间间隔内,纳米纤维素粒子中心点的位移,然后通过V=S/t计算得到这一时刻该粒子的移动速度,而稳定的流场中,通过多张帧图的连续分析,取均值即可得到纳米纤维粒子移动的匀速度。
- 根据权利要求1所述微纳米纤维素的动态表征方法,其特征在于,步骤 (5)中,统计微纳米纤维素粒子速度的方法如下:由于纳米纤维在流动的液体中都是从视场的一侧流入,从另一侧流出,在纳米纤维从流入一侧开始,系统在视场内边缘识别到的纳米纤维素即是第一张,在识别该纳米纤维素后,每一帧都识别出来,并追踪直至其消失在视场的另一侧,并将此纤维计数为1,由此类推,同时进行多个目标的识别追踪,在一定时间段内,就会累计一定数量的纳米纤维素粒子,系统自动以识别出纤维的顺序对纤维进行标号,标号方法是:在视场中按顺序进入的纳米纤维素分别标记为1,2,3,4...n,从1开始,那么截止到视频结束,系统标识的纤维序号也就是视频中识别到的纤维数。
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