Preparation and Properties of Straw Pulp Fiber/Magnetic Nano-Composites

2013 ◽  
Vol 781-784 ◽  
pp. 2641-2644 ◽  
Author(s):  
Quan Xiao Liu ◽  
Yan Na Yin ◽  
Yu Bin Lyu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Magnetic Particles ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Fiber Cells ◽  
Treatment Conditions

Effects of ultrasonic treatment on water-retention value of straw pulp fibers were discussed and the ultrasonic treatment conditions were optimized. The best conditions of ultrasonic treatment as follows: ultrasonic power is 400W, processing time is 90min and temperature is 40°C. SEM shows that a large number of magnetic particles were left inside the pulp fiber cells. Automated Surface Area & Pore Size Analyzer shows a good superparamagnetic behavior.

Study on Effort of Ultrasonic Treatment on Water Retention Value of Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 458-461
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Absorbent Cotton ◽  
Coniferous Wood

Effects of ultrasonic processing conditions on water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber were discussed. Results showed that ultrasonic power and processing time have an significant impact on water retention value of three kinds of pulp, the effort of ultrasonic treatment temperature on water retention value of three kinds of pulp is less. The water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber, respectively, reach the maximum at power of 300W, 500W, 400W, and processing time of 60min, 120min, 60min.

Mercerization and Characterization of Straw Pulp Fibers

2013 ◽  
Vol 781-784 ◽  
pp. 2645-2649
Author(s):  
Yan Na Yin ◽  
Quan Xiao Liu ◽  
Yu Bin Lyu
Keyword(s):  
Cell Wall ◽  
Processing Time ◽  
Water Retention ◽  
Fiber Cell ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall

Effects of mercerizing treatment on water-retention value of straw pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 4mol/L, temperature of 40°C and processing time of 60min. SEM showed that the fiber cell wall swelling increase after mercerization.

Study on Mercerization Orthogonal Experiment of Coniferous Wood Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 454-457
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Water Retention ◽  
Orthogonal Experiment ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall ◽  
Coniferous Wood ◽  
Wood Pulp Fiber

Effects of mercerizing treatment on water-retention value of bleaching coniferous wood pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 7mol/L, temperature of 40°C and processing time of 100min. SEM showed that the fiber cell wall swelling increase after mercerization.

Ultrasonic Treatment of Magnesium Alloy Melts and its Effects on Solidification Microstructures

2007 ◽  
Vol 546-549 ◽  
pp. 129-132 ◽  
Author(s):  
Zi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment ◽  
Solidification Microstructures

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. And increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

Effect of Different Factors on the Fibrillation Degree of Lyocell Fiber Based on Homogenization Treatment

2017 ◽  
Vol 898 ◽  
pp. 2309-2317
Author(s):  
Qiao Li ◽  
Chen Jiang ◽  
Ge Sheng Yang ◽  
Hui Hui Zhang ◽  
Min Min Yu ◽  
...  
Keyword(s):  
Water Retention ◽  
Orthogonal Experiment ◽  
Polarized Light ◽  
Characteristic Parameter ◽  
Water Retention Value ◽  
Homogenization Treatment ◽  
Factors Affecting ◽  
Treatment Conditions ◽  
Extreme Difference ◽  
Lyocell Fiber

The homogenization treatment was performed to fibrillate Lyocell fiber, and then the effects of different factors including NaOH concentration, homogeneous time, temperature and bath ratio on the fibrillation degree of Lyocell fiber were investigated through the orthogonal experiment. Various characterization techniques were employed to compare the fibrillation degree of Lyocell fiber. The polarized light microscope (POM) and scanning electron microscope (SEM) were used to observe the appearance of the fiber after different treatment, and the results showed that it was a quick and efficient approach to obtain the fibrillated Lyocell fiber by homogenization treatment, and the fibrillation degree of fibers varied with different treatment conditions. The results of water retention value (WRV) and the characteristic parameter of the fibrillation degree revealed that the ranking of factors affecting the fibrillation degree of fibers was NaOH concentration > homogeneous time > temperature > bath ratio, using the extreme difference analysis and variance analysis methods. The degree of fibrillation was influenced dominantly by NaOH concentration, rather than any other three factors. By means of BET test, the specific surface area of treated fiber showed a similar trend with WRV, and they matched well with fibril amount on the fibers observed by SEM.

Network swelling of TEMPO-oxidized nanocellulose

Holzforschung ◽  
2015 ◽  
Vol 69 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Thad C. Maloney
Keyword(s):  
Differential Scanning Calorimetry ◽  
Water Retention ◽  
Nanofibrillated Cellulose ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Scanning Calorimetry ◽  
Feasible Method ◽  
Centrifugal Method ◽  
Solute Exclusion ◽  
Fiber Matrix

Abstract: This study examines the swelling of TEMPO-oxidized nanofibrillated cellulose (NFCTEMPO, shortly NFC) on both the particle and interparticle levels. The sum of the intraparticle and interparticle swelling is referred to as the network swelling. A centrifugal method, based on a modification of the water retention value test, was used to measure the network swelling of NFC, a pigment, and some pulp fibers. It was found that the network swelling of NFC is highly dependent on its concentration within a fiber matrix. The particle swelling of NFC and pulp fibers was analyzed by differential scanning calorimetry (DSC) and solute exclusion. The counterion for the NFC varied among the Na+, H+, and Ca2+ forms. The counterion has a very large effect on the particle and network swelling of NFC, with Ca2+ giving the lowest swelling and Na+ the highest swelling. An industrially feasible method for changing the counterion of NFC from the nominal Na+ to the Ca2+ form, and thus improving dewatering properties, is given.

Significant contribution of fibrils on pulp fiber surface to water retention value

2020 ◽  
Vol 35 (1) ◽  
pp. 96-105
Author(s):  
Minoru Kimura ◽  
Takashi Ishida ◽  
Yuko Ono ◽  
Miyuki Takeuchi ◽  
Akira Isogai
Keyword(s):  
Cell Walls ◽  
Kraft Pulp ◽  
Water Retention ◽  
Structural Changes ◽  
Significant Contribution ◽  
Fiber Surface ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Bleached Kraft Pulp ◽  
Two Factors

AbstractThe contribution of structural changes of softwood bleached kraft pulp (SBKP) fibers and partly dried SBKP handsheets to their water retention values (WRVs) was studied. Two factors related to mesopores and macropores, which were determined for super critical point (SCP)-dried SBKP sheet samples, should participate in the WRVs determined for wet SBKP sheet samples. The mesopores are formed during pulping/bleaching to remove lignin and a part of hemicelluloses that are present originally in wood cell walls. The combined volumes of mesopores and macropores (totally < ∼0.6 g g−1) in SBKP fibers after SCP drying were significantly lower than the entire WRV (∼1.6 g g−1) of the original never-dried SBKP. We hypothesize that external fibrils of SBKP fibers are formed during pulping, bleaching, washing, pressure-screening, and pressing processes at high and low solid contents in water under high shear forces. The WRV can be used as an indicator to evaluate such structural changes of external fibrils in pulp fibers and paper sheets during drying/wetting in papermaking process as well as in use under various conditions. In contrast, changes in mesopore and macropore volumes determined for SCP-dried sheets cannot properly detect such structural changes of external fibrils.

Effect of Ultrasonic Treatment on Microstructures of Mg-Ca Binary Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 677-680
Author(s):  
Zhi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. Increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

The correlation between the water retention values of fibers by the centrifugation method and maximum content of fiber bonding water by the headspace GC method

2019 ◽  
Vol 34 (3) ◽  
pp. 304-309 ◽  
Author(s):  
Ruo-Yun Wang ◽  
Wen-Xuan Mo ◽  
Xiao-Nin Shen ◽  
Bo Li ◽  
Xin-Sheng Chai
Keyword(s):  
Gas Chromatography ◽  
Water Retention ◽  
Headspace Gas Chromatography ◽  
Pulp Fibers ◽  
Excellent Correlation ◽  
Water Retention Value ◽  
Headspace Gas ◽  
Centrifugation Method ◽  
Maximum Content ◽  
Headspace Gc

Abstract This work conducted an investigation on the water retention value (WRV) of pulp fibers measured by the conventional centrifugation method (with a screen filter) and the maximum content of fiber bonding water (MCFBW) measured by a headspace gas chromatography (HS-GC), a method with no fine loss, developed recently. The results showed there is an excellent correlation ({R^{2}}=0.988) between these two methods. However, the WRVs measured by the centrifugation method are consistent lower than the MCFBWs from the HS-GC method and the absolute differences were significantly increases for the refined pulp fibers, i. e., about 50–70 compared to 30+ for the pulps without treatment. The information from this study provides the insight of the real WRVs of the pulps from different processes.

scholarly journals Ultrasonication of Thawed Huyou Juice: Effects on Cloud Stability, Physicochemical Properties and Bioactive Compounds

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1695
Author(s):  
Xinyue Zhou ◽  
Wenjun Wang ◽  
Xiaobin Ma ◽  
Enbo Xu ◽  
Donghong Liu
Keyword(s):  
Physicochemical Properties ◽  
Bioactive Compounds ◽  
Ultrasonic Treatment ◽  
Frozen Storage ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Ultrasonic Power ◽  
Minimal Impact ◽  
Sedimentation Behavior ◽  
Thawing Process

In order to remove the flocculent precipitation in Huyou juice after frozen storage and thawing process, the thawed juice was ultrasonically treated with different power (45–360 W) and time (10–60 min) in ice bath (~0 °C), and its sedimentation behavior during storage was observed. After optimization, the cloud stability of juice could be improved by ultrasonic treatment with ultrasonic power of 360 W or more for at least 30 min, which could be stable during 7 days of storage at 4 °C. Under this optimal condition (360 W, 30 min), the effects of ultrasound on the physicochemical properties and bioactive compounds of thawed Huyou juice during storage were investigated. The results showed that with smaller particle size and lower polymer dispersity index, ultrasonic treatment did not significantly change the color, soluble solids, titratable acidity, and bioactive compounds including flavonoids and other phenolics. In addition, all properties of samples were at the same level during storage. Thus, ultrasound was applicable since it can improve the cloud stability of Huyou juice with minimal impact on its physicochemical properties and nutritional quality compared to the untreated one.

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