Process Optimization of the Preparation of TiO2 Microcapsule Used for Photo-Catalytic Degradation with Ultrasound Irradiation

2012 ◽  
Vol 627 ◽  
pp. 770-774
Author(s):  
Xiao Mei Wang ◽  
Bao Bao Zhao ◽  
Cheng Rong Zhang
Keyword(s):  
Process Optimization ◽  
Ultrasound Irradiation ◽  
Core Material ◽  
Wall Material ◽  
Ultrasonic Power ◽  
Complex Coacervation ◽  
Photo Degradation ◽  
Reaction Solution ◽  
Ultrasonic Time ◽  
Ultrasonic Conditions

Microcapsules were prepared using the complex coacervation method with nano anatase TiO2 as the core material, gelatin/Arabia gum as the wall material, while dispersing TiO2 into the reaction solution using the ultrasonic. The prepared microcapsules can be finished into textiles such as the polypropylene nonwovens, and the microcapsules in the textiles gradually fracture and the anatase TiO2 was released, which would facilitate photo-degradation of the polypropylene nonwovens when exposed in sunlight. The microcapsules size was used as the process optimization evaluation index, and the quadratic general revolving combination design was used to conduct the experiments for obtaining the optimum ultrasonic conditions, and the other progress parameters were the same that used in our early microcapsule preparation. The obtained optimal process for ultrasound is: ultrasonic time is 17min; ultrasonic power is 74W and ultrasound temperature 60 °C.

Study on the Influences of Ultrasonic Conditions on the Dispersion of Multi-Walled Carbon Nanotubes in Reinforced Epoxy

2013 ◽  
Vol 561 ◽  
pp. 47-53
Author(s):  
Yu Mei Ding ◽  
Jian Qiang Wang ◽  
Ying An ◽  
Jian Bo Shao ◽  
Kun Ma ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Operating Conditions ◽  
Suspension Stability ◽  
Ultrasonic Power ◽  
Ultrasonic Time ◽  
Resin Solution ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Ultrasonic Conditions

Absrtract. In this paper, the method of ultrasonic vibration in preparation of multi-walled carbon nanotubes(MWCNTs)/epoxy resin composites was studied. Suspension specimens of MWCNTs/epoxy resin solution prepared by different ultrasonic conditions were compared to find out the influences of operating conditions on dispersion properties. In this study, transmission electron microscopes(TEM) were used to characterize the morphology of the blends and suspension stability was used to evaluate the stability of blends. The results showed that ultrasonic power, ultrasonic time and material quantity have great effect on the dispersion of MWCNTs in epoxy resin solution. Increasing ultrasonic power and time can improve dispersion of MWCNTs, and decreasing material quantity within an appropriate range was helpful to disperse MWCNTs into epoxy resin solution. The results of suspension stability were very similar with TEM results, which demonstrate that suspension stability of MWCNTs/epoxy resin blending could be used as an assistant method to characterize the dispersion of MWCNTs in epoxy resin.

Preparation and Properties Analysis of Slow-Release Microcapsules Containing Patchouli Oil

2013 ◽  
Vol 641-642 ◽  
pp. 935-938 ◽  
Author(s):  
Guang Tao Han ◽  
Zi Ming Yang ◽  
Zheng Peng ◽  
Guang Wang ◽  
Min Zhou ◽  
...  
Keyword(s):  
Ph Value ◽  
Drug Loading ◽  
Uv Spectra ◽  
Core Material ◽  
Wall Material ◽  
Complex Coacervation ◽  
Arabic Gum ◽  
Low Viscosity ◽  
Particle Size Analyzer ◽  
Infrared Spectral

Abstract: The microcapsules containing patchouli oil were prepared using a complex coacervation with chitosan and arabic gum as wall material, patchouli oil as the core material. The different factors influence on the microcapsule properties were investigated by scanning electron microscope, laser particle size analyzer, infrared spectrum and UV spectra. The best conditions for preparing patchouli oil microcapsules were confirmed as follows: the concentration of chitosan with low viscosity 0.5%, arabic gum 4%, and the ratio of wall material to core material was 2: 1. The pH value of the complex coacervation reaction was 4.5, and stirring speed was 800 r/min. The microcapsules were analyzed by Infrared spectral to confirm the patchouli oil had been successfully embedded in the microcapsules. The drug loading and encapsulation efficiency for patchouli was 20.7% and 67.2%, respectively.

Efficient Synthesis of 3,4-Dihydropyrimidin-2(1H)-Ketone Using SbCl3 as Catalyst under Ultrasonic Conditions

2013 ◽  
Vol 316-317 ◽  
pp. 1045-1048
Author(s):  
Jin Lin ◽  
Jing Fen Li ◽  
Bin Bin Zheng ◽  
Xiao Ting Dai ◽  
Jia Feng ◽  
...  
Keyword(s):  
Design Optimization ◽  
Ethyl Acetoacetate ◽  
Orthogonal Design ◽  
Optimization Method ◽  
Raw Material ◽  
Ultrasonic Power ◽  
Efficient Synthesis ◽  
Extraction Technology ◽  
Ultrasonic Time ◽  
Ultrasonic Conditions

In this study, SbCl3 as catalyst to benzaldehyde, ethyl acetoacetate and urea as raw material in the ultrasonic radiation synthesis of 3,4-Dihydropyrimidin-2(1H)-ketone. According to the orthogonal design optimization experiment, optimization method ultrasonic extraction technology, and ultimate pass to get the best synthetic condition for: material ratio 1.0,1.0,1.5(mol), ultrasonic power 100 w, ultrasonic time 2 hours, ultrasonic temperature 65°C, the yield is 61.08%.

Process Optimization for the Finish of PP Spunbonded Nonwovens with Photo-Catalytic Microcapsule

2014 ◽  
Vol 1048 ◽  
pp. 46-51
Author(s):  
Xiao Mei Wang ◽  
Cai Shen Chen
Keyword(s):  
Breaking Strength ◽  
Evaluation Index ◽  
Core Material ◽  
Wall Material ◽  
Orthogonal Rotation ◽  
Complex Coacervation ◽  
Experimental Scheme ◽  
The Core ◽  
Uv Lamp ◽  
Artificial Uv

Microcapsules were prepared using the complex coacervation method with nanoanatase TiO2 as the core material, gelatin/Arabia gum as the wall material. Then the obtained microcapsules were finished to the PP nonwovens to investigate the photocatalytic properties to the nonwovens. The breaking strength decrease of the finished polypropylene nonwoven after irradiated with the artificial UV lamp was the optimization evaluation index, and the four factors including finishing temperature, adhesive concentration, microcapsule concentration and finishing time were used to design the experimental scheme using the second order orthogonal rotation combination design. The data were processed with SAS software, the obtained optimal finish process is: finishing temperature is 22°C, adhesive concentration is 75g/L, microcapsule concentration is 36g/L, and finishing time 25min.

scholarly journals Effects of particle formation behavior on the properties of fish oil microcapsules fabricated using a micro-fluidic jet spray dryer

2020 ◽  
Vol 17 (1) ◽  
pp. 27-36
Author(s):  
Xingxing Xiong ◽  
Shengyu Zhang ◽  
Nan Fu ◽  
Hong Lei ◽  
Winston Duo Wu ◽  
...  
Keyword(s):  
Fish Oil ◽  
Oxidative Stability ◽  
Particle Formation ◽  
Core Material ◽  
Wall Material ◽  
Spray Dryer ◽  
Drying Temperature ◽  
Total Solids ◽  
Formation Behavior ◽  
Solids Content

Abstract Fish oil was encapsulated with whey protein isolate (WPI) as wall material using a Micro-Fluidic Jet Spray Dryer. The effects of core/wall material ratio, drying temperature and total solids content on the properties of microcapsules were studied. Low core/wall material ratios at 1:5 and 1:3 resulted in high encapsulation efficiency (EE) and excellent oxidative stability of microparticles during storage. Reducing the inlet temperature from 160 to 110 °C remarkably decreased EE from around 99 to 64.8%, associated with substantial increases in peroxide value during storage. The total solids content mainly altered the morphology of microcapsules, showing little influence on EE and oxidative stability. We proposed that the different drying conditions impacted on particle formation behavior during spray drying, which could be a crucial factor responsible for the differences in the quality attributes of microparticles. A low core/wall material ratio and high drying temperature facilitated the formation of a rigid protein skin at droplet surface during drying, whereas a high solids fraction in the droplets could limit possible droplet shrinkage. These factors contributed positively to the encapsulation of the lipophilic core material.

scholarly journals Optimization of Ultrasonic-Assisted Extraction, Characterization, and Antioxidant Activities of Polysaccharides From Sojae Semen Praeparatum

2021 ◽  
Vol 16 (5) ◽  
pp. 1934578X2110206
Author(s):  
Yongshuai Jing ◽  
Ruijuan Zhang ◽  
Lan Li ◽  
Danshen Zhang ◽  
Yu Liu ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Deae Cellulose ◽  
Chemical Compositions ◽  
Hydroxyl Groups ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Assisted Extraction ◽  
Ultrasonic Time ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction

In this study, response surface methodology (RSM) was used to optimize the ultrasonic-assisted extraction parameters of Sojae Semen Praeparatum polysaccharides (SSPP-80), the optimum conditions were determined as follows: ultrasonic frequency of 100 W, ultrasonic power of 80 Hz, ultrasonic temperature of 52℃, ultrasonic time of 23 minutes, and liquid to raw material ratio of 40 mL/g. Based on these conditions, polysaccharides extraction rate was 7.72% ± 0.26%. Then, 2 novel polysaccharides (SSPP-80‐1, SSPP-80‐2) were isolated from SSPP by DEAE-cellulose 52 chromatography. The chemical compositions, physicochemical properties, and structure of SSPPs were investigated by simultaneous thermal analyzer (TGA), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FI-IR), and high-performance liquid chromatography (HPLC). The results showed that SSPP-80 and 2 fractions were mainly composed of mannose (Man), glucose (Glc), galactose (Gal), xylose (Xyl), and arabinose (Ara). In addition, the antioxidant activities were evaluated against the DPPH and hydroxyl radical in vitro, the IC50 of SSPP-80, SSPP-80‐1 and SSPP-80‐2 against DPPH free radical were 4.407, 8.267, and 5.204 mg/mL, respectively, whereas the IC50values for removing hydroxyl groups were 5.318, 3.516, and 4.016 mg/mL, respectively. It demonstrated that SSPP-80 and 2 fractions had certain antioxidant activity. Theoretical basis for use of Sojae Semen Praeparatum polysaccharides was provided by this study.

The Dispersion of MWCNTS in Acetone Solution of SAN

2015 ◽  
Vol 1088 ◽  
pp. 8-12
Author(s):  
Xin Long Ling ◽  
Ling Jiao Xie ◽  
Li Ming Zou ◽  
Yi Zhe Wei
Keyword(s):  
Particle Size ◽  
Average Particle Size ◽  
Acetone Solution ◽  
Average Particle ◽  
Ultrasonic Power ◽  
Acrylonitrile Copolymer ◽  
Mass Percent ◽  
Ultrasonic Time ◽  
Styrene Acrylonitrile

MWCNTs were dispersed in acetone solution of styrene-acrylonitrile copolymer (SAN). Four factors which had effect on the average particle size, including the ratio of MWCNTs to SAN, the mass percent of MWCNTs, the ultrasonic power and the ultrasonic time, were studied. The optimal dispersion conditions of MWCNTs in acetone solution of SAN were the ratio of MWCNTs to SAN 1:3, the mass percent of MWCNTs 0.25%, the ultrasonic power 100%, and the ultrasonic time 30 min.

scholarly journals Preparation and Self-Repairing Properties of MF-Coated Shellac Water-Based Microcapsules

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 778 ◽  
Author(s):  
Yijuan Chang ◽  
Xiaoxing Yan
Keyword(s):  
Orthogonal Experiment ◽  
Paint Film ◽  
Great Influence ◽  
Color Difference ◽  
Core Material ◽  
Wall Material ◽  
Formaldehyde Resin ◽  
Stirring Rate ◽  
Water Based ◽  
Four Levels

A self-repairing microcapsule was prepared by emulsion polymerization using melamine formaldehyde resin (MF) as wall material, and a mixture of shellac solution and water-based coating as core material. The orthogonal experiment was carried out through five factors and four levels. The effects of Wcore:Wwall, Wemulsifier:Wcore, stirring rate, Wshellac:Wcoating, Wemulsifier solution:Wcore on the output and coverage rate of microcapsules were studied. The stirring rate has a great influence on the preparation process of the MF-coated shellac water-based microcapsules. When the Wcore:Wwall is 0.8:1, Wemulsifier:Wcore is 3:100, stirring rate is 600 rpm, Wshellac:Wcoating is 1:1, Wemulsifier solution:Wcore is 9:1, the prepared microcapsules have the best shape and size. With the increase in concentration of microcapsules, the color difference and gloss of paint film decreased gradually. The tensile strength, scanning electron microscopy (SEM), infrared spectroscopy and repair effects of the paint film were analyzed. When the concentration of microcapsules was 5.0–10.0%, the comprehensive performance of the paint film was better, providing a technical reference for the self-repairing coatings.

scholarly journals Extraction, Purification, Characterization, and Antiangiogenic Activity of Acidic Polysaccharide from Buddleja officinalis

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xiaoteng Yan ◽  
Zhuan Yan ◽  
Qingping Xiong ◽  
Gaoqin Liu ◽  
Juanjuan Zhu ◽  
...  
Keyword(s):  
Average Molecular Weight ◽  
Acid Group ◽  
Raw Material ◽  
Ultrasonic Power ◽  
Optimal Parameters ◽  
Acidic Polysaccharide ◽  
Antiangiogenic Activity ◽  
Uronic Acid Content ◽  
Ultrasonic Time ◽  
Crude Polysaccharide

Firstly, optimal parameters of crude polysaccharide from Buddleja officinalis were obtained as follows: ratio of water to raw material of 26 : 1, ultrasonic power of 240 W, ultrasonic time of 45 min, and ultrasonic temperature of 62°C. Secondly, acidic polysaccharide (APBOM) from Buddleja officinalis was successfully acquired with the yield of 9.57% by using DEAE-52 cellulose and Sephadex G-100 gel column chromatography. Then, we found that total polysaccharide content of APBOM was 94.37% with a sulfuric acid group of 1.68%, uronic acid content of 17.41%, and average molecular weight of 165.4 kDa. Finally, APBOM was confirmed to have significant antiangiogenic effects.

scholarly journals Preparation and Optimization of Waterborne Acrylic Core Microcapsules for Waterborne Wood Coatings and Comparison with Epoxy Resin Core

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2366 ◽  
Author(s):  
Xiaoxing Yan ◽  
Yu Tao ◽  
Xingyu Qian
Keyword(s):  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Paint Film ◽  
Bath Temperature ◽  
Water Bath ◽  
Core Material ◽  
Wall Material ◽  
Formaldehyde Resin ◽  
The Core ◽  
Resin Core

Microcapsules were prepared by in situ polymerization with urea formaldehyde resin as the wall material and Dulux waterborne acrylic acid as the core material. The effects of the core–wall ratio, water bath temperature and depositing time on the morphology, particle size, yield and encapsulation ratio of microcapsules were investigated by orthogonal experiment of three factors and two levels. The results showed that the core–wall ratio had the greatest influence on the performance of microcapsules. When the core–wall ratio was 0.58:1, the water bath temperature was 70 °C, and the depositing time was 5 d, the microcapsule performance was the best. With the increase in depositing time, the yield of microcapsule particles increased gradually, and the microcapsules appeared to show an adhesive phenomenon. However, the long-term depositing time did not lead to complete deposition and agglomeration of microcapsules. When 10.0% concentration of the waterborne acrylic microcapsules with 0.58:1 of core–wall ratio was added to the coatings, the mechanical and optical properties of the coatings did not decrease significantly, but the elongation at break increased significantly. Therefore, this study offers a new prospect for using waterborne acrylic microcapsules to improve the toughness of waterborne paint film which can be cured at room temperature on a wood surface.

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