Preparation of Anti-Mosquito Microcapsule Finishing Agent

2013 ◽  
Vol 821-822 ◽  
pp. 1353-1357 ◽  
Author(s):  
Jun Hua Wang ◽  
Gang Huang ◽  
Yong Tang Jia
Keyword(s):  
Particle Size ◽  
In Situ Polymerization ◽  
Melamine Formaldehyde ◽  
Optimum Synthesis ◽  
Particle Size Analyzer ◽  
The Mean ◽  
Oil Water ◽  
Finishing Agent ◽  
Water Ratio

Slow-released anti-mosquito microcapsules finishing agent was prepared using the resin of melamine-formaldehyde as wall and DEET as core by in-situ polymerization. The effects of emulsifier content and oil/water ratio on anti-mosquito finishing agent were investigated. Scanning electron microscopy (SEM) and laser particle size analyzer were employed to characterize the microcapsules. The optimum synthesis condition was: 3% emulsifier SMA and oil/water ratio at 4:17. Under the conditions, the mean particle size of the capsules was about 39μm.

Preparation and Characterization of MicroPCMsContaining Paraffin

2012 ◽  
Vol 430-432 ◽  
pp. 647-650
Author(s):  
Dian Wu Huang ◽  
Yuan Lian ◽  
Hong Mei Wang
Keyword(s):  
Particle Size ◽  
Thermal Properties ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Particle Size Analyzer ◽  
Good Potential

Microcapsules containing paraffin phase change materials with MMA-MAA copolymer shell were synthesised by in situ polymerization. The Structure, diameter, encapsulation ratio of paraffin and thermal properties of the prepared microcapsules were investigated by using FTIR, ELS particle size analyzer, differential scanning calorimeter (DSC), thermogravimetic analysis (TGA). This encapsulated phase change paraffin could have good potential for energy storage.

Novel Formulation Development and Evaluation of Nanoparticles Based in Situ Gelling System for The Ophthalmic Delivery of Ciprofloxacin Hydrochloride

2015 ◽  
Vol 5 (4) ◽  
Author(s):  
Kranti Singh ◽  
Surajpal Verma ◽  
Shyam Prasad ◽  
Indu Bala
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Drug Loading ◽  
In Vitro Release ◽  
Formulation Development ◽  
Ciprofloxacin Hydrochloride ◽  
Potential Value ◽  
The Mean ◽  
In Situ Gelling

Ciprofloxacin hydrochloride loaded Eudragit RS100 nanoparticles were prepared by using w/o/w emulsification (multiple emulsification) solvent evaporation followed by drying of nanoparticles at 50°C. The nanoparticles were further incorporated into the pH-triggered in situ gel forming system which was prepared using Carbopol 940 in combination with HPMC as viscosifying agent. The developed nanoparticles was evaluated for particle size, zeta potential value and loading efficiency; nanoparticle incorporated in situ gelling system was evaluated for pH, clarity, gelling strength, rheological studies, in-vitro release studies and ex-vivo precorneal permeation studies. The nanopaticle showed the mean particle size varying between 263.5nm - 325.9 nm with the mean zeta potential value of -5.91 mV to -8.13 mV and drug loading capacity varied individually between 72.50% to 98.70% w/w. The formulation was clear with no suspended particles, showed good gelling properties. The gelling was quick and remained for longer time period. The developed formulation was therapeutically efficacious, stable and non-irritant. It provided the sustained release of drug over a period of 8-10 hours.

Preparation and Characterization of Hexadecane Microcapsule Phase Change Materials by In Situ Polymerization

2013 ◽  
Vol 815 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Qiu Song ◽  
Yue Xia Li ◽  
Jing Wen Wang
Keyword(s):  
Particle Size ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Agitation Speed ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Mass Ratio

Hexadecane microcapsule phase change materials were prepared by the in-situ polymerization method using hexadecane as core materials, urea-formaldehyde resin and urea-formaldehyde resin modified with melamine as shell materials respectively. Effect of melamine on the properties of microcapsules was studied by FTIR, biomicroscopy (UBM), TGA and HPLC. The influences of system concentration, agitation speed and mass ratio of wall to core were also investigated. The results indicated that hexadecane was successfully coated by the two types of shell materials. The addition of melamine into the urea-formaldehyde resin microcapsule reduced microcapsule particle size and microencapsulation efficiency. The influences of factors such as system concentration, agitation speed and mass ratio of wall to core to different wall materials microcapsules presented different variety trends of the microcapsule particle size.

scholarly journals Synthesis and Characterization of Highly Efficient Oil-Water Separation, Recyclable, Magnetic Particles CoFe2O4/SDB

2021 ◽  
Author(s):  
Cailin Liu ◽  
Li Yu ◽  
Yue Fan ◽  
Chang Li ◽  
Xianyan Ren ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Magnetic Particles ◽  
In Situ Polymerization ◽  
Solid Phase ◽  
Sol Gel ◽  
Water Separation ◽  
Practical Applications ◽  
Oil Water Separation ◽  
Oil Water

Abstract In the oil-water separation, the difficulty to recover and low hydrophobicity are key limitation factors for practical applications. In this paper, we design Cobalt ferrite hybird Polystyrene divinylbenzene microspheres (CoFe2O4/SDB), which were conducted through in-situ suspension copolymerization. The CoFe2O4 is prepared by low heat solid phase sol-gel method. It had been found that the CoFe2O4/SDB have a spherical structure, good adsorption behavior, highly hydrophobicity and even superhydrophobicity. The adsorption capacity of CoFe2O4/SDB composites could absorb kerosene up to 6 times of its own weight. Interestingly, kerosene can be easily separated from the surface of CoFe2O4/SDB particles with ultrasonic operation. CoFe2O4/SDB particles can still maintain good hydrophobicity and adsorption capacity of kerosene after 11 cycles after drying. With in situ polymerization of St、DVB and CoFe2O4, CoFe2O4/SDB as a promising absorbent of kerosene which has great potential in application of oil-water separation.

Study on the Synthesis of Micron-Sized Magnesium Hydroxide Flame Retardant by Using a Gaseous Ammonia Bubbling Method

2013 ◽  
Vol 821-822 ◽  
pp. 1341-1345
Author(s):  
Bing Liang ◽  
Chang Jian Gao ◽  
Jiao Lv
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Experimental Design ◽  
Particle Size Distribution ◽  
Flame Retardant ◽  
Magnesium Hydroxide ◽  
Design Procedure ◽  
Gaseous Ammonia ◽  
Particle Size Analyzer ◽  
The Mean

Micron-sized Mg (OH)2 particles were synthesized by precipitation of MgSO4 with gaseous ammonia. An experimental design procedure was used to investigate the effects of the concentration of MgSO4, temperature of the reaction, time of the reaction, assembly time, speed of stirring, ultraphonic, the introduce of NaOH and surfactant on the mean particle size and the particle size distribution. Laser particle size analyzer, XRD, TG-DTG, SEM and other instrument was used to characterize the product and corresponding particle size.

Synthesis and characterization of polyaniline nanomaterials with different molar ratio of monomer

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Priyanka S ◽  
Dhachanamoorth N ◽  
Birundha B
Keyword(s):  
Particle Size ◽  
Initial Conditions ◽  
Oxidative Polymerization ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Chemical Oxidative Polymerization ◽  
Good Tool ◽  
Particle Size Analyzer ◽  
Ft Ir

Formation of polymer nanomaterials are achieved by the process of polymerization and there was an availability of different methods such as chemical oxidative polymerization,electro chemical polymerization, In-situ oxidative polymerization and emulsion polymerization etc., Many monomers combine to form polymers under certain conditions by chemical reactions between the monomers. The chemical oxidative polymerization was most commonly used method to synthesize PANI and the synthesis process involved various molar ratio of aniline (0.1M, 0.2M, 0.3M) in which APS was used as an oxidant with dopant of HCl. This study revealed that the properties changed based on their initial conditions. The prepared aromatic polyaniline was characterized by FT-IR, UV-VIS,Particle size analyzer techniques and anti-bacterial activity of the sample was analyzed.FT-IR spectroscopy gives deep view of many  functional groups that were present in a system by measuring vibrational frequencies of chemical bonds involved. UV-VIS was a good tool to identify, characterize and to study the optical properties of nanomaterials.In particle size analyzer, the size of a particle was measured using the instrument laser diffraction particle size analyzer (SALD-2300). The synthesized polyaniline had the tendency to resist the growth of both gram positive and gram negative bacteria. These organic conducting polymers were sometimes called “smart polymers” and have varies application in medical, OLED, solar cell, batteries and sensor etc.,

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