Characterization of particle size and its distribution during the crystallization of organic fine chemical products as measured in situ using ultrasonic attenuation spectroscopy

2001 ◽  
Vol 109 (1) ◽  
pp. 274-282 ◽  
Author(s):  
Patricia Mougin ◽  
Derek Wilkinson ◽  
Kevin J. Roberts ◽  
Richard Tweedie
Keyword(s):  
Particle Size ◽  
Ultrasonic Attenuation ◽  
Fine Chemical ◽  
Chemical Products

In Situ Synthesis and Characterization of Nanosize Hydroxyapatite/Polyacrylonitrile Composite Bead

2013 ◽  
Vol 743-744 ◽  
pp. 486-490
Author(s):  
Ming Mei Xu ◽  
Wang Xiao ◽  
Yong Zhu Cui ◽  
Wei Shao ◽  
Yan Ling Sui ◽  
...  
Keyword(s):  
Particle Size ◽  
Synthesis Method ◽  
Sem Analysis ◽  
Physical Interaction ◽  
X Ray Diffraction ◽  
Composite Bead ◽  
Composite Beads ◽  
High Conversion Ratio

nanosize hydroxyapatite/polyacrylonitrile composite bead was prepared via in-situ synthesis method. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), particle size measurement and X-ray diffraction (XRD) were used to characterize the HAp/PAN composite bead. XRD curve indicates low crystallinity of HAp. Particle size and SEM analysis demonstrates that decreased partical size of synthesized HAp as well as good distribution with the addition of PAN is found. The HAp is well-distributed and the combination between HAp and PAN is well. FTIR showed that there was no shift of characteristic peaks of synthesized HAp in PAN, which proves the physical interaction between PAN and HAp. The approximate HAp content of 28.6% calculated from thermal analysis curves means high conversion ratio of HAp. The adsorption amount of cadmium ions onto composite beads is lower than HAp particles.

PENGARUH PENAMBAHAN NANOZEOLIT ALAM DALAM PREPARASI NANOKOMPOSIT FOAM POLIURETAN TERHADAP SIFAT MEKANIK

2019 ◽  
Vol 27 (3) ◽  
pp. 1179
Author(s):  
Fransiskus Gultom ◽  
Hernawaty Hernawaty
Keyword(s):  
Particle Size ◽  
Elastic Modulus ◽  
Polyurethane Foam ◽  
Toluene Diisocyanate ◽  
Polypropylene Glycol ◽  
Particle Size Analyzer ◽  
Nanocomposite Foam ◽  
Percentage Ratio

The processing and characterization of polyurethane nanocomposite foam by adding Sarulla natural nanozeolit filler have been researched. The stages in the research of the processing of polyurethane nanocomposite foam were: 1) the preparation and purification of natural zeolit, 2) the processing of nanozeolit, 3) the processing of polyurethane nanocomposite foam using in situ process by mixing natural nanozeolit into the mix of polypropylene glycol and toluene diisocyanate.  The result of the analysis of particle size analyzer showed that the Sarulla nanozeolit particle size was 95,8 nm. The variation of percentage ratio of nanozeolit as filler to polypropylene glycol and toluene diisocyanate was (0, 5, 10, 15, 20 and 25)%. The result of tensil test by using ASTM D 638 V standard showed that polyurethane foam with 20% wt filler would increase the elastic modulus to 36% (219,9 MPa).

Characterization of nanophase titania particles synthesized using in situ steric stabilization

1997 ◽  
Vol 12 (7) ◽  
pp. 1755-1765 ◽  
Author(s):  
A. G. Gaynor ◽  
R. J. Gonzalez ◽  
R. M. Davis ◽  
R. Zallen
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Phase Transformation ◽  
High Water ◽  
Molar Ratio ◽  
Transformation Behavior ◽  
X Ray ◽  
Infrared Techniques

Ultrafine titania particles were synthesized from titanium tetraethoxide (TEOT) dissolved in ethanol. The concentration of water and of the soluble polymer hydroxypropylcellulose (HPC) were varied to control particle size. The HPC adsorbed onto the titania particles during growth, providing a steric barrier to aggregation. Electron microscopy showed that particles smaller than 70 nm were formed at high water concentrations (R > 120 where R is the molar ratio [H2O]/[TEOT]) and in the presence of HPC. The annealing-induced, phase-transformation behavior of these particles (amorphous → anatase → rutile) from 100 to 1000 °C was characterized by x-ray, Raman, and infrared techniques. The conversion of anatase to rutile occurred more readily for particles made at high water concentrations and with HPC. For particles formed by premixing TEOT with HPC prior to hydrolysis at R = 155, an 800 °C anneal yielded a rutile fraction exceeding 95%; particles made at R = 5.5 with no HPC showed negligible conversion at this temperature.

Characterization of solid and metal element distributions in urban highway stormwater

1997 ◽  
Vol 36 (8-9) ◽  
pp. 155-160 ◽  
Author(s):  
John J. Sansalone ◽  
Steven G. Buchberger
Keyword(s):  
Particle Size ◽  
Treatment Strategies ◽  
Runoff Water ◽  
Element Analysis ◽  
Rainfall Events ◽  
Gravel Size ◽  
Metal Element ◽  
Mass Increase

Urban drainage from paved surfaces transports a wide gradation of solids ranging from sub-micron particles to gravel size aggregates. This study measured physical characteristics of solids transported in lateral pavement sheet flow from a heavily traveled urban roadway in Cincinnati. The physical characteristic measured was particle size which was used as a surrogate of specific surface area. Solids were sorted according to particle size distributions (PSD). Solids ranged from smaller than 1 μm to greater than 10,000 μm. Particles larger than 25 μm were separated mechanically to generate PSDs. Flow rate and duration controlled the yield and size of transported solids. Metal element analysis of PSD from snow and rainfall events indicate that Zn, Cu and Pb mass increase with decreasing particle size. Cd did not exhibit a similar trend. Results provide guidance for assessment of urban runoff water quality impacts and design of in-situ treatment strategies.

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.

Sign in / Sign up

Export Citation Format

Share Document