Preparation of Sericite-TiO2 Composite Particle Material by Mechano-Chemical Method and its Application

2012 ◽  
Vol 427 ◽  
pp. 104-109 ◽  
Author(s):  
Xi Feng Hou ◽  
Shou Ren Yu ◽  
Hao Ding ◽  
Can Ye

Sericite-TiO2 composite particle material was prepared via mechano-chemical method. SEMEDS and XPS ananlysis indicates that the surface of the sericite were coated by the TiO2 layers and the Ti4+ cations were anchored by formation of SiOTi bonds. Otherwise, the TiO2-coated sericite powders have higher light scattering indexes and other more outstanding properties than the naked sericite powders. Especially, the whiteness, adsorbed value, and hiding power indexes of the rutile TiO2-coated sericite powders were higher than those of the anatase TiO2-coated sericite powders. Hence, rutile TiO2-coated sericite powders can be substitute for the titanium dioxide pigment.

2018 ◽  
Vol 25 (04) ◽  
pp. 1850085 ◽  
Author(s):  
YU LIANG ◽  
HAO DING ◽  
QIANG XUE

Brucite/TiO2 composite particle was prepared with Titanium dioxide (TiO2), coating on brucite particles’ surfaces by mechano-chemical method. X-ray diffraction (XRD), scanning electron microscope (SEM) and infrared spectra were used to investigate the microstructures, morphologies of the composite and the reaction mechanism. The results show that the ground extent of brucite as well as the mixed particles of brucite and TiO2 should keep at a suitable state. The hiding power and whiteness of the composite particles are 17.24[Formula: see text]g/m2 and 96.88%, respectively, presenting its similarity to TiO2 in pigment properties. TiO2 coats evenly on the surfaces of brucite through surface dehydroxylation reaction during mechano-chemical method.


Author(s):  
John R. D. Hervey ◽  
Paolo Bombelli ◽  
David J. Lea-Smith ◽  
Alan K. Hulme ◽  
Nathan R. Hulme ◽  
...  

AbstractAbsorption spectroscopy is widely used to determine absorption and transmission spectra of chromophores in solution, in addition to suspensions of particles, including micro-organisms. Light scattering, caused by photons deflected from part or all of the cells or other particles in suspension, results in distortions to the absorption spectra, lost information and poor resolution. A spectrophotometer with an integrating sphere may be used to alleviate this problem. However, these instruments are not universally available in biology laboratories, for reasons such as cost. Here, we describe a novel, rapid, and inexpensive technique that minimises the effect of light scattering when performing whole-cell spectroscopy. This method involves using a custom made dual compartment cuvette containing titanium dioxide in one chamber as a scattering agent. Measurements were conducted of a range of different photosynthetic micro-organisms of varying cell size and morphology, including cyanobacteria, eukaryotic microalgae and a purple non-sulphur bacterium. A concentration of 1 mg ml−1 titanium dioxide, using a spectrophotometer with a slit width of 5 nm, produced spectra for cyanobacteria and microalgae similar (1–4% difference) to those obtained using an integrating sphere. The spectrum > 520 nm was similar to that with an integrating sphere with the purple non-sulphur bacterium. This system produced superior results to those obtained using a recently reported method, the application of the diffusing agent, Scotch™ Magic tape, to the side of the cuvette. The protocol can be completed in an equivalent period of time to standard whole-cell absorbance spectroscopy techniques, and is, in principle, suitable for any dual-beam spectrophotometer.


Nature ◽  
1959 ◽  
Vol 184 (4679) ◽  
pp. 49-50 ◽  
Author(s):  
JAMES E. LATTY ◽  
W. C. CLARK

2019 ◽  
Vol 40 (3) ◽  
pp. 298-303
Author(s):  
吕依颖 LYU Yi-ying ◽  
高 珊 GAO Shan ◽  
徐庆君 XU Qing-jun

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