Elucidating the Origin of the Toxicity of Nano-CeO2 to Chlorella pyrenoidosa：the Role of Specific Surface Area and Chemical Composition

2021 ◽  
Author(s):  
Changjian Xie ◽  
Yuhui Ma ◽  
Peng Zhang ◽  
Junzhe Zhang ◽  
Xiaowei Li ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Aquatic Environment ◽  
Cerium Dioxide ◽  
Environmental Application ◽  
Ecotoxicological Effects

With the increasing environmental application and discharge of nano cerium dioxide (nano-CeO2), it is urgent to fully understand its ecotoxicological effects on the aquatic environment. This study for the first...

Comparative Analysis on Chemical Composition and Charcoal Characterization of Two Miscanthus Species

2011 ◽  
Vol 415-417 ◽  
pp. 1265-1272
Author(s):  
Wen Biao Zhang ◽  
Wen Zhu Li ◽  
Bing Song Zheng
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Water Content ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ph Value ◽  
Perennial Grass ◽  
Water Extract ◽  
Carbonization Temperature ◽  
Hot Water

Miscanthus is a highly productive, rhizomatous, C4 perennial grass that should be considered as an excellent active carbon precursor. This paper compares the charcoal characterization and chemical composition between M. sinensis and M. floridulus. Species differed in water content, hot water extract, 1% NaOH extract, organic solvent extract, cellulose, lignin and ash. Carbonization temperatures have effects on charcoal yields of Miscanthus, which ranged from 23.5% to 48.0% for M. sinensis and 11.3% to 37.2% for M. floridulus. Water content, charcoal density, pH value, and specific surface area of charcoal characterization varied between two species of Miscanthus. The specific surface area increased with the increase of carbonization temperature. The highest specific surface area of M. sinensis and M. floridulus was 351.74 m2g−1and 352.74 m2g−1, respectively, when the carbonization temperature was 800°C.

Study on Comparison among Papermaking Powder Properties

2012 ◽  
Vol 512-515 ◽  
pp. 2434-2438
Author(s):  
Quan Xiao Liu ◽  
Wen Cai Xu
Keyword(s):  
Particle Size ◽  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Preparation Method ◽  
Powder Properties

In this paper the comparison among some papermaking powder properties are studied. It shows that the properties of different powders are different because of different chemical composition and different preparation method and their particle size is different for different purpose such as filler and pigment. The particle size of powder for pigment powder is smaller than that for filler. The specific surface area of papermaking filler is lower than 20m2/g, the absorption value of DBP is about 45cm3/100g, the whiteness is up to 90%, and the particle size is about 3µm. The specific surface area of papermaking pigment is lower than 25m2/g, the absorption value of DBP is from 40 cm3/100g to100cm3/100g, the whiteness of clay is up to 50%, the whiteness of GCC and PCC is up to 90%, and the particle size is lower than 2µm. The specific surface area of silica is up to 100m2/g, the absorption value of DBP is up to 100cm3/100g, the whiteness is up to 97%, and the particle size is around 5µm.

scholarly journals Chemical Composition but Not Specific Surface Area Affects Calcium Retention of Nanostructured Calcium Compounds in Growing Rats

2017 ◽  
pp. jn241927
Author(s):  
Lidija Posavec ◽  
Florentine M Hilty ◽  
Jeannine Baumgartner ◽  
Hylton Buntting ◽  
Monika Hilbe ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Calcium Retention ◽  
Growing Rats ◽  
Calcium Compounds

scholarly journals A role of free silanol groups of nanosilica surface in interaction with poly(vinyl pyrrolidone)

2018 ◽  
Vol 72 (2) ◽  
pp. 51 ◽  
Author(s):  
Olga Voronina ◽  
Maria Malysheva ◽  
Liudmyla Nosach ◽  
Eugeny Voronin ◽  
Vladimir Gun’ko ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Crucial Role ◽  
Vinyl Pyrrolidone ◽  
Initial Amount ◽  
Silanol Groups ◽  
Adsorption Monolayer ◽  
Poly Vinyl Pyrrolidone

In this work, a role of the number of free silanol groups at a nanosilica surface (specific surface area S<sub>BET</sub> = 250 m<sup>2</sup>/g, initial amount of silanols α<sub>ОН</sub> = 0.60-0.62 mmol/g) was analyzed in interaction with poly(vinyl pyrrolidone) (PVP) vs. the degree (Q<sub>TMS</sub>) of silica hydrophobization by hexamethyldisilazane at 100 <sup>o</sup>C. The value of Q<sub>TMS</sub> was 0.07, 0.42, 0.67, 0.81, 0.82, and 1.0. Adsorption of PVP onto a nanosilica surface was carried out from a water and water-ethanol (1:1) solutions of the polymer. It was shown that free silanol groups play a crucial role in the adsorption of poly(vinyl pyrrolidone). The value of the maximal adsorption (monolayer capacity) on completely hydrophobic nanosilica surface is approximately by 6.5 times lower than that for unmodified nanosilica

Synthesis and Characterization of Cerium Dioxide Nanoparticles Obtained by a Novel Soft Mechanochemical Method Combined with Sol–Gel Method

NANO ◽  
2017 ◽  
Vol 12 (02) ◽  
pp. 1750020
Author(s):  
Chuan Zhou ◽  
Dachuan Zhu ◽  
Daji Wang
Keyword(s):  
Particle Size ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Cerium Dioxide ◽  
Sol Gel ◽  
Fluorite Structure ◽  
Mechanochemical Reaction ◽  
Transmission Electron ◽  
Crystallite Sizes

After mechanochemical reaction of hydrous cerium (III) chloride and citric acid with a little of ethanol followed by a subsequent calcination process at different temperature, cerium dioxide nanoparticles with fluorite structure were successfully prepared. Then the obtained ceria powders were characterized by means of X-ray diffractometer, specific surface area analyzer, scanning electron microscope, transmission electron microscopy and laser particle analyzer. It was found that the degree of particle aggregation passed through a minimum with the calcination temperature rising from 400[Formula: see text]C to 800[Formula: see text]C, accompanied with growth of particle size. The ceria powders calcined at 500[Formula: see text]C had an average aggregated particle size of 59.8[Formula: see text]nm with uniform spheroidal morphology, while their crystallite sizes ranged from 10[Formula: see text]nm to 20[Formula: see text]nm. Yet the product calcined at 400[Formula: see text]C had the maximum specific surface area of 109.6[Formula: see text]m2/g. In polishing experiment, the ceria powders calcined at 500[Formula: see text]C showed great polishing performances.

scholarly journals The specific surface area and chemical composition of diamond dust near Barrow, Alaska

2011 ◽  
Vol 116 ◽  
Author(s):  
Florent Domine ◽  
Jean-Charles Gallet ◽  
Manuel Barret ◽  
Stéphan Houdier ◽  
Didier Voisin ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area
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