scholarly journals Rapid, Wide-Range, and Low-Cost Determination of Formaldehyde Based on Porous Silica Gel Plate by Digital Image Colorimetry

Proceedings ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 13
Author(s):  
Simin Cao ◽  
Yangyi Liu ◽  
Litao Zhao ◽  
Xiaodan Cao ◽  
Xueli Wang ◽  
...  
Keyword(s):  
Silica Gel ◽  
Digital Image ◽  
Low Cost ◽  
Porous Silica ◽  
Good Precision ◽  
Formaldehyde Concentration ◽  
Wide Range ◽  
Blue Component ◽  
Porous Silica Gel ◽  
Cost Determination

A porous silica gel plate impregnated with a colorimetric reagent, 4-amino-3-penten-2-one (Fluoral-P) has been fabricated for the first time to determinate formaldehyde. The reaction of formaldehyde and Fluoral-P produced a yellow product 3,5-diacetyl-1,4-dihydrolutidine (DDL), which was further photographed by a smartphone. A good linear relationship has been found between the intensity of blue component from the digital image and formaldehyde concentration in the range of 0–50 mg L−1 with low detection limit of 2.2 ± 0.1 mg L−1. A good precision in the range of 0.59–7.75%RSD and an accuracy with the relative error of +3.7% from control samples are also obtained. These results demonstrate that our developed low-cost sensor, together with digital image colorimetry, has potential for sensitively and quickly measuring formaldehyde.

Diffusion of gases in porous silica gel

1995 ◽  
Vol 190 (3) ◽  
pp. 206-211 ◽  
Author(s):  
S. Satoh ◽  
I. Matsuyama ◽  
K. Susa
Keyword(s):  
Silica Gel ◽  
Porous Silica ◽  
Porous Silica Gel ◽  
Diffusion Of Gases

Photosynthesis within porous silica gel: viability and activity of encapsulated cyanobacteria

2008 ◽  
Vol 18 (24) ◽  
pp. 2833 ◽  
Author(s):  
Joanna Claire Rooke ◽  
Alexandre Léonard ◽  
Hugo Sarmento ◽  
Jean-Pierre Descy ◽  
Bao-Lian Su
Keyword(s):  
Silica Gel ◽  
Porous Silica ◽  
Porous Silica Gel

NOTE ON THE DIELECTRIC CONSTANTS OF ETHYL CHLORIDE AND n-BUTANE ADSORBED ON NONPOROUS TiO2

1953 ◽  
Vol 31 (11) ◽  
pp. 998-1003 ◽  
Author(s):  
M. H. Waldman ◽  
J. A. Snelgrove ◽  
R. Mcintosh
Keyword(s):  
Temperature Dependence ◽  
Silica Gel ◽  
Porous Silica ◽  
Adsorbed Molecule ◽  
Dielectric Constants ◽  
Ethyl Chloride ◽  
Capacity Change ◽  
Adsorbed Phase ◽  
Porous Silica Gel ◽  
Linear Sections

The dielectric constants of ethyl chloride and n-butane adsorbed on nonporous TiO2 were measured. The plot of capacity change versus volume adsorbed was found to reveal two linear sections in the case of ethyl chloride with an abrupt change in the slope of the plot occurring at the Vm value calculated using the B.E.T. or Hüttig adsorption equations. With n-butane the plot was linear beyond Vm. For ethyl chloride on rutile a slight temperature dependence in the polarization was observed for the volume of gas adsorbed above Vm, while a negligible temperature dependence was noted for the portion below Vm. It is postulated that the observations with the polar gas on the nonporous rutile can be explained by a change from oscillatory to rotational motion of the adsorbed molecule after the monolayer is complete. It was noted that gases adsorbed on nonporous TiO2 behaved differently from gases adsorbed on porous silica gel. This appears to lead to the necessity of postulating changes of density for the adsorbed phase on silica gel.

scholarly journals Blood-group-Ii-active gangliosides of human erythrocyte membranes

1978 ◽  
Vol 173 (1) ◽  
pp. 245-254 ◽  
Author(s):  
T Feizi ◽  
R A Childs ◽  
S I Hakomori ◽  
M E Powell
Keyword(s):  
Blood Group ◽  
Silica Gel ◽  
Human Erythrocyte ◽  
Porous Silica ◽  
Erythrocyte Membranes ◽  
Group I ◽  
Internal Structures ◽  
Human Erythrocyte Membranes ◽  
Porous Silica Gel ◽  
Group Ii

More than ten new types of gangliosides, in addition to haematoside and sialosylparagloboside, were isolated from human erythrocyte membranes. These were separated by successive chromatographies on DEAE-Sephadex, on porous silica-gel columns and on thin-layer silica gel as acetylated compounds. Highly potent blood-group-Ii and moderate blood-group-H activities were demonstrated in some of the ganglioside fractions. The gangliosides incorporated into cholesterol/phosphatidylcholine liposomes stoicheiometrically inhibited binding of anti-(blood-group I and i) antibodies to a radioiodinated blood-group-Ii-active glycoprotein. The fraction with the highest blood-group-I-activity, I(g) fraction, behaved like sialosyl-deca- to -dodeca-glycosylceramides on t.l.c. Certain blood-group-I and most of the -i determinants were in partially or completely cryptic form and could be unmasked by sialidase treatment. Thus the I and i antigens, which are known to occur on internal structures of blood-group-ABH-active glycoproteins in secretions, also occur in the interior of the carbohydrate chains of erythrocyte gangliosides.

Superfluidity of4He Confined within Porous Silica Gel

1987 ◽  
Vol 26 (S3-1) ◽  
pp. 275 ◽  
Author(s):  
K. I. Blum ◽  
S. Murphy ◽  
M. H. W. Chan ◽  
D. D. Awschalom ◽  
J. D. Reppy
Keyword(s):  
Silica Gel ◽  
Porous Silica ◽  
Porous Silica Gel
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