Presenting the Chemical Paper.

1964 ◽  
Vol 4 (3) ◽  
pp. 131-140
Author(s):  
B. A. Jones
Keyword(s):  
Chemical Paper

Writing the Chemical Paper.

1964 ◽  
Vol 4 (3) ◽  
pp. 126-130
Author(s):  
John C. Lane
Keyword(s):  
Chemical Paper

scholarly journals Nanosericite as an Innovative Microparticle in Dual-Chemical Paper Retention Systems

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Yuan-Shing Perng ◽  
Eugene I-Chen Wang ◽  
Chih-Kai Chang ◽  
Chih-Ping Chang
Keyword(s):  
Optical Properties ◽  
Cost Effectiveness ◽  
Physical Properties ◽  
Colloidal Silica ◽  
Optimal Performance ◽  
Anionic Polymer ◽  
Chemical Paper ◽  
Chemical Retention ◽  
Polymer Microparticles

Dual-chemical retention systems based on 2 cationic polyacrylamides, a colloidal silica, and a globular anionic polymer microparticles were investigated and an exfoliated nanoparticle indigenous mica mineral, sericite, was examined for its efficacy in substituting commercial microparticle preparations. The results indicated that nanosericite generated FPR between 76.9 and 80.9% for fines and chemicals. Its ash retention values, however, were higher and tended to increase with doses of polymer, nanosericite, or Sc to between 16 and 24%. As for paper physical properties, nanosericite was not amenable to substitute the c-PAMb/polymer with only handsheet stiffness superior to the combination. Nanosericite, however, showed good substitution capacity than the c-PAMa-colloidal silica combination. Regardless of the c-PAMa doses, all examined handsheet physical properties incorporating nanosericite were superior to colloidal silica. The optimal performance was observed with c-PAMa dose of 200 ppm. Optical properties of the handsheets indicated that with nanosericite substitution, brightness values were comparable to the polymer group, while its substitution capacity for colloidal silica decreased with increasing c-PAMb dose. Only at c-PAMa dose of 300 ppm, it appeared to have good substitution for colloidal silica. Substituting nanosericite for colloidal silica appeared to reduce the c-PAMa charge and increased the overall cost effectiveness.

scholarly journals A Paper-Based Ultrasensitive Optical Sensor for the Selective Detection of H2S Vapors

Chemosensors ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 40
Author(s):  
Alejandro P. Vargas ◽  
Francisco Gámez ◽  
Javier Roales ◽  
Tânia Lopes-Costa ◽  
José M. Pedrosa
Keyword(s):  
Color Change ◽  
Limit Of Detection ◽  
Chemical Paper ◽  
Straightforward Method ◽  
Specific Performance ◽  
Standard Lead ◽  
Specific Reactions ◽  
Kinetics Of ◽  
Very High

A selective and inexpensive chemical paper-based sensor for the detection of gaseous H2S is presented. The triggering of the sensing mechanism is based on an arene-derivative dye which undergoes specific reactions in the presence of H2S, allowing for colorimetric analysis. The dye is embedded into a porous cellulose matrix. We passively exposed the paper strips to H2S generated in situ, while the absorbance was monitored via an optic fiber connected to a spectrophotometer. The kinetics of the emerging absorbance at 534 nm constitute the sensor response and maintain a very stable calibration signal in both concentration and time dimensions for quantitative applications. The time and concentration dependence of the calibration function allows the extraction of unusual analytical information that expands the potential comparability with other sensors in the literature, as the limit of detection admissible within a given exposure time. The use of this specific reaction ensures a very high selectivity against saturated vapors of primary interferents and typical volatile compounds, including alkanethiols. The specific performance of the proposed sensor was explicitly compared with other colorimetric alternatives, including standard lead acetate strips. Additionally, the use of a smartphone camera to follow the color change in the sensing reaction was also tested. With this straightforward method, also affordable for miniature photodiode devices, a limit of detection below the ppm scale was reached in both colorimetric approaches.

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