Academia.eduAcademia.edu

Figure 7 – uploaded by Nizam El-Ashgar

See full PDFdownloadDownload figure
Figure 7. Absorption change of the hand at 553 nm versus the concentrations of entrapped phenolphthalein. REFERENCES is a linear relation between the absorbance and the concentration of the entrapped phenolphthalein. This suggests that the phenolphthalein molecules have diffused homogeneously into the pores of the network of the silica.

Figure 7 Absorption change of the hand at 553 nm versus the concentrations of entrapped phenolphthalein. REFERENCES is a linear relation between the absorbance and the concentration of the entrapped phenolphthalein. This suggests that the phenolphthalein molecules have diffused homogeneously into the pores of the network of the silica.

Related Figures (7)

fable 1. Entrapment Capacity of Phenolphthalein by Monolithic Polysiloxane Versus Concentration
fable 1. Entrapment Capacity of Phenolphthalein by Monolithic Polysiloxane Versus Concentration
Figure 1. Entrapment of phenolphthalein in polysiloxane monolith as a function of the amount of phenolphthalein initially added to the sol monomeric mixture. The electronic spectra for the free silica and _ the immobilized phenolphthalein were obtained in the Figure 4 describes the change of the absorbance of the band at 553nm of the immobilized phenolphthalein when treated with base (0.1 M NaOH) at different time
Figure 1. Entrapment of phenolphthalein in polysiloxane monolith as a function of the amount of phenolphthalein initially added to the sol monomeric mixture. The electronic spectra for the free silica and _ the immobilized phenolphthalein were obtained in the Figure 4 describes the change of the absorbance of the band at 553nm of the immobilized phenolphthalein when treated with base (0.1 M NaOH) at different time
Figure 2. UV/Vis spectra of: A) immobilized phenolphthalein; B) immobilized phenolphthalein treated with aqueous 0.10 M NaOH solution; C) immobilized phenolphthalein (in b) treated with aqueous 0.10M HCl solution; D) free phenolphthalein solution in H,O/MeOH solvent mixture.
Figure 2. UV/Vis spectra of: A) immobilized phenolphthalein; B) immobilized phenolphthalein treated with aqueous 0.10 M NaOH solution; C) immobilized phenolphthalein (in b) treated with aqueous 0.10M HCl solution; D) free phenolphthalein solution in H,O/MeOH solvent mixture.
Phenolphthalein pH-Indicator Figure 3. Absorption change of the band at 553 nm versus time, for the immobilized phenolphthalein of different concentrations upon treatment with: (A) 0.10M sodium hydroxide solution; (B) 0.1 M HCl solution for the previous basically treated material.
Phenolphthalein pH-Indicator Figure 3. Absorption change of the band at 553 nm versus time, for the immobilized phenolphthalein of different concentrations upon treatment with: (A) 0.10M sodium hydroxide solution; (B) 0.1 M HCl solution for the previous basically treated material.
Figure 4. Electronic spectra of phenolphthalein (0.005 M) entrapped into silica matrix upon treatment with 0.10 M NaOH solution at different time intervals: 1—zero time (untreated sample), 2—after 1 minute, 3—after 2 minutes, 4—after 6 minutes, 5—after 9 minutes, 6—after 24 minutes, 7—after 45 minutes, 8—after 100 minutes, 9—after 120 minutes.
Figure 4. Electronic spectra of phenolphthalein (0.005 M) entrapped into silica matrix upon treatment with 0.10 M NaOH solution at different time intervals: 1—zero time (untreated sample), 2—after 1 minute, 3—after 2 minutes, 4—after 6 minutes, 5—after 9 minutes, 6—after 24 minutes, 7—after 45 minutes, 8—after 100 minutes, 9—after 120 minutes.
Figure 5. FT-IR spectra of: (A) free silica treated; (B) immobilized phenolphthalein.
Figure 5. FT-IR spectra of: (A) free silica treated; (B) immobilized phenolphthalein.
Figure 6. Cross-polarized microscope photographs: (A) free silica treated; (B) immobilized phenolphthalein, 0.0005 M; (C) immobilized phenolphthalein, 0.005 M. right © N
Figure 6. Cross-polarized microscope photographs: (A) free silica treated; (B) immobilized phenolphthalein, 0.0005 M; (C) immobilized phenolphthalein, 0.005 M. right © N
Related topics:
Materials Science
580 California St., Suite 400
San Francisco, CA, 94104
© 2025 Academia. All rights reserved