Rhodamine Derivative- Based Cellulose Acetate Electrospun Colorimetric Sensor for Cu2+ Sensing in Water: Effects of Alkaline Treatment

2019 ◽  
Vol 20 (3) ◽  
pp. 481-489 ◽  
Author(s):  
Nilobol Tungsombatvisit ◽  
Thitirat Inprasit ◽  
Dini Rohmawati ◽  
Penwisa Pisitsak
Keyword(s):  
Cellulose Acetate ◽  
Alkaline Treatment ◽  
Colorimetric Sensor ◽  
Rhodamine Derivative ◽  
Water Effects

Br-PADAP embedded in cellulose acetate electrospun nanofibers: Colorimetric sensor strips for visual uranyl recognition

2017 ◽  
Vol 329 ◽  
pp. 205-210 ◽  
Author(s):  
Lin Hu ◽  
Xue-Wu Yan ◽  
Qi Li ◽  
Xue-Ji Zhang ◽  
Dan Shan
Keyword(s):  
Cellulose Acetate ◽  
Electrospun Nanofibers ◽  
Colorimetric Sensor

Preparation and Characterization of Cellulose Acetate from Pineapple (Ananas comosus) Leaves

2018 ◽  
Vol 772 ◽  
pp. 8-12
Author(s):  
Marycris P. Egot ◽  
Arnold C. Alguno
Keyword(s):  
Thermal Stability ◽  
Cellulose Acetate ◽  
Ester Group ◽  
Alkaline Treatment ◽  
Ananas Comosus ◽  
Hydroxyl Group ◽  
Sodium Chlorite ◽  
Gravimetric Analysis ◽  
Sem Images ◽  
Acetyl Group

Pineapple leaves was utilized for the fabrication of cellulose acetate. It underwent a series of process that includes alkaline treatment using sodium hydroxide aqueous solution, bleaching treatment using acetate buffer and aqueous sodium chlorite, and acetylation using acetic anhydride. The preparation of cellulose acetate was done in different acetylation times (8, 16, 24 and 32 hours). The cellulose acetate samples were then characterized using fourier transform infrared spectroscopy (FTIR) to elucidate the vibrational move, thermal gravimetric analysis (TGA) and differential thermal analysis (DTA) to investigate the thermal property of the material and scanning electron microscopy (SEM) to examine the surface morphology. FTIR result showed significant decrease in absorption intensity of the O-H stretch after the acetylation which indicates the substitution of hydroxyl group by acetyl group. On the other hand, the emergence of C=O stretch of the ester group and C-O stretch of acetyl group can be observed which indicates the formation of cellulose acetate. TGA and DTA also shows enhanced thermal stability of cellulose acetate prepared in 16 hrs acetylation period. Increasing the reaction time to 24 hrs and 32 hrs resulted to significant decrease in thermal stability. SEM images revealed the deterioration on the physical structure of cellulose after 24 hrs acetylation.

Colorful Nanofibers for Advanced Apparel Application

2018 ◽  
Vol 916 ◽  
pp. 10-13 ◽  
Author(s):  
Farooq Ahmed ◽  
Umair Ahmed Qureshi ◽  
Zeeshan Khatri
Keyword(s):  
Cellulose Acetate ◽  
Smooth Surface ◽  
Cellulose Nanofibers ◽  
Alkaline Treatment ◽  
Color Fastness ◽  
Treatment Results ◽  
Color Yield

We report herein, the synthesis of colorful nanofibers by electrospinning and dyeing with various class of dyestuff. Results revealed that dyes impart better color yield with the acceptable colorimetric values, color yield and color fastness. Morphology of nanofibers showed smooth surface of the dyed nanofibers under SEM. Cellulose nanofibers in particular, were prepared using precursor cellulose acetate and then converted into cellulose under alkaline treatment. Results revealed that dyes impart better color yield with the adequate color yield (KS) and color fastness. Morphology of nanofibers showed smooth nanofibers after dyeing under SEM. Based results obtained, the colorful nanofiber can be a better choice for advance apparel applications.

Influence of alkaline treatment on sisal fibre applied as reinforcement agent in composites of corn starch and cellulose acetate matrices

2020 ◽  
pp. 1-9
Author(s):  
Roberta Ranielle Matos de Freitas ◽  
Karina Palmizani do Carmo ◽  
Jéssica de Souza Rodrigues ◽  
Vitor Hugo de Lima ◽  
Joelen Osmari da Silva ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Corn Starch ◽  
Alkaline Treatment ◽  
Sisal Fibre

Cellulose Acetate Reverse Osmosis Membrane Structure

1972 ◽  
Vol 30 ◽  
pp. 528-529
Author(s):  
H. K. Plummer ◽  
E. Eichen ◽  
C. D. Melvin
Keyword(s):  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Membrane Structure ◽  
Freeze Drying ◽  
Dense Layer ◽  
Water Removal ◽  
Reverse Osmosis Membrane ◽  
Correct Interpretation ◽  
Electron Image ◽  
Scanning Electron

Much of the work reported in the literature on cellulose acetate reverse osmosis membranes has raised new and important questions with regard to the dense or “active” layer of these membranes. Several thickness values and structures have been attributed to the dense layer. To ensure the correct interpretation of the cellulose acetate structure thirteen different preparative techniques have been used in this investigation. These thirteen methods included various combinations of water substitution, freeze drying, freeze sectioning, fracturing, embedding, and microtomy techniques with both transmission and scanning electron microscope observations.It was observed that several factors can cause a distortion of the structure during sample preparation. The most obvious problem of water removal can cause swelling, shrinking, and folds. Improper removal of embedding materials, when used, can cause a loss of electron image contrast and, or structure which could hinder interpretation.

Effect of Alkaline Treatment on Bacteriochlorophyll a, Quinones and Energy Transfer in Chlorosomes from Chlorobium tepidum and Chlorobium phaeobacteroides

1999 ◽  
Vol 69 (3) ◽  
pp. 322 ◽  
Author(s):  
Cornelis A. van Walree ◽  
Yumiko Sakuragi ◽  
Dorte B. Steensgaard ◽  
Carola S. Bösinger ◽  
Niels-Ulrik Frigaard ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Alkaline Treatment ◽  
Bacteriochlorophyll A ◽  
Chlorobium Tepidum ◽  
Chlorobium Phaeobacteroides
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