scholarly journals Fabrication of Enzyme-Loaded Cartridges Using CO2-Assisted Polymer Compression

Technologies ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 85
Author(s):  
Takafumi Aizawa ◽  
Shun-ichi Matsuura
Keyword(s):  
Mesoporous Silica ◽  
Azo Dye ◽  
Decomposition Reaction ◽  
Methyl Red ◽  
Reductive Decomposition ◽  
Bonding Method

An enzyme-loaded disk-shaped cartridge was fabricated using CO2-assisted polymer compression (CAPC), which is a polymer-bonding method that does not use heat. In this process, after the enzyme was loaded onto mesoporous silica, it was placed in a container fabricated from laminated fibrous sheets using CAPC. Subsequently, the lid and container were bonded via CAPC. Verification using the reductive decomposition reaction of an azo dye (methyl red) showed that the enzyme was not deactivated and that a reaction cartridge was created successfully.

Effect of Photo-Isomerization of Azo Dyes on the Photonic Bandgap in Chiral Nematics

2011 ◽  
Vol 181-182 ◽  
pp. 257-260
Author(s):  
David Statman ◽  
Andrew Jockers ◽  
Daniel Brennan
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Azo Dyes ◽  
Azo Dye ◽  
Photonic Bandgap ◽  
Methyl Red ◽  
Central Wavelength ◽  
Chiral Nematic ◽  
Anchoring Energy ◽  
Pitch Length

Chiral nematic liquid crystals prepared with Grandjean texture demonstrate a photonic bandgap whose central wavelength is proportional to the pitch length, P, of the liquid crystal and whose width is given by (ne – no)P. We show that methyl red doped chiral nematics undergo a shift in the photonic bandgap upon photo-isomerization. This shift is a result of (1) photo-induced change in anchoring energy on the nematic surface, and (2) change in the natural pitch length from the photo-isomerization of the azo dye.

scholarly journals Prospects for the use of mixed micellar structures as a template in synthesis of MCM-41-type silicas

2021 ◽  
pp. 79-89
Author(s):  
N.V. Roik ◽  
◽  
L.O. Belyakova ◽  
М.О. Dziazko
Keyword(s):  
Azo Dye ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Micelles ◽  
Hydrophobic Interactions ◽  
Sol Gel ◽  
Standard Free Energy ◽  
Reaction Medium ◽  
Total Pore Volume ◽  
Methyl Red ◽  
Sol Gel Synthesis

Formation of mixed micelles assisted by cetyltrimethylammonium bromide and methyl red was studied by means of conductometric and spectrophotometric methods. It follows from the analysis of conductometric dependences that the addition of azo dye leads to a decrease in critical micelle concentration of a long-chain quaternary ammonium salt. The respective thermodynamic parameters were calculated. The process of mixed micelles formation was stated to be spontaneous and the solubilization of azo dye by micelles of cetyltrimethylammonium bromide is profitable in terms of energy and accompanied by an increase in degrees of freedom of the system. Based on the data of spectrophotometric study of methyl red solutions in the presence of cetyltrimethylammonium bromide, the values of stability constant, partition coefficient and change in the standard free energy of methyl red distribution between aqueous and micellar medium were calculated. It was found that electrostatic and hydrophobic interactions arising between azo dye and cetyltrimethylammonium bromide molecules cause the orientation of methyl red from the shell towards the center of the micelles. It was shown that mixed micelles can be used as a template in sol-gel synthesis of mesoporous aminosilica of MSM-41 type. The results of low-temperature nitrogen adsorption-desorption and X-ray analysis revealed that the introduction of methyl red as a part of mixed micelles into the reaction medium of sol-gel synthesis causes substantial increase in specific surface area and total pore volume, noticeable reduction of pore diameter, thereby contributing to the formation of silica material with a pronounced long-range ordered mesoporous structure.

Sub-micrometric and nanometric solid phases obtained through reductive decomposition reaction of β-cyclodextrin / Β-siklodekstrin indirgeyici bozunma reaksiyonu yoluyla elde edilen alt mikrometrik ve nanometrik katı fazlar

2015 ◽  
Vol 40 (5) ◽  
Author(s):  
Kate Cristina Blanco ◽  
Francisco José dos Santos ◽  
Miguel Jafelicci Júnior ◽  
Mary Helen Palmuti Braga Vettori ◽  
Sandra Mara Martins Franchetti ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Chemical Reactions ◽  
Convenient Method ◽  
Solid Phase ◽  
Low Cost ◽  
Decomposition Reaction ◽  
Reductive Decomposition ◽  
Industrial Use ◽  
Solid Phases

AbstractObjective: Cyclodextrins have been used to catalyze chemical reactions in the synthesis of different materials. The aim of this study is to produce nanoparticles using cyclodextrin as a nanoreactor.Methods: In this study, nanoparticles from the solid phase of iron oxide (FeResults: The images demonstrated that the nanoparticles exhibited a polyhedric shape with a diameter of 100 nm for FeConclusion: Based on this characterization, the proposed technique proved to be an efficient, low-cost, convenient method for the production of sub-micrometric and nanometric solid phases and can likely be scaled up for industrial use. The results demonstrate the possibility of producing nanoparticles using cyclodextrin as a nanoreactor.

Effects of Additives on the Reductive Decomposition of Phosphogypsum in the CO Atmosphere

2013 ◽  
Vol 726-731 ◽  
pp. 331-339
Author(s):  
Long Gui Xie ◽  
Li Ping Ma ◽  
Qu Xiu Dai ◽  
Yu Mao ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Decomposition Rate ◽  
Decomposition Reaction ◽  
Decomposition Temperature ◽  
Reductive Decomposition ◽  
Reducing Atmosphere ◽  
The One

The effect of the reaction time and the amount of additives on the decomposition rate and temperature of phosphogypsum were studied in the weak reducing atmosphere of 3%Vol CO by using themixture of phosphogyp-sum and a certain percentage of CaCl2, Fe2O3and MgO additives. The resultshows that the decomposition rate of phosphogypsum reached 85% by adding CaCl2and Fe2O3, and the decomposition temperature of phosphogypsum was only 950°C which was 100 °C lower than the one of decomposition reaction of phosphogypsum without any adductives. And the addition of MgO had nosignificant effects on the decomposition of phosphogypsum under the same condition.

scholarly journals The spectral study of azo dye and cationic surfactant interaction in ethanol-water mixture

2021 ◽  
pp. 20-20
Author(s):  
Neelam Shahi ◽  
Kumar Shah ◽  
Prasad Yadav ◽  
Ajaya Bhattarai
Keyword(s):  
Cationic Surfactant ◽  
Azo Dye ◽  
Room Temperature ◽  
Water System ◽  
Solvent Polarity ◽  
Ammonium Bromide ◽  
Water Mixture ◽  
Methyl Red ◽  
Binding Parameters ◽  
Adsorption Phenomenon

The interaction of azo dye methyl red (MR) with dodecyl trimethyl ammonium bromide (DTAB) has been studied spectrophotometrically through azo-hydrazone tautomeric behavior of MR for a series of the ethanol-water system (0.1, 0.2, 0.3 and 0.4 volume fractions of ethanol) at room temperature. Critical micelle concentration was determined using the conductometric technique with increased ethanol volume influenced by solvent polarity and architectural flexibility of methyl red. The azo form of methyl red brings electrostatic interaction with cationic surfactant through the adsorption phenomenon. The binding parameters were calculated with the aid of a modified Benesi-Hildebrand equation.

Nanoremediation of Acid Red 2 with Alumina Nanoparticles and Klebsiella pneumoniae

2018 ◽  
Vol 24 (8) ◽  
pp. 5897-5900
Author(s):  
Shruti Sunil Ranade ◽  
Padma Thiagarajan
Keyword(s):  
Klebsiella Pneumoniae ◽  
Azo Dye ◽  
Bacterial Culture ◽  
Dye Degradation ◽  
Industrial Effluents ◽  
Synergistic Action ◽  
Alumina Nanoparticles ◽  
Methyl Red ◽  
Ftir Analysis

Acid red 2 is a mono azo dye that adversely affects the environment when discharged into industrial effluents. This study investigates remediation of acid red 2 using alumina nanoparticles and Klebsiella pneumoniae. Decolorization assays at 521 nm were carried out using pure 24 hour bacterial culture, with nanoparticles and bacteria-nanoparticle mixture for 4 hours. Results reveal that 20 mg of alumina nanoparticles decolorized only 23.95% of methyl red whereas 10 ml of bacterial culture combined with 20 mg of alumina nanoparticles decolorized 84.84% of acid red 2 (500 mg/L). The bacterial culture decolorized 79.98% of the dye. Immobilization of nanoparticles on bacteria and dye degradation were confirmed using SEM and FTIR analysis, respectively. Therefore, the synergistic action of alumina nanoparticles and Klebsiella pneumoniae can be exploited for nanoremediation of acid red 2.

Degradation of azo dye methyl red by Saccharomyces cerevisiae ATCC 9763

2017 ◽  
Vol 125 ◽  
pp. 62-72 ◽  
Author(s):  
Simin Vatandoostarani ◽  
Tayebe Bagheri Lotfabad ◽  
Amir Heidarinasab ◽  
Soheila Yaghmaei
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Azo Dye ◽  
Methyl Red ◽  
Degradation Of Azo Dye

Decolorization of Azo Dyes by a New Strain CD-2 Isolated from the Textile Dye Contaminated Water

2011 ◽  
Vol 183-185 ◽  
pp. 381-386 ◽  
Author(s):  
Dai Zong Cui ◽  
Min Zhao ◽  
Guo Fang Li ◽  
Xiao Xu Gu ◽  
Guang Ying Hui Du ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Removal ◽  
Contaminated Water ◽  
Textile Dye ◽  
Methyl Red ◽  
E Coli ◽  
Eriochrome Black T ◽  
Ph Range

In this study, a new strain was isolated by us based on its efficiency to decolorize azo dyes. Identification of this isolate by 16S rDNA technique revealed that the strain belonged to Escherichia, and clustered within Escherichia coli. According to this, we renamed our strain as E. coli CD-2. The strain CD-2 could decolorize azo dyes effectively under aerobic conditions. CD-2 exhibited good decolorization ability in the pH range from 3 to 11, temperature from 30°C to 42°C and salinity from 1% to 4%. CD-2 could decolorized different azo dyes (methyl red, Congo red, eriochrome black T and eriochrome red B) within 16h, and the decolorizing rate were 97.15%, 86.03%, 56.92% and 81.14%, respectively. This degradation potential increased the applicability of this strain for the azo dye removal.

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