Topic
Blue colored
About: Blue colored is a research topic. Over the lifetime, 599 publications have been published within this topic receiving 6635 citations.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: In this paper, the photocycloreversion reactions in the single-crystalline phase were observed in a closed-ring isomer of 1,2-Bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene.
Abstract: 1,2-Bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a) and their derivatives, 1,2-bis(2-methyl-5-p-tolyl-3-thienyl)perfluorocyclopentene (2a) and 1,2-bis(2-methyl-5-p-tert-butylphenyl-3-thienyl)perfluorocyclopentene (3a), were found to undergo reversible photochromic reactions in the single-crystalline phase. Upon irradiation with 366 nm light the single crystals turned blue. The blue colored crystals returned to colorless by irradiation with visible light (λ > 480 nm). The substituents at para positions of the phenyl groups did not affect the rates of photocyclization reactions both in the single-crystalline phase and in hexane. Activation energies of the photocyclization reactions were almost zero. On the other hand, activation energies as much as 5−10 kJ mol-1 were observed in the photocycloreversion reactions in the single-crystalline phase. These values were smaller than those observed in solution, ca. 16 kJ mol-1. Slow thermal cycloreversion reaction of the closed-ring isomer (1b) was observ...
496 citations
TL;DR: A baseline outlook for microplastics contamination in dairy products is developed and a great deal is posed to take necessary controls and preventive measures to avoid them.
350 citations
TL;DR: In this article, an enzyme mimetic of horse radish peroxidase (HRP) was used for detecting free cholesterol in graphite using GQDs, which is a simple and quick one-step wet chemical method.
Abstract: In the present study, we report graphene quantum dots (GQDs), an enzyme mimetic of horse radish peroxidase (HRP), for unprecedented detection of free cholesterol. Synthesized directly from graphite using simple and quick one step wet chemical method, these GQDs in the presence of H 2 O 2 exhibit highly efficient catalytic activity toward the oxidation of peroxidase substrate 3,3,5,5-tetramethylbenzidine (TMB) to produce a blue colored product. The proposed detection system based on GQDs allows wide range (0.02–0.6 mM) of cholesterol sensing with a detection limit as low as 0.006 mM. Further, higher V max (7.3 × 10 −6 M s −1 ) along with lower K m (0.01 mM) attest enhanced peroxidase like catalytic activity and better binding affinity of cholesterol oxidase (ChOx) to cholesterol resulting in good biosensor stability and resistance to environmental interferences. The proposed method without the use of sophisticated instruments perceives the cholesterol using naked eye with blue color compound formation. The potential of the method to be applied on field is shown by the proposed cholesterol measuring color wheel, where the shades of color are related to actual levels of cholesterol in the sample.
176 citations
TL;DR: The present colorimetric aptasensor is the first attempt to use the peroxidase-like activity of nanomaterial for OTA detection, which may provide an acttractive path toward routine quality control of food safety.
161 citations
TL;DR: In this paper, high-resolution transmission electron microscopy (TEM) images showed highly crystalline particles in the 4 to 9 nm size regime, and X-ray powder diffraction patterns of the nanocrystals indicate the same rutile lattice structure as known from bulk SnO2.
Abstract: Nanocrystallites of antimony-doped tin dioxide have been prepared hydrothermally by treating colloids of tin antimony oxide in an autoclave. At a synthesis temperature of 270 °C stable colloidal solutions of blue-colored SnO2:Sb nanocrystallites have been obtained. High resolution transmission electron microscopy (TEM) images show highly crystalline particles in the 4 to 9 nm size regime. X-ray powder diffraction patterns of the nanocrystals indicate the same rutile lattice structure as known from bulk SnO2. Powders of the antimony-doped nanocrystals exhibit an up to 105 fold increase in electrical conductivity as compared to the corresponding undoped systems. The blue color of the doped colloids corresponds to a broad absorption peak in the red and the IR region. The IR-absorption spectrum of doped nanoparticles deposited onto sapphire substrates has been fit to a model based on the Drude theory of a free electron gas in SnO2:Sb and an effective medium approximation. The model indicates that the IR absor...
145 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 10 |
| 2020 | 26 |
| 2019 | 20 |
| 2018 | 25 |
| 2017 | 19 |
| 2016 | 24 |