A new method for the synthesis of 4-allyloxy-1,8-naphthalimide derivatives (fluorescent brighteners) using phase transfer catalysis is reported. Four, 4-allyloxy-1,8-naphthalimide fluorescent brighteners were synthesized in good yield and their absorption and fluorescent spectra were determined....

The fluorescence resonance energy transfer between fluorescent brightener (FB, donor) and CdTe quantum dots (CdTe QDs, acceptor) was studied and a new method for detecting Hg2+ ions in water samples was accordingly developed in this paper. It was found that the effective energy transfer occurred...

Four unsaturated 1,8-naphthalimide derivatives, which are fluorescent brightening agents, were synthesised. Their properties, Cielab colour coordinates, bleaching effect on polyamide fabrics and their ability to copolymerise with styrene have been determined.

Eleven unsaturated triazinylstilbene fluorescent brightening agents were synthesized. They were capable of copolymerization with styrene and acrylonitrile, giving colourless fluorescent polymers having good stability to wet treatments and solvents. The spectral and thermal properties, brightenin...

Excitatory and emission wavelengths and quantum yields were determined for 16 fluorescent brightening agents. Optimal microscopic excitatory and barrier filters, determined by these results, were used to examine tissues stained with Phorwhite BKL and Leucophor PAF, the two agents showing the hig...

A foreground calibration technique of a pipeline analog-to-digital converter (ADC) has been presented in this paper. This work puts an emphasis on erroneous ADC output occurring due to device mismatch, which, in any standard CMOS process boils down to capacitor mismatch. Deviation of gain of a m...

An automatic real-time UAV airborne radioactivity monitoring system with high-purity germanium (HPGe) and lanthanum bromide (LaBr3) detectors (NH-UAV) was developed to precisely obtain small-scope nuclide information in major nuclear accidents. The specific minimum detectable activity concentrat...

In this paper, a new current charge-pump (CCP) based MDAC is presented. The proposed structure utilizes a new multi-level variable current source (ML-VCS) approach to improve the performance of MDAC in pipelined ADCs. The designed 1.5 bit/stage MDAC is simulated in 0.18 µm scaled CMOS technolog...

Dimethyl esters of four pyrene dicarboxylic acids were synthesized and incorporated into poly(ethylene terephthalate). The spectroscopic properties of the polymers and monomers are assessed for their effectiveness and potential as covalently-bound fluorescent brightening agents.

The study presents the photophysical and photochemical characteristics in aqueous solution of some triazine–stilbene fluorescent brighteners containing 2-hydroxyethylamino groups and their trans–cis isomers in equilibrium. It has been established that the type of substituent in the triazine ri...

Releases of municipal waters, including drinking water and wastewater, can considerably alter urban stream chemistry. However, the relative contributions of drinking water versus wastewater to streams have not been quantified previously and are therefore the focus of this study. We sampled strea...

Two novel fluorescent brightening agents (compounds 3a–b shown in Figure 1) were synthesized, using a facile three-step synthetic route, from 4,4′-diamino-2,2′-disulfonic-stilbene, cyanuric chloride, and a readily cross-linkable 3-aminopropyltrimethoxy silane. The products contain hydrolytica...

Fluorescent polypyrrole nanospheres (PPy/CBS-X) with uniform diameter were synthesized via a chemical oxidation polymerization with fluorescent brightener, 2,2′-([1,1′-biphenyl]-4,4′-diyldi-2,1-ethenediyl)bis-benzenesulfonic acid disodium salt (CBS-X), as dopant. The sample S-2 containing 1 m...

In order to improve the anti-aging property and surface strength of high-yield-paper (HYP), a novel composite fluorescent brighter (PFB/PVA/LDH) was successfully synthesized via hydrothermal reaction with 4,4′-diaminostilbene-2,2′-disulfonic acid derivative (PFB), polyvinyl alcohol (PVA) and l...

In this work, a novel polymeric fluorescent brightener based on coumarin (PFBC) was synthesized, using three-step synthetic route, from 7-amino-4-methylcoumarin, coumarin monomer (FBC), Acrylamide (AM) and methacrylatoethyl trimethyl ammonium chloride (DMC). The structure of PFBC was characteriz...

The effect of the benzotriazole type UV-absorbers Tinuvin P and Tinuvin 327 and 2.4-dihydroxy benzophenone in the dyeing of polyester fibres with Viosperse Blue RFS, an azodye of low light fastness at various depths of dyeing and UV-absorber amounts was studied using different application proced...

The decolorization of Reactive Yellow 86 (RY 86), one of reactive azo dyes, was investigated in the presence of Fenton reagent under solar light irradiation. The decolorization rate was strongly influenced by pH, initial concentrations of H2O2 and Fe(II), and so on. An initial concentration of 4...

A microscale amino-functionalized Zn(II)-MOF, namely [Zn(NH2-bdc)(4,4’-bpy)] (1) (NH2-H2bdc = 2-amino-1,4-benzenedicarboxylic acid and 4,4’-bpy = 4,4’-bipyridine), has been successfully synthesized, structurally characterized and further utilized as multi-responsive fluorescent sensor for hig...

New solid state hydrazone fluorescent reactive disperse dyes based on pyrrolinone ester and temporarily anionic sulfatoethylsulfone moiety were prepared. The NMR of all prepared dyes was studied in details; these dyes were observed only in pure hydrazone form as a mixture between E/Z isomers. Sp...

The effect of benzotriazole type UV-absorbers Tinuvin P and Tinuvin 327 and 2,4-dihydroxy benzophenone in the dyeing of polyester fabrics with C.I. Disperse Yellow 86 and C.I. Disperse Red 86 at various depths of dyeing was studied. Various amounts and two application processes of the UV-absorbe...