scholarly journals Carboxylic Acid‐Functionalized Conjugated Polymer Promoting Diminished Electronic Drift and Amplified Proton Sensitivity of Remote Gates Compared to Nonpolar Surfaces in Aqueous Media

2020 ◽  
Vol 6 (7) ◽  
pp. 1901073
Author(s):  
Hyun‐June Jang ◽  
Justine Wagner ◽  
Yunjia Song ◽  
Taein Lee ◽  
Howard E. Katz
Keyword(s):  
Carboxylic Acid ◽  
Conjugated Polymer ◽  
Aqueous Media

Conjugated Polymer Nanoparticles in Aqueous Media by Assembly with Phospholipids via Dense Alkyl Chain Packing

2017 ◽  
Vol 50 (17) ◽  
pp. 6935-6944 ◽  
Author(s):  
Yeol Kyo Choi ◽  
Dabin Lee ◽  
Sang Yup Lee ◽  
Tae Joo Shin ◽  
Juhyun Park ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Alkyl Chain ◽  
Aqueous Media ◽  
Polymer Nanoparticles ◽  
Chain Packing ◽  
Conjugated Polymer Nanoparticles

scholarly journals Red-Emitting Hybrid Based on Eu3+-dbm Complex Anchored on Silica Nanoparticles Surface by Carboxylic Acid for Biomarker Application

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5494
Author(s):  
João A. O. Santos ◽  
Alessandra M. G. Mutti ◽  
Airton G. Bispo-Jr ◽  
Ana M. Pires ◽  
Sergio A. M. Lima
Keyword(s):  
Carboxylic Acid ◽  
Aqueous Suspension ◽  
Aqueous Media ◽  
Particle Morphology ◽  
Hybrid Structure ◽  
Hierarchical Organization ◽  
Stable Suspension ◽  
Carboxylate Groups ◽  
Red Luminescence ◽  
Average Size

Luminescent organic-inorganic hybrids containing lanthanides (Ln3+) have been prominent for applications such as luminescent bio-probes in biological assays. In this sense, a luminescent hybrid based on dense silica (SiO2) nanospheres decorated with Eu3+ β–diketonate complexes using dibenzoylmethane (Hdbm) as a luminescent antenna was developed by using a hierarchical organization in four steps: (i) anchoring of 3-aminopropyltriethoxysilane (APTES) organosilane on the SiO2 surface, (ii) formation of a carboxylic acid ligand, (iii) coordination of Eu3+ to the carboxylate groups and (iv) coordination of dbm− to Eu3+. The hybrid structure was elucidated through the correlation of thermogravimetry, silicon nuclear magnetic resonance and photoluminescence. Results indicate that the carboxylic acid-Eu3+-dbm hybrid was formed on the surface of the particles with no detectable changes on their size or shape after all the four steps (average size of 32 ± 7 nm). A surface charge of −27.8 mV was achieved for the hybrid, assuring a stable suspension in aqueous media. The Eu3+ complex provides intense red luminescence, characteristic of Eu3+5D0→7FJ electronic transitions, with an intrinsic emission quantum yield of 38%, even in an aqueous suspension. Therefore, the correlation of luminescence, structure, particle morphology and fluorescence microscopy images make the hybrid promising for application in bioimaging.

Conjugated Polymer Microspheres for “Turn-Off”/“Turn-On” Fluorescence Optosensing of Inorganic Ions in Aqueous Media

2011 ◽  
Vol 83 (7) ◽  
pp. 2712-2718 ◽  
Author(s):  
Adrián Álvarez-Diaz ◽  
Alfonso Salinas-Castillo ◽  
María Camprubí-Robles ◽  
José M. Costa-Fernández ◽  
Rosario Pereiro ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Aqueous Media ◽  
Inorganic Ions ◽  
Polymer Microspheres ◽  
Turn On

Synthesis of a new fluorescent conjugated polymer microsphere for chemical sensing in aqueous media

2010 ◽  
Vol 46 (8) ◽  
pp. 1263 ◽  
Author(s):  
A. Salinas-Castillo ◽  
M. Camprubí-Robles ◽  
R. Mallavia
Keyword(s):  
Conjugated Polymer ◽  
Chemical Sensing ◽  
Aqueous Media ◽  
Polymer Microsphere

Self-assembled conjugated polymer/carboxymethyl chitosan grafted poly(p-dioxanone) nanomicelles and their use in functionalized indicator paper for fast and visual detection of a banned food dye

2014 ◽  
Vol 5 (14) ◽  
pp. 4251-4258 ◽  
Author(s):  
Hui Chen ◽  
Meiwan Chen ◽  
Xiaohui Wang ◽  
Runcang Sun
Keyword(s):  
Conjugated Polymer ◽  
Visual Detection ◽  
Aqueous Media ◽  
Carboxymethyl Chitosan ◽  
Fluorescent Nanoparticles ◽  
Selective Detection ◽  
Food Dye ◽  
Self Assembled ◽  
Polysaccharide Derivative

Fluorescent nanoparticles composed of a self-assembled polysaccharide derivative and a conjugated polymer show greatly improved sensitivity for the selective detection of a banned food dye in aqueous media.

scholarly journals Titrimetric assay of lisinopril in aqueous and non-aqueous media

2018 ◽  
Vol 35 (2) ◽  
pp. 07
Author(s):  
K. Basavaiah ◽  
K. Tharpa ◽  
K. B. Vinay
Keyword(s):  
Carboxylic Acid ◽  
Aqueous Media ◽  
Reference Method ◽  
Standard Addition ◽  
Acid Group ◽  
Molar Ratio ◽  
Acetic Acid Medium ◽  
Molar Ratios ◽  
B Method ◽  
Student’S T

Four simple titrimetric procedures are described for the determination of lisinopril (LNP) in bulk and in pharmaceuticals based on the neutralization of basic-amino and acidic carboxylic acid groups present in LNP. Method A is based on the neutralization of basic amino groups using perchloric acid as titrant in anhydrous acetic acid medium. Method B, method C and method D are based on neutralization of carboxylic acid group using NaOH, sodium methoxide and methanolic KOH, as titrants, respectively. Method A is applicable over 2.0-20.0 mg range and the calculations are based in the molar ratio of 1:2 (LNP:HClO4). Method B, method C and method D are applicable over 2.0-20.0 mg, 1.0-10.0 mg and 5.0-15.0 mg range,  respectively, and their respective molar ratios are 1:1 (LNP:NaOH), 1:2 (LNP:CH3ONa) and 1:1 (LNP:KOH). Intraday and inter day accuracy and precision of the methods were evaluated and the results showed intra- and inter-day precision less than 2.7% (RSD), and accuracy of < 2.5% (RE). The developed methods were applied to determine LNP in tablets and the results were validated statistically by comparing the results with those of the reference method by applying the Student’s t-test and F-test. The accuracy was further ascertained by recovery studies via standard addition technique. No interferences from common tablet exipients was observed.

scholarly journals Fluorescence and photostability studies of anthracene-9-carboxylic acid in different media

2000 ◽  
Vol 2 (1) ◽  
pp. 47-53 ◽  
Author(s):  
M. S. A. Abdel-Mottaleb ◽  
H. R. Galal ◽  
A. F. M. Dessouky ◽  
M. El-Naggar ◽  
D. Mekkawi ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Aqueous Media ◽  
Chemical Species ◽  
Ammonium Bromide ◽  
Solvent Mixtures ◽  
Photochemical Degradation ◽  
Acid Base ◽  
Photodegradation Rate ◽  
Acid Base Equilibrium ◽  
Cetyltrimethyl Ammonium

Electronic absorption and fluorescence spectra of anthracene-9-carboxylic acid (ANCA) were studied in different homogeneous solvents, binary protic/aprotic solvent mixtures and in heterogeneous solutions of the cationic cetyltrimethyl ammonium bromide (CTAB) micelle. Different chemical species of ANCA were identified spectroscopically in different media. The results are discussed on the basis of a mechanism that involves two equilibria: acid-base equilibrium and monomer-dimer equilibrium. These equilibria were found to be very sensitive to the nature of the medium and the concentration of ANCA.Moreover, while it is photostable in most solvents studied, the ANCA was found to be photolabile in aqueous media of different pHs. The acid-base catalyzed photodegradation rate was studied by following up absorption and/or fluorescence intensities as a function of illumination dose. The determined rate of the photochemical degradation of ANCA depends on the nature of the medium. The first order degradation rate constant is remarkably enhanced in heterogeneous medium of CTAB. As expected, the determined activation energy is low (∼3.2 kJ.mol-1). This result favors photooxidation process. Anthraquinone was the main photodegradation product obtainedvia9,9′-dicarboxylic head-to-head dimer of anthracene that was identified by GC-Mass technique.

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