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d-Glucose recognition based on phenylboronic acid-functionalized polyoligomeric silsesquioxane fluorescent probe
摘要： We report a new strategy to synthesize hybrid fluorescent nanosensors consisting of phenylboronic acid-functionalized POSS (POSS–PBA) and diol-modified 8-anilino-1-naphthalenesulfonic acid (ANSA (a fluorescent dye)) for the detection of the biologically important D-glucose. The probe was characterized by FT-IR and 1H-NMR analyses, and the photoluminescence intensity was measured under various conditions to confirm its glucose sensing ability. Our POSS-APBA-dye probe could detect glucose at concentrations of 0–20 mg/mL, with a good linear relationship even at low glucose concentrations of 0–1 mg/mL. The properties of the POSS-APBA-dye probe were evaluated and compared with those of an APBA-dye probe. The glucose sensing ability of our POSS-APBA-dye probe was largely unaffected by the presence of interfering substances. The probe showed high sensing ability in a pH 5 environment and long-term (approximately 40 days) fluorescence stability.
关键词： polyhedral oligomeric silsesquioxane,glucose sensor,fluorescence probe,boronic acid derivative
更新于2025-09-23 15:21:01
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An optical sensor for discriminating the chemical compositions and sizes of plastic particles in water based on water-soluble networks consisting of polyhedral oligomeric silsesquioxane presenting dual-color luminescence
摘要： Luminescent water-soluble networks containing the coumarin luminophore were prepared by using polyhedral oligomeric silsesquioxane (POSS) as a cross-linking point, and the optical properties of these networks in the presence and absence of various particles in water were monitored. From the emission measurements, we found that water dispersions of the POSS networks showed bimodal light-emission bands, namely in the blue and yellow regions. In particular, enhancement of the emission band in the blue region was observed upon the introduction of polystyrene particles (PSPs), poly(lactic acid) particles (PLAPs) and poly(methyl methacrylate) particles (PMMAPs), followed by changes in the color of the luminescence of the samples. In contrast, hardly any significant changes were observed when silica particles (SPs) were added. Moreover, plastic particles with diameters of less than 1 mm drastically affected the optical properties of the networks. Thus according to these results, the presence of plastic particles with sub-micron dimensions in water could be detected by changes in the color of light emitted from the POSS network from yellow to blue. Note that silica species, such as sand or rock particles, can be ignored in this system. From mechanistic studies, it was revealed that the blue-light-emission band was enhanced when the networks were adsorbed onto the surfaces of the particles. These characteristics are applicable for constructing a facile fluorescence sensor for detecting water pollution, especially nanosized plastics, denoted here as nanoplastics.
关键词： optical sensor,plastic particles,polyhedral oligomeric silsesquioxane,water-soluble networks,dual-color luminescence
更新于2025-09-16 10:30:52
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[IEEE 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Budapest (2018.7.1-2018.7.5)] 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Influence of Polyhedral Oligomeric Silsesquioxane (POSS) on Space Charge Behavior and Trap Levels of XLPE/POSS nanocomposite
摘要： Polyhedral Oligomeric Silsesquioxane (POSS), a nanometric hybrid molecule, is being paid great attention in the field of polymeric micro and nanodielectrics. In this work, study of spacecharge behavior and trap levels of virgin XLPE and XLPE/OibPOSS (OctalsoButyl Polyhedral Oligomeric SilSesquioxanes) nanocomposites is presented. Two techniques namely Pulse Electro Acoustic (PEA) and Thermal Stimulated Current (TSC) are adopted to illustrate the behavior of space charge and trap levels. Melt blending technique using twin-screw extruder is chosen to make XLPE/POSS nanocomposites in 1wt% and 3wt% concentration of Octaisobutyl POSS(OibPOSS). A low temperature extrusion profile with temperatures (120?-180?) and rotation speed of 100 rpm was maintained in order to achieve XLPE/OibPOSS nanocomposites. TSC data along with the total charge decay data is used to calculate the trap levels inside the composite samples. The results showed similar trap values calculated from both the techniques. It is observed that the POSS has changed the XLPE chain mobility and depth of the charge trapping sites. Mostly, shallow traps are observed in 1wt% and 3wt% samples with charges having a high recombination rate. The charge decay rate is faster in 1wt% and 3wt% samples as compared with virgin XLPE. It is concluded that the interfacial contact formed between different concentrations of POSS and XLPE, and also polymer structure, both are important parameters for industry to consider during manufacturing in order to mitigate the accumulation of traps and spacecharges.
关键词： Polyhedral oligomeric silsesquioxane,cross linked polyethylene,spacecharge,melt blending,thermally stimulated current
更新于2025-09-09 09:28:46