Tuning the Sensitivity and Dynamic Range of Optical Oxygen Sensing Films by Blending Various Polymer Matrices

In this work, eight different types of optical oxygen sensing films were prepared by impregnating indicator and matrix solution on the surface of a polypropylene microporous filter membrane. The polymer matrix of the sensing films was ethyl cellulose (EC), polymethyl methacrylate (PMMA), and their blends with different mixing ratios. Scanning electron microscopy (SEM), laser confocal microscopy, and fluorescence spectrometer were used to investigate the morphologies and optical properties of the sensing films. Phase delay measurements under different oxygen partial pressures (PO2) and temperatures were applied to investigate the analytical performances of the sensing film for gaseous O2 monitoring. Results show that the response time of all the sensing films was extremely fast. The sensitivities and dynamic ranges of the sensing films with the blended polymer matrix were separately decreased and increased as the EC/PMMA ratio decreased, and the S-V curve of the sensing films blended with equal content of EC and PMMA exhibited good linearity under different temperatures, showing a promising prospect in practical application.

Highly Sensitive Organic Phototransistors Fabricated from PCPDTBT:PCBM Blend

Organic phototransistors (OPTs) play a crucial role in various light sensing and imaging applications. In this work, we have fabricated highly sensitive Poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b’]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blended thin film based OPTs using ribbon-floating film transfer method. A high charge carrier mobility (μ) of 0.002 cm2V−1s−1 and an Ion/Ioff of 6 × 104 was showcased by the blended polymer thin film based OPT as compared to its pristine polymer thin film based counterpart which had a μ of 0.001 cm2V− 1s−1 and an Ion/Ioff of 9 × 103. Further, the blended polymer thin film based OPT demonstrated a high photosensitivity of 6.6 × 103 and a photoresponsivity of 0.13 A/W towards white light which were much superior than those of many of the previously reported polymer thin film based OPTs. The results hold crucial significance towards the development of cost effective blended polymer thin film based OPTs.

EFFECTS OF LASER IRRADIATION ON ADHESIVE TRIBO-PERFORMANCE OF EVA/HDPE/MA-G-PE/OMMT BLENDED POLYMER NANOCOMPOSITES

Ethylene-co-vinyl acetate (EVA), high density polyethylene (HDPE) and their blends are being used in many engineering applications. In this work, an attempt was made to extend the conventional uses of EVA/HDPE blended polymer nanocomposites by laser treating their surface to automobile, aircraft, and similar industries, where tribological properties played an important role. Effects of laser irradiation on adhesive tribo-performances of maleic anhydride grafted polyethylene (MA-g-PE: 2phr) modified ethylene-co-vinyl acetate/high density polyethylene (EVA/HDPE: 70/30 wt. %) organ modified montmorillonite (OMMT: 4phr) blended polymer nanocomposite have been investigated. EVA/HDPE/MA-g-PE/OMMT polymer nanocomposite was irradiated by Ytterbium laser system (YSL-2000) at various scan speeds and power densities. As per ASTM G99 standard, tribo-performance attributes coefficient of friction and specific wear rate were evaluated using pin-on-disc machine against rotating EN31 steel disc of 60 HRC at different loads and speeds. Wear mechanisms of worn surfaces were analyzed using scanning electron microscopy (SEM) images. It was observed that coefficient of friction and specific wear rate were significantly affected by power density and load, while sliding distance and scan speed have marginal effects.

An Experimental Investigation on High Strength Binary Blended Polymer Hybrid Concrete using polycarboxylate Super Plasticizer

Concrete the arena’s most consumed material after water on the earth planet. Concrete is the cloth that's stated to be sturdy in compression and susceptible within the tension. Steel is the ductile fabric to resist anxiety in the concrete. Cement is the non-acidic and alkaline which save you the metal from corrosion. The most important attention on this experimental take a look at inside the beyond is made to make concrete strong in tension with less use of metal and with using a few replacements. The Steel crimped fibres are said for use to enhance the homes of concrete that have the improvement to the age factor of concrete. The use of Polypropylene fibres to enhance the flexural assets inside the concrete. Past Experimental research with the aid of part of the past researchers. The use of polycarboxylate amazing plasticizers to enhancethe workability and to lessen the water percentage material with in the concrete along with improve the compressive electricity with the emphases at the specific properties of concrete to triumph over the special botheration in concrete. Concrete has been serious trouble manifest in now every day so we want to find out the arrangement of this difficulty. In this undertaking to be middle around attributes best of solid evaluation of cement with various corresponding of supplanting of concrete with and we along with pleated metallic fibre. To utilising metal fibre, improve the flexural pleasant of cement in diverse range mixture. The solid of blend to be casted with metallic fibre and without metal fibre in vary costs 0.8% 1.8% 2.8% and 3.8%. To trust the cost of improvement to be examines. The 3-d squares and chamber have been tried for both split malleable (150 mm width and 300 mm period chambers) and compressive excellent 3-D shape. At final, the high-quality presentation of blended fibre concrete is contrasted and the exhibition of commonplace cement