1,100 research outputs found
sj-TIF-1-tej-10.1177_20417314211073934 – Supplemental material for Precision-engineered niche for directed differentiation of MSCs to lineage-restricted mineralized tissues
No full textSupplemental material, sj-TIF-1-tej-10.1177_20417314211073934 for Precision-engineered niche for directed differentiation of MSCs to lineage-restricted mineralized tissues by Saeed Ur Rahman, Sasikumar Ponnusamy, Malvika Nagrath and Praveen R Arany in Journal of Tissue Engineering</p
Spray coated textile solar cells
No full textE-textiles are a promising platform for wearable technologies, but these face the ubiquitous challenge of supplying power. One approach is to harvest ambient solar energy. Here we present a novel fully solution processed fabrication method and achieved on both organic solar cells (OSCs) and solid state dye sensitised solar cells (ssDSSCs), which were deposited directly on the surface of a standard woven textiles. A polyester cotton textile was used for the OSCs and a glass fibre textile substrate was used for the ssDSSCs that contain multiple layers of electrodes and active materials. All PV textile devices were characterized under simulated AM 1.5 conditions and a peak efficiency of 1.23% for OSCs and 0.4% for DSSCs was achieved. The fabrication approach demonstrates the feasibility of fabricating OSCs on any standard textile and ssDSSCs onto glass fibre textiles.</p
Solution processed organic solar cells on textiles
No full textE-textiles are a promising platform for wearable technologies; but it faces the ubiquitous challenge of supplying power. One approach is to harvest ambient solar energy. Here, we present a fully solution processed organic solar cell (OSC) fabricated directly on to the surface of a standard polyester cotton fabric. A flexible screen printed interface layer is used to selectively smooth the fabric surface on to which all subsequent layers were deposited. The active layers making up the OSC were deposited entirely by solution processing using either spray coating or doctor blading in a nitrogen environment. Process temperatures are limited to 150 &#x00B0;C to protect the fabric. Spray coating is found to be a repeatable and reliable way to deposit thin functional films onto the fabric and we have obtained a maximum efficiency of 1.23&#x0025; demonstrating the feasibility of this approach for fabricating OSCs on any standard textile.</p
Synthesis, Structure and Reactivity of Hydrated and Dehydrated Organotin Cations
No full textMonomeric organotin dications {[nBu2Sn(H2O)4]2+·2C6H5SO3-} and {[nBu2Sn(H2O)4]2+·1,5-C10H6(SO3-)2} have been synthesized by the reaction of [nBu2SnO]n and the corresponding arylsulfonic acid. Dodecanuclear organooxotin macrocations {[(nBuSn)12(μ 3-O)14(μ 2-OH)6]2+·2RSO3-} (R = C6H5; 2,5-Me2C6H3) have been synthesized by the reaction of nBuSn(O)(OH) and the corresponding arylsulfonic acid. The X-ray crystal structure of one of the dodecanuclear cages is reported. These organotin cations have been shown to be effective catalysts in acetylation and transacetylation reactions
Processing of printed dye sensitized solar cells on woven textiles
No full textThis paper presents the novel use of screen printing and spray coating techniques to fabricate dye sensitized solar cells on textiles for wearable energy harvesting applications. Multiple functional layers of electrodes and active materials have been deposited on everyday use polyester cotton woven fabric and high-temperature resistant glass fiber fabric. The poly cotton fabric limits processing temperatures to 150 °C, while the glass fiber textile can withstand up to 1200 °C. The surface roughness of the textiles has been significantly reduced by screen printing a polyurethane interface layer on the polyester cotton fabric and a liquid polyimide on the glass fiber textile. A silver bottom electrode layer and a bespoke titanium dioxide electron transport layer formulated for each temperature range were then screen printed onto the planarized surfaces. The devices use Iodine/Iodide (I3-/I-) as the liquid electrolyte and were sealed with a plastic PET/ITO, which also forms the counter electrodes. The printed cells have demonstrated photovoltaic (PV) power conversion efficiencies of 3.24% on polyester cotton and 4.04% on glass fiber textiles, in ambient conditions. The polyurethane and polyimide interface layers significantly enhance the performance and stability of the fabricated cells providing extended operational lifetimes. This approach is potentially suitable for the low-cost integration of PV devices into clothing and other textile applications.</p
Sasikumar Ponnalagu. (2019). பாரம்பரிய விளையாட்டுகள், பாடல்கள் வழியே தமிழ்மொழிக் கற்பித்தல் [Teaching Tamil language through traditional games and songs]
No full textOur traditional games and game-based songs have cultural values. As such, we would like to teach our students these traditional games and game-based songs for better understanding of our values and integrating them into their daily lives. Our traditional songs have an array of benefits which include the teaching of correct pronunciation. When these songs are practiced aloud, the students will be able to recognize and pronounce Tamil alphabets in the proper manner. In the past, people lived as jointfamilies. However, in our current modern world, most of them are living with their separate families. As such, they do not have sufficient knowledge and exposure with regards to the proper kinship terms. Most of the traditional Tamil game-based songs include Tamil kinship terms, Tamil names of flowers, names of the 12 Tamil Months, and names of the 60 Tamil years. All these, can be taught easily through our Tamil game-based songs. By singing the songs, students can build on their vocabulary. Self directed learning is one important aspect amongst the 21st CC skills. These songs equip our students skills necessary to meet the challenges of the globalized world today as well as enhancing their psychological learning. While playing these traditional games, students tend to learn more from their peers as compared to their parents and teachers. Many Tamil students face problems in reading Tamil fluently. Practicing our game based songs will help to recognize, speak and read Tamil without much difficulties, making them more fluent in reading. Most of the songs have values and deep meanings,
which boost the morale of students allowing them to have a greater sense of esteem. In all, we would like to reiterate that teaching and learning through Tamil game-based songs is enjoyable, enriching and fulfilling.</p
AAN882870 Research Data - Supplemental material for Adult tetralogy repair: factors affecting early outcome in the current era
No full textSupplemental material, AAN882870 Research Data for Adult tetralogy repair: factors affecting early outcome in the current era by Sowmya Ramanan, Navaneetha Sasikumar, Krishna Manohar, Salla Sweta Ramani, RaghavanNair Suresh Kumar , Ravi Agarwal, Raghavan Subramanyam and Kotturathu Mammen Cherian in Asian Cardiovascular and Thoracic Annals</p
Supplemental Material - A study on development of silicone rubber with conductive carbon, polyaniline, MWCNT composite for EMI shielding
No full textSupplemental Material for A study on development of silicone rubber with conductive carbon, polyaniline, MWCNT composite for EMI shielding by J Jayakanth, K Chennakesavulu, G Ramanjaneya Reddy, S Dhanalakshmi, V Priya, K Sasikumar and T Sasipraba in High Performance Polymers</p
Energy-harvesting materials for smart fabrics and textiles
No full textThis article reviews materials developed to enable energy harvesting from textiles. It includes energy harvesting from mechanical, thermal, and light sources, and covers materials employed into yarns that can be woven into the textile and films that are deposited onto the surface of the textile. The textile places challenging constraints on the materials, for example, by limiting processing temperatures to typically less than 150°C and presenting a rough, inconsistent surface profile. Example materials include a screen-printable low-temperature composite lead zirconate titanate polymer film and poly(vinylidene fluoride) polymer fibers, both of which have been shown to harvest mechanical energy from textiles. Thermoelectric solutions demonstrated thus far are limited and challenging to implement within a textile. Photovoltaic solutions include organic and dye-sensitized solar cells fabricated into functionalized yarns and as films spray-coated onto textiles. While numerous suitable example materials and textile devices have been demonstrated, work is still needed to develop these into practical energy-harvesting solutions.</p
Printable piezoresistive carbon formulation for stretch and flex sensors in e-textile applications
No full textIn this paper, we present a carbon-based formulation that is suitable for stencil printing on textiles to fabricate stretch and flex sensors for the detection of human joint movement. This novel carbon-based formulation demonstrates (1) highly stretchable and high change in resistance, which can be used as the stretch and flex sensor for strain measurement; (2) good wettability, which enables it to be combined with other printable functional pastes used in printed electronics. This paper will show the material used in the formulation and the piezoresistive pattern printed onto textiles. The performance of the stretch and flex sensor will also be demonstrated, which is designed to be used in body sensing networks for sensing the joint movement.</p
- …
