Paper supercapacitor could power future paper electronics

first_img More information: Liangbing Hu, Hui Wu, and Yi Cui. “Printed energy storage devices by integration of electrodes and separators into single sheets of paper.” Applied Physics Letters 96, 183502 (2010). Doi:10.1063/1.3425767 Copyright 2010 All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of In the paper supercapacitor, all the necessary components are integrated onto a single sheet of paper in the form of single walled carbon nanotubes (SWNTs). High-speed printing could be used to print the SWNTs directly onto a piece of paper – anything from Xerox paper to newspaper and even grocery ads will work. At first, the researchers found that the SWNTs were so small that they penetrated the paper through micron-sized pores, which would cause the device to short-circuit. To solve this problem, the researchers first coated both sides of the paper with polyvinylidene fluoride (PVDF), which blocked the pores but still allowed for electrolytes to be transported through the paper. As such, the treated paper could function as an electrolyte membrane and separator without short-circuiting. “The key design is that SWNTs stick well on paper and do not penetrate through paper completely to avoid shorting,” Yi Cui of Stanford University told the SWNTs were printed onto the treated paper, they experienced strong bonding forces similar to those experienced when writing with a pen or pencil on paper. Even when rubbed or subjected to tape, the SWNTs remained attached to the paper. After printing SWNTs on both sides of single sheets of paper, electrolyte was loaded to form a supercapacitor. The SWNTs served as both the electrodes and current collectors in the supercapacitor, which had a capacitance of about 3 F/g. The device also showed an excellent cycling stability, with very little loss of capacitance after 2500 cycles. The researchers say the same concept could be extended to make batteries, as well.The fully integrated supercapacitor is based on an earlier version that the researchers made, in which nanomaterials were coated separately onto different anode and cathode substrates and then assembled together with a separator. The advantage of the new integrated structure is that it allows for high-speed printing, which greatly reduces fabrication costs and brings disposable, flexible, and lightweight paper electronics closer to reality. Cui said that, in the future, the researchers plan “to use this new design for real applications.” Citation: Paper supercapacitor could power future paper electronics (2010, May 21) retrieved 18 August 2019 from Photos at left and center show the paper supercapacitor printed on Xerox paper. The right photo shows the paper supercapacitor printed on newspaper. Image credit: Liangbing Hu, et al. ©2010 AIP. ( — All those paper transistors and paper displays that scientists have been designing can now be powered by an onboard power source, thanks to the development of a new paper supercapacitor. Designed by researchers at Stanford University, the paper supercapacitor is made by simply printing carbon nanotubes onto a treated piece of paper. The researchers hope that the integrated design could lead to the development of low-cost, disposable paper electronics. Explore further At Stanford, nanotubes + ink + paper = equal instant battery (w/ Video) This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Flexible LEDs for implanting under the skin

first_img( — Researchers in the US, China, Korea and Singapore have collaborated to develop flexible ultra-thin sheets of inorganic light emitting diodes (LEDs) and photodetectors for implantation under the skin for medical monitoring, activating photo-sensitive drugs, and other biomedical applications. Potential biomedical applications for the LEDs include implantable patches for monitoring wound healing, for use in diagnosis or spectroscopy, or to control the delivery of drugs triggered by light in photodynamic drug therapy. They could also be used in light-emitting sutures or implantable illuminated plasmonic crystals, and may find application in robotics.Rogers has recently founded a company in Cambridge, Massachusetts, mc10, to work on commercializing the new technology, which is a goal he regards as “incredibly appealing.” Rogers said he wanted the technology to have an impact, and that was the end goal serving as the motivation for the work. Explore further Optical image of an 8×8μ-ILEDs array on a thin PDMS substrate in its on state under deformed conditions. Image credit: Nature Materials, doi:10.1038/nmat2879 This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. More information: Rak-Hwan Kim, et al., Waterproof AlInGaP optoelectronics on stretchable substrates with applications in biomedicine and robotics, Nature Materials, Advance online publication (2010) doi:10.1038/nmat2879 Ultrathin light-emitting diodes create new classes of lighting and display systems The research, led by John Rogers of the University of Illinois at Urbana-Champaign in the US, and published today in Nature Materials developed flexible arrays 2.5 μm thick and 100 x 100 μm square, which is much smaller than any commercially available array. They printed circuits directly onto a rigid glass substrate and then transferred them to an inexpensive biocompatible polymer called poly(dimethylsiloxane) (PDMS) to create a mesh-like array of LEDs and photodetectors.The PDMS substrate is flexible enough that the circuits can still function even if twisted or stretched by even as much as 75 percent. Rogers said most research has concentrated on organic LEDs (OLEDs), which are extremely sensitive to water and oxygen, but the flexible arrays are encapsulated in a thin layer of silicon rubber, which makes them waterproof and allows them to function well when implanted or completely immersed in biofluids. The design also eliminates the mechanical constraints normally imposed on such devices by the inflexible semiconductor wafers that support them.The researchers successfully tested the LEDs by integrating a sheet into the fingertip of a vinyl glove, which they then immersed in soapy water, and they have also implanted an array beneath the skin in an animal model. Schematic illustration of the encapsulation of an implantable array of μ-ILEDs. Image credit: Nature Materials, doi:10.1038/nmat2879 Citation: Flexible LEDs for implanting under the skin (2010, October 18) retrieved 18 August 2019 from © 2010 PhysOrg.comlast_img read more

Spider is the second most vibrationsensitive creature

first_img Citation: Spider is the second most vibration-sensitive creature (2011, October 28) retrieved 18 August 2019 from ( — A new study in Austria has confirmed that spiders are extremely sensitive to vibrations, and determined they are the second most vibration-sensitive organism, topped only by cockroaches. Explore further © 2011 More information: Force transformation in spider strain sensors: white light interferometry, J. R. Soc. Interface, Published online before print October 26, 2011, doi: 10.1098/​rsif.2011.0565AbstractScanning white light interferometry and micro-force measurements were applied to analyse stimulus transformation in strain sensors in the spider exoskeleton. Two compound or ‘lyriform’ organs consisting of arrays of closely neighbouring, roughly parallel sensory slits of different lengths were examined. Forces applied to the exoskeleton entail strains in the cuticle, which compress and thereby stimulate the individual slits of the lyriform organs. (i) For the proprioreceptive lyriform organ HS-8 close to the distal joint of the tibia, the compression of the slits at the sensory threshold was as small as 1.4 nm and hardly more than 30 nm, depending on the slit in the array. The corresponding stimulus forces were as small as 0.01 mN. The linearity of the loading curve seems reasonable considering the sensor’s relatively narrow biological intensity range of operation. The slits’ mechanical sensitivity (slit compression/force) ranged from 106 down to 13 nm mN−1, and gradually decreased with decreasing slit length. (ii) Remarkably, in the vibration-sensitive lyriform organ HS-10 on the metatarsus, the loading curve was exponential. The organ is thus adapted to the detection of a wide range of vibration amplitudes, as they are found under natural conditions. The mechanical sensitivities of the two slits examined in this organ in detail differed roughly threefold (522 and 195 nm mN−1) in the biologically most relevant range, again reflecting stimulus range fractionation among the slits composing the array. Cupiennius salei. Image: Kuhn-Nentwig, JBC, American Society for Biochemistry and Molecular Biology This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Assassin bugs trap spiders by mimicking prey (w/ Video) Spiders of all kinds have long been known to be sensitive to vibratory stimulation, since vibrations on their webs or on foliage alert them to the presence of prey. If the vibrations are within a defined frequency and amplitude range, spiders attack the vibration source. Vibrations with characteristics outside these biologically meaningful ranges do not induce an attack response.The new research, led by Clemens F. Schaber of the University of Vienna’s Department of Neurobiology, used scanning white light interferometry and micro-force measurements for the first time to quantify the forces on spider strain sensors that detect vibrations, to try to determine just how sensitive they were. The spider they chose was the adult female Cupiennius salei, the Central American wandering spider, which they had bred in their laboratory, and which they chose for its large size and its hunting style of detecting vibrations in the foliage as their prey moves around nearby. The wandering spider derives its name from its habit of wandering about at night on the trees on which it lives, rather than building a web and waiting for prey to become entrapped. Females can reach a leg span of 10 centimeters, with a body length of up to 3.5 centimeters.Team member Friedrich G. Barth explained that the spider has over 3,000 strain sensors in its body, mostly on the legs and in vibration receptors located near the leg joints. Each strain sensor comprises a series of arrays of tiny parallel slits in the compound lyriform slit sense organs that detect vibrations and movements. When forces are applied the slits are compressed and stimulated.The researchers found that the sensitivity of the slits decreased with their length and that nanoscale compressions from 1.4 to 30 nanometers caused by vibrations and air flows could be detected. These compressions corresponded to forces as low as 0.01 mN.Spiders can also see prey even at low light levels, and can detect odors through hair sensors (pedipalps) on their feelers.The results of the study were published in the Journal of the Royal Society Interface.last_img read more

3D virtual birth simulator may help avoid complicated births

first_img Citation: 3D virtual birth simulator may help avoid complicated births (2013, December 10) retrieved 18 August 2019 from Explore further More information: … birth-simulator.html Researchers pioneer first patient-specific 3-D virtual birth simulator © 2013 Phys.orgcenter_img This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. The team prepared their presentation last month for the International Conference on E-Health and Bioengineering in Romania, which took place from November 21 to November 23. Dr Rudy Lapeer, from the university’s school of computing sciences, said, ‘We are creating a forward-engineered simulation of childbirth using 3D graphics to simulate the sequence of movements as a baby descends through the pelvis during labor.” The study is titled, “Towards a Forward Engineered Simulation of the Cardinal Movements of Human Childbirth’.” The authors are Zelimkhan Gerikhanov, Vilius Audinis and Rudy Lapeer.The user inputs the patient’s relevant anatomical data –size and shape of the pelvis, the baby’s head and torso, for example. The simulation software will see ultrasound data used to re-create a geometric model of a baby’s skull and body in 3D graphics as well as the mother’s body and pelvis. This will make the medical team more aware of scenarios that can take place during birth. For example, one would see if the baby’s shoulders could get stuck during childbirth. According to the university release, “Programmers are also taking into account the force from the mother pushing during labor and are even modeling a ‘virtual’ midwife’s hands which can interact with the baby’s head.”Lapeer said, “We hope that this could help to avoid complicated births altogether by guiding people in the medical profession to advise on caesarean sections where necessary.” Lapeer has cited his general research interests as “mainly in medical visualization, surgical navigation and simulation, physics simulation and biomechanics.” He also described what he and his team have done in the specific area of human childbirth mechanics. “We have studied fetal head moulding using finite element analysis and more recently investigated the effect of forceps delivery on the fetal head and the biomechanics of shoulder dystocia.” ( —University of East Anglia last month announced that UEA researchers have pioneered a patient-specific 3D virtual birth simulator. The research’ aim is a virtual birthing simulator that can help doctors and midwives prepare for unusual or dangerous births. “Patient-specific” is the key aspect of their work, as the program takes into account the mother’s body shape and the position of the baby to predict what might take place during the birth event.last_img read more

When Australian Masterchef comes for breakfast

Bringing together the hospitality fraternity, a breakfast session with Masterchef Australia host George was organised in the Capital recently. This early morning session, organised by Fine Food India, brought the who’s who from the hospitality business, chefs and restaurateurs to talk about food. George Calombaris made up for the absence of his co-host Gary Mehigan and said: ‘Gary is totally Bollywood. He would have loved to be here had he felt better.’ Also Read – ‘Playing Jojo was emotionally exhausting’Goerge said what is special about Masterchef Australia is that it has roped in cuisines from across the world. There was a whole round of questions the restaurateurs and the public asked George. On being asked about his status as a celebrity chef, he said: ‘I deny the concept of the celebrity chef. I am a chef, that’s it.’For the young food enthusiasts who had gathered there who dreamt of becoming chefs in future, George said, ‘It is very important to engage oneself in cooking and also know where the raw material comes from. The farms ideally and not the supermarkets.’ Also Read – Leslie doing new comedy special with Netflix‘I buy only my toilet papers from the supermarket,’ quipped the chef.About Indian food he said Gary knew more than him. ‘He could actually tell you when and where the food originated and how was it used and all that.’ As for himself, the chef admitted that he couldn’t help wonder about the Indian food especially jalebis which are fermented lactose. ‘It is amazing to see such diverse food culture wherever we go,’ said the 34-year-old chef.When asked whether it is more important to have technical skills or creative ones, he said that it is a mix of both. ‘There are a lot of chefs with so much technical skills and then there are those who does it differently. So we need both these.’‘There is also Nigella, who absolutely makes anything out of the leftovers. This is also something different,’ he added.  The event was concluded with an elaborate breakfast spread. read more

Celebrating 50 years of education

first_imgOutlining the journey of Kendriya Vidyalaya Sangathan, a travelling photo exhibition kicked off in the capital today to carry forward the institute’s Golden Jubilee celebrations. Inaugurated by the Minister of State, Human Resource and Development, Jatin Prasada in the presence of Comissioner of KV Sangathan, Avinash Dixit and other senior officials of Ministry of HRD and KVS, the exhibition was followed by a vibrant cultural evening by students from different central schools. Also Read – ‘Playing Jojo was emotionally exhausting’Beaming in their uniforms, student scouts marched in the corridors of Indira Gandhi National Centre for Arts to welcome the arrival of dignatories. After watching the visual journey depicted through the pictures and paintings of students and teachers of KVS, Jatin Prasada commented,’ The photo exhibition portrays the commencement of KVS, its glorious past and the road ahead for its future. The paintings put up by the students are delightful.’ The travelling photo exhibition, planned in 14 cities in India starting from New Delhi, will showcase the journey of KVS from 20 schools to 1093 vidyalayas and dwell on its initiatives and innovative practices for promoting quality education and capacity building of its teaching staff. Also Read – Leslie doing new comedy special with NetflixThe exhibition about growth and evolution of KVS will spread awareness about the institute’s role in the field of school education. It will be stationed at 14 cities, namely, New Delhi, Chandigarh, Lucknow, Patna, Jaipur, Kolkata, Guwahati, Bhopal, Ahmadabad, Mumbai, Bnagalore, Trivandrum, Chennai and Hyderabad. The Golden Jubilee celebrations began with the inaugral function organised at Vigyan Bhawan on 6 July. The Prime Minister of India, Dr. Manmohan Singh unveiled the new logo of KVS during this ceremony. In the cultural presentation today, Jatin Prasada addressed the audience and discussed the imperative issues related to education in our country. He emphasised, ‘We are grappling with the issue of an imbalance in education. Inequality pervades on the basis of gender, caste and class even in this field. We need to provide skill based education and I hope that KVS would continue delivering quality education.’last_img read more

Revealing the charm of Cham

first_imgIndira Gandhi National Centre for the Arts (IGNCA)  is hosting an International Conference on Cham Art Heritage of Vietnam. The Cham people are the inhabitants of mountainous region of Central-South Vietnam, Cambodia and Laos. The Cham civilization has been focus of studies and conferences in the field of history, language, religion, culture, art and architecture. However, its inner connections and its external relations have so far not been studied in depth.  Also Read – ‘Playing Jojo was emotionally exhausting’The two-day international conference will comprises of academic sessions and cultural programmes on both the days and Odishi dance recital by Madhavi Mudgal and disciples on its closing day. The event will be inaugurated on 25 April at IGNCA. The conference will be carried out in six sessions and one sub-session.The proposed panels of the conference are: Polynesian, Indian and Indigenous context of Cham art, interface of art and ecology in Cham art, connections of Cham art with Indian and South East Asian art styles, Cham architecture and its connection with India and South East Asia, Chams musical instruments in the wider context of Indian and South East Asian traditions, many research on Champa based on epigraphy and recent field work including Bhasa and Sahitya sastriya study of the inscriptions of Champa. The various sessions will be chaired by eminents like- Satya Vrat Shastri, Anton O. Zakharov, Phan Thi Thu Hien, Ganga Nath Jha, Philippe Delanghe, Himansu Prabha Ray, Zsuzsanna Renner, Claude Jacques and Lokesh Chandra.last_img read more

Baby dies in womb after doctor gives wrong injection to mother

first_imgKolkata: Family members of a pregnant woman on Wednesday alleged that the baby in her womb died because of medical negligence of doctors in the Kharagpur Chandmari Sub-divisional hospital. But the hospital authorities denied the charge.The incident had triggered tension among the patients undergoing treatment in the hospital following the incident. The family members of the victim staged a protest demonstration inside the hospital campus creating chaos. Also Read – Heavy rain hits traffic, flightsA huge contingent of police rushed to the spot and brought the situation under control. The demonstration was lifted by the family members following the intervention of the senior police officers who assured them that the matter would be looked into.The family members of the woman Jhunu Patra, a resident of Benapur area, said was brought to the hospital on Saturday. She complained of labour pain on Tuesday night. It was alleged that the on duty nurses called up the doctor under whom the patient was admitted. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed The doctor allegedly told the nurses to administer an injection on the patient. The family members of the patient alleged that she felt relieved after she was administered the injection but stopped feeling any movement of the baby following the incident. When the caesarean delivery was performed on the patient, the baby was found dead.This infuriated the family members of the victim. They staged a demonstration alleging negligence on the part of the hospital. They also demanded a high level inquiry into the incident. They questioned the authority and said why would the doctor instruct an on-duty nursing staff over phone to administer a particular injection without seeing the condition of the patient. The baby died in the mother’s womb as wrong injection was administered on the patient, alleged the family members of the victim.A senior official of the hospital said the death of the baby could be due to many other reasons. He also denied the charges of medical negligence. The doctors in the hospital might have been trying for a normal delivery of the dead baby, he said. Post-mortem of the dead baby may be done to ascertain the real reason for the death.last_img read more

Soon Bangladesh to open Visa office in Siliguri

first_imgDarjeeling: Bangladesh would soon be opening a Visa office in Siliguri that will be extending consular activities. After establishing air links with Guwahati, scheduled for mid 2019, Bangladesh has plans to connect Bagdogra by air link as well. These steps will boost people-to-people contact, thereby benefitting both the countries.The Integrated Checkpost at Banglabandha border is a few kilometers away from Siliguri. Addressing media persons in Darjeeling on Tuesday, Syed Muazzem Ali, High Commissioner, Bangladesh High Commission, Delhi, stated that relations between both the countries has reached a new high with efforts from both the countries and the Visa office in Siliguri would boost exchange between the two countries. Also Read – Heavy rain hits traffic, flights”This is the golden era of India-Bangla relations. After 68 years, the enclave issue has been resolved. There are no border disputes between the two countries, whether on land or water. There have been no security problems in the past 9 years” stated the High Commissioner. Stress is being given to improve communication. Before 1965 there were 8 railway links with India. After 1965, services had come to a grinding halt. “Already, 6 of these links have been revived. The remaining two will be revived soon,” stated the High Commissioner. Soon, a railway link will be established between Akhaura in Tripura and Chittagong port in Bangladesh.last_img read more