February 23, 2021
Enable A Whole Swath Of Products
More recently, some scientists have been exploring kirigami as a way to develop new, functional materials. The kirigami cuts give the film not only stretch, but also better grip. Boston: MIT scientists have developed a flexible, sticky bandage - using a Japanese paper-cutting art form called kirigami - that can be applied to tricky places like scraped up knees and elbows."Currently in the soft electronics field, people mostly attach devices to regions with small deformations, but not in areas with large deformations such as joint regions, because they would detach," said Zhao, lead author of the study published in the journal Soft Matter.The researchers fabricated thin kirigami films by pouring a liquid elastomer, or rubber solution, into 3D-printed molds..
Adhesives bandages are very commonly used in our daily life, said Zhao.The key to the films clinginess is a pattern of slits that the researchers have cut into the film."In most cases, people make # cuts in a structure cotton athletic tape for sale to make it stretchable," Zhao said.Originally an Asian folk art, kirigami is the practice of cutting intricate patterns into paper and folding this paper, much like origami, to create beautiful, elaborate three-dimensional structures.With the application of a three-volt power supply, the pad maintains a steady temperature of 100 degrees Celsius.Researchers from Massachusetts Institute of Technology (MIT) in the US attached the "kirigami film" to a volunteer's knee and found that each time she bent her knee, the film's slits opened at the centre, in the region of the knee with the most pronounced bending, while the slits at the edges remained closed, allowing the film to remain bonded to the skin.
The group has also engineered a wearable electronic film outfitted with light-emitting diodes."But when you try to attach them to places that encounter large, inhomogenous bending motion, like elbows and knees, they usually detach," Zhao said. All three films can function and stick to the skin, even after 100 knee bends."I think kirigami film is one solution to this problem commonly found in adhesives and soft electronics," he said.Kirigami-patterned adhesives may enable a whole swath of products, from everyday medical bandages to wearable and soft electronics, said Ruike Zhao from MIT."But we are the first group to find, with a systematic mechanism study, that a kirigami design can improve a material's adhesion," he said.
The film can be made from a wide range of materials, from soft polymers to hard metal sheets, researchers said.Once cured and lifted out of the molds, the thin elastomer layers were studded with rows of offset slits.Each mold was printed with rows of offset grooves of various spacings, which the researchers then filled with the rubber solution.To demonstrate potential applications, the group fabricated a kirigami-patterned adhesive bandage, as well as a heat pad consisting of a kirigami film threaded with heating wires.The thin, adhesive film can stick to highly deformable regions of the body, such as the knee and elbow, and maintain its hold even after 100 bending cycles.The key to the film's clinginess is a pattern of slits that the researchers have cut into the film.The kirigami cuts give the film not only stretch, but also better grip: The cuts that open release tension that would otherwise cause the entire film to peel away from the skin
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February 07, 2021
Usually Falls On The Full Moon
Lord Krishna once happened to have an injured hand, with blood oozing out from his finger.Lord Krishna once happened to have an injured hand, with blood oozing out from his finger. Rukmini, his wife, immediately sent her maid-servant to get a bandage while Draupadi simply tore off a part of her sari and bandaged his finger. Lord Krishna said that with this loving act, she wrapped him in debt and he was obliged to repay each thread when the time arrives. He uttered the word "akshyamâ€, meaning "may it be unendingâ€.
Keeping his promise, Lord Krishna saved Draupadi from being disrobed by making her sari endless. She was duly protected and saved by Lord Krishna. This is one of the stories related to the origin of the festival of Raksha Bandhan. But it truly conveys the meaning and message of the festival.Raksha Bandhan, also called Rakhi-Purnima, is basically a Hindu religious festival, which has shades of secular aspects as well. It is an annual festival that ritually celebrates the love and duty between brothers and sisters. Raksha Bandhan — the tie of protection — is the occasion to remember and revive the pure bond of love and protection. A rakhi may be a simple thread or the modern version can be in the form of a wrist-watch or a silver bangle, but symbolic value remains the same.On the day of rakhi, which usually falls on the full moon in the month of Shravan, brothers and sisters get together to perform the ritual and celebrate the function. Donning beautiful colourful dresses, sisters tie the rakhi on the wrists of their brothers and the ritual is performed in front of a diya or a lighted lamp. The sister offers a prayer for the good health and prosperity of the brother.
One of the prayers is — "May the lord of all beings protect you, may the one who creates, preserves and dissolves life protect thee... May all negativity and fears, spirits malignant and unfriendly flee thee †The sister offers sweets and the brother gives her a token gift in the form of money, dress or a piece of jewellery.Raksha Bandhan is also known as punya-pradayak parva, the merit-giving festival and also as vishtodak parva, the vice eliminating festival. It is believed that the rakhi is a sacred thread and the one who wears it will be protected from snakes, demons and other evils. In Mumbai, the festival is known as Narial Purnima where coconuts are thrown into the river to propitiate the sea god. So traditionally, Raksha Bandhan is not only restricted to brother-sister ties. Rakhi is also tied on the wrists of soldiers since they are the true protectors of all. Rabindranath Tagore had invoked Raksha Bandhan to inspire love and harmony between Hindus and Muslims. The need of the hour is to imbibe the values of this festival — love, protection and harmony — in our daily lives.Kulbir Kaur teaches sociology at Shyama Prasad Mukherji College, Delhi University
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