Команда исследователей из Технологического института Вирджинии разработала усовершенствование для липкой ленты, которое полностью меняет ее свойства. Классический «скотч» либо слишком хорошо липнет к поверхности, либо легко от нее отлипает — но не все сразу. Новая версия совмещает два этих ценных качества.
Основу идеи ученые почерпнули в киригами — японском искусстве декоративной резки по бумаге, во время которой плоский лист приобретает трехмерную форму. Достигается это за счет нанесения прорезей в бумаге нужной формы и в определенных местах. Из-за этого при смещении в стороны материал меняет форму.
Ученые взяли обычную липкую ленту из магазина и сделали на ней прорези в виде символа «U». После того как ленту наклеивали на поверхность, ее пытались отлепить, потянув в сторону нижней или верхней части символа. В первом случае лента легко отклеивалась, во втором ее адгезия возрастала в 60 раз и оторвать ленту было крайне сложно.
Причина такого явления в изменении вектора приложения силы к слою клея – он либо растягивается, либо сжимается. Отсюда и изменение силы адгезии. Эксперименты показали, что скрепленные модернизированным суперскотчем коробки выдерживают чрезвычайно большие нагрузки. Также его можно использовать для удобного крепления временных объектов — например, носимых устройств, чтобы потом легко их снять.
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In contrast, the prevalence of gynecomastia increased from 7% at baseline to 19% on the finish of an AAS cycle in the HAARLEM study (39).
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