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《奇幻科学城》百变玻璃秀 博士团现场砸栈道玻璃

2017-09-01 08:41:30   中国网

玻璃栈道真的安全吗

奇幻博士团和大教授揭秘“玻璃心”

中国网娱乐9月1日讯 你知道生活中常见的镜子是怎么制作的吗?你想过用剪刀来裁剪玻璃吗?神奇的玻璃泪滴——鲁伯特之泪为什么可以如此坚硬?本周五晚22:00辽宁卫视《奇幻科学城》邀请清华大学博士、中国建筑材料科学研究总院玻璃深加工技术研究所副所长李要辉担任本期神奇大教授,携手奇幻博士团和超级孩子王强子,带领好奇萌娃团一起解放天性,来了一场和科学有关的疯狂破坏大作战。

“银镜反应”自制“烧瓶镜” 玻璃浸水变成“纸”?

玻璃由于其透光、廉价的特点在生活中有各种各样的应用,而最广泛的应用就是制作镜子。在近代,一直到1835年,德国化学家李比希才发现了可以用银和玻璃制作出现在使用的镜子,但为什么要用银和玻璃来做镜子呢?李要辉现场带领孩子王和萌娃用烧瓶、葡萄糖溶液、银氨溶液,经过不断摇晃成功制作出烧瓶小镜子,这就是神奇的“银镜反应”。李要辉解释因为银具有非常高的光泽度,玻璃的表面很光滑,银就很容易镀到玻璃表面,而银的反光性和玻璃的透光性特别好,因此两者一组合就做成了现在使用的镜子。

在一般的温度状态下,玻璃是易碎的,但在有些情况下,居然可以用剪刀裁剪玻璃,博士团由此提出疑问“哪种情况可以用剪刀轻松裁剪玻璃?”,萌娃们答案五花八门,有的认为放在冰箱里制冷可以,而部分萌娃觉得放在火上加热可行,博士团为了给孩子们呈现最直接的效果,现场做实验验证,发现当把玻璃放在水里浸泡时,可以把正方形的玻璃剪成四角圆滑的形状,李要辉分析玻璃表面有非常多肉眼看不到的微裂纹,玻璃放到水中之后,水分子会和小裂纹发生化学反应,因此小裂纹断裂所需的能量就会降低,进而剪刀裁剪玻璃的力量就会小很多,同时玻璃的开裂方向也会沿着裁剪的方向开裂,这样在水中就可以粗糙的完成一个玻璃的裁剪了。

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