According to reports recently organized by the Physicist Organization Network, the lightweight skeletons of organic materials such as natural algae outperform products made from the same materials. Scientists have been skeptical that this difference is related to the hierarchical architecture of biomaterials—the silica-based bioskeleton consists of different structural elements, some of which are only a few nanometers. Now, American scientists have simulated this structure by creating nano-hollow ceramic frameworks, and found that although more than 85% of this microcell is air, it does have an amazing degree of toughness. The research was published on the latest issue of the nano-materials magazine website. The leader of the study, Julian Gorell, a professor of materials science and mechanics at the California Institute of Technology, said: "The latest research helps scientists use nanomaterials to make hard, lightweight 'metamaterials'." Gorell's team has demonstrated that solids will exhibit very different properties on a larger scale than on a nanometer scale. For example, at the nanoscale, some metals increase in strength by 50%; some amorphous materials also become more flexible rather than more brittle. Goreir said: "We are studying this size effect in depth and using them to create a true three-dimensional structure." They first designed a lattice structure with an ever-repeating octahedral unit cell by digitizing it, which is similar to the periodic lattice structure in diatoms. Next, it uses a two-photon photolithography technique to change the structure. A three-dimensional polymer lattice is formed, and then titanium nitride (TiN) is coated on the surface of this lattice and the core of the polymer is removed. The resulting ceramic nanolattice consists of hollow struts and no more than 75 nm. The thick inner wall is constructed. Later, they performed stress tests on a single octahedral unit cell of the ceramic lattice, and the results showed that it has extraordinary tensile strength, and it will not break under continuous pressure; Titanium breaks down under even less pressure. Goreir explained: “Ceramics are apt to break because of their flaws (holes and blanks, etc.) The hard and pressure-resistant capabilities of nanostructures stem from the fact that when an object becomes small enough, its flaws become Very small, the possibility of finding fragile and brittle crucibles in its interior is extremely low, so although structural mechanics suggests that porous structures made of titanium nitride can become very fragile - because of its thin inner walls, we can Break this rule by reducing the thickness or size of the material and tuning its microstructure or atomic configuration." In a paper to be published in the "Advanced Engineering Materials" magazine, the Gorell team used gold instead of ceramic to create the same nanocrystalline lattice. At present, the largest structure they have produced using the new method is a 1 mm long tube, and the compressive test performed on it shows that the entire structure is very hard. Goreir said that the latest research can fundamentally change the way people make materials. She said: "Using this method, we can carry out reverse design. For example, we first assume that the required material has certain characteristics (such as strength or thermal conductivity, etc.), and then use the best materials to design the optimal structure. And ultimately we get the material we want. This versatile construction technology can be used to make light and flexible small-scale components, such as batteries, interfaces, catalysts and implantable biomedical devices." (Liu Xia) Construction Industry Roll Forming Line Steel Rolling Machine,Construction Roll Forming Machine,Construction Industry Roll Forming Machine,Construction Industry Roll Forming Line Xinxiang Tianfeng Machinery Manufacture Co., Ltd. , http://www.tfrollforming.com