兰大纳米化学-课件

1、兰大纳米化学兰大纳米化学1.List some products claim to be “nano-product” and give your opinions about whether they are real “nano” or not.Answer: In my daily life, my mobile phone may become hot when playing games or having battery charging, so I bought a heat sink made of nano-material(graphene).I think if the

2、material is really made of graphene ,it is a real “nano-product” because Nano-materials , refers to the size of its structural units between 1 nm to 100 nm range .1.List some products claim to 2.What do you expect to benefit from “nano-technology”Answer : I want to use the “nano-technology” to make

3、me have an undying life. When some organs in my body become weaker, I may use the “nano-technology” to change them and make me have a sound body and live long.2.What do you expect to benefi3.Why interfaces are important?Answer: The properties of can determined the function and the extrinsic properti

4、es of a materials.We can change the materials function by change the properties of the interfaces.The molecule between the inner and the interface are under different force, which cause the interface molecule have special properties than the side molecule. 3.Why interfaces are important4.Which is be

5、tter in self-assembly: noncovalent or covalent bonding? Answer:I think the noncovalent bonding is better, because the noncovalent effect is more reversible, that can make the molecule combined on their own, and get a lower energy ,they are more stable, besides they can also have self-healing.But whe

6、n using covalent bonding , once having random error, it is more difficult to repair and very hard to get the lowest energy.4.Which is better in self-asse5.What is the advantages of SAMS over the other molecular assembly systems, such as LB films and liquid crystals?Answer:SAMS can use to improve the

7、 materials surface function such as applying to reduce friction, anti-wear and so on.SAMS has the advantages of high order and orientation, high density, low structure fault and stability.SAMS can adapt to a variety of surfaces and also can change the type of chain to achieve different kinds of effe

8、ct.5.What is the advantages of SA6.Image what you could do with chemical patterns?Answer:It is used for the immobilization of enzyme, and the enzyme molecule is modified on the carrier.The surface modification of medical materials, such as the use of heparin to improve their biocompatibility in vivo

9、6.Image what you could do with7.What are the unique properties of carbon nanotubes?Answer: Carbon nanotubes are generally regarded as the single hardest materials known to man. A single walled nanotube is able to withstand a pressure that amounts to 24 GPa Nanotubes are also known to have kinetic pr

10、operties that make them get nested with each other. There is an outstanding telescoping property that they tend to display with time and this usually involves sliding of the inner core nanotube. This sliding occurs with very little or no friction at all and usually leads to rotational bearing.The na

11、notube structure usually has an effect on the electrical properties of graphene owing to its electronic structure that is quite unique. Some superconductivity properties have also been registered with some of these nanotubes and although there are several other experiments that disagree with this as

12、sertion, these reports continue to create a stir among experts.The thermal properties of carbon nanotubes are quite unique too because these nanotubes are mostly expected to have good conduction. Ballistic conduction is actually a property that is shown by the nanotubes as they go about their therma

13、l conduction. Another vital issue in the properties of these nanotubes is the issue of toxicity. When dealing with nanotechnology, many experts have raised several questions about the toxicity of the nanotubes. This study and research is still in its early stages and there is quite a lot criticism s

14、till going on. It is expected that over the years the results will help to give experts a little more understanding of how these nanotubes deal with the question of toxicity.7.What are the unique properti8.Why researchers rediscovered Graphene was given Noble Prize?Answer: Its a worthy Nobel, for th

15、e simple reason that graphene may be one of the most promising and versatile materials ever discovered. It could hold the key to everything from super-small computers to high-capacity batteries.Graphene is stronger and stiffer than diamond, yet can be stretched by a quarter of its length, like rubbe

16、r. Its surface area is the largest known for its weight.The energy applications of graphene are also extraordinarily rich. Companies currently using carbon nanotubes to create wearable electronics are beginning to switch to graphene, which is thinner and potentially less expensive to produce. Much o

17、f the emerging research is devoted to devising more ways to produce graphene quickly, cheaply and in high quantities.Besides, the graphene also have other advantages .8.Why researchers rediscovered9. In the above mentioned methods for synthesizing nanopaticles, which one do you prefer? Why? Answer:C

18、ompared to chemical methods, I prefer to use physical methods because the use of physical methods can reduce the occurrence of chemical reactions, that will reduce pollution, in addition, the physical method is more simple than chemical methods, and easy to control.9. In the above mentioned meth10.T

19、ry draw an energy band diagram of a metal and a n-type semiconductor, in which illustrate “Valence band ”, ” Conduction band”, “Band gap” and “Fermi level” Answer:10.Try draw an energy band dia11.Try draw a energy diagram of the dye sensitized TIO2 Solar CellAnswer:11.Try draw a energy diagram o12.When excited by lights, what would happen to the two nanoparticles A and B?Answer:A: The e