兰大纳米化学VIP

1、.,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 material

2、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 .,.,2.What do you expect to benefit from “nano-technology”,Answer : I want to use the “nano-technology” to make me have an undying life. When some

3、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.,.,3.Why interfaces are important?,Answer: The properties of can determined the function and the extrinsic properties of a materials. We can change the materials function by ch

4、ange 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.,.,4.Which is better in self-assembly: noncovalent or covalent bonding?,Answer: I think the noncovalent

5、 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 when using covalent bonding , once having random error, it is more difficult to repair a

6、nd very hard to get the lowest energy.,.,5.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 materials surface function such as applying to reduce friction, anti-wear and so on. SAMS has the advantages

7、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 effect.,.,6.Image what you could do with chemical patterns?,Answer: It is used for the immobilization of enzyme,

8、 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,.,7.What are the unique properties of carbon nanotubes?,Answer: Carbon nanotubes are generally regarded as the single hardest mater

9、ials 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 properties 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

10、 sliding of the inner core nanotube. This sliding occurs with very little or no friction at all and usually leads to rotational bearing.The nanotube structure usually has an effect on the electrical properties of graphene owing to its electronic structure that is quite unique. Some superconductivity

11、 properties have also been registered with some of these nanotubes and although there are several other experiments that disagree with this assertion, these reports continue to create a stir among experts.The thermal properties of carbon nanotubes are quite unique too because these nanotubes are mos

12、tly expected to have good conduction. Ballistic conduction is actually a property that is shown by the nanotubes as they go about their thermal conduction. Another vital issue in the properties of these nanotubes is the issue of toxicity. When dealing with nanotechnology, many experts have raised se

13、veral questions about the toxicity of the nanotubes. This study and research is still in its early stages and there is quite a lot criticism still 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 quest

14、ion of toxicity.,.,8.Why researchers rediscovered Graphene was given Noble Prize?,Answer: Its a worthy Nobel, for the 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

15、batteries. Graphene is stronger and stiffer than diamond, yet can be stretched by a quarter of its length, like rubber. 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 wearab

16、le electronics are beginning to switch to graphene, which is thinner and potentially less expensive to produce. Much of 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 .,.,9. In the a

17、bove mentioned methods for synthesizing nanopaticles, which one do you prefer? Why?,Answer: Compared 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

18、 is more simple than chemical methods, and easy to control.,.,10.Try 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:,.,11.Try draw a energy diagram of the dye sensitized TIO2 Solar Cell,A

19、nswer:,.,12.When excited by lights, what would happen to the two nanoparticles A and B?,Answer: A: The electrons on the shell valence band are excited to the conduction band and then transferred to the conduction band of the core, the cavity of the shell is transferred to the nuclear valence band. B: The price of the electronic excitation to the conduction band on Shell1, leaving some holes in the price abo