兰大纳米化学-课件.ppt

1、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 material is r

2、eally 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 organs in my body be

3、come 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 change the properties of the in

4、terfaces.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 bonding is better,because the noncov

5、alent 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 and very hard to get the lowest energy.5.What i

6、s 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 of high order and orientation,high density,low structu

7、re 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,and the enzyme molecule is modified on the carrier.The surface

8、 modification of medical materials,such as the use of heparin to improve their biocompatibility in vivo7.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 pres

9、sure 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 sliding of the inner core nanotube.This sliding occurs with very little

10、 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 properties have also been registered with some of these nanotubes and alt

11、hough 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 mostly expected to have good conduction.Ballistic conduction is actually a pro

12、perty 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 several questions about the toxicity of the nanotubes.This study and research is

13、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 question of toxicity.8.Why researchers rediscovered Graphene was given Noble Prize?Ans

14、wer: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 batteries.Graphene is stronger and stiffer than diamond,yet can be stretched by a quarte

15、r 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 wearable electronics are beginning to switch to graphene,which is thinner and potentially less expen

16、sive 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 above mentioned methods for synthesizing nanopaticles,which one do you prefer?Why?Answer:Compared to chem

17、ical 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.10.Try draw an energy band diagram of a metal and a n-

18、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 CellAnswer:12.When excited by lights,what would happen to the two nanoparticles A and B?Answer:A:The electrons on the shell valence ba

19、nd 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 above.13.What is the advantages of controlled drug delivery systems compared with conventional methods?Answer:1.Prolong the efficacy time,reduce the frequency of administration2.Reduce the damage to the body3.Improve the utilization rate of drugs4.Drugs are released in specific location