國際會(huì)議口頭報(bào)告ppt演講內(nèi)容準(zhǔn)備模板

1、The Draft of Academic Presentation國際會(huì)議的口頭報(bào)告模板，每頁 ppt 你需要講什么東西需要分頁詳細(xì)寫， 盡量口語化，如下是本人參加比利時(shí)會(huì)議的模板，供大家參考。P1開場白：I am so honored to be with you to communicate academic questions and ideas.The tile of my academic presentation is“The preparation and catalytic performance of porous silicananotube functioned wit

2、h heteroatoms”I shall only take ten minutes of your time.I will talk about the topic on the preparation of porous materials.P2First of all, i wanna introduce myself. I come from nanjing university of technology, nanjing city, china.P3The content is listed as follows.P4All our researches are conducte

3、d by the academic thoughts. Generally speaking, we are committed to porous materials. In order to explore high-performance functionalized materials for Pilot experiments and scale-up production; we tune the structure, such as composition and morphology step by step and optimize them further. What s

4、more, the possible synthesis mechanisms are also investigated. Today, the presentation is based on the right-hand branch.P5It is known that mesoporous silica have excelle nt characters as the catalyst carrier, such asBut due to lack of active sites, we have to introduce organic or inorganic species

5、as active sites. And the catalytic performance need to be further improved.P6As we know, the three factors including activity, scale and diffusion factor play decisive role in the catalysis, affecting the yield, selectivity, stability strongly. In our presentation, we mainly focus on the influence o

6、f scale factor on the catalysis.P7Due to lack of active sites for mesoporous silica, two main methods (surface loading, modified framework) are widely reported, by which various organic or inorganic active sites can be immobilized on the surface or incorporated into the framework of mesopoous silica

7、.P8Though various morphologies of mesoporos silica were widely synthesized, the synthesis of the mesoporos silica, with three simultaneous characteristics including doped metal, mesoporous structure and specific morphology, is always a challenge, which is rarely reported.In other words, for our case

8、 exploring a proper condition, at which the silicon and metal sources can simultaneously hydrolyze, can ensure a desired material.P9Next, let look at the synthetic steps. Firstly,.Then,.After that,.At last, we obtained the products.P10In this work, by changing the synthesis conditions, such as ,and

9、so on, the pure mesoporous silica with different morphologies were synthesized, including nanosphere, nanorod, helix, capsule and nanotube. We will focus on the preparation and catalytic application of mesoporous silica with nanotube morphology.P11the SEM images of samples: A1, A2, A3 are shown in t

10、he figure. It can be seen that sample a1 is nano wire-like with len gth of about 2(ima nd diameter of about 100nm. When the amount of . is 0.04 g,the morphology of sample A2 became to be short and thick rods and the size is about 1(imi n len gth and400nm in diameter, respectively. With further incre

11、asing the amount of ., the sample A3 and A4 turned to be spherical morphology. It also can be seen that the diameters of samples A3 and A4 are substantially the same about 450nm. However, the spherical morphology of A4 is more regular than that of A3.The XRD patterns showed four reflection peaks att

12、ributed to (100), (110), (200) and (210), respectively, due to the hexagonal sructure.P12Then, we keep the same amount of ., increasing the amount of We found that the length increased gradually. The XRD patterns also showed the hexagonal sructure of samples B1, B2, B3, B4.P13Moreover, an additional

13、 proof of the hexagonal symmetry structure is given by TEM and the FT pattern. The N2 adsorption-desorption isotherms of the samples B1, B2, B3, B4 exhibit a typical type-IV isotherm.According to the table of structural parameters, we can find that the specific surface area and total pore volume inc

14、rease gradually, the thickness of wall decrease and there is no obvious change in diameter.P14Furthermore, the possible synthesis mechanism of the mesoporous silica nanotube in dual templates system was proposed. We suggest that due to electrostatic repulsion between positively charged ammonium ions

15、 from hydrated ammonia molecules and hydrophilic groups of ., especially in ammonia (NH3, 25wt.%) solution, the high concentrated ammonium ions provide a crowded and repulsive space to prevent the conjunction of . molecules, leading to the formation of the rod-like micelles as template to form pore

16、structure instead of sphere-like ones.The role of co-template . is suggested to tune the length of rod-like micelles by arranging itself along the axis of channel with PEO and PPO part immersed in the+hydrophilic and the hydrophobic group of CTA respectively. As a result, the mesoporous nanotube wit

17、h different length will be synthesized. However, the non-polar . micelles are not affected by positively charged ammonium. When the amount of co-template increased further, the non-polar . micelles tend to control the morphology of micelles which are sequentially from nanotube, short rod to sphere-l

18、ike ones.It my be the reason that the non-polar . micelles would provide stronger attractive force than the electrostatic repulsion derived from the PEO block, ammonium ions and head group of ., respectively.P15In order to investigate the influence of the morphology and structure of mesoporous silic

19、a on catalytic performance, the samples with copper incorporated were synthesized.P16The figure shows the SEM and TEM images of samples a1, a2, a3, from which we can see they represent in creme ntal len gth in the range of about 0.5, 1.0 and 1.5(im,a nd in sig ni fica nt cha nge in diameter around 1

20、00nm. In XRD patterns, there are also four reflection peaks for the samples with copper incorprated, respectively, which indicates the incorporation of the inorganic copper salt has no obvious effect on the hexagonal sructure and the ordered degree of pore structure. Moreover, the trends in length a

21、nd the diameter of nanotube are illustrated.P17The N2 adsorption-desorption isotherms of the samples a1, a2, a3 exhibit a typical type-IV isotherm according to the IUPAC classification and no hysteresis loop at the relative pressure range of 0.2 p0提 0.4,implyi ng the samples not only have ordered mesoporous structure but also the uni form pore size. Moreover, the pore diameters did not change significantly at different weight ratio of ./ Themost probable pore sizes of samples a1, a2, a3 are determined to be 2.71, 2.50, 2.44 nm, respectively. The structural parameters are listed in following t