国际会议口头报告ppt演讲内容准备模板

1、The Dr af t of Academi c Pr esent at i on国际会议的口头报告模板，每页ppt你需要讲什么东西需要分页详细写，尽 量口语化，如下是本人参加比利时会议的模板，供大家参考。P1开场白：I amso honored to be with you to communicate academic questions and ideas.The tile of my academic presentation is“The preparation and catalyticperformance of porous silica nanotube functioned

2、 with 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 condu

3、cted by the academic thoughts. Generally speaking, we arecommitted to porous materials. In order to explorehigh-performancefunctionalizedmaterialsfor Pilotexperimentsandscale-upproduction;wetunethe structure,such as compositionandmorphology stepby stepand optimize themfurther. Whats more, thepossibl

4、e synthesis mechanisms are also investigated.Today, thepresentation is based on the right-hand branch.P5It is known that mesoporous silica have excellent characters as the catalyst carrier, suchas .But due to lack of active sites, we have to introduce organic or inorganic species asactive sites. And

5、 the catalytic performance need to be further improved.P6As we know , the three factors including activity, scale and diffusion factor play decisiverole in the catalysis, affecting the yield, selectivity,stability strongly. Inour presentation, we mainly focus on the influenceof scale factor on the c

6、atalysis.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 sitescan be immobilized on the surface or incorporated into the framework of mesopoous silica.P8Though various morphol

7、ogies of mesoporos silica were widely synthesized, thesynthesis of the mesoporos silica, with three simultaneous characteristics including dopedmetal, mesoporous structure and specific morphology, is always a challenge, which israrely reported.In other words, for our case exploring a proper conditio

8、n, at whichthe silicon and metal sources can simultaneously hydrolyze, can ensure a desiredmaterial.P9Next, lets look at the synthetic steps. Firstly,.Then,.Afterthat,.At last, we obtained the products.P10In this work, by changing the synthesis conditions, such as, and so on, the puremesoporous sili

9、ca with different morphologies were synthesized, including nanosphere,nanorod, helix, capsule and nanotube. Wewill focus on the preparation and catalyticapplication of mesoporous silica with nanotube morphology.P11the SEM images of samples: A1, A2, A3 are shown in the figure. It can besee n that sam

10、ple a1 is nano wire-likewith len gth of about 2mand diameterof about 100nm. Whenthe amount of . is 0.04 g, the morphology of sample A2 became tobe short and thick rods and the size is about 1min lengthand 400nm in diameter, respectively. With further increasing the amount of ., the sampleA3 and A4 t

11、urned to be spherical morphology. It alsocan be seen that the diameters of samples A3 and A4 are substantially the same about450nm. However, the spherical morphology of A4 is more regular than that of A3. TheXRD patterns showed four reflection peaks attributed to (100), (110), (200) and (210),respec

12、tively, due to the hexagonal sructure.P12Then, we keep the same amount of ., increasing the amount of .Wefound that the length increased gradually. The XRDpatterns also showed thehexagonal sructure of samples B1, B2, B3, B4.P13Moreover, an additional proof of the hexagonal symmetry structure is give

13、n by TEM andthe FT pattern. The N2adsorption-desorption isotherms of the samples B1, B2, B3, B4exhibit a typical type-IV isotherm.According to the table of structural parameters, we can find that the specific surface areaand total pore volume increase gradually, the thickness of wall decrease and th

14、ere is noobvious change in diameter.P14Furthermore, the possible synthesis mechanism of the mesoporous silica nanotube in dualtemplates system was proposed. We suggest that due to electrostatic repulsion betweenpositively chargedammonium ions fromhydrated ammonia molecules and hydrophilic groups of

15、., especially in ammonia (NH3,25wt.%) solution, the high concentrated ammoniumions provide a crowded and repulsivespace to prevent the conjunction of . molecules, leading to the formation of the rod-likemicelles as template to form pore structure instead of sphere-like role of co-template . issugges

16、ted to tune the length of rod-like micelles by arranging itself along the axisof channel with PEO and PPO part immersed in the hydrophilic and the hydrophobic groupof CTA+respectively.As a result, the mesoporous nanotubewith different length will be synthesized. However, the non-polar .micelles are

17、not affected by positively charged ammonium. When the amount ofco-template increased further, the non-polar . micelles tend to control the morphology ofmicelles which are sequentially from nanotube, short rod to sphere-like ones. It my be thereason that the non-polar .micelles would provide stronger

18、 attractive force than the electrostaticrepulsion derived from the PEOblock, ammoniumions and head group of ., respectively.P15In order to investigate the influence of the morphology and structure ofmesoporous silica on catalytic performance, the samples with copper incorporated weresynthesized.P16T

19、he figure shows the SEM and TEM images of samples a1, a2, a3, from which we can seethey represent incremental length in the range of about , andum, and in sig ni fica nt cha nge in diameter around 100nm. In XRD patter ns,there are also four reflection peaks for the samples with copper incorprated, r

20、espectively,which indicates the incorporation of the inorganic copper salt has no obvious effect on thehexagonal sructure and the ordered degree of pore structure. Moreover, the trends inlength and the diameter of nanotube are illustrated.P17The N2adsorption-desorption isotherms of the samples a1, a

21、2, a3 exhibit a typical type-IVisotherm according to the IUPAC classification and no hysteresis loop at the relativepressure range ofp/po, implyingthesamples not only have ordered mesoporous structure but also the uniform pore size.Moreover, the pore diameters did not change significantly at different weight ratio of ./The most probable pore sizes of samplesa1, a2, a3 are determined to be , , nm, respectively. The structural parame