国际会议口头报告ppt演讲内容准备模板

The Draft of Academic Presentation 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 开场白开场白 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 silica nanotube functioned with heteroatoms I shall only take ten minutes of your time I will talk about the topic on the preparation of porous materials P2 First of all i wanna introduce myself I come from nanjing university of technology nanjing city china P3 The content is listed as follows P4 All our researches are conducted 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 more the possible synthesis mechanisms are also investigated Today the presentation is based on the right hand branch P5 It is known that mesoporous silica have excellent characters as the catalyst carrier such as But due to lack of active sites we have to introduce organic or inorganic species as active sites And the catalytic performance need to be further improved P6 As 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 of scale factor on the catalysis P7 Due 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 P8 Though 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 exploring a proper condition at which the silicon and metal sources can simultaneously hydrolyze can ensure a desired material P9 Next let s look at the synthetic steps Firstly Then After that At last we obtained the products P10 In this work by changing the synthesis conditions such as and 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 P11 the SEM images of samples A1 A2 A3 are shown in the figure It can be seen that sample a1 is nanowire like with length of about 2 m and 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 m in length and 400nm in diameter respectively With further increasing 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 attributed to 100 110 200 and 210 respectively due to the hexagonal sructure P12 Then 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 P13 Moreover an additional 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 increase gradually the thickness of wall decrease and there is no obvious change in diameter P14 Furthermore 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 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 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 with 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 like 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 P15 In order to investigate the influence of the morphology and structure of mesoporous silica on catalytic performance the samples with copper incorporated were synthesized P16 The figure shows the SEM and TEM images of samples a1 a2 a3 from which we can see they represent incremental length in the range of about 0 5 1 0 and 1 5 m and insignificant change in diameter around 100nm 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 and the diameter of nanotube are illustrated P17 The 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 p p0 0 4 implying the samples 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 samples a1 a2 a3 are determined to be 2 71 2 50 2 44 nm respectively The structural parameters ar