写作从点滴开始——SCI论文中如何描述物理吸脱附实验结果？
前言：
有关物理吸脱附实验的基础知识，我们在前面已经进行了简单的介绍（请进入“科研资料”-->“基础知识”分栏进行查看），还有部分内容和实验直接相关，过些日子也会推出，敬请期待。而关于论文写作这个方面，在未来很长的一段时间内，我们会做的一件事情是将一些优秀论文中描述各类实验结果的语句作为模板分享给大家。如上次我们在论文写作三境界中所说：唯有积累足够了之后，写作才能不依赖于文献，最终达到用语言传递思想的境界。其实，早前我们已经分享了一些关于XRD，SEM，TEM结果描述的内容，详情可以进入“科研资料”-->"论文写作"分栏进行查看。
今天，我们主要分享物体吸脱附实验结果的具体描述。
1. 如何非常详细地描述N2吸脱附实验的整个实验结果？
举例：Brunauer–Emmett–Teller (BET) gas sorptometry measurements were conducted to examine the porous nature of the ZnS NPNPs. Figure 3 shows the N2 adsorption/desorption isotherm and the pore-size distribution (inset) of ZnS NPNPs. The isotherms are identified as type IV, which is characteristic ofmesoporous materials. The pore-size distribution obtained from the isotherm indicates a number of pores less than 5 nm in the sample. These pores presumably arise from the spaces among the small nanocrystallites within a ZnS NPNP.The large pores of around 30 nm are attributed to the interparticle spaces. The sharp distribution of the mesopores around 30 nm suggests that the NPNPs have high monodispersity. The BET specific surface area of the sample was calculated from N2 isotherms at -196.6 oC, and was found to be as much as about 156.1 m2 g-1.The single-point total volume of pores at P/P0= 0.9926 was 0.59 cm-3 g-1.The extremely high BET surface area and large total pore volume strongly support the fact that the nanoparticles have an anoporous structure.
参考文献：Hu, J. S. et al., Angew. Chem. 2005, 117, 1295 –1299.
简要分析：之所以摘选这一段，因为它代表了典型的Results and Discussion的写法，同时涵盖了N2吸脱附实验结果的绝大部分内容。
A. Results and Discussion最标准的写法（可以灵活运用，这里仅代表最基础的写法）:为什么做这个实验（或表征）？如何来做这个实验（一般移到Experiment section）？得到了什么信息？说明了什么问题？与哪些结果吻合？
B. 提炼语言模板：
为什么做这个表征: Brunauer–Emmett–Teller (BET) gas sorptometry measurements were conducted to examine the porous nature of the 材料名称. Figure __ shows the N2 adsorption/desorption isotherm and the pore-size distribution (inset) of ____.
得到了哪些信息，说明了哪些问题: The isotherms are identified as type __, which is characteristic of mesoporous materials. The pore-size distribution obtained from the isotherm indicates a number of pores 孔径尺寸 in the sample. These pores presumably arise from 孔产生的原因. The large pores of around 孔径尺寸 are attributed to 产生的原因.The sharp distribution of the mesopores 孔径尺寸 suggests that ___ have high monodispersity. The BET specific surface area of the sample was calculated from N2 isotherms at -196.6 oC, and was found to be as much as about __ m2 g-1. The single-point total volume of pores at P/P0 = __ was __ cm-3 g-1.
从这些信息可以推测出什么，与哪些结果吻合：The extremely high BETsurface area and large total pore volume strongly support the fact that ____,which is in good accordance with 某个表征结果.
C. N2吸脱附实验有哪些内容可以描述：吸附等温线类型；孔径分布；比表面积；孔容等。
2.不同文章中描写N2吸脱附实验可能详略不一，下面总结一些比较常见的写法供大家参考。
A. 描写孔径分布（蓝色标记部分即为模板）：
1. Barrett-Joyner-Halenda (BJH) analyses show that the calcined TiO2 and WO3 exhibit pore sizes of 65 and 50 Å, respectively. The pore sizes (50 ± 140 Å) of the mesoporous metal oxides listed in Table 1 are substantially larger than anyof the non-silica mesoporous oxides previously reported. (Yang, P. D. et al. Nature,1998, 396, 152)
2. Using the BJH method and the desorption branch of the nitrogenisotherm, the calculated pore-size distribution indicates that the material contains an average pore size of 39 nm, with the smaller mesopores in the order of 21 nm. Pores of various sizes and shapes were observed in the TEM image, in accordance withthese stochastic calculation results. (Jing,Z. H. et al. Adv. Mater. 2008, 20, 4547–4551)
3. The pore size distribution, derived from desorption data and calculated from the isotherm using the BJH model , shows that most of the pores fall into the size range of 2 to 10 nm and the average pore size is calculated to be 6 nm, which is coincident with the measured results of the high resolution TEM image. (Tang, Y. P.et al. Energy Environ. Sci., 2013, 6, 2447-2451)
B. 描述吸附等温线和回滞环
1. Large hysteresis loops with shapes that are intermediate between typical H1- and H2-type isotherms are observed for these mesoporous metal oxides. Such strong hysteresis is believed to be related to the capillary condensation associated with large pore channels but may also be due to modulation of the channel structure. (Yang, P. D.et al. Nature, 1998, 396, 152)
2. The N2 isotherm corresponds to a type III isotherm in the Brunauer classification. The characteristic feature of these curves is their hysteresis loop, which does not exhibitany limiting adsorption at high relative pressures. According to the IUPAC classification, the loop observed is ascribed to type H3 loops, indicating the presence of mesopores in the material. (Jing, Z. H. et al. Adv. Mater. 2008, 20, 4547–4551)
3. The N2 adsorption/desorption isotherms exhibited a type IV isotherm with a hysteresisloop, demonstrating their mesoporous characteristics.The pore size calculated using the BJH method was 3.5 nm. (Kim,J. et al.; J. Am. Chem. Soc. 2006, 128, 688-689)
4.The N2 adsorption isotherm of ZSM-5 basically belongs to IUPAC type I, as indicated by the literature.The predominant adsorption finishes below P/P0= 0.02, which is a characteristic of uniform microporous solids. The N2 adsorption isotherm of meso-ZSM-5, as expected to have a much larger adsorption amount than that of ZSM-5, has a steep uptake below P/P0 = 0.02 and a hysteresis loop above P/P0 = 0.6. Thus, the co-presence of micropores and mesopores is suggested by the N2 adsorption isotherm.(Tao, Y. S. etal.; J. Am. Chem. Soc. 2003, 125, 6044-6045)
C. 描述比表面积
1.The BET surface area of the __ was calculated to be__ m2 g-1.
2. SPE analysis and the Dollimore Heal (DH) method of the N2 adsorption isotherm showed that the surface area was 1330 m2 g-1, mesopore volume was 3.15 cm3 g-1, (the micropore volume was 0.19 cm3 g-1), and mesoporesize was 23 nm. (Tao, Y. S. et al.; J. Am. Chem. Soc. 2003, 125,6044-6045)
3. As shown in Fig. 5, the prepared sample exhibits a surface area of 26.8 m2 g-1 and a pore volume of 0.12 cm3 g-1. (Tang, Y. P.et al. , 2013, 6, 2447-2451)
D. 有列表时可以简略描述
Fig. 2 illustrates the N2 adsorption–desorption isotherms and BJH pore size distribution plots (insert) determined from the adsorption branch of the N2 isotherms for the calcined silicas and carbon replicas. The values of the BET surface area, total pore volume, pore diameter, and wall thickness are listed in Table 1. (Kim, S. S. et al.;Chem. Commun.,2001, 2418–2419)
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