SCI論文中如何描述物理吸脫附實驗結果？

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前言：

關於論文寫作這個方面，在未來很長的一段時間內，我們會做的一件事情是將一些優秀論文中描述各類實驗結果的語句作為模板分享給大家。如上次我們在論文寫作三境界中所說：唯有積累足夠了之後，寫作才能不依賴於文獻，最終達到用語言傳遞思想的境界。

今天，我們主要分享物體吸脫附實驗結果的具體描述。

1. 如何非常詳細地描述N2吸脫附實驗的整個實驗結果？

舉例：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.

參考文獻：Hu, J. S. et al., Angew. Chem. 2005, 117, 1295 –1299.

簡要分析：之所以摘選這一段，因為它代表了典型的Results and Discussion的寫法，同時涵蓋了N2吸脫附實驗結果的絕大部分內容。

A. Results and Discussion最標準的寫法（可以靈活運用，這裡僅代表最基礎的寫法）:為什麼做這個實驗（或表徵）？如何來做這個實驗（一般移到Experiment section）？得到了什麼信息？說明了什麼問題？與哪些結果吻合？

B. 提煉語言模板：

為什麼做這個表徵: Brunauer–Emmett–Teller (BET) gas sorptometry measurements were conducted to examine the porous nature of the 材料名稱. Figure __ shows the N2 adsorption/desorption isotherm and the pore-size distribution (inset) of ____.

得到了哪些信息，說明了哪些問題: 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 孔徑尺寸 in the sample. These pores presumably arise from 孔產生的原因. The large pores of around 孔徑尺寸 are attributed to 產生的原因.The sharp distribution of the mesopores 孔徑尺寸 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.

從這些信息可以推測出什麼，與哪些結果吻合：The extremely high BETsurface area and large total pore volume strongly support the fact that ____,which is in good accordance with 某個表徵結果.

C. N2吸脫附實驗有哪些內容可以描述：吸附等溫線類型；孔徑分布；比表面積；孔容等。

2.不同文章中描寫N2吸脫附實驗可能詳略不一，下面總結一些比較常見的寫法供大家參考。

A. 描寫孔徑分布：

1. Barrett-Joyner-Halenda (BJH) analyses show that the calcined TiO2 and WO3 exhibit pore sizes of 65 and 50 ?, respectively. The pore sizes (50 ± 140 ?) 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. 描述吸附等溫線和回滯環

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. 描述比表面積

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. Energy Environ. Sci., 2013, 6, 2447-2451)

D. 有列表時可以簡略描述

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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