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首页> 外文期刊>RSC Advances >Cellulose nanofibrils prepared by gentle drying methods reveal the limits of helium ion microscopy imaging
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Cellulose nanofibrils prepared by gentle drying methods reveal the limits of helium ion microscopy imaging

机译：通过温和干燥方法制备的纤维素纳米纤维揭示了氦离子显微镜显微镜的限制

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TEMPO-oxidized cellulose nanofibrils (TCNFs) have unique properties, which can be utilised in many application fields from printed electronics to packaging. Visual characterisation of TCNFs has been commonly performed using Scanning Electron Microscopy (SEM). However, a novel imaging technique, Helium Ion Microscopy (HIM), offers benefits over SEM, including higher resolution and the possibility of imaging non-conductive samples uncoated. HIM has not been widely utilized so far, and in this study the capability of HIM for imaging of TCNFs was evaluated. Freeze drying and critical point drying (CPD) techniques were applied to preserve the open fibril structure of the gel-like TCNFs. Both drying methods worked well, but CPD performed better resulting in the specific surface area of 386 m(2) g(-1) when compared to 172 m(2) g(-1) and 42 m(2) g(-1) of freeze dried samples frozen in propane and nitrogen, respectively. HIM imaging of TCNFs was successful but high magnification imaging was challenging because the ion beam tended to degrade the TCNFs. The effect of the imaging parameters on the degradation was studied and an ion dose as low as 0.9 ion per nm(2) was required to prevent the damage. This study points out the differences between the gentle drying methods of TCNFs and demonstrates beam damage during imaging like none previously reported with HIM. The results can be utilized in future studies of cellulose or other biological materials as there is a growing interest for both the HIM technique and bio-based materials.
机译：氧化纤维化纤维素纳米纤维（TCNF）具有独特的性质，可在许多从印刷电子设备到包装的应用领域中使用。使用扫描电子显微镜（SEM）通常进行TCNF的视觉表征。然而，一种新型的成像技术，氦离子显微镜（HIM），提供过SEM的益处，包括更高的分辨率和成像未涂覆的非导电样品的可能性。到目前为止，他尚未被广泛利用，在这项研究中，他评估了他对TCNF的成像的能力。冻干和临界点干燥（CPD）技术被应用于保持凝胶样TCNF的开放式原纤维结构。两种干燥方法都良好工作，但与172μm（2）g（-1）和42μm（2）g相比，CPD效果更好地导致386μm（2 )g（-1）的比表面积为386μm（2）g（-1）（2）g（-1 ）分别在丙烷和氮气中冷冻的冷冻干燥样品。他对TCNF的成像是成功的，但高放大率成像是挑战性的，因为离子束倾向于降解TCNF。研究了成像参数对劣化的影响，需要每NM（2）的低至0.9离子的离子剂量以防止损伤。本研究指出了TCNF的温和干燥方法之间的差异，并在成像期间表现出梁损伤，如以前与他一起报告。结果可以在未来的纤维素或其他生物材料的研究中使用，因为他对他的技术和基于生物的材料都有日益增长的感兴趣。

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  • 来源
    《RSC Advances》 |2019年第27期|共10页
  • 作者

    Ketola Annika E.; Leppanen Miika; Turpeinen Tuomas; Papponen Petri; Strand Anders; Sundberg Anna; Arstila Kai; Retulainen Elias;

  • 作者单位

    VTT Tech Res Ctr Finland Ltd POB 1603 FI-40101 Jyvaskyla Finland;

    Univ Jyvaskyla Nanosci Ctr Dept Phys FI-40014 Jyvaskyla Finland;

    VTT Tech Res Ctr Finland Ltd POB 1603 FI-40101 Jyvaskyla Finland;

    Univ Jyvaskyla Nanosci Ctr Dept Phys FI-40014 Jyvaskyla Finland;

    Abo Akad Univ Johan Gadolin Proc Chem Ctr Porthansgatan 3 FI-20500 Turku Finland;

    Abo Akad Univ Johan Gadolin Proc Chem Ctr Porthansgatan 3 FI-20500 Turku Finland;

    Univ Jyvaskyla Nanosci Ctr Dept Phys FI-40014 Jyvaskyla Finland;

    VTT Tech Res Ctr Finland Ltd POB 1603 FI-40101 Jyvaskyla Finland;

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  • 中图分类 化学;
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