Chinese Journal of Mechanical Engineering >

2018 , Vol. 31 >Issue 5: 84 - 84

DOI: https://doi.org/10.1186/s10033-018-0286-6

Intelligent Manufacturing Technology

Study of ss-DNA Adsorption and Nano-mechanical Properties on Mica Substrate with Surface Forces Apparatus

  • Gui-Bin Shen ,
  • Ya-Jing Kan ,
  • Min-Hua Chen ,
  • Yun-Fei Chen
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  • 1. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China;
    2. School of Mechanical Engineering, Southeast University, Nanjing 211189, China

收稿日期: 2016-08-08

  网络出版日期: 2019-07-23

基金资助

Supported by National Natural Science Foundation of China (Grant No. 51435003), and Jiangsu Provincial Natural Science Foundation of China (Grant No. BK20160670)

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Study of ss-DNA Adsorption and Nano-mechanical Properties on Mica Substrate with Surface Forces Apparatus

  • Gui-Bin Shen ,
  • Ya-Jing Kan ,
  • Min-Hua Chen ,
  • Yun-Fei Chen
Expand
  • 1. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China;
    2. School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Received date: 2016-08-08

  Online published: 2019-07-23

Supported by

Supported by National Natural Science Foundation of China (Grant No. 51435003), and Jiangsu Provincial Natural Science Foundation of China (Grant No. BK20160670)

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摘要

Many DNA-based devices need to build stable and controllable DNA films on surfaces. However, the most commonly used method of film characterization, namely, the probe-like microscopes which may destroy the sample and substrate. Surface Forces Apparatus (SFA) technique, specializing in surface interaction studies, is introduced to investigate the effects of DNA concentration on the formation of single-stranded DNA (ss-DNA) film. The result demonstrates that 50 ng/μL is the lowest concentration that ss-DNA construct a dense layer on mica. Besides, it is also indicated that at different DNA concentrations, ss-DNA exhibit diverse morphology: lying flat on surface at 50 ng/μL while forming bilayer or cross-link at 100 ng/μL, and these ss-DNA structures are stable enough due to the repeatability even under the load of 15 mN/m. At the same time, an obvious adhesion force is measured: -6.5 mN/m at 50 ng/μL and -5.3 mN/m at 100 ng/μL, respectively, which is attributed to the ion-correlation effect. Moreover, the atomic force microscopy (AFM) images reveal the entire surface is covered with wormlike ss-DNA and the measured surface roughness (1.8±0.2 nm) also matches well with the film thickness by SFA. The desorption behaviors of ss-DNA layer from mica surface occur by adding sodium salt into gap buffer, which is mainly ascribed to the decreased ion-ion correlation force. This paper employing SFA and AFM techniques to characterize the DNA film with flexibility and stable mechanical ability achieved by ion bridging method, is helpful to fabricate the DNA-based devices in nanoscale.

关键词： Single-stranded DNA; Adsorption; Nano-mechanical properties; Ion-correlation effect; Surface forces apparatus

本文引用格式

Gui-Bin Shen , Ya-Jing Kan , Min-Hua Chen , Yun-Fei Chen . Study of ss-DNA Adsorption and Nano-mechanical Properties on Mica Substrate with Surface Forces Apparatus[J]. Chinese Journal of Mechanical Engineering, 2018 , 31(5) : 84 -84 . DOI: 10.1186/s10033-018-0286-6

Abstract

Many DNA-based devices need to build stable and controllable DNA films on surfaces. However, the most commonly used method of film characterization, namely, the probe-like microscopes which may destroy the sample and substrate. Surface Forces Apparatus (SFA) technique, specializing in surface interaction studies, is introduced to investigate the effects of DNA concentration on the formation of single-stranded DNA (ss-DNA) film. The result demonstrates that 50 ng/μL is the lowest concentration that ss-DNA construct a dense layer on mica. Besides, it is also indicated that at different DNA concentrations, ss-DNA exhibit diverse morphology: lying flat on surface at 50 ng/μL while forming bilayer or cross-link at 100 ng/μL, and these ss-DNA structures are stable enough due to the repeatability even under the load of 15 mN/m. At the same time, an obvious adhesion force is measured: -6.5 mN/m at 50 ng/μL and -5.3 mN/m at 100 ng/μL, respectively, which is attributed to the ion-correlation effect. Moreover, the atomic force microscopy (AFM) images reveal the entire surface is covered with wormlike ss-DNA and the measured surface roughness (1.8±0.2 nm) also matches well with the film thickness by SFA. The desorption behaviors of ss-DNA layer from mica surface occur by adding sodium salt into gap buffer, which is mainly ascribed to the decreased ion-ion correlation force. This paper employing SFA and AFM techniques to characterize the DNA film with flexibility and stable mechanical ability achieved by ion bridging method, is helpful to fabricate the DNA-based devices in nanoscale.

Key words： Single-stranded DNA; Adsorption; Nano-mechanical properties; Ion-correlation effect; Surface forces apparatus

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