A New Probe: AFM Measurements for Random Disorder Systems

doi:10.1088/0256-307X/36/1/010501

Chin. Phys. Lett.

2019, Vol. 36

Issue (1): 010501 DOI: 10.1088/0256-307X/36/1/010501

GENERAL

A New Probe: AFM Measurements for Random Disorder Systems

R. Salci¹, D. A. Acar¹, O. Oztirpan¹, M. Ramazanoglu^1,2**

¹Physics Engineering Department, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
²Brockhouse Institute for Materials Research, Hamilton, ON L8S 4M1 Canada

Cite this article:

R. Salci, D. A. Acar, O. Oztirpan et al 2019 Chin. Phys. Lett. 36 010501

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Abstract We study the quenched random disorder (QRD) effects created by aerosil dispersion in the octylcyanobiphenyl (8CB) liquid crystal (LC) using atomic force microscopy technique. Gelation process in the 8CB+aerosil gels yields a QRD network which also changes the surface topography. By increasing the aerosil concentration, the original smooth pattern of LC sample surfaces is suppressed by the emergence of a fractal aerosil surface effect and these surfaces become more porous, rougher and they have more and larger crevices. The dispersed aerosil also serves as pinning centers for the liquid crystal molecules. It is observed that via the diffusion-limited-aggregation process, aerosil nano-particles yield a fractal-like surface pattern for the less disordered samples. As the aerosil dispersion increases, the surface can be described by more aggregated regions, which also introduces more roughness. Using this fact, we show that there is a net correlation between the short-range ordered x-ray peak widths (the results of previous x-ray diffraction experiments) and the calculated surface roughness. In other words, we show that these QRD gels can also be characterized by their surface roughness values.

Received: 03 September 2018 Published: 25 December 2018

PACS:	05.40.-a	(Fluctuation phenomena, random processes, noise, and Brownian motion)
	61.30.Vx	(Polymer liquid crystals)
	61.30.Hn	(Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions)
	61.43.-j	(Disordered solids)
	68.37.Ps	(Atomic force microscopy (AFM))

Fund: Supported by TUBITAK under Grant No 115F315.

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https://cpl.iphy.ac.cn/10.1088/0256-307X/36/1/010501 OR https://cpl.iphy.ac.cn/Y2019/V36/I1/010501

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	R. Salci
	D. A. Acar
	O. Oztirpan
	M. Ramazanoglu

[1]	Zhou B et al 1997 Liq. Cryst. 22 335
[2]	Haga H and Garland C W 1997 Phys. Rev. E 56 3044
[3]	Iannacchione G S et al 1998 Phys. Rev. E 58 5966
[4]	Bellini T et al 2000 Phys. Rev. Lett. 85 1008
[5]	Park S et al 2002 Phys. Rev. E 65 050703 (R)
[6]	Leheny R L et al 2003 Phys. Rev. E 67 011708
[7]	Frinton Lab, Vienland, NJ 08360
[8]	Evonik (Degussa) Corp., Tuzla, Istanbul, TR 34490
[9]	Ramazanoglu M et al 2007 Phys. Rev. E 75 061705
[10]	Ramazanoglu M et al 2004 Phys. Rev. E 69 061706
[11]	Ramazanoglu M et al 2008 Phys. Rev. E 77 031702
[12]	Freelon B et al 2011 Phys. Rev. E 84 031705
[13]	A scanning probe microscopy made by nanomagnetics was used with tapping and non-contact mode. The AFM probe tapping frequencies were $\sim$161 kHz for these scans.
[14]	Raposo M et al 2007 Modern Research and Educational Topics in Microscopy (Badajoz, Spain: Formatex Press) p 758
[15]	Iannacchione G S et al 2003 Phys. Rev. E 67 011709
[16]	Parvinzadeh M et al 2010 Appl. Surf. Sci. 256 2792
[17]	Buscarino G et al 2011 J. Non-Cryst. Solids 357 1866
[18]	Clegg P S et al 2003 Phys. Rev. E 67 021703
[19]	Garland C W and Nounesis G 1994 Phys. Rev. E 49 2964

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