1. UKM Learning and Research Repository
2. Master Thesis / Tesis Master
3. Institute of Microengineering and Nanoelectronics / Institut Kejuruteraan Mikro dan Nanoelektronik (IMEN)

Title:	Biomimetics of nanostructures concerning structural colours
Authors:	Tina Rezaie Matin (P51675)
Supervisor:	Ille C. Gebeshuber, Prof. Dr.
Keywords:	Biomimetics Nanostructures Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	30-Jul-2011
Description:	Biomimetics deals with the knowledge transfer from biology to technology. The biomimetic approach is especially interesting concerning structural colours. Structural colours are shiny - sometimes metallic - colours that are caused by physical phenomena due to the interaction between visible light and nanostructures. Optical engineers have been dealing with difficult and expensive fabrication processes for optical filters and reflectors via vacuum deposition and sets of sophisticated equipments for years. In contrast, biological systems cheaply and efficiently produce spectacular filters in butterflies, moths, beetles, birds and fishes. Regarding multiple optical functionality of these creations, scientists in this field are spending more attention to study and emulate natural mechanisms. In this thesis, a new method called omni-gradient-analysis (OGA) to investigate structural colours is developed, a computer program visualizing the data obtained by OGA is introduced and various biological samples with structural colours are investigated using a multitude of microscopy methods. The omni-gradient-analysis method is a novel method we propose to characterize angle- and intensity-dependency of colours. As opposed to currently used methods, the characteristics of the colours can easily be grasped with one glance at the resulting viewgraph. An OGA setup that comprises a calibrated light source, optical fibres, a turntable, a spectrometer, two arcs to change azimuthal and polar angles and computer equipment to store and display the data was designed and first results were acquired by the prototype of the test setup. The computer program written with MATLAB software reads in the data from the spectrometer and visualizes the giant data matrix in a simple viewgraph. Various biological samples are investigated regarding their structural colours. The iridescent wing of a Malaysian carpenter bee (genus Xylocopa in the subfamily Xylocopinae.) is described in detail regarding its structural colour for the first time. Measurements on this special species unfolded brain-like structures in the dimension of 100-200 nm in different parts of the surface layer. The multilayer structure consists of 20 layers with thickness of 300 nm each at the cross section of the wing. Microscopy methods to investigate these samples are optical microscopy, conventional scanning electron microscopy, field emission scanning electron microscopy, environmental scanning electron microscopy and atomic force microscopy. The omni-gradient-analysis setup, the computer program and the accumulated expertise in structural colours at the Institute of Microengineering and Nanoelectronics at Universiti Kebangsaan Malaysia are a sound basis for producing structural colours with conventional MEMS fabrication methods.,Certification of Master's / Doctoral Thesis" is not available
Pages:	141
Call Number:	QP517.B56M347 2011 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Institute of Microengineering and Nanoelectronics / Institut Kejuruteraan Mikro dan Nanoelektronik (IMEN)

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.