synthesis of colloidal photonic crystals

... Fabrication of colloidal crystals ………………… 15 2.1.2.2 Infiltration of the colloidal crystals ………………………… 22 2.1.2.3 Removal of colloidal particles ………………………………….23 2.2 The Incorporation of Engineered ... ………………………………………………… 2.1 Fabrication of Photonic Crystals ………………………………………… 2.1.1 The “top-down” approaches to 3D photonic crystals ………… ……9 2.1.2 Colloidal self-assembly approaches to photonic crystals ……… ……15 ... of colloidal spheres ………………………………………………….50 3.2.1 Synthesis of silica microspheres ………………………………………………… 50 ii Table of Contents 3.2.2 Synthesis of polystyrene microbeads ………………………………….51 3.3 Synthesis...

Ngày tải lên: 11/09/2015, 09:01

... analyses of the composition of the sample were performed in an EDX Protective Agent-Free Synthesis RESULTS AND DISCUSSION 3.1 Formation and Characterization of Colloidal Co Nanoparticles Colloidal ... Effect of N2H4 to Co2+ molar ratio on the mean particle size of colloidal Co nanoparticles; Co2+ = 40 mM, N2H4 = 1–10 M and (b) Effect of precursor concentration on the mean particle size of colloidal ... surface of the colloidal particles via the interaction of the hydroxyl group with the metal nuclei.12,20 Thus, no additional protective was needed to prevent the agglomeration of the synthesized colloidal...

Ngày tải lên: 07/08/2014, 14:20

Ngày tải lên: 13/11/2014, 09:29

... Numerical Simulations of Nanostructural Photonic Crystals List of Figures VI List of Figures Figure 1.1 Schematic pictures of one-, two- and three- dimensional photonic crystals (The materials ... memory Numerical Simulations of Nanostructural Photonic Crystals Chapter Introduction 1.3 Motivation The heart of the subject of photonic crystals is the propagation of electromagnetic waves in ... schematic pictures of one-, two- and three- dimensional photonic crystals are shown in Figure 1.1 Of particular interest is a complete photonic band gap (PBG) in the band structure of a photonic crystal,...

Ngày tải lên: 27/11/2015, 11:19

... COMMUNICATIONS Comparing the intensities of the (010) and (014) peaks of the sample with those of the bulk W18O49, it was found that the relative intensity of (010) has been dramatically increased ... reaction temperature of 250 °C (Figure 3a).19 Longer nanorods of 130 ( 30 nm in length (aspect ratio ≈ 20) were prepared at 270 °C by using 12 equiv of oleylamine instead of 16 equiv (Figure 3b).19 ... the intensity of this peak increases relative to that of UV emission as the length of nanorods increases A similar PL pattern with two emission maxima, yet at much lower energies of 2.8 and 2.3...

Ngày tải lên: 20/03/2014, 13:08

... John, D Joannopoulos, J.N Winn, R.D Meade, Photonic Crystals: Molding the Flow of Light (Princeton University Press, Princeton, 1995) C.M Soukoulis, Photonic Crystals and Light Localization in the ... correct physics and exhibits many of the observed and computed characteristics of 3D MPC which opens a band gap in the rage of visible frequencies [7, 29, 30] In many photonic band structure calculations ... optical switches and photonic devices [27, 28] In this paper, the effects of electronic QI on the absorption coefficient of QDs have been investigated for small and large concentration of the dopants...

Ngày tải lên: 22/06/2014, 00:20

... The FE-SEM image of copper oxalate showed particles in the size range of under 150 nm (Fig 2) Fig XRD pattern of copper oxalate Fig The FE-SEM image of copper oxalate Proceedings of IWNA 2011, November ... and (220) planes of fcc structure of copper (Fig 4) Fig X-ray diffraction PVP patterns of CuNPs- Characterized by TEM The TEM image of the 5th sample showed that the average size of copper nanoparticles ... 6,39 ± 1,51 Fig UV-vis Absorbance spectra of the copper colloidal solutions Characteristics of CuNPs Copper colloidal solutions were coating on the glass of microscopy by spin coating and baked...

Ngày tải lên: 02/08/2015, 13:21

... design of photonic crystals Convex optimization will be formally used for the purpose of designing photonic crystal devices with desired eigenband structures In particular, two types of devices ... Example of dispersion relation of a single-polarization single-mode photonic crystal fiber 106 5.2 Formulation II of the optimal design of SPSM PCF 115 5.3 Evolution of ... Introduction 1.1 1.1.1 Background Photonic crystals Photonic crystals will grant us the control of light When properly designed, these structures, comprised of periodically arranged electromagnetic...

Ngày tải lên: 10/09/2015, 15:49

... design of photonic crystals that support several band gaps These photonic crystals may prove useful for the suppression of resonance at harmonic frequencies, as they prohibit the propagation of electromagnetic ... usefulness of such a computational scheme based on conic (semidefinite) convex optimization to design photonic crystals with multiple and complete band gaps in two types of lattices These photonic ... from existing photonic crystal designs [33, 50, 44] with a single band gap In particular, we observe from our results that unlike optimal photonic crystals discovered in [50], photonic crystals with...

Ngày tải lên: 10/09/2015, 15:52

... cases of the optimal design of photonic crystals, the following directions are of great interest for the further development of this field Band gap optimization of three-dimensional photonic crystals ... account in the design of the photonic crystals To solve the three-dimensional Maxwell’s equations, not only will the degrees of freedom of the system increase, but also the number of decision variables ... well as extensions to a wider range of applications will be provided in the end 6.1 Summary The optimal design of photonic crystals has been the central theme of this work The aim is to develop...

Ngày tải lên: 10/09/2015, 15:53

... propagation constant β Figure 5.1: Example of dispersion relation of a three-dimensional photonic crystal fiber The inset illustrates an example of the cross section of the waveguide βL and βR are the ... a uniform grid of mesh size a/40, and the super cell domain Ωs is decomposed into a uniform grid of the same mesh size, but of more elements The cladding consists of two rings of Ω surrounding ... has cylinders of material background of material holes of material material H L H; L of radius 0.485a L in the while the periodic cladding in the rhombic lattice has elliptical of major axis...

Ngày tải lên: 10/09/2015, 15:53

Ngày tải lên: 10/09/2015, 15:53

... PHOTONIC CRYSTALS —A STUDY OF THE MICROSTRUCTURE DESIGNS AND PARAMETRIC PROCESSES GUO HONGCHEN (BS, Shandong University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF ... number of wavelengths conversion Summary References Chapter DIFFRACTION MODEL OF PARAMETRIC PROCESS IN NONLINEAR PHOTONIC CRYSTALS -6- 5.1 Introduction 5.2 The photonic diffraction model 5.3 Photonic ... reexplain the quasi-phased-matched parametric process in nonlinear photonic crystals from the point of view of light diffraction in real crystals It is shown that the quasi-phase-matching condition...

Ngày tải lên: 14/09/2015, 13:11

... characterization of colloidal crystals as three-dimensional photonic crystals The effects of surfactants on the structure of polystyrene colloidal crystals and the effects of pre-heating treatment on the photonic ... Photonic Crystals 2.1 Introduction………………………………………………………… 27 2.2 Fabrication of Colloidal Crystals ………………………… .29 2.3 2.2.1 Fabrication of Colloidal Crystals by Sedimentation 2.2.2 Fabrication of Colloidal ... number of layers of colloidal 35 crystals was increased with increasing the concentration of suspension within the limitation of 10% by weight 2.3 Optical Characterization of Colloidal Crystals...

Ngày tải lên: 05/10/2015, 22:32

... the range of the coercive field of lithium niobate of 20.6 kV/mm Nonlinear Photonic Crystals for Frequency Conversion of Infrared Light 38 Chapter Fabrication of Nonlinear Photonic Crystals FIG ... inhibition of spontaneous emission of light These are, nevertheless two facets of one central theme: confining the flow of electromagnetic waves So what are photonic crystals? Photonic crystals ... question of why is there a need for this kind of nonlinear photonic crystals which is the motivation behind our work Our utilization of nonlinear photonic crystals is to resolve the problem of phase...

Ngày tải lên: 26/11/2015, 23:07

... referenced Because of the size of the capital investment, the similarity of need, the rate of change in information technology, and the proliferation of vendors, the creation of a public framework ... Investigators responsible for the conduct of the synthesis were Sally D Liff, Manager, Synthesis Studies, and Donna L Vlasak, Senior Program Officer This synthesis was edited by Linda S Mason Valuable ... responsibility and oversight This type of model has led to the emergence of pockets of MIS resources outside of the primary computing environment Lack of training and funding are two critical...

Ngày tải lên: 18/02/2014, 11:20

... Amidation of C-terminus Sulfation of tyrosine Hydroxylation of proline Carboxylation of glutamic acid Cyclization of N-terminal Gln O-Glycosylation Bromination of tryptophan Isomerization of tryptophan ... mechanisms of incorporation of PTMs in the biosynthesis of conopeptides Appropriate methods of analysis need to be addressed to ensure recognition of these PTMs, if present, in the course of characterization ... applications for synthesis of cholecystokinin-12 and bradykinin containing tyrosine sulfate [57], and could perhaps be applicable to synthesis of a-conopeptides Synthesis of variants of a-conotoxins:...

Ngày tải lên: 19/02/2014, 12:20

Ngày tải lên: 19/02/2014, 15:20

... transition of the Eadie– Hofstee plot from the biphasic to a monophasic shape are Table Rates of inactivation of IICBGlc Incubation of purified IICBGlc with the indicated concentration (mM) of the ... consumption of NADH in the presence of L-lactate dehydrogenase, but also formation of NADPH in the presence of Glc6P dehydrogenase This background activity must therefore be due to phosphorylation of ... Reversible inhibition of EIIGlc Eadie–Hofstee plots of nonvectorial phosphorylation of D-Glc (0–2 mM) by membrane fractions containing EIIGlc Phosphorylation was assayed in the presence of inhibitors...

Ngày tải lên: 21/02/2014, 01:21

... methods Relative activity of GpnGs as effectors of the synthesis of poly(A) Based on the above results, the effect of several diguanosine polyphosphates on the synthesis of poly(A) was comparatively ... independent synthesis of poly(A) In order to understand why dinucleoside polyphosphates activated the primer independent synthesis of poly(A), the effect of 0.01 mM Gp4G or Ap4A on the synthesis of poly(A) ... presence of 0.02 mM [a-32P]ATP While confirming the adenylylation of these compounds and the absence of synthesis of poly(A) by the E coli poly(A) polymerase, we did not observed adenylylation of guanosine,...

Ngày tải lên: 21/02/2014, 01:21