High Refractive Index Silicone

School of Material and Mineral Resources, Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia 

Keywords Silicone, polysiloxane, refractive index, Lorentz-Lorenz equation, polarizability, free volume, dielectric constant 

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Recent examples that have utilized the hydrosilylation reaction to prepare very imique organosiloxanes are shown in equations 4 and 5. Equation 4 depicts the hydrosilylation of phenylacetylene to provide beta-vinyl silicones (84,85) and is a convenient route to high refractive index silicones. 

Chemical modification of the wax can improve smear resistance (5). Silicones, which do not harm furniture finishes (6), are incorporated as film-forming ingredients in furniture polishes. The lubricant properties of silicones improve ease of application of the polish and removal of insoluble soil particles. In addition, silicones make dry films easier to buff and more water-repellent, and provide depth of gloss, ie, ability to reflect a coherent image as a result of a high refractive index (7). Wax-free polishes, which have silicones as the only film former, can be formulated to deliver smear resistance (8). Another type of film former commonly used in oil-base furniture polishes is a mineral or vegetable oil, eg, linseed oil. 

Current production of solar cells is dominated by crystalline silicon modules however, due to the high refractive index of silicon, more than 30 percent of incident light is reflected back, which greatly reduces the conversion effi-... 

The R1 values obtained for such phenylethynyl substituted siloxanes are higher then that reported for traditional aromatic-based systems [9] or the phenol modified ones (1.50-1.53) [10]. The synthesis of high refractive index (methyl)(diphenyle thenyl)-dichlorosilane via hydrosilylation was also described [1]. Such monomer was later hydrolyzed and condensed into silicone fluid. Similar process was also presented, applying silylative coupling process in the synthesis of an analogous (methyl)(phenylethenyl)diethoxysilane [11], so the two reactions shall be discussed in the following section. 

Silicon Si 3.42 1.1-6.7 30-FlR Very hard, high refractive index... 

The sample is placed in contact with the internal reflection element, the light is totally reflected, and the sample interacts with the evanescent wave resulting in the absorption of radiation by the sample. The internal reflection element is made from a material with a high refractive index, e.g., zinc selenide (ZnSe) or silicon (Si). 

Uke germanium, siHcon also has a fairly high refractive index (n= 3.4). Silicon is rarely used for the fabrication of large IREs (for which the optical path may be... 

Here we focus on the capabilities of a porous silicon waveguide biosensor for the detection of small molecules. The porous silicon waveguide, shown schematically in Figure 3a, consists of two porous silicon layers. Light is trapped in the top, high refractive index layer, based on total internal reflection at the interfaces with air and the bottom, low refractive index porous silicon... 

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