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We have demonstrated the applications of surfactant added TMAH for the formation of new shapes of MEMS components. The research is further extended for in-situ observation of the Si/(TMAH+surfactant) interface during the etching process using Fourier transform infrared microscopy (FT-IR) in the multiple internal reflection (MIR) geometry to detect the selective adsorption of the surfactant on different...
Natural zeolites are bioactive materials. They have different applications; they are used as additives in animal feeds to support biomass production and used to treat stomach ulcers incisions in humans as they act as buffers to reduce stomach acidity. Based on different health applications, structural stability of zeolite during digestion is important to understand possible interactions, positive...
Depending on the fact that most pillared clays show poor thermal stability, the study on the synthesis of novel Si-pillared montmorillonites (Si-MMT) with high thermal stability have been carried out. Furthermore, powder X-ray diffraction (XRD), Fourier transformation infra-red spectra (FTIR), nitrogen adsorption-desorption isotherms were applied in order to study the thermal stability and mechanisms...
This paper focuses on two aspects, macroscopic and microscopic, of pure and surfactant-added tetramethylammonium hydroxide (TMAH) wet etching. The macroscopic aspects deal with the technological/engineering applications of pure and surfactant-added TMAH for the fabrication of microelectromechanical systems (MEMS). The microscopic view is focused on the in situ observation of the silicon surface during...
To further enrich aluminum content in coal fly ash so as to reduce the cost of it as a resource for industrial aluminum extraction, a novel process was developed to separate silicon from the rest of fly ash. The process was conducted by treating the coal fly ash with high concentration sodium hydroxide solution to dissolve silicon as sodium silicate at room temperature under atmosphere. The sodium...
Summary form only given. Second harmonic generation (SHG) provides a surface-specific, noninvasive probe of adsorbates. However, microscopic first principles theory of adsorbate-specific spectroscopic SHG responses has proven elusive. We present experimental SHG spectra for six well-characterized, technologically important Si(001) surfaces in ultrahigh vacuum. Each adsorbate (combination) alters SHG...
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