نتایج جستجو برای: micro silica
تعداد نتایج: 151315 فیلتر نتایج به سال:
We report laser micro-fabrication of photonic crystal structures in silica glass and photopolymerizing resins, and present a detailed analysis of their structural and optical properties. Photonic crystals with 2D triangular lattice and 3D diamond lattice in glass are found to exhibit moderately pronounced photonic pseudogaps. Formation of planar microcavity is demonstrated in log-pile 3D photon...
Silaffins are involved in the formation of the cell walls of diatoms. It is known that silaffins can precipitate silica in vitro, forming nano- and micro-particles in the shape of spheres and plates containing many pores. It is important to note that the deposition of silica and the particle morphology in the presence of silaffins affects chemical and physical agents (e.g., peptides, polyamines...
Recent advances in the development of photonic switching and transmission systems that exploit high and low index contrast integration materials are reported. Micro-ring resonators, delayed interferometers and alloptical wavelength converters integrated in Si3N4-SiO2 and silica-on-silicon substrates are used for the regeneration and wavelength routing of amplitude and phase modulated optical si...
The fabrication of micro-resonators, made from porous silica ridge waveguides by using an electrochemical etching method of silicon substrate followed by thermal oxidation and then by a standard photolithography process, is reported. The design and fabrication process are described including a study of waveguide dimensions that provide single mode propagation and calculation of the coupling rat...
Numerous living organisms form minerals. These biogenic minerals, or biominerals, are composite materials containing an organic matrix and nanoor micro-scale amorphous or crystalline minerals. In this chapter we will review the molecular aspects of biomineralization and describe as completely as is currently possible the organic-mineral interface, the location in which organic-mineral interacti...
Correspondence: Viara Ivanova University of Food Technologies – Plovdiv, Department of Microbiology, 26 Maritsa Blvd., 4002 Plovdiv, Bulgaria. Tel.: +359 32 603622 e-mail: [email protected] ABSTRACT Recombinant cyclodextrin glucanotransferase JCGT8-5 (CGTase, EC 2.4.1.19) was effectively immobilized by formation of chemical bounds on polyethylenimine (PEI)-activated silica particles, on silaniz...
Microencapsulation has become a hot topic in chemical research. Technology mainly used for control release and protection purposes. The sol-gel micro encapsulation approach for fragrance and aroma in porous silica-based materials leads to sustainable odorant and flavored materials with novel and unique beneficial properties. Sol-gel encapsulation of silica based micro particles considered econo...
Porous solids have an important role in addressing some of the major energy-related problems facing society. Here we describe a porous solid, α-MnO2, with a hierarchical tetramodal pore size distribution spanning the micro-, meso- and macro pore range, centred at 0.48, 4.0, 18 and 70 nm. The hierarchical tetramodal structure is generated by the presence of potassium ions in the precursor solut...
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