Low‐dielectric‐constant (low‐κ) materials are a critical requirement for future generations of computer microprocessors. As a unique class of porous silicas, pure silica zeolites (PSZs) have been shown to be a promising low‐κ material with excellent mechanical strength (e.g., elastic modulus of 16–18 GPa) due to their crystalline nature. In the present study, we show for the first time that higher crystallinity of spin‐on PSZ MFI films leads to lower κ values and less moisture sensitivity—two critical properties of a porous low‐κ material. We have also advanced the two‐stage synthesis method to produce zeolite nanoparticles with high yield (77 %) and a small diameter (< 80 nm). A κ value of 1.6 is obtained from the silylated highly crystalline PSZ MFI film and the κ value only increases by 12.5 % after exposure to ambient conditions for a period of 24 h.
By using carboxy methyl chitosan (CMCS) and gelatin (Gel) as adhesive, the nano–HA slurry which was fabricated via a precipitation process as the raw material, dense HA spheres with a uniform size distribution and good geometry were prepared successfully by means of Sol-Gel method. Dense HA spheres with a porosity of 4.7%±0.6% have a higher compressive strength (8.9±0.4) MPa than that of porous HA spheres (7.9±0.2) MPa with a porosity of 16.4%±0.5% (particles with diameter of 0.5 mm). The results of biomimetic mineralization and cell culture show that dense HA spheres have an excellent biological property
In order to fabricate translucent hydroxyapatite ceramics with different forms, using micro-sized HA powders as the raw material and chitin as adhesive, the ceramic green was prepared by Sol-Gel method. Subsequently, pure HA ceramics were obtained by normal pressure sintering. Translucent HA ceramics were then fabricated via hot isostatic pressing (HIP) sintering. The Sol-Gel method is easy to obtain shaped ceramic products. The so-produced HA ceramic spheres with a good sphericity and the HA ceramic fibers with a high aspect ratio have the density of 99.1% and the average grain size of 2.2 μm. Compressive strength of translucent HA ceramic spheres is 10.2 MPa whith It is higher than that of conventionally-sintered dense and porous HA ceramic spheres (8.9 and 4.7 MPa, respectively). Results of biomimetic mineralization and cell culture show that translucent HA ceramics have good biocompatibility
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