4results about How to "Controllable shape" patented technology

The invention relates to a titanium silicalite molecular sieve, a preparation method thereof and a method for preparing epoxypropane, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first main binder, water, an optional first binder and an optional first surfactant, and carrying out first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; and S4, carrying out roasting treatment on the titanium silicalite molecular sieve pre-product. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has a porous structure and high mechanical strength, is used for propylene epoxidation reaction, and can obtain relatively high raw material conversion rate and target product selectivity.

The application provides a multistage micro-nano structure and a preparation method and application thereof, and comprises the following steps: (1) preparing a sacrificial layer on the surface of an initial substrate; (2) preparing a multilayer electron beam resist on the surface of the sacrificial layer, wherein the sensitivities of adjacent two layers of the electron beam resist are different; (3) performing electron beam exposure, development and fixation on the multilayer electron beam resist to obtain a multistage micro-nano resist structure, wherein the exposure patterns and exposure doses of adjacent two layers of the electron beam resist are different; (4) filling the multistage micro-nano resist structure and forming a thin film on the top layer of the multistage micro-nano resist structure; (5) removing the sacrificial layer, turning over and transferring the part above the sacrificial layer upside down to a target substrate, removing the residual electron beam resist, and optionally removing the thin film to obtain the multistage micro-nano structure. The method of the application only needs one-time exposure and thin film deposition, and the prepared multistage micro-nano structure has wide application prospects in the fields of microfluidic devices, optoelectronic devices and the like.

This invention discloses a method for preparing yttrium-magnesium oxide (YMO) multiphase transparent ceramics using non-aqueous gel casting, belonging to the field of ceramic preparation technology. To overcome the problems associated with water-based gel casting, this invention provides a method for preparing YMO multiphase transparent ceramics using non-aqueous gel casting, comprising: ball milling Y2O3, MgO, a dispersant, and a non-aqueous solvent; then adding epoxy resin and a curing agent and ball milling again; the resulting ceramic slurry is defoamed, cured, and dried; then subjected to debinding, sintering densification, cooling, hot isostatic pressing, annealing, and polishing to obtain the YMO multiphase transparent ceramic. This invention overcomes the difficulties in preparing large-size Y2O3-MgO nano-multiphase infrared transparent ceramics and the problem of component inhomogeneity by designing a non-aqueous solvent system and selecting a suitable gel system, and can produce complex-shaped / large-size, uniformly composed YMO nano-multiphase ceramics.

This invention discloses a biomass porous aerogel, its preparation method, and its applications. The preparation method includes the following steps: S1: Sugarcane bagasse is soaked in an alkaline solution, washed, and its pH value is adjusted to 7; after drying, it is carbonized in an inert gas atmosphere to obtain carbonized sugarcane bagasse fiber; S2: Ti3AlC2 is weighed and etched with LiF and HCl to obtain multilayer MXene material; the multilayer MXene material is sonicated in an inert gas atmosphere, centrifuged, and the supernatant is collected and freeze-dried to obtain MXene nanosheets; S3: MXene nanosheets and carbonized sugarcane bagasse fiber are mixed, hydroxyethyl cellulose is added, and after stirring and freezing, ice crystals are removed in a vacuum to obtain biomass porous aerogel. The biomass porous aerogel prepared by this invention has low density, semiconductor properties, significant reversible compression, and excellent mechanical properties, and also features low thermal conductivity, reusability, and low cost.