34results about How to "Control aspect ratio" patented technology

The invention provides a rosin refining kettle, which comprises a cylindrical pot body, an upper sealing head and a lower sealing head and is characterized by further comprising a mosquito-repellent incense coiler, and preferably comprising a snake-shaped coiler and an outer semicircular coiler. The invention also provides a refining method by using the rosin refining kettle. By the high-efficiency rosin refining kettle, a height-diameter ratio can be controlled effectively and a heating position can be flexibly adjusted according to change of a liquid level during rosin refining, and the load on a vacuum pump set is low. By the refining method, the grade of an obtained rosin product is much higher than the standard of a special grade in China.

The invention discloses a preparation method of a tellurium nanowire material, a tellurium nanowire material and a device. Using tellurium powder as a raw material, the tellurium nanowire is formed on the silicon dioxide surface of a silicon dioxide / silicon substrate by physical vapor deposition. Deposition and growth; the gas phase of the physical vapor deposition is a mixed gas of argon and hydrogen, and the total flow of argon and hydrogen is 70 sccm; the temperature of the physical vapor deposition is 600-800°C. That is, tellurium nanowires are directly prepared on a silicon dioxide / silicon substrate by physical vapor deposition. In this experiment, the preparation method is simple in process, does not involve chemical reactions, has the characteristics of environmental friendliness and low cost, and the prepared tellurium nanowires are of high quality, and the aspect ratio of the nanowires can be controlled and adjusted. Tellurium nanowires can be used as gas sensors, catalysts, thermoelectric materials, photovoltaic materials, solar cells and field effect transistor materials.

The invention relates to a preparation method of a silicon quantum dot film having anisotropy, and discloses a technical method for regulating elemental composition variation to form different strain energy induced anisotropic polymorphous silicon quantum dots, further regulating the absorption spectrum range and obviously improving the photoelectric conversion efficiency of a used material. The preparation method comprises the following main steps: performing pretreatment prior to coating, performing magnetron co-sputtering on a silicon-germanium alloy target and a carbon target having different composition ratios with Ar ions, regulating the sputtering power of the silicon-germanium target and the carbon target, and depositing a composition-controllable amorphous silicon carbide-germanium film on a silicon and glass base; and then, performing multi-stage annealing treatment in a nitrogen gas atmosphere, thus forming the silicon quantum dot film having anisotropy, which is inlaid in amorphous SiC. The film has multi-exciton effect, and simultaneously has multi-wavelength light absorption characteristics in a wavelength range of 1800nm (infrared) to 300nm (ultraviolet), thus hopefully improving the light absorption and photoelectric conversion efficiency of a silicon-based photovoltaic device greatly.

The invention provides a dispersing method capable of accurately regulating and controlling slenderness ratios of alumina whiskers. The dispersing method comprises the following step: dispersing the alumina whiskers in a dispersing agent by adopting a cooperative dispersing method implemented by ultrasonic waves, blade agitation and big ball low-speed ball milling, wherein the dispersing agent comprises a first dispersing agent and a second dispersing agent; the first dispersing agent is polyethylene glycol; the second dispersing agent is 2-amino-2-methyl-1-propanol or polyacrylic acid; the mass ratio of the first dispersing agent to the second dispersing agent is (1 to 3) to (0.1 to 3). Compared with the prior art, the dispersing method has the advantages that a steric-hindrance effect and an electric double layer theory are brought into full consideration, a non-ionic dispersing agent and an anionic dispersing agent prepared from specific components are used in a combination way, and the cooperative dispersing method implemented by the ultrasonic waves, the blade agitation and the big ball low-speed ball milling is adopted on the basis of reasonably controlling the proportion of the two dispersing agents, so that a good dispersing effect of the alumina whiskers of different slenderness ratios is achieved.