84 results about "Hexadecyltrimethylammonium bromide" patented technology

The present invention is a preparation method of gold nanorods whose length-to-diameter ratio can be adjusted in a large range. The strong reducing agent sodium borohydride reduces tetrachloroauric acid to obtain gold seed solution; the preparation of growth solution: prepare the mixed solution of hexadecyltrimethylammonium bromide, tetrachloroauric acid and silver nitrate, and the mol ratio of the three is 20:1:0.1~20:1:5, add crotonic acid solution to obtain a growth solution; growth of gold nanorods: inject gold seed solution into the growth solution, react for 6-12 hours, and obtain gold nanorods. The invention adopts crotonic acid as growth solution modifier, and solves the biological toxicity and biological modification problems caused by CTAB. The yield of the short-length-diameter ratio gold nanorods prepared can be as high as about 90%, the size distribution is narrow, and the length-diameter ratio is about 1.92. The aspect ratio of the prepared gold nanorods can be adjusted in a wide range from 1.9 to 7.5.

The invention provides a composite nano-material with nano-particles wrapped by meso-porous silica, and a preparation method and an application thereof. The preparation method comprises the followingsteps: firstly, dispersing nano-particles into an ethanol-water solution, adding ammonium hydroxide to adjust the pH value, dropwise adding an ethanol-water solution of hexadecyltrimethylammonium bromide under the ultrasonic action, continuing ultrasonic treatment, dropwise adding tetraethoxysilane, and purifying to obtain the composite nano material which takes meso-porous silica as a shell and nano-particles as a core and is uniform, stable and controllable in size. Binuclear or trinuclear nanoparticles of different types / functions can be embedded into the same meso-porous silica shell to realize multi-core wrapping, the method is universal, can be expanded to wrapping of more different nano-particles, is green and efficient in preparation process, can be carried out at room temperature,and is hydrophilic in used solvent, low in cost and simple in process, the particle size of the obtained composite nano-material is as low as 50 nm, and the composite nano-material with different sizes can be obtained by adjusting the proportion of used reagents.

The present invention provides a method of producing ternary metal-based nanowire networks. The method comprises combining an aqueous mixture of a platinum hydrate, a ruthenium hydrate, and an iron hydrate with a solution of hexadecyltrimethylammonium bromide in chloroform to form an inverse micellar network; adding a reducing agent to reduce metal ions within the inverse micellar network; and isolating the nanowires. The relative amounts of the platinum, ruthenium and iron in the mixture correlate to the atomic ratio of the platinum, ruthenium and iron in the ternary nanowires. The diameters of the ternary nanowires are from about 0.5 nm to about 5 nm.