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2025-08-13 01:40 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 specific morphology, is always a challenge, which is rarely other words, for our case exploring a proper condition, at which the silicon and metal sources can simultaneously hydrolyze, can ensure a desired next, let’s look at the synthetic y,….then, ….after that, ….at last, we obtained thein this work, by changing the synthesis conditions, such as …, and so on, the pure mesoporous silica with different morphologies were synthesized, including nanosphere, nanorod, helix, capsule and will focus on the preparation and catalytic application of mesoporous silica with nanotube the sem images of samples: a1, a2, a3 are shown in the can be seen that sample a1 is nanowirelike with length of about 2μm and diameter of about the amount of...is g, the morphology of sample a2 became to be short and thick rods and the size is about 1μm in length and 400nm in diameter, further increasing the amount of..., the sample a3 and a4 turned to be spherical also can be seen that the diameters of samples a3 and a4 are substantially the same about r, the spherical morphology of a4 is more regular than that of xrd patterns showed four reflection peaks attributed to(100),(110),(200)and(210), respectively, due to the hexagonal then, we keep the same amount of..., increasing the amount of....we found that the length increased xrd patterns also showed the hexagonal sructure of samples b1, b2, b3, moreover, an additional proof of the hexagonal symmetry structure is given by tem and the ft n2 adsorptiondesorption isotherms of the samples b1, b2, b3, b4 exhibit a typical typeiv ing to the table of structural parameters, we can find that the specific surface area and total pore volume increase gradually, the thickness of wall decrease and there is no obvious change in furthermore, the possible synthesis mechanism of the mesoporous silica nanotube in dual templates system was suggest that due to electrostatic repulsion between positively charged ammonium ions from hydrated ammonia molecules and hydrophilic groups of..., especially in ammonia(nh3, 25wt.%)solution, the high concentrated ammonium ions provide a crowded and repulsive space to prevent the conjunction of...molecules, leading to the formation of the rodlike micelles as template to form pore structure instead of spherelike role of cotemplate...is suggested to tune the length of rodlike micelles by arranging itself along the axis of channel with peo and ppo part immersed in the hydrophilic and the hydrophobic group of cta+ a result, the mesoporous nanotube with different length will be r, the nonpolar...micelles are not affected by positively charged the amount of cotemplate in
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