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anuozhang869金虫 (正式写手)
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[交流]
二氧化钛附着遇到的难题
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本人正在做二氧化钛在二氧化钛在陶粒上的附着，采用的是二氧化钛成品粘粘在陶粒上的方法。 有很多不明白的地方，请高手们不吝赐教 如果我买DEGUSSA p25，用什么样的粘合剂粘呢？粘粘后怎么判断一下他的结合力呢？ 因为我前段时间做了一些尝试，买的是国内一个厂家的成品二氧化钛溶胶，按照说明浸泡之后高温煅烧，反复几次后，SEM发现是在陶粒表面生成了一层白膜，但是水洗之后发现水中大量白沫，可能是粘合力不够。 所以想重新选择dugussa的试一下，但不知道选择什么样的粘合剂呢？ 请前辈们不吝赐教！！ 我很急！！请大家帮忙了！！！ |
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可以这么做
★ ★ ★ ★
buffaloli(金币+4,VIP+0):多谢，辛苦了！
buffaloli(金币+4,VIP+0):多谢，辛苦了！
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2.1. Synthesis of PPMSGF-50 A flowchart for the preparation of PPMSGF-50 is shown in Fig. 1. This procedure is similar to that published previously by Balasubramanian et al. Commercial ultra pure titanium isopropoxide (TTIP, Aldrich), isopropanol (i-PrOH, Fisher Sci- entific), diethanolamine (DEA, Fisher Scientific) and nanophase TiO2 Degussa P-25 powder (50m2/g; 15–30% rutile + 85–70% anatase, mean diameter of 30 nm) were used for the preparation of the modified sol. A 0.5M solution of TTIP in i-PrOH was prepared and a calculated amount of DEA was added to the solution. A molar ratio of DEA/TTIP of 4 was used. The solution was stirred at room temperature for approximately 2 h. Subsequently, water was added drop-wise under vigorous stirring conditions. A molar ratio of H2O/TTIP of 2 was used. A clear and stable alkoxide solwas obtained using this process. The titania modified solwas prepared by adding 50 g/L Degussa P-25 TiO2 powder into the alkoxide sol. The powderwas added slowly under vigorous stirring to prevent the formation of agglomerates. A thick, white, viscous suspension was obtained. This modified sol was being stirred rapidly to prevent precipitation in storage between experiments. The uncoated 304 stainless steel substrates were cleaned with ethanol and methyl ethyl ketone (99.8%, Fisher Scientific). The clean substrates were dried at 125 ◦C for 24 h. A dip coating apparatus equipped with a velocity-control adjustable motor was used to dip in and pull out the substrate at a preset constant velocity. A withdrawal velocity of 12.3±0.5 cm/min was used in this study. After the dip coating procedure was completed, the coatings were dried at room temperature for 24 h, and then placed into a multi-segment programmable high temperature furnace (Paragon Model HT-22-D, Thermcraft Inc., Winston-Salem, NC) for calcination. The furnace temperature was incremented at a ramp rate of 3.0 ◦C/min until 100 ◦C was reached and this temperature was held for 1 h. The temperature of the oven was increased at a rate of 3.0 ◦C/min to a final temperature (400–700 ◦C) and again held for 1 h. Finally, the coatings were cooled naturally to room temperature (approximately a 15 h cooling period). TTIP/2-propanol | | DEA-- --H2O | plain sol | ---- P25 TiO2 | Modified sol | Dip coating | Drying | Calcination | TiO2 film |
9楼2008-08-28 18:37:49
anuozhang869
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2楼2008-07-31 09:15:45
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3楼2008-07-31 13:59:55
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