Deposition of thick, rigid and size-controlled silica particle layer on aluminum sheet for water vapor adsorption
Deposition of thick, rigid and size-controlled silica particle layer on aluminum sheet for water vapor adsorption
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在铝片上沉积厚的、刚性的、尺寸可控的二氧化硅颗粒层，用于水蒸气吸附
DOI：
10.1016/j.applthermaleng.2017.06.072
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发表时间：
2017
影响因子：
6.4
通讯作者：
Yoshio Otani
中科院分区：
文献类型：
--
作者：
Mikio Kumita;Takumi Oya;Koichi Matsui;Yuji Suwa;Akio Kodama;Hidenori Higashi;Takafumi Seto;Yoshio Otani
针对吸附式冷水机组新型吸附式换热器的开发，采用溶胶-凝胶和电泳相结合的方法制备了硅包覆铝板。将四乙氧基硅烷前驱体在乙醇溶液中水解合成硅溶胶，然后通过电泳沉积直接在铝板上形成硅溶胶层。在直流电场的氨水浴中对涂硅铝板进行了时效处理。结果表明，这种时效处理能有效地在铝板上形成坚硬的硅层。结果表明，所得到的层是由单分散的球形亚微米级二氧化硅颗粒组成的。硅溶胶溶液中的十二烷基硫酸钠（SDS）对硅颗粒的沉积量和粒径起着重要的控制作用。随着SDS浓度的增加，粒径从0.10增大到0.83µm。在pH值为10.6，SDS质量浓度为0.05质量%的条件下制备的硅包覆铝板，沉积量最大值为19.8 mg cm - 2，远高于Kishida等（1994）报道的结果。通过体积实验对制备的复合材料的水蒸气吸附特性进行了评价。吸附实验结果表明，在相对压力小于0.3的范围内，二氧化硅含量较高的复合材料吸附的水蒸气量较大。
Toward the development of a new adsorbent heat exchanger of adsorption chillers, silica-coated aluminum sheets were prepared by the combination of sol-gel and electrophoretic deposition techniques. Silica sols were synthesized by the hydrolysis of tetraethoxysilane precursor in an ethanol solution, and then a silica layer was directly formed on an aluminum sheet by electrophoretic deposition of the silica sols. The silica-coated aluminum sheets were subjected to the aging treatment in an ammonia water bath with a DC electric field. This aging treatment was found to be very effective to form rigid silica layer on aluminum sheet. It was found that the obtained layer was composed of monodisperse and spherical submicron-sized silica particles. Sodium dodecyl sulfate (SDS) in the silica sol solution played an important role in controlling the deposited amount of silica particles as well as their sizes. The particle size increased from 0.10 to 0.83 µm with an increase in SDS concentration. For the silica-coated aluminum sheet prepared at a pH value of 10.6 and a SDS concentration of 0.05 mass%, the deposited amount reached a maximum value of 19.8 mg cm−2, which was much higher than those reported by Kishida et al. (1994). The prepared composites were evaluated for the characteristics of water vapor adsorption through volumetric experiments. The results of adsorption experiments showed that the composite with a higher silica content adsorbed a larger amount of water vapor in the relative pressure range below 0.3.