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6Â¥2009-06-23 23:15:30
Jason3878
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Wettability is an important characteristic of various surfaces and is dependent of the chemical composition and the geometrical structure of the surface. In recent years, the creation of superhydrophobic surfaces has stimulated tremendous interest in both theoretical research and practical applications. In this work, a simple spray approach to fabricate superhydrophobic coatings on tile and glass substrates is presented. Ëæ±ã·ÒëÁ˼¸¾ä¿´¿´£¬Èç¹û¿ÉÒԵϰÔÙ½Ó×Å·ÒëÏÂÃæµÄ¡£ |
2Â¥2009-06-23 13:04:01
zhaoshans
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cam967(½ð±Ò+15,VIP+0):5555£¬µ±Ê±ÎÒÒ»¿´¾õµÃºÜÏñ£¬Ò»ÅÖ®ÏÂÑÔÖØÀ²£¡Ð»Ð»À²£¡ 6-24 17:11
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±¾ÎÄÀûÓù¤ÒµÔÁϾ۱½ÁòÃÑ΢·ÛºÍÊèË®ÐÔ¶þÑõ»¯¹èÄÉÃ×·ÛÄ©£¬²ÉÓÃÅçÍ¿·¨ÔÚ´Éש±íÃæÖÆ±¸ÁËÊèË®¸´ºÏÍ¿²ã¡£Ñо¿ÁËÈÈ´¦Àíζȡ¢×é·ÖÅä±È¶ÔÍ¿²ã±íÃæÐÎò¡¢´Ö²Ú¶ÈºÍ½Ó´¥½ÇµÄÓ°Ï죬·¢ÏÖËæ×ÅÈÈ´¦ÀíζÈÉý¸ß£¬Í¿²ã±íÃæ´Ö²Ú¶ÈÔö´ó£¬Ëæ×ÅÊèË®ÐÔ¶þÑõ»¯¹èº¬Á¿µÄÔö¼Ó£¬ÓÉÓÚ±íÃæ¾Û¼¯µÄÊèË®ÐÔ¶þÑõ»¯¹èÔö¶à£¬Í¿²ãÊèË®ÐÔÔöÇ¿£¬ÔÚÈÈ´¦ÀíζÈΪ280¡æ¡¢ÊèË®ÐÔ¶þÑõ»¯¹èÓë¾Û±½ÁòÃÑÖÊÁ¿±ÈΪ1:1ʱ£¬¿É»ñµÃ³¬ÊèˮͿ²ã£¬Í¿²ãµÄ½Ó´¥½Ç´óÓÚ150¡ã£¬¹öÂä½ÇСÓÚ4¡ã£¬pHֵΪ1~14µÄË®ÈÜÒºÔÚÆä±íÃæ¶¼¾ßÓкܸߵĽӴ¥½Ç¡£³¬ÊèˮͿ²ã¾ßÓÐÁ¼ºÃµÄ×ÔÇå½àЧ¹û£¬²¢ÇÒ¾Âäɳ·¨ÊµÑé²â¶¨£¬³¬ÊèˮͿ²ãÄ͹ÎÉËÐÔÄÜÁ¼ºÃ¡£ In this paper, based on polyphenylene thioether powder of industrial material and hydrophobic nano-silica powder as raw materials, hydrophobic surface coating was prepared on tile surface using ceramic spraying method. Researches about the impacts of heat treatment temperature, group distribution ratio on coating surface morphology, roughness and contact angle were completed. Results showed that as temperature shows an increase, also coating surface roughness is increasing, while hydrophobic silica concentration rises, hydrophobic capacity of coating surface enhances, as a result of silica concentration on hydrophobic surface grows. At heat treatment temperature of 280¡æ, and the ratio of hydrophobic silica and polyphenylene sulfide equal to 1:1, it is available to obtain super-hydrophobic coatings, whose contact angle is greater than 150¡ã, and rolling angle of less than 4 ¡ã. Aqueous solutions in pH value of 1 to 14 on its surface have a high contact angle. Super-hydrophobic coating not only has an excellent self-cleaning effect, but scratch resistant performance after determination of sediment loading in experiment. |
3Â¥2009-06-23 13:27:39
Jason3878
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- ×¢²á: 2009-04-19
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cam967(½ð±Ò+60,VIP+0):ллÐֵܿ¶¿®ÏàÖú£¬Áôµã¸øºóÃæÐ޸ĵÄÈ˰ɣ¡ 6-23 13:41
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| With the increase of the thermal treatment temperature, both the surface roughness and the contact angle increased when the temperature was lower than 280¡æ. As the weight ratio of H-SiO2 to PPS rose from 1:10 to 1:1, more H-SiO2 powders accumulated on the surface, leading to a significant increase of hydrophobicity. The surface coating obtained at 280¡æ with the weight ratio of H-SiO2 to PPS 1:1 showed a water contact angle higher than 150¡ã and a sliding angle lower than 4¡ã, exhibiting fascinating superhydrophobic properties. The surface coating could remain superhydrophobicity upon a further increase in thermal treatment temperature or the amount of H-SiO2 powder. Moreover, the surface coatings show high contact angles, greater than 150¡ã, for all the solutions with pH ranging from 1 to 14. The abrasion resistant property of the as-prepared superhydrophobic surface coating was tested using a homemade setup. When scraped by freely-falling sands, the superhydrophobic coating could keep its high hydrophobicity, while a commercial hydrophobic coating transformed from hydrophobicity to hydrophilicity. This result implied our superhydrophobic surface coating was very stable. Moreover, chalk powders on the superhydrophobic surface coatings could easily be washed off with water, indicating good self-cleaning properties. The presented approach is convenient and can be potentially applied in fabrication of superhydrophobic surfaces in large scale. |
4Â¥2009-06-23 13:39:11













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