Houngkamhang Nongluck, Chaisawat Ploymanee, Joksathit Waisaree, Samart Sutichai, Chutipaijit Sutee, Radomyos Suphichaya, Saengdee Pawasuth, Atthi Nithi
College of Materials Innovation and Technology, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand.
Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand.
Nanomaterials (Basel). 2022 Feb 6;12(3):557. doi: 10.3390/nano12030557.
Biofilm-associated infections caused by an accumulation of micro-organisms and pathogens significantly impact the environment, health risks, and the global economy. Currently, a non-biocide-releasing superhydrophobic surface is a potential solution for antibacterial purposes. This research demonstrated a well-designed robust polydimethylsiloxane (PDMS) micro-structure and a flame treatment process with improved hydrophobicity and bacterial anti-adhesion properties. After the flame treatment at 700 ± 20 °C for 15 s, unique flower-petal re-entrant nano-structures were formed on pillars (PIL-F, width: 1.87 ± 0.30 μm, height: 7.76 ± 0.13 μm, aspect ratio (A.R.): 4.14) and circular rings with eight stripe supporters (C-RESS-F, width: 0.50 ± 0.04 μm, height: 3.55 ± 0.11 μm, A.R.: 7.10) PDMS micro-patterns. The water contact angle (WCA) and ethylene glycol contact angle (EGCA) of flame-treated flat-PDMS (FLT-F), PIL-F, and C-RESS-F patterns were (133.9 ± 3.8°, 128.6 ± 5.3°), (156.1 ± 1.5°, 151.5 ± 2.1°), and (146.3 ± 3.5°, 150.7 ± 1.8°), respectively. The adhesion on the C-RESS-F micro-pattern with hydrophobicity and superoleophobicity was 42.6%, 31.8%, and 2.9% less than FLT-F, PIL-F, and Teflon surfaces. Therefore, the flame-treated C-RESS-F pattern is one of the promising bacterial anti-adhesion micro-structures in practical utilization for various applications.
由微生物和病原体聚集引起的生物膜相关感染对环境、健康风险和全球经济产生了重大影响。目前，一种不释放杀生剂的超疏水表面是用于抗菌目的的潜在解决方案。本研究展示了一种精心设计的坚固聚二甲基硅氧烷（PDMS）微结构以及一种具有改善的疏水性和细菌抗粘附性能的火焰处理工艺。在700±20°C下进行15秒的火焰处理后，在柱体（PIL-F，宽度：1.87±0.30μm，高度：7.76±0.13μm，纵横比（A.R.）：4.14）和带有八条条纹支撑的圆环（C-RESS-F，宽度：0.50±0.04μm，高度：3.55±0.11μm，A.R.：7.10）的PDMS微图案上形成了独特的花瓣状凹入纳米结构。火焰处理后的平板PDMS（FLT-F）、PIL-F和C-RESS-F图案的水接触角（WCA）和乙二醇接触角（EGCA）分别为（133.9±3.8°，128.6±5.3°）、（156.1±1.5°，151.5±2.1°）和（146.3±3.5°，150.7±1.8°）。具有疏水性和超疏油性的C-RESS-F微图案上的附着力分别比FLT-F、PIL-F和聚四氟乙烯表面少42.6%、31.8%和2.9%。因此，火焰处理后的C-RESS-F图案是在各种应用的实际利用中具有前景的细菌抗粘附微结构之一。
