Fapeng Wang,Li Wang,Huaping Wu,Jiuyin Pang,Di Gu,Song Li
Biological microstructures have been a source of inspiration for scientific researchers and artists. In this paper, the microstructure of the lotus leaf was replicated on the bamboo surfaces by soft lithography, using a fresh lotus leaf as the template and polydimethylsiloxane (PDMS) for a seal. And the hydrophobic monodisperse nano SiO 2 microspheres were added to improve the strength, abrasion resistance, and water resistance of the bamboo surfaces. X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and atomic force microscope (AFM) showed that the lotus-leaf-like bamboo had a polycrystalline surface, and the lotus-leaf-like topography played a very important role in the fabrication of the superhydrophobic surface. The water contact angle (WCA) of lotus-leaf-like bamboo surface was 152.5° with a low hysteresis showing a good superhydrophobic property. The successful preparation of the lotus-leaf-like bamboo provided a new method for researches on the water corrosion resistance of bamboos, and also confirmed the feasibility that hydrophilic surfaces like the bamboo could be achieved with the nanotechnology.
The surfaces of plants represent multifunctional interfaces between the organisms and the environment. The paper reports an experimental method to improve the bamboo properties, in terms of hydrophobicity, and resistance to water absorption. The soft lithography technique was used to modify the bamboo surface, transferring over it a lotus-leaf-like topography, based on a micro/nano hierarchical structure using fresh lotus leaves as the template and polydimethylsiloxane (PDMS) for seal. Results describe a characterization based on topographical, chemical and water contact angle analysis. The super-hydrophobicity of lotus-like bamboo surfaces were analyzed by virtue of WCA and the microstructures observed by means of SEM, showing a WCA of 156.5° close to that of the lotus leaf’s 160.5°, and rough surface structures with micro-nano papillate hills on bamboo surfaces. Water droplets could easily roll down on such bamboo surfaces, exhibiting super-hydrophobic and low adhesion properties. The successful fabrication of lotus-leaf-like bamboos provided a new direction for researches on the water corrosion resistance of bamboos, which could effectively prevent the damage of moisture to bamboos.
Fei Rao,Yuhe Chen,Xiping Zhao,Hanjiang Cai,Neng Li,Yongjie Bao
Benzotriazole (BTZ), benzophenone (BP), nano-TiO 2 (NTiO 2 ), and nano-ZnO (NZnO) are potential components of UV protection coatings due to being UV light absorbers. Herein, the UV-protective effects of four acrylic coatings containing individual organic and inorganic UV light absorbers and another four coatings containing both types of absorbers were determined by employing accelerated bamboo aging tests. Although organic absorbers decomposed during aging, their degradation rate decreased in the presence of inorganic absorbers. Moreover, individual organic absorbers were better suited for color stabilization than inorganic ones, with the best bamboo surface photostability enhancement achieved by BTZ-containing coatings (BTZ, BTZ-NZnO, and BTZ-NTiO 2 ). Furthermore, strong synergistic effects were detected for BTZ-NZnO and BTZ-NTiO 2 , whereas an antagonistic effect was observed for BP-NTiO 2 and BP-NZnO. Thus, combinations of organic and inorganic UV light absorbers efficiently inhibited the degradation of the former, with the performance of clear coatings determined by the type of the organic absorber.
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