采用银镜反应及分子自组装技术，在竹材表面原位负载一层纯单质银纳米粒子，赋予竹材导电功能，再经十七氟癸基三甲氧基硅烷（FAS-17）的进一步处理，制备出具有导电功能的仿生超疏水竹材试样，并通过实验观察研究了其稳定性及耐久性。结果表明，制备竹材表面拥有亚微米/纳米二维等级粗糙结构，该结构协同低表面能物质FAS-17共同决定了竹材的超疏水性，竹材表面与水的接触角为155°，滚动角小于10°；制备竹材能够抵抗pH 1~14溶液及强浓度NaCl溶液，且经强烈的溶液搅拌及蒸煮，依旧保持超疏水性和导电性。
The silver nanoparticles are successfully deposited in situ onto the surface of the bamboo through the silver mirror reaction, which makes the intrinsically insulating bamboo conductive. With a further modification by the fluoroalkylsilane(FAS-17), the bamboo timber covered by Ag nanoparticles shows the superhydrophobicity with a water contact angle of 155° and a sliding angle less than 10°. The X-ray diffraction results indicate that the coating on the surface of bamboo is only composed of silver crystals. The scanning electron microscope studies reveal that the coatings possess two dimensional hierarchical structures comprising of the submicron scale papilla and the nano scale granules. The synergistic effect of the submicro/nano binary structure and the low surface energy layer is responsible for the superhydrophobicity of the bamboo surface. Moreover, the study of the stability and the durability of the superhydrophobic bamboo shows that the modified bamboo has a durable superhydrophobic property even under the corrosive solutions including the acidic, alkali and NaCl solutions with different molar concentrations. Especially in harsh conditions of boiling water or intense water stirring, the modified bamboo keeps its superhydrophobicity and high conductivity.
[1] 李坚,孙庆丰.大自然给予的启发:木材仿生科学刍议[J].中国工程科学,2014,16(4):4-12.Li Jian,Sun Qingfeng.Inspirations from nature:Preliminary discussion of wood bionics[J].Engineering Sciences,2014,16(4):4-12.
[2] 刘克松,江雷.仿生结构及其功能材料研究进展[J].科学通报,2009,54(18):2667-2681.Liu Kesong,Jiang Lei.Research progress on biomimetic structural and functional materials[J].Science Bulletin,2009,54(18):2667-2681.
[3] 宋金龙,陆遥,黄帅,等.极端润湿性表面研究与应用进展[J].科技导报,2015,33(15):92-100.Song Jinlong,Lu Yao,Huang Shuai,et al.Progress on research and application of extreme wettability surfaces[J].Science & Technology Review,2015,33(15):92-100.
[4] 江雷.从自然到仿生的超疏水纳米界面材料[J].科技导报,2005,2(23):4-8.Jiang Lei.Super-hydrophobic nanoscale interface materials:From nature to artificial[J].Science & Technology Review,2005,2(23):4-8.
[5] Wang S L,Liu C Y,Wang C Y,et al.Fabrication of superhydrophobic wood surface by a sol-gel process[J].Applied Surface Science,2011,258(2):806-810.
[6] Liu C Y,Wang S L,Shi J Y,et al.Fabrication of superhydrophobic wood surfaces via a solution-immersion process[J].Applied Surface Science,2011,258(2):761-765.
[7] 王成毓,刘峰.一种提高超疏水木材机械稳定性的方法[J].中国工程科学,2014,16(4):79-82.Wang Chenyu,Liu Feng.A method for improve the mechanical robustness of the superhydrophobicwood[J],Engineering Sciences,2014,16(4):79-82.
[8] Sun Q F,Lu Y,Liu Y X.Growth of hydrophobic TiO2 on wood surface using a hydrothermal method[J].Journal of Materials Science,2011,46(24):7706-7712.
[9] Jin C D,Li J P,Han S J,et al.A durable,superhydrophobic,superoleophobic and corrosion-resistant coating with rose-like ZnO nanoflowers on a bamboo surface[J].Applied Surface Science,2014,320:322-327.
[10] Li J P,Sun Q F,Yao Q F,et al.Fabrication of robust superhydrophobicbamboo based on ZnO nanosheetnetworks with improved water-,UV-,and fire-resistant properties[J].Journal of Nanomaterials,2014(1):1-9.
[11] Li J P,Sun Q F,Fan B T,et al.Fabrication of biomimetic superhydrophobic plate-like CaCO3 coating on the surface of bamboo timber inspired from the biomineralization of nacre in seawater[J].Nano Reports,2015(1):9-14.
[12] Rai M,Yadav A,Gade A.Silver nanoparticles as a new generation of antimicrobials[J].Biotechnology Advances,2009,27(1):76-83.
[13] Schneider S,Halbig P,Grau H,et al.Reproducible preparation of silver sols with uniform particles size for application in surfaceenhanced Ramanspectroscopy[J],Photochemistry and Photobiology,1994,60(6):605-610.
[14] Creighton J A,Blatchford C G,Albrecht M G.Plasma resonance enhancement of Raman scattering by pyridine adsorbed on silver or gold sol particles of size comparable to the excitation wavelength[J].Journal of the Chemical Society,Faraday Transactions 2:Molecular and Chemical Physics,1979,75:790-798.
[15] Shirtcliffe N,Nickel U,Schneider S.Reproducible preparation of silver sols with small particle size using borohydride reduction:For use as nuclei for preparation of larger particles[J].Journal of Colloid and Interface Science,1999,211(1):122-129.
[16] Pillai Z S,Kamat P V.What factors control the size and shape of silver nanoparticles in the citrate ion reduction method?[J].Journal of Physical Chemistry B,2003,108(3):945-951.
[17] 万才超,卢芸,孙庆丰,等.新型木质纤维素气凝胶的、表征及疏水吸油性能研究[J].科技导报,2014,32(4/5):79-85.Wan C C,Lu Y,Sun Q F,et al.Preparation and characterization of novel lignocellulose aerogel with hydrophobicity and oil absorption properties[J].Science & Technology Review,2014,32(4/5):79-85.
[18] Babu K F,Dhandapani S,Maruthamuthu S,et al.One pot synthesis of polypyrrole silver nanocomposite on cotton fabrics for multifunctional property[J].Carbohydrate Polymers,2012,90(4):1557-1563.
