Superhydrophobic surfaces with hierarchical structure

2011 ◽  
Vol 65 (19-20) ◽  
pp. 2902-2905 ◽  
Author(s):  
N. Gao ◽  
Y.Y. Yan ◽  
X.Y. Chen ◽  
D.J. Mee
Keyword(s):  
Hierarchical Structure ◽  
Superhydrophobic Surfaces

scholarly journals Facile Construction of Superhydrophobic Surfaces by Coating Fluoroalkylsilane/Silica Composite on a Modified Hierarchical Structure of Wood

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 813 ◽  
Author(s):  
Jiajie Wang ◽  
Yingzhuo Lu ◽  
Qindan Chu ◽  
Chaoliang Ma ◽  
Lianrun Cai ◽  
...  
Keyword(s):  
Hierarchical Structure ◽  
Composite Structure ◽  
Superhydrophobic Surface ◽  
Superhydrophobic Surfaces ◽  
Commercial Application ◽  
Self Healing ◽  
Nano Composite ◽  
Mildew Resistance ◽  
Silica Composite ◽  
Inorganic Matter

Constructing superhydrophobic surfaces by simple and low-cost methods remains a challenge in achieving the large-scale commercial application of superhydrophobic materials. Herein, a facile two-step process is presented to produce a self-healing superhydrophobic surface on wood to improve water and mildew resistance. In this process, the natural hierarchical structure of wood is firstly modified by sanding with sandpaper to obtain an appropriate micro/nano composite structure on the surface, then a fluoroalkylsilane/silica composite suspension is cast and dried on the wood surface to produce the superhydrophobic surface. Due to the full use of the natural hierarchical structure of wood, the whole process does not need complicated equipment or complex procedures to construct the micro/nano composite structure. Moreover, only a very low content of inorganic matter is needed to achieve superhydrophobicity. Encouragingly, the as-obtained superhydrophobic surface exhibits good resistance to abrasion. The superhydrophobicity can still be maintained after 45 abrasion cycles under the pressure of 3.5 KPa and this surface can spontaneously recover its superhydrophobicity at room temperature by self-healing upon damage. Moreover, its self-healing ability can be restored by spraying or casting the fluoroalkylsilane/silica composite suspension onto this surface to replenish the depleted healing agents. When used for wood protection, this superhydrophobic surface greatly improves the water and mildew resistance of wood, thereby prolonging the service life of wood-based materials.

scholarly journals TiO 2 nanowire-templated hierarchical nanowire network as water-repelling coating

2017 ◽  
Vol 4 (12) ◽  
pp. 171431 ◽  
Author(s):  
Tian Hang ◽  
Hui-Jiuan Chen ◽  
Shuai Xiao ◽  
Chengduan Yang ◽  
Meiwan Chen ◽  
...  
Keyword(s):  
Hierarchical Structure ◽  
Rational Design ◽  
Hydrothermal Reaction ◽  
Zno Nanowires ◽  
Superhydrophobic Surfaces ◽  
Nano Structure ◽  
Nanowire Network ◽  
The Hierarchical Structure ◽  
Potential Applications ◽  
Surface Superhydrophobicity

Extraordinary water-repelling properties of superhydrophobic surfaces make them novel candidates for a great variety of potential applications. A general approach to achieve superhydrophobicity requires low-energy coating on the surface and roughness on nano- and micrometre scale. However, typical construction of superhydrophobic surfaces with micro-nano structure through top-down fabrication is restricted by sophisticated fabrication techniques and limited choices of substrate materials. Micro-nanoscale topographies templated by conventional microparticles through surface coating may produce large variations in roughness and uncontrollable defects, resulting in poorly controlled surface morphology and wettability. In this work, micro-nanoscale hierarchical nanowire network was fabricated to construct self-cleaning coating using one-dimensional TiO 2 nanowires as microscale templates. Hierarchical structure with homogeneous morphology was achieved by branching ZnO nanowires on the TiO 2 nanowire backbones through hydrothermal reaction. The hierarchical nanowire network displayed homogeneous micro/nano-topography, in contrast to hierarchical structure templated by traditional microparticles. This hierarchical nanowire network film exhibited high repellency to both water and cell culture medium after functionalization with fluorinated organic molecules. The hierarchical structure templated by TiO 2 nanowire coating significantly increased the surface superhydrophobicity compared to vertical ZnO nanowires with nanotopography alone. Our results demonstrated a promising strategy of using nanowires as microscale templates for the rational design of hierarchical coatings with desired superhydrophobicity that can also be applied to various substrate materials.

Fabrication of Superhydrophobic Surfaces with Hierarchical Structure through a Solution-Immersion Process on Copper and Galvanized Iron Substrates

Langmuir ◽  
2008 ◽  
Vol 24 (19) ◽  
pp. 10895-10900 ◽  
Author(s):  
Wenguo Xu ◽  
Hongqin Liu ◽  
Shixiang Lu ◽  
Jinming Xi ◽  
Yanbin Wang
Keyword(s):  
Hierarchical Structure ◽  
Superhydrophobic Surfaces

Relationships between hierarchical structure and properties in macromolecular systems

1987 ◽  
Vol 45 ◽  
pp. 440-443
Author(s):  
E. Baer
Keyword(s):  
Uniaxial Tension ◽  
Hierarchical Structure ◽  
Inorganic Material ◽  
Hierarchical Structures ◽  
Bone Collagen ◽  
Structure And Properties ◽  
Connective Tissues ◽  
Scale Level ◽  
Fibrous Protein ◽  
Macromolecular Systems

The most advanced macromolecular materials are found in plants and animals, and certainly the connective tissues in mammals are amongst the most advanced macromolecular composites known to mankind. The efficient use of collagen, a fibrous protein, in the design of both soft and hard connective tissues is worthy of comment. Very crudely, in bone collagen serves as a highly efficient binder for the inorganic hydroxyappatite which stiffens the structure. The interactions between the organic fiber of collagen and the inorganic material seem to occur at the nano (scale) level of organization. Epitatic crystallization of the inorganic phase on the fibers has been reported to give a highly anisotropic, stress responsive, structure. Soft connective tissues also have sophisticated oriented hierarchical structures. The collagen fibers are “glued” together by a highly hydrated gel-like proteoglycan matrix. One of the simplest structures of this type is tendon which functions primarily in uniaxial tension as a reinforced elastomeric cable between muscle and bone.

Factor Structure of the Anxiety Sensitivity Profile: Evidence for a Hierarchical Structure

1999 ◽  
Author(s):  
Craig N. Sawchuk ◽  
David F. Tolin ◽  
Suzanne A. Meunier ◽  
Scott O. Lilienfeld ◽  
Jeffrey M. Lohr ◽  
...  
Keyword(s):  
Factor Structure ◽  
Hierarchical Structure ◽  
Anxiety Sensitivity ◽  
Sensitivity Profile
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