Search results

The purpose of this study is to prepare a robust superhydrophobic coating on concrete substrate with remarkable chemical and mechanical durability through “all-covalent” strategy.

Amino-modified silica nano/micro-particles were prepared through two synthetic steps. “All-covalent” strategy was introduced to prepare a robust superhydrophobic coating on concrete surface via a “all-in-one” dispersion and a simple spraying method. The successful construction of the products was confirmed by Fourier transform infrared spectroscopy, water contact angles (WCA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The concrete protective properties were verified by solution immersion test, pull-off test and rapid chloride migration coefficient test. The mechanical durability was tested by falling sand impact.

Hierarchical structures combined with the low-surface-energy segments lead to typically superhydrophobic coating with a WCA of 156° and a sliding angle of 1.3°. The superhydrophobic coating prepared through “all-covalent” strategy not only improves chemical and mechanical durability but also achieves higher corrosion and wear resistance than the comparison sample prepared by physically blending strategy. More importantly, the robust superhydrophobic coating showed excellent adhesion and protective performance of concrete engineerings.

This new “all-covalent” superhydrophobic coating could be applied as a concrete protective layer with properties of self-cleaning, anti-graffiti, etc.

Introduction of both silica nanoparticles and silica microparticles to prepare a robust superhydrophobic coating on concrete surface through “all-covalent” strategy has not been systematically studied previously.

The purpose of this study is to prepare a polydopamine (PDA)–palygorskite (Pal) hybrid-reinforced epoxy coating with high adhesion strength on wet concrete surface.

One synthetic step was adopted to prepare novel PDA–Pal hybrid epoxy coating. The process and product were analyzed and confirmed by FIRT, thermogravimetric analysis and scanning electron microscopy. The mass fraction of PDA–Pal hybrid affecting the adhesion strength of epoxy coating was analyzed and confirmed by pull-off test.

PDA–Pal hybrid mass fractions of 0, 1, 3 and 5 were added to the coatings. For a 5 Wt.% PDA–Pal hybrid content, the adhesive strengths on the saturated or underwater concrete surfaces increased to 4.0 and 2.5 MPa, respectively. In addition, the tensile mechanical property of the epoxy coating improved significantly after PDA–Pal addition.

This new epoxy coating hybrid by PDA–Pal could be applied as a concrete protective layer near water or in wet or damp environments.

Introduction of PDA–Pal hybrid to prepare epoxy coating with high adhesion strength on wet concrete surface has not been systematically studied previously.

The purpose of this study is to prepare a chemically stable superhydrophobic coating with remarkable mechanical properties and concrete protective properties.

One synthetic step was adopted to prepare superhydrophobic coating. The process and product were analyzed and confirmed by fourier transform-infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), water contact angle (WCA), transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The mechanical properties were confirmed by tensile test. The concrete protective properties were confirmed by solution immersion test and rapid chloride migration coefficient test.

MSiO₂ nanoparticles (NPs) were chosen to enhance the hydrophobicity of fluorosilicone coatings. With a 4:1 mass ratio of fluorosilicone resin and MSiO₂ NPs, the coatings show superhydrophobicity with a WCA of 156° and a SA of 3.1°. In addition, the tensile mechanical property was improved, and the chloride ion diffusion coefficient was decreased significantly after the addition of MSiO₂ NPs.

This new fluorosilicone coating hybrid by MSiO₂ NPs could be applied as a concrete protective layer with properties of self-cleaning, antifouling, etc.

Introduction of MSiO₂ NPs hybrid to prepare fluorosilicone coating with superhydrophobicity on concrete surface has not been systematically studied previously.

This study mainly aims to examine the mediating effect of perceived organizational support (POS) and the moderating effect of locus of control and job autonomy on the relationship between customer mistreatment behavior and organizational citizenship behavior.

Through a questionnaire survey of 231 employees and their direct supervisors of five hotels in Guangzhou. This paper analyzed five variables (customer mistreatment, POS, locus of control, job autonomy and organizational citizenship behavior) relationships through a variety of data analysis.

Results indicate that customer mistreatment behavior has a negative effect on employees’ organizational citizenship behavior. The relationship between customer mistreatment behavior and employees’ organizational citizenship behavior is partially mediated by employees’ POS. Staffs’ locus of control and job autonomy can modulate the relationship between customers’ mistreatment behavior and POS. Furthermore, the indirect mediating effect of POS on customer mistreatment behavior is revealed. The organizational citizenship behavior linkage is significant only to staff who perceived they have a high level of job autonomy and a high locus of control.

Hotels are advised to provide organizational support and the management of customer mistreatment behavior so as to reflect their employees’ value, seek service innovation and promote production efficiency in practice. Furthermore, it maintains and promotes operational efficiency for service organizations and means the organization pays more attention to meet the social, emotional and psychological needs of its employees.

This article reveals the mechanism relationship between customer mistreatment behavior and employee organizational citizenship behavior. First, it defines the concept of customer mistreatment in the hotel industry and enriches the related research. Second, the study, from the perspective of customer mistreatment, has opened up a new view of organizational citizenship behavior research. Third, we built a research model and it is helpful to grasp the inner mechanism between customer mistreatment and employees’ organizational citizenship behavior. Fourth, this research benefits service organizations so as to maintain and improve their operation efficiency. Furthermore, it can have theoretical guidance for service-oriented organizations to develop a harmonious consumption culture and organizational culture.