Switching of hydrophilic to ultra hydrophilic properties of flower-like gold nanostructures

Surface Science of DNA Adsorption onto Citrate-Capped Gold Nanoparticles

“…Recently, Nelson and Rothberg proposed that hydrophobic interactions should be the main attractive force since the previously cited DLVO theory could not account for the difference between the adsorption of ss- and ds-DNA, the adsorption of different DNA base sequences, or the effect caused by different types of inorganic salts . However, this viewpoint is not in line with the observation that the surface of freshly prepared AuNPs is hydrophilic. , Other studies indicated a specific bonding interaction between DNA bases and AuNPs. ,− In addition, the belief that DNA adsorption is irreversible or desorption does not occur has not been substantiated with experimental evidence . Finally, it was observed that shorter DNA strands are adsorbed more quickly than longer ones, but their relative effectiveness in protecting AuNPs from salt-induced aggregation might follow a different trend since it is quite straightforward to assume that the longer DNAs bind more tightly to AuNPs due to the establishment of more contacting points on the AuNP surface.…”

“…41 However, this viewpoint is not in line with the observation that the surface of freshly prepared AuNPs is hydrophilic. 44,45 Other studies indicated specific bonding interaction between DNA bases and AuNPs. 42,[46][47][48][49] In addition, the belief that DNA adsorption is irreversible or desorption does not occur has not been substantiated with experimental evidence.…”

Study on the influencing factors of spontaneous wettability transition behaviour on metallic-based surfaces

“…However, during the study of the hydrophobic metallic surfaces, an unusual feature of spontaneously changing wettability phenomenon has been discovered and the time-dependent wettability has been confirmed [5,6]. For example, Liu et al reported that a smooth metallic Au surfaces could become hydrophobic merely by introducing micro/nanostructures without any additional surface modification [7].…”

Reversible wettability between superhydrophobicity and superhydrophilicity of Ag surface

“…In addition, superhydrophilicity, the other extreme wettability state of surface, that water contact angle less than 10°, also has attracted most attentions from theoretical investigation as well as industrial applications [24−26]. Inspired by the creatures of superhydrophobicity or superhydrophilicity in nature, smart functional materials with switchable extreme wetting behaviors must have greater value and application prospect [27,28], such as tunable wettability devices, rapid water motion, quick wetting responsiveness, smart separation membranes and controlled transportation of fluids.…”