ORCID Profile
0000-0001-7510-2886
Current Organisation
University of Birmingham
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Publisher: American Chemical Society (ACS)
Date: 30-03-2022
Publisher: Elsevier BV
Date: 04-2012
Publisher: Elsevier BV
Date: 12-2020
Publisher: WORLD SCIENTIFIC
Date: 19-06-2016
Publisher: Elsevier BV
Date: 06-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR11736C
Abstract: Nanoparticles are becoming frequently used in the research area of creating functional surfaces because they can be more versatile than just making dimensions smaller. Particularly, a variety of nanoparticles have been applied for the construction of superhydrophobic and superhydrophilic surfaces with micro- and nano-scaled structures. As nanoparticles can also be fashioned and modified, their effects will be of great importance to the formed surface structures. In the present paper, we review the recent research progress in the utilization of nanoparticles to form extremely wettable/non-wettable surface structures and their influence on surface wettability. This report manifests an apparent inclination of nanoparticle structured surfaces using the multidisciplinary approaches, from the viewpoint of engineer/scientist. Therefore, the typical methodologies with regard to the use of nanoparticles, including the preparation and functionalisation processes, for the realization of surface wettabilities are discussed in this work. The discussions also represent some of the size-determined phenomena that are related to wettable/non-wettable surfaces. This Review thus provides an insight into the connection between nanoparticles and surface wettability.
Publisher: Springer Science and Business Media LLC
Date: 03-2013
Publisher: ASMEDC
Date: 2010
DOI: 10.1115/IHTC14-22850
Abstract: Surface wetting properties play important roles in boiling and condensation. In this paper, the wetting behaviours of a single droplet on micro structured or patterned surfaces with different roughness parameters are investigated theoretically and numerically. A theoretical model is proposed to study wetting transitions. Comparison between results obtained by theoretical analysis with those of experiment indicates that the proposed model can give a better prediction of wetting transition. In addition, a numerical simulation based on lattice Boltzmann method (LBM) is performed to study surface wetting properties and also the evolution of droplet shapes, dynamic contact angle and corresponding velocity fields. In the simulation, the droplet size is comparable with the scale of micro posts on the surface.
Publisher: Wiley
Date: 06-03-2014
Publisher: Wiley
Date: 11-11-2014
Publisher: Springer Science and Business Media LLC
Date: 12-01-2015
DOI: 10.1038/SREP07716
Publisher: Wiley
Date: 19-10-2020
Publisher: American Chemical Society (ACS)
Date: 30-11-2018
Publisher: Springer Science and Business Media LLC
Date: 12-2009
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.FOODCHEM.2018.11.136
Abstract: The hard milk fat (HMF) fraction of milk fat was isolated via dry, thermal fractionation, followed by a solvent washing process. The resulting HMF crystals were visibly free of entrapped liquid fat, and subsequently characterised by thermal analysis, X-ray diffraction, and electron microscopy. The HMF crystals were found to be mostly β' and β'
Publisher: American Chemical Society (ACS)
Date: 21-12-2016
DOI: 10.1021/ACS.LANGMUIR.6B03792
Abstract: A water drop moving on a superhydrophobic surface or an oil drop moving on a superoleophobic surface dissipates energy by pinning/depinning at nano- and microprotrusions. Here, we calculate the work required to form, extend, and rupture capillary bridges between the protrusions and the drop. The energy dissipated at one protrusion W
Publisher: American Association for the Advancement of Science (AAAS)
Date: 17-01-2020
Abstract: We monitor the self-cleaning process on a single-particle level and quantify the involved forces.
Publisher: American Chemical Society (ACS)
Date: 03-08-2015
DOI: 10.1021/CR400607Y
Publisher: American Chemical Society (ACS)
Date: 24-10-2017
DOI: 10.1021/ACS.LANGMUIR.7B03100
Abstract: Surface properties such as topography and chemistry affect the motion of the three-phase contact line (solid/liquid/air), which in turn affects the contact angle of a liquid moving on a solid surface. In this work, the motion of the receding water contact line was studied on chemically and topographically patterned surfaces obtained from the dewetting of thin polymer films. The patterned surfaces consisted of hydrophilic poly(4-vinylpyridine) (P4VP) bumps, which were either microsized and sparse or nanosized and dense, on top of a hydrophobic polystyrene (PS) background layer. These patterns are designed for atmospheric water capture, for which the easy roll off of water droplets is crucial to their efficient performance. The dynamic receding water contact angle and contact line height of the patterned surfaces were measured by vertically withdrawing the surfaces from a water bath and compared to those of a flat P4VP substrate. For both the micropatterned and nanopatterned surfaces, the height of the dynamic contact lines normalized by the capillary length was characterized by the equilibrium limit that was predicted from static states. The nanopatterned surface had a faster increase in the normalized height as the capillary number increased. The dynamic receding contact angles on all surfaces studied decreased with increasing withdrawing velocity. Surprisingly, even for these patterned surfaces with high hysteresis, the dynamic receding contact angle followed the Cox-Voinov relation at capillary numbers of between 1 × 10
Publisher: American Chemical Society (ACS)
Date: 09-08-2012
DOI: 10.1021/LA302627N
Abstract: Nanoparticles have been applied into the construction of micro- and nanoscaled surface structures with extreme wettability over the past few years. However, the details of processing and employing colloidal nanosuspensions for this purpose have not yet been fully investigated. In this work, we study the surface structures formed via nanosuspensions, in which nanoparticles of solid phase are presented, and the caused surface wettability. We disperse silica nanoparticles with different sizes into pure ethanol to prepare nanosuspensions with a series of concentrations. The suspensions are ultrasonically processed to prompt uniform distribution of nanoparticles before application. The deposited nanosuspensions are thermally treated to assist the regulation of surface patterns based on nanoparticles. Hence, the investigation explores a variety of experimental conditions that will lead to distinctive surface structures and wettabilities. Accordingly, the wettability of the induced surfaces is investigated using contact angle measurement, and the structures of those surfaces are mainly revealed by atomic force microscopy (AFM). Superhydrophilicity is observed on many of such formed surfaces, and the pattern of surface structures in micro- and nanoscale is closely related to the processing conditions and the size of nanoparticles. Thus, we report the characteristics of the surface patterns based on nanoparticles and the formed wettability.
Publisher: Springer Science and Business Media LLC
Date: 12-2010
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.CIS.2011.08.005
Abstract: A typical superhydrophobic (ultrahydrophobic) surface can repel water droplets from wetting itself, and the contact angle of a water droplet resting on a superhydrophobic surface is greater than 150°, which means extremely low wettability is achievable on superhydrophobic surfaces. Many superhydrophobic surfaces (both manmade and natural) normally exhibit micro- or nanosized roughness as well as hierarchical structure, which somehow can influence the surface's water repellence. As the research into superhydrophobic surfaces goes deeper and wider, it is becoming more important to both academic fields and industrial applications. In this work, the most recent progress in preparing manmade superhydrophobic surfaces through a variety of methodologies, particularly within the past several years, and the fundamental theories of wetting phenomena related to superhydrophobic surfaces are reviewed. We also discuss the perspective of natural superhydrophobic surfaces utilized as mimicking models. The discussion focuses on how the superhydrophobic property is promoted on solid surfaces and emphasizes the effect of surface roughness and structure in particular. This review aims to enable researchers to perceive the inner principles of wetting phenomena and employ suitable methods for creation and modification of superhydrophobic surfaces.
Publisher: Wiley
Date: 27-06-2014
Publisher: Wiley
Date: 2023
DOI: 10.1002/DRO2.42
Abstract: The friction force opposing the onset of motion of a drop on a solid surface is typically considered to be a material property for a fixed drop volume on a given surface. However, here we show that even for a fixed drop volume, the static friction force can be tuned by over 30% by preshaping the drop. The static friction usually exceeds the kinetic friction that the drop experiences when moving in a steady state. Both forces converge when the drop is prestretched in the direction of motion or when the drop shows low contact angle hysteresis. In contrast to static friction, kinetic friction is independent of preshaping the drop, that is, the drop history. Kinetic friction forces reflect the material properties.
Publisher: Springer Science and Business Media LLC
Date: 06-11-2017
DOI: 10.1038/NPHYS4305
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Nan Gao.