Reply to the ‘Comment on “Size dependence of bubble wetting on surfaces: breakdown of contact angle match between small sized bubbles and droplets”’ by A. I. Rusanov, D. V. Tatyanenko and A. K. Shchekin, Nanoscale, 2020, DOI:10.1039/D0NR00232A

Nanoscale ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 4311-4313
Author(s):  
Hongguang Zhang ◽  
Xianren Zhang
Keyword(s):  
Contact Angle ◽  
Size Dependence ◽  
The Difference ◽  
Angle Match

In this Reply, we clarify the rationale behind our conclusions and point out that in their derivation Rusanov et al. failed to consider the difference between bubbles and droplets.

Comment on “Size dependence of bubble wetting on surfaces: breakdown of contact angle match between small sized bubbles and droplets” by H. Zhang and X. Zhang, Nanoscale, 2019, 11, 2823

Nanoscale ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 4308-4310 ◽  
Author(s):  
Anatoly I. Rusanov ◽  
Dmitry V. Tatyanenko ◽  
Alexander K. Shchekin
Keyword(s):  
Contact Angle ◽  
Size Dependence ◽  
Line Tension ◽  
Angle Size ◽  
Simulation Results ◽  
Angle Match

The theoretical arguments of the paper commented contain errors and cannot explain the simulation results. We suggest that line tension and adsorptions at interfaces may be responsible for a difference in the contact angle size dependencies for droplets and bubbles.

Size dependence of bubble wetting on surfaces: breakdown of contact angle match between small sized bubbles and droplets

Nanoscale ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 2823-2828 ◽  
Author(s):  
Hongguang Zhang ◽  
Xianren Zhang
Keyword(s):  
Contact Angle ◽  
Size Dependence ◽  
Contact Angles ◽  
Size Dependent ◽  
Angle Match ◽  
Wetting Behaviors ◽  
Small Bubbles

Bubbles show size-dependent wetting behaviors and contact angles for small bubbles are no longer supplementary to those of droplets.

Beneficiation of Seafloor Massive Sulfides by Liquid-Liquid Extraction

2021 ◽  
pp. 1-35
Author(s):  
Yasuharu Nakajima ◽  
Yuta Yamabe ◽  
Toyohisa Fujita ◽  
Gjergj Dodbiba
Keyword(s):  
Aqueous Solution ◽  
Contact Angle ◽  
High Pressures ◽  
Sulfide Mineral ◽  
Contact Angles ◽  
Liquid Extraction ◽  
Massive Sulfides ◽  
Liquid Liquid Extraction ◽  
Pressure Extraction ◽  
The Difference

Abstract This paper addresses the applicability of liquid-liquid extraction for separating mineral particles by the difference in oil-water partition coefficient, for the seafloor mineral processing of Seafloor Massive Sulfides (SMSs). Measurements of contact angle of sulfide mineral – aqueous solution – oil systems under high-pressure conditions were performed to evaluate the efficiency of liquid-liquid extraction at high pressures. The results showed that the contact angle stayed around 80 - 100° at the pressure range up to 16MPa; and the changes in the contact angles were within 5° with varying pressure. Extraction experiments were carried out by using particles of an SMS ore, which contained Zinc (Zn), Lead (Pb), and Barium (Ba) in the grade of more than 10 mass% and Copper (Cu) in a small percentage, to evaluate the beneficiation performance of liquid-liquid extraction. In the experiments, extraction conditions such as the dosage of chemical reagents, and pH in the aqueous solution were varied to optimize both the recovery and selectivity of Cu, Zn, and Pb in the oil phase, and those of Ba in the water phase. The experimental results showed that the optimum condition was 200 g/t dosage - pH 7, where the grade and recovery were ca. 37 mass% and ca. 90 mass%, respectively. The beneficiation performance of liquid-liquid extraction would be comparable to that of flotation, adapted to the processing of other SMS ores.

Influence of TiO2 on Selfclean Bio Coating

2013 ◽  
Vol 315 ◽  
pp. 399-403 ◽  
Author(s):  
Nurulsaidatulsyida Sulong ◽  
Anika Zafiah Mohd Rus
Keyword(s):  
Contact Angle ◽  
Organic Contaminants ◽  
Concrete Surface ◽  
Waste Cooking Oil ◽  
Water Repellent ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
The Difference ◽  
Micro Features ◽  
Coated Surfaces

Treatment on the exposed surface to the environmental attack was studied based on biopolymer coating from waste cooking oil doped with a superhydrophilic filler of Titanium Dioxide (TiO2), known as TOP. TOP was found to affect the physical properties of the coated concrete surface in a systematic way. Contact angle measurements are interpreted with respect to nanoand micro-features existing on the surface of the water repellent superhydrophilic filler filled bio-polymer composite coating. The smooth coated surfaces of polymer filled or doped with superhydrophobic filler shows the systematic increasing static Waste Contact Angle, WCA (θst) and revealed that polymer filled superhydrophobic fillers by only 2.0 % shows the ability to form superhydrophobicity property. Scanning Electron Microscope (SEM) pictures revealed the difference between the concrete surface roughness of concrete biopolymer with and without TOP coating is to provide self-cleaning concrete biopolymer coating based on two principal ways: (1) the development of surface coating of semiconducting photocatalytic superhydrophilic. (2) If such a superhydrophilic is illuminated by light, then grease, dirt and organic contaminants will be decomposed and can easily be swept away by rain.

scholarly journals Examination of Adsorption Orientation of Amyloidogenic Peptides Over Nano-Gold Colloidal Particle Surfaces

2019 ◽  
Vol 20 (21) ◽  
pp. 5354 ◽  
Author(s):  
Kazushige Yokoyama ◽  
Kieran Brown ◽  
Peter Shevlin ◽  
Jack Jenkins ◽  
Elizabeth D’Ambrosio ◽  
...  
Keyword(s):  
Charge Distribution ◽  
Size Dependence ◽  
Partial Charge ◽  
Gold Colloid ◽  
Gold Colloids ◽  
Nano Gold ◽  
Secondary Layer ◽  
Amyloidogenic Peptides ◽  
The Difference ◽  
Nano Size

The adsorption of amyloidogenic peptides, amyloid beta 1–40 (Aβ1–40), alpha-synuclein (α-syn), and beta 2 microglobulin (β2m), was attempted over the surface of nano-gold colloidal particles, ranging from d = 10 to 100 nm in diameter (d). The spectroscopic inspection between pH 2 and pH 12 successfully extracted the critical pH point (pHo) at which the color change of the amyloidogenic peptide-coated nano-gold colloids occurred due to aggregation of the nano-gold colloids. The change in surface property caused by the degree of peptide coverage was hypothesized to reflect the ΔpHo, which is the difference in pHo between bare gold colloids and peptide coated gold colloids. The coverage ratio (Θ) for all amyloidogenic peptides over gold colloid of different sizes was extracted by assuming Θ = 0 at ΔpHo = 0. Remarkably, Θ was found to have a nano-gold colloidal size dependence, however, this nano-size dependence was not simply correlated with d. The geometric analysis and simulation of reproducing Θ was conducted by assuming a prolate shape of all amyloidogenic peptides. The simulation concluded that a spiking-out orientation of a prolate was required in order to reproduce the extracted Θ. The involvement of a secondary layer was suggested; this secondary layer was considered to be due to the networking of the peptides. An extracted average distance of networking between adjacent gold colloids supports the binding of peptides as if they are “entangled” and enclosed in an interfacial distance that was found to be approximately 2 nm. The complex nano-size dependence of Θ was explained by available spacing between adjacent prolates. When the secondary layer was formed, Aβ1–40 and α-syn possessed a higher affinity to a partially negative nano-gold colloidal surface. However, β2m peptides tend to interact with each other. This difference was explained by the difference in partial charge distribution over a monomer. Both Aβ1–40 and α-syn are considered to have a partial charge (especially δ+) distribution centering around the prolate axis. The β2m, however, possesses a distorted charge distribution. For a lower Θ (i.e., Θ <0.5), a prolate was assumed to conduct a gyration motion, maintaining the spiking-out orientation to fill in the unoccupied space with a tilting angle ranging between 5° and 58° depending on the nano-scale and peptide coated to the gold colloid.

scholarly journals An Improvement in Preparation of Mortar for Radiocarbon Dating

Radiocarbon ◽  
2001 ◽  
Vol 43 (2A) ◽  
pp. 271-273 ◽  
Author(s):  
E Sonninen ◽  
H Jungner
Keyword(s):  
Grain Size ◽  
Radiocarbon Dating ◽  
Size Dependence ◽  
Reaction Rates ◽  
Error Source ◽  
Rate Of Reaction ◽  
The Matrix ◽  
The Difference

An error source in radiocarbon dating of ancient mortar is dead carbon of limestone mixed in the matrix. To eliminate the influence of limestone the difference in feasibility to react with acid between mortar and limestone is used. Since the rate of reaction depends on grain size use of a well-defined grain size can give a better separation between mortar and limestone. We present results for the grain size dependence of reaction rates for several mortar and limestone samples and discuss the application for dating.

scholarly journals Poly (Dimethylsiloxane) Coating for Repellency of Polar and Non-Polar Liquids

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2423
Author(s):  
Hila Monder ◽  
Leo Bielenki ◽  
Hanna Dodiuk ◽  
Anna Dotan ◽  
Samuel Kenig
Keyword(s):  
Contact Angle ◽  
Empirical Model ◽  
Room Temperature ◽  
Contact Angle Hysteresis ◽  
Dielectric Constants ◽  
Solubility Parameters ◽  
Polar Liquids ◽  
The Difference ◽  
Liquid Repellency ◽  
Pdms Coating

The wettability of poly (dimethylsiloxane) (PDMS) coating on plasma-treated glass was studied at room temperature using polar and non-polar liquids. The wettability was investigated regarding the liquids’ surface tensions (STs), dielectric constants (DCs) and solubility parameters (SPs). For polar liquids, the contact angle (CA) and contact angle hysteresis (CAH) are controlled by the DCs and non-polar liquids by the liquids’ STs. Solubility parameter difference between the PDMS and the liquids demonstrated that non-polar liquids possessed lower CAH. An empirical model that integrates the interfacial properties of liquid/PDMS has been composed. Accordingly, the difference between the SPs of PDMS and the liquid is the decisive factor affecting CAH, followed by the differences in DCs and STs. Moreover, the interaction between the DCs and the SPs is of importance to minimize CAH. It has been concluded that CAH, and not CA, is the decisive attribute for liquid repellency of PDMS coating.

Lens size dependence of contact angle and the line tension of the dodecane-water-air system

1997 ◽  
Vol 129-130 ◽  
pp. 45-60 ◽  
Author(s):  
P. Chen ◽  
S.S. Susnar ◽  
C. Mak ◽  
A. Amirfazli ◽  
A.W. Neumann
Keyword(s):  
Contact Angle ◽  
Size Dependence ◽  
Line Tension ◽  
Air System

Drop Size Dependence of the Contact Angle of Nanodroplets

2005 ◽  
Vol 22 (4) ◽  
pp. 787-790 ◽  
Author(s):  
Guo Hong-Kai ◽  
Fang Hai-Ping
Keyword(s):  
Contact Angle ◽  
Drop Size ◽  
Size Dependence ◽  
Drop Size Dependence
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