scholarly journals Gradient wettability induced by deterministically patterned nanostructures

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Siyi Min ◽  
Shijie Li ◽  
Zhouyang Zhu ◽  
Wei Li ◽  
Xin Tang ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Large Scale ◽  
High Strength ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Wetting Behavior ◽  
Measurement Results ◽  
Facile Fabrication ◽  
Mold Fabrication ◽  
Wetting Model

AbstractWe report a large-scale surface with continuously varying wettability induced by ordered gradient nanostructures. The gradient pattern is generated from nonuniform interference lithography by utilizing the Gaussian-shaped intensity distribution of two coherent laser beams. We also develop a facile fabrication method to directly transfer a photoresist pattern into an ultraviolet (UV)-cured high-strength replication molding material, which eliminates the need for high-cost reactive ion etching and e-beam evaporation during the mold fabrication process. This facile mold is then used for the reproducible production of surfaces with gradient wettability using thermal-nanoimprint lithography (NIL). In addition, the wetting behavior of water droplets on the surface with the gradient nanostructures and therefore gradient wettability is investigated. A hybrid wetting model is proposed and theoretically captures the contact angle measurement results, shedding light on the wetting behavior of a liquid on structures patterned at the nanoscale.

Nanomechanical Properties and Surface Wettability of Carbon Films Prepared by Magnetron Sputtering

2014 ◽  
Vol 609-610 ◽  
pp. 357-361
Author(s):  
Wei Wei An ◽  
Xiao Li Zhao ◽  
Le Gu ◽  
Run Zhou Su
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Magnetron Sputtering ◽  
Contact Angle Measurement ◽  
Carbon Films ◽  
Angle Measurement ◽  
Surface Wettability ◽  
Nanomechanical Properties ◽  
A Value ◽  
Measurement Results

In this work, carbon films were deposited by magnetron sputtering on silicon substrate. The effect of sputtering time on the surface wettability and mechanical properties of carbon films was investigated. Contact angle measurement was used to analyse surface wettability, and the nanomechanical properties were characterized by nanoindentation. In experiments, the sputtering time was 45 min, 60 min, 75 min and 90 min. The measurement results show that the maximum film hardness was achieved for sputtering time 90 min, with a value of 2.34 GPa. Longer sputtering time resulted in preferable mechanical properties. It was analyzed that the size of the crystal grains on the substrate surface and thickness of the films were increased with the increment of sputtering time. The surface roughness decreased with the increase of sputtering time. Moreover, Youngs modulus increased with sputtering time and the maximum value was 16.94 GPa. The contact angle measurement results show that the prepared films take on the hydrophilicity. The minimum contact angle was achieved for sputtering time 45 min with a value of 54o.

scholarly journals Activation of Sphalerite by Ammoniacal Copper Solution in Froth Flotation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Xian Xie ◽  
Kai Hou ◽  
Bo Yang ◽  
Xiong Tong
Keyword(s):  
Photoelectron Spectroscopy ◽  
Copper Sulphate ◽  
Separation Efficiency ◽  
Froth Flotation ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Activation Effect ◽  
X Ray ◽  
Copper Solution ◽  
Measurement Results

The activation of sphalerite particles by ammoniacal copper solution (ACS) was investigated in this study. This microflotation study was conducted on a single sphalerite mineral with the particles size of 38 μm to 75 μm. Results showed that ACS has somewhat better activation effect than copper sulphate (a traditional activator) with sodium isobutyl xanthate as the collector. Agglomeration observation, contact angle measurement, and X-ray photoelectron spectroscopy measurement results of sphalerite particles verified the superiority of this new activator. Therefore, the substitution of copper sulphate with ACS would increase the separation efficiency not only in marmatite flotation but also in sphalerite flotation.

Replication and Surface Treatment of Micro Pattern Generated by Entanglement of Nanowires

2020 ◽  
Vol 12 (3) ◽  
pp. 403-406
Author(s):  
Seonjun Kim ◽  
Young Tae Cho
Keyword(s):  
Nanoimprint Lithography ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Surface Treatments ◽  
Control Surface ◽  
Ozone Treatment ◽  
Polymer Resin ◽  
Lithography Process ◽  
Micro Patterning ◽  
Micro Pattern

In this study, a nano-micro pattern was fabricated by a nanoimprint lithography process using a porous material, particularly anodic aluminum oxide (AAO), and polymer resin. The fabricated mold consisted of a group of nanowires forming a bundle and showing a specific micro pattern. The structures were subjected to various surface treatments to control surface conditions and wettability. UV-Ozone treatment and octadecyltrichlorosilane (OTS) coating were used as surface treatments. Through these surface treatments, the surface energy of the fabricated structure was lowered, and as a result, it could be used as a mold for nano-micro patterning. The final product was also fabricated through a nanoimprint lithography process, and the reverse image of the mold was duplicated. The surface of each structure was observed by scanning electron microscopy (SEM) and the surface properties were examined by contact angle measurement.

scholarly journals Transfer Durability of Line-Patterned Replica Mold Made of High-Hardness UV-Curable Resin

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1956
Author(s):  
Tetsuma Marumo ◽  
Shin Hiwasa ◽  
Jun Taniguchi
Keyword(s):  
Contact Angle ◽  
Nanoimprint Lithography ◽  
High Hardness ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Line Pattern ◽  
Uv Curable ◽  
High Durability ◽  
Uv Curable Resin ◽  
Line Patterns

Ultraviolet nanoimprint lithography (UV-NIL) requires high durability of the mold for the mass production of nanostructures. To evaluate the durability of a line-patterned replica mold made of high-hardness UV curable resin, repetitive transfer and contact angle measurements of the replica mold were carried out. In the line patterns, as the contact angle decreases due to repeated transfer, capillary action occurs, and water flows along them. Therefore, it can be said that a mold with a line pattern exhibits an anisotropic contact angle because these values vary depending on the direction of the contact angle measurement. Subsequently, these anisotropic characteristics were investigated. It was determined that it was possible to predict the lifetime of line-and-space molds over repeated transfers. As the transcription was repeated, the contact angle along the line patterns decreased significantly before becoming constant. Moreover, the contact angle across the line pattern decreased slowly while maintaining a high contact angle with respect to the contact angle along the line pattern. The contact angle then decreased linearly from approximately 90°. The mold was found to be macroscopically defect when the values of the contact angle along the line pattern and the contact angle across the line pattern were close. Predicting the mold’s lifetime could potentially lead to a shortened durability evaluation time and the avoidance of pattern defects.

Surface Modification of Titanium Alloys Using Alumina Particles Blasting for Biomedical Applications

2014 ◽  
Vol 983 ◽  
pp. 135-140 ◽  
Author(s):  
Suparat Udomlertpreecha ◽  
Prasit Pavasant ◽  
Boonrat Lohwongwatana
Keyword(s):  
Titanium Alloys ◽  
Biomedical Applications ◽  
Biomedical Application ◽  
High Strength ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Nominal Composition ◽  
Average Particle ◽  
Significant Difference ◽  
Alumina Particles

Ti-based bulk metallic glass (BMG) is a new class of titanium alloys that exhibits excellent properties for biomedical applications. They have high strength, good corrosion resistance, low elastic modulus and satisfactory biocompatibility. Therefore, Ti-based BMG is an excellent alternative material to be used in biomedical application. Titanium alloy with a nominal composition of the Ti40Zr10Co36Pd14 was synthesized by replacing Cu with Co in a better-known bulk glass forming composition. Coin-shape samples with a diameter of 15 mm and thickness of 1 mm were prepared by arc-melting and casting into copper mold. The coin-shape samples were polished, then followed by blasting with 50 μm and 250 μm average particle sizes of alumina. Alumina blasting caused plastic deformation at the surface and induced change in surface roughness. The larger size of alumina particle, the higher the Ra, Rq and Rt with significant difference. Some abrasive alumina particles were found to be embedded onto the blasted surface. The blasted Ti40Zr10Co36Pd14 sample showed lower roughness values than those blasted Ti-6Al-4V samples. This may be because of the higher hardness values of Ti40Zr10Co36Pd14 sample, when compared to the softer Ti-6Al-4V samples. The contact angle measurement which demonstrated wettability of all samples did not show significant difference in a tested range of Ra (from 40 to 428 nm).

Investigation of the Accuracy of Reference Instruments for Measuring Vertical Angles by Reference Method of Their Calibration

2020 ◽  
pp. 3-14
Author(s):  
O. M. Samoylenko ◽  
O. V. Adamenko ◽  
B. P. Kukareka
Keyword(s):  
Horizontal Plane ◽  
Opposite Sign ◽  
Reference Method ◽  
Angle Measurement ◽  
Measurement Standard ◽  
Vertical Angle ◽  
Measurement Standards ◽  
Measurement Results ◽  
Electronic Measurement ◽  
Systematic Biases

Reference method for simultaneous calibration of the three and more measurement standards for vertical angle measurement is developed. This method can to use for obtaining the systematic biases of the vertical angles measurements for each of the measuring standards relative of the horizontal plain was averaged from measurement results in time their calibration or comparison. For realization of the reference method was developed the autocollimationel electronic measurement standard for the automatization measurement of the vertical angles SeaLineZero_Standard™ (SLZ_S™). Summary standard deviation (k=1) of the vertical angle measurement relative the horizontal plane, from the results of their calibration by reference method, is not more 0,07ʺ…0,15ʺ. This result was obtained without the use the systematic biases, for each measurement standards, as measurements corrections (with opposite sign). The measuring standards, that were developed and researched, are necessary for obtaining the systematic biases of the vertical angle measurement for total stations and theodolites, that have the normed standard error 0,5ʺ and 1ʺ, when these instruments are calibrating.

scholarly journals Inverse Infiltration Modeling of Dike Covers Made of Dredged Material Using PEST and AMALGAM

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 41
Author(s):  
Tim Jurisch ◽  
Stefan Cantré ◽  
Fokke Saathoff
Keyword(s):  
Large Scale ◽  
Measurement Data ◽  
Fine Grained ◽  
Dredged Materials ◽  
Measurement Results ◽  
Large Scale Field ◽  
Eigenvalue Ratio ◽  
Ill Posed ◽  
Materials Used ◽  
Installation Technology

A variety of studies recently proved the applicability of different dried, fine-grained dredged materials as replacement material for erosion-resistant sea dike covers. In Rostock, Germany, a large-scale field experiment was conducted, in which different dredged materials were tested with regard to installation technology, stability, turf development, infiltration, and erosion resistance. The infiltration experiments to study the development of a seepage line in the dike body showed unexpected measurement results. Due to the high complexity of the problem, standard geo-hydraulic models proved to be unable to analyze these results. Therefore, different methods of inverse infiltration modeling were applied, such as the parameter estimation tool (PEST) and the AMALGAM algorithm. In the paper, the two approaches are compared and discussed. A sensitivity analysis proved the presumption of a non-linear model behavior for the infiltration problem and the Eigenvalue ratio indicates that the dike infiltration is an ill-posed problem. Although this complicates the inverse modeling (e.g., termination in local minima), parameter sets close to an optimum were found with both the PEST and the AMALGAM algorithms. Together with the field measurement data, this information supports the rating of the effective material properties of the applied dredged materials used as dike cover material.

scholarly journals Superhydrophobic functionalized cellulosic paper by copper hydroxide nanorods for oils purification

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmed S. Belal ◽  
Jehan El Nady ◽  
Azza Shokry ◽  
Shaker Ebrahim ◽  
Moataz Soliman ◽  
...  
Keyword(s):  
Contact Angle ◽  
Filter Paper ◽  
Separation Efficiency ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Absorption Capacity ◽  
Morphological Properties ◽  
Copper Hydroxide ◽  
Immersion Method ◽  
Water Contact

AbstractOily water contamination has been sighted as one of the most global environmental pollution. Herein, copper hydroxide nanorods layer was constructed onto cellulosic filter paper surface cured with polydopamine, Ag nanoparticles, and Cu NPs through immersion method. This work has been aimed to produce a superhydrophobic and superoleophilic cellulosic filter paper. The structure, crystalline, and morphological properties of these modified cellulosic filter paper were investigated. Scanning electron microscope images confirmed that the modified surface was rougher compared with the pristine surface. The contact angle measurement confirmed the hydrophobic nature of these modified surfaces with a water contact angle of 169.7°. The absorption capacity was 8.2 g/g for diesel oil and the separation efficiency was higher than 99%. It was noted that the flux in the case of low viscosity solvent as n-hexane was 9663.5 Lm−2 h−1, while for the viscous oil as diesel was 1452.7 Lm−2 h−1.

scholarly journals Progress in Research on Carbon Nanotubes Reinforced Cementitious Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Qinghua Li ◽  
Jintao Liu ◽  
Shilang Xu
Keyword(s):  
Carbon Nanotubes ◽  
Large Scale ◽  
High Strength ◽  
Cementitious Composites ◽  
Scale Production ◽  
Multiwalled Carbon ◽  
Factors Affecting ◽  
Environment And Health ◽  
Research Activities ◽  
Major Factors

As one-dimensional (1D) nanofiber, carbon nanotubes (CNTs) have been widely used to improve the performance of nanocomposites due to their high strength, small dimensions, and remarkable physical properties. Progress in the field of CNTs presents a potential opportunity to enhance cementitious composites at the nanoscale. In this review, current research activities and key advances on multiwalled carbon nanotubes (MWCNTs) reinforced cementitious composites are summarized, including the effect of MWCNTs on modulus of elasticity, porosity, fracture, and mechanical and microstructure properties of cement-based composites. The issues about the improvement mechanisms, MWCNTs dispersion methods, and the major factors affecting the mechanical properties of composites are discussed. In addition, large-scale production methods of MWCNTs and the effects of CNTs on environment and health are also summarized.

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