scholarly journals Crystal phase engineering of self-catalyzed GaAs nanowires using a RHEED diagram

2020 ◽  
Vol 2 (5) ◽  
pp. 2127-2134 ◽  
Author(s):  
T. Dursap ◽  
M. Vettori ◽  
A. Danescu ◽  
C. Botella ◽  
P. Regreny ◽  
...  
Keyword(s):  
Contact Angle ◽  
Crystalline Structure ◽  
Crystal Phase ◽  
Catalyst Droplet ◽  
Wetting Contact Angle ◽  
Gaas Nanowires ◽  
Phase Engineering

It is well known that the crystalline structure of the III–V nanowires (NWs) is mainly controlled by the wetting contact angle of the catalyst droplet which can be tuned by the III and V flux.

Crystal phase and growth orientation dependence of GaAs nanowires on NixGay seeds via vapor-solid-solid mechanism

2011 ◽  
Vol 99 (8) ◽  
pp. 083114 ◽  
Author(s):  
Ning Han ◽  
Alvin T. Hui ◽  
Fengyun Wang ◽  
Jared J. Hou ◽  
Fei Xiu ◽  
...  
Keyword(s):  
Orientation Dependence ◽  
Crystal Phase ◽  
Growth Orientation ◽  
Gaas Nanowires

Additive Adsorption and Interfacial Characteristics of Nucleate Pool Boiling in Aqueous Surfactant Solutions

2005 ◽  
Vol 127 (7) ◽  
pp. 684-691 ◽  
Author(s):  
Juntao Zhang ◽  
Raj M. Manglik
Keyword(s):  
Contact Angle ◽  
Pure Water ◽  
Pool Boiling ◽  
Dynamic Surface Tension ◽  
Nucleate Pool Boiling ◽  
Dynamic Surface ◽  
Wetting Contact Angle ◽  
Optimum Heat ◽  
Adsorption Desorption ◽  
And Control

Interfacial phenomena and ebullient dynamics in saturated nucleate pool boiling of aqueous solutions of three surfactants that have different molecular weight and ionic nature are experimentally investigated. The additive molecular mobility at interfaces manifests in a dynamic surface tension behavior (surfactant adsorption–desorption at the liquid–vapor interface), and varying surface wetting (contact angle) with concentration (surfactant physisorption at the solid–liquid interface). This tends to change, enhance, and control the boiling behavior significantly, and an optimum heat transfer enhancement is obtained in solutions at or near the critical micelle concentration (CMC) of the surfactant. Furthermore, wettability (contact angle) is observed to be a function of the molecular makeup of the reagent, and shows distinct regions of change along the adsorption isotherm that are associated with the aggregation mode of adsorbed ions at the solid–water interface. This distinguishably alters the ebullience from not only that in pure water, but also between pre- and post-CMC solutions. Increased wetting tends to suppress nucleation and bubble growth, thereby weakening the boiling process.

scholarly journals Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 34 ◽  
Author(s):  
Piotr Szewczyk ◽  
Daniel Ura ◽  
Sara Metwally ◽  
Joanna Knapczyk-Korczak ◽  
Marcin Gajek ◽  
...  
Keyword(s):  
Contact Angle ◽  
Electrospun Fiber ◽  
Three Dimensional ◽  
Contact Angles ◽  
Electrospun Fibers ◽  
Surface Geometry ◽  
Wetting Contact Angle ◽  
Fiber Fraction ◽  
Significant Difference ◽  
Entrapped Air

Wettability of electrospun fibers is one of the key parameters in the biomedical and filtration industry. Within this comprehensive study of contact angles on three-dimensional (3D) meshes made of electrospun fibers and films, from seven types of polymers, we clearly indicated the importance of roughness analysis. Surface chemistry was analyzed with X-ray photoelectron microscopy (XPS) and it showed no significant difference between fibers and films, confirming that the hydrophobic properties of the surfaces can be enhanced by just roughness without any chemical treatment. The surface geometry was determining factor in wetting contact angle analysis on electrospun meshes. We noted that it was very important how the geometry of electrospun surfaces was validated. The commonly used fiber diameter was not necessarily a convincing parameter unless it was correlated with the surface roughness or fraction of fibers or pores. Importantly, this study provides the guidelines to verify the surface free energy decrease with the fiber fraction for the meshes, to validate the changes in wetting contact angles. Eventually, the analysis suggested that meshes could maintain the entrapped air between fibers, decreasing surface free energies for polymers, which increased the contact angle for liquids with surface tension above the critical Wenzel level to maintain the Cassie-Baxter regime for hydrophobic surfaces.

scholarly journals Bistability of Contact Angle and Its Role in Achieving Quantum-Thin Self-Assisted GaAs nanowires

Nano Letters ◽  
2017 ◽  
Vol 18 (1) ◽  
pp. 49-57 ◽  
Author(s):  
Wonjong Kim ◽  
Vladimir G. Dubrovskii ◽  
Jelena Vukajlovic-Plestina ◽  
Gözde Tütüncüoglu ◽  
Luca Francaviglia ◽  
...  
Keyword(s):  
Contact Angle ◽  
Gaas Nanowires

Influence of Silica Sol on the Properties of Cotton Fabric

2014 ◽  
Vol 685 ◽  
pp. 48-50
Author(s):  
Sheng Lu ◽  
De Hong Cheng ◽  
Yan Hua Lu ◽  
Zhi Cai Yu ◽  
Jie Lin
Keyword(s):  
Contact Angle ◽  
Cotton Fabric ◽  
Silica Sol ◽  
Capillary Effect ◽  
Polycarboxylic Acid ◽  
Antistatic Property ◽  
Wetting Contact Angle ◽  
Modification Effect ◽  
Tension Strength ◽  
Better Than

The cotton fabric was modified with polycarboxylic acid, silica sol and KH-550, and the modification effect was characterized by the capillary effect value, tension strength value, antistatic capability value and wetting contact angle. The results showed that the hydrophilic and tension strength of the modified fabrics were much better than those of non-modified ones. But the antistatic property of the modified cotton fabric was slightly lower.

Three-Dimensional Magneto-Photoluminescence as a Probe of the Electronic Properties of Crystal-Phase Quantum Disks in GaAs Nanowires

Nano Letters ◽  
2013 ◽  
Vol 13 (11) ◽  
pp. 5303-5310 ◽  
Author(s):  
Pierre Corfdir ◽  
Barbara Van Hattem ◽  
Emanuele Uccelli ◽  
Sònia Conesa-Boj ◽  
Pierre Lefebvre ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Three Dimensional ◽  
Crystal Phase ◽  
Gaas Nanowires ◽  
Quantum Disks

scholarly journals Cd‐Rich Alloyed CsPb 1‐ x Cd x Br 3 Perovskite Nanorods with Tunable Blue Emission and Fermi Levels Fabricated through Crystal Phase Engineering

2020 ◽  
Vol 7 (15) ◽  
pp. 2000930 ◽  
Author(s):  
Jie Guo ◽  
Yuhao Fu ◽  
Min Lu ◽  
Xiaoyu Zhang ◽  
Stephen V. Kershaw ◽  
...  
Keyword(s):  
Blue Emission ◽  
Crystal Phase ◽  
Phase Engineering
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