Flow Effects on the Surface Properties of Surfactant Foam Films

2021 ◽  
Author(s):  
Zhicheng Ye ◽  
Jie Yang ◽  
Haiping Su ◽  
Cheng Lian ◽  
Yazhuo Shang ◽  
...  
Keyword(s):  
Surface Properties ◽  
Foam Films ◽  
Electrostatic Properties ◽  
Flow Effects ◽  
The Stability ◽  
Liquid Foam

The surface electrostatic properties of the liquid foam, involving the electrokinetic (EK) phenomena in the liquid-gas interface, have significant effects on the stability of foam. Here, we established a theoretical...

scholarly journals Effect of polyelectrolytes on (de)stability of liquid foam films

Soft Matter ◽  
2014 ◽  
Vol 10 (36) ◽  
pp. 6903-6916 ◽  
Author(s):  
Heiko Fauser ◽  
Regine von Klitzing
Keyword(s):  
Film Surface ◽  
Complex Interplay ◽  
Foam Films ◽  
The Stability ◽  
Liquid Foam

The review addresses the complex interplay between the film surface and core properties on the stability of polylectrolyte–surfactant foam films.

scholarly journals Stability of dental implants with sandblasted and acid-etched (SLA) and modified (SLActive) surfaces during the osseointegration period

2021 ◽  
Vol 15 (4) ◽  
pp. 226-231
Author(s):  
Gulsum Sayin Ozel ◽  
Ozgur Inan ◽  
Asli Secilmis Acar ◽  
Gamze Alniacik Iyidogan ◽  
Dogan Dolanmaz ◽  
...  
Keyword(s):  
Dental Implants ◽  
Surface Properties ◽  
Resonance Frequency Analysis ◽  
Implant Stability ◽  
Osteoprogenitor Cells ◽  
Implant Placement ◽  
Modified Surfaces ◽  
Surface Measurements ◽  
The Stability ◽  
Over Time

Background. The surface properties of implants are effective factors for increasing the osseointegration and activity of osteoprogenitor cells. This study compared the stability of dental implants with sandblasted and acid-etched (SLA) and modified surfaces (SLActive) using the resonance frequency analysis (RFA). Methods. In a split-mouth design, 50 dental implants with either SLA surface properties (n=25) or modified (SLActive) surface properties (n=25) were placed in the mandibles of 12 patients with a bilateral posterior edentulous area. Implant stability was measured using RFA (Osstell) at implant placement time and every week for 1, 2, and 3 months before the conventional loading time. Results. One week following the implantation, implant stability increased from 70 to 77.67 for SLA and from 71.67 to 79 for SLActive (P<0.05). Stability improved each week except in the 4th week in SLActive surface measurements. No significant differences were observed between the groups at 2 and 3 months (P>0.05). Conclusions. For both implant surfaces, increased stability was observed over time, with no significant differences between the groups.

Importance of bacterial surface properties to control the stability of emulsions

2006 ◽  
Vol 112 (1) ◽  
pp. 26-34 ◽  
Author(s):  
Mai Huong Ly ◽  
Murielle Naïtali-Bouchez ◽  
Thierry Meylheuc ◽  
Marie-Noëlle Bellon-Fontaine ◽  
Thanh Mai Le ◽  
...  
Keyword(s):  
Surface Properties ◽  
Bacterial Surface ◽  
The Stability

Surface Properties of TiN Films on AZ 31 Magnesium Alloys Deposited by Magnetron Sputtering Technique

2011 ◽  
Vol 314-316 ◽  
pp. 53-57 ◽  
Author(s):  
Xiang Rong Zhu ◽  
Nai Ci Bing ◽  
Zhong Ling Wei ◽  
Qiu Rong Chen
Keyword(s):  
Magnetron Sputtering ◽  
Surface Properties ◽  
Structural Defects ◽  
Micro Hardness ◽  
Dense Structure ◽  
Tin Films ◽  
Tin Film ◽  
Indentation Experiment ◽  
The Stability ◽  
Electronic Microscope

TiN films were deposited on the AZ 31 magnesium alloy substrates by d.c. magnetron sputtering technique. The surface properties of the films were investigated. The scanning electronic microscope observations reveal the dense structure characteristics of as-deposited TiN films. Under 200°C heat treatment for 30 minutes or 4 times’ heat cycles at 85°C for one hour, no structural defects such as cracks are observed on the surface of the films. Adhesion experiment further demonstrates the stability of the film and the strong combination between the film and the substrate. Nano-indentation experiment shows that the average micro-hardness of TiN film reaches 23.85 Gpa. Finally, the corrosion experiments in simulated body fluid initially reveal the degradation property of TiN film.

LIQUID FOAM DRAINAGE: AN OVERVIEW

2008 ◽  
Vol 22 (15) ◽  
pp. 2333-2354 ◽  
Author(s):  
QICHENG SUN ◽  
LIANGHUI TAN ◽  
GUANGQIAN WANG
Keyword(s):  
Surfactant Solution ◽  
Two Dimensions ◽  
Limiting Factors ◽  
Liquid Foams ◽  
Measuring Techniques ◽  
Substantial Progress ◽  
The Stability ◽  
Liquid Foam ◽  
Concentrated Dispersions ◽  
Foam Drainage

Liquid foams are concentrated dispersions of gas bubbles in a small amount of surfactant solution, which are perpetually out of equilibrium systems. The process of liquid draining through networks of Plateau borders in a fresh foam is so-called foam drainage, as a result of both gravitational and capillary forces, which has great effect on the stability of foams. From the view of foam physics and dynamics, this paper briefly introduces foam structure and major lifetime limiting factors of foam. The substantial progress on the theory of drainage, measuring techniques for liquid fractions, drainage in both one dimension and two dimensions, and drainage in microgravity circumstances are overviewed throughout. Remaining tasks are discussed and a multiscale methodology for foam drainage is proposed for future investigations.

Effect of post-synthesis treatment on the stability and surface properties of MCM-48 silica

2005 ◽  
Vol 83 (1-3) ◽  
pp. 172-180 ◽  
Author(s):  
Anne Galarneau ◽  
Marie-France Driole ◽  
Carolina Petitto ◽  
Bich Chiche ◽  
Barbara Bonelli ◽  
...  
Keyword(s):  
Surface Properties ◽  
The Stability ◽  
Post Synthesis

scholarly journals Response of a Turbofan Engine Compression System to Disturbed Inlet Conditions

1996 ◽  
Author(s):  
Adnan M. Abdel-Fattah
Keyword(s):  
Inlet Temperature ◽  
Nasa Lewis Research ◽  
Flow Distortion ◽  
Temperature Ramps ◽  
Inlet Conditions ◽  
Flow Effects ◽  
The Stability ◽  
Full Face ◽  
Real Flow ◽  
Pressure Compressor

A generic code DYNTECC has been adapted to perform a parametric study of the effect of inlet flow distortion on the stability of the Pratt and Whitney TF30 engine. This code was developed at Arnold Engineering Development Center, USA, for single and dual spool systems. It was modified at AMRL to accommodate the particular geometry of the TF30 engine. The stage characteristics needed to operate DYNTECC were derived from experimental data for the fan and low pressure compressor. For the high pressure compressor they were derived using the STGSTK code developed at NASA Lewis Research Center. This program was modified at AMRL to include real flow effects that were in turn derived using yet another adapted code CASCAD. The code was primarily used at AMRL to predict the onset of system instability due to simulated full-face rapid inlet temperature ramps typical of those caused during armament firings. It was also run with sinusoidal total pressure oscillations of varying amplitudes and frequencies at the inlet. The code predictions were compared with available data whenever possible, and were found to be consistent with the observed experimental trends.

scholarly journals Porous surfaces: stability and recovery of coronaviruses

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Lucy Owen ◽  
Maitreyi Shivkumar ◽  
Richard B. M. Cross ◽  
Katie Laird
Keyword(s):  
Surface Properties ◽  
Close Contact ◽  
Indirect Contact ◽  
Indirect Transmission ◽  
Hydrophobic Materials ◽  
Porous Surfaces ◽  
Potential Risks ◽  
The Stability ◽  
Review Current

The role of indirect contact in the transmission of SARS-CoV-2 is not clear. SARS-CoV-2 persists on dry surfaces for hours to days; published studies have largely focused on hard surfaces with less research being conducted on different porous surfaces, such as textiles. Understanding the potential risks of indirect transmission of COVID-19 is useful for settings where there is close contact with textiles, including healthcare, manufacturing and retail environments. This article aims to review current research on porous surfaces in relation to their potential as fomites of coronaviruses compared to non-porous surfaces. Current methodologies for assessing the stability and recovery of coronaviruses from surfaces are also explored. Coronaviruses are often less stable on porous surfaces than non-porous surfaces, for example, SARS-CoV-2 persists for 0.5 h–5 days on paper and 3–21 days on plastic; however, stability is dependent on the type of surface. In particular, the surface properties of textiles differ widely depending on their construction, leading to variation in the stability of coronaviruses, with longer persistence on more hydrophobic materials such as polyester (1–3 days) compared to highly absorbent cotton (2 h–4 days). These findings should be considered where there is close contact with potentially contaminated textiles.

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