Bio-Droplets Self-Mixing by Pattern Surface

2005 ◽  
Author(s):  
Chih-Sheng Yu ◽  
Ming-Yu Lin ◽  
Yi-Chiuen Hu ◽  
Heng-Tsang Hu ◽  
Hsiao-Yu Chou
Keyword(s):  
Surface Tension ◽  
Mixing Time ◽  
Hydrophobic Surface ◽  
Hysteresis Effect ◽  
Protein Absorption ◽  
Hydrophobic Behavior ◽  
Self Motion

In this paper, we characterize a gradient of surface tension by patterning surface that containing radiative texture and hydrophobic behavior. The protein absorption is a challenge on the hydrophobic surface; we describe a method to manipulate the blood-droplet moving on the hydrophobic surface without stick effect. The phenomenon of droplet self-motion is due to hysteresis effect that triggered the droplet to move with a velocity of about 20mm/s. Mixing of two droplets is experimentally in this device and mixing time less than ten seconds.

Determination of the Cation Exchange Capacity of Clays by Surface Tension Measurements

Clay Minerals ◽  
1993 ◽  
Vol 28 (3) ◽  
pp. 475-481 ◽  
Author(s):  
G. Burrafato ◽  
F. Miano
Keyword(s):  
Surface Tension ◽  
Cation Exchange ◽  
Clay Minerals ◽  
Cation Exchange Capacity ◽  
Mixing Time ◽  
Aqueous Suspension ◽  
Exchange Capacity ◽  
Drilling Fluids ◽  
Accurate Analysis

AbstractThe cation exchange capacity (CEC) of clay minerals has been determined by titration of aqueous suspension of clays with hexadecylpyridinium chloride, monitored using surface tension measurements. In order to make the method suitable for an accurate analysis of the CEC of the clays in drilling fluids or in soils, some parameters affecting the CEC determination (e.g. the presence of carboxymethylcellulose, mixing time and measurement device) have been investigated.

scholarly journals Quantitative Estimation of the Parameters for Self-Motion Driven by Difference in Surface Tension

Langmuir ◽  
2014 ◽  
Vol 30 (27) ◽  
pp. 8101-8108 ◽  
Author(s):  
Nobuhiko J. Suematsu ◽  
Tomohiro Sasaki ◽  
Satoshi Nakata ◽  
Hiroyuki Kitahata
Keyword(s):  
Surface Tension ◽  
Quantitative Estimation ◽  
Self Motion

scholarly journals The parotid secretory protein BPIFA2 is a salivary surfactant that affects LPS action

2020 ◽  
Author(s):  
Seshagiri R. Nandula ◽  
Ian Huxford ◽  
Thomas T. Wheeler ◽  
Conrado Aparicio ◽  
Sven-Ulrik Gorr
Keyword(s):  
Surface Tension ◽  
Systemic Disease ◽  
Physiological Role ◽  
Hydrophobic Surface ◽  
Secretory Protein ◽  
Salivary Protein ◽  
Lipid Binding ◽  
Wild Type ◽  
Parotid Secretory Protein ◽  
Dry Food

AbstractSaliva plays important roles in the mastication, swallowing and digestion of food, speech and lubrication of oral mucosa, antimicrobial and anti-inflammatory activity and control of body temperature in grooming animals. The salivary protein BPIFA2 (BPI fold containing family A member 2; former names: Parotid Secretory Protein, PSP, SPLUNC2, C20orf70) is related to lipid-binding and LPS-binding proteins expressed in mucosa. Indeed, BPIFA2 binds LPS but the physiological role of BPIFA2 remains to be determined. To address this question, Bpifa2 knockout (Bpifa2tm1(KOMP)Vlcg) (KO) mice were phenotyped with a special emphasis on saliva and salivary glands. Saliva collected from KO mice was less able to spread on a hydrophobic surface than wild-type saliva and the surface tension of KO saliva was close to that of water. These data suggest that BPIFA2 is a salivary surfactant that is mainly responsible for the low surface tension of mouse saliva. The reduced surfactant activity of KO saliva did not affect consumption of dry food or grooming, but saliva from KO mice contained less LPS than wild-type saliva. Indeed, mice lacking BPIFA2 responded to ingested LPS with an increased stool frequency, suggesting that BPIFA2 plays a role in the solubilization and activity of ingested LPS. Consistent with these findings, BPIFA2-depleted mice also showed increased insulin secretion and metabolomic changes that were consistent with a mild endotoxemia. These results support the distal physiological function of a salivary protein and reinforce the connection between oral biology and systemic disease.

Relationship between Atmospheric Humidity and Watermark Formation in IPA Dry of Si Wafer after HF Clean

2009 ◽  
Vol 145-146 ◽  
pp. 91-94 ◽  
Author(s):  
N. Kurumoto ◽  
Atsuro Eitoku ◽  
Katsuhiko Miya
Keyword(s):  
Surface Tension ◽  
Oxygen Concentration ◽  
Hydrophobic Surface ◽  
Critical Dimension ◽  
Significant Problem ◽  
Cleaning Process ◽  
Low Oxygen ◽  
Atmospheric Humidity ◽  
Low Oxygen Concentration ◽  
Si Wafer

As the critical dimension of LSI continues to decrease, the surface tension of water and its effect on the formation of watermarks is becoming a significant problem. It is known that watermarks are easily generated when a silicon hydrophobic surface is dried in a wet cleaning process. Many studies about watermarks have been reported [1, 2]. Additionally if the rinse and dry steps were performed under an inert (nitrogen) ambient and the rinse water had low oxygen concentration, watermarks could be effectively avoided [3, 4].

A large-scale approach for superhydrophobic coating fabrication

2020 ◽  
pp. 095440542097804
Author(s):  
Ali Ansari ◽  
Nourooz Mohammad Nouri ◽  
Setareh Sekhavat ◽  
Ali Asgari
Keyword(s):  
Contact Angle ◽  
Particle Size ◽  
Large Scale ◽  
Mixing Time ◽  
Hydrophobic Surface ◽  
Angle Measurement ◽  
Particle Size Range ◽  
Water Contact ◽  
Weight Percentage ◽  
Hydrophobic Coating

Marine structures such as ships, oil platforms, and oceanographic systems are permanently at risk of fouling affecting the performance of these structures. Antifouling paints were used to address the concerns associated to marine organisms, but they release toxic materials. This paper presents a new one-step environmentally friendly super hydrophobic coating considering the effect of particle size as well as weight percentage which is feasible in large-scale applications. Firstly, the aluminum flakes are become hydrophobic using silanization method. Then, they are mixed with polyester triglycidyl isocyanurate (TGIC) and are sprayed electrostatically. To assess the fabricated surfaces, effect of mixing time, weight percentage and particle size on the super hydrophobicity are evaluated using scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), contact angle measurement, and image processing. This method leads to a super hydrophobic coating with water contact angle about 152°. The super hydrophobic surface with particle size less than 45 µm results in higher resistance to algae settlement providing an excellent antifouling feature. The uniformity resulted from the particle size range 0–45 µm prevents any micro organisms settlement on the surface so that, after sixth day only some tiny algae are appeared on the surface sides.

scholarly journals Impingement, coalescence and mixing of micro-droplets on a solid surface

2021 ◽  
Author(s):  
Guina Yi ◽  
Ziqi Cai ◽  
Zhengming Gao ◽  
Jos Derksen
Keyword(s):  
Numerical Simulation ◽  
Solid Surface ◽  
Weber Number ◽  
Mixing Time ◽  
Hydrophobic Surface ◽  
Hydrophilic Surface ◽  
Mixing Process ◽  
Ohnesorge Number ◽  
Sessile Droplet ◽  
Diffusion Stage

The coalescence of an impinging droplet colliding with a sessile droplet at an angle(θi) is investigated by numerical simulation. The range of θi is 0° - 60° and the surface wettability are set as hydrophilic or hydrophobic, and both of them can affect the droplet mergence behavior. By using a modified mixing function, the dimensionless total mixing time τm can be calculated. The results show that there is no clear effect of θi on τm on a hydrophobic surface, while τm increases as θi increases on the hydrophilic surface. With the Weber number(We) ranging from 5.65 to 22.7 and the Ohnesorge number(Oh) ranging from 0.136 to 0.214, we find τm hardly changes with We and Oh. By dividing the mergence and mixing process in a convection and a diffusion stage, we find that the diffusion is much larger than the convection time.

Temperature Dependence of the Contact Angle of Water on a Hydrophobic Surface at Pressurized Condition

2020 ◽  
Author(s):  
Jia-Wen Song ◽  
Meng-Chen Ma ◽  
Li-Wu Fan
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Temperature Dependence ◽  
Sessile Drop ◽  
Hydrophobic Surface ◽  
Contact Angles ◽  
Surface Wettability ◽  
Surface Thermodynamics ◽  
Temperature Spectrum ◽  
Phase Change Heat Transfer

Abstract It is of both practical and scientific significance to study the temperature dependence of contact angles, towards development of surface wettability manipulation techniques for enhanced phase change heat transfer as well as the theoretical estimation of solid interfacial energy. However, the variations of surface wettability of a hydrophobic solid with altering temperature remain unclear. In this work, in situ characterizations of the contact angle of water on Teflon (PTFE) surfaces as well as the surface tension of water over a temperature spectrum from ∼25 °C to 160 °C at pressurized condition (2 MPa) were conducted by employing the sessile drop and pendant drop methods, respectively. A nearly invariant trend of the contact angle of water was observed over the entire temperature range. Moreover, it was shown that the surface tension of water linearly declines with raising the temperature. Based on the theory of surface thermodynamics, the effects of temperature on the contact angles were analyzed with the variations of interfacial tensions.

scholarly journals Study on the droplet impact on hydrophobic surface in terms of van der Waals surface tension model

2015 ◽  
Vol 64 (11) ◽  
pp. 114701
Author(s):  
Bai Ling ◽  
Li Da-Ming ◽  
Li Yan-Qing ◽  
Wang Zhi-Chao ◽  
Li Yang-Yang
Keyword(s):  
Surface Tension ◽  
Van Der Waals ◽  
Hydrophobic Surface ◽  
Droplet Impact ◽  
Van Der Waals Surface ◽  
Surface Tension Model

scholarly journals 3D numerical investigation of effects of density and surface tension on mixing time in bottom-blown gas-stirred ladles

2021 ◽  
Vol 31 (10) ◽  
pp. 3177-3191
Author(s):  
Matin GHADIMI REZAEI ◽  
Pooyan HASHEMI TARI ◽  
Mohammad EMAMZADEH ◽  
Leili TAFAGHODI KHAJAVI
Keyword(s):  
Surface Tension ◽  
Numerical Investigation ◽  
Mixing Time ◽  
Effects Of Density

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

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