A New Approach for Optimization of Electrospun PAN Nanofi ber Diameter and Contact Angle

2014 ◽  
pp. 197-214
Keyword(s):  
Contact Angle ◽  
New Approach

A NEW APPROACH TO INVESTIGATE CONTACT ANGLE HYSTERESIS

2018 ◽  
Author(s):  
Qiao Liu ◽  
Abbasali Abouei Mehrizi ◽  
Hao Wang
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
New Approach

scholarly journals A New Approach for Solving Rub-Impact Dynamic Characteristics of Shrouded Blades Based on Macroslip Friction Model

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Guofang Nan ◽  
Jianyang Lou ◽  
Chuanchong Song ◽  
Min Tang
Keyword(s):  
Contact Angle ◽  
Vibration Amplitude ◽  
Research Work ◽  
Friction Model ◽  
Rotating Machinery ◽  
Equivalent Stiffness ◽  
Normal Contact ◽  
New Approach ◽  
Damping Characteristics ◽  
The Impact

Based on the macroslip friction model, a new dynamic model of the shrouded blades for rotating machinery is developed to study the impact vibration between the adjacent blades. Unlike the traditional analytical method of the shrouded blade based on the simple Coulomb friction model, a new approach is developed that the macroslip friction model is used to represent a more accurate rubbing behavior (more closer to reality) between the shrouds. By means of the harmonic balance method, the friction force and the normal pressure are translated into the equivalent stiffness and the equivalent damping. The Galerkin method is adopted to reduce the dimension of the equation to obtain the 1-DOF equation of motion, and the dynamic response of the shrouded blade is solved by Runge–Kutta numerical method. The effects of parameters such as the gap of shrouds, the mass of the tip, the contact angle, and the normal stiffness between the shrouded blades on the damping characteristics are discussed. The results show that the gap of tips has a significant effect on the vibration amplitude of the blade. Within a certain range, with the decrease of the gap, the amplitude of the blade tip is getting smaller while the resonant speed is increasing. The mass of the shroud has little effect on the damping characteristics, while the contact angle has a great influence on the equivalent stiffness and damping. Increasing the contact angle to a certain extent can effectively reduce the vibration amplitude of the blade, and the normal contact stiffness also has an important influence in reducing the vibration. The research results based on the new method in this paper are compared with the published articles and agree well. The research work is important to the accurate calculations and design and control of the shrouded blades for rotating machinery.

scholarly journals Directed Hierarchical Patterning of Polycarbonate Bisphenol A Glass Surface along Predictable Sites

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Mazen Khaled
Keyword(s):  
Contact Angle ◽  
Bisphenol A ◽  
Exposure Time ◽  
Optical Transmittance ◽  
Solar Panels ◽  
New Approach ◽  
Structured Surfaces ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Transparent Composite

This paper reports a new approach in designing textured and hierarchical surfaces on polycarbonate bisphenol A type glass to improve hydrophobicity and dust repellent application for solar panels. Solvent- and vapor-induced crystallization of thermoplastic glass polycarbonate bisphenol A (PC) is carried out to create hierarchically structured surfaces. In this approach dichloromethane (DCM) and acetone are used in sequence. Samples are initially immersed in DCM liquid to generate nanopores, followed by exposing to acetone vapor resulting in the generation of hierarchical structure along the interporous sites. The effects of exposure time on the size, density, and distance of the generated spherules and gaps are studied and correlated with the optical transmittance and contact angle measurements at the surface. At optimized exposure time a contact angle of 98° was achieved with 80% optical transmittance. To further increase the hydrophobicity while maintaining optical properties, the hierarchical surfaces were coated with a transparent composite of tetraethyl orthosilicate as precursor and hexamethyldisilazane as silylation agent resulting in an average contact angle of 135.8° and transmittance of around 70%. FTIR and AFM characterization techniques are employed to study the composition and morphology of the generated surfaces.

scholarly journals Contact angle and adsorption energies of nanoparticles at the air–liquid interface determined by neutron reflectivity and molecular dynamics

Nanoscale ◽  
2015 ◽  
Vol 7 (13) ◽  
pp. 5665-5673 ◽  
Author(s):  
Javier Reguera ◽  
Evgeniy Ponomarev ◽  
Thomas Geue ◽  
Francesco Stellacci ◽  
Fernando Bresme ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Contact Angle ◽  
Contact Angles ◽  
Liquid Interface ◽  
Neutron Reflectivity ◽  
New Approach ◽  
Adsorption Energies ◽  
Air Liquid Interface

A new approach, based on in situ neutron reflectivity and molecular dynamics has been developed for calculating contact angles of nanoparticles at interfaces.

Effect of Nanofillers on the Spreading Behavior of Biopolymer Materials on Urea Surface

2014 ◽  
Vol 625 ◽  
pp. 907-910
Author(s):  
Yon Norasyikin Samsudin ◽  
Nurul Izzaty Faizzen Zulkefely ◽  
Sohibatul Muizzah Mohamad Izhar ◽  
Ku Zilati Ku Shaari
Keyword(s):  
Contact Angle ◽  
Controlled Release ◽  
Ccd Camera ◽  
Coating Material ◽  
Impact Behavior ◽  
Optical Contact ◽  
New Approach ◽  
Controlled Release Fertilizer ◽  
Spreading Behavior ◽  
Maximum Spreading

This paper presented new approach where a new modified biopolymer reinforced with bentonite nanoclay is developed and used as the coating material for controlled-release fertilizer. Good wettability properties between coating material and urea surface is necessary to provide uniformity during the coating process of controlled release fertilizer. Seven different blending ratio of modified biopolymer solutions are prepared and evaluated for their wettability properties. The wettability properties measured include the surface tension, contact angle and maximum spreading diameter. Optical Contact Angle device comes with a Charged-Coupled Device (CCD) camera was used to capture every single image of the droplet impact behavior. From the analysis, it is proven that with addition of 2% nanoclay filler reinforced into modified biopolymer with blending ratio of 50/15/2.5/7.5 has the best wettability properties and provides better spreading behavior.

DESIGN OF MULTIPOINT ANTI-KICKBACK FINGERS FOR WOODWORKING MACHINES

2000 ◽  
Vol 24 (1A) ◽  
pp. 45-59
Author(s):  
S. Massé
Keyword(s):  
Contact Angle ◽  
Graphical Method ◽  
Design Method ◽  
Single Point ◽  
Furniture Industry ◽  
New Approach ◽  
Wide Range ◽  
Main Factors ◽  
Design Projects ◽  
Pass Through

The main factors involved in the design of anti-kickback fingers is in the contact angle at the point of contact with the wood, the radius of wear at this point, and the roughness of the wood with which it comes in contact. Because of the wide range of wood thicknesses that pass through a machine, conventional single-point fingers cannot come in contact with the wood at angles appropriate for each of these thicknesses. The use of many points ensures that a suitable contact angle is achieved for all thicknesses of wood for each machine. The results of two anti-kickback finger design projects, one for a machine in the furniture industry and the other for a machine in a sawmill resulted in a new analytical design method for efficient multipoint anti-kickback fingers. This new approach, as opposed to the conventional graphical method, was validated by comparing three specific cases; the advantages of the new method are illustrated in an example of the redesign of multipoint anti-kickback fingers.

A new approach to influence contact angle and surface free energy of resin-based dental restorative materials

2011 ◽  
Vol 7 (3) ◽  
pp. 1160-1165 ◽  
Author(s):  
Stefan Rüttermann ◽  
Taina Trellenkamp ◽  
Nora Bergmann ◽  
Wolfgang H.-M. Raab ◽  
Helmut Ritter ◽  
...  
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
New Approach ◽  
Dental Restorative Materials ◽  
Restorative Materials ◽  
Dental Restorative

A Versatile Approach for Biomaterial Patterning: Masked Ion Beam Lithography

2001 ◽  
Vol 705 ◽  
Author(s):  
Kenneth E. Gonsalves ◽  
Wei He ◽  
David B. Poker ◽  
Nikola Batina ◽  
Lhadi Merhari
Keyword(s):  
Contact Angle ◽  
Ion Implantation ◽  
Ion Beam ◽  
Surface Hydrophobicity ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Model System ◽  
Pmma Film ◽  
New Approach ◽  
Ion Beam Lithography

AbstractWe describe a new approach for biomaterial patterning, viz, masked ion beam lithography. Poly (methyl methacrylate) (PMMA) film was used as a model system and subjected to Ca+ and P+ ion implantations through masks. Ca+ ion implantation was performed at an energy of 85 keV with a fluence of 1×1014 ions/cm2. P+ ion implantation was done at an energy of 85 keV with fluences of 1×1015 and 1×1016 ions/cm2. Arrays of holes were generated during these processes. AFM showed that the depth of the holes is in the nanoscale region. The surface hydrophobicity of the exposed PMMA films was investigated by contact angle measurement. The results indicated that ion implantation changed the surface hydrophobicity.

Sign in / Sign up

Export Citation Format

Share Document