scholarly journals Coalescence of droplets on micro-structure patterned hydrophobic planar solid surfaces

RSC Advances ◽  
2017 ◽  
Vol 7 (39) ◽  
pp. 23954-23960 ◽  
Author(s):  
Guiping Zhu ◽  
Hui Fan ◽  
Hulin Huang ◽  
Fei Duan
Keyword(s):  
Surface Properties ◽  
Substrate Surface ◽  
Solid Surfaces ◽  
Liquid Droplets ◽  
Micro Structure

The motion and coalescence of sessile liquid droplets on patterned solid surfaces are investigated systematically in terms of the liquid and substrate surface properties.

Surface Energy and Wettability Study of Flip Chip Packaging Materials

2011 ◽  
Vol 2011 (1) ◽  
pp. 000961-000970
Author(s):  
Jinlin Wang
Keyword(s):  
Surface Energy ◽  
Flip Chip ◽  
Substrate Surface ◽  
Solid Surfaces ◽  
Energy Calculation ◽  
Assembly Process ◽  
Flip Chip Packaging ◽  
Materials Used ◽  
Lead Free Solders ◽  
Ic Package

The surface energy of solid surfaces and surface tension of liquids are important parameters in the IC package assembly process. Wettability analyses have been completed for various materials used in the assembly process of flip chip packages, including underfills, substrates, fluxes, and lead free solders. We will highlight some of these results in this paper. We will focus our discussion on substrate surface energy analysis. A brief discussion of different surface energy methods and the liquid selection criteria will be given. The advantage and limitation of the surface energy calculation methods will be discussed. The data from several case studies will be presented. Our results show that contact angle and surface energy measurements are very useful for quality control and product development where interfacial properties are important.

scholarly journals PLLA Honeycomb-Like Pattern on Fluorinated Ethylene Propylene as a Substrate for Fibroblast Growth

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2436
Author(s):  
Klára Fajstavrová ◽  
Silvie Rimpelová ◽  
Dominik Fajstavr ◽  
Václav Švorčík ◽  
Petr Slepička
Keyword(s):  
Surface Properties ◽  
Substrate Surface ◽  
Surface Wettability ◽  
Material Surface ◽  
Growth Enhancement ◽  
Fibroblast Growth ◽  
Ethylene Propylene ◽  
Preparation Step ◽  
Cell Material Interactions ◽  
Fluorinated Ethylene Propylene

In this study, we present the surface patterning of a biopolymer poly(l-lactide) (PLLA) for fibroblast growth enhancement. The patterning is based on a self-organized pore arrangement directly fabricated from a ternary system of a solvent-nonsolvent biopolymer. We successfully created a porous honeycomb-like pattern (HCP) on a thermally resistant polymer—fluorinated ethylene propylene (FEP). An important preparation step for HCP is activation of the substrate in Ar plasma discharge. The polymer activation leads to changes in the surface chemistry, which corresponds to an increase in the substrate surface wettability. The aim of this study was to evaluate the influence of the PLLA concentration in solution on the surface morphology, roughness, wettability, and chemistry, and subsequently, also on fibroblast proliferation. We confirmed that the amount of PLLA in solution significantly affects the material surface properties. The pore size of the prepared layers, the surface wettability, and the surface oxygen content increased with an increasing amount of biopolymer in the coating solution. The optimal amount was 1 g of PLLA, which resulted in the highest number of cells after 6 days from seeding; however, all three biopolymer concentrations exhibited significantly better results compared to pristine FEP. The cytocompatibility tests showed that the HCP promoted the attachment of cell filopodia to the underlying substrate and, thus, significantly improved the cell–material interactions. We prepared a honeycomb biodegradable support for enhanced cell growth, so the surface properties of perfluoroethylenepropylene were significantly enhanced.

scholarly journals The Potential of a Nanostructured Titanium Oxide Layer with Self-Assembled Monolayers for Biomedical Applications: Surface Properties and Biomechanical Behaviors

2020 ◽  
Vol 10 (2) ◽  
pp. 590 ◽  
Author(s):  
Wen-Chien Lan ◽  
Ta-Sen Huang ◽  
Yung-Chieh Cho ◽  
Yueh-Tzu Huang ◽  
Christopher J. Walinski ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Surface Properties ◽  
Contact Stiffness ◽  
Substrate Surface ◽  
Stress Shielding ◽  
Shielding Effect ◽  
Self Assembled Monolayers ◽  
Nanostructured Titanium ◽  
Assembled Monolayers ◽  
Self Assembled

This study investigated the surface properties and biomechanical behaviors of a nanostructured titanium oxide (TiO) layer with different self-assembled monolayers (SAMs) of phosphonate on the surface of microscope slides. The surface properties of SAMs were analyzed using scanning electron microscopy, X-ray photoemission spectroscopy, and contact angle goniometry. Biomechanical behaviors were evaluated using nanoindentation with a diamond Berkovich indenter. Analytical results indicated that the homogenous nanostructured TiO surface was formed on the substrate surface after the plasma oxidation treatment. As the TiO surface was immersed with 11-phosphonoundecanoic acid solution (PUA-SAM/TiO), the formation of a uniform SAM can be observed on the sample surface. Moreover, the binding energy of O 1s demonstrated the presence of the bisphosphonate monolayer on the SAMs-coated samples. It was also found that the PUA-SAM/TiO sample not only possessed a higher wettability performance, but also exhibited low surface contact stiffness. A SAM surface with a high wettability and low contact stiffness could potentially promote biocompatibility and prevent the formation of a stress shielding effect. Therefore, the self-assembled technology is a promising approach that can be applied to the surface modification of biomedical implants for facilitating bone healing and osseointegration.

Initial bacterial attachment in slow flowing systems: Effects of cell and substrate surface properties

2011 ◽  
Vol 87 (2) ◽  
pp. 415-422 ◽  
Author(s):  
Hua Wang ◽  
Maysam Sodagari ◽  
Yajie Chen ◽  
Xin He ◽  
Bi-min Zhang Newby ◽  
...  
Keyword(s):  
Surface Properties ◽  
Substrate Surface ◽  
Bacterial Attachment
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