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Sessile drop technique

About: Sessile drop technique is a research topic. Over the lifetime, 2827 publications have been published within this topic receiving 68943 citations.


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Journal ArticleDOI
Yun Bai1, Candace E. Wall1, Hannah Pham1, Alan R. Esker1, Christopher B. Williams1 
TL;DR: In this paper, the authors proposed an experimental approach based on sessile drop goniometry on a powder substrate to characterize the binder wetting powder process. But the method was limited to binder-powder interaction and primitive formation.
Abstract: Understanding the binder–powder interaction and primitive formation is critical to advancing the binder jetting Additive Manufacturing process and improving the accuracy, precision, and mechanical properties of the printed parts. In this work, the authors propose an experimental approach based on sessile drop goniometry on a powder substrate to characterize the binder wetting powder process. As a binder drop penetrates into a prepared powder substrate, the dynamic contact angle formed in powder pores is calculated based on the measured binder penetration time, and the binder penetration depth is measured from the binder-powder granule retrieved from the powder substrate. Coupled with models of capillary flow, the technique provides a fundamental understanding of the binder–powder interaction that determines the material compatibility and printing parameters in binder jetting. Enabled by this gained understanding, it was determined that suspending nanoparticles in a binder could increase the capillary-driven penetration depth, which was then reduced by the further increase of the nanoparticle solid loading and resultant binder viscosity.

57 citations

Journal ArticleDOI
TL;DR: In this paper, stable and hydrophobic self-assembled monolayers (SAMs) were formed on an oxidized copper (Cu) surface via reaction with 1H,1H,2H,3H,4H,5H,6H-perfluorodecyldimethylchlorosilane (PFMS).
Abstract: Formation of stable and hydrophobic self-assembled monolayers (SAMs) on an oxidized copper (Cu) surface has been accomplished via reaction with 1H,1H,2H,2H-perfluorodecyldimethylchlorosilane (PFMS). The perfluoroalkyl SAMs showed sessile drop static contact angles of more than 125° for pure water and stability against exposure to boiling water, boiling nitric acid solution, and warm sodium hydroxide solution for up to 30 min. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared reflection/absorption spectroscopy (FT-IRRAS) data reveal a coordination of the PFMS silicon (Si) atom with a cuprate (CuO) molecule present on the oxidized copper substrate. The data give good evidence that the stability of the SAM film on the PFMS-modified oxidized Cu surface is largely due to the formation of a siloxy−copper (−Si−O−Cu−) bond via a condensation reaction between silanol (−Si−OH) and copper hydroxide (−CuOH). The extremely hydrophobic and stable SAMs on oxidized Cu could have useful applications in...

57 citations

Journal ArticleDOI
Abstract: The surface tensions (σ) and temperature dependencies (dσ/dT) of several commercial 4-series ferritic stainless steels have been measured using the sessile drop technique on an Al2O3 plate over the temperature range 1789 to 1883 K in an atmosphere of high purity (P O 2 < 10−19 MPa) argon gas. Precise densities of liquid stainless steels have also been obtained using the modified sessile drop method in order to calculate accurate values of the surface tension. The surface tensions of liquid stainless steels decreased markedly with increasing sulphur concentration in the steels. The variation of surface tensions of liquid stainless steels can be described by the following equation σ = 1790 − 182 ln (1 + 260a S) (mN/m) when only S is considered or σ = 1820 − 304 ln (1 + 383a O) − 182ln (1 + 260a S) (mN/m) when both S and O are considered. The equations apply to the following compositional ranges: mass%O = 0.0022–0.0064, mass%S = 0.0008–0.05. The temperature coefficient of the surface tension (dσ/dT) of liquid stainless steel was found to change from negative to positive at a sulphur concentration of about 30 mass ppm in the steel. Nitrogen was found to have little effect on the surface tension of liquid stainless steel.

57 citations

Journal ArticleDOI
TL;DR: In this article, the surface and interfacial properties of a proposed lead-free solder material, the In-31.6Bi-19.6Sn system, were studied on a copper substrate at different reflow temperatures.

57 citations

Journal ArticleDOI
TL;DR: The numerical analysis and the mesh discretization method confirmed that fluid velocity profiles inside the drop are influenced by the evaporation flux profiles along the drop interface.

56 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202354
2022106
202189
2020105
2019100
2018116