Evaluation of the surface properties of PTFE foam coating filter media using XPS and contact angle measurements

Park, Byung Hyun; Lee, Myong‐Hwa; Kim, Sang Bum; Jo, Young Min

doi:10.1016/j.apsusc.2010.11.116

Cited by 59 publications

(29 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5,6 The nanostructure of the solid surface has an important influence on its hydrophobicity. 7 In addition, because of the interest in designing microfluidic systems, the nanowetting properties of surfaces are attracting increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of wetting behavior of water droplets on polytetrafluorethylene surfaces

Chen

Wang

et al. 2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

Molecular dynamics simulations are performed to simulate the wetting behavior of nanosized water droplets on flat and pillar polytetrafluorethylene surfaces. The results show that the cutoff of the Lennard-Jones (LJ) potential has a large effect on the simulated value of the contact angle and some suggestions are given on how to choose an appropriate cutoff. On flat surfaces, the contact angle is independent of the size of the water droplet, which was determined by the energy parameters of the LJ potential. Furthermore, on pillar surfaces, two different equilibrium states are present: wetted contact and cross contact. For the wetted contact state, the contact angle increases with increasing droplet size and pillar size within a certain range. However, for the cross contact state, the contact angle and droplet size are uncorrelated, which results from the layering and structuring of molecules after their penetration into the hollows between pillars. However, additional simulations show that the final state depends on the initial geometry and the cross contact state is a metastable wetting state.

show abstract

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of wetting behavior of water droplets on polytetrafluorethylene surfaces

Chen

Wang

et al. 2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…That is, the overall pressure drop increases with dust loading on the filter surface and the residual pressure drop depends on the attractive force between a fiber and a particle. Even if the PG filter is relatively thick, it has high filter cleaning efficiency due to the low surface free energy of the filter medium (Park et al, 2011). The de-dusting behavior is more clearly examined in next section.…”

Section: Filter Cleaning By Back-flushingmentioning

confidence: 99%

Filtration Characteristics of Fine Particulate Matters in a PTFE/Glass Composite Bag Filter

Park

Kim

et al. 2012

Aerosol Air Qual. Res.

Self Cite

View full text Add to dashboard Cite

Bag houses are often used to control particulate matters and recover valuable resources in various industries. A bag filter is the most important component in a bag house system, and thus it is important to develop the best-quality filter media and determine the optimum operating conditions of a bag house system. This study focused on particle penetrations under an operating condition of a bag house system, and investigated the relationship between dust clogging and dust penetration as a function of pressure drops across the filter medium. The results showed a minimum collection efficiency of 80% for 0.45 μm particles at the initial stage of filtration, although this quickly recovered and remained over 99.99% with a pressure drop greater than 20 mmH 2 O with a newly developed porous filter (air permeability = 5.78 × 10 −11 m 2 ). Furthermore, the recovery time depended strongly on particle size. While it was inversely proportional to the particle size at the initial stage of filtration, it showed no difference for particles larger than 0.725 μm due to its uniform dust cake as filter cleaning proceeded.

show abstract

“…Furthermore, peak fitting analysis of C 1s is also investigated to characterize the modification of F8261 on the LT surface. The results of Figure show that there are multiple carbon states with different energies existed in the modified LT, especially the CF 3 (294.0 eV) and CF 2 (291.9 eV) . They are not detected in the untreated LT powders.…”

Section: Resultsmentioning

confidence: 92%

“…Contact angle analysis was conducted to investigate the surface characteristic of modified and untreated LT powders. As depicted in Figure , the XPS survey scan reveals five main elements, namely lithium, carbon, titanium, oxygen, and fluorine . Compared to the unmodified LT powders, fluorine element is found in the treated LT.…”

Section: Resultsmentioning

confidence: 95%

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Wang

Tong³

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this work, we presented a simple strategy to fabricate medium dielectric constant and low-loss composites for microwave substrate applications. MgO-LiF co-doped Li 2 TiO 3 (LT) powders were fabricated by the solid-state reaction route and modified by perfluorooctyltriethoxysilane (F8261). The LT/polytetrafluoroethylene (PTFE) composites were fabricated by cold pressing and hot treatment. The XPS and contact angle analysis indicated that the fluorinated group was introduced to LT particle successfully. The effects of modified LT powders content on the dielectric, thermal, and mechanical properties of composites were investigated. As the modified LT content increases, the dielectric constant, dielectric loss, and temperature coefficient of dielectric constant (τ ε ) increase while the bending strength and coefficient of thermal expansion (CTE) decrease, which is attributed to the higher dielectric constant of LT ceramic, more pores, stable τ ε of LT ceramic, interface defects and low CTE of LT ceramic, respectively. The composites with 60 wt % LT exhibit the best microwave dielectric properties: ε r = 6.8, tanδ = 0.001, τ ε = −29.6 ppm C −1 at 8 GHz and acceptable coefficient of thermal expansion (28.3 ppm C −1 ). Therefore, modified LT powders filled PTFE composites are potential materials for high-frequency microwave substrate applications.

show abstract

Evaluation of the surface properties of PTFE foam coating filter media using XPS and contact angle measurements

Cited by 59 publications

References 13 publications

Molecular dynamics simulations of wetting behavior of water droplets on polytetrafluorethylene surfaces

Molecular dynamics simulations of wetting behavior of water droplets on polytetrafluorethylene surfaces

Filtration Characteristics of Fine Particulate Matters in a PTFE/Glass Composite Bag Filter

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Contact Info

Product

Resources

About

Evaluation of the surface properties of PTFE foam coating filter media using XPS and contact angle measurements

Cited by 59 publications

References 13 publications

Molecular dynamics simulations of wetting behavior of water droplets on polytetrafluorethylene surfaces

Molecular dynamics simulations of wetting behavior of water droplets on polytetrafluorethylene surfaces

Filtration Characteristics of Fine Particulate Matters in a PTFE/Glass Composite Bag Filter

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li2TiO3 particles

Contact Info

Product

Resources

About

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles