Wettability and surface energy of parylene F deposited on PDMS

Han, Bing; Wang, Peng; Jin, Huichao; Hou, Zhi‐Shan; Bai, Xue

doi:10.1016/j.physleta.2020.126628

Cited by 21 publications

(21 citation statements)

References 39 publications

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“…The results of the surface roughness (Sa) measured with CLSM are shown in Table 5. The roughness of the surfaces of a clear PDMS is about Sa = 0.1 µm, which corresponds to the results available in the literature [61,66]. For all the examined composites, Sa value is higher after incubation (Figure 7) and the largest changes are found for samples 70-0 and 70-12 (830 µm) as well as for 0-0 and 0-12 (650 µm).…”

Section: Physicochemical Propertiessupporting

confidence: 86%

“…The results of the water absorption (W) experiments as a function of the incubation time are presented in Figure 6d. The lowest percentage of the change between 0.1-0.2% was observed for a clear PDMS, which is expected to absorb almost no water at all [35,61,65]. Increasing the concentration of MPs correspondingly raised the weight of the composites, especially for 50 wt.% and above, reaching up to 0.6% weight increase for 70 wt.%.…”

Section: Physicochemical Propertiesmentioning

confidence: 95%

“…= 116 • for clear PDMS) [58][59][60], which could be explained by the differences in the fabrication method [61].…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

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The Effect of Physiological Incubation on the Properties of Elastic Magnetic Composites for Soft Biomedical Sensors

Mystkowska

Powojska

Łysik

et al. 2021

Sensors

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Magnetic micro- and nanoparticles (MPs)-based composite materials are widely used in various applications in electronics, biotechnology, and medicine. This group of silicone composites have advantageous magnetic and mechanical properties as well as sufficient flexibility and biocompatibility. These composites can be applied in medicine for biological sensing, drug delivery, tissue engineering, and as remote-controlled microrobots operating in vivo. In this work, the properties of polydimethylsiloxane (PDMS)-based composites with different percentages (30 wt.%, 50 wt.%, 70 wt.%) of NdFeB microparticles as a filler were characterized. The novelty of the work was to determine the influence of the percentage of MP content and physiological conditioning on the properties of the PDMS-MP composites after in vitro incubation. An important essence of the work was a comprehensive study of the properties of materials important from the point of view of medical applications. Materials were tested before and after conditioning in 0.9 wt.% NaCl solution at a temperature of 37 °C. Several studies were carried out, including thermal, physicochemical, and rheological tests. The results show that with an increase of the incubation time, most of the measured thermal and physicochemical parameters decreased. The presence of the magnetic filler, especially at a concentration of 70 wt.%, has a positive effect on thermal stability and physicochemical and rheological properties. The performed tests provided important results, which can lead to further research for a broader application of magnetic composites in the biomedical field.

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Section: Physicochemical Propertiessupporting

confidence: 86%

Section: Physicochemical Propertiesmentioning

confidence: 95%

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The Effect of Physiological Incubation on the Properties of Elastic Magnetic Composites for Soft Biomedical Sensors

Mystkowska

Powojska

Łysik

et al. 2021

Sensors

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“…The enhanced roughness not only enlarges the water contact angles based on the Cassie effect, but also induces the anisotropic surface and different water contact angles in two directions ( Figure 3 B,D). Furthermore, it is facile to calculate the area ratio between the wrinkled surface and flat surface according to this profile [ 12 , 35 , 36 ]. Its value is ~2.7, suggesting that the available separation area has increased significantly.…”

Section: Resultsmentioning

confidence: 99%

Wrinkled CNTs@PLLA Composite Membranes for Enhanced Separation Performance

Chen²,

Yin

et al. 2022

Membranes

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To break the trade-off effect between permeability and selectivity in separation, wrinkled carbon nanotubes@polylactic acid (CNTs@PLLA) composite membranes were successfully fabricated in this work. On pre-deformed PLLA membranes, CNTs were loaded by filtrating their suspension, followed by releasing the PLLA upon heating based on its shape memory effect. The asynchronous deformations of CNTs and PLLA layers produced wrinkled CNTs@PLLA composite membranes. Relative to the reference without wrinkles, the attained wrinkled composite membranes exhibit much higher flux (~12 times) without any loss of rejection ratio during the separation of water-in-hexadecane emulsion. The significant improvement of separation performance can be attributed to the following issues: Firstly, the existence of wrinkles results in higher surface roughness, providing an additional driving force for separation resulting from the enlarged contact-angle difference between water and oil; Secondly, the shrinkage of the supporting PLLA layer during recovery induces the preferred alignment of CNTs along the wrinkle direction, which is the reason for the orientated slit pores with enhanced overlap of neighboring pores in the film-thickness direction; Finally, a wrinkled surface significantly increases the available area for separation. The synergism of the effects discussed above contributes to much higher permeability and comparable selectivity relative to the reference.

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“…Because reliably measuring and estimating γ is difficult for a surface, the calculation may lead to some errors. [ 94 ] In addition, r is obtained from the droplet profile; thus, the precision depends on the measurement tool and operator, which requires good operational skills.…”

Section: Protocol For Conducting Air‐retainability Measurementsmentioning

confidence: 99%

Small Structure, Large Effect: Functional Surfaces Inspired by Salvinia Leaves

et al. 2021

Self Cite

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Nature‐inspired superhydrophobic surfaces have attracted significant attention because of their remarkable properties. In particular, recent findings about the aquatic plant Salvinia provide novel approaches for the application of superhydrophobic surfaces. The unique heterogeneous eggbeater structures endow Salvinia leaves with superhydrophobicity and strong adhesion, which ensures that the leaves show durable air‐retainability in underwater environments. However, the complex eggbeater structures present a difficult manufacturing challenge. Therefore, this review first introduces the air‐retention mechanism, which may benefit the design of Salvinia‐inspired structures. Moreover, advanced techniques including photolithography, direct laser lithography, chemical vapor deposition, electrodeposition, electrostatic flocking, 3D printing, chemical etching, and plasma etching recently have been developed for fabricating Salvinia‐inspired structures. This review focuses on the advantages, disadvantages, and application prospects of such techniques. In addition, the excellent air‐retainability of Salvinia structures has inspired many engineering applications, including drag reduction; water harvesting, evaporation, and repellence; oil/water separation; and thermal insulation. This review discusses the performance and challenges of artificial structures to such applications. Finally, methods of evaluating air‐retainability are discussed. It is expected that this review will not only satisfy scientific curiosity but also contribute to the design and application of Salvinia‐inspired functional surfaces.

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Wettability and surface energy of parylene F deposited on PDMS

Cited by 21 publications

References 39 publications

The Effect of Physiological Incubation on the Properties of Elastic Magnetic Composites for Soft Biomedical Sensors

The Effect of Physiological Incubation on the Properties of Elastic Magnetic Composites for Soft Biomedical Sensors

Wrinkled CNTs@PLLA Composite Membranes for Enhanced Separation Performance

Small Structure, Large Effect: Functional Surfaces Inspired by Salvinia Leaves

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