Silicone Surface Fundamentals

Owen, Michael J.

doi:10.1002/marc.202000360

Cited by 23 publications

(10 citation statements)

References 60 publications

(88 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to this limit, DCDMS‐functionalization (dimethyl, Figure 3a) demonstrates a super‐liquid‐repellency down to ≈ 32–33 mN m −1 . Performance contrast (Figure 3a,b) between the dimethyl (─CH 3 ) 2 and monomethyl (─CH 3 ) variants (DCDMS vs TCMS) reveals the importance of packing functional methyl groups [ 53 ] at the molecular level (thus also increasing organic loading), particularly under similar degrees of grafting (see Supplementary Discussion, "Performance Limits: TCMS and DCDMS", Supporting Information). The performance of dimethyl silicone vs perfluoroalkyl (see below) is attributed to the near‐matching of effective surface energy (dimethyl silicone: 19–21 mJ m −2 [ 41 ] vs perfluoroalkyl: 11–19 mJ m −2 .…”

Section: Resultsmentioning

confidence: 99%

“…For the vapor-functionalized variant, two phases of degradation exist: 1) a volatile component (phase I) which accounts for up to 5% w/w drop until 300 °C and 2) a nonvolatile component that is stable (phase II) until between 400-500 °C (Figure 2c). This volatile component is likely comprised of loose oligomeric chains, [53] which is notably common for chemical vapor functionalized nanoparticles (Figures S5 and S6, Supporting Information).…”

Section: Mechanism: Silicone-on-nanoparticle Growth (Self-assembly)mentioning

confidence: 99%

“…The removal of very minute volatile components (<5% w/w) did not lead to degradation in compositional or wetting properties. In fact, performance was marginally improved, as heating is known (but rarely reported [20,53] ) to improve interfacial chain alignment due to increased molecular mobility. Super-liquid-repellency is thus attributed to the nonvolatile components composed of dimethyl silicone.…”

Section: Mechanism: Silicone-on-nanoparticle Growth (Self-assembly)mentioning

confidence: 99%

See 2 more Smart Citations

Design of Fluoro‐Free Surfaces Super‐Repellent to Low‐Surface‐Tension Liquids

et al. 2023

View full text Add to dashboard Cite

Super‐liquid‐repellent surfaces feature high liquid contact angles and low sliding angles find key applications in anti‐fouling and self‐cleaning. While repellency for water is easily achieved with hydrocarbon functionalities, repellency for many low‐surface‐tension liquids (down to 30 mN m−1) still requires perfluoroalkyls (a persistent environmental pollutant and bioaccumulation hazard). Here, the scalable room‐temperature synthesis of stochastic nanoparticle surfaces with fluoro‐free moieties is investigated. Silicone (dimethyl and monomethyl) and hydrocarbon surface chemistries are benchmarked against perfluoroalkyls, assessed using model low‐surface‐tension liquids (ethanol–water mixtures). It is discovered that both hydrocarbon‐ and dimethyl‐silicone‐based functionalization can achieve super‐liquid‐repellency down to 40–41 mN m−1 and 32–33 mN m−1, respectively (vs 27–32 mN m−1 for perfluoroalkyls). The dimethyl silicone variant demonstrates superior fluoro‐free liquid repellency likely due to its denser dimethyl molecular configuration. It is shown that perfluoroalkyls are not necessary for many real‐world scenarios requiring super‐liquid‐repellency. Effective super‐repellency of different surface chemistries against different liquids can be adequately predicted using empirically verified phase diagrams. These findings encourage a liquid‐centric design, i.e., tailoring surfaces for target liquid properties. Herein, key guidelines are provided for achieving functional yet sustainably designed super‐liquid‐repellency.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Mechanism: Silicone-on-nanoparticle Growth (Self-assembly)mentioning

confidence: 99%

Section: Mechanism: Silicone-on-nanoparticle Growth (Self-assembly)mentioning

confidence: 99%

See 1 more Smart Citation

Design of Fluoro‐Free Surfaces Super‐Repellent to Low‐Surface‐Tension Liquids

et al. 2023

View full text Add to dashboard Cite

show abstract

“…When the PDMS is oxidized by air plasma inside of the chamber, hydrocarbons are etched, leaving behind surface silanol groups, resulting in a hydrophilic surface. When placed in contact with an oxidized glass surface, bridged siloxane bonds are formed at the interface, creating the seal [46]. This seal, however, has the tendency to fail with increasing pressures applied to the chip from external syringe or HPLC pumps.…”

Section: Discussionmentioning

confidence: 99%

Development of a Microfluidic Platform for Trace Lipid Analysis

Davic

Cascio

2021

Metabolites

View full text Add to dashboard Cite

The inherent trace quantity of primary fatty acid amides found in biological systems presents challenges for analytical analysis and quantitation, requiring a highly sensitive detection system. The use of microfluidics provides a green sample preparation and analysis technique through small-volume fluidic flow through micron-sized channels embedded in a polydimethylsiloxane (PDMS) device. Microfluidics provides the potential of having a micro total analysis system where chromatographic separation, fluorescent tagging reactions, and detection are accomplished with no added sample handling. This study describes the development and the optimization of a microfluidic-laser induced fluorescence (LIF) analysis and detection system that can be used for the detection of ultra-trace levels of fluorescently tagged primary fatty acid amines. A PDMS microfluidic device was designed and fabricated to incorporate droplet-based flow. Droplet microfluidics have enabled on-chip fluorescent tagging reactions to be performed quickly and efficiently, with no additional sample handling. An optimized LIF optical detection system provided fluorescently tagged primary fatty acid amine detection at sub-fmol levels (436 amol). The use of this LIF detection provides unparalleled sensitivity, with detection limits several orders of magnitude lower than currently employed LC-MS techniques, and might be easily adapted for use as a complementary quantification platform for parallel MS-based omics studies.

show abstract

“…PDMS is the most common silicone polymer [ 25 ]. Its long history of use in virtually all aspects of analytical chemistry—from sampling to final separation—has been extensively reviewed by Seethapathy and Górecki [ 26 ].…”

Section: Pdms As a Sampler Materialsmentioning

confidence: 99%

Silicone Wristbands in Exposure Assessment: Analytical Considerations and Comparison with Other Approaches

Wacławik

Rodzaj

Wielgomas

2022

IJERPH

View full text Add to dashboard Cite

Humans are exposed to numerous potentially harmful chemicals throughout their lifetime. Although many studies have addressed this issue, the data on chronic exposure is still lacking. Hence, there is a growing interest in methods and tools allowing to longitudinally track personal exposure to multiple chemicals via different routes. Since the seminal work by O’Connell et al. (2014), silicone wristbands (WBs) have been increasingly used to facilitate human exposure assessment, as using WBs as a wearable sampler offers new insights into measuring chemical risks involved in many ambient and occupational scenarios. However, the literature lacks a detailed overview regarding methodologies being used; a comprehensive comparison with other approaches of personal exposure assessment is needed as well. Therefore, the aim of this review is fourfold. First, we summarize hitherto conducted research that employed silicone WBs as personal passive samplers. Second, all pre-analytical and analytical steps used to obtain exposure data are discussed. Third, we compare main characteristics of WBs with key features of selected matrices used in exposure assessment, namely urine, blood, hand wipes, active air sampling, and settled dust. Finally, we discuss future needs of research employing silicone WBs. Our work shows a variety of possibilities, advantages, and caveats associated with employment of silicone WBs as personal passive samplers. Although further research is necessary, silicone WBs have already been proven valuable as a tool for longitudinal assessment of personal exposure.

show abstract

Silicone Surface Fundamentals

Cited by 23 publications

References 60 publications

Design of Fluoro‐Free Surfaces Super‐Repellent to Low‐Surface‐Tension Liquids

Design of Fluoro‐Free Surfaces Super‐Repellent to Low‐Surface‐Tension Liquids

Development of a Microfluidic Platform for Trace Lipid Analysis

Silicone Wristbands in Exposure Assessment: Analytical Considerations and Comparison with Other Approaches

Contact Info

Product

Resources

About