A cost-effective two-step method for enhancing the hydrophilicity of PDMS surfaces

Slaughter, Gymama; Stevens, Brian

doi:10.1007/s13206-014-8105-3

Cited by 12 publications

(7 citation statements)

References 44 publications

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“…There were also several investigations focused on the development of chemical/physical methods or coatings to mitigate or prevent the partitioning of hydrophobic molecules into PDMS. These methods include oxygen plasma treatment [ 26 ], silanisation [ 27 , 28 , 29 ], synthesis of silica nanoparticles using sol–gel treatments [ 30 , 31 ], and modification with surfactants such as Pluronic [ 32 , 33 ], among others. For example, Meer et al tested the effect of commercial lipophilic coatings to reduce the absorption of hydrophobic molecules by PDMS [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Partitioning of Small Hydrophobic Molecules into Polydimethylsiloxane in Microfluidic Analytical Devices

et al. 2022

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Polydimethylsiloxane (PDMS) is ubiquitously used in microfluidics. However, PDMS is porous and hydrophobic, potentially leading to small molecule partitioning. Although many studies addressed this issue and suggested surface/bulk modifications to overcome it, most were not quantitative, did not address which variables besides hydrophobicity governed molecule absorption, and no modification has been shown to completely obviate it. We evaluated qualitatively (confocal microscopy) and quantitatively (fluorescence spectroscopy) the effects of solute/solvent pairings, concentration, and residence time on molecule partitioning into PDMS. Additionally, we tested previously reported surface/bulk modifications, aiming to determine whether reduced PDMS hydrophobicity was stable and hindered molecule partitioning. Partitioning was more significant at lower concentrations, with the relative concentration of rhodamine-B at 20 µM remaining around 90% vs. 10% at 1 µM. Solute/solvent pairings were demonstrated to be determinant by the dramatically higher partitioning of Nile-red in a PBS-based solvent as opposed to ethanol. A paraffin coating slightly decreased the partitioning of Nile-red, and a sol–gel modification hindered the rhodamine-B diffusion into the PDMS bulk. However, there was no direct correlation between reduced surface hydrophobicity and molecule partitioning. This work highlighted the need for pre-assessing the absorption of test molecules into the microfluidic substrates and considering alternative materials for fabrication.

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Section: Introductionmentioning

confidence: 99%

Partitioning of Small Hydrophobic Molecules into Polydimethylsiloxane in Microfluidic Analytical Devices

et al. 2022

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“…Figure S1 in the Supporting Information illustrates the FTIR spectra of PDMS, PDMS‐10, PDMS‐20 and PDMS‐30 Magpol samples. The peaks at 1415 and 1250 cm −1 are due to CH 3 bond deformation vibrations in PDMS chains . The broad peak at ∼ 1015 cm −1 corresponds to Si–O–Si multi‐component stretching peaks.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks at 1415 and 1250 cm −1 are due to CH 3 bond deformation vibrations in PDMS chains. 39 The broad peak at ∼ 1015 cm −1 corresponds to Si-O-Si multi-component stretching peaks. The small peak at 2906 cm −1 and the intense peak at 2967 cm −1 are due to the -CH 3 symmetric and asymmetric bond stretching in ≡Si-CH 3, respectively.…”

Section: Structural Analysismentioning

confidence: 99%

“…The area of the maximum intense peak shown by Mn 0.8 Zn 0.2 Fe 2 O 4 (311) and -Fe 2 O 3 (104) were chosen for quantitative calculation where the presence of -Fe 2 O 3 impurity was calculated to be 8.2%.Figure S1in the Supporting Information illustrates the FTIR spectra of PDMS, PDMS-10, PDMS-20 and PDMS-30 Magpol samples. The peaks at 1415 and 1250 cm −1 are due to CH 3 bond deformation vibrations in PDMS chains 39. The broad peak at ∼ 1015 cm −1 corresponds to Si-O-Si multi-component stretching peaks.…”

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Remote control of biofouling by heating PDMS/MnZn ferrite nanocomposites with an alternating magnetic field

Panigrahi

Sharma

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: The accumulation of unwanted microorganisms on wetted surfaces, leading to surface damage and contamination, is a common and significant global issue. RESULTS: Herein, we report a novel technique where the growth of microorganisms can be readily controlled by coating the surfaces with a polydimethylsiloxane (PDMS)/Mn 0.8 Zn 0.2 Fe 2 O 4 (manganese-zinc ferrite) nanocomposite followed by applying alternating magnetic field (AMF). The PDMS/MnZn ferrite nanocomposite is light weight and thermally stable (up to ∼ 330 ∘ C) that can form a flexible coating. PDMS also provides hydrophobicity, which is further enhanced by the addition of Mn and Zn. The improved hydrophobicity makes the coated surface less susceptible to biofilm formation. When external AMF was applied to nanocomposites containing various MnZn ferrite nanoparticle loads of 10%, 20% and 30%, the temperature of the surface of nanocomposites reached to 80, 120 and 160 ∘ C, respectively. Successful biofilm deactivation was achieved by heating the nanocomposites via AMF application, as shown in the biofilm test where up to ∼ 70% of the Pseudomonas aeruginosa PAO1 biofilm cells were killed when the AMF was applied for 20 min to the nanocomposites containing 30% nanoparticles. CONCLUSION: Coating the surface with PDMS/MnZn ferrite nanocomposites followed by applying external AMF can be an effective way to remove biofilm remotely in a wide range of applications. Evaluation of iron-cobalt/ferrite core-shell nanoparticles for cancer thermotherapy. J Appl Phys 103:07A307 (2008). 25 McNerny KL, Kim Y, Laughlin DE and McHenry ME, Chemical synthesis of monodisperse -Fe-Ni magnetic nanoparticles with tunable J Chem Technol Biotechnol 2019; 94: 2713-2720

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“…Because of easy fabrication, non-toxicity, biocompatibility and biodurability they have found potential applications in various fields. The surface of PDMS is naturally hydrophobic, but a number of efforts have been made to modify PDMS and further enhance its hydrophobicity [1,2]. PDMS hydrophobicity plays an important role in diverse applications e.g., self-cleaning surfaces [3], microfluidics [4], microelectromechanical systems [5], and biomedical applications [6].…”

Section: Introductionmentioning

confidence: 99%

Control of Polydimethylsiloxane Surface Hydrophobicity by Plasma Polymerized Hexamethyldisilazane Deposition

2019

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The properties of a polydimethylsiloxane (PDMS) surface were modified by a one-step deposition of plasma polymerized hexamethyldisilazane (pp-HMDS) by the arc discharge method. Scanning electron microscopy, atomic force microscopy, and Fourier-transform infrared spectroscopy analytical techniques were employed for morphological, structural, and chemical characterization of the pp-HMDS modified PDMS surface. The changes in PDMS substrate wetting properties were evaluated by means of contact angle measurements. The unmodified PDMS surface is hydrophobic with a contact angle of 122°, while, after pp-HMDS film deposition, a dual-scale roughness PDMS surface with contact angle values as high as 170° was obtained. It was found that the value of the contact angle depends on the plasma processing time. Chemically, the pp-HMDS presents methyl moieties, rendering it hydrophobic and making it an attractive material for creating a superhydrophobic surface, and eliminating the need for complex chemical routes. The presented approach may open up new avenues in design and fabrication of superhydrophobic and flexible organosilicon materials with a self-cleaning function.

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A cost-effective two-step method for enhancing the hydrophilicity of PDMS surfaces

Cited by 12 publications

References 44 publications

Partitioning of Small Hydrophobic Molecules into Polydimethylsiloxane in Microfluidic Analytical Devices

Partitioning of Small Hydrophobic Molecules into Polydimethylsiloxane in Microfluidic Analytical Devices

Remote control of biofouling by heating PDMS/MnZn ferrite nanocomposites with an alternating magnetic field

Control of Polydimethylsiloxane Surface Hydrophobicity by Plasma Polymerized Hexamethyldisilazane Deposition

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