Surface studies on benzophenone doped PDMS microstructures fabricated using KrF excimer laser direct write lithography

Kant, Madhushree Bute; Shinde, Shashikant D.; Bodas, Dhananjay; Patil, K.R.; Sathe, Vasant; Adhi, K. P.; Gosavi, Suresh

doi:10.1016/j.apsusc.2014.06.054

Cited by 25 publications

(5 citation statements)

References 41 publications

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“…In addition, the symmetric rocking, symmetric bending, asymmetric bending, symmetric stretching, and asymmetric stretching vibration modes of CH 3 appeared at 862, 1262, 1412, 2906, and 2965 cm -1 , respectively. This Raman spectrum of the EB-crosslinked PDMS was very consistent with the spectra in literatures [20][21][22]. In cases of the EB-irradiated composite films, typical Raman bands of both MWCNT and PDMS were detected, although the band intensities of MWCNT in the composite films were much higher than the ones of the PDMS matrix, owing to the strong Raman scattering capability of MWCNT in symmetric vibrational modes.…”

Section: Structural Characterizationsupporting

confidence: 86%

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

2015

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Electron beam (EB)-crosslinked flexible polydimethylsiloxane (PDMS) composite films containing 1.0-3.0 wt% pristine MWCNT were manufactured, and their structures, thermomechanical, and electrical properties were systematically investigated for applications as electric heating materials. The crosslinking extent of PDMS/MWCNT composite films was found to increase with the EB irradiation dose of 200-600 kGy, irrespective of the MWCNT content. Raman spectra showed that I D /I G values (0.97-1.02) for the EB-crosslinked composite films were lower than those of pristine and EB-irradiated MWCNTs (1.07-1.17), demonstrating the possibility of the chemical interaction between MWCNT and PDMS in the composite films. Dynamic mechanical thermal data revealed that the EB-crosslinked composite films possessed flexible features in a wide range of temperatures, although the storage moduli increased slightly with the increment of the MWCNT content. The electrical resistivity and electric heating behavior of the composite films, which were thermally stable up to *200°C, were strongly dependent on the MWCNT content as well as applied voltage. For instance, the composite film with 2.0 wt% MWCNT achieved a steady-state maximum temperature of *150°C at a relatively low voltage of 35 V and it also maintained stable and reproducible electric heating performance under stepwise cyclic voltage changes for a long period of time.

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Section: Structural Characterizationsupporting

confidence: 86%

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

2015

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“…50 Due to a large portion of fluorine in PVDF-HFP, XPS spectra of E-PH showed a quite-strong F 1s peak and a small C 1s peak. In the cases of E-M3 and E-M5 that were coated by the mixture of PVDF and PDMS, a relatively intensive O 1s peak was evidence of the Si−O−Si bond compared with E-PH, 51 and a new Si 2p peak that could be deconvoluted into the two components of Si−C and Si−O was exhibited; 52 however, in spite of the addition of PVDF, an F 1s peak did not appear. Considering the XPS focus on the surface chemical-composition analysis, this result was in line with the depiction of the microsphere-formation mechanism that is associated with the migration of PDMS molecules.…”

Section: Methodsmentioning

confidence: 97%

Engineering the Re-Entrant Hierarchy and Surface Energy of PDMS-PVDF Membrane for Membrane Distillation Using a Facile and Benign Microsphere Coating

Lee

Deka

Guo

et al. 2017

Environ. Sci. Technol.

120

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To consolidate the position of membrane distillation (MD) as an emerging membrane technology that meets global water challenges, it is crucial to develop membranes with ideal material properties. This study reports a facile approach for a polyvinylidene fluoride (PVDF) membrane surface modification that is achieved through the coating of the surface with poly(dimethylsiloxane) (PDMS) polymeric microspheres to lower the membrane surface energy. The hierarchical surface of the microspheres was built without any assistance of a nano/microcomposite by combining the rapid evaporation of tetrahydrofuran (THF) and the phase separation from condensed water vapor. The fabricated membrane exhibited superhydrophobicity-a high contact angle of 156.9° and a low contact-angle hysteresis of 11.3°-and a high wetting resistance to seawater containing sodium dodecyl sulfate (SDS). Compared with the control PVDF-hexafluoropropylene (HFP) single-layer nanofiber membrane, the proposed fabricated membrane with the polymeric microsphere layer showed a smaller pore size and higher liquid entry pressure (LEP). When it was tested for the direct-contact MD (DCMD) in terms of the desalination of seawater (3.5% of NaCl) containing SDS of a progressively increased concentration, the fabricated membrane showed stable desalination and partial wetting for the 0.1 and 0.2 mM SDS, respectively.

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“…The Raman spectra of untreated wood, pure PDMS, and PDMS@wood samples are shown in Figure 4 . A typical Raman spectrum of the pure PDMS elastomer material showed the following peaks characterizing the various chemical bonds in the polymer; 490 cm −1 (Si-O-Si symmetric stretching), 712 cm −1 (Si-C symmetric stretching), 787 cm −1 (CH 3 asymmetric rocking and Si-C asymmetric stretching), 859 cm −1 (CH 3 symmetric rocking), 1262 cm −1 (CH 3 symmetric bending), 1411 cm −1 (CH 3 asymmetric bending), 2908 cm −1 (CH 3 symmetric stretching), and 2908 cm −1 (CH 3 asymmetric stretching) [ 30 , 31 , 32 ]. The pronounced peaks originating from Si-O-Si symmetric stretching at 490 cm −1 , Si-C symmetric stretching at 712 cm −1 , and CH 3 asymmetric stretching at 2970 cm −1 observed on the PDMS@wood surface were attributed to the successful adhesion of the PDMS to the wood surface.…”

Section: Resultsmentioning

confidence: 99%

Novel Low-Temperature Chemical Vapor Deposition of Hydrothermal Delignified Wood for Hydrophobic Property

et al. 2020

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As a hydrophilic material, wood is difficult to utilize for external applications due to the variable weather conditions. In this study, an efficient, facile, and low-cost method was developed to enhance the hydrophobicity of wood. By applying the low-temperature chemical vapor deposition (CVD) technology, the polydimethylsiloxane-coated wood (PDMS@wood) with hydrophobic surface was fabricated employing dichlorodimethylsilane as the CVD chemical resource. The result of water contact angle (i.e., 157.3°) revealed the hydrophobic behavior of the PDMS@wood. The microstructures of the wood samples were observed by scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS) analysis verified PDMS successfully coated on wood surfaces. The chemical functional groups of the PDMS@wood were investigated by Fourier transform infrared (FT-IR) and Raman spectra. The thermogravimetric results indicated the enhanced thermal stability of the wood after PDMS coating. In addition, the stability test of PDMS@wood indicated that the hydrophobicity properties of the PDMS@wood samples were preserved after long-time storage (e.g., 30 days). The scratch test was carried out to examine the abrasion resistance of the hydrophobic coatings on PDMS@wood surface. It was suggested that low-temperature CVD process could be a successful approach for fabricating hydrophobic wood.

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Surface studies on benzophenone doped PDMS microstructures fabricated using KrF excimer laser direct write lithography

Cited by 25 publications

References 41 publications

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

Engineering the Re-Entrant Hierarchy and Surface Energy of PDMS-PVDF Membrane for Membrane Distillation Using a Facile and Benign Microsphere Coating

Novel Low-Temperature Chemical Vapor Deposition of Hydrothermal Delignified Wood for Hydrophobic Property

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