Bibliographies thématiques / COATED PDMS

Littérature scientifique sur le sujet « COATED PDMS »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "COATED PDMS"

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Tang, Daibin, et Enzhou Liu. « Facile Fabrication of Robust and Fluorine-Free Superhydrophobic PDMS/STA-Coated Cotton Fabric for Highly Efficient Oil-Water Separation ». Coatings 13, no 5 (19 mai 2023) : 954. http://dx.doi.org/10.3390/coatings13050954.

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Oil–water separation using special wettability materials has received much attention due to its low energy consumption and high separation efficiency. Herein, a fluorine-free superhydrophobic cotton fabric (PDMS/STA-coated cotton fabric) was successfully prepared by a simple impregnation method using hydroxyl-capped polydimethylsiloxane (PDMS-OH), tetraethoxysilane (TEOS), and stearic acid (STA) as precursors. The investigation found that the cross-linking reactions between the hydroxyl groups of PDMS-OH and hydrolyzed TEOS enabled a strong interaction between PDMS-OH and cotton fabric. Furthermore, a suitable roughness surface of coated cotton fabric was established by introducing STA due to its long chain structure. The contact angle of this composite can reach 158.7° under optimal conditions due to its low surface energy and desired roughness. The oil/water separation efficiency of PDMS/STA-coated cotton fabric is higher than 90% even after 10 cycles of oil–water separation, and the oil flux can reach 11862.42 L m−2 h−1. In addition, PDMS/STA-coated cotton fabric exhibits excellent chemical stability and durability under extreme conditions such as strong acid (HCl, pH = 1~2) and alkali (NaOH, pH = 13~14), and the hydrophobicity of PDMS/STA-coated cotton fabric was decreased to 147° after 300 cycles of abrasion testing.
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Ding, Yin Yan, Bi Xu, Feng Yan Ge et Zai Sheng Cai. « Robust Superhydrophobic and Photocatalytic Cotton Fabrics Based on TiO2-SiO2-PDMS Composite Coating  ». Key Engineering Materials 671 (novembre 2015) : 225–30. http://dx.doi.org/10.4028/www.scientific.net/kem.671.225.

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In this work, self-cleaning cotton fabrics were prepared based on the TiO2-SiO2-Polydimethylsiloxane (PDMS) composites. TiO2-SiO2 composites were synthesized by depositing TiO2 nanocrystals onto preformed porous SiO2 and PDMS was used to enhance the linkage between TiO2-SiO2 composites and cotton fabrics. The TiO2-SiO2-PDMS composites coated cotton fabrics show superhydrophobicity with a water contact angle of 157°because of the abundant of methyl groups and hierarchical roughness features of the coated cotton fabrics. Meanwhile, the TiO2-SiO2-PDMS composites coated cotton fabrics display photocatalytic property, which were analyzed based on the removal and degradation of rhodamine B (RhB) under ultraviolet light. Abrasion resistance test indicates that the coating possesses a good mechanically durability.
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Shi, Dongyan, Dan Ma, Feiqing Dong, Chen Zong, Liyue Liu, Dan Shen, Wenji Yuan, Xiangmin Tong, Hengwu Chen et Jinfu Wang. « Proliferation and multi-differentiation potentials of human mesenchymal stem cells on thermoresponsive PDMS surfaces grafted with PNIPAAm ». Bioscience Reports 30, no 3 (15 décembre 2009) : 149–58. http://dx.doi.org/10.1042/bsr20090026.

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The thermo-responsivity of PNIPAAm [poly(N-isopropylcarylamide)]-grafted PDMS [poly(dimethylsiloxane)] surface is a property that could be feasibly used for detaching cells adhered on the surface. We used benzophenone-initiated photopolymerization to graft PNIPAAm on PDMS substrates to construct the PNIPAAm-grafted PDMS surface and this PDMS surface was highly thermo-responsive. hMSCs (human mesenchymal stem cells) were used to analyse the proliferation and multi-differentiation of stem cells on the PNIPAAm-grafted PDMS surface. The results showed that hMSCs could adhere on the PNIPAAm-grafted PDMS surface at 37°C and form cell colonies, and then become fibroblastic. The proliferation potential of hMSCs on the PNIPAAm-grafted PDMS surface was not significantly different from that on a plate surface coated with gelatin. However, as it proved easier to detach cells from the surface, by changing temperature, a higher viability of detached cells could be obtained with the PNIPAAm-grafted PDMS surface, using a temperature shift, compared with a gelatin-coated surface, where cells are detached by treatment with trypsin. hMSCs on the PNIPAAm-grafted PDMS surface were induced into osteoblasts, adipocytes and neurocytes under osteogenic medium, adipogenic medium and neurogenic medium respectively. The PNIPAAm-grafted PDMS surface was favourable for osteogenesis of hMSCs, although the potentials of adipogenesis and neurogenesis of hMSCs on the PNIPAAm-grafted PDMS surface were similar to those on the plate surface coated with gelatin. The above results demonstrate that the PNIPAAm-grafted PDMS surface not only kept the potentials of proliferation and multi-differentiation of hMSCs, but also increased the viability of hMSCs.
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Abdul Samad, Yarjan, Yuanqing Li et Kin liao. « A Novel Graphene Foam for Low and High Strains and Pressure Sensing Applications ». MRS Advances 1, no 1 (2016) : 27–32. http://dx.doi.org/10.1557/adv.2016.20.

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ABSTRACTWe are reporting the formation of free-standing graphene foam (GF) via a novel two-step process, in which a polyurethane (PU) foam is first dip-coated with graphene oxide (GO) and subsequently the dried GO-coated-PU is heated in nitrogen atmosphere at 1000°C. During the pyrolysis of the GO-coated-PU, GO is reduced to GF whereas PU is simultaneously decomposed and released completely as volatiles in a step wise mass-loss mechanism. Morphology of the formed GF conforms to that of the pure PU foam as indicated by the scanning electronic micrographs. Polydimethylsiloxane (PDMS) was successfully infiltrated inside the GF to form flexible and stretch-able conductors. The GF-PDMS composite was tested for it’s pressure and strain sensing capabilities. It is shown that a 30% compressive strain changes resistance of the GF-PDMS composite to about 800% of it’s original value. Since density of the formed GF is tunable, therefore, the pressure/strain sensivity of the GF-PDMS composite is also tunable.
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Wahyuningsih, Sayekti, Rochmad E. Cahyono et Fitri N. Aini. « Preparation Titanium Dioxide Combined Hydrophobic Polymer with Photocatalytic Self-Cleaning Properties ». Bulletin of Chemical Reaction Engineering & ; Catalysis 15, no 3 (10 décembre 2020) : 874–84. http://dx.doi.org/10.9767/bcrec.15.3.9225.874-884.

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Titanium dioxide (TiO2) and hydrophobic of TiO2/PDMS (PDMS = polydimethylsiloxane) have been prepared as photocatalytic self-cleaning materials. Synthesis of TiO2 was carried out using the sol-gel method with titanium(IV) isopropoxide (TTIP) as a precursor and acetic acid as a solvent at a temperature of about 10–15 °C, while the synthesis of hydrophobic of TiO2/PDMS composites was carried out by a sonication method under ethanol solution. The results of XRD analysis of synthesized TiO2 showed that TiO2 was anatase phase. The glass-coated TiO2/PDMS were prepared by dip-coating under an ultrasonication bath. TiO2/PDMS composites at a ratio of TiO2/PDMS (1) on the glass plate showed hydrophobic properties, as evidenced by the contact angle of 104° before irradiation and the contact angle of 99.7° after irradiation. The synthesized titanium dioxide has irregular spherical morphology. The increase in PDMS content was correlated with an increase in the roughness of TiO2. PDMS not only acts as low surface energy but also binds TiO2. The hydrophobic behavior of PDMS creates TiO2/PDMS repel each other, gain irregular agglomeration structures. Beside having optimum contact angle, glass-coated TiO2/PDMS (1) is the best composition for degradation of methylene blue in 69.68% for 20 minutes irradiation. Copyright © 2020 BCREC Group. All rights reserved
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Zhang, Chunmei, Tianliang Zhai, Chao Zhan, Qiuping Fu et Chao Ma. « Actuation Behavior of Multilayer Graphene Nanosheets/Polydimethylsiloxane Composite Films ». Polymers 10, no 11 (9 novembre 2018) : 1243. http://dx.doi.org/10.3390/polym10111243.

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The graphene nanosheets (GNS)/polydimethylsiloxane (PDMS) composite films with out-of-plane dielectric actuation behavior were prepared through a layer-by-layer spin coating process. The GNS-PDMS/PDMS composite films with 1~3 layers of GNS-PDMS films were spin coated on top of the PDMS film. The dielectric, mechanical, and electromechanical actuation properties of the composite films were investigated. The dielectric constant of the GNS-PDMS3/PDMS composite film at 1 kHz is 5.52, which is 1.7 times that of the GNS-PDMS1/PDMS composite film. The actuated displacement of the GNS-PDMS/PDMS composite films is greatly enhanced by increasing the number of GNS-PDMS layers. This study provides a novel alternative approach for fabricating high-performance actuators with out-of-plane actuation behavior.
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Zhang, Jingran, Yongda Yan, Peng Miao et Jianxiong Cai. « Fabrication of gold-coated PDMS surfaces with arrayed triangular micro/nanopyramids for use as SERS substrates ». Beilstein Journal of Nanotechnology 8 (1 novembre 2017) : 2271–82. http://dx.doi.org/10.3762/bjnano.8.227.

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Using the tip-based continuous indentation process, arrays of three-dimensional pyramidal cavities have been successfully machined on a copper template and the structures were successfully transferred to a polydimethylsiloxane (PDMS) surface using a reverse nanoimprinting approach. The structured PDMS surface is coated with a thin Au film, and the final substrate is demonstrated as a surface-enhanced Raman spectroscopy (SERS) substrate. Rhodamine 6G (R6G) was used as a probe molecule in the present study to confirm the SERS measurements. Arrays of micro/nanostructures of different dimensions were formed by the overlap of pyramidal cavities with different adjacent distances using the tip-based continuous indentation process. The effects of the reverse nanoimprinting process and coating process on the final topography of the structures are studied. The experimental results show that the Raman intensity of the Au-film-coated PDMS substrate is influenced by the topography of the micro/nanostructures and by the thickness of the Au film. The Raman intensity of 1362 cm−1 R6G peak on the structured Au-film-coated PDMS substrate is about 8 times higher than the SERS tests on a commercial substrate (Q-SERS). A SERS enhancement factor ranging from 7.5 × 105 to 6 × 106 was achieved using the structured Au-film-coated PDMS surface, and it was demonstrated that the method proposed in this paper is reliable, replicable, homogeneous and low-cost for the fabrication of SERS substrates.
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Yang, Rui, Yunyi Liang, Shu Hong, Shida Zuo, Yingji Wu, Jiangtao Shi, Liping Cai et al. « Novel Low-Temperature Chemical Vapor Deposition of Hydrothermal Delignified Wood for Hydrophobic Property ». Polymers 12, no 8 (6 août 2020) : 1757. http://dx.doi.org/10.3390/polym12081757.

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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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Taşdemir, Muharrem, Fatih Şenaslan et Ayhan Çelik. « Investigation of corrosion and thermal behavior of PU–PDMS-coated AISI 316L ». e-Polymers 21, no 1 (1 janvier 2021) : 355–65. http://dx.doi.org/10.1515/epoly-2021-0035.

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Abstract Polydimethylsiloxane (PDMS) is widely used from biomedical to industrial applications due to its nontoxic, hydrophobic, and transparent characteristics. PDMS has good thermal and adhesion properties; however, its mechanical properties are comparatively weak. Therefore, PDMS is blended with various polymers to effectively improve its mechanical properties. In this study, polyurethane (PU)–polydimethylsiloxane (PDMS) blended coatings of different concentrations were applied on the AISI 316L stainless steel surface. Their effects on corrosion and tribocorrosion properties were investigated in Ringer’s solutions. The blended polymer coatings were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The thermal properties of samples were examined by TGA and DSC. The surface images and cross-sectional were investigated using scanning electron microscopy (SEM). Tribocorrosion tests were carried out at open circuit potential (OCP). It was determined that hydrophobicity and thermal stability of polymer coating increased, while corrosion resistance slightly decreased with the increasing PDMS concentration in the polymer blended. The friction coefficient of blends decreased as the PU concentration increased. As a result, it was determined that the polymer-coated samples containing up to 50% PDMS prevented corrosive wear under the OCP wear test in Ringer’s solutions.
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Aulia, Rahmi Khairani, Mark W. Beatty et Bobby Simetich. « Effect of Superhydrophobic Coating and Nanofiller Loading on Facial Elastomer Physical Properties ». Materials 15, no 20 (20 octobre 2022) : 7343. http://dx.doi.org/10.3390/ma15207343.

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Facial prosthetics are currently constructed of materials that are far from optimal; superior materials with a “skin-like” feel are required. In this study, the property changes brought about by the consecutive additions of hydrophobic- and uncoated nano-SiO2 to polydimethylsiloxane (PDMS) are assessed, and the alterations are compared with those observed for conventional submicron SiO2-filled materials. In sequence, 0%, 0.5%, 5%, 10%, and 15% by weight of each filler type were successively added to vinyl-terminated PDMS. Tensile, tear, Durometer hardness, translucency, and viscoelastic properties were assessed, and hardness and translucency were further measured after 3000 h of outdoor weathering. The results showed that 15% coated nano- SiO2-filled PDMS materials given the highest tensile strength, elastic modulus, storage modulus, loss modulus, tear strength, and durometer hardness (p < 0.05), whereas 15% submicron coated SiO2-filled materials displayed the highest failure strain and translucency parameter (p < 0.05). Only 10%- and 15%-filled submicron SiO2 PDMS materials were altered by outdoor weathering; nevertheless, the increases were assessed to be too small to be clinically perceptible. As increased filler levels provided protection against solar radiation, heat, and moisture, only unfilled and 0.5%-filled PDMS formulations discolored from weathering. 15%-filled superhydrophobic-coated nano- SiO2-filled PDMS was found to produce the strongest, most tear-resistant, and least translucent materials, but it also produced materials with limited stretchability and high hardness, which were regarded to be downsides for creating a “skin-like” feel.
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Thèses sur le sujet "COATED PDMS"

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Edberg, Jennie. « Kappor inom damkonfektion : från grund till modell ». Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-16837.

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Bakgrunden till rapporten var att det företag som medverkat i studien ville utveckla ett grundmönster för damkappor. Syftet med arbetet blev därför att utarbeta ett grundmönster med två ärmtyper som graderas mellan storlek 32-50, samt konstruera en kappmodell från samma grund. Utöver detta skulle även detaljkonstruktioner och specifikationer utformas. Frågeställningarna som styrde arbetet kretsade därför kring hur man på bästa sätt tar fram detta.All konstruktion utfördes i Lectra´s Modaris. För att ta fram grundmönstret jämfördes två arbetssätt för att sedan välja en av de grunder som konstruerats. Efter detta gjordes nödvändiga ändringar utifrån avprovningar. Kappmodellen utarbetades genom kompletterande detaljkonstruktioner utifrån grundmönstret. Även de fristående detaljkonstruktionerna utformades på samma sätt. Specifikationerna togs fram i företagets PDM-system Quest PDM.Passformen hos grundmönstret blev god, ett mindre balansfel kan dock finnas kvar. Kappmodellen som syddes upp av produktionskontoret i Litauen motsvarade kraven. Ståkragen bland detaljkonstruktionerna kunde förbättrats, annars uppfyller även dessa konstruktioner kraven.Specifikationerna från Quest PDM visade krav och instruktioner tydligt. Dock var det problematiskt att använda flera olika ritprogram inom systemet.The background for this report was that the company cooperating with me wanted to develop a basic pattern for women´s coats. The purpose of this study was to construct a basic pattern with two types of sleeves to be graded in the sizes 32-50 and use the basic pattern to create a women´s coat. Beside this, coat details and product specifications should be produced.Lectra´s CAD-program Modaris is used for pattern construction. To create the basic pattern two different construction methods was used, and one of them chosen for further developing. The coat was developed from the basic pattern through additional constructions. The separate detail construktions was created be the same method. The companys PDM system Quest PDM was used to form the product specifications.The fit of the basic pattern was good, a minor balance fault might still remain. The coat sewn by the companys production office in Lithuenia met the requirements. The standing straight collar could be further improved, the other detail constructions lived up to the standars.The product specifications from Quest PDM showed the instructions and demands clearly. Unfortunately there was a problem using different illustration software within the system.
Program: Designteknikerutbildningen
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Chen, Yi-chieh, et 陳逸杰. « Fabrication of PDMS Waveguide Coated with Gold Nano-particles and Its Localized SPR Applications ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/d64d3w.

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碩士
國立中山大學
機械與機電工程學系研究所
96
This research proposes a novel polymer-based optical waveguide made with Polydimethylsiloxane (PDMS) for optical detection applications. Alternative to other fiber-based sensor, the proposed optical sensor uses PDMS waveguide as the main sensing component. PDMS has excellent optical properties which is essential for bio-photonic detection, including highly optical transparency, good flexibility and high bio-compatibility. Uncured PDMS polymer is cast in a Teflon tubing to form the PDMS rod. Since the reflective index of PDMS is as high as 1.43, that the bare PDMS can be an optical waveguide while the reflective index of the surrounding media is smaller than 1.43. The cast PDMS waveguide is then connect with plastic optical fibers to form the proposed optical waveguide system. In order to improve the optical performance of the PDMS waveguide, a surface coating process is used to reduce the surface roughness of the PDMS waveguide. The measured insertion loss with and without performing the surface coating procedure is 1.14 and 1.71dB/cm, respectively. Once the PDMS waveguide is formed, Au nanoparticles (Au-Nps) were coated on the PDMS surface with the assistance of a positive charge polymer of PDDA to form an optical waveguide capable of localized SPR detection. In addition, an atmospheric plasma treating process is used to enhance the coating ratio and speed of Au-Nps. UV-VIS spectrum and the SEM observation of the Au-particle coated PDMS waveguide confirm that the plasma treatment process significantly improves the coating results of Au-Nps. Liquid samples with different refractive index were used to demonstrate the LSPR sensing ability of the fabricated optical waveguide. The label free DNA detection was demonstrated by the system. The thiolated single strand DNA was modify on the PDMS optical waveguide as a DNA probe and bound with target DNA by DNA hybridization. The detection limit is as low as 10 pM. This research provides a simple and fast fabrication method to fabricate waveguide-based LSPR sensors.
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PRASAD, SHRITI. « CORE SHELL POLY (DIMETHYLSILOXANA)--VINYL ESTER MICROSPHERE AS IMPACT MODIFIER FOR VINYL ESTER THERMOSETS ». Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15581.

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We report a two-step method for preparation of core shell elastomeric microspheres (CSR) using suspension polymerisation process and demonstrate its potential which proves it as an effective impact modifier for thermosetting vinyl ester resin. The first step involves suspension addition curing of siloxane macromonomer with platinum based hydrosilylation catalyst. The result of reaction parameters on the particle size distribution was decided and the elastomeric microspheres were eventually coated to prepare core-shell (PDMS-vinyl ester) microspheres. Vinyl ester composites were prepared by varying the amounts of microspheres (1-7 % w/w) and consequences of coating on the mechanical properties, that is quasi-static as well as dynamic properties were evaluated. The mechanical properties were found to improve at low loadings (≤ 3 % w/w), and the presence of an vinyl ester coating on the PDMS in the CSR led to improved dispersion, which was evident from its improved mechanical properties. The izod impact strength increased by 132 % on introduction of core shell PDMS – vinyl ester (3% w/w). Morphological studies revealed that the roughness of the fractured surface increased due to introduction of microspheres. In contrast to the PDMS containing composites, where the microspheres were removed entirely due to impact loading, the fractured surface of CSR containing composites revealed the presence of broken microspheres, which is a direct evidence of improved adhesion between elastomeric phase and the vinyl ester matrix.
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Chapitres de livres sur le sujet "COATED PDMS"

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Huikko, K., P. Östman, K. Grigoras, S. Tuomikoski, V. M. Tiainen, A. Soininen, A. Manz, S. Franssila, R. Kostiainen et T. Kotiaho. « PDMS Electrospray Devices Fabricated by PDMS-Diamond-Coated SU-8 Masters ». Dans Micro Total Analysis Systems 2002, 506–8. Dordrecht : Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0295-0_169.

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Febriani, Dina, Indah K. Sulistiyorini, Yoki Yulizar, Dewangga Oky Bagus Apriandanu, Rizki M. Surya, Andhina R. Satriani, Ariffinisa L. Widyaningtyas et Cheryl Ariela. « PDMS-Coated Rosa Centifolia Flower : Characterization and Their Stability in Toner Solutions ». Dans Lecture Notes in Mechanical Engineering, 171–77. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3934-0_20.

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Lakshmanan, Dinesh, et Srijith Kanakambaran. « Simulation Studies on Force Sensor Using PDMS Coated Fiber Bragg Grating for Robot-Assisted Surgery ». Dans Lecture Notes in Electrical Engineering, 189–94. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2818-4_20.

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David, F., N. Ochiai et P. Sandra. « Stir Bar Sorptive Extraction : A Versatile, Sensitive and Robust Technique for Targeted and Untargeted Analyses ». Dans Evolution of Solid Phase Microextraction Technology, 175–213. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839167300-00175.

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Developed in the late 1990s, stir bar sorptive extraction (SBSE) has become a very powerful extraction and enrichment technique for the determination of organic compounds in a large variety of liquid, semi-liquid and solid matrices. Based on the same sorptive extraction fundamentals as solid phase micro-extraction (SPME), SBSE had found its way to research and routine laboratories since coated stir bars and dedicated desorption equipment have become commercially available. In this chapter, the development, fundamentals, workflows and new modes of SBSE are discussed. Most attention is paid to the use of stir bars coated with polydimethylsiloxane (PDMS), since these sorptive extraction devices have proven robustness and can be considered a valuable tool in an analytical toolbox.
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« Magnetic response of aligned nickel coated carbon fibres in a PDMS matrix ». Dans Constitutive Models for Rubber IX, 197–204. CRC Press, 2015. http://dx.doi.org/10.1201/b18701-36.

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Mark, James E., Dale W. Schaefer et Gui Lin. « Surfaces ». Dans The Polysiloxanes. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780195181739.003.0008.

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Because of the great importance of the surface properties of the polysiloxanes, this topic is treated separately in this chapter. Hydrophobic polysiloxanes having simple aliphatic or aromatic side groups have surfaces that show essentially no attraction to water. In fact, polysiloxanes can serve as water repellants. This property is very useful for applications such as protective coatings on historical monuments and for controlling the surfaces of other polymers, sensors, and quantum dots. Hydrophobic surfaces can be readily regenerated if the surface becomes damaged. Regeneration occurs by rearrangements of the polysiloxane chains so that the hydrophobic methyl groups are once again covering the surface. The flexibility of the siloxane chain backbone facilitates this process. It is also possible to prepare hydrophobic films using methyl-modified siloxane melting gels. Glass surfaces or wool fibers can be coated with polydimethylsiloxane (PDMS) to make them more hydrophobic. In some cases, it is necessary to modify a polysiloxane surface to make it hydrophilic or hydrophobic. Hydrophobization is one aspect of the general topic of modifying and managing the properties of polymer surfaces. An important example involves soft contact lenses that contain PDMS, which is often used because of its very high permeability to oxygen, which is required for metabolic processes within the eye. Such lenses do not feel comfortable however because they do not float properly on the aqueous tears that coat the eye. There are a number of ways to modify the surfaces. There is even a way to make “unreactive” silicones react with inorganic surfaces. In some applications it is useful to have hydrophilicity in the bulk of the polymer instead of just at the surface. One way of doing this is by simultaneously end linking hydrophilic poly(ethylene glycol) (PEG) chains and hydrophobic PDMS chains. Another way is to make a PDMS network with a trifunctional organosilane R’Si(OR) end linker that contains a hydrophilic R’ side chain, such as a polyoxide. Treating only the surfaces is another possibility, for example, by adding hydrophilic brushes by vapor deposition/hydrolysis cycles. Such hydrophilic polysiloxanes can also serve as surfactants.
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Actes de conférences sur le sujet "COATED PDMS"

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Tseghai, Granch Berhe, Benny Malengier, Kinde Anlay Fante, Abreha Bayrau Nigusse, Bulcha Belay Etana et Lieva Van Langenhove. « PEDOT:PSS/PDMS-coated cotton fabric for ECG electrode ». Dans 2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS). IEEE, 2020. http://dx.doi.org/10.1109/fleps49123.2020.9239526.

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Ning, Xiangping, Li Han Chen, Chun Liu Zhao et Chi Chiu Chan. « PDMS Film Coated Fiber Volatile Organic Compounds Sensor ». Dans Workshop on Specialty Optical Fibers and their Applications. Washington, D.C. : OSA, 2015. http://dx.doi.org/10.1364/wsof.2015.wt4a.40.

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Park, Dong-su, Jiajun Xu et Kyoung-Su Park. « Wettability Control of PDMS Surface Coated on the Glass Using Ultrasonic Vibration Treatment ». Dans ASME 2020 29th Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/isps2020-1954.

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Abstract In this study, a method was proposed to change the surface roughness of Polydimethylsiloxane (PDMS) membrane, a hydrophobic material coated on circular steel substrates, using ultrasonic vibration with frequency above 20 kHz to control the surface tension of water droplet on the PDMS membrane. Ultrasonic vibration applied from piezo actuator was transmitted through circular steel substrate to PDMS membrane and it made the PDMS (liquid) vibrated. It made surface roughness of PDMS membrane changed. The results of coating the PDMS membrane on the circular steel substrate and measuring the contact angle of the water droplet after applying ultrasonic frequency vibration showed that ultrasonic frequency vibration could affect the surface roughness of the PDMS membrane. In this paper, we compared and discussed the surface roughness effects on various vibration frequencies and amplitudes.
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Angappan, M., Pritom J. Bora, Meghana Jois HS, Vinoy KJ, Kishore, Praveen C. Ramamurthy et K. Vijayaraju. « PDMS-Ni coated flyash cenosphere composite for broadband microwave absorption ». Dans 2018 4th IEEE International Conference on Emerging Electronics (ICEE). IEEE, 2018. http://dx.doi.org/10.1109/icee44586.2018.8937977.

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Jiang, Shaocui, Mengjiao Wang, Peng Yang, Zenghui Wang et Baojin Peng. « Temperature sensor based on tapered no-core fiber coated with PDMS ». Dans 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA2022), sous la direction de Wenqing Liu, Hongxing Xu et Junhao Chu. SPIE, 2023. http://dx.doi.org/10.1117/12.2664092.

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Frenkel, Matthew, et Zhixiong Guo. « Cryogenic Temperature Monitoring via Optical PDMS Sensors ». Dans ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7188.

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PDMS micro-sensors coated onto an electrical wire are used to measure dynamic temperature variation at cryogenic range based on optical whispering-gallery mode (WGM) frequency shift principle. We designed a lab cryogenic cell via filling liquid nitrogen to create a stable low temperature down to 95K. The electrical wire is current carrying to simulate a working electrical/electronic component/device. The temperature variation due to Joule heating is monitored. The sensors are tested for their real time temperature monitoring capabilities and accuracy in the cryogenic temperature regime of 95–140K.
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Liu, Shuyi, Changyu Shen, Chong Zhang, Chunliu Zhao, Tingting Lang, Jing Yu et Jiahao Fang. « Peanut-type fiber based hydrogen sensor coated by PDMS covered with WO3/SiO2 ». Dans 2019 18th International Conference on Optical Communications and Networks (ICOCN). IEEE, 2019. http://dx.doi.org/10.1109/icocn.2019.8933957.

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Banait, Arya, Vivek Vishwakarma, Leila Choobineh et Ankur Jain. « Growth of Patterned Micropores in Poly-Dimethylsiloxane (PDMS) Using the Thermocapillary Effect ». Dans ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65865.

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Poly-dimethylsiloxane (PDMS) is a well-known soft polymer with applications in a wide variety of research fields. PDMS is a particularly attractive material for miniaturized bioanalytical systems because of its biocompatibility, gas permeability, chemical inertness and the ability to reproduce miniature features such as microchannels in PDMS. This paper describes a technique to obtain through-membrane pores in thin PDMS membranes. This is based on thermocapillary effect in a MEMS-based microheater device made on a glass substrate. Uncured PDMS is poured on a microheater device that has been coated with a hydrophilic substrate such as poly-ethylene oxide (PEO). Upon heating, PEO evaporates and form gas bubbles in PDMS. The gas bubbles are attracted towards the hot region of the microheater device. The bubbles eventually self-assemble along the hottest isotherm, which in this case is the microheater line. In this manner, self-assembled pores in the desired pattern are obtained. Experiments conducted at different temperatures and PDMS thicknesses throw light on the physical phenomena behind this process and demonstrate the trade-off between PDMS curing rate and bubble escape rate. Results presented in this work are expected to aid in the design of novel PDMS-based membranes for filtration, separation and concentration.
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Duo, Yi, Zheng Zenan, Geng Youfu, Li Xuejin et Hong Xueming. « PDMS-coated fiber optic interferometer based on no-core fiber for multi-parameter measurements ». Dans International Conference on Optical Instruments and Technology 2019 : Optical Sensor and Applications, sous la direction de Xuping Zhang et Hai Xiao. SPIE, 2020. http://dx.doi.org/10.1117/12.2548405.

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Kyung-Il Joo, Yeonjeong Han, Chang-sub Park, Yong Wook Lee, Seong Ho Kong, Shin-Won Kang et Hak-Rin Kim. « Optical sensing of solvents using selective tensile effects of a PDMS-coated Fiber Bragg Grating ». Dans 2010 Ninth IEEE Sensors Conference (SENSORS 2010). IEEE, 2010. http://dx.doi.org/10.1109/icsens.2010.5689950.

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