Highly Sensitive Optical Sensors Using Electrospun Polymeric Nanofibrous Membranes

Lee, Soo‐Hyoung; Drew, Christopher; Senecal, Kris; Kumar, Jayant; Samuelson, Lynne A.

doi:10.1557/proc-708-bb10.44

Cited by 13 publications

(15 citation statements)

References 2 publications

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“…[32][33][34][35]. More recently, cross-linked co-polymers composed of cinnamoiloxyethyl methacrylate and isooctyl acrylate for oil sorber applications have been reported as well [36].…”

Section: Introductionmentioning

confidence: 99%

Polycinnamates and Block Co-polymers Prepared by Atom Transfer Radical Polymerization and Microwave Irradiation

Buruiana

Jitaru

Buruiană

et al. 2010

Designed Monomers and Polymers

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Homo-polymers of 2-cinnamoyloxyethyl methacrylate (PCEMA) and block co-polymers with methylmethacrylate (MMA) synthesized via copper(I)bromide/pentamethyldiethylentriamine-mediated atom transfer polymerization (ATRP) and microwave irradiation, under homo(co)polymerization conditions, are reported. Method 1 led to homo-polymers with relatively low molecular weight (PCEMA-1: 5100; PCEMA-2: 25 000), while the second method offered polymer of 100 000 average molecular weight (PCEMA-3), the polymerization being completed within 60 min. Two di-block co-polymers, poly(2-cinnamoyloxyethyl methacrylate-block-poly(methyl methacrylate)) ((PCEMA-b-PMMA)-1, (PCEMA-b-PMMA)-2) with 0.33 and, respectively, 0.5 molar fraction of photo-cross-linkable PCEMA were also prepared and utilized for this study. Subsequent gel-permeation chromatography (GPC) measurements on block co-polymers have indicated molecular weights of 24 000 and 45 700, respectively. In addition, structural characteristics for all photo-polymers were determined by FT-IR, 1 H-NMR, UV-Vis spectroscopy, AFM and SEM/ESEM measurements. Photochemistry in thin polymeric films suggested that UV irradiation is accompanied by an insolubilization of the film caused by the transformation of cinnamate moieties and the formation of intermolecular cross-links, with important effects on the morphology. As expected, it was found that by electrospinning the above photo-polymers produced electrospun fibers of small diameter.

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“…[32][33][34][35]. More recently, cross-linked co-polymers composed of cinnamoiloxyethyl methacrylate and isooctyl acrylate for oil sorber applications have been reported as well [36].…”

Section: Introductionmentioning

confidence: 99%

Polycinnamates and Block Co-polymers Prepared by Atom Transfer Radical Polymerization and Microwave Irradiation

Buruiana

Jitaru

Buruiană

et al. 2010

Designed Monomers and Polymers

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“…These nanofibers are of considerable interest for various kinds of applications, because they have several unique properties such as high specific surface area and high porosity. Examples are fiber membranes for filter applications, 9 biomedical applications such as wound dressings and scaffolds for tissue engineering, 10, 11 sensing applications, 12,13 and fiber templates for the preparation of functional nanotubes. 14,15 The ultimate aim of this study is to develop wound dressings composed of the electrospun SF nanofibers.…”

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confidence: 99%

“…In addition, the chemical treatment to crystallize the as-spun SF nanofibers was conducted. Solid-state 13 C CP/MAS nuclear magnetic resonance (NMR), wide-angle X-Ray diffraction (WAXD), ATR-IR were used to investigate the conformational structure of as-spun and chemically treated SF nanofibers.…”

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confidence: 99%

Silk Fibroin Nanofiber. Electrospinning, Properties, and Structure

Kim

Nam

Lee

et al. 2003

Polym J

222

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ABSTRACT:An electrospinning process was used to fabricate silk fibroin (SF) nanofiber nonwovens for wound dressing applications. The electrospinning of regenerated SF was performed with formic acid as a spinning solvent. For crystallization, as-spun SF nanofiber nonwovens were chemically treated with an aqueous methanol solution of 50%. The morphology, porosity and conformational structures of as-spun and chemically treated SF nanofibers were investigated by scanning electron microscopy (SEM), mercury porosimetry, wide angle X-Ray diffraction (WAXD), attenuated total reflectance infrared spectroscopy (ATR-IR), solid state 13 C CP/MAS nuclear magnetic resonance (NMR) spectroscopy. SEM micrograph showed that the electrospun SF nanofibers had an average diameter of 80 nm and a distribution in diameter ranging from 30 to 120 nm. The porosity of as-spun SF nanofiber nonwovens was 76.1%, indicating it was highly porous. Conformational transitions of the as-spun SF nanofibers from random coil to β-sheet by aqueous methanol treatment occurred rapidly within 10 min, confirmed by solid-state 13 C NMR, ATR-IR, and X-Ray diffraction. KEY WORDS Silk Fibroin / Electrospinning / Nanofiber / Nonwovens / Conformation / Porosity / β−Sheet / Random Coil / Silk as a typical fibrous protein is produced by a variety of insects including silkworm. Among the native silk proteins, the silkworm silk, mostly that of the domesticated Bombyx mori, has been used as high-quality textile fiber and suture for a long time. B. mori silk consists of two types of proteins, fibroin and sericin. Fibroin is the protein that forms the filaments of silkworm silk and gives silk its unique physical and chemical properties. 1 Sericins are the group of gummy proteins which bind the fibroin filaments. Silk fibroin (SF) can be used in various forms, such as gels, powders, fibers, or membranes, depending on application. 2-5 Besides its utility as a textile fiber, many researchers have recently investigated SF as one of candidate materials for biomedical applications because it has several useful properties including good biocompatibility, good oxygen and water vapor permeability, biodegradability, and minimal inflammatory reaction. 6-8 Practically, SF has been used in various fields such as cosmetics, medical materials for human health, and food additives.Recently, much attention has been paid to electrospinning process as an unique technique because it can produce polymer nanofibers with diameter in the range from several micrometer down to tens of nanometers, depending on the polymer and processing conditions. In electrospinning, a high voltage is applied to create electrically charged jets of a polymer solution. These jets dry to form nanofibers, which are collected on a target as nonwovens. These nanofibers are of considerable interest for various kinds of applications, because they have several unique properties such as high specific surface area and high porosity. Examples are fiber membranes for filter applications, 9 biomedical applications such as wou...

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“…Ascribed to the high surface area, porous structure, and the ability to adopt functional molecules and nanomaterials (e.g. nanoparticles, nanotubes), nanofiber nonwoven webs have been used in areas as diverse as batteries (Norris et al, 2000), biomedical (Liang et al, 2007, Agarwal et al, 2008, Yoshimoto et al, 2003, Cao et al, 2009, Xu et al, 2004, filtrations (Gibson et al, 2001, F. DOTTI andMAZZUCHETTI*, October 2007), medical prostheses (Buchko et al, 1999, Buchko et al, 2001, sensors (Wang et al, 2002b, Wang et al, 2002a, fuel cells (Shabani et al, Li et al), nanocomposites (Huang et al, 2003, Chronakis, 2005, and protective clothing Obendorf, 2007, Ramakrishna et al, 2006). Electrospun nanofibers are generally collected as nonwoven or randomly arranged structures, due to the "whipping instability" of the electrospinning jet.…”

Section: Nanofibers and Yarnsmentioning

confidence: 99%