Surface characterization by FTIR-ATR spectroscopy of polyethersulfone membranes-unmodified, modified and protein fouled

Belfer, S.; Fainchtain, R; Purinson, Y.; Kedem, O.

doi:10.1016/s0376-7388(00)00316-1

Cited by 348 publications

(161 citation statements)

References 29 publications

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“…In the same way the peak at 2970 cm -1 changes when it is compared to the 2933 cm -1 band. This fact is due to the increment in the aliphatic chain as a consequence of the grafted polymer, which agrees with Belfer et al [17]. It is clear that this band (2970 cm -1 ) corresponds to the graft inasmuch as the spectrum of PMMA shows this assignment [18].…”

Section: Resultssupporting

confidence: 86%

Grafting of methyl methacrylate onto natural keratin

et al. 2003

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Keratin fibers from chicken feathers were modified through graft copolymerization with methyl methacrylate in an aqueous medium, using a KMnO 4 / malic acid redox system. Original and grafted fibers were characterized by IR and Raman spectroscopy and their thermal behavior was studied by both differential scanning calorimetry and thermogravimetric analysis. The grafted fiber surface was characterized by scanning electron microscopy. The characterization results show that grafting was effectively achieved and this was confirmed by a ninhydrin test after acidic hydrolysis of the grafted keratin.

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Section: Resultssupporting

confidence: 86%

Grafting of methyl methacrylate onto natural keratin

et al. 2003

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“…The reason for this result would be overlapping bands of the strongest bands for PEG and PEGMA with bands for PES.Indeed, a significant increase in absorbance at ∼1105cm C=O vibration in the ester molecule, which is located at 1714 cm −1 . Such overlapping band is also found in previous publications by Susanto and Ulbricht [18] and Belfer et al [20].…”

Section: Surface Chemistrysupporting

confidence: 88%

Preparation of Low fouling Polyethersulfone Membranes by Simultaneously Phase Separation and Redox Polymerization

Roihatin¹,

Susanto

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Characterization of Polydopamine-Coated Polyethersulfone (PES) membrane for water purification Syawaliah, S Mulyati, Muzaitun et al. Abstract. This paper presents preparation of low fouling PES membranes by non solvent induced phase separation (NIPS) coupled with redox polymerization.The membrane characterization included water permeability, morphology structure (by SEM) and surface chemistry (by FTIR).Water permeability measurements showed thatthe membranes have water permeability within the range 10-50 L/h.m 2 .bar. Addition of PEG dan PEGMA intopolymer solution increased water permeability, whereas blending redox initiator and crosslinker, MBAA in polymer solution decreased water permeability.Surface morfology of membranes by SEM showed that unmodified PES membrane had smaller pore size than PEG or PEGMA modified PES membranes. Furthermore, PES-PEG or PES-PEGMA membranes modified by blending with redox initiator and MBAA as crosslinker showed smaller pore size than unmodified membrane. FTIR analysis showed that all membranes have typical spectraof PES polymer;however no additional peak was observed forthe membranes prepared with addition of PEG/PEGMA, initiator redox and also crosslinker. The addition of PEG/PEGMA, redox initiator and crosslinker resulted in membranes with high rejection and an acceptable flux as well as more stable due to relatively high fouling resistance.

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“…Especially, the latter is strongly coupled with intermolecular HB dynamics (49)(50)(51)(52)(55)(56)(57)(58), and in general, the O-H stretching frequency red-shifts as the intermolecular HB becomes stronger (100)(101)(102)(103)(104). On the other hand, the complex dielectric constant of albumin crystal exhibits the several amide bands (66,105,106) between 30 and 50 THz, the C-H stretching (87 THz) (107), and N-H stretching (~100 THz) (66) in the MIR region. Hence, for the complex dielectric constant of albumin aqueous solution, the latter two stretching bands of albumin overlap with the O-H stretching of water, complicating the interpretation of the HB environment of water around protein.…”

Section: Derivation Of O-h Stretching Of Hydration Watermentioning

confidence: 99%

Hydrogen Bond Network of Water around Protein Investigated with Terahertz and Infrared Spectroscopy

Shiraga

Ogawa

Kondo

2016

Biophysical Journal

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The dynamical and structural properties of water at protein interfaces were characterized on the basis of the broadband complex dielectric constant (0.25 to 400 THz) of albumin aqueous solutions. Our analysis of the dielectric responses between 0.25 and 12 THz first revealed hydration water with retarded reorientational dynamics extending~8.5 Å (corresponding to three to four layers) out from the albumin surface. Second, the number of nonhydrogen-bonded water was decreased in the presence of the albumin solute, indicating protein inhibits the fragmentation of the water hydrogen-bond network. Finally, water molecules at the albumin interface were found to form a distorted hydrogen-bond structure due to topological and energetic disorder of the protein surface. In addition, the intramolecular O-H stretching vibration of water (~100 THz), which is sensitive to hydrogen-bond environment, pointed to a trend that hydration water has a larger population of strongly hydrogen-bonded water molecules compared with that of bulk water. From these experimental results, we concluded that the ''strengthened'' water hydrogen bonds at the protein interface dynamically slow down the reorientational motion of water and form the less-defective hydrogen-bond network by inhibiting the fragmentation of water-water hydrogen bonds. Nevertheless, such a strengthened water hydrogen-bond network is composed of heterogeneous hydrogen-bond distances and angles, and thus characterized as structurally ''distorted.''

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Surface characterization by FTIR-ATR spectroscopy of polyethersulfone membranes-unmodified, modified and protein fouled

Cited by 348 publications

References 29 publications

Grafting of methyl methacrylate onto natural keratin

Grafting of methyl methacrylate onto natural keratin

Preparation of Low fouling Polyethersulfone Membranes by Simultaneously Phase Separation and Redox Polymerization

Hydrogen Bond Network of Water around Protein Investigated with Terahertz and Infrared Spectroscopy

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