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서영수,Kyunghwan Yoon,M. Rafailovich 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
We fabricated closely packed monolayer of hydrophobically modified non-porous silica (NPS) beads at air/water interface. Hydrophilic silica beads were modified by hydrocarbon that render hydrophobic on their surface. Ultra-sound applied to the water subphase, inducing large scaled two-dimensional ordering of the beads by reducing three-dimensional irregular cluster formations while spreading solvent evaporated. Furthermore, surface pressure generated by polymeric surface micelle effectively pushes the silica beads and reduces voids between the 2D silica clusters. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Seo, Y.S.,Yoon, K.,Rafailovich, M. Korean Society of Industrial and Engineering Chemi 2010 Journal of industrial and engineering chemistry Vol.16 No.6
We fabricated closely packed monolayer of hydrophobically modified non-porous silica (NPS) beads at air/water interface. Hydrophilic silica beads were modified by hydrocarbon that render hydrophobic on their surface. Ultra-sound applied to the water subphase, inducing large scaled two-dimensional ordering of the beads by reducing three-dimensional irregular cluster formations while spreading solvent evaporated. Furthermore, surface pressure generated by polymeric surface micelle effectively pushes the silica beads and reduces voids between the 2D silica clusters.
Koo, Jaseung,Koga, Tadanori,Li, Bingquan,Satija, Sushil K.,Rafailovich, Miriam H. American Chemical Society 2016 Macromolecules Vol.49 No.9
<P>We investigated the effect of density fluctuation of supercritical carbon dioxide (scCO(2)) on anomalous swelling of multilayer polymer thin films On the ridge in the pressure temperature phase diagram of CO2. In order to measure the swelling ratio along the film depth, we alternatively deposited hydrogenated poly(methyl Methacrylate) (PMMA) and deuterated polystyrene (dPS) thin films and performed the neutron reflectivity measurements as a function of CO2 pressure at 36 degrees C. The results showed that, in contrast to previous studies, CO2 was to penetrate deeply:throughout the, multilayer thin film where the magnitude of swelling along the density fluctuation ridge of CO2 was independent of film thickness. Block copolymer thin films of dPS-b-PMMA with a parallel lamellar orientation also showed similar swelling behavior in scCO(2). However, it is well-known that single-layer polymer thin films exhibit anomalous swelling behavior only the film surface. This difference is probably due to the fact that the multilayer thin films have the CO2-philic PMMA layer sandwiched between dPS layers, which can function, as a CO2 reservoir, thereby transferring the CO2 molecules from the PMMA layers to the adjacent dPS layers. Furthermore, we found that the interaction between polymers and substrates was not significant in scCO(2) from diffusion dynamics results using neutron reflectivity, thereby facilitating anomalous dilation of polymers near the substrates without a pinning effect.</P>
Influence of NaOH concentration on the decolorization of crystal violet dyed cotton fabric
Kristen Mardenborough,Maya Florentino,Robert Haxhari,Yu-Chung Lin,Miriam Rafailovich,Gary Halada,Hye Jung Jung,Taejin Kim 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.2
Synthetic dye removal is a topic of increasing interest as textile recycling has become more popular in industries. While methods involving dye removal from wastewater effluent have been widely studied and reported on, research on decolorization of fabric itself remains quite unknown. In regard to the lack of research, this study presents cotton fabric samples dyed with crystal violet (CV) that were treated with varying concentrations of sodium hydroxide (NaOH). Fabric decolorization was studied using several characterization methods. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy data showed that the cellulose structure remained unchanged after CV and NaOH treatment. Characteristic CV peaks in the FTIR and Raman spectra were apparent only in the control sample, while the spectra of NaOH-treated samples were very similar to that of the cotton fabric. X-ray diffractometry (XRD) data also confirmed that the crystallite size of cellulose was not affected by CV and NaOH treatment. A visible violet hue remained in all NaOH-treated samples, though CV intensity was inversely proportional to NaOH concentration. The L<SUP>*</SUP>a<SUP>*</SUP>b<SUP>*</SUP> values were utilized to complement characterization results. As the concentration of NaOH was increased, the CIELAB parameters aligned more with those of the plain untreated fabric.
Control of Anti-Thrombogenic Properties: Surface-Induced Self-Assembly of Fibrinogen Fibers
Koo, Jaseung,Galanakis, Dennis,Liu, Ying,Ramek, Alexander,Fields, Adam,Ba, Xiaolan,Simon, Marcia,Rafailovich, Miriam H. American Chemical Society 2012 Biomacromolecules Vol.13 No.5
<P>Wound healing is a complex process initiated by the formation of fibrin fibers and endothelialization. Normally, this process is triggered in a wound by thrombin cleavage of fibrinopeptides on fibrinogen molecules, which allows them to self spontaneously-assemble into large fibers that provide the support structure of the clot and promote healing. We have found that the fibrous structures can also form without thrombin on most polymer or metal surfaces, including those commonly used for stents. We show that the relatively hydrophobic E and D regions of the fibrinogen molecule are adsorbed on these surfaces, exposing the αC domains, which in turn results in the formation of large fiber structures that promote endothelial cell adhesion. We show that the entire process can be suppressed when stents or other substrates are coated with polymers that are functionalized to bind the αC domains, leading to the development of potentially nonthrombogenic implant materials.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2012/bomaf6.2012.13.issue-5/bm2015976/production/images/medium/bm-2011-015976_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm2015976'>ACS Electronic Supporting Info</A></P>
Thermochemical degradation of cotton fabric under mild conditions
Michael Cuiffo,정혜정,Asta Skocir,Theanne Schiros,Emily Evans,Elizabeth Orlando,Yu-Chung Lin,Yiwei Fang,Miriam Rafailovich,Taejin Kim,Gary Halada 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
Textile waste presents a major burden on the environment, contributing to climate change and chemical pollution as toxic dyes and finishing chemicals enter the environment through landfill leachate. Moreover, the majority of textile waste reaching landfills is discarded clothing, which could be reused or recycled. Here we investigate environmentally benign morphology changing of cotton textiles as a precursor for reintegration into a circular materials economy. At 50 °C using low concentrations of acids and bases, the interfiber structures of woven cotton were successfully degraded when treated with the following sequence of chemical treatment: citric acid, urea, sodium hydroxide, ammonium hydroxide, and sodium nitrate. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) reveal separation of the constituent fibers without depolymerization of the cellulose structure, and streaming potential measurements indicate that surface charge effects play a key role in facilitating degradation. The proposed reaction procedures show feasibility of effective waste-fabric recycling processes without chemically intensive processes, in which staple fibers are recovered and can be re-spun into new textiles.
Correction: Manipulation of cell adhesion and dynamics using RGD functionalized polymers
Li, Juyi,Yu, Yingjie,Kim, Myungwoong,Li, Kao,Mikhail, John,Zhang, Linxi,Chang, Chung-Chueh,Gersappe, Dilip,Simon, Marcia,Ober, Christopher,Rafailovich, Miriam Royal Society of Chemistry 2017 Journal of Materials Chemistry B Vol. No.
<P>Correction for ‘Manipulation of cell adhesion and dynamics using RGD functionalized polymers’ by Juyi Li <I>et al.</I>, <I>J. Mater. Chem. B</I>, 2017, DOI: 10.1039/c7tb01209h.</P>