51
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Liu Z, Choi H, Gatenholm P, Esker AR. Quartz crystal microbalance with dissipation monitoring and surface plasmon resonance studies of carboxymethyl cellulose adsorption onto regenerated cellulose surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8718-8728. [PMID: 21699205 DOI: 10.1021/la200628a] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Adsorption of anionic polyelectrolytes, sodium salts of carboxymethyl celluloses (CMCs) with different degrees of substitution (DS = 0.9 and 1.2), from aqueous electrolyte solutions onto regenerated cellulose surfaces was studied using quartz crystal microbalance with dissipation monitoring (QCM-D) and surface plasmon resonance (SPR) experiments. The influence of both calcium chloride (CaCl(2)) and sodium chloride (NaCl) on CMC adsorption was examined. The QCM-D results demonstrated that CaCl(2) (divalent cation) caused significantly greater CMC adsorption onto regenerated cellulose surfaces than NaCl (monovalent cation) at the same ionic strength. The CMC layers adsorbed onto regenerated cellulose surfaces from CaCl(2) solutions exhibited greater stability upon exposure to flowing water than layers adsorbed from NaCl solutions. Both QCM-D and SPR results showed that CMC adsorption onto regenerated cellulose surfaces from CaCl(2) solutions increased with increasing CaCl(2) concentration up to the solubility limit (10 mM). Voigt-based viscoelastic modeling of the QCM-D data indicated that the CMC layers adsorbed onto regenerated cellulose surfaces had shear viscosities of η(f) ≈ 10(-3) N·s·m(-2) and elastic shear moduli of μ(f) ≈ 10(5) N·m(-2). Furthermore, the combination of SPR spectroscopy and QCM-D showed that the CMC layers contained 90-95% water. Adsorption isotherms for CMCs in CaCl(2) solutions were also obtained from QCM-D and were fit by Freundlich isotherms. This study demonstrated that CMC adsorption from CaCl(2) solutions is useful for the modification of cellulose surfaces.
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Affiliation(s)
- Zelin Liu
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
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52
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Wu S, Shi L, Garfield LB, Tabor RF, Striolo A, Grady BP. Influence of surface roughness on cetyltrimethylammonium bromide adsorption from aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6091-6098. [PMID: 21488630 DOI: 10.1021/la200751m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The influence of surface roughness on surfactant adsorption was studied using a quartz crystal microbalance with dissipation (QCM-D). The sensors employed had root-mean-square (R) roughness values of 2.3, 3.1, and 5.8 nm, corresponding to fractal-calculated surface area ratios (actual/nominal) of 1.13, 1.73, and 2.53, respectively. Adsorption isotherms measured at 25 °C showed that adsorbed mass of cetyltrimethylammonium bromide per unit of actual surface area below 0.8 cmc, or above 1.2 cmc, decreases as the surface roughness increases. At the cmc, both the measured adsorbed amount and the measured dissipation increased dramatically on the rougher surfaces. These results are consistent with the presence of impurities, suggesting that roughness exacerbates well-known phenomena reported in the literature of peak impurity-related adsorption at the cmc. The magnitude of the increase, especially in dissipation, suggests that changes in adsorbed amount may not be the only reason for the observed results, as aggregates at the cmc on rougher surfaces are more flexible and likely contain larger amounts of solvent. Differences in adsorption kinetics were also found as a function of surface roughness, with data showing a second, slower adsorption rate after rapid initial adsorption. A two-rate Langmuir model was used to further examine this effect. Although adsorption completes faster on the smoother surfaces, initial adsorption at zero surface coverage is faster on the rougher surfaces, suggesting the presence of more high-energy sites on the rougher surfaces.
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Affiliation(s)
- Shuqing Wu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
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53
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Samanta T, Mukherjee M. Swelling Dynamics of Ultrathin Films of Strong Polyelectrolytes. Macromolecules 2011. [DOI: 10.1021/ma200240t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tanusree Samanta
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - M. Mukherjee
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
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54
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Lin NH, Shih WY, Lyster E, Cohen Y. Crystallization of calcium sulfate on polymeric surfaces. J Colloid Interface Sci 2011; 356:790-7. [DOI: 10.1016/j.jcis.2011.01.042] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 01/10/2011] [Accepted: 01/11/2011] [Indexed: 11/16/2022]
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55
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Huang C, Soenen SJ, Rejman J, Lucas B, Braeckmans K, Demeester J, De Smedt SC. Stimuli-responsive electrospun fibers and their applications. Chem Soc Rev 2011; 40:2417-34. [PMID: 21390366 DOI: 10.1039/c0cs00181c] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Stimuli-responsive electrospun nanofibers are gaining considerable attention as highly versatile tools which offer great potential in the biomedical field. In this critical review, an overview is given on recent advances made in the development and application of stimuli-responsive fibers. The specific features of these electrospun fibers are highlighted and discussed in view of the properties required for the diverse applications. Furthermore, several novel biomedical applications are discussed and the respective advantages and shortcomings inherent to stimuli-responsive electrospun fibers are addressed (136 references).
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Affiliation(s)
- Chaobo Huang
- Ghent Research Group on Nanomedicines, Lab General Biochemistry & Physical Pharmacy, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B9000 Ghent, Belgium
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56
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Wang X, Ding B, Yu J, Si Y, Yang S, Sun G. Electro-netting: fabrication of two-dimensional nano-nets for highly sensitive trimethylamine sensing. NANOSCALE 2011; 3:911-915. [PMID: 21152536 DOI: 10.1039/c0nr00783h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Two-dimensional (2D) polyacrylic acid (PAA) nano-nets that comprise interlinked ultrathin nanowires with diameters of 10-30 nm are successfully prepared by a facile electro-netting process. Nano-nets feature a clear geometric characteristic with ideal and weighted Steiner networks due to the rapid phase separation process and its obeyed minimal energy principle. The versatile nano-nets create enhanced interconnectivity and additional surface area and facilitate the diffusion of analytes into the membranes, which significantly boost the gas diffusion coefficient and sensing properties. As one example, PAA membranes containing fibers and nano-nets used as sensing materials are deposited by electrospinning/electro-netting on an electrode of a quartz crystal microbalance (QCM) for trimethylamine (TMA) detection, which exhibits a quick response (∼180 s), low detection limit (1 ppm) and ideal selectivity at room temperature.
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Affiliation(s)
- Xianfeng Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, China
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57
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Ahn SI, Yoon JG, Kim JH, Zin WC. Effect of water contact on the density distributions of thin supported polymer films investigated by an X-ray reflectivity method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:18483-18490. [PMID: 21067225 DOI: 10.1021/la1035085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The diffusion processes of water molecules into polymer films (PMMA/PS homopolymers and random copolymers) in contact with liquid water were investigated using gravimetric methods and X-ray reflectivity (XRR) analysis. Methods of water contact and XRR measurement were designed for studying the systems in the nonequilibrium state of diffusion. Gravimetric measurements confirmed the Fickian diffusion behavior of films in contact with water. Vertical density distributions in PMMA and methylmethacrylate-rich copolymer films demonstrate the existence of a water-rich layer at the interface. However, with further absorption of water into the film, the overall density increased throughout the film. The results suggest that the diffusion of water into the polymer film occurs to recover density uniformity with a high concentration of water molecules at the surface. Some XRR data for the PS- and styrene-rich copolymer films could not be fit and converted to a vertical density distribution because of their huge diffusion coefficients. However, the reflectivity curves for these films and the vertical density distribution after sufficient water contact suggested that the surfaces of these films were commonly diffused after water contact. Atomic force microscopy (AFM) analysis demonstrated that the surface roughness of these films actually increased with water content.
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Affiliation(s)
- Sung Il Ahn
- Department of Materials Science and Engineering, POSTECH, Pohang-city, Gyeongbuk, South Korea
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58
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Frau AF, Estillore NC, Fulghum TM, Advincula RC. Intercalative poly(carbazole) precursor electropolymerization within hybrid nanostructured titanium oxide ultrathin films. ACS APPLIED MATERIALS & INTERFACES 2010; 2:3726-3737. [PMID: 21080659 DOI: 10.1021/am100867q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A protocol for nanostructuring and electropolymerization of a hybrid semiconductor polycarbazole-titanium oxide ultrathin film is described. Ultrathin (<100 nm) films based on polycarbazole precursor polyelectrolytes and titanium oxide (TiOx) have been fabricated by combining the layer-by-layer (LbL) and surface sol-gel layering techniques. Film growth was followed and confirmed through UV-vis spectroscopy, ellipsometry and quartz crystal microbalance with dissipation (QCM-D). Subsequent anodic electrochemical oxidation of the carbazole pendant units afforded a conjugated polymer network (CPN) film within intercalating TiOx layers of cross-linked and π-conjugated carbazole units. Cyclic voltammetry (CV), UV-vis, and fluorescence spectroscopy measurements confirmed this process. The LbL-driven polyelectrolyte deposition process resulted in a quantified electrochemical response, proportional to the number of layers, while the TiOx acted as a dielectric spacer limiting electron transfer kinetics and attenuating energy transfer in fluorescence. Electro-optical properties were compared with other polycarbazole thin film materials with respect to bandgap energy (Eg). The straightforward protocol in film nanostructuring and barrier/dielectric properties of the inorganic oxide slab (denoted here as, TiOx) should enable applications in organic light-emitting diodes (OLEDs), dielectric mirrors, planar waveguides, and photovoltaic devices for these hybrid ultrathin films.
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Affiliation(s)
- Antonio F Frau
- Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-5003, United States
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59
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Zettl U, Knoll A, Tsarkova L. Effect of confinement on the mesoscale and macroscopic swelling of thin block copolymer films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:6610-6617. [PMID: 20027996 DOI: 10.1021/la903922y] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report on the swelling behavior and the corresponding morphological behavior of cylinder-forming polystyrene-b-polybutadiene diblock copolymers, which are confined to several layers of structures. The equilibration of thin films has been done under controlled atmosphere of a nonselective solvent. In situ spectroscopic ellipsometry measurements revealed more than 10% increase of the solvent uptake with decreasing film thickness. With scanning force microscopy of the microphase separated patterns in quenched films, the correlation between the degree of the long-range order of cylinder domains and the degree of the macroscopic swelling has been established. In the case of spontaneously formed micrometer-sized topographic features with discreet film thickness (terraces), the increased solvent uptake by thinner films holds true even for isolated terraces on the mesoscale. The observation of nonhomogeneous swelling of the films on the micrometer scale brings novel insights into the properties of confined soft matter, and suggests new approaches toward the fabrication of polymer-based nanostructured responsive materials.
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Affiliation(s)
- Ute Zettl
- Physikalische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany
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60
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Wang X, Ding B, Yu J, Wang M, Pan F. A highly sensitive humidity sensor based on a nanofibrous membrane coated quartz crystal microbalance. NANOTECHNOLOGY 2010; 21:055502. [PMID: 20023313 DOI: 10.1088/0957-4484/21/5/055502] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel humidity sensor was fabricated by electrospinning deposition of nanofibrous polyelectrolyte membranes as sensitive coatings on a quartz crystal microbalance (QCM). The results of sensing experiments indicated that the response of the sensors increased by more than two orders of magnitude with increasing relative humidity (RH) from 6 to 95% at room temperature, exhibiting high sensitivity, and that, in the range of 20-95% RH, the Log(Deltaf) showed good linearity. The sensitivity of fibrous composite polyacrylic acid (PAA)/poly(vinyl alcohol) (PVA) membranes was two times higher than that of the corresponding flat films at 95% RH. Compared with fibrous PAA/PVA membranes, the nanofibrous PAA membranes exhibited remarkably enhanced humidity sensitivity due to their high PAA content and large specific surface area caused by the formation of ultrathin nanowebs among electrospun fibers. Additionally, the resultant sensors exhibited a good reversible behavior and good long term stability.
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Affiliation(s)
- Xianfeng Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
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61
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Lee HS, Contarino M, Umashankara M, Schön A, Freire E, Smith AB, Chaiken IM, Penn LS. Use of the quartz crystal microbalance to monitor ligand-induced conformational rearrangements in HIV-1 envelope protein gp120. Anal Bioanal Chem 2009; 396:1143-52. [PMID: 20016882 DOI: 10.1007/s00216-009-3313-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 11/10/2009] [Accepted: 11/12/2009] [Indexed: 11/25/2022]
Abstract
We evaluated the potential of a quartz crystal microbalance with dissipation monitoring (QCM-D) to provide a sensitive, label-free method for detecting the conformational rearrangement of glycoprotein gp120 upon binding to different ligands. This glycoprotein is normally found on the envelope of the HIV-1 virus and is involved in viral entry into host cells. It was immobilized on the surface of the sensing element of the QCM-D and was exposed to individual solutions of several different small-molecule inhibitors as well as to a solution of a soluble form of the host cell receptor to which gp120 binds. Instrument responses to ligand-triggered changes were in qualitative agreement with conformational changes as suggested by other biophysical methods.
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Affiliation(s)
- Hyun-Su Lee
- Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA
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62
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Wang W, Jin Y, Su Z. Spectroscopic Study on Water Diffusion in Poly(ester urethane) Block Copolymer Matrix. J Phys Chem B 2009; 113:15742-6. [DOI: 10.1021/jp906718t] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, and Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, 130022, P. R. China
| | - Ying Jin
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, and Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, 130022, P. R. China
| | - Zhaohui Su
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, and Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, 130022, P. R. China
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63
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64
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Lee HS, Penn LS. Evidence for relative radius of gyration as the criterion for selective diffusion behavior of polymer brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:7983-7989. [PMID: 19388629 DOI: 10.1021/la900468n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
When exposed to a dilute solution of free species, the polymer brush functions as a selective barrier to diffusion. Experiments with linear polymer chains and dendrimers of various sizes demonstrated that the selection criterion is relative size, i.e., radius of the free species (radius of gyration for linear chains and simple radius for dendrimers) relative to the radius of gyration of the chains composing the brush. This suggests that linear chains do not necessarily assume extended conformations as they diffuse into a brush but have conformations similar to those of nanoscale spherical inclusions.
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Affiliation(s)
- Hyun-Su Lee
- Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA
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65
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Karul A, Tan KT, White CC, Hunston DL, Marshall ST, Akgun B, Satija SK, Soles CL, Vogt BD. Impact of polymer modulus/chain mobility on water accumulation at polymer/metal oxide interfaces. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.04.064] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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66
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Lee D, Ashcraft JN, Verploegen E, Pashkovski E, Weitz DA. Permeability of model stratum corneum lipid membrane measured using quartz crystal microbalance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5762-5766. [PMID: 19435292 DOI: 10.1021/la804105t] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The stratum corneum (SC) is the outermost layer of the epidermis. Stacked intercellular lipid membranes found in the SC play a crucial role in regulating water transport through the skin. Despite the importance of this role of the SC lipid membranes, only a few studies have presented quantitative methods to measure the permeability of water in SC lipid membranes. In this work, we present a new method to determine the water permeability of a model SC lipid membrane using a quartz crystal microbalance (QCM). We investigate a model SC lipid membrane comprising an equimolar mixture of brain ceramide (CER), cholesterol (CHO), and palmitic acid (PA), and use QCM to determine the diffusivity (D), solubility (S,) and permeability (P) of water vapor in the model SC lipid membrane.
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Affiliation(s)
- Daeyeon Lee
- School of Engineering and Applied Sciences and Department of Physics, Harvard University, Cambridge, Massachusetts, 02138, USA
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67
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Ahn SI, Kim JH, Kim JH, Jung JC, Chang T, Ree M, Zin WC. Polarity effect near the surface and interface of thin supported polymer films: X-ray reflectivity study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5667-5673. [PMID: 19275197 DOI: 10.1021/la804260t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Four homopolymer films (poly(methyl methacrylate) (PMMA), poly(4-vinylpyridine) (P4VP), polystyrene (PS), and poly(alpha-methyl styrene) (PAMS)) with different interactions with native Si oxide on Si wafers and three random copolymer films (PS-ran-PMMA) with different mole fractions were investigated with the X-ray reflectivity (XRR) method. The electron density profile of each film was obtained by fitting the results of the XRR measurements. A new data correction technique that uses the vertical real beam profile and a fitting method that uses the distorted wave Born approximation were combined to overcome the sensitivity limitations of XRR analysis. The results show that the chemical structures of polymer pendant groups and the interactions between the polymer films and the native Si oxide layer are strongly correlated with the density profiles of the films near the surfaces and interfaces. Two general types of electron density profiles were found that are characterized by the polarity of the pendant group of the polymer. The reproducibility and credibility of the fitting technique were also thoroughly tested.
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Affiliation(s)
- Sung Il Ahn
- Department of Materials Science and Engineering, POSTECH, Pohang-city, Korea
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68
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Shi L, Ghezzi M, Caminati G, Lo Nostro P, Grady BP, Striolo A. Adsorption isotherms of aqueous C12E6 and cetyltrimethylammonium bromide surfactants on solid surfaces in the presence of low molecular weight coadsorbents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5536-5544. [PMID: 19382783 DOI: 10.1021/la8041988] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this work, we evaluate the effects of the low molecular weight compounds toluene, phenol, and 1-hexanol on the adsorption of two surfactants on one solid surface. The surfactants are cetyltrimethylammonium bromide (CTAB, cationic) and hexaethylene glycol monododecyl ether (C12E6, nonionic). The surface is gold, although X-ray photoelectron spectroscopic analysis reveals the presence of a large number of oxygenated sites that render the surface hydrophilic (contact angle 10 degrees). Adsorption isotherms are measured using a quartz crystal microbalance with dissipation monitoring (QCM-D). Although our measurements do not allow the determination of the morphology of the aggregates directly, we rationalize our results by referring to AFM images from the literature. On the basis of primarily the dissipative signal and on AFM studies done by others, our results are consistent with CTAB forming a patchy cylindrical structure and C12E6 likely yielding a monolayer structure. The presence of cosolutes almost doubles the mass of surface aggregates and increases the rigidness of the aggregates for CTAB, consistent with a morphological change from cylinders to flat bilayers. Part of the increase in adsorbed mass is likely due to increased surface area covered by admicelles. For C12E6, cosolutes cause small changes in the mass adsorption and essentially no change in the flexibility of surface aggregates.
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Affiliation(s)
- Liu Shi
- School of Chemical, Biological and Materials Engineering, Institute for Applied Surfactant Research, University of Oklahoma, Norman, OK 73019, USA
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69
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Khazaei J, Mohammadi N. Effect of temperature on hydration kinetics of sesame seeds (Sesamum indicum L.). J FOOD ENG 2009. [DOI: 10.1016/j.jfoodeng.2008.10.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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70
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Vapor-induced swelling of supported methacrylic and siloxane polymer films: Determination of interaction parameters. J Appl Polym Sci 2009. [DOI: 10.1002/app.31100] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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71
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Tokarev I, Motornov M, Minko S. Molecular-engineered stimuli-responsive thin polymer film: a platform for the development of integrated multifunctional intelligent materials. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b906765e] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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72
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Doping of polyaniline films with organic sulfonic acids in aqueous media and the effect of water on these doped films. Eur Polym J 2008. [DOI: 10.1016/j.eurpolymj.2008.08.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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73
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Lee HS, Penn LS. In Situ Study of Polymer Brushes as Selective Barriers to Diffusion. Macromolecules 2008. [DOI: 10.1021/ma8009307] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyun-Su Lee
- Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104
| | - Lynn S. Penn
- Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104
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74
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75
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Formulation and properties of a model two-component nanocomposite coating from organophilic nanoclays. JOURNAL OF POLYMER RESEARCH 2008. [DOI: 10.1007/s10965-008-9180-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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76
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Ayad MM, A Zaki E. Quartz crystal microbalance and spectroscopy measurements for acid doping in polyaniline films. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2008; 9:015007. [PMID: 27877944 PMCID: PMC5099813 DOI: 10.1088/1468-6996/9/1/015007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Revised: 03/13/2008] [Accepted: 10/11/2007] [Indexed: 06/06/2023]
Abstract
We investigated the doping of thin polyaniline (PANI) films, prepared by the chemical oxidation of aniline, with different acids. The initial step in the investigation is the preparation of PANI films from aqueous hydrochloric acid solution. This is followed by dedoping with ammonia to obtain a PANI base, which is subsequently doped with strong acids (e.g. hydrochloric, sulfuric, phosphoric and trichloroacetic acids) and with a weak acid (acetic acid). The dopant weight fraction ( w ), which is connected with the gain of mass during the doping of PANI, was determined in situ using a quartz crystal microbalance (QCM). The behavior of PANI upon doping with different anions derived from strong acids indicates that both proton and the anion uptake into the polymer chains occur sharply, rapidly, completely, and reversibly. However the uptake in the case in acetic acid is characterized by slow diffusion. The doping was studied at different concentrations of acetic acid. A second cycle of dedoping-redoping was also performed. The kinetics of the doping reaction is dominated by Fickian diffusion kinetics. The diffusion coefficients (D) of the dopant ions into the PANI chains were determined using the QCM and by UV-Vis absorption spectroscopy in the range of (0.076-1.64)× 10-15 cm2 s-1. It was found that D in the second cycle of doping is larger than that evaluated from the first cycle of doping for high concentrations of acetic acid. D for the diffusion and for the dopant ion expulsion from the PANI chains was also determined during the redoping process. It was found that D for acetic acid ions in the doping process is larger than that calculated for the dedoping process.
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Affiliation(s)
- Mohamad M Ayad
- Department of Chemistry, Faculty of Science, University of Tanta, Tanta, Egypt
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77
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78
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Mukherjee M, Singh A, Daillant J, Menelle A, Cousin F. Effect of Solvent−Polymer Interaction in Swelling Dynamics of Ultrathin Polyacrylamide Films: A Neutron and X-ray Reflectivity Study. Macromolecules 2007. [DOI: 10.1021/ma061745d] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Mukherjee
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata-700064, India, LIONS, Service de Chimie Moléculaire, bât. 125, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, and Laboratoire Leon Brillouin, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - Amarjeet Singh
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata-700064, India, LIONS, Service de Chimie Moléculaire, bât. 125, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, and Laboratoire Leon Brillouin, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - J. Daillant
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata-700064, India, LIONS, Service de Chimie Moléculaire, bât. 125, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, and Laboratoire Leon Brillouin, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - Alain Menelle
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata-700064, India, LIONS, Service de Chimie Moléculaire, bât. 125, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, and Laboratoire Leon Brillouin, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - F. Cousin
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata-700064, India, LIONS, Service de Chimie Moléculaire, bât. 125, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, and Laboratoire Leon Brillouin, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
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79
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Ahn SI, Kim JH, Zin WC. Effect of water-contact on the roughness of patterned photoresist investigated by AFM analysis. J Appl Polym Sci 2007. [DOI: 10.1002/app.25718] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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80
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Maiti M, Bhowmick AK. Effect of polymer–clay interaction on solvent transport behavior of fluoroelastomer–clay nanocomposites and prediction of aspect ratio of nanoclay. J Appl Polym Sci 2007. [DOI: 10.1002/app.26052] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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81
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Stefanescu EA, Schexnailder PJ, Dundigalla A, Negulescu II, Schmidt G. Structure and thermal properties of multilayered Laponite/PEO nanocomposite films. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.08.051] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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82
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Manoli K, Goustouridis D, Chatzandroulis S, Raptis I, Valamontes ES, Sanopoulou M. Vapor sorption in thin supported polymer films studied by white light interferometry. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.06.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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83
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Study of the solid–liquid interface of hydroxyl-terminated hyperbranched aromatic polyesters (HBP-OH) in aqueous media. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.10.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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84
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Singh A, Mukherjee M. Effect of Polymer−Particle Interaction in Swelling Dynamics of Ultrathin Nanocomposite Films. Macromolecules 2005. [DOI: 10.1021/ma050836s] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amarjeet Singh
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - M. Mukherjee
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
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85
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Huang H, Xu Y, Low HY. Effects of film thickness on moisture sorption, glass transition temperature and morphology of poly(chloro-p-xylylene) film. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.05.076] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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86
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Vogt BD, Soles CL, Lee HJ, Lin EK, Wu WL. Moisture absorption into ultrathin hydrophilic polymer films on different substrate surfaces. POLYMER 2005. [DOI: 10.1016/j.polymer.2004.11.114] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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87
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Pei Z, Anderson H, Aastrup T, Ramström O. Study of real-time lectin-carbohydrate interactions on the surface of a quartz crystal microbalance. Biosens Bioelectron 2004; 21:60-6. [PMID: 15967351 DOI: 10.1016/j.bios.2004.10.006] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2004] [Revised: 10/11/2004] [Accepted: 10/11/2004] [Indexed: 11/29/2022]
Abstract
A quartz crystal microbalance (QCM) biosensor system for lectin-carbohydrate interactions has been developed. Yeast mannan was immobilised on polystyrene-coated quartz crystals, and interactions tested with the lectin concanavalin A (Con A). The biosensor could be easily operated, where mannan immobilisation and all binding analyses were performed in real-time using a flow-through system. The apparent binding constant for yeast mannan to Con A was estimated to be 0.4 microM, well in accordance to reported literature values. In addition, the effective concentration values (EC50-values) for a series of mannose/mannoside ligands, acting as competitors to the mannan/Con A interaction, were determined to range from 0.18 to 5.3 mM, in good correlation with a related enzyme-labelled lectin assay (ELLA) protocol.
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Affiliation(s)
- Zhichao Pei
- KTH-Royal Institute of Technology, Department of Chemistry, Teknikringen 30, S-10044 Stockholm, Sweden
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88
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Jiang C, Markutsya S, Pikus Y, Tsukruk VV. Freely suspended nanocomposite membranes as highly sensitive sensors. NATURE MATERIALS 2004; 3:721-728. [PMID: 15448680 DOI: 10.1038/nmat1212] [Citation(s) in RCA: 213] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2004] [Accepted: 07/26/2004] [Indexed: 05/24/2023]
Abstract
Highly sensitive sensor arrays are in high demand for prospective applications in remote sensing and imaging. Measuring microscopic deflections of compliant micromembranes and cantilevers is developing into one of the most versatile approaches for thermal, acoustic and chemical sensing. Here, we report on an innovative fabrication of compliant nanocomposite membranes with nanoscale thickness showing extraordinary sensitivity and dynamic range, which makes them candidates for a new generation of membrane-based sensor arrays. These nanomembranes with a thickness of 25-70 nm, which can be freely suspended over large (hundred micrometres) openings are fabricated with molecular precision by time-efficient, spin-assisted layer-by-layer assembly. They are designed as multilayered molecular composites made of a combination of polymeric monolayers and a metal nanoparticle intralayer. We demonstrate that these nanocomposite membranes possess unparalleled sensitivity and a unique autorecovering ability. The membrane nanostructure that is responsible for these outstanding properties combines multilayered polymer/nanoparticle organization, high polymer-chain orientation, and a pre-stretched state.
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Affiliation(s)
- Chaoyang Jiang
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA
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