@article{shim_park_srinivasarao_2008, title={Forced coating of polypropylene fibers with non-wetting fluids: The scaling of the film thickness}, volume={22}, ISSN={["0217-9849"]}, DOI={10.1142/s0217984908016649}, abstractNote={ The film thickness of free-meniscus coating of a polymeric fiber with a non-wetting fluid was investigated. A polypropylene monofilament fiber was coated with various glycerol/water mixtures. With a small capillary number (Ca), a detectable liquid film did not form on the fiber due to the non-wettability of the fiber-liquid system. Above a certain threshold velocity, liquid was forced to wet the fiber by hydrodynamic forces, thus forming a film. However, the film thickness in this region is lower than Landau–Levich–Derjaguin (LLD) theoretical value for the wetting system. At a moderate velocity range, the film thickness increases to a value predicted either by the LLD law or White–Tallmadge (WT) model, depending on the velocity, mimicking that of the wetting system. At a higher Ca, the film thickness increases much more rapidly, deviating from any predictions, due to the inertial effect. }, number={22}, journal={MODERN PHYSICS LETTERS B}, author={Shim, E. and Park, Jung Ok and Srinivasarao, Mohan}, year={2008}, month={Aug}, pages={2043–2053} }
 @article{burke_park_srinivasarao_khan_2005, title={A novel enzymatic technique for limiting drug mobility in a hydrogel matrix}, volume={104}, ISSN={["1873-4995"]}, DOI={10.1016/j.jconrel.2005.01.017}, abstractNote={An oral colon specific drug delivery platform has been developed to facilitate targetted release of therapeutic proteins as well as small molecule drugs. A simple enzymatic procedure is used to modify the molecular architecture of a lightly chemically crosslinked galactomannan hydrogel as well as a model drug-galactomannan oligomer conjugate, fluoroisocynate (FITC) tagged guar oligomer, to entrap the model drug. The enzyme-modified hydrogel retains the drug until it reaches the colonic environment where bacteria secrete enzymes (namely beta-mannanase) to degrade the gel and release the drug molecule. Laser scanning confocal microscopy combined with fluorescence recovery after photobleaching is used to quantify the diffusion of the drug conjugate. The diffusion coefficient of solutes in the lightly crosslinked galactomannan hydrogel is approximately equal to the diffusion coefficient in the guar solution for simple diffusional drug loading. After drug loading, alpha-galactosidase treatment generates additional physical crosslinks in the hydrogel matrix as well as between the drug-oligomer conjugate and the hydrogel, which reduces diffusion of the drug-oligomer conjugate significantly. Degradation of the hydrogel by beta-mannanase results in a slow and controlled rate of FITC-guar oligomer diffusion, which generates an extended release profile for the model drug.}, number={1}, journal={JOURNAL OF CONTROLLED RELEASE}, author={Burke, MD and Park, JO and Srinivasarao, M and Khan, SA}, year={2005}, month={May}, pages={141–153} }
 @article{pai_srinivasarao_khan_2002, title={Evolution of microstructure and rheology in mixed polysaccharide systems}, volume={35}, ISSN={["1520-5835"]}, DOI={10.1021/ma0115545}, abstractNote={Synergistic biopolymer blends composed of xanthan and enzymatically modified guar galactomannan are investigated in terms of their time-dependent properties. In particular, a side-chain cleaving enzyme, α-galactosidase, is used to cleave off galactose sugar units from guar to produce modified galactomannans with varying galactose contents of 25.2 and 16.2%. Laser scanning confocal microscopy and dynamic rheology are used to monitor the properties of each of these two modified guar gum in solution as well as in blends with xanthan as they are allowed to age over a period of 3 weeks. Our results indicate that solutions of guar with a higher galactose (25.2%) content undergo no rheological change over the period of observation and show a constant gel elastic modulus (G‘) in blends with xanthan. Confocal images of the solutions and the blends also indicate that the systems are stable over a period of 3 weeks. In contrast, guar gum with a lower galactose content (16.2%) forms interchain associations in solutio...}, number={5}, journal={MACROMOLECULES}, author={Pai, V and Srinivasarao, M and Khan, SA}, year={2002}, month={Feb}, pages={1699–1707} }
 @article{park_rene_srinivasarao_doucet_russo_2002, title={Study of dye diffusion in nylon 66 fibers: Fluorescence recovery after photobleaching}, volume={35}, journal={Macromolecules}, author={Park, J. O. and Rene, C. R. and Srinivasarao, M. and Doucet, G. and Russo, P.}, year={2002} }
 @article{srinivasarao_collings_philips_patel_2001, title={Three-dimensionally ordered array of air bubbles in a polymer film}, volume={292}, ISSN={["0036-8075"]}, DOI={10.1126/science.1057887}, abstractNote={We report the formation of a three-dimensionally ordered array of air bubbles of monodisperse pore size in a polymer film through a templating mechanism based on thermocapillary convection. Dilute solutions of a simple, coil-like polymer in a volatile solvent are cast on a glass slide in the presence of moist air flowing across the surface. Evaporative cooling and the generation of an ordered array of breath figures leads to the formation of multilayers of hexagonally packed water droplets that are preserved in the final, solid polymer film as spherical air bubbles. The dimensions of these bubbles can be controlled simply by changing the velocity of the airflow across the surface. When these three-dimensionally ordered macroporous materials have pore dimensions comparable to the wavelength of visible light, they are of interest as photonic band gaps and optical stop-bands.}, number={5514}, journal={SCIENCE}, author={Srinivasarao, M and Collings, D and Philips, A and Patel, S}, year={2001}, month={Apr}, pages={79–83} }
 @article{burke_park_srinivasarao_khan_2000, title={Diffusion of macromolecules in polymer solutions and gels: A laser scanning confocal microscopy study}, volume={33}, ISSN={["1520-5835"]}, DOI={10.1021/ma000786l}, abstractNote={Laser scanning confocal microscopy combined with fluorescence recovery after photobleaching is an effective tool to measure the diffusion coefficients of macromolecules in cross-linked hydrogels and polymer solutions. In this study, the effects of enzyme treatment on the diffusion of macromolecules (FITC-dextran) in guar solutions and titanium-guar hydrogels are examined. Enzyme treatment with β-mannanase, a polymer backbone cleaving enzyme, quickly increases the diffusion coefficient of the probe molecules in both solutions and hydrogels to that in water. Enzyme treatment of guar solutions and hydrogels with α-galactosidase, a side chain cleaving enzyme, displays a unique behavior due to changes in the fine structure of guar. The removal of galactose branches from the mannan backbone of guar creates additional hyperentanglements (i.e., cross-links), which reduce the water holding capacity of guar and induce syneresis. If the depth at which the diffusion coefficient is measured remains constant, a minimum...}, number={20}, journal={MACROMOLECULES}, author={Burke, MD and Park, JO and Srinivasarao, M and Khan, SA}, year={2000}, month={Oct}, pages={7500–7507} }
 @article{song_srinivasarao_mcgregor_2000, title={Laser scanning confocal microscope measurement of dye diffusion coefficients in fibers}, volume={33}, journal={Macromolecules}, author={Song, Y. and Srinivasarao, M. and McGregor, R.}, year={2000}, pages={4478} }
 @article{song_srinivasarao_tonelli_balik_mcgregor_2000, title={Laser scanning confocal microscopy study of dye diffusion in fibers}, volume={33}, ISSN={["1520-5835"]}, DOI={10.1021/ma991584w}, abstractNote={The diffusion of fluorescein into nylon-66 fibers has been studied for the first time by laser scanning confocal microscopy (LSCM). LSCM makes it possible to noninvasively obtain high-resolution three-dimensional images of the spatial distribution of dyes (fluorescein) in fibers dyed for various length of times. Integration over the dye distribution yields the total amount of dye in the fiber, which is found to be in close agreement with that determined by UV−vis spectrophotometry after dissolving the fibers. Thus, the diffusion coefficients determined noninvasively by LSCM ((6.9 ± 1.0) × 10-11 cm2/s) and the destructive traditional means ((7.8 ± 1.9) × 10-11 cm2/s) also agree. The LSCM method has several significant advantages. Among these are its speed, nondestructive nature, and the ability not only to determine the total dye content of the fiber but also to image the dye distribution profile across the fiber diameter. This latter ability is demonstrated to be important to understanding the visual appe...}, number={12}, journal={MACROMOLECULES}, author={Song, Y and Srinivasarao, M and Tonelli, A and Balik, CM and McGregor, R}, year={2000}, month={Jun}, pages={4478–4485} }
 @article{davis_singletary_srinivasarao_knoff_ramasubramanian_2000, title={Microstructure organization in para-aramid fibers}, volume={70}, ISSN={["0040-5175"]}, DOI={10.1177/004051750007001102}, abstractNote={ The existence of "lateral birefringence," i.e., the difference between the refractive index for light polarized parallel to the fiber radius and light polarized perpendicular to the radius in the cross-sectional plane, combined with the existence of electron diffraction contrast "bands" in longitudinal fiber sections has led to work appearing to indicate that para-aramid fibers, in particular poly(para-phenylene terephthalamide), have an almost crystallographically perfect orthotropic structure in which the hydrogen bonds are all parallel to fiber radii. Optical path difference profiles, calculated based on the proposed orthotropic structure, are in reasonable qualitative agreement with interference microscope data. Quantitatively, however, the orthotropic structure is only partially developed based on published values of the principle refractive indices. Furthermore, the degree to which this structure is developed varies with distance from the fiber axis in some fibers' types. }, number={11}, journal={TEXTILE RESEARCH JOURNAL}, author={Davis, H and Singletary, J and Srinivasarao, M and Knoff, W and Ramasubramanian, MK}, year={2000}, month={Nov}, pages={945–950} }
 @misc{srinivasarao_1999, title={Chirality and polymers}, volume={4}, ISSN={["1879-0399"]}, DOI={10.1016/s1359-0294(99)00024-2}, abstractNote={Optical activity, since its discovery, has been a fascinating field, from the seemingly simple issues related to transfer of (chiral) information to its cosmic connections and the origin of life itself. There has been much progress made on both fronts which include the discovery of strong infrared circular polarization from dust scattering to the more down to earth knowledge of how chiral information is transferred to solutes by chiral additives, piezoelectricity and opalescent elastic networks. The progress made in the past few years and their implications for various aspects of chirality are discussed.}, number={2}, journal={CURRENT OPINION IN COLLOID & INTERFACE SCIENCE}, author={Srinivasarao, M}, year={1999}, month={Apr}, pages={147–152} }
 @misc{srinivasarao_1999, title={Nano-optics in the biological world: Beetles, butterflies, birds, and moths}, volume={99}, ISSN={["0009-2665"]}, DOI={10.1021/cr970080y}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNano-Optics in the Biological World: Beetles, Butterflies, Birds, and MothsMohan SrinivasaraoView Author Information Fiber and Polymer Science Program, North Carolina State University, Raleigh, North Carolina 27695-8301 Cite this: Chem. Rev. 1999, 99, 7, 1935–1962Publication Date (Web):July 14, 1999Publication History Received5 March 1999Revised23 April 1999Published online14 July 1999Published inissue 1 July 1999https://doi.org/10.1021/cr970080yCopyright © 1999 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views6303Altmetric-Citations476LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit Read OnlinePDF (758 KB) Get e-AlertsSUBJECTS:Chemical structure,Color,Light,Optical properties,Quantum mechanics Get e-Alerts}, number={7}, journal={CHEMICAL REVIEWS}, author={Srinivasarao, M}, year={1999}, month={Jul}, pages={1935–1961} }
 @article{song_srinivasarao_tonelli_1999, title={Study of dye diffusion in fibers by laser scanning confocal microscopy}, volume={148}, ISSN={["1521-3900"]}, DOI={10.1002/masy.19991480129}, abstractNote={Abstract}, journal={MACROMOLECULAR SYMPOSIA}, author={Song, Y and Srinivasarao, M and Tonelli, A}, year={1999}, month={Dec}, pages={395–402} }
 @article{marjanski_srinivasarao_mirau_1998, title={Solid-state multipulse proton Nuclear Magnetic Resonance (NMR) characterization of self-assembling polymer films}, volume={12}, ISSN={["0926-2040"]}, DOI={10.1016/S0926-2040(98)00057-5}, abstractNote={Multipulse solid-state proton Nuclear Magnetic Resonance (NMR) has been used to study the domain structure in poly(styrene-b-isoprene-b-styrene) triblock copolymers in clear and self-assembled polymer films. Films containing ordered arrays of microcavities (3-5 microm) were obtained by casting the polymer from carbon disulfide solution in a moist environment, while clear films were obtained by solvent evaporation under nitrogen. The domain sizes for the polystyrene and polyisoprene blocks were measured by proton spin diffusion using the dipolar filter pulse sequence. The domain sizes for the dispersed phase and the long period were measured to be in the range of 3-6 nm, depending on the polymer molecular weight, and no differences domain size were observed for the clear and the self-assembled polymer films.}, number={2-3}, journal={SOLID STATE NUCLEAR MAGNETIC RESONANCE}, author={Marjanski, M and Srinivasarao, M and Mirau, PA}, year={1998}, month={Sep}, pages={113–118} }
 @article{janarthanan_garrett_stein_srinivasarao_1997, title={Adhesion enhancement in immiscible polymer bilayer using oriented macroscopic roughness}, volume={38}, ISSN={["0032-3861"]}, DOI={10.1016/S0032-3861(96)00447-8}, abstractNote={The use of oriented macroscopic roughness to enhance the effective adhesion between two immiscible polymers was demonstrated. Bilayer specimens of polycarbonate and poly(styrene-co-acrylonitrile) (SAN) were produced with rough interfaces by scribing grooves of varying depths and spacings into the polycarbonate (PC) before joining the layers. The SAN, having a significantly lower glass transition temperature than polycarbonate, flows into the grooves during annealing at temperatures just over the PC glass transition, creating a mechanically interlocking interface. Subsequent measurements of bilayer interfacial fracture toughness showed up to a twenty-fold increase from that of a smooth interface when grooves were oriented perpendicular to the direction of interfacial crack propagation. The increase in toughness was shown to be greater as grooves were spaced closer together, and as groove depths were increased. Propagation of interface cracks followed a stick-slip mechanism, slowing considerably at each groove. Analysis of fracture surfaces indicates the increase in toughness to be mainly due to cohesive failure and deformation of the polymers at the grooves. Interface toughness was also enhanced with grooves scribed parallel to the propagation direction, but to a lesser degree than with perpendicular orientation.}, number={1}, journal={POLYMER}, author={Janarthanan, V and Garrett, PD and Stein, RS and Srinivasarao, M}, year={1997}, month={Jan}, pages={105–111} }
 @inbook{srinivasarao_padilla_1997, title={Biologically inspired design: Color on wings}, booktitle={Materials for optical limiting II}, publisher={Pittsburgh, Pa.: Materials Research Society}, author={Srinivasarao, M. and Padilla, L.}, editor={al., R. Sutherland...Editor}, year={1997} }
 @article{mirau_srinivasarao_1997, title={NMR characterization of liquid crystal polymer interactions in polymer-dispersed liquid crystals}, volume={51}, ISSN={["0003-7028"]}, DOI={10.1366/0003702971939299}, abstractNote={ Solid-state nuclear magnetic resonance (NMR) and optical microscopy have been used to study liquid crystal–polymer interactions in polymer-dispersed liquid crystals (PDLCs) composed of the E7 liquid crystal mixture and poly( n-butyl methacrylate) or poly(isobutyl methacrylate). As previously reported, the droplets adopt a bipolar configuration in the PDLCs using poly( n-butyl methacrylate) as the matrix material and a radial configuration in those using poly(isobutyl methacrylate). The NMR signals from the E7 cannot be detected in the bulk state by using magic angle spinning and cross-polarization because of its liquid-like properties. The E7 and the polymer signals are only weakly cross-polarized in 60:40 E7/poly( n-butyl methacrylate) PDLCs but are strongly cross-polarized in the PDLCs with poly(isobutyl methacrylate). We suggest that the differences are due to a change in the surface-anchoring conditions and that NMR spectroscopy may provide a molecular-level probe of the forces that control droplet configuration and the electro-optical properties of these materials. }, number={11}, journal={APPLIED SPECTROSCOPY}, author={Mirau, PA and Srinivasarao, M}, year={1997}, month={Nov}, pages={1639–1643} }