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61.
Siddhartha Asthana Sasidhar Varanasi Richard M. Lemert 《Journal of polymer science. Part A, Polymer chemistry》1996,34(10):1993-2001
2-Vinyloxy ethyl phthalimide (ImVE) was polymerized using 1-(isobutoxy) ethyl acetate as the initiator in the presence of ethyl aluminum dichloride and either ethyl acetate or ethyl benzoate. The resulting polymers have a narrow molecular weight distribution, and their molecular weight can be controlled within a narrow range by varying the monomer and initiator concentrations. Diblock copolymers with n-butyl vinyl ether can also be formed. The behavior of the polymerization is consistent with a living cationic mechanism. A brief comparison of the title system with other initiating systems is also presented. © 1996 John Wiley & Sons, Inc. 相似文献
62.
Uthpala M. Garusinghe Swambabu Varanasi Gil Garnier Warren Batchelor 《Cellulose (London, England)》2017,24(6):2511-2521
Flexible nanocellulose composites with silica nanoparticle loading from 5 to 77 wt% and tunable pore size were made and characterised. The pore structure of the new composites can be controlled (100–1000 nm to 10–60 nm) by adjusting the silica nanoparticle content. Composites were prepared by first complexing nanoparticles with a cationic dimethylaminoethyl methacrylate polyacrylamide, followed by retaining this complex in a nanocellulose fibre network. High retention of nanoparticles resulted. The structural changes and pore size distribution of the composites were characterised through scanning electron microscopy (SEM) and mercury porosimetry analysis, respectively. The heavily loaded composites formed packed bed structures of nanoparticles. Film thickness was approximately constant for composites with low loading, indicating that nanoparticles filled gaps created by nanocellulose fibres without altering their structure. Film thickness increased drastically for high loading because of the new packed bed structure. Unexpectedly, within the investigated loading range, the level of the tensile index on nanocellulose mass basis remained constant, showing that the silica nanoparticles did not significantly interfere with the bonding between the cellulose nanofibres. This hierarchically engineered material remains flexible at all loadings, and its unique packing enables use in applications requiring nanocellulose composites with controlled pore structure and high surface area. 相似文献
63.
Beppler BK Varanasi KS Garoff S Evmenenko G Woods K 《Langmuir : the ACS journal of surfaces and colloids》2008,24(13):6705-6711
Soluble surfactants are often deposited from volatile solvents through moving contact lines. In this study, we demonstrate that altering the flow field near such a contact line fundamentally changes the deposited surfactant structure. At slow contact line speeds, the substrate emerges dry. A densely packed, tilted monolayer of surfactant is deposited along the solid-vapor interface from the rolling fluid motion at the contact line. At faster speeds, the substrate emerges with an evaporating thin film entrained on its surface. Surfactant is confined in the film in a constantly increasing concentration environment. Monodisperse crystalline islands nucleate and grow on the surface with sizes and shapes controlled by varying the deposition conditions. These results contrast with disordered deposits that result from evaporation at a pinned contact line. Our results suggest that dip-coating with control of dipping speed and evaporation rate may provide better control of deposition through contact lines of evaporating solvents. 相似文献
64.
David K. Wang Srinivas Varanasi Peter M. Fredericks David J.T. Hill Anne L. Symons Andrew K. Whittaker Firas Rasoul 《Journal of polymer science. Part A, Polymer chemistry》2013,51(24):5163-5176
A series of the biodegradable copolyester hydrogels was prepared using a redox‐initiated polymerization with a constant 1:9 mole ratio of the Boltorn‐based acrylate and diacrylate triblock comacromonomers. The Boltorn® macromonomer was derived from the hyperbranched polyester Boltorn H20, which was functionalized at each terminus with poly(ethylene glycol) acrylate, and the diacrylate triblock macromonomer was poly (lactide‐b‐ethylene glycol‐b‐lactide) diacrylate. The hydrolysis of the copolyesters at pH 7.4 in a phosphate buffered saline solution at 37 °C was studied using ATR‐FTIR spectroscopy. It was found that the presence of the Boltorn, the PEG, and lactide block lengths both play vital roles in determining the structure‐property relationships in these materials. The ATR‐FTIR studies showed that with increasing lactide segment length, the rate of ester hydrolysis increased due to the increased concentration of the hydrolytically sensitive poly(lactic acid) (PLA) ester groups in the network. However, incorporation of Boltorn into the PLA‐PEG‐PLA copolymer did not significantly change the kinetic rate constant for hydrolysis of the PLA segments. The cytocompatibility of a typical one of these materials in the presence of its degradation by‐products was assessed using cultured osteoblasts from the rat. The hydrogel was degraded for 28 days and found to be cytocompatible with osteoblasts over days 23 to 28 of the hydrolysis period. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 5163–5176 相似文献
65.
Varanasi Murali Balaram Dharmesh Parmar Bulusu B Teja Shivprakash Rathnam Jangala Venkateswara Rao Bhavesh Dasandi 《Biomedical chromatography : BMC》2010,24(8):863-867
A rapid and sensitive high‐performance liquid chromatography and electrospray tandem mass spectrometry method was developed and validated for estimation of fulvestrant in rabbit plasma using liquid–liquid extraction. The separation and quantification of fulvestrant were achieved by reverse‐phase chromatography on a Sunfire C18 column (50 × 2.1. i.d., 3.5 μm) with isocratic elution at a flow rate of 300 μL/min using norethistrone as an internal standard from 500 μL plasma sample. The method was validated over the concentration range from 0.092 to 16.937 ng/mL with a lower limit of detection of 0.023 ng/mL. The intra‐day and inter‐day accuracy and precision were within 10%. The recovery was 85 and 90% for fulvestrant and norethistrone respectively. The chromatographic run time was only 2.5 min. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
66.
P. Varanasi 《Journal of Quantitative Spectroscopy & Radiative Transfer》1983,30(6):497-504
Spectral transmittance measurements have been performed on N2-broadened lines of 12C2H2 and 12C13CH2 in the 13.7 μm region at 153,200, and 296 K. From line-by-line comparison of observed and computed spectral transmittance, line strengths, half-widths, and their dependence on temperature have been deduced for conditions relevant to the atmospheres of Jupiter, Saturn, Titan, and Earth. 相似文献
67.
Prasad Varanasi S.J. Kim 《Journal of Quantitative Spectroscopy & Radiative Transfer》1981,25(4):301-305
Spectral transmission measurements have been performed at 300°K in the v6-fundamental band of 12CH3D. Using the measured wave numbers and the calculated relative intensities of Pinkley et al, for all of the important transitions between 1100 and 1180 cm-1, a constant hydrogen-broadened line width of 0.075 cm-1 -atm-1, and Sv = 63.6 cm-2 -atm-1, we have obtained excellent agreement between calculated and observed spectral transmission data. 相似文献
68.
Prasad Varanasi Sunil Sarangi 《Journal of Quantitative Spectroscopy & Radiative Transfer》1975,15(6):473-482
Intensities and nitrogen-broadened half-widths of lines R(0), R(8) and R(16) in the fundamental band of 12C16O have been measured at 83°K, 100°K, 150°K, 200°K and 298°K. The intensities of several other lines in the P- and R-branches of the band have also been measured at 298°K. The absolute intensity derived from the line intensity data using the Herman-Wallis formula is S°v = 273 ± 10 cm-2atm-1 at S.T.P. A separate measurement employing the Wilson-Wells-Penner-Weber method has yielded S°v = 277 ± 4 cm-2 atm-1 at S.T.P. Both of these values are within 6 per cent of most of the previously published direct measurements of this parameter. The values for the line intensities reported earlier by other authors are lower by nearly 16 per cent. 相似文献
69.
G.D.T. Tejwani P. Varanasi K. Fox 《Journal of Quantitative Spectroscopy & Radiative Transfer》1975,15(3):243-254
Pressure-broadened widths of CH4 lines have been calculated, using the recent formulation for tetrahedral molecules by Varanasi in the framework of the Anderson-Tsao-Curnutte theory. The present work deals mainly with lines of the R-branch of the ν3-fundamental at 300°K, for the range 1≤J≤30 and 0≤K≤18, and for the F species. In the case of CH4-N2 and CH4-O2 collisions, octopole-quadrupole, octopole-hexadecapole, hexadecapole-quadrupole, hexadecapole-hexadecapole, dispersion and overlap interactions have been included. Broadening by noble gases was treated in terms of dispersion and overlap interactions. The value obtained in the present work by comparing theoretical and experimental results for γ0CH4?N2 is not far from the magnitude deduced in studies of the far-i.r. collision-induced absorption spectra of methane. A magnitude for the hexadecapole moment of |ΦCH4|=3·0×10?42 esu cm4 was also determined. The calculated and measured linewidths are in good agreement, except in CH4-Ar collisions. In the latter case, the theoretical values are appreciably lower than the experimental ones, which suggests that induced interactions may have to be included. 相似文献
70.