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  • 1
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    The process of EDC-NHS cross-linking of reconstituted collagen fibres increases collagen fibrillar order and alignment (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-11-06
    Description: We describe the production of collagen fibre bundles through a multi-strand, semi-continuous extrusion process. Cross-linking using an EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide), NHS (N-hydroxysuccinimide) combination was considered. Atomic Force Microscopy and Raman spectroscopy focused on how cross-linking affected the collagen fibrillar structure. In the cross-linked fibres, a clear fibrillar structure comparable to native collagen was observed which was not observed in the non-cross-linked fibre. The amide III doublet in the Raman spectra provided additional evidence of alignment in the cross-linked fibres. Raman spectroscopy also indicated no residual polyethylene glycol (from the fibre forming buffer) or water in any of the fibres.
    Electronic ISSN: 2166-532X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by American Institute of Physics (AIP)
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  • 2
    Electronic Resource
    Electronic Resource
    A Fourier transform infrared study of the D and 13C substituted C2H3 vinyl radical in solid argon (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2738-2742 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Fourier transform infrared (FTIR) isotopic matrix study of the C2H3 vinyl radical produced by the vacuum UV photolysis of ethylene has been carried out in the midinfrared from 250 to 4800 cm−1. A variety of carbon-13 and deuterium substituted ethylene parent molecules were used to form various isotopomers of C2H3. On the basis of its isotopic behavior and by comparison with Dupuis and Wendoloski's GVB ab initio calculations, an absorption at 900 cm−1 has been assigned to the ν7, out-of-plane bending mode of C2H3. The following values for ν7 have been obtained for vinyl isotopomers: 887 cm−1 for 12CH2=12CD; 797 cm−1 for 12CD2=12CH; 704 cm−1 for 12CD2=12CD; 889 cm−1 for 13CH2=12CH; 895 cm−1 for 12CH2=13CH; and 894 cm−1 for 13CH2=13CH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455025
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  • 3
    Electronic Resource
    Electronic Resource
    Some implications from matrix studies for the structure and vibrational assignments of SiC2 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3399-3401 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453938
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  • 4
    Electronic Resource
    Electronic Resource
    FTIR study of D and 13C substituted C2H in solid argon (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2600-2605 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An extensive FTIR isotopic matrix study using deuterium and carbon-13 has been conducted on the midinfrared spectrum at 250 to 4800 cm−1 of the C2H ethynyl radical produced by the vacuum UV photolysis of acetylene. An absorption at 2104 cm−1 can be assigned to a combination band involving one quantum each of the ν2, bending and the ν3, C–C stretching vibrations. This result implies an unexpectedly low value of ∼260 cm−1 for ν2. Identification of the combination band in this work gives the first indication of the value of the ν2 fundamental, which has not otherwise been observed. The results of carbon-13 substitution on a band at 3610 cm−1 do not appear to be consistent with its previous assignment to the ν1, C–H stretching vibration of C2H. However, carbon-13 shifts for the C2D band at 2798 cm−1 support its assignment to ν1. Absorptions corresponding to several vibronic bands of the A 2Π←X 2Σ+ transition, which have recently been reported in gas phase studies using color center laser spectroscopy, are observed in the matrix spectra, confirming that these bands originate from the lowest vibrational level of the ground state. The effects of carbon-13 substitution on these bands are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452062
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  • 5
    Electronic Resource
    Electronic Resource
    Fourier transform far infrared spectroscopy of the ν'3 vibration of SiC2 in Ar at 10 K (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5424-5428 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Fourier transform study of the vibrational spectrum of SiC2 produced by vaporizing mixtures of silicon and carbon-12 or carbon-13 at 2900 K and quenching the products in argon at 10 K, has enabled the identification for the first time of the ν‘3(b2) vibrational mode, which the results of an earlier matrix study had suggested should lie in the far infrared. The assignment of a frequency observed at 160.4 cm−1 to the ν″3 mode is confirmed by isotopic data and supported by the predictions of ab initio calculations. Optimized force constants have been derived using the frequencies of the newly assigned mode, the previously reported, ν‘1(a1)=1741.3 and ν″2(a1)=824.3 cm−1 vibrations, and their values on single and double carbon-13 substitution. Two models, cyclic and T-shaped, are discussed for the molecule, which is of C2V symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459638
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  • 6
    Electronic Resource
    Electronic Resource
    FTIR matrix isolation study of carbon-13 substituted SiC2 (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 4788-4790 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The products from vaporizing silicon carbide at 2900 K and quenching in argon at 8 K have been studied using Fourier transform infrared spectroscopy. Under the assumption of various possible geometries, calculations based on two vibrations observed at 1741.1 and 824.4 cm−1 were made to predict frequencies for SiC2 singly and doubly substituted with carbon-13. Comparison with the spectra observed on isotopic substitution shows conclusively that these vibrations belong to SiC2, and that the molecule is cyclic (i.e., possesses C2v symmetry) in the ground state. This geometry is in agreement with recent results from a rotational analysis of the band system at 500 nm. Force constants derived in the present study suggest that the silicon atom is singly bonded to two doubly bonded carbon atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448696
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical reaction dynamics with stochastic potentials below the high-friction limit (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 2430-2438 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Thermally activated escape over a fluctuating barrier is studied by numerical simulations of the Langevin equation. A class of merged harmonic oscillator potentials are used to model barrier fluctuations continuously over the entire domain of the dynamics. Though the friction constant in the Langevin equation is Ohmic (local), the correlation in the stochastic potentials is taken to be exponential (nonlocal) with a specified decay constant. These models have previously been restricted to the overdamped regime. In this limit, the high friction constants ensure the system's thermalization despite the additional forces acting on the system effected by the stochastic potential of mean force. To insure that equipartition is obeyed below the overdamped regime, the friction constant is modified so as to dissipate this excess energy. This phenomenological choice is exact if the fluctuations in the stochastic potential are induced by a Gaussian random force and are either uniform across the configuration space or the dynamics are determined only at the transition state. Otherwise it provides agreement with the exponent of the equilibrium distribution to second order in the inverse temperature. With this scheme, the stochastic dynamics are shown to exhibit both the Kramers turnover and resonant activation over a wide range of friction and decay constants. The zero and infinite limits of the latter are also obtained using both simulations and analytic rate formulas. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1386422
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  • 8
    Electronic Resource
    Electronic Resource
    Application of InP:Fe photoconductors as a fast and sensitive soft x-ray detector and bolometer (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 846-846 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recently we have demonstrated that InP:Fe photoconductors are fast (FWHM∼150 ps), sensitive (2.7×10−3 A/W), and flat response soft x-ray detectors using synchrotron radiation from the Stanford Synchrotron Radiation Laboratory.1 We have applied these to the measurement of the radiation emitted by a collapsing annular gas (argon) puff z-pinch plasma. The detector was used in two modes of operation: (1) a filtered soft x-ray detector as a pinch diagnostic and (2) a fast unfiltered bolometer to measure the total radiated power as a function of time. We will compare the performance of the photoconductors to other common fast x-ray detectors and bolometers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138064
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  • 9
    Electronic Resource
    Electronic Resource
    A low threshold, room temperature 1.64 μm Yb:Er:Y3Al5O12 waveguide laser (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7651-7653 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room temperature 1.64 μm laser operation of Yb:Er:Y3Al5O12 has been achieved using a planar waveguide grown by liquid phase epitaxy. A comparatively low threshold of 17 mW was achieved for this transition indicating low waveguide propagation loss for this material and suggesting good prospects for low threshold 3 μm and upconversion visible lasers based on this system. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357939
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of ion implanted waveguides in Nd:YAG (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3440-3446 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion implantation into Nd:YAG has been used to produce waveguides which are capable of supporting laser action. The refractive index profiles have been characterized as a function of ion dose and energy, implant temperature, and subsequent thermal annealing. Transmission losses down to 1.2 dB/cm have been obtained in the optimized waveguides. There is a temperature independent index enhancement of ∼0.15% in the electronic stopping (guiding) region. The nuclear collision damage is temperature dependent, and shows an initial index increase (∼0.3% for dose 1 × 1016 ions/cm2), but a subsequent decrease of up to several percent, which forms an optical barrier, as has been observed in many other crystalline materials. The best mode confinement and attenuation is obtained by utilizing the low dose nuclear index enhancement produced by several equally spaced implants (multiple energy) to give a broad well with Δn∼0.25%. Several unusual features of the profiles are reported and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348962
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