Viscosities of Benzene-<sup>d6</sup> and Cyclohexane-<sup>d12</sup>

Dixon, Joseph A.; Schiessler, Robert W.

doi:10.1021/j150515a012

Cited by 38 publications

(13 citation statements)

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“…4 summarizes the evaluated Γ z and the theoretical value of Γ z obtained by Eq. 3 shown by the dotted line with the values T = 312K and η s = 0.767mPa·s [10]. The Zimm theory is predicting the Q 3 dependence of Γ z .…”

Section: Resultsmentioning

confidence: 89%

Dynamics of Polystyrene in a Theta Solvent Investigated by Neutron Spin Echo

Endo

2013

J. Phys. Soc. Jpn.

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Dynamics of polystyrene in cyclohexane at the theta temperature was investigated by neutron spin echo. The intermediate scattering function up to 50 nano seconds could be observed, then the result was quantitatively compared with the Zimm theory, where the Gaussian approximation for polymer dynamics and the preaveraging approximation for hydrodynamics effect are applied. We found that the theory agrees with the experimental result only in low momentum transfer Q range, (Q × b < 1 with the effective bond length b), which deviates gradually at higher Q. The experimentally observed decay rate is approximately factor 0.5 smaller than the theoretical prediction at the experimental Q maximum (Q ≈ 0.1Å −1 ).

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Section: Resultsmentioning

confidence: 89%

Dynamics of Polystyrene in a Theta Solvent Investigated by Neutron Spin Echo

Endo

2013

J. Phys. Soc. Jpn.

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“…A comparison of the viscosities at 298 K used in the original study with those calculated using the literature data and eq is included in SI.3. The references used for both deuteriated − and protiated ,− solvents are detailed in SI.4. Table SI.4 summarizes relevant information for each of the solvents used.…”

Section: Methodsmentioning

confidence: 99%

Improving the Interpretation of Small Molecule Diffusion Coefficients

2018

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Diffusion-ordered NMR spectroscopy (DOSY) is increasingly widely used for the analysis of mixtures by NMR spectroscopy, dispersing the signals of different species according to their diffusion coefficients. DOSY is used primarily to distinguish between the signals of different species, with the interpretation of the diffusion coefficients observed usually being purely qualitative, for example to deduce whether one species is bigger or smaller than another. In principle, the actual values of diffusion coefficient obtained carry important information about the sizes of different species and on interactions between species, but the relationship between diffusion coefficient and molecular mass is in general a very complex one. Here a recently proposed analytical relationship between diffusion coefficient and molecular mass for the restricted case of small organic molecules is tested against a wide range of data from the scientific literature and generalized to cover a range of solvents and temperatures.

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“…The diffusion coefficient was calculated by using the DOSY transform in the MestReNova analysis software. To correlate the diffusion coefficient ( D ) to the solvodynamic radius ( r ) we used the Stokes–Einstein equation below, were k b is Boltzmann’s constant, T is the temperature and η is the dynamic viscosity, which has a value of 0.69 mPa · s for deuterated benzene …”

Section: Experimental Sectionmentioning

confidence: 99%

PbS Nanocrystals Made Using Excess Lead Chloride Have a Halide-Perovskite-Like Surface

et al. 2021

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A clear understanding of the surface of nanocrystals informs our views of nucleation and growth, and allows for tailored ligand exchanges to meet target applications. PbS colloidal quantum dots are attractive for infrared optoelectronic devices, but PbS nanocrystals made using excess PbCl2 (PbS-eCl NCs) have found limited use, despite showing advantageous ensemble properties. Here, we use 1D and 2D 1H NMR to determine that the native passivation of PbS-eCl NCs involves bound oleylammonium. Then, by mapping the set of permissible ligand exchanges, we uncover that the surface of these nanocrystals matches the behavior of lead halide perovskites. Building on this insight, we infer the ligand binding motif and perovskite-like atomic structure that forms a thin, intrinsic shell on the PbS core. Indeed, we show that two-dimensional L2PbCl4 (L = oleylammonium) sheets are readily formed in the reaction mixture prior to the nucleation of PbS-eCl NCs. Our structural model for the surface then allowed us to develop techniques to improve nanocrystal purification, colloidal stability, and the postsynthetic installation of X-type ligands. In all, we show that the synthesis and surface of PbS-eCl NCs should be treated differently compared to traditional PbS NCs prepared from lead oleate, and highlight instead that ligand exchanges developed for lead halide perovskites can translate to this infrared material. The framework that we present for the manipulation of PbS-eCl NCs in solution can advance their wider use in optoelectronic devices.

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Viscosities of Benzene-^d6 and Cyclohexane-^d12

Abstract: no higher than that of the known triplet state of benzene at 3.6 e.v.27'28 (28) Benzene vapor excited with X 2537 Á. (~4.8 e.v.) does not have enough energy to decompose to gaseous product. Cf. J. E.

Cited by 38 publications

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Dynamics of Polystyrene in a Theta Solvent Investigated by Neutron Spin Echo

Dynamics of Polystyrene in a Theta Solvent Investigated by Neutron Spin Echo

Improving the Interpretation of Small Molecule Diffusion Coefficients

PbS Nanocrystals Made Using Excess Lead Chloride Have a Halide-Perovskite-Like Surface

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Viscosities of Benzene-d6 and Cyclohexane-d12

Abstract: no higher than that of the known triplet state of benzene at 3.6 e.v.27'28 (28) Benzene vapor excited with X 2537 Á. (~4.8 e.v.) does not have enough energy to decompose to gaseous product. Cf. J. E.

Cited by 38 publications

References 0 publications

Dynamics of Polystyrene in a Theta Solvent Investigated by Neutron Spin Echo

Dynamics of Polystyrene in a Theta Solvent Investigated by Neutron Spin Echo

Improving the Interpretation of Small Molecule Diffusion Coefficients

PbS Nanocrystals Made Using Excess Lead Chloride Have a Halide-Perovskite-Like Surface

Contact Info

Product

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Viscosities of Benzene-^d6 and Cyclohexane-^d12