Structure of Neat Liquids Consisting of (Perfect and Nearly) Tetrahedral Molecules

Pothoczki, Szilvia; Temleitner, László; Pusztai, László

doi:10.1021/acs.chemrev.5b00308

Cited by 27 publications

(15 citation statements)

References 429 publications

(959 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[39][40][41][42] It is based on the experimental size distribution of spheres, and calculation of I(q) of homogeneous interacting polydisperse spheres with an excluded volume. [39][40][41][42] It is based on the experimental size distribution of spheres, and calculation of I(q) of homogeneous interacting polydisperse spheres with an excluded volume.…”

Section: Methodsmentioning

confidence: 99%

Surface modification of alumina-coated silica nanoparticles in aqueous sols with phosphonic acids and impact on nanoparticle interactions

Pauly

Genix

Alauzun

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

It is often necessary to tailor nanoparticle (NP) interactions and their compatibility with a polymer matrix by grafting organic groups, but the commonly used silanization route offers little versatility, particularly in water. Herein, alumina-coated silica NPs in aqueous sols have been modified for the first time with low molecular-weight phosphonic acids (PAs) bearing organic groups of various hydrophobicities and charges: propyl, pentyl and octyl PAs, and two PAs bearing hydrophilic groups, either a neutral diethylene glycol (DEPA) or a potentially charged carboxylic acid (CAPA) group. The interactions and aggregation in the sols have been investigated using zeta potential measurements, dynamic light scattering, transmission electron microscopy, and small-angle scattering methods. The surface modification has been studied using FTIR and (31)P MAS NMR spectroscopies. Both high grafting density ρ and high hydrophobicity of the groups on the PAs induced aggregation, whereas suspensions of NPs grafted by DEPA remained stable up to the highest ρ. Unexpectedly, CAPA-modified NPs showed aggregation even at low ρ, suggesting that the carboxylic end group was also grafted to the surface. Surface modification of aqueous sols with PAs allows thus for the grafting of a higher density and a wider variety of organic groups than organosilanes, offering an increased control of the interactions between NPs, which is of interest for designing waterborne nanocomposites.

show abstract

Section: Methodsmentioning

confidence: 99%

Surface modification of alumina-coated silica nanoparticles in aqueous sols with phosphonic acids and impact on nanoparticle interactions

Pauly

Genix

Alauzun

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…However, by far the most dominant structural features are collinear correlations. An important distinction between the previous RMC investigations [25][26][27] and the present study using EPSR is that the reference potentials used in the EPSR approach include Coulomb charges on the atoms (cf . Table S1) allowing the possibility of electrostatic ordering in a fashion which is consistent with the diffraction data.…”

Section: The Most Likely Positions Of H Atoms In the Coordinationmentioning

confidence: 99%

Polar stacking of molecules in liquid chloroform

et al. 2015

View full text Add to dashboard Cite

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

show abstract

“…Trihalomethanes (CHX3) are important in a wide range of environmental settings and industrial applications. [1] To emphasise the chemical similarities with formic acid, they are often called haloforms and can be prepared using the well-known haloform reaction. [2] Fluoroform (CHF3) is a non-ozone depleting greenhouse gas that is used in refrigeration.…”

Section: Introductionmentioning

confidence: 99%

Local structure and orientational ordering in liquid bromoform

2019

View full text Add to dashboard Cite

The neutron diffraction data of liquid bromoform (CHBr3) at 25°C was analysed using the Empirical Potential Structure Refinement technique in combination with H/D isotopic substitution. Compared to liquid chloroform (CHCl3), CHBr3 displays more spatially defined intermolecular contacts. A preference for polar stacking with collinear alignment of dipole moments is observed for the most closely approaching CHBr3 molecules, although to a lesser extent than in chloroform. Consistent with this and in line with dielectric spectroscopy, the Kirkwood correlation factor from the structural model of CHBr3 is smaller than that of CHCl3. The net antiparallel alignment of dipole moments in CHBr3, as suggested by dielectric spectroscopy, must be due to weak but persistent longrange orientation correlations in CHBr3, which counteract the local polar stacking.

show abstract

Structure of Neat Liquids Consisting of (Perfect and Nearly) Tetrahedral Molecules

Cited by 27 publications

References 429 publications

Surface modification of alumina-coated silica nanoparticles in aqueous sols with phosphonic acids and impact on nanoparticle interactions

Surface modification of alumina-coated silica nanoparticles in aqueous sols with phosphonic acids and impact on nanoparticle interactions

Polar stacking of molecules in liquid chloroform

Local structure and orientational ordering in liquid bromoform

Contact Info

Product

Resources

About