Slow Aggregation of Titania Nanocrystals in Acidic Hydrosols

2011 ◽  
Vol 1352 ◽  
Author(s):  
Olga Pavlova-Verevkina ◽  
Ludmila Ozerina ◽  
Natalia Golubko ◽  
Abdelkrim Chemseddine
Keyword(s):  
Thermal Treatment ◽  
Small Angle ◽  
Room Temperature ◽  
Initial Rate ◽  
Low Ph ◽  
X Ray ◽  
X Ray Scattering ◽  
Slow Aggregation ◽  
Kinetics Of ◽  
Hcl Solution

ABSTRACTThe kinetics of slow aggregation of monodisperse TiO2 nanocrystals in the acidic hydrosols at room temperature was studied for months by turbidimetry. The dependence of the initial rate of aggregation on the pH was calculated. The comparison of results obtained by turbidimetry and small angle X-ray scattering permits to suppose that very loose aggregates form at the low pH in HCl solution. The dependencies obtained in this work for room temperature can be taken into consideration at the tuning of TiO2 nanoparticles morphology through thermal treatment of hydrosols.

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

In Situ Wide- and Small-Angle X-ray Scattering Study of Melting Kinetics of Isotactic Poly(propylene)

2003 ◽  
Vol 36 (11) ◽  
pp. 4042-4050 ◽  
Author(s):  
Patrick S. Dai ◽  
Peggy Cebe ◽  
Malcolm Capel ◽  
Rufina G. Alamo ◽  
Leo Mandelkern
Keyword(s):  
Small Angle ◽  
X Ray ◽  
X Ray Scattering ◽  
Melting Kinetics ◽  
Scattering Study ◽  
Poly Propylene ◽  
Kinetics Of ◽  
Ray Scattering

scholarly journals Pore orientation effects on the kinetics of mesostructure loss in surfactant templated titania thin films

2016 ◽  
Vol 18 (4) ◽  
pp. 2896-2905 ◽  
Author(s):  
Saikat Das ◽  
Suraj Nagpure ◽  
Ravinder K. Garlapalli ◽  
Qingliu Wu ◽  
Syed Z. Islam ◽  
...  
Keyword(s):  
Thin Films ◽  
Small Angle ◽  
Grazing Incidence ◽  
Thermally Induced ◽  
X Ray ◽  
Cylindrical Pore ◽  
X Ray Scattering ◽  
Orientation Effects ◽  
Titania Films ◽  
Kinetics Of

Grazing incidence small angle X-ray scattering (GISAXS) shows that thin titania films with uniform orthogonal cylindrical pore orientation are stabilized against thermally induced mesostructure loss.

Time-Resolved Small-Angle X-ray Scattering Study of the Kinetics of Disorder−Order Transition in a Triblock Copolymer in a Selective Solvent for the Middle Block

2003 ◽  
Vol 36 (21) ◽  
pp. 8097-8106 ◽  
Author(s):  
Huifen Nie ◽  
Rama Bansil ◽  
Karl Ludwig ◽  
Milos Steinhart ◽  
Čestmír Koňák ◽  
...  
Keyword(s):  
Small Angle ◽  
Triblock Copolymer ◽  
Order Transition ◽  
Selective Solvent ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Kinetics Of ◽  
Ray Scattering

A New Insight into Growth Mechanism and Kinetics of Mesoporous Silica Nanoparticles by in Situ Small Angle X-ray Scattering

Langmuir ◽  
2015 ◽  
Vol 31 (30) ◽  
pp. 8478-8487 ◽  
Author(s):  
Zhifeng Yi ◽  
Ludovic F. Dumée ◽  
Christopher J. Garvey ◽  
Chunfang Feng ◽  
Fenghua She ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Growth Mechanism ◽  
Small Angle ◽  
Mesoporous Silica Nanoparticles ◽  
X Ray ◽  
X Ray Scattering ◽  
Mechanism And Kinetics ◽  
Kinetics Of ◽  
Insight Into

Kinetics of crystallization of biodegradable PHA copolymers: a combined X-ray scattering and micro-indentation study

2011 ◽  
Vol 1301 ◽  
Author(s):  
Maraolina Domínguez-Díaz ◽  
Araceli Flores ◽  
Angel Romo-Uribe ◽  
Rodolfo Cruz-Silva
Keyword(s):  
Room Temperature ◽  
Degree Of Crystallinity ◽  
Indentation Hardness ◽  
X Ray ◽  
X Ray Scattering ◽  
Biodegradable Poly ◽  
Pha Copolymers ◽  
Ice Water ◽  
Kinetics Of ◽  
Ray Scattering

ABSTRACTWide Angle X-ray scattering (WAXS) and indentation hardness have been used to study the development of crystallinity at room temperature of biodegradable poly(hydroxybutyrate) (PHB) and its copolymer with hydroxyvalerate (PHB/HV) containing 12% of valerate. Measurements were carried out immediately after quenching the samples from the molten state (200 ºC) in ice water and over two weeks of storage at room temperature. WAXS showed that the crystallization of the PHB-based polymers initiated within the first minutes of storage at room temperature, the copolymer displaying a higher rate of crystallization than the homopolymer. For all samples, the degree of crystallinity,α, nearly reached a plateau value within the first hour of crystallization. Concurrently to the development of crystallinity, microhardness values,H, clearly rose as crystallization occurred. Monitoring the crystallization for over two weeks showed that after the rapid increase ofαandH, there was a slow monotonic growth of these properties. A correlation between nanostructure and microhardness is found at all stages of the crystallization process.

scholarly journals Self-assembly of block copolymers under non-isothermal annealing conditions as revealed by grazing-incidence small-angle X-ray scattering

2020 ◽  
Vol 27 (5) ◽  
pp. 1278-1288 ◽  
Author(s):  
Marta Fernández-Regúlez ◽  
Eduardo Solano ◽  
Laura Evangelio ◽  
Steven Gottlieb ◽  
Christian Pinto-Gómez ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Small Angle ◽  
Self Assembly ◽  
Isothermal Annealing ◽  
Grazing Incidence ◽  
The Self ◽  
X Ray ◽  
Annealing Conditions ◽  
X Ray Scattering ◽  
Kinetics Of

An accurate knowledge of the parameters governing the kinetics of block copolymer self-assembly is crucial to model the time- and temperature-dependent evolution of pattern formation during annealing as well as to predict the most efficient conditions for the formation of defect-free patterns. Here, the self-assembly kinetics of a lamellar PS-b-PMMA block copolymer under both isothermal and non-isothermal annealing conditions are investigated by combining grazing-incidence small-angle X-ray scattering (GISAXS) experiments with a novel modelling methodology that accounts for the annealing history of the block copolymer film before it reaches the isothermal regime. Such a model allows conventional studies in isothermal annealing conditions to be extended to the more realistic case of non-isothermal annealing and prediction of the accuracy in the determination of the relevant parameters, namely the correlation length and the growth exponent, which define the kinetics of the self-assembly.

scholarly journals Structural Kinetics of MsbA Investigated by Stopped-Flow Time-Resolved Small-Angle X-Ray Scattering

Structure ◽  
2020 ◽  
Vol 28 (3) ◽  
pp. 348-354.e3 ◽  
Author(s):  
Inokentijs Josts ◽  
Yunyun Gao ◽  
Diana C.F. Monteiro ◽  
Stephan Niebling ◽  
Julius Nitsche ◽  
...  
Keyword(s):  
Small Angle ◽  
Flow Time ◽  
Stopped Flow ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering
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