microscopy characterization
Recently Published Documents


TOTAL DOCUMENTS

546
(FIVE YEARS 74)

H-INDEX

41
(FIVE YEARS 4)

Soft Matter ◽  
2022 ◽  
Author(s):  
Peng-Kai Kao ◽  
Michael J Solomon ◽  
Mahesh Ganesan

The linear elasticity of dilute colloidal gels formed from discoidal latex particles is quantified as a function of aspect ratio and modeled by confocal microscopy characterization of their fractal cluster...


Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2635
Author(s):  
Max Powers ◽  
James A. Stewart ◽  
Rémi Dingreville ◽  
Benjamin K. Derby ◽  
Amit Misra

Co-deposited, immiscible alloy systems form hierarchical microstructures under specific deposition conditions that accentuate the difference in constituent element mobility. The mechanism leading to the formation of these unique hierarchical morphologies during the deposition process is difficult to identify, since the characterization of these microstructures is typically carried out post-deposition. We employ phase-field modeling to study the evolution of microstructures during deposition combined with microscopy characterization of experimentally deposited thin films to reveal the origin of the formation mechanism of hierarchical morphologies in co-deposited, immiscible alloy thin films. Our results trace this back to the significant influence of a local compositional driving force that occurs near the surface of the growing thin film. We show that local variations in the concentration of the vapor phase near the surface, resulting in nuclei (i.e., a cluster of atoms) on the film’s surface with an inhomogeneous composition, can trigger the simultaneous evolution of multiple concentration modulations across multiple length scales, leading to hierarchical morphologies. We show that locally, the concentration must be above a certain threshold value in order to generate distinct hierarchical morphologies in a single domain.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xian-Kui Wei ◽  
Sergei Prokhorenko ◽  
Bi-Xia Wang ◽  
Zenghui Liu ◽  
Yu-Juan Xie ◽  
...  

AbstractPhase transition describes a mutational behavior of matter states at a critical transition temperature or external field. Despite the phase-transition orders are well sorted by classic thermodynamic theory, ambiguous situations interposed between the first- and second-order transitions were exposed one after another. Here, we report discovery of phase-transition frustration near a tricritical composition point in ferroelectric Pb(Zr1-xTix)O3. Our multi-scale transmission electron microscopy characterization reveals a number of geometrically frustrated microstructure features such as self-assembled hierarchical domain structure, degeneracy of mesoscale domain tetragonality and decoupled polarization-strain relationship. Associated with deviation from the classic mean-field theory, dielectric critical exponent anomalies and temperature dependent birefringence data unveil that the frustrated transition order stems from intricate competition of short-range polar orders and their decoupling to long-range lattice deformation. With supports from effective Hamiltonian Monte Carlo simulations, our findings point out a potentially universal mechanism to comprehend the abnormal critical phenomena occurring in phase-transition materials.


2021 ◽  
Vol 27 (S1) ◽  
pp. 3140-3143
Author(s):  
Luis Bernardo López-Sosa ◽  
Mario Morales-Máximo ◽  
Rogelio Anastacio-Paulino ◽  
Abraham Custodio-Hernández ◽  
Juan Carlos Corral-Huacuz ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document