Bitumen Morphology as Observed by Phase-Detection Atomic Force Microscopy

2008 ◽  
Vol 587-588 ◽  
pp. 981-985 ◽  
Author(s):  
Elisabete R. Costa ◽  
Rogerio Colaço ◽  
António Correia Diogo
Keyword(s):  
Atomic Force Microscopy ◽  
Strong Dependence ◽  
Phase Detection ◽  
Heterogeneous Mixture ◽  
Modified Bitumen ◽  
Force Microscopy ◽  
Atomic Force ◽  
Different Types ◽  
Para Phase

An analysis of the microstructure of several modified bitumen shown by phase detection Atomic Force Microscopy (AFM) is presented here. The phase detection and topographic AFM images, displayed three different types of microstructure: the so-called catana phase domains (beelike structures) dispersed in the peri-phase are present in most of the cases; para-phase domains are also observed in the neighbourhood of both catana and peri-phases. These results are consistent with the picture of bitumen as a heterogeneous mixture, as one should expect. The proportions of all these phases display a rather strong dependence on the nature of the modified bitumen considered, on the concentration of the modifier, as well as on the amount of aging of the mix.

Phase Contrast Imaging in Atomic Force Microscopy

1997 ◽  
Vol 3 (S2) ◽  
pp. 1275-1276
Author(s):  
Sergei Magonov
Keyword(s):  
Atomic Force Microscopy ◽  
Phase Contrast ◽  
Phase Changes ◽  
Phase Imaging ◽  
Phase Detection ◽  
Contrast Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Resonance Frequencies ◽  
Soft Samples

Phase detection in TappingMode™ enhances capabilities of Atomic Force Microscopy (AFM) for soft samples (polymers and biological materials). Changes of amplitude and phase changes of a fast oscillating probe are caused by tip-sample force interactions. Height images reflect the amplitude changes, and in most cases they present a sample topography. Phase images show local differences between phases of free-oscillating probe and of probe interacting with a sample surface. These differences are related to the change of the resonance frequency of the probe either by attractive or repulsive tip-sample forces. Therefore phase detection helps to choose attractive or repulsive force regime for surface imaging and to minimize tip-sample force. For heterogeneous materials the phase imaging allows to distinguish individual components and to visualize their distribution due to differences in phase contrast. This is typically achieved in moderate tapping, when set-point amplitude, Asp, is about half of the amplitude of free-oscillating cantilever, Ao. In contrast, light tapping with Asp close to Ao is best suited for recording a true topography of the topmost surface layer of soft samples. Examples of phase imaging of polymers obtained with a scanning probe microscope Nanoscope® IIIa (Digital Instruments). Si probes (225 μk long, resonance frequencies 150-200 kHz) were used.

Block Copolymer Microdomain Morphologies by Phase Detection Imaging

1996 ◽  
Vol 461 ◽  
Author(s):  
Ph. Leclère ◽  
J. M. Yu ◽  
R. Lazzaroni ◽  
Ph. Dubois ◽  
R. JéRôme ◽  
...  
Keyword(s):  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Phase Detection ◽  
Surface Phase ◽  
Force Microscopy ◽  
Microscopy Technique ◽  
Atomic Force ◽  
Different Types ◽  
Microdomain Structure ◽  
Thermodynamic Processes

ABSTRACTAtomic Force Microscopy with Phase Detection Imaging is used to study the surface microdomain morphology of thick (i.e., ca. 2 mm) films of triblock copolymers, such as polymethylmethacrylate - block - polybutadiene - block - polymethylmethacrylate copolymers prepared by a well-taylored two-step sequential copolymerization promoted by a 1,3-diisopropenylbenzene based difunctional anionie initiator. By means of this new scanning probe microscopy technique, it is shown that the surface exhibits a segregated microphase structure, corresponding to the different types of components predicted theoretically by thermodynamic processes. We investigate the relationships between the size and characteristics of the microdomain structure as a function of the molecular parameters of the constituent polymers. Our data illustrate the interest of Phase Detection Imaging in the elucidation of surface phase separation in block copolymers.

scholarly journals High-speed atomic force microscopy with phase-detection

2012 ◽  
Vol 12 (3) ◽  
pp. 989-994 ◽  
Author(s):  
Donghyeok Lee ◽  
Hyunsoo Lee ◽  
N.S. Lee ◽  
K.B. Kim ◽  
Yongho Seo
Keyword(s):  
Atomic Force Microscopy ◽  
High Speed ◽  
Phase Detection ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Bitumen morphologies by phase-detection atomic force microscopy

2006 ◽  
Vol 221 (1) ◽  
pp. 17-29 ◽  
Author(s):  
J-F. MASSON ◽  
V. LEBLOND ◽  
J. MARGESON
Keyword(s):  
Atomic Force Microscopy ◽  
Phase Detection ◽  
Force Microscopy ◽  
Atomic Force

The effects of different types of additives on growth of biomineral phases investigated by in situ atomic force microscopy

2019 ◽  
Vol 509 ◽  
pp. 8-16 ◽  
Author(s):  
Kang Rae Cho ◽  
Prashant Kulshreshtha ◽  
Kuang Jen J. Wu ◽  
Jong Seto ◽  
S. Roger Qiu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Different Types

Micromorphology and microrheology of modified bitumen by atomic force microscopy

2014 ◽  
Vol 15 (2) ◽  
pp. 300-311 ◽  
Author(s):  
L.M. Rebelo ◽  
P.N. Cavalcante ◽  
J.S. de Sousa ◽  
J. Mendes Filho ◽  
S.A. Soares ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Modified Bitumen ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Tracking On-Surface Chemistry with Atomic Precision

Synlett ◽  
2017 ◽  
Vol 28 (19) ◽  
pp. 2509-2516 ◽  
Author(s):  
Peter Jacobse ◽  
Marc-Etienne Moret ◽  
Robertus Klein Gebbink ◽  
Ingmar Swart
Keyword(s):  
Atomic Force Microscopy ◽  
Single Molecule ◽  
Graphene Nanoribbons ◽  
Single Molecule Level ◽  
Force Microscopy ◽  
The Past ◽  
Atomic Force ◽  
Atomic Precision ◽  
Different Types ◽  
Insight Into

The field of on-surface synthesis has seen a tremendous development in the past decade as an exciting new methodology towards atomically well-defined nanostructures. A strong driving force in this respect is its inherent compatibility with scanning probe techniques, which allows one to ‘view’ the reactants and products at the single-molecule level. In this article, we review the ability of noncontact atomic force microscopy to study on-surface chemical reactions with atomic precision. We highlight recent advances in using noncontact atomic force microscopy to obtain mechanistic insight into reactions and focus on the recently elaborated mechanisms in the formation of different types of graphene nanoribbons.

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