Layer-by-layer growth and decomposition of an organic crystal observed in real time by atomic force microscopy

AbstractThe vascular smooth muscle cell (VSMC) mechanical properties not only provide intrinsic cellular functions, but also influence many vascular and circulation functions in physiology. In this report, the VSMCs of thoracic aorta from 16 week age Wistar-Kyoto normotensive rats (WKY) and spontaneously hypertensive rats (SHR) were used as research subjects to reveal hypertension mechanism at a single cell level using atomic force microscopy (AFM). The apparent elastic modulus was significantly increased in VSMCs from SHRs compared to those from WKYs. Treatment with cytochalasin D (CD), ML7, Y27632 and lysophosphatidic acid (LPA) modulated VSMC stiffness of WKYs and SHRs. A spectral analysis approach was applied to further investigate the time-dependent change in VSMC elasticity of WKYs and SHRs. This report demonstrated the efficacy of real-time analysis of VSMC elasticity by AFM nano-indentation, and revealed real-time functional differences in biomechanical characteristics of VSMCs with drug treatments.

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Conducting Polymer nanoComposites (CPC): Nanocharacterisation of layer by layer sprayed PMMA-CNT vapour sensors by Atomic force Microscopy in current Sensing Mode (CS-AFM)

MRS Proceedings ◽

10.1557/proc-1143-kk02-06 ◽

2008 ◽

Vol 1143 ◽

Cited By ~ 1

Author(s):

Bijandra Kumar ◽

Mickaël Castro ◽

Jianbo Lu ◽

Jean-François Feller

Keyword(s):

Atomic Force Microscopy ◽

Spray Deposition ◽

Dynamic Mode ◽

Layer By Layer ◽

Initial State ◽

Contact Mode ◽

Current Sensing ◽

Multi Wall Carbon Nanotubes ◽

Force Microscopy ◽

Atomic Force

ABSTRACTOrganic vapour sensors based on poly (methylmethacrylate)-multi-wall carbon nanotubes (PMMA-CNT) conductive polymer nanocomposite (CPC) were developed via layer by layer technique by spray deposition. CPC Sensors were exposed to three different classes of solvents (chloroform, methanol and water) and their chemo-electrical properties were followed as a function of CNTcontent in dynamic mode. Detection time was found to be shorter than that necessary for full recovery of initial state. CNT real three dimensional network has been visualized by Atomic force microscopy in a field assisted intermittent contact mode. More interestingly real conductive network system and electrical ability of CPC have been explored by current-sensing atomic force microscopy (CS-AFM). Realistic effect of voltage on electrical conductivity has been found linear.

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Sensor Referenced Real-Time Videolization of Atomic Force Microscopy for Nanomanipulations

IEEE/ASME Transactions on Mechatronics ◽

10.1109/tmech.2008.917859 ◽

2008 ◽

Vol 13 (1) ◽

pp. 76-85 ◽

Cited By ~ 62

Author(s):

Lianqing Liu ◽

Yilun Luo ◽

Ning Xi ◽

Yuechao Wang ◽

Jiangbo Zhang ◽

...

Keyword(s):

Atomic Force Microscopy ◽

Real Time ◽

Force Microscopy ◽

Atomic Force

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In Situ Real-Time Observation of Polymer Folded-Chain Crystallization by Atomic Force Microscopy at the Molecular Level

Macromolecules ◽

10.1021/acs.macromol.8b01428 ◽

2018 ◽

Vol 51 (19) ◽

pp. 7629-7636 ◽

Cited By ~ 14

Author(s):

Yuki Ono ◽

Jiro Kumaki

Keyword(s):

Atomic Force Microscopy ◽

Real Time ◽

Molecular Level ◽

Force Microscopy ◽

Atomic Force ◽

Time Observation ◽

Real Time Observation

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ATOMIC FORCE MICROSCOPY STUDIES ON GROWTH STEPS AND 2D NUCLEI ON THE {100} FACES OF DEUTERATED L-ARGININE PHOSPHATE CRYSTALS

Surface Review and Letters ◽

10.1142/s0218625x04006359 ◽

2004 ◽

Vol 11 (04n05) ◽

pp. 379-383 ◽

Cited By ~ 2

Author(s):

Y. L. GENG ◽

D. XU ◽

D. L. SUN ◽

W. DU ◽

H. Y. LIU ◽

...

Keyword(s):

Growth Rate ◽

Atomic Force Microscopy ◽

Growth Mechanism ◽

Layer Growth ◽

Ex Situ ◽

Force Microscopy ◽

Atomic Force

Growth steps and 2D nuclei of the {100} faces of the deuterated L-arginine phosphate (DLAP) crystals have been studied using ex-situ atomic force microscopy (AFM). Straight steps along the b direction as well as meandered steps are detected. The bunched steps have wider terraces than the elementary ones, which are supposed to result from the slower growth rate of the former than the latter. Many 2D nuclei exist on the step terraces and edges acting as the growth sources. Occasionally, 2D islands generated by 2D nuclei could also be observed. In conclusion, the crystal grows by layer growth mechanism.

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