Micrometer Scale Adhesion on Nanometer-Scale Patchy Surfaces:  Adhesion Rates, Adhesion Thresholds, and Curvature-Based Selectivity

Langmuir ◽  
2007 ◽  
Vol 23 (9) ◽  
pp. 4782-4791 ◽  
Author(s):  
Maria M. Santore ◽  
Natalia Kozlova
Keyword(s):  
Nanometer Scale ◽  
Scale Adhesion ◽  
Micrometer Scale

Manipulation of Micrometer-Scale Adhesion by Tuning Nanometer-Scale Surface Features

Langmuir ◽  
2006 ◽  
Vol 22 (3) ◽  
pp. 1135-1142 ◽  
Author(s):  
Natalia Kozlova ◽  
Maria M. Santore
Keyword(s):  
Nanometer Scale ◽  
Scale Adhesion ◽  
Surface Features ◽  
Micrometer Scale ◽  
Scale Surface

scholarly journals Ramesh Shrestha, Sheng Shen and Maarten P. de Boer *

Actuators ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 71 ◽  
Author(s):  
Ramesh Shrestha ◽  
Sheng Shen ◽  
Maarten P. de Boer
Keyword(s):  
Thermal Properties ◽  
Molecular Chain ◽  
Nanometer Scale ◽  
Mechanical And Thermal Properties ◽  
Polymer Nanofibers ◽  
Scale Size ◽  
Scale Test ◽  
High Degree ◽  
Micrometer Scale ◽  
Measurement Artifacts

Because they can achieve a high degree of molecular chain alignment in comparison with their bulk counterparts, the mechanical and thermal properties of polymer nanofibers are of great interest. However, due to their nanometer-scale size, it is difficult to manipulate, grip, and test these fibers. Here, we demonstrate simple repeatable methods to transfer as-drawn fibers to micrometer-scale test platforms where their properties can be directly measured. Issues encountered and methods to minimize measurement artifacts are also discussed.

Nanometer-scale features on micrometer-scale surface texturing: A bone histological, gene expression, and nanomechanical study

Bone ◽  
2014 ◽  
Vol 65 ◽  
pp. 25-32 ◽  
Author(s):  
Paulo G. Coelho ◽  
Tadahiro Takayama ◽  
Daniel Yoo ◽  
Ryo Jimbo ◽  
Sanjay Karunagaran ◽  
...  
Keyword(s):  
Gene Expression ◽  
Surface Texturing ◽  
Nanometer Scale ◽  
Micrometer Scale ◽  
Scale Surface

Microstructure and Chemical Variation in Class F Fly Ash Glass

1987 ◽  
Vol 114 ◽  
Author(s):  
J. C. Qian ◽  
E. E. Lachowski ◽  
F. P. Glasser
Keyword(s):  
Phase Separation ◽  
Fly Ash ◽  
Combustion Process ◽  
Glassy Matrix ◽  
Nanometer Scale ◽  
Chemical Variation ◽  
Transmission Electron ◽  
Class F Fly Ash ◽  
Micrometer Scale ◽  
Class F

ABSTRACTFly ash consists of mixtures of crystalline substances in a glassy matrix. This matrix is itself inhomogeneous. The combustion process gives rise to compositional fluctuations typically on a micrometer scale; these fluctuations are preserved in the glass and are gradational. However, high-resolution transmission electron microscopy of Class F ash also reveals the existence of interfaces on a nanometer scale. These arise as a consequence of phase separation. Textures and interfaces typical of spinodal decomposition and possibility also suggestive of classical immiscibility have been observed. It is believed that the occurrence of phase separation resulting in nanometer-scale inhomogeneities will be a feature common to most Class F glasses. The consequences of this complex microstructure to reactivity are not as yet known, but some speculations are presented.

scholarly journals The Synergistic Effect of Leukocyte Platelet-Rich Fibrin and Micrometer/Nanometer Surface Texturing on Bone Healing around Immediately Placed Implants: An Experimental Study in Dogs

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Rodrigo F. Neiva ◽  
Luiz Fernando Gil ◽  
Nick Tovar ◽  
Malvin N. Janal ◽  
Heloisa Fonseca Marao ◽  
...  
Keyword(s):  
Bone Healing ◽  
Mixed Model ◽  
Surface Texturing ◽  
Contralateral Side ◽  
Nanometer Scale ◽  
Textured Surface ◽  
Beagle Dogs ◽  
Implant Surface ◽  
Mixed Model Anova ◽  
Micrometer Scale

Aims. This study evaluated the effects of L-PRF presence and implant surface texture on bone healing around immediately placed implants.Methods. The first mandibular molars of 8 beagle dogs were bilaterally extracted, and implants (Blossom™, Intra-Lock International, Boca Raton, FL) were placed in the mesial or distal extraction sockets in an interpolated fashion per animal. Two implant surfaces were distributed per sockets: (1) dual acid-etched (DAE, micrometer scale textured) and (2) micrometer/nanometer scale textured (Ossean™ surface). L-PRF (Intraspin system, Intra-Lock International) was placed in a split-mouth design to fill the macrogap between implant and socket walls on one side of the mandible. The contralateral side received implants without L-PRF. A mixed-model ANOVA (atα=0.05) evaluated the effect of implant surface, presence of L-PRF, and socket position (mesial or distal), individually or in combination on bone area fraction occupancy (BAFO).Results. BAFO values were significantly higher for the Ossean relative to the DAE surface on the larger mesial socket. The presence of L-PRF resulted in higher BAFO. The Ossean surface and L-PRF presence resulted in significantly higher BAFO.Conclusion.L-PRF and the micro-/nanometer scale textured surface resulted in increased bone formation around immediately placed implants.

Research and Development of Parylene Thin-Film Deposition and Application for Water-Proofing

2012 ◽  
Vol 538-541 ◽  
pp. 23-28
Author(s):  
Wen Cheng Kuo ◽  
Chao Yang Hsu
Keyword(s):  
Thin Film ◽  
Mobile Phone ◽  
Mobile Phones ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Nanometer Scale ◽  
Light Emitting ◽  
Water Proofing ◽  
New Applications ◽  
Micrometer Scale

This research presents the development of parylene thin-film deposition from the micrometer scale to nanometer scale. Processes improved film uniformity by 6% in the nanometer scale to meet the requirements of new applications of parylene, such as the delamination layer of organic light-emitting diodes, the dielectric film of through-silicon-via, and water-proofing mobile phones. The application and process of water-proofing mobile phones is also examined. The tested mobile phone was coated with a 0.5 μm parylene coating and functioned properly while submerged underwater. The mobile phone is still operational; thus, nanoscale parylene deposition is a novel application for water-proofing mobile phones. The application does not concern problems associated with parts assembly or damaged rubber material.

Calcium-Assisted Regulation of the Structures of Porous Carbons at the Micro-Nano Scale

2020 ◽  
Vol 15 (2) ◽  
pp. 284-290
Author(s):  
Ming Li ◽  
Kuihua Han ◽  
Yang Gao ◽  
Zhaocai Teng ◽  
Jinxiao Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Nanometer Scale ◽  
Size Distributions ◽  
Porous Carbons ◽  
Pore Characteristics ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Micrometer Scale ◽  
Micropore Size ◽  
Scanning Electron

Here a facile and effective method was investigated to regulate the microstructures of porous carbons by adjusting the contents of calcium in precursors. The carbonization characteristics of precursors were characterized by thermogravimetric analysis (TGA) and differential thermogravimetric (DTG), and the results show that the weight loss rates of precursors decrease with the increases of calcium contents. The structures of carbonized samples and their derived porous carbons at the micrometer scale were characterized by Scanning electron microscopy (SEM), and the results show that the structures of carbonized samples change regularly with the increases of calcium contents in precursors, and porous carbons can inherit the structures from their corresponding carbonized samples. The pore characteristics of porous carbons at the nanometer scale were characterized by N2 adsorption and desorption, Barrett Joyner and Halenda (BJH) method and Horvath-Kawazoe (HK) method, and the results show that the existence of calcium in precursors can greatly increase the total pore volumes and specific surface areas of porous carbons derived from precursors, and interestingly it can be noticed that the micropore size distributions of porous carbons in the range of 0.58–10 nm are quite similar.

Nanometer Scale Microstructure and Microtexture of Biological Materials Revealed by High Spatial Resolution (15 to 5 kV) EBSD

2011 ◽  
Vol 702-703 ◽  
pp. 924-927 ◽  
Author(s):  
Erika Griesshaber ◽  
Harvinder Singh Ubhi ◽  
Wolfgang W. Schmahl
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
One Dimension ◽  
Nanometer Scale ◽  
Control Mechanisms ◽  
Experimental Conditions ◽  
Individual Grains ◽  
Micrometer Scale ◽  
Microstructure And Microtexture

High resolution EBSD analysis was carried out under specific experimental conditions (15 to 5 kV) on the skeleton of the modern carbonate brachiopod Gryphus vitreus and resolved nano- to microscale preferred crystallographic orientation patterns undetcted so far. As biologic superstructures are formed by controlled nanoparticle assembly it is essential to resolve their internal structure and texture with the highest possible spatial resolution. Low kV EBSD (15 kV and at 5 kV) provides the required resolution. We observe in the investigated carbonate skeletons a strongly interlocking microstructure of concave/convex grains. The interface topology of the interdigitating structure reaches below the micrometer scale. Individual grains reach sizes up to 20 µm (or even more) in one dimension. They show a mosaic spread of several degrees such that they must be addressed as mesocrystals. Even though the shell consists of three different microstructures with completely different crystal morphologies and grain boundary topologies the crystallographic texture of the three layers is similar. This indicates that distinct control mechanisms prevail when the shell is formed.

scholarly journals Surface modifications of Ti6Al4V by a picosecond Nd:YAG laser

2009 ◽  
Vol 27 (1) ◽  
pp. 85-90 ◽  
Author(s):  
M.S. Trtica ◽  
B.B. Radak ◽  
B.M. Gakovic ◽  
D.S. Milovanovic ◽  
D. Batani ◽  
...  
Keyword(s):  
Nd:Yag Laser ◽  
Surface Modifications ◽  
Surface Damage ◽  
Nanometer Scale ◽  
Implant Surface ◽  
Periodic Surface ◽  
Bio Compatibility ◽  
Micrometer Scale ◽  
532 Nm ◽  
Pulse Count

AbstractInteraction of a Nd:YAG laser, operating at wavelengths of 1064 nm (23.6 J cm−2 fluence) or 532 nm (25.9 J cm−2 fluence), and pulse duration of 40 ps, with a titanium-based medical implant Ti6Al4V alloy was studied. Surface damage thresholds were estimated to be 0.9 J cm−2 and 0.25 J cm−2 at laser wavelengths 1064 nm and 532 nm, respectively. At both laser wavelengths, the energy absorbed was mostly converted into thermal energy, forming craters, albeit about 50 times deeper at 1064 nm than at 532 nm. Periodic surface structures (PSS) were also formed with both laser wavelengths, concentric, and radial at micrometer scale (3 µm to 15 µm period), parallel at nanometer scale (800 nm period with the 1064 nm laser, 400 nm with the 532 nm laser). In the case of the 532 nm laser, the concentric structures enlarge their period with accumulating laser pulse count. These features can help roughening of the implant surface and improve bio-compatibility.

scholarly journals Microtopographical guidance of macropinocytic signaling patches

2021 ◽  
Vol 118 (50) ◽  
pp. e2110281118
Author(s):  
Gen Honda ◽  
Nen Saito ◽  
Taihei Fujimori ◽  
Hidenori Hashimura ◽  
Mitsuru J. Nakamura ◽  
...  
Keyword(s):  
Immune Cells ◽  
Large Scale ◽  
Nanometer Scale ◽  
Distinct Mode ◽  
Structured Surfaces ◽  
Curvature Sensing ◽  
Quantitative Image ◽  
Membrane Protrusions ◽  
Particle Ingestion ◽  
Micrometer Scale

In fast-moving cells such as amoeba and immune cells, dendritic actin filaments are spatiotemporally regulated to shape large-scale plasma membrane protrusions. Despite their importance in migration, as well as in particle and liquid ingestion, how their dynamics are affected by micrometer-scale features of the contact surface is still poorly understood. Here, through quantitative image analysis of Dictyostelium on microfabricated surfaces, we show that there is a distinct mode of topographical guidance directed by the macropinocytic membrane cup. Unlike other topographical guidance known to date that depends on nanometer-scale curvature sensing protein or stress fibers, the macropinocytic membrane cup is driven by the Ras/PI3K/F-actin signaling patch and its dependency on the micrometer-scale topographical features, namely PI3K/F-actin–independent accumulation of Ras-GTP at the convex curved surface, PI3K-dependent patch propagation along the convex edge, and its actomyosin-dependent constriction at the concave edge. Mathematical model simulations demonstrate that the topographically dependent initiation, in combination with the mutually defining patch patterning and the membrane deformation, gives rise to the topographical guidance. Our results suggest that the macropinocytic cup is a self-enclosing structure that can support liquid ingestion by default; however, in the presence of structured surfaces, it is directed to faithfully trace bent and bifurcating ridges for particle ingestion and cell guidance.

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