scholarly journals PVP Assisted Synthesis of Hydroxyapatite Nanorods with Tunable Aspect Ratio and Bioactivity

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
A. Joseph Nathanael ◽  
Young Ho Seo ◽  
Tae Hwan Oh
Keyword(s):  
Electron Microscopy ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Xrd Analysis ◽  
Reaction Model ◽  
Morphological Variations ◽  
Viability Analysis ◽  
Selected Area Electron Diffraction ◽  
Length Width

Highly crystalline and reasonably uniform hydroxyapatite (HA) nanorods were prepared by polyvinylpyrrolidone (PVP) assisted hydrothermal synthesis which produces high aspect ratio (length/width) nanorods. The aspect ratio of the nanorods was higher in the presence of PVP and increased with increasing concentrations of PVP. X-ray diffraction (XRD) analysis showed that the HA nanorods were of the hexagonal apatite phase. High resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) patterns confirmed that the nanorods grew in thec-axis direction (preferred orientation). The calculated lattice spacing was ~0.35 nm which is thec-axis value of hexagonal HA. Morphological variations of pristine and PVP added HA were evaluated by field emission scanning electron microscopy (FESEM) and TEM, which revealed that the presence of PVP greatly increased the aspect ratio of the HA nanorods. The formation mechanism of the PVP assisted HA was studied and a possible reaction model was given. Cell viability analysis byin vitrostudies showed encouraging results for the high aspect ratio nanorods and indicated a possibility for tuning the activity based on controlling the aspect ratio.

High Aspect Ratio Hydroxyapatite Nanorods Formed by Polymer Assisted Synthesis

2014 ◽  
Vol 508 ◽  
pp. 52-55
Author(s):  
A. Joseph Nathanael ◽  
R. Yuvakkumar ◽  
Tae Hwan Oh ◽  
Sun Ig Hong
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Morphological Analysis ◽  
Polymer Concentration ◽  
Xrd Analysis ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Length Width ◽  
Size Controlled

High aspect ratio (length/width) of hydroxyapatite (HA) nanorods were prepared by polymer assisted hydrothermal synthesis. The aspect ratio of the nanorods was increased in the presence of polymer in hydrothermal method. Structural analysis was carried out by X-ray diffraction (XRD) analysis to find the purity and the crystal structure of the material. Morphological analysis was carried out by field emission scanning electron microscope (FESEM) to find the morphological variation in the presence of polymer concentration compared to pristine HA. The increased aspect ratio of the HA was visible from the morphological analysis. This shape and size controlled synthesis have an important impact in many field of research.

Fabrication of high-aspect-ratio microstructures in polymer microfluid chips for in vitro single-cell analysis

2016 ◽  
Vol 61 (10) ◽  
pp. 1566-1571 ◽  
Author(s):  
A. S. Bukatin ◽  
I. S. Mukhin ◽  
E. I. Malyshev ◽  
I. V. Kukhtevich ◽  
A. A. Evstrapov ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Single Cell ◽  
High Aspect Ratio ◽  
Single Cell Analysis ◽  
Cell Analysis

scholarly journals Sea of Electrodes Array (SEA): Extremely Dense and High-Count Silicon-Based Electrode Array Technology for High-Resolution High-Bandwidth Interfacing with 3D Neural Structures

2021 ◽  
Author(s):  
Amin Sandoughsaz Zardini ◽  
Behnoush Rostami ◽  
Khalil Najafi ◽  
Vaughn L. Hetrick ◽  
Omar J. Ahmed
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Electrode Array ◽  
High Count ◽  
Array Technology ◽  
High Bandwidth ◽  
Length Width ◽  
Silicon Based ◽  
The Brain

AbstractIn this work, we propose a new silicon-based micro-fabrication technology to fabricate 3D high-density high-electrode-count neural micro-probe arrays scalable to thousands and even millions of individual electrodes with user-defined length, width, shape, and tip profile. This unique technology utilizes DRIE of ultra-high aspect-ratio holes in silicon and refilling them with multiple films to form thousands of individual needles with metal tips making up the “sea-of-electrodes” array (SEA). World-record density of 400 electrodes/mm2 in a 5184-needle array is achieved. The needles are ~0.5-1.2mm long, <20μm wide at the base, and <1μm at the tip. The silicon-based structure of these 3D array probes with sharp tips, makes them stiff enough and easily implantable in the brain to reach a targeted region without failing. Moreover, the high aspect ratio of these extremely fine needles reduces the tissue damage and improves the chronic stability. Functionality of the electrodes is investigated using acute in vivo recording in a rat barrel field cortex under isoflurane anesthesia.

POLYAMIDE/POLYESTERAMIDE BASED NANOFIBERS

2011 ◽  
Vol 04 (04) ◽  
pp. 365-368 ◽  
Author(s):  
LENKA MALINOVÁ ◽  
VÁCLAVA BENEŠOVÁ ◽  
DANIELA LUBASOVÁ ◽  
LENKA MARTINOVÁ ◽  
JAN RODA ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aspect Ratio ◽  
Polymer Solution ◽  
High Aspect Ratio ◽  
Electrospinning Method ◽  
Microscopy Images ◽  
Scanning Electron

The formation of novel high aspect ratio nanofibers from polyesteramides based on ε-caprolactam and ε-caprolactone is reported. Nanofibers were prepared by the electrospinning method from polymer solution. Scanning electron microscopy images of nanofiber layers revealed that the diameter of fibers depended on the nature of the solvent or the mixture of solvents used and especially on the composition of polyesteramides.

Interactions between AlN and SiAlON Ceramics

2008 ◽  
Vol 403 ◽  
pp. 97-98
Author(s):  
A. Kalemtas ◽  
Nurcan Calis Acikbas ◽  
Ferhat Kara ◽  
Hasan Mandal ◽  
Kristoffer Krnel ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aspect Ratio ◽  
Reaction Zone ◽  
High Aspect Ratio ◽  
X Ray ◽  
Plasma Sintering ◽  
Reaction Region ◽  
Spark Plasma ◽  
Scanning Electron

In the present study, interactions between AlN and SiAlON laminated couples were investigated after gas pressure (GPS) and spark plasma sintering (SPS) by scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDX) with the aim to produce laminated composites. In the laminated couples sintered by GPS, a significant reaction zone (~100-150 μm), containing a high aspect ratio of elongated polytypoid grains, was observed at the interface. However, in the case of laminated couples sintered by SPS, a considerably thin reaction region (~2-3 μm) was observed, elongated polytypoid grain formations were also detected.

Particokinetics and in vitro dose of high aspect ratio nanoparticles

Nanoscale ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 5209-5214 ◽  
Author(s):  
Seth Richard Price ◽  
Calum Kinnear ◽  
Sandor Balog
Keyword(s):  
Aspect Ratio ◽  
Cell Cultures ◽  
High Aspect Ratio ◽  
Adherent Cell

Adapting computational particokinetic models to address the dosage of high-aspect ratio nanomaterials for in vitro nanoparticle toxicology assays involving submerged adherent cell cultures.

scholarly journals Correction: High-aspect-ratio water-dispersed gold nanowires incorporated within gelatin methacrylate hydrogels for constructing cardiac tissues in vitro

2020 ◽  
Author(s):  
Xiao-Pei Li ◽  
Kai-Yun Qu ◽  
Feng Zhang ◽  
Han-Ning Jiang ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Gold Nanowires ◽  
Cardiac Tissues ◽  
Dispersed Gold

Correction for ‘High-aspect-ratio water-dispersed gold nanowires incorporated within gelatin methacrylate hydrogels for constructing cardiac tissues in vitro’ by Xiao-Pei Li et al., J. Mater. Chem. B, 2020, 8, 7213–7224, DOI: 10.1039/D0TB00768D.

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