Effect of a Calcium Carbonate-Based Dentifrice on in situ Enamel Remineralization

2005 ◽  
Vol 39 (3) ◽  
pp. 255-257 ◽  
Author(s):  
J.A. Cury ◽  
G.S. Simões ◽  
A.A. Del Bel Cury ◽  
N.C. Gonçalves ◽  
C.P.M. Tabchoury
Keyword(s):  
Calcium Carbonate

A TEM study of the microstructure of avian eggshells

1992 ◽  
Vol 50 (2) ◽  
pp. 1102-1103
Author(s):  
S. Q. Xiao ◽  
S. Baden ◽  
A. H. Heuer
Keyword(s):  
Electron Microscope ◽  
Calcium Carbonate ◽  
Nucleation And Growth ◽  
Growth Mechanisms ◽  
Shell Surface ◽  
Thin Sections ◽  
Polycrystalline Metals ◽  
Transmission Electron ◽  
Nucleation And Growth Mechanisms

The avian eggshell is one of the most rapidly mineralizing biological systems known. In situ, 5g of calcium carbonate are crystallized in less than 20 hrs to fabricate the shell. Although there have been much work about the formation of eggshells, controversy about the nucleation and growth mechanisms of the calcite crystals, and their texture in the eggshell, still remain unclear. In this report the microstructure and microchemistry of avian eggshells have been analyzed using transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS).Fresh white and dry brown eggshells were broken and fixed in Karnosky's fixative (kaltitanden) for 2 hrs, then rinsed in distilled H2O. Small speckles of the eggshells were embedded in Spurr medium and thin sections were made ultramicrotome.The crystalline part of eggshells are composed of many small plate-like calcite grains, whose plate normals are approximately parallel to the shell surface. The sizes of the grains are about 0.3×0.3×1 μm3 (Fig.l). These grains are not as closely packed as man-made polycrystalline metals and ceramics, and small gaps between adjacent grains are visible indicating the absence of conventional grain boundaries.

Crystallization of Calcium Carbonate Observed In-situ by Combined Small- and Wide-angle X-ray Scattering

2003 ◽  
Vol 107 (22) ◽  
pp. 5123-5125 ◽  
Author(s):  
Diego Pontoni ◽  
Joerg Bolze ◽  
Nico Dingenouts ◽  
Theyencheri Narayanan ◽  
Matthias Ballauff
Keyword(s):  
Calcium Carbonate ◽  
Wide Angle ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Gel-Like Calcium Carbonate Precursors Observed by in situ AFM

Langmuir ◽  
2016 ◽  
Vol 33 (1) ◽  
pp. 158-163 ◽  
Author(s):  
Stefan L. P. Wolf ◽  
Leonardo Caballero ◽  
Francisco Melo ◽  
Helmut Cölfen
Keyword(s):  
Calcium Carbonate

scholarly journals Microbial-induced calcium carbonate precipitation: an experimental toolbox for in situ and real time investigation of micro-scale pH evolution

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20485-20493
Author(s):  
Jennifer Zehner ◽  
Anja Røyne ◽  
Alexander Wentzel ◽  
Pawel Sikorski
Keyword(s):  
Calcium Carbonate ◽  
Real Time ◽  
Experimental Methods ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Micro Scale ◽  
Ph Changes ◽  
Global And Local ◽  
Local Ph

We present two novel experimental methods to follow global and local pH changes on a microscale in bio-cementation processes.

scholarly journals In-situ Preparation of Nano-calcium Carbonate/Cellulose Fiber Composite and Its Application in Fluff Pulp

2017 ◽  
Vol 12 (3) ◽  
pp. 155892501701200 ◽  
Author(s):  
Yongjian Xu ◽  
Chunmei Jiang ◽  
Chao Duan ◽  
Weipeng Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Calcium Carbonate ◽  
Adsorption Capacity ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Natural Polymers ◽  
Inorganic Particles ◽  
In Situ Preparation

Calcium carbonate/cellulose fiber composites combining natural polymers and inorganic particles are promising materials for preparing fluff pulp. In this study, calcium carbonate (CaCO3) particles were in-situ precipitated on cellulose fiber surfaces to decrease the level of hydrogen bonding. The results showed that nano CaCO3 particles precipitated and dispersed well on the fiber surface. The fluff pulp made from cellulose/CaCO3 modified fibers exhibited high effectiveness in the dry defibration process and good adsorption capacity due to the weak hydrogen bonding. The burst index of the handsheets decreased 31% (based on the ash content of 1.48 wt. %) without compromising the adsorption capacity of the fluff pulp.

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