Various kinds of nearly spherical calcium carbonate (CaCO3) crystals with hierarchical and porous structures can be prepared using poly (ethylene glycol)-b-poly (aspartic acid) (PEG-b-pAsp) as a...

2021年11月1日 · The scanning electron microscope (SEM, Hitachi SU3500) with an accelerating voltage of 10 kV was used to characterize the morphology of CaCO3 powders. The morphology of obtaining CaCO 3 powder used to identify the shape of the particle at various reaction times indicated the presence of rhombohedral (calcite) and spherical (vaterite) shapes.

The SEM results consistently indicate two dominant mineral formations: CaCO 3 in the forms of calcite (rhombohedral morphology) and aragonite (needle-like morphology) 29 , as well as Mg OH ð Þ...

2019年11月7日 · Here we show that defects in the crystal structure of CaCO 3 may be detected by looking at the luminescence of crystals. Using cathodoluminescence by scanning electron microscopy (SEM-CL) and...

This research investigates the sedimentological characteristics of the Ennore creek, focusing on calcium carbonate (CaCO3), organic matter, and particle composition (sand, silt, and clay ...

SEM images of three calcium carbonate polymorphs: (a) aragonite; (b) vaterite; (c) calcite. By taking XPS wide scans and high resolution scans of Ca (2p), C (1s), O (1s) from three CaCO 3 polymorphs powders, we investigated the surface atomic ratios of Ca/C and O/Ca, and the chemical shifts of Ca (2p), C (1s)and O (1s) peaks.

2017年11月9日 · Herein, we apply a biomimetic mineralization method to grow prismatic-type CaCO 3 thin films, mimicking their biogenic counterparts found in mollusk shells with a three-step pathway: coating a...

This review aims to provide an in-depth explanation of how to characterize the structure of currently prepared calcium carbonate (CaCO 3) materials using a Scanning Electron Microscope (SEM) and a Transmission Electron Microscope (TEM). The study method was Systematic Literature Review (SLR).

rbonate (CaCO3) materials using a Scanning Electron Microscope (SEM) and a Transmission Electron Microscope (TEM). The study method was Systematic Literature Review (SLR). From the results, SEM and TEM electron microscopy methods are known to be very effective and very usef

摘要： 采用棕榈酸对纳米碳酸钙进行有机表面改性， 运用 SEM、TEM、XRD、FTIR 及 TG－DTG 对表面改性前后 的纳米碳酸钙进行表征， 并与微米碳酸钙的微晶结构及热分解特性进行比较． FTIR 分析结果确证 了棕榈酸与纳 米碳酸钙表面是以化学键合和物理吸附方式相结合， 粒子表面存在羧基等有机官能团的红外吸收特征．. 对比研 究发现， 碳酸钙微晶纳米化后， 其红外 V3 特征吸 收峰出现约 35 cm－1 的 蓝 移 现 象， 并 且 明 显 窄 化．. 初 步 解 释 了 纳 米碳酸 …