Bioinspired synthesis of fluorescent calcium carbonate/carbon dot hybrid composites

2015 ◽  
Vol 44 (17) ◽  
pp. 8232-8237 ◽  
Author(s):  
Shanshan Guo ◽  
Miao Yang ◽  
Min Chen ◽  
Juan Zhang ◽  
Kang Liu ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Uv Irradiation ◽  
Carbon Dots ◽  
Hybrid Composites ◽  
Blue Fluorescence ◽  
Carbon Dot ◽  
Carbonate Carbon ◽  
Bioinspired Synthesis

Carbon dots (CDs) were applied as a template to direct the formation and assembly of calcite nanocrystals into hierarchical spheres and, simultaneously, as a phosphor to enable the as-prepared CaCO3 spheres to emit blue fluorescence under UV irradiation.

Comparison of Reinforcing Efficiency between Calcium Carbonate/Carbon Black and Calcium Carbonate/Silica Hybrid Filled Natural Rubber Composites

2018 ◽  
Vol 382 ◽  
pp. 94-98 ◽  
Author(s):  
Sarawut Prasertsri ◽  
Chaiwute Vudjung ◽  
Wunchai Inthisaeng ◽  
Sansanee Srichan ◽  
Kanchana Sapprasert ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Carbon Black ◽  
Natural Rubber ◽  
Hybrid System ◽  
Hybrid Composites ◽  
Strength Increase ◽  
Hybrid Filler ◽  
Carbonate Carbon ◽  
Cure Time

The present research aimed to develop natural rubber (NR) hybrid composites reinforced with calcium carbonate/carbon black (CC/CB) and calcium carbonate/silica (CC/SC). The influence of CC/CB and CC/SC with various filler ratios (120/0, 90/5, 60/10, 30/15 and 0/20) on cure characteristics and mechanical properties of the vulcanizates was investigated and their reinforcing efficiency was compared. It has been found that incorporation of CB in the hybrid filler decreases the scorch time and cure time but increases crosslink density, whereas the incorporation of silica showed cure retardation. As CB or SC content increases, stiffness, tensile strength and tear strength increase, while elongation at break and compression set decrease. Scanning electron microscopy studies also reveal poor filler dispersion and poor adhesion between filler particles and matrix in the vulcanizates with increasing in CC content in a weight filler ratio which causes inferior mechanical properties. Incorporation of CB or SC content enhanced the mechanical properties of the vulcanizates, where CC/CB hybrid system exhibited higher reinforcing efficiency compared with CC/SC hybrid system.

One-step synthesis of a carbon dot-based fluorescent probe for colorimetric and ratiometric sensing of tetracycline

2020 ◽  
Vol 12 (42) ◽  
pp. 5097-5102
Author(s):  
Jing Xue ◽  
Na-Na Li ◽  
Dong-Mei Zhang ◽  
Cai-Feng Bi ◽  
Cun-Gang Xu ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Fluorescent Probe ◽  
Butyric Acid ◽  
Carbon Dots ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Blue Fluorescence ◽  
Carbon Dot ◽  
Ratiometric Detection ◽  
One Step

Carbon dots (CDs) with blue fluorescence were synthesized by indole-3-butyric acid and l-tryptophan using a one-step hydrothermal method. The CDs were used as a fluorescent sensor with high selectivity for colorimetric and ratiometric detection of tetracycline (TC) in water.

scholarly journals Mechanical and rheological properties of partial replacement of carbon black by treated ultrafine calcium carbonate in natural rubber compounds

2021 ◽  
Author(s):  
Vitor Peixoto Klienchen de Maria ◽  
Fábio Paiva ◽  
Flávio Camargo Cabrera ◽  
Carlos Toshiyuki Hiranobe ◽  
Gabriel Deltrejo Ribeiro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Carbon Black ◽  
Natural Rubber ◽  
Hybrid Composites ◽  
Partial Substitution ◽  
Partial Replacement ◽  
Rubber Matrix ◽  
High Concentration ◽  
Carbonate Carbon

Abstract The present research aimed to develop natural rubber (NR) hybrid composites reinforced with treated ultrafine calcium carbonate/carbon black (CC/CB). The influence of CC/CB with various filler ratios (50/0, 40/10, 30/20, 20/30, 10/40 and 0/50) on mechanical properties and cure characteristics of the vulcanizates was investigated and their reinforcing efficiency was compared aiming to achieve the best ratio for CB partial substitution as compared to composites with CC and CB incorporated separately. The CC30/CB20 composites reached around to 17 MPa similar strength at break response compared to CC0/CB50 (16.83 MPa). Elongation at break increased 48% in relation to CC0/CB50. Hardness maintain similar values compare to high concentration of CB composites. Crosslink density results revealed similar chain number in rubber matrix representing better interaction between CC/CB. Scanning electron microscopy studies also reveal a good filler dispersion between filler particles and matrix. The results shown that the new material can be an alternative filler for partial substitution of CB conserving mechanical properties.

scholarly journals A novel carbon dot/polyacrylamide composite hydrogel film for reversible detection of the antibacterial drug ornidazole

RSC Advances ◽  
2021 ◽  
Vol 11 (37) ◽  
pp. 22993-23001
Author(s):  
Weizhen Wu ◽  
Xiaoyi Wu ◽  
Miao He ◽  
Xiaolin Yuan ◽  
Jiaping Lai ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Composite Hydrogel ◽  
Quantitative Detection ◽  
Antibacterial Drug ◽  
Blue Fluorescence ◽  
Carbon Dot ◽  
Real Samples ◽  
Hydrogel Film

A novel carbon dot/polyacrylamide composite hydrogel film with stable blue fluorescence performance was fabricated by merging a hydrogel film and carbon dots, which was used for highly selective and quantitative detection of ONZ in real samples.

Facilely prepared carbon dots and rare earth ion doped hybrid composites for ratio-metric pH sensing and white-light emission

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61468-61472 ◽  
Author(s):  
Tianxiang Zhang ◽  
Yue Zhai ◽  
He Wang ◽  
Jinyang Zhu ◽  
Lin Xu ◽  
...  
Keyword(s):  
Rare Earth ◽  
White Light ◽  
Carbon Dots ◽  
Light Emission ◽  
Hybrid Composites ◽  
Ph Sensing ◽  
Rare Earth Ion ◽  
One Pot ◽  
Carbon Dot ◽  
Hydrothermal Methods

A facile method was developed to synthesize fluorescent carbon-dot–Eu3+hybrid composites (CD–Eu–HCs) by one-pot hydrothermal methods.

A phenylenediamine-based carbon dot-modified silica stationary phase for hydrophilic interaction chromatography

The Analyst ◽  
2020 ◽  
Vol 145 (3) ◽  
pp. 1056-1061 ◽  
Author(s):  
Yali Yang ◽  
Haijuan Zhang ◽  
Jia Chen ◽  
Zhan Li ◽  
Liang Zhao ◽  
...  
Keyword(s):  
Stationary Phase ◽  
Carbon Dots ◽  
Porous Silica ◽  
Hydrophilic Interaction Chromatography ◽  
Silica Spheres ◽  
Hydrophilic Interaction ◽  
Modified Silica ◽  
Carbon Dot ◽  
New Stationary Phase ◽  
Enhanced Selectivity

Red emitting carbon dots derived from p-phenylenediamine were successfully grafted onto the surface of porous silica spheres which served as a new stationary phase for hydrophilic interaction chromatography with enhanced selectivity.

scholarly journals Synthesis and Optical Characterization of Carbon Dot from Peels of Dragon Fruit and Pear

2018 ◽  
Vol 4 (1) ◽  
pp. 19 ◽  
Author(s):  
Selvy Uftovia Hepriyadi ◽  
. Isnaeni
Keyword(s):  
Carbon Dots ◽  
Optical Characterization ◽  
Heating Time ◽  
Emission Wavelength ◽  
Time Resolved ◽  
Carbon Dot ◽  
Infrared Wavelength ◽  
Dragon Fruit ◽  
Time Changes

Fluorescence materials such as carbon dots are unique and non-toxic materials that can be produced using many methods. In this research, synthesis and optical characterization of carbon dots from the peels of dragon fruit and pear have been done. The synthesis uses bottom-up method using microwave with 20 minutes, 40 minutes, and 80 minutes of heating time. The result of optical characterizations showed that the samples that have been heat treated are carbon dots based of the absorbance in the range of 280-350 nm, and the intensity are decreased in the range of visible and infrared wavelength. There are emission and intensity changes by different heat treatments. From the samples of dragon fruit's peels, the emission wavelength tended to shift toward visible light at the wavelength of 551.51 nm, 507.98 nm and 487.28 nm with the excitation at the wavelength of 420 nm from pulsed pico-laser. While, the emission wavelength from the samples of pears peels were fluctuate in wavelength of 529.09 nm, 507.52 nm and 519.46 nm. Similarly, the time-resolved photoluminescence characterization test showed that there were time changes in each sample of carbon dot. The decay lifetime of carbon dots was fluctuated between 4.5 ns - 5.4 ns for dragon fruit’s peels and about 1.9 ns - 2.4 ns for pear's peels.

Near-Infrared Emitting Dual-Stimuli-Responsive Carbon Dots from Endogenous Bile Pigments

Nanoscale ◽  
2021 ◽  
Author(s):  
Parinaz Fathi ◽  
Parikshit Moitra ◽  
Madeleine M. McDonald ◽  
Mandy Brigitte Esch ◽  
Dipanjan Pan
Keyword(s):  
Surface Modification ◽  
Carbon Dots ◽  
Biomedical Applications ◽  
Near Infrared ◽  
Bile Pigments ◽  
Careful Selection ◽  
Stimuli Responsive ◽  
Carbon Dot ◽  
Surface Modification Techniques ◽  
Selection Of

Carbon dots are biocompatible nanoparticles suitable for a variety of biomedical applications. Careful selection of carbon dot precursors and surface modification techniques has allowed for the development of carbon dots...

scholarly journals EDTA-bonded multi-connected carbon-dots and their Eu3+ complex: preparation and optical properties

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10645-10650 ◽  
Author(s):  
Tianhao Ji ◽  
Peidong Fan ◽  
Xueli Li ◽  
Zhipeng Mei ◽  
Yongyun Mao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Carbon Dot ◽  
Complex Preparation

EDTA-bonded multi-connected carbon-dots (EDTA–C-dots) were prepared from carbon dot precursors and complexed with Eu3+ to give Eu3+-coordinated EDTA-bonded multi-connected carbon dots (Eu–EDTA–C-dots).

Water-sensitive phase-transition of a carbon dot–calcium carbonate composite for moisture detection in organic solvents

2019 ◽  
Vol 11 (20) ◽  
pp. 2634-2638 ◽  
Author(s):  
Haijun Yu ◽  
Haoxiang Li ◽  
Chao Chen ◽  
Shengmin Zhou ◽  
Ping Wang
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Calcium Carbonate ◽  
Water Content ◽  
Organic Solvents ◽  
Carbon Dot ◽  
Sensitive Phase ◽  
Moisture Detection

Sensitive and broad range water content detection in organic solvents based on phase transitions of a calcium carbonate nanocomposite is accomplished.

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