CARBON NANOTUBE-GRAFT-POLY(CITRIC ACID) NANOCOMPOSITES

NANO ◽  
2008 ◽  
Vol 03 (01) ◽  
pp. 37-44 ◽  
Author(s):  
MOHSEN ADELI ◽  
ALI BAHARI ◽  
HODA HEKMATARA
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Citric Acid ◽  
Room Temperature ◽  
Water Solution ◽  
Degree Of Polymerization ◽  
Multi Wall Carbon Nanotubes ◽  
Hyperbranched Poly ◽  
Acid Ratio ◽  
Biodegradable Nanocomposites

Novel biodegradable nanocomposites containing multi wall carbon nanotubes (MWCNT) and poly(citric acid) (PCA) were successfully synthesized. For preparation of nanocomposites, MWCNT was opened using a mixture of sulfuric and nitric acid and its derivative containing – COOH and – OH functional groups was obtained. Polycondensation of monohydrate citric acid in the presence of functionalized MWCNT in the melting state was lead to nanotube-graft-poly(citric acid) (CNT-g-PCA) nanocomposites. The degree of polymerization of grafted hyperbranched poly(citric acid) onto the CNTs was controlled using CNT/citric acid ratio. The CNT-g-PCA were soluble in water freely and stirring their water solution and silver nitrate at room temperature lead to the CNT-g-PCA containing encapsulated silver nanoparticles in their polymeric shell. The structure of nanocomposites was characterized by TEM, DLS and spectroscopy methods.

CARBON NANOTUBE-GRAFT-POLY (CITRIC ACID) CONTAINING SILVER AND PALLADIUM NANOPARTICLES

NANO ◽  
2009 ◽  
Vol 04 (04) ◽  
pp. 217-223 ◽  
Author(s):  
ALI BAHARI ◽  
H. HEKMATARA ◽  
R. SEPAHVAND ◽  
MOHSEN ADELI
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Silver Nanoparticles ◽  
Citric Acid ◽  
Palladium Nanoparticles ◽  
Metal Salts ◽  
Acid Mixture ◽  
Palladium Chloride ◽  
Simple Method ◽  
Multi Wall Carbon Nanotubes

A simple method has been developed for decorating multi wall carbon nanotubes (MWCNTs) with palladium and silver nanoparticles. In this method, MWCNT was opened and functionalized using nitric and sulfuric acid mixture. Then citric acid was polymerized in the presence of functionalized MWCNT and MWCNT-graft-poly (citric acid) (MWCNT-g-PCA) was obtained. The mixing of MWCNT-g-PCA with metal salts, such as palladium chloride and silver nitrate, leads to encapsulation of metal nanoparticles in the polymeric shell ( MWCNT/Pd, AgNPs ). The structure of MWCNT/Pd and AgNPs were characterized by usual spectroscopy and microscopy methods. The influence of nanoparticles on the electrical conductivity of MWCNT was also investigated.

The synthesis of functionalized carbon nanotubes by hyperbranched poly(amine-ester) with liquid-like behavior at room temperature

Polymer ◽  
2009 ◽  
Vol 50 (13) ◽  
pp. 2953-2957 ◽  
Author(s):  
Jiaoxia Zhang ◽  
Yaping Zheng ◽  
Peiying Yu ◽  
Su Mo ◽  
Rumin Wang
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Functionalized Carbon Nanotubes ◽  
Hyperbranched Poly

CARBON NANOTUBE-GRAFT-BLOCK COPOLYMERS CONTAINING SILVER NANOPARTICLES

2009 ◽  
Vol 08 (06) ◽  
pp. 533-541 ◽  
Author(s):  
MOHSEN ADELI ◽  
REZA SEPAHVAND ◽  
ALI BAHARI ◽  
BANDAR ASTINCHAP
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Carbon Nanotube ◽  
Block Copolymers ◽  
Functional Groups ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Multi Wall Carbon Nanotubes ◽  
Grafted Copolymer ◽  
Monomer Ratio

Polycaprolactone-polylactide block copolymers (PCL-block-PLA) were grafted onto filled multi-wall carbon nanotubes (MWCNT) successfully. In this synthesis, MWCNTs were opened and functionalized, and then they were filled by silver nanoparticles. The filled MWCNT were used as macroinitiator for ring opening polymerization of ε-caprolactone and L-lactide. Then the end hydroxyl functional groups of MWCNT-graft-PCL or MWCNT-graft-PLA were used as initiator for ring opening polymerization of lactide and ε-caprolactone and MWCNT-graft-PCL-block-PLA or MWCNT-graft-PLA-block-PCL were obtained, respectively. Length of grafted copolymer chains onto the MWCNT was controlled using CNT/monomer ratio. Nanocomposites' properties depend on the length of polymer blocks strongly. Structure of nanocomposites was evaluated by TEM and spectroscopy methods.

Morphometric Parameters and Biochemical Status of Oilseed Rape Exposed to Fine-Dispersed Metallurgical Sludge, PHMB-Stabilized Silver Nanoparticles and Multi-Wall Carbon Nanotubes

2014 ◽  
Vol 880 ◽  
pp. 212-218 ◽  
Author(s):  
Alexander A. Gusev ◽  
Olga A. Akimova ◽  
Olga V. Zakharova ◽  
Anna Yu. Godymchuk ◽  
Yury A. Krutyakov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Oilseed Rape ◽  
Suppressive Effect ◽  
Biological Properties ◽  
Morphometric Parameters ◽  
Colloidal Silver ◽  
Germination Capacity ◽  
Multi Wall Carbon Nanotubes ◽  
Biochemical Status

Thepaper Presents Biological Properties of Threefine-Dispersed Materials, Namely Metallurgical Sludge, Colloidal Silver Andmulti-Wall Carbon Nanotubes (MWCNT) Exposing Oilseed Rape Plants. the Stimulationof Plant’s Growth by Silver Nanoparticles and the Intensification of Plantpigments Synthesis by MWCNT have been Experimentally Demonstrated. A Small Decreasein Energy and Germination Capacity were Noticed Whereby Colloidal Silver Hadthe Lowest Suppressive Effect, MWCN Tubes had the Highest Effect, and Sludge Wasfound in between Two above-Mentioned Materials. According to the Research, the Usageof Sludge is the most Effective at the Concentration of 10 and 100 g/l,colloidal Silver – 10 g/l and 300 g/l, MWCNT – 0,001 g/l and 1 g/l.

Eco-Friendly Synthesis and Applicability to Silver Ink of Silver Nanoparticles Prepared via Stepwise-Modified Tollens Method

2021 ◽  
Vol 21 (4) ◽  
pp. 2568-2575
Author(s):  
Nguyen Cong Tu ◽  
Ho Minh Sang ◽  
Luu Thi Lan Anh ◽  
Nguyen Huu Lam
Keyword(s):  
Silver Nanoparticles ◽  
Acetic Acid ◽  
Citric Acid ◽  
Acid Solution ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Silver Ink ◽  
Stepwise Method ◽  
Mean Size ◽  
The Mean

Silver nanoparticles were eco-friendly synthesized at room temperature via a Tollens process modified with the stepwise method using eco-friendly precursors (citric acid and acetic acid). The field emission scanning electron spectroscopy was used to study the morphology of silver nanoparticles. The mean size of silver nanoparticles and the components of products were theoretically determined using UV-Vis and X-ray Diffraction spectra. The mole ratio between the silver ion, citric acid and the buffer acid solution (acetic acid) strongly influences the mean size and the composition of the product. The appearance of acetic acid in the buffer acid solution helped increase the efficiency of silver nanoparticles preparation. With the mole ratio n[Ag+]:ncitric:nacetic = 1.0:2.5:2.5, the highest preparation efficiency was obtained, the silver nanoparticles had an average dimension of ˜11 nm and narrow size distribution. The silver nanoparticles were dispersed into different solvents to examine their applicability to silver ink. The silver ink using propylene glycol solvent showed good applicability to silver ink which could work at room temperature.

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