scholarly journals Orthogonal Functionalization of Nanodiamond Particles after Laser Modification and Treatment with Aromatic Amine Derivatives

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 908
Author(s):  
Justyna Fraczyk ◽  
Adam Rosowski ◽  
Beata Kolesinska ◽  
Anna Koperkiewcz ◽  
Anna Sobczyk-Guzenda ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Biological Activities ◽  
Laser System ◽  
Average Power ◽  
Average Laser Power ◽  
One Step ◽  
Ft Ir ◽  
Amine Groups ◽  
Ir And Raman

A laser system with a wavelength of 1064 nm was used to generate sp2 carbon on the surfaces of nanodiamond particles (NDPs). The modified by microplasma NDPs were analysed using FT-IR and Raman spectroscopy. Raman spectra confirmed that graphitization had occurred on the surfaces of the NDPs. The extent of graphitization depended on the average power used in the laser treatment process. FT-IR analysis revealed that the presence of C=C bonds in all spectra of the laser-modified powder. The characteristic peaks for olefinic bonds were much more intense than in the case of untreated powder and grew in intensity as the average laser power increased. The olefinized nanodiamond powder was further functionalized using aromatic amines via in situ generated diazonium salts. It was also found that isokinetic mixtures of structurally diverse aromatic amines containing different functional groups (acid, amine) could be used to functionalize the surfaces of the laser-modified nanoparticles leading to an amphiphilic carbon nanomaterial. This enables one-step orthogonal functionalization and opens the possibility of selectively incorporating molecules with diverse biological activities on the surfaces of NDPs. Modified NDPs with amphiphilic properties resulting from the presence carboxyl and amine groups were used to incorporate simultaneously folic acid (FA-CONH-(CH2)5-COOH) and 5(6)-carboxyfluorescein (FL-CONH-(CH2)2-NH2) derivatives on the surface of material under biocompatible procedures.

ONE-STEP SYNTHESIS OF BIOCOMPATIBLE CHITOSAN/NaGdF4:Eu3+ NANOCOMPOSITE WITH FLUORESCENT AND MAGNETIC PROPERTIES FOR BIOIMAGING

NANO ◽  
2014 ◽  
Vol 09 (01) ◽  
pp. 1450007 ◽  
Author(s):  
HUI LI ◽  
CHUANXI WANG ◽  
YINGNAN JIANG ◽  
ZHANCHEN CUI ◽  
QUAN LIN
Keyword(s):  
Hexagonal Phase ◽  
Mri Contrast Agent ◽  
Uniform Size ◽  
Mri Contrast ◽  
Potential Applications ◽  
One Step ◽  
Ft Ir ◽  
Good Biocompatibility ◽  
Amine Groups ◽  
Magnetic Resonance Imaging Mri

Lanthanide-doped luminescent nanoscale materials have great potential applications in biological researches. Herein, we reported a novel and mild method for one-step synthesis of chitosan/ NaGdF 4: Eu 3+ nanocomposites. The luminescent Eu 3+ ions and magnetic resonance imaging (MRI) contrast agent Gd 3+ ions were incorporated to these biocompatible nanocomposites. The resultant nanocomposites exhibited strong fluorescence and attractive magnetic features. The nanocomposites also have pure hexagonal phase with uniform size of about 65 nm. FT-IR spectra revealed that these nanocomposites were successfully coated by hydrophilic chitosan, whose amine groups conferred the nanocomposites excellent dispensability in aqueous solution. Besides, the MTT assay and laser confocal microscopy images have confirmed the good biocompatibility of the nanocomposites. These results indicated that the as-prepared nanocomposites could be used as an excellent targeted imaging agent in biological fields.

Efficient one-pot transformation of aminoarenes to haloarenes using halodimethylisulfonium halides generated in situ

2005 ◽  
Vol 83 (3) ◽  
pp. 213-219 ◽  
Author(s):  
Woonphil Baik ◽  
Wanqiang Luan ◽  
Hyun Joo Lee ◽  
Cheol Hun Yoon ◽  
Sangho Koo ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Environmental Pollutants ◽  
Aryl Halides ◽  
Nitrite Ion ◽  
One Pot ◽  
Aryl Chlorides ◽  
Step Procedure ◽  
One Step ◽  
Copper Halides

Halodimethylsulfonium halide 1, which is readily formed in situ from hydrohaloic acid and DMSO, is a good nucleophilic halide. This activated nucleophilic halide rapidly converts aryldiazonium salt prepared in situ by the same hydrohaloic acid and nitrite ion to aryl chlorides, bromides, or iodides in good yield. The combined action of nitrite ion and hydrohaloic acid in DMSO is required for the direct transformation of aromatic amines, which results in the production of aryl halides within 1 h. Substituted compounds with electron-donating or -withdrawing groups or sterically hindered aromatic amines are also smoothly transformed to the corresponding aromatic halides. The only observed by-product is the deaminated arene (usually <7%). The isolated aryldiazonium salts can also be converted to the corresponding aryl halides using 1. The present method offers a facile, one-step procedure for transforming aminoarenes to haloarenes and lacks the environmental pollutants that usually accompany the Sandmeyer reaction using copper halides. Key words: aminoarenes, haloarenes, halodimethylsulfonium halide, halogenation, amination.

A Facile One-Step Hydrothermal Synthesis of Graphene/CeO2 Nanocomposite and its Catalytic Properties

2013 ◽  
Vol 747 ◽  
pp. 242-245 ◽  
Author(s):  
Manish Srivastava ◽  
Ashok Kumar Das ◽  
Partha Khanra ◽  
Nam Hoon Kim ◽  
Joong Hee Lee
Keyword(s):  
Catalytic Activity ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
One Step ◽  
Ft Ir ◽  
Cetyltrimethyl Ammonium

Graphene/CeO2 nanocomposite has been successfully prepared by directly growing CeO2 nanoparticles on graphene sheets via in-situ reduction of graphene oxide containing the metal precursor. The presence of cetyltrimethyl ammonium bromide (CTAB) results the formation of CeO2 nanoparticles with a narrow size distribution. The structural, morphological, particles size and optical properties of the synthesized products were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FT-IR) and UVvis absorbance spectroscopy, respectively. The XRD pattern shows that graphene/CeO2 nanocomposite is highly crystalline in nature. Growth of CeO2 nanoparticles with size in range of 5-18 nm on the graphene sheet were observed by TEM measurement. Optical energy band gap was calculated to be ~3.30 eV corresponding to direct transition. The catalytic activity of the synthesized nanocomposite was investigated taking hydrazine hydrate as a model system. Significant enhancement in the peak current with respect to CeO2 was observed on graphene/CeO2 nanocomposite-based electrode demonstrating the higher catalytic activity of graphene/CeO2 nanocomposite-based electrode.

One-step hydrothermal method to synthesize Bi/Bi2MoO6 composite for photoelectric catalyst

2017 ◽  
Vol 10 (05) ◽  
pp. 1750053 ◽  
Author(s):  
Qian Zhang ◽  
Zhong-kun Zhao ◽  
Zhu-rui Shen ◽  
Qiang Wei
Keyword(s):  
Reduction Method ◽  
Photoelectric Property ◽  
Separation Efficiency ◽  
Charge Carriers ◽  
Test Results ◽  
Electrochemical Test ◽  
One Step ◽  
Ft Ir ◽  
Hydrothermal Reduction

Bi/Bi2MoO6 composite was prepared via a facile one-step hydrothermal reduction method and its photoelectric property was investigated. During the solvent-controlled reaction process, lysine performed as the reductant to in situ reduce Bi[Formula: see text] to metallic Bi. XRD, SEM, TEM, HRTEM, XPS and FT-IR were used to characterize the morphology, structure and chemical composition of the samples obtained. Bi/Bi2MoO6 composites have special structure of Bi2MoO6 nanosheets surrounding on the surface of Bi microspheres, besides, the Bi2MoO6 nanosheets have a thickness of 10–20[Formula: see text]nm. Furthermore, electrochemical test results show that the Bi/Bi2MoO6 composites can significantly enhance the separation efficiency of photogenerated charge carriers, the photocurrent of Bi/Bi2MoO6 composites prepared with 4[Formula: see text]mmol lysine is about 15 times to pure Bi2MoO6.

Preparation and Properties of Carbon Nanotube / Polyaniline Nanocomposites

2011 ◽  
Vol 391-392 ◽  
pp. 13-17
Author(s):  
Dong Yu Zhao ◽  
Zheng Jin ◽  
Xue Qin Yang ◽  
Xiao Ying Jia
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
In Situ Polymerization ◽  
Aniline Monomer ◽  
Multi Wall Carbon Nanotubes ◽  
Mixed Acid ◽  
Ft Ir ◽  
Ir And Raman ◽  
Hcl Solution

Aniline monomer coated on the nanotubes in HCl solution was used to prepare a composite of multi-wall carbon nanotube/polyaniline (MWCNT/PANI) by in-situ polymerization. Multi-wall carbon nanotubes were treated by the mixed acid (HNO3:H2SO4in a ratio of 1:3). The content of MWCNT in the samples was 0-20 wt%. The nanocomposites were characterized by Thermogravimetric analysis (TGA), Fourier transform-infrared spectroscopy (FT-IR), Raman spectroscopy and scanning electron microscopy. The mechanical properties of the MWCNT/PANI nanocomposites were also measured. The results showed that the MWCNT was well dispersed in water after purification. Both FT-IR and Raman spectra illustrated the presence of MWCNT in the composites; the interaction between PANI and MWCNT was proved. The Young΄s modulus was 618MPa with 20wt% loading. The effects of treatment of MWCNT on the mechanical properties of MWCNT/PANI nanocomposites are discussed.

Preparation and Characterization of Polyaniline/PMN Composite by In Situ Polymerization Method

2009 ◽  
Vol 66 ◽  
pp. 230-233 ◽  
Author(s):  
Tao Wei ◽  
Zhi Xiong Huang ◽  
Guo Rui Yang ◽  
Min Xian Shi
Keyword(s):  
Weight Loss ◽  
Steric Hindrance ◽  
In Situ Polymerization ◽  
Reaction Conditions ◽  
One Step ◽  
Ft Ir ◽  
Polymerization Method ◽  
Crystallization Degree

The PANI/PMN composite was prepared by one-step in-situ polymerization method and was characterized via FT-IR, XRD, SEM and TG. The results indicate that the best reaction conditions of in-situ polymerization are 0°C/24h.The PMN powder are entirely coated with PANI, when composite contains more than 60% PANI by volume. The steric hindrance effect of PMN powder decreases the crystallization degree of PANI which polymerizes on the surface of PMN powder in the process of in-situ polymerization. The main weight loss occurring between 300 and 480°C corresponds to the degradation of the PANI polymer chain.

FT-IR microspectroscopic analysis of diseased white matter brain tissues

1995 ◽  
Vol 53 ◽  
pp. 968-969
Author(s):  
Steven M. Le Vine ◽  
David L. Wetzel
Keyword(s):  
White Matter ◽  
Gray Matter ◽  
Twitcher Mouse ◽  
Grid Pattern ◽  
Marked Contrast ◽  
Spatially Resolved ◽  
Ft Ir ◽  
Ir Microspectroscopy ◽  
Chemical Evidence

In situ FT-IR microspectroscopy has allowed spatially resolved interrogation of different parts of brain tissue. In previous work the spectrrscopic features of normal barin tissue were characterized. The white matter, gray matter and basal ganglia were mapped from appropriate peak area measurements from spectra obtained in a grid pattern. Bands prevalent in white matter were mostly associated with the lipid. These included 2927 and 1469 cm-1 due to CH2 as well as carbonyl at 1740 cm-1. Also 1235 and 1085 cm-1 due to phospholipid and galactocerebroside, respectively (Figs 1and2). Localized chemical changes in the white matter as a result of white matter diseases have been studied. This involved the documentation of localized chemical evidence of demyelination in shiverer mice in which the spectra of white matter lacked the marked contrast between it and gray matter exhibited in the white matter of normal mice (Fig. 3).The twitcher mouse, a model of Krabbe’s desease, was also studied. The purpose in this case was to look for a localized build-up of psychosine in the white matter caused by deficiencies in the enzyme responsible for its breakdown under normal conditions.

Solid State Analysis and Theoretical Explorations on Polymorphic and Hydrate Forms of p-Hydroxybenzaldehyde Isonicotinichydrazone: Effect of Additives on Polymorphic Crystallization

2018 ◽  
Author(s):  
Lincy Tom ◽  
Victoria A. Smolenski ◽  
Jerry P. Jasinski ◽  
M.R. Prathapachandra Kurup
Keyword(s):  
Hirshfeld Surface ◽  
Framework Analysis ◽  
Reaction Conditions ◽  
Space Groups ◽  
Effect Of Additives ◽  
Ft Ir ◽  
Packing Arrangement ◽  
The Stability ◽  
Ir And Raman ◽  
Isonicotinic Hydrazide

The reaction of p-hydroxybenzaldehyde with an equimolar amount of isonicotinic hydrazide afforded two polymorphic and hydrate forms of p-hydroxybenzaldehyde isonicotinichydrazone (HBIH) by varying the experimental reaction conditions. The compounds are fully characterized by means of single crystal and powder diffraction methods, vibrational spectroscopy (FT-IR and Raman), thermal and elemental analysis. The compound crystallizes in three different forms in two different space groups, P21/c (form PA and PB) and Pbca (PC). The Hirshfeld surface analysis shows the differences in the relative contributions of intermolecular interactions to the total Hirshfeld surface area for the HBIH molecules. The calculated pairwise interaction energies (104-116 kJ/mol) can be related to the stability of the crystals. Energy framework analysis identifies the interaction hierarchy and their topology. The geometry and conformation of the three forms are essentially similar which differ only by packing arrangement.

Solid State Analysis and Theoretical Explorations on Polymorphic and Hydrate Forms of p-Hydroxybenzaldehyde Isonicotinichydrazone: Effect of Additives on Polymorphic Crystallization

2018 ◽  
Author(s):  
Lincy Tom ◽  
Victoria A. Smolenski ◽  
Jerry P. Jasinski ◽  
M.R. Prathapachandra Kurup
Keyword(s):  
Hirshfeld Surface ◽  
Framework Analysis ◽  
Reaction Conditions ◽  
Space Groups ◽  
Effect Of Additives ◽  
Ft Ir ◽  
Packing Arrangement ◽  
The Stability ◽  
Ir And Raman ◽  
Isonicotinic Hydrazide

The reaction of p-hydroxybenzaldehyde with an equimolar amount of isonicotinic hydrazide afforded two polymorphic and hydrate forms of p-hydroxybenzaldehyde isonicotinichydrazone (HBIH) by varying the experimental reaction conditions. The compounds are fully characterized by means of single crystal and powder diffraction methods, vibrational spectroscopy (FT-IR and Raman), thermal and elemental analysis. The compound crystallizes in three different forms in two different space groups, P21/c (form PA and PB) and Pbca (PC). The Hirshfeld surface analysis shows the differences in the relative contributions of intermolecular interactions to the total Hirshfeld surface area for the HBIH molecules. The calculated pairwise interaction energies (104-116 kJ/mol) can be related to the stability of the crystals. Energy framework analysis identifies the interaction hierarchy and their topology. The geometry and conformation of the three forms are essentially similar which differ only by packing arrangement.

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