Synthesis and Self-Assembling Properties of Peracetylated β-1-Triazolyl Alkyl D-Glucosides and D-Galactosides

Carbohydrate-based low-molecular-weight gelators (LMWGs) are useful classes of compounds due to their numerous applications. Among sugar-based LMWGs, certain peracetylated sugar beta-triazole derivatives were found to be effective organogelators and showed interesting self-assembling properties. To further understand the structural influence towards molecular assemblies and obtain new functional materials with interesting properties, we designed and synthesized a library of tetraacetyl beta-1-triazolyl alkyl-D-glucosides and D-galactosides, in which a two or three carbon spacer is inserted between the anomeric position and the triazole moiety. A series of 16 glucose derivatives and 14 galactose derivatives were synthesized and analyzed. The self-assembling properties of these new triazole containing glycoconjugates in different solvents were analyzed. Several glucose derivatives were found to be effective LMWGs, with compound 7a forming gels in a variety of organic solvents as well as in the presence of metal ions in aqueous solutions. The organogels formed by several compounds were characterized using optical microscopy, atomic force microscopy (AFM) and UV-vis spectroscopy, etc. The co-gels formed by compound 7a with the Fmoc derivative 7i showed interesting fluorescence enhancement upon gelation. Several gelators were also characterized using powder X-ray diffraction and FT-IR spectroscopy. The potential applications of these sugar-based gelators for drug delivery and dye removal were also studied.

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Optical, Structural and Electrical Properties of Electrochemical Synthesis of Thin Film of Polyaniline

Baghdad Science Journal ◽

10.21123/bsj.15.1.73-80 ◽

2018 ◽

Vol 15 (1) ◽

pp. 73-80 ◽

Cited By ~ 1

Author(s):

Baghdad Science Journal

Keyword(s):

X Ray Diffraction ◽

X Ray ◽

Force Microscopy ◽

Morphological Studies ◽

Atomic Force ◽

Vis Spectroscopy ◽

Structural And Electrical Properties ◽

A Cell ◽

Ft Ir ◽

Ir And Raman

Polyaniline membranes of aniline were produced using an electrochemical method in a cell consisting of two poles. The effect of the vaccination was observed on the color of membranes of polyaniline, where analysis as of blue to olive green paints. The sanction of PANI was done by FT-IR and Raman techniques. The crystallinity of the models was studied by X-ray diffraction technique. The different electronic transitions of the PANI were determined by UV-VIS spectroscopy. The electrical conductivity of the manufactured samples was measured by using the four-probe technique at room temperature. Morphological studies have been determined by Atomic force microscopy (AFM). The structural studies have been measured by (SEM).

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Nanocrystalline Solutions as Precursors to The Spray Deposition of Cdte Thin Films

MRS Proceedings ◽

10.1557/proc-382-461 ◽

1995 ◽

Vol 382 ◽

Cited By ~ 4

Author(s):

Martin Pehnt ◽

Douglas L. Schulz ◽

Calvin J. Curtis ◽

Helio R. Moutinho ◽

Amy Swartzlander ◽

...

Keyword(s):

Thin Films ◽

Atomic Force Microscopy ◽

Grain Size ◽

X Ray Diffraction ◽

X Ray ◽

Force Microscopy ◽

Cdte Nanoparticles ◽

Atomic Force ◽

Vis Spectroscopy ◽

Cdte Thin Films

ABSTRACTIn this article we report the first nanoparticle-derived route to smooth, dense, phase-pure CdTe thin films. Capped CdTe nanoparticles were prepared by injection of a mixture of Cd(CH3)2, (n-C8H17)3 PTe and (n-C8H17)3P into (n-C8H17)3PO at elevated temperatures. The resultant nanoparticles 32-45 Å in diameter were characterized by x-ray diffraction, UV-Vis spectroscopy, transmission electron microscopy, thermogravimetric analysis and energy dispersive x-ray spectroscopy. CdTe thin film deposition was accomplished by dissolving CdTe nanoparticles in butanol and then spraying the solution onto SnO2-coated glass substrates at variable susceptor temperatures. Smooth and dense CdTe thin films were obtained using growth temperatures approximately 200 °C less than conventional spray pyrolysis approaches. CdTe films were characterized by x-ray diffraction, UV-Vis spectroscopy, atomic force microscopy, and Auger electron spectroscopy. An increase in crystallinity and average grain size as determined by x-ray diffraction was noted as growth temperature was increased from 240 to 300 °C. This temperature dependence of film grain size was further confirmed by atomic force microscopy with no remnant nanocrystalline morphological features detected. UV-Vis characterization of the CdTe thin films revealed a gradual decrease of the band gap (i.e., elimination of nanocrystalline CdTe phase) as the growth temperature was increased with bulk CdTe optical properties observed for films grown at 300 °C.

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Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Gels ◽

10.3390/gels6040049 ◽

2020 ◽

Vol 6 (4) ◽

pp. 49

Author(s):

Bijender Kumar ◽

Ruchir Priyadarshi ◽

Sauraj ◽

Farha Deeba ◽

Anurag Kulshreshtha ◽

...

Keyword(s):

Carboxymethyl Cellulose ◽

Sodium Carboxymethyl Cellulose ◽

Sodium Acrylate ◽

X Ray Diffraction ◽

Hybrid Hydrogel ◽

X Ray ◽

Hydrogel Beads ◽

Force Microscopy ◽

Atomic Force ◽

Potential Applications

Novel sodium carboxymethyl cellulose-g-poly (sodium acrylate)/Ferric chloride (CMC-g-PNaA/FeCl3) nanoporous hydrogel beads were prepared based on the ionic cross-linking between CMC-g-PNaA and FeCl3. The structure of CMC and CMC-g-PNaA were elucidated by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy, and the elemental composition was analyzed by energy dispersive X-ray analysis (EDX). The physicochemical properties of the CMC-g-PNaA/FeCl3 hydrogel beads were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetric analysis (TGA). The swelling percentage of hydrogel beads was studied at different time periods. The obtained CMC-g-PNaA/FeCl3 hydrogel beads exhibited a higher nanoporous morphology than those of CMC-g-PNaA and CMC beads. Furthermore, an AFM image of the CMC-g-PNaA/FeCl3 beads shows granule type topology. Compared to the CMC-g-PNaA (189 °C), CMC-g-PNaA/FeCl3 hydrogel beads exhibited improvement in thermal stability (199 °C). Furthermore, CMC-g-PNaA/FeCl3 hydrogel beads depicted a higher swelling percentage capacity of around 1452%, as compared to CMC-g-PNaA (1096%). Moreover, this strategy with preliminary results could be useful for the development of polysaccharide-based hybrid hydrogel beads for various potential applications.

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Facile synthesis of TiO2 film on glass for the photocatalytic removal of rhodamine B and tetracycline hydrochloride

Materials Express ◽

10.1166/mex.2019.1522 ◽

2019 ◽

Vol 9 (5) ◽

pp. 437-443 ◽

Cited By ~ 3

Author(s):

Jiaxin Li ◽

Zhi Chen ◽

Jianfei Fang ◽

Qian Yang ◽

Xiuru Yang ◽

...

Keyword(s):

Thin Film ◽

Organic Pollutants ◽

Reaction System ◽

Practical Application ◽

X Ray Diffraction ◽

Force Microscopy ◽

Atomic Force ◽

Photocatalytic Removal ◽

Coating Method ◽

Potential Applications

Photocatalysis is one of the efficient approaches for pollution control in water. However, the traditional photocatalysts used for the removal of organic pollutants are in powder form, which makes it difficult to recover them from the suspended reaction system. On the contrary, thin film photocatalyst is easy to be retrieved and possesses unique feature for practical application. In present work, stable TiO2 sol suspension was prepared and amorphous TiO2 thin film was then immobilized upon glass substrate through facile spin coating method. The thickness of film could be simply controlled by changing the number of coatings, and anatase TiO2 film could be formed after calcination. The prepared thin films were characterized with X-ray diffraction (XRD), ultravioletvisible spectrophotometry (UV-vis), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The photodegradations of organic pollutants including colored dye and colorless antibiotic were tested and found to be thickness-dependent. Additionally, the prepared film photocatalst has good stability and may have potential applications in wastewater treatment.

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Laser Ablation Ceramic Target for 8YSZ High-k Dielectric Electrolyte thin Films Precessed by PLD on Si(100) and Pt/Si(111)

Revista de Chimie ◽

10.37358/rc.20.7.8245 ◽

2020 ◽

Vol 71 (7) ◽

pp. 272-277

Author(s):

Rovena Veronica Pascu

Keyword(s):

Thin Films ◽

X Ray Diffraction ◽

Stabilized Zirconia ◽

X Ray ◽

Force Microscopy ◽

Atomic Force ◽

High K ◽

Potential Applications ◽

Electrochemical Devices ◽

High K Dielectric

The cubic structure 8YSZ (8%Yttria-Stabilized Zirconia) thin films deposited by PLD(Pulsed Laser Deposition) on substrates Si (100) and Pt/Si (111) by identical control parameters have potential applications as electrolytes for planar micro electrochemical devices like Lambda oxygen sensors and IT-�SOFC. It appearance differences in polycrystalline structural and optical characterization by XRD (X-ray Diffraction), SEM (Scanning Electron Microscope), AFM (Atomic Force Microscopy) and V- VASE (Variable Angle Spectroscopic Ellipsometry. The differences are relating on crystalline dimensions, lattice parameters; surface roughness measured by V- VASE and AFM are presented synthetic to evidence the differences generated by substrates.

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Comparison between the optical and surface properties of TiO2 and Ag/TiO2 thin films prepared by sol-gel process

MRS Proceedings ◽

10.1557/opl.2011.758 ◽

2011 ◽

Vol 1352 ◽

Author(s):

Marcelo M. Viana ◽

Nelcy D. S. Mohallem

Keyword(s):

Thin Films ◽

Sol Gel ◽

Refraction Index ◽

Titanium Isopropoxide ◽

X Ray Diffraction ◽

Tio2 Thin Films ◽

Force Microscopy ◽

Atomic Force ◽

Vis Spectroscopy ◽

Sol Gel Process

ABSTRACTColloidal precursor solutions, obtained from a mixture of titanium isopropoxide, isopropyl alcohol and silver nitrate, were used to fabricate amorphous TiO2 and Ag/TiO2 thin films by sol-gel process. The films were deposited on borosilicate substrates, which were heated at 400 °C for 30 minutes and cooled rapidly to the formation of amorphous coatings. The films were investigated by X-ray diffraction, scanning electron microscopy, atomic force microscopy and UV-vis spectroscopy. The thickness, roughness, refraction index, and particle size of the TiO2 and Ag/TiO2 films were determined and compared. Finally, hydrophobic-hydrophilic property was evaluated to the thin films produced.

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Enhancing Removal of Cr(VI), Pb2+, and Cu2+ from Aqueous Solutions Using Amino-Functionalized Cellulose Nanocrystal

Molecules ◽

10.3390/molecules26237315 ◽

2021 ◽

Vol 26 (23) ◽

pp. 7315

Author(s):

Qinghua Xu ◽

Xiaodi Huang ◽

Lukuan Guo ◽

Yu Wang ◽

Liqiang Jin

Keyword(s):

Aqueous Solutions ◽

Cellulose Nanocrystal ◽

X Ray Diffraction ◽

Potential Measurement ◽

Force Microscopy ◽

Atomic Force ◽

Adsorption Capacities ◽

Green Route ◽

Pseudo Second Order ◽

Ft Ir

In this work, the amino-functionalized cellulose nanocrystal (ACNC) was prepared using a green route and applied as a biosorbent for adsorption of Cr(VI), Pb2+, and Cu2+ from aqueous solutions. CNC was firstly oxidized by sodium periodate to yield the dialdehyde nanocellulose (DACNC). Then, DACNC reacted with diethylenetriamine (DETA) to obtain amino-functionalized nanocellulose (ACNC) through a Schiff base reaction. The properties of DACNC and ACNC were characterized by using elemental analysis, Fourier transform infrared spectroscopy (FT-IR), Kaiser test, atomic force microscopy (AFM), X-ray diffraction (XRD), and zeta potential measurement. The presence of free amino groups was evidenced by the FT-IR results and Kaiser test. ACNCs exhibited an amphoteric nature with isoelectric points between pH 8 and 9. After the chemical modification, the cellulose I polymorph of nanocellulose remained, while the crystallinity decreased. The adsorption behavior of ACNC was investigated for the removal of Cr(VI), Pb2+, and Cu2+ in aqueous solutions. The maximum adsorption capacities were obtained at pH 2 for Cr(VI) and pH 6 for Cu2+ and Pb2+, respectively. The adsorption all followed pseudo second-order kinetics and Sips adsorption isotherms. The estimated adsorption capacities for Cr(VI), Pb2+, and Cu2+ were 70.503, 54.115, and 49.600 mg/g, respectively.

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Graphene Synthesis by Ultrasound Energy Assisted Exfoliation of Graphite in Various Solvents

10.3762/bxiv.2020.114.v1 ◽

2020 ◽

Author(s):

Betül Gürünlü ◽

Çiğdem Taşdelen-Yücedağ ◽

Mahmut Bayramoğlu

Keyword(s):

Low Cost ◽

Dimethyl Formamide ◽

X Ray Diffraction ◽

Force Microscopy ◽

Graphene Synthesis ◽

Atomic Force ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Ultrasound Energy ◽

Size And Morphology

Liquid Phase Exfoliation (LPE) method has been gaining increasing interest by academic and industrial researchers due to its simplicity, low-cost, and scalability. High intensity ultrasound energy was exploited to transform graphite to graphene in the solvents of dimethyl sulfoxide (DMSO), N,N-dimethyl formamide (DMF), and perchloric acid (PA) without any surfactants or ionic liquids. The crystal structure, number of layers, particle size, and morphology of the synthesized graphene samples were characterized by X-ray Diffraction (XRD), Atomic Force Microscopy (AFM), Ultraviolet visible (UV–vis) spectroscopy, Dynamic Light Scattering (DLS), and Transmission Electron Microscopy (TEM). XRD and AFM analyses indicated that G-DMSO and G-DMF have few layers and G-PA has multilayers. The layer numbers of G-DMSO, G-DMF, and G-PA were determined as 9, 10, and 21, respectively. By DLS analysis, the particle sizes of graphene samples were estimated in a few micrometers. TEM analyses showed that G-DMSO and G-DMF possess sheet-like fewer layers and also, G-PA has wrinkled and unordered multilayers.

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Compositionally Modified Hydroxyapatite Nanocrystals for Polymer/Ceramic Scaffold Applications

MRS Proceedings ◽

10.1557/proc-0897-j03-18 ◽

2005 ◽

Vol 897 ◽

Author(s):

Andrei Stanishevsky ◽

Peserai Chinoda ◽

Shafiul Chowdhury ◽

Vinoy Thomas ◽

Aaron Catledge ◽

...

Keyword(s):

Polymeric Materials ◽

Chemical Precipitation ◽

X Ray Diffraction ◽

Tissue Engineering Scaffolds ◽

Force Microscopy ◽

Ceramic Scaffold ◽

Atomic Force ◽

Ft Ir ◽

Hydroxyapatite Nanocrystals ◽

Bioresorbable Implants

AbstractThe polymer/bioceramic composite materials attract much attention for the development of bioresorbable implants and tissue engineering scaffolds. Hydroxyapatite (HA) is the most commonly used bioceramic material due to its similarity to the major mineral component of the hard tissue. We synthesized carbonated and Mg-substituted HA nanocrystals with various concentrations of CO32− and Mg2+ ions by chemical precipitation in the range of the process temperatures from 25 °C to 100 °C.The HA nanocrystals were mixed with several polymeric materials (PCL, PLA, PVA, collagen) to fabricate bulk and nanofiber polymer/HA nanoparticle composites with the HA loading up to 80 % by weight. The HA nanocrystals and polymer/HA composites were characterized by X-ray diffraction, FT-IR spectroscopy, scanning electron and atomic force microscopy. Mechanical properties of the composites were investigated using nanoindentation technique.

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Dispersion of Boron Nitride Nanotubes by Pluronic Triblock Copolymer in Aqueous Solution

Polymers ◽

10.3390/polym11040582 ◽

2019 ◽

Vol 11 (4) ◽

pp. 582 ◽

Cited By ~ 1

Author(s):

Sang-Woo Jeon ◽

Shin-Hyun Kang ◽

Jung Choi ◽

Tae-Hwan Kim

Keyword(s):

Aqueous Solution ◽

Boron Nitride ◽

Piezoelectric Materials ◽

Hydrophobic Surface ◽

Boron Nitride Nanotubes ◽

Van Der Waals Interactions ◽

Force Microscopy ◽

Atomic Force ◽

Vis Spectroscopy ◽

Potential Applications

Boron nitride nanotubes (BNNTs) have been of interest for their excellent thermal, electrical, and mechanical properties, and they have a broad spectrum of potential applications, such as in piezoelectric materials, reinforcement of materials, and electrothermal insulation materials. For practical use of BNNTs, it is desirable to disperse them in aqueous solution, which improves convenience of handling. However, it is still difficult to make a homogenous and stable BNNT dispersion in aqueous solution, due to their strong van der Waals interactions and hydrophobic surface. To solve these problems, we used Pluronic P85 and F127, which have both hydrophilic groups and hydrophobic groups. Here, we report the wrapped structure of a Pluronic polymer-BNNT dispersion by using small-angle neutron scattering, UV–Vis spectroscopy, thermogravimetric analysis, and atomic force microscopy.

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