scholarly journals Preparation and Characterization of Pt-Doped Bi2MoO6 Nanocomposites and Its High PDT Efficiency on HL60 Cells

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Mucang Xiao ◽  
Miaomiao Li ◽  
Yongkun Lun ◽  
Qilin Pan ◽  
Baoquan Ai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Reduction Method ◽  
Spectral Response ◽  
Chemical Properties ◽  
Atomic Ratio ◽  
Hl60 Cells ◽  
Response Range ◽  
Vis Spectroscopy

In this study, Pt-doped Bi2MoO6 nanocomposites were prepared by solvothermal and in situ reduction method. We used XRD, UV-Vis spectroscopy, TEM, EDS, and XPS to characterize its chemical properties. Results showed that the Pt-doped Bi2MoO6 nanocomposites had advantages of small size, good dispersion, and wide spectral response range. Then, we tested its biological toxicity and PDT efficiency on HL60 cells. Both pure Bi2MoO6 and Pt-doped Bi2MoO6 nanocomposites showed great biocompatibility after coincubated with leukemia cells for 12 h in the dark. As to PDT efficiency, Pt-doped Bi2MoO6 had a better-inactivated effect than pure Bi2MoO6. Furthermore, the PDT efficiency went up when atomic ratios and concentration increased. While the atomic ratio was 5% and the concentration was 1000 μg/mL, it reached the highest value at 85.2%. At last, we briefly analyzed the photocatalysis mechanism, which demonstrated that it was a potential photosensitizer with high efficiency for treating leukemia.

Study on the Synthesis and Characterization of PANi/Nano-CeO2 Composites

2007 ◽  
Vol 124-126 ◽  
pp. 287-290 ◽  
Author(s):  
Fei Liu ◽  
Yong Jun He ◽  
Jeung Soo Huh
Keyword(s):  
In Situ Polymerization ◽  
Solid Phase ◽  
Polymerization Reaction ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Average Size

The nano-CeO2 was synthesized by two-step solid-phase reaction. The image of TEM showed that nano-CeO2 with an average size of about 70 nm. The series of polyaniline/nano-CeO2 composites with different PANi: CeO2 ratios were prepared by in-situ polymerization in the presence of hydrochloric acid (HCl) as dopant by adding nano-CeO2 into the polymerization reaction mixture of aniline. The composites obtained were characterized by FT-IR and UV-vis spectroscopy analysis. The FT-IR spectra of nanocomposites indicate different blue-shifts, attributed to C–N stretching mode for benzenoid unit. The UV-vis spectra of nanocomposites display einstein-shifts compared with PANi at 620nm. The conductivity properties of the composites are also changed compare to the pure PANi. These results suggest that the interactions between the polymer matrix and nanoparticles take place in polyaniline/nano- CeO2 composites.

The Application of 57FE Mössbauer Spectroscopy to the Characterization of Nuclear Waste Forms

1981 ◽  
Vol 6 ◽  
Author(s):  
Paul G. Huray ◽  
M. T. Spaar ◽  
S. E. Nave ◽  
J. M. Legan ◽  
L. A. Boatner ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Chemical Properties ◽  
Electronic Charge ◽  
Chemical Information ◽  
Waste Forms ◽  
Charge States ◽  
Physical And Chemical ◽  
Nuclear Waste Forms

The electronic charge states and site symmetries of the radioactive ions incorporated in nuclear waste forms are of considerable importance in determining the physical and chemical properties of these materials. An in situ characterization of these ions is, unfortunately, often difficult – especially when a mixture of charge states and local crystal symmetries exist. The application of Mbssbauer spectroscopy represents a powerful technique for obtaining solid state chemical information.

scholarly journals Determining the Location of Co2+ in Zeolites by UV-Vis Diffuse Reflection Spectroscopy: A Critical View

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 123 ◽  
Author(s):  
Andrea Bellmann ◽  
Christine Rautenberg ◽  
Ursula Bentrup ◽  
Angelika Brückner
Keyword(s):  
Diffuse Reflection ◽  
Co Adsorption ◽  
In Situ Ftir ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy ◽  
Oxide Supports ◽  
In Situ Ftir Spectroscopy ◽  
Vis Spectroscopy

UV–Vis spectroscopy as well as in situ FTIR spectroscopy of pyridine and CO adsorption were applied to determine the nature of Co species in microporous, mesoporous, and mixed oxide materials like Co–ZSM-5, Co/Na–ZSM-5, Co/Al–SBA-15, and Co/Al2O3–SiO2. Because all sample types show comparable UV–Vis spectra with a characteristic band triplet, the former described UV–Vis band deconvolution method for determination and quantification of individual cationic sites in the zeolite appears doubtful. This is also confirmed by results of pyridine and CO adsorption revealing that all Co–zeolite samples contain two types of Co2+ species located at exchange positions as well as in oxide-like clusters independent of the Co content, while in Co/Al–SBA-15 and Co/Al2O3–SiO2 only Co2+ species in oxide-like clusters occur. Consequently, the measured UV–Vis spectra represent not exclusively isolated Co2+ species, and the characteristic triplet band is not only related to γ-, β-, and α-type Co2+ sites in the zeolite but also to those dispersed on the surface of different oxide supports. The study demonstrates that for proper characterization of the formed Co species, the use of complementary methods is required.

Preparation and Characterization of Nano-Films Materials

2011 ◽  
Vol 492 ◽  
pp. 160-163
Author(s):  
Cai Xia Li ◽  
Qing Lv ◽  
Jie Song ◽  
Dan Yu Jiang ◽  
Qiang Li
Keyword(s):  
Self Assembly ◽  
Chemical Properties ◽  
Layered Compounds ◽  
Insertion Reaction ◽  
Layer By Layer ◽  
Vis Spectroscopy ◽  
Assembly Technique ◽  
Assembly Technology ◽  
Physical And Chemical

Nano-sheets are two-dimensional sheet materials exfoliated from the inorganic layered compounds by various physical and chemical methods. Their unique characteristics insertion reaction and excellent physical and chemical properties have attracted more and more researchers' widespread interests. Selecting quartz glass as the substrate, using layer by layer self-assembly technology, different nano-films materials are prepared. UV/Vis spectroscopy confirmed nano-films materials have been successfully assembled using LBL self-assembly technique. Raman spectrum are mainly used to analyze and characterize the structure of nano-films materials.

scholarly journals In Situ Compensation Method for Precise Integral SQUID Magnetometry of Miniscule Biological, Chemical, and Pow-der Specimens Requiring the Use of Capsules

2022 ◽  
Author(s):  
Katarzyna Gas ◽  
Maciej Sawicki
Keyword(s):  
Reduction Method ◽  
Experimental Methodology ◽  
Sample Holder ◽  
Squid Magnetometry ◽  
In Situ Reduction ◽  
Magnetic Characterization ◽  
Data Reduction Method ◽  
Alignment Errors

Steadily growing interest in magnetic characterization of organic compounds for therapeutic purposes or of other irregularly shaped specimens calls for refinements of experimental methodology to satisfy experimental challenges. Encapsulation in capsules remains the method of choice, but its applicability in precise magnetometry is limited. This is particularly true for minute specimens in the single milligram range as they are outweighed by the capsules and are subject to large alignment errors. We present here a completely new experimental methodology that permits 30-fold in situ reduction of the signal of capsules by substantially restoring the symmetry of the sample holder that is otherwise broken by the presence of the capsule. In practical terms it means that the standard 30 mg capsule is seen by the magnetometer as approximately a 1 mg object, effectively opening the window for precise magnetometry of single milligram specimens. The method is shown to work down to 1.8 K and in the whole range of the magnetic fields. The method is demonstrated and validated using the reciprocal space option of MPMS-SQUID magnetometers; however, it can be easily incorporated in any magnetometer that can accommodate straw sample holders (i.e., the VSM-SQUID). Importantly, the improved sensitivity is accomplished relying only on the standard accessories and data reduction method provided by the SQUID manufacturer, eliminating the need for elaborate raw data manipulations.

Synthesis and Characterization of Poly(2-acrylamido-2-methyl propyl sulfonic acid-co-2-hydroxyethyl methclate)/ Silver Nanoparticle Composite Hydrogel as Catalysts for the Reduction of 4-Nitrophenol

2014 ◽  
Vol 809-810 ◽  
pp. 59-66
Author(s):  
Yun Long Li ◽  
Bin Huang Liu ◽  
Song Bai Lin
Keyword(s):  
Sulfonic Acid ◽  
Reduction Method ◽  
Catalytic Properties ◽  
Reduction Reaction ◽  
Composite Hydrogel ◽  
Synthesis And Characterization ◽  
In Situ Reduction ◽  
End Group

A novel kind of AgNPs catalyst was synthesized by in-situ reduction method using poly(2-acrylamido-2-methyl propyl sulfonic acid-co-2-hydroxyethyl methclate) [short as P(AMPS-co-HEMA)] hydrogel as matrices and AgNO3as a metal precursor. The structure of the composite hydrogel was characterized by Scan Electrical Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The results showed that AgNPs were binded with end group and most of the particles were isolated and uniformly distributed on the P(AMPS-co-HEMA). The catalytic properties in the reduction reaction of 4-nitrophenol(shorted as 4-NP) to 4-aminophenol(shorted as 4-AP) were studied in detail, and the result showed that conversion rate and conversion efficiency attained 97.56% and 0.9671 mmol/g·min when the amount of AgNPs was 9mg, [NaBH4] was 2.0×10−1mol/L, [4-NP] was 2.0×10−2mol/L and the total volume of solution was 50 mL, respectively.

Dendrimer-Metal Nanocomposites

1999 ◽  
Vol 576 ◽  
Author(s):  
L. Balogh ◽  
K. S. Laverdure ◽  
S. P. Gido ◽  
A. G. Mott ◽  
M. J. Miller ◽  
...  
Keyword(s):  
Inorganic Compounds ◽  
Chemical Properties ◽  
Pamam Dendrimer ◽  
Surface Functionality ◽  
Surface Modified ◽  
Metal Nanocomposites ◽  
Physical And Chemical ◽  
Nanocomposite Structures

ABSTRACTDendrimer metal nanocomposites are novel hybride materials that display unique physical and chemical properties as a consequence of the atomic/molecular level dispersion of inorganic and organic molecules. In their synthesis, dendrimers are used as templates to pre-organize metal ions followed by an in-situ reduction, which will immobilize and stabilize atomic domains of the reaction product(s). Size, shape, size distribution and surface functionality of these nanocomposites are determined and controlled by the dendritic macromolecules and may also be influenced by the encapsulated compounds. Solubility of these molecular nanocomposites is controlled by the polymer. Thus, it is possible to solubilize conventionally insoluble inorganic compounds in water or other solvents using dendritic hosts. Conceptually, these materials have enormous potential for applications such as catalysts or molecular devices.In this work, surface-modified poly(amido-amine) dendrimers were used to prepare {Cu(0)-PAMAM}, {Ag(0)-PAMAM} and {Au(0)-PAMAM} dendrimer-metal nanocomposites containing stable and solvent soluble zero valence metals. Characterization of the resulting nanocomposites has been carried out by TEM, UV-visible spectroscopy, and scattering techniques. Depending on the chemistry of ion preorganization in the dendrimer, internal (“I”), external (“E”) and mixed (“M”) type nanocomposite structures could be identified according to the varying location of the actual metal content.The effect of structural differences was found to be reflected in the optical properties of the nanocomposites.

scholarly journals Preparation and characterization of regenerated cellulose biocomposite film filled with calcium carbonate by in situ precipitation

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 7893-7905
Author(s):  
Qianqian Zhu ◽  
Jingjing Wang ◽  
Jianzhong Sun ◽  
Qianqian Wang
Keyword(s):  
Calcium Carbonate ◽  
Chemical Properties ◽  
Regenerated Cellulose ◽  
X Ray Diffraction ◽  
Uv Visible ◽  
Biocomposite Film ◽  
Physical And Chemical ◽  
And Chemical Properties

The application of cellulose hybrid biocomposites filled with calcium carbonate has attracted wide attention in packaging and other fields in recent years. In this study, regenerated cellulose (RC) films filled with calcium carbonate were successfully prepared by dissolution, regeneration, and in situ precipitation of CaCO3. The optical, mechanical, physical, and chemical properties of biocomposites were examined by UV-visible spectroscopy, tensile testing, scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analyses (TGA). The results showed that RC films with different CaCO3 contents exhibited good flexibility, optical properties, mechanical strength, and thermal stability. The RC biocomposite filled with calcium carbonate showed a tensile strength of 84.7 ± 1.5 MPa at optimum conditions. These RC biocomposites filled with CaCO3 may find application in packaging.

Catalytic Degradation of Methylene Blue Using Gold Nanoparticles Capped by Polyoxyethylene Cholesteryl Ether

2020 ◽  
Vol 12 (10) ◽  
pp. 1236-1240
Author(s):  
Gajendra Rajput ◽  
Niki Pandya
Keyword(s):  
Gold Nanoparticles ◽  
Synthesis Method ◽  
Surfactant Solution ◽  
Complete Characterization ◽  
Positive Development ◽  
Previous Part ◽  
Vis Spectroscopy ◽  
Future Direction

Simple spontaneous and eco-friendly green synthesis method for ultra-stable and catalytic gold nanoparticles (AuNPs) were synthesized through Polyoxyethylene cholesteryl ether (ChEO10) and sodium tetrachloroaurate (III) dihydrate (Na [AuCl4]-2H2O) were prepared at 27 °C (AuNPs were formed in < 2 h). Here the creation of distinct AuNPs is supported by reductive ChEO10 surfactant solution via complexation and in-situ reduction of AuCl4− ions in which ChEO10 acts as self-reducing and stabilising agent. This method is considered as simple and green. The positive development of colloidal AuNPs was monitored by simple UV-Vis spectroscopy. The complete characterization of synthesizing AuNPs was done in the previous part. The resulting AuNPs reveal outstanding catalytic properties for degradation of Methyl Blue (MB) to Leucomethylene blue (LMB) in the presence of NaBH4. We further comment on challenges and future direction of this exciting and rapidly expanding area of research.

Synthesis and Characterization of Silver-Poly(Methylmethacrylate) Nanocomposite

2013 ◽  
Vol 543 ◽  
pp. 80-83
Author(s):  
Judita Puišo ◽  
Valentinas Baltrušaitis ◽  
Algirdas Lazauskas ◽  
Asta Guobienė ◽  
Igoris Prosyčevas ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Reduction Method ◽  
Treatment Time ◽  
Thermal Reduction ◽  
Optical Devices ◽  
Plasmonic Sensors ◽  
Nanocomposite Structures

Silver nanoparticles and polymethylmethacrylate (PMMA) nanocomposite was preparedin situby photo-induced thermal reduction method. The interfacial interaction of Ag nanoparticles and PMMA polymer is investigated using Fourier transform infrared spectroscopy (FTIR). Optical properties of Ag/PMMA films were characterized by UV-Vis and FTIR absorption spectroscopy. Effects of the UV and heat-treatment time on the formation of silver nanoparticles in PMMA matric matrix were studied in detail. These investigations proposed new nanocomposite structures. They can be defined as plasmonic materials with improved optical properties. Ag/PMMA structures may found a number of technological applications: in optical devices, various plasmonic sensors or even in nanomedicine.

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