A new approach to the calorimetric investigation of physical and chemical transitions

1993 ◽  
Vol 40 (3) ◽  
pp. 949-955 ◽  
Author(s):  
M. Reading ◽  
D. Elliott ◽  
V. L. Hill
Keyword(s):  
Calorimetric Investigation ◽  
New Approach ◽  
Physical And Chemical

scholarly journals Hybrid Polymer-Immobilized Nanosized Pd Catalysts for Hydrogenation Reaction Obtained via Frontal Polymerization

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Anatolii D. Pomogailo ◽  
Gulzhian I. Dzhardimalieva
Keyword(s):  
Pd Nanoparticles ◽  
Hydrogenation Reaction ◽  
Frontal Polymerization ◽  
Hybrid Nanocomposites ◽  
Pd Catalysts ◽  
New Approach ◽  
Inorganic Composites ◽  
Nondestructive Testing Method ◽  
Physical And Chemical ◽  
Polymer Stabilized

A new approach to the synthesis of mixed-type immobilized catalysts by frontal polymerization of metal-containing monomer in the presence of highly dispersed mineral support has been developed. Synthesis of the acrylamide Pd(II) nitrate complex, Pd(CH2=CHCONH2)2 (NO3)2 (PdAAm), on the SiO2 (Al2O3, C) surface and its consequent frontal polymerization and reduction lead to the formation of organic-inorganic composites with polymer-stabilized Pd nanoparticles. The immobilized metal complexes and palladium nanoparticles were characterized by various physical and chemical methods. The synthesized hybrid nanocomposites are efficient and selective catalysts for hydrogenation of cyclohexene, alkene, and acetylene alcohols, as well as di- and trinitrotoluene. Catalyst intermediates separated by nondestructive testing method have been described and changing in the palladium charge during the catalytic process has been identified.

Defect-Free Chemical Functionalization of Magnetic Monolayers Based on Coordination Polymers

2018 ◽  
Author(s):  
Javier López-Cabrelles ◽  
Samuel Mañas-Valero ◽  
Iñigo J. Vitórica-Yrezábal ◽  
Pablo J. Bereciartúa ◽  
J. Alberto Rodríguez-Velamazán ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
2D Materials ◽  
Chemical Properties ◽  
Benzimidazole Derivatives ◽  
Synthetic Method ◽  
New Approach ◽  
Chemical Functionalization ◽  
Powerful Approach ◽  
Physical And Chemical ◽  
And Chemical Properties

<p>Chemical functionalization has demonstrated to be a powerful approach to tailor the physical and chemical properties of two-dimensional (2D) materials, to increase their processability and</p> <p>stability, to add new functionalities and, even, to create new 2D materials. However, this post synthetic method – which involves the anchoring of molecules on the surface of an exfoliated 2D crystal – inevitably leads to defective materials, which lack long-range structural order. If defect-free functionalized monolayers are required, a radically new approach needs to be developed. Here we present a pre-synthetic method based on coordination chemistry that affords the isolation of crystalline functionalized monolayers. This involves functionalization of the ligand prior to the formation of the 2D material. The concept is illustrated using layered coordination polymers formed by reacting various benzimidazole derivatives with ferrocene. This surface tuneability, together with the robust magnetic and mechanical properties of these 2D materials, make them exceptional candidates for studying the magnetism in the 2D limit, as well as for developing membranes for selective molecular sensing.</p>

Bulrush-Like Double Perovskite: Synthesis, Tunneling Magnetoresistance, and Magnetocaloric Effects

2008 ◽  
Vol 8 (6) ◽  
pp. 2793-2810 ◽  
Author(s):  
W. Zhong ◽  
N. J. Tang ◽  
C. T. Au ◽  
Y. W. Du
Keyword(s):  
Room Temperature ◽  
Recent Observation ◽  
Chemical Properties ◽  
Double Perovskite ◽  
Tunneling Magnetoresistance ◽  
Double Perovskites ◽  
New Approach ◽  
Half Metallic ◽  
Physical And Chemical ◽  
And Chemical Properties

The recent observation of room temperature tunneling magnetoresistance (TMR) in half-metallic A2FeMoO6 (A = Ca, Sr, Ba) double perovskites, and their importance to the emerging field of spintronics has led to considerable effort being dedicated to detailed investigations of the physical and chemical properties of these materials. This article will present an review of our recent investigations covering the synthesis, structures, magnetic and transport properties of "bulrush-like" A2FeMoO6 (A = Sr, Ba). Utilizing the high shape anisotropy as well as the reactivity of A2FeMoO6 to water and a sonochemical technique, we managed to manipulate the properties of grain boundary barriers, and thus put forward a new approach for the enhancement of room temperature TMR. The magnetocaloric effects of A2FeMoO6 double perovskites will also be discussed.

scholarly journals Pharmacognostic, Physicochemical and Anti-Oxidant Screening of Solenostemma Argel’s Leaf Extract

2020 ◽  
Vol 5 (9) ◽  
pp. 1202-1206
Author(s):  
Mehad Mustafa Adam Khamiss ◽  
Prakash C. Choudhary
Keyword(s):  
Nitric Oxide ◽  
Antioxidant Activity ◽  
Leaf Extract ◽  
New Approach ◽  
Anti Oxidant ◽  
Lead Generation ◽  
Prominent Response ◽  
Tribal Region ◽  
Physical And Chemical ◽  
Ethanolic Leaf Extract

The present work deals with the identification of new approach towards the lead generation in medicinal chemistry and authenticating the reports present on the use of this Sudanese medicinal plant Solenostemma argel in the tribal region of Sudan. The pharmacognostic screening showed its physical and chemical composition with identification of active ingredients. The antioxidant activity was carried out by DPPH and nitric oxide scavenging method. In which ethanolic leaf extract showed prominent response which may be due to the promising presence of flavonoids and related poly phenolic compounds in it

Defect-Free Chemical Functionalization of Magnetic Monolayers Based on Coordination Polymers

2018 ◽  
Author(s):  
Javier López-Cabrelles ◽  
Samuel Mañas-Valero ◽  
Iñigo J. Vitórica-Yrezábal ◽  
Pablo J. Bereciartúa ◽  
J. Alberto Rodríguez-Velamazán ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
2D Materials ◽  
Chemical Properties ◽  
Benzimidazole Derivatives ◽  
Synthetic Method ◽  
New Approach ◽  
Chemical Functionalization ◽  
Powerful Approach ◽  
Physical And Chemical ◽  
And Chemical Properties

<p>Chemical functionalization has demonstrated to be a powerful approach to tailor the physical and chemical properties of two-dimensional (2D) materials, to increase their processability and</p> <p>stability, to add new functionalities and, even, to create new 2D materials. However, this post synthetic method – which involves the anchoring of molecules on the surface of an exfoliated 2D crystal – inevitably leads to defective materials, which lack long-range structural order. If defect-free functionalized monolayers are required, a radically new approach needs to be developed. Here we present a pre-synthetic method based on coordination chemistry that affords the isolation of crystalline functionalized monolayers. This involves functionalization of the ligand prior to the formation of the 2D material. The concept is illustrated using layered coordination polymers formed by reacting various benzimidazole derivatives with ferrocene. This surface tuneability, together with the robust magnetic and mechanical properties of these 2D materials, make them exceptional candidates for studying the magnetism in the 2D limit, as well as for developing membranes for selective molecular sensing.</p>

Non-Crystallographic Nanopores in Single Crystals: A New Approach in Nanomaterials Chemistry

2004 ◽  
Vol 443-444 ◽  
pp. 217-222
Author(s):  
Claus J.H. Jacobsen ◽  
Iver Schmidt ◽  
Michael Brorson ◽  
Astrid Boisen ◽  
Thomas W. Hansen ◽  
...  
Keyword(s):  
Single Crystals ◽  
Chemical Properties ◽  
Metal Sulfide ◽  
Building Blocks ◽  
New Approach ◽  
New Family ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanomaterials are the building blocks of nanotechnology. Recently, nanotube materials have attracted considerable attention due to their unique physical and chemical properties. Here we discuss how nanotubes can be used as templates for preparation of a new family of materials, the nanoporous single crystals, and for the preparation of metal sulfide nanotube materials. Today, the characterization of these materials depends heavily on electron microscopy. However, as rational synthesis schemes are becoming available, more well-defined, homogeneous nanotube samples will be produced and the role of diffraction techniques may increase.

scholarly journals Mycotoxin management through transformations – A review

2017 ◽  
Vol 9 (4) ◽  
pp. 2214-2220
Author(s):  
Archana Negi ◽  
Roopali Sharma ◽  
Nandani Shukla ◽  
Sourav Kumar Modak ◽  
Manjari Negi ◽  
...  
Keyword(s):  
New Technologies ◽  
Management Strategies ◽  
Fungal Metabolites ◽  
Agricultural Commodities ◽  
New Approach ◽  
Metabolic Products ◽  
Food And Feed ◽  
Transformation Methods ◽  
Chemical Strategies ◽  
Physical And Chemical

Mycotoxins are toxic secondary metabolic products of various fungi, mainly belonging to the genera Fusarium (Trichothecenes, Zearalenone), Aspergillus (Aflatoxin) and Penicillium (Ochratoxin) and can be found in almost 25% of the world’s agricultural commodities. These compounds are toxic to humans, animals and plants and therefore, efforts should be made to avoid mycotoxin contamination in food and feed. It has been estimated that at least 300 of these fungal metabolites are potentially toxic to animals and humans. In India 50% losses of agricultural commodities are due to postharvest losses. A number of physical and chemical approaches have already been taken to reduce the effect of mycotoxins, but due to certain limitations of physical and chemical strategies prompted search for other solutions to the mycotoxin hazards. Thus, there is an increasing public pressure for a safer and eco-friendly alternative to control these organisms. Consequently, a new approach is applied for managing mycotoxins through transformations that offer specific, efficient and eco-friendly way for detoxification of mycotoxins. This review aims to brings about the up-to-date management strategies mainly through transformation (genetic and bio) to pre-vent or reduce post harvest damages to the crops caused by storage fungi and the contamination of food and feed by mycotoxins. It will make aware of the new technologies or management methods for mycotoxins through transformation. The transformation methods may become the technology of choice, as they offer a specific, irreversible, efficient and environment friendly way of detoxification that leaves neither toxic residues nor any undesirable by-products.

scholarly journals Instabilities of proteins: theoretical aspects, degradation products and methods for their detection

2005 ◽  
Vol 51 ◽  
pp. 3-8
Author(s):  
Suzana Trajkovic-Jolevska ◽  
Jasmina Tonic-Ribarska ◽  
Aneta Dimitrovska
Keyword(s):  
Recombinant Dna ◽  
Degradation Products ◽  
Biological Activities ◽  
Chemical Degradation ◽  
Recombinant Dna Technology ◽  
New Approach ◽  
Chemical Instabilities ◽  
The Stability ◽  
Physical And Chemical ◽  
Modified Forms

Recombinant DNA technology has led to a significant increase in the number of peptide and protein based pharmaceuticals, giving a new approach to combat poorly controlled diseases. This particular development has been reached in the last two decades. However, proteins are highly susceptible of physical and chemical degradation resulting in a decrease or complete loss of biological activities. Reasons for their physical and chemical instabilities and the methods for their examination, become a challenge for the pharmaceutical scientists for successful development of stabile protein - based pharmaceuticals. The stability of protein - based pharmaceuticals is significant in terms of their pharmaceutical quality and biological activity. In addition, a right choice of suitable analytical methods is needed in order to detect an early formation of degradation products or modified forms.

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