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Covalent Organic Frameworks : Chemistry, Materials and Applications
A comprehensive introduction to a groundbreaking polymer class Covalent Organic Frameworks (COFs) are materials that form two- or three-dimensional porous crystalline structures held together by strong covalent bonds.First described only in 2005, COFs have subsequently exploded as a field of study, with recent progress enormously enhancing scientific and industrial capacity for designing these organic materials by means of one-pot direct polymerization.The flexibility and predictability of these structures is part of what has given them applications in semiconductor construction, catalysis, energy storage, and more.Covalent Organic Frameworks: Chemistry, Materials, and Applications (2V set) provides a unique, comprehensive introduction to COFs and their chemistry, materials, and applications.It outlines the fundamentals of COF design, synthesis, and applications, offering a broad overview of both the origins of this thriving field and its many more recent developments.It equips readers with the tools to tailor COF design and production to a limitless range of potential scientific and industrial needs.Covalent Organic Frameworks readers will also find: Detailed treatment of design, synthesis, and computational approaches for a variety of specific COFsUnique comprehensive approach covers all possible reader needs in two accessible volumesDiscussion of connections between COF polymer chemistry and other fields including organic chemistry, computational chemistry, photochemistry, and more Covalent Organic Frameworks is a useful reference for organic chemists, materials scientists, polymer chemists, structural chemists, and more.
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Non-covalent Interactions in Coordination and Organometallic Chemistry
Non-covalent interactions in coordination and organometallic compounds (hydrogen, halogen, chalcogen, pnictogen, tetrel, and semi-coordination bonds; agosic and anagosic interactions; stacking, anion-/cation-Ï€ interactions; metallophilic interactions, etc.) are topical in modern chemistry, materials science, crystal engineering, and related fields of knowledge. Both experimental and theoretical methods are widely used for investigations of the nature and various properties of such weak contacts in gas, liquid, and solid states. Non-covalent interactions could be the driving force to design smart materials with valuable redox, electronic, mechanical, magnetic, and optical properties, which is promising for the manufacture of LEDs, photovoltaic cells of solar power plants, porous structures, sensors, battery cells, and liquid crystals.This Special Issue highlights and presents an overview of modern trends in non-covalent interactions in coordination and organometallic compounds, and bringing various different types to the attention of the scientific community.
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Stamina : A Journey of Renewal for Your Weary Soul
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Adaptogens : Herbs for Strength, Stamina, and Stress Relief
An updated and expanded edition of the definitive guide to adaptogenic herbs • Includes a Materia Medica with monographs covering 25 adaptogens, including eleuthero, ginseng, rhodiola, schisandra, ashwagandha, licorice, shatavari, reishi, and holy basil, as well as complementary nervines, restorative tonics, and nootropics • Explains how adaptogens increase the body’s resistance to adverse influences, increase energy and stamina, and counter the effects of age and stress on the body • Details the actions, properties, preparation, and dosage for each herb and their uses in Ayurveda and Chinese medicine and as remedies for animals Every day our bodies strive to adapt and stay balanced, energized, and healthy, yet chronic stress and the resulting elevation of stress hormones such as cortisol have been shown to be major factors behind not only fatigue and weight gain but also many chronic and degenerative diseases.In this updated edition of the definitive guide to adaptogenic herbs, clinical herbalist David Winston and researcher Steven Maimes provide a comprehensive look at adaptogens: non-toxic herbs such as ginseng, eleuthero, and ashwagandha that help the body “adapt” to the many influences it encounters and manage the stresses it experiences.They also increase stamina and energy, boost cognitive function, restore the immune system, and counter the effects of aging, especially when used in appropriate combinations. Beginning with a history of the use of adaptogens, including in Ayurveda, Chinese medicine, and Russian medicine, the book examines how these herbal remedies work and why they are so effective at combating stress-induced illness and ailments.The extensive Materia Medica includes monographs on 25 adaptogens, including eleuthero, ginseng, rhodiola, schisandra, ashwagandha, shatavari, reishi, and holy basil, as well as complementary nervines, restorative tonics, and nootropic herbs, such as milky oats, astragalus, St.John’s wort, and ginkgo. Each monograph presents the latest scientific research and details the origin, traditional and clinical uses, actions, properties, preparation, and dosage for each herb.The book also includes guidance on adaptogenic remedies for our animal companions. Aimed not only at herbalists but also those interested in natural health, this guide to adaptogens will allow you to safely and effectively use these herbal remedies to enhance your health and improve your chances of living a longer, healthier, and well-balanced life.
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What is covalent development?
Covalent development is a term used in the context of software development to describe a collaborative approach to building and maintaining software. It involves multiple developers working together on the same codebase, using version control systems to manage changes and updates. Covalent development emphasizes communication, teamwork, and shared responsibility for the code, leading to a more efficient and cohesive development process. This approach allows for greater flexibility and adaptability in responding to changes and challenges in the development process.
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What are covalent bonds?
Covalent bonds are a type of chemical bond formed between two atoms when they share one or more pairs of electrons. This sharing of electrons allows both atoms to achieve a more stable electron configuration, typically by filling their outermost energy levels. Covalent bonds are typically found in molecules and are responsible for holding the atoms together to form the structure of the molecule. These bonds can be either polar, where the shared electrons are not equally distributed between the atoms, or nonpolar, where the shared electrons are equally distributed.
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What is a covalent bond?
A covalent bond is a type of chemical bond that involves the sharing of electron pairs between atoms. This sharing of electrons allows each atom to achieve a more stable electron configuration, typically by filling their outermost energy level. Covalent bonds are typically found in molecules and are stronger than other types of chemical bonds, such as ionic bonds. The number of shared electrons can vary, leading to different types of covalent bonds, such as single, double, or triple bonds.
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Can you explain the covalent bond?
A covalent bond is a type of chemical bond that involves the sharing of electron pairs between atoms. This sharing of electrons allows each atom to achieve a full outer electron shell, making the atoms more stable. Covalent bonds are typically formed between nonmetal atoms, and the strength of the bond is determined by the number of shared electrons and the distance between the nuclei of the atoms. Covalent bonds can be either polar or nonpolar, depending on the electronegativity difference between the atoms involved.
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What does "covalent" mean in chemistry?
In chemistry, "covalent" refers to a type of chemical bond that involves the sharing of electron pairs between atoms. This type of bond is formed between nonmetal atoms and is characterized by the atoms sharing electrons in order to achieve a stable electron configuration. Covalent bonds are typically strong and result in the formation of molecules.
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Is covalent bonding a difficult topic?
Covalent bonding can be a challenging topic for some students due to its abstract nature and the need to understand concepts such as electron sharing and molecular geometry. However, with proper explanation and practice, students can grasp the fundamentals of covalent bonding. It is important to break down the concepts into simpler parts and provide real-world examples to help students understand the concept better. With patience and practice, students can overcome the difficulties associated with covalent bonding.
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What is a non-covalent bond?
A non-covalent bond is a type of chemical bond that does not involve the sharing of electrons between atoms. Instead, non-covalent bonds are formed through electrostatic interactions, such as hydrogen bonding, van der Waals forces, and ion-dipole interactions. These bonds are generally weaker than covalent bonds and can be easily broken under certain conditions.
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What is a nonpolar covalent bond?
A nonpolar covalent bond is a type of chemical bond where two atoms share electrons equally. This occurs when the difference in electronegativity between the two atoms is very small or nonexistent. As a result, there is no separation of charge within the bond, making it nonpolar. Nonpolar covalent bonds are typically found between atoms of the same element or between atoms with similar electronegativities.
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