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Related Concept Videos

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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Water as an Intrinsic Structural Element in Cellulose Fibril Aggregates.

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Water molecules at cellulose microfibril interfaces stabilize aggregates by lowering free energy. This occurs due to favorable electrostatic interactions, overcoming immobilization penalties and impacting material properties.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biophysics

Background:

  • Water's interaction with cellulose is crucial in biological and engineered materials.
  • The precise molecular mechanisms of water's role at cellulose interfaces remain unclear.

Purpose of the Study:

  • To investigate the thermodynamic implications of water at cellulose microfibril-microfibril interfaces.
  • To elucidate the molecular-level contributions of interfacial water to cellulose aggregate stability.

Main Methods:

  • Utilizing molecular dynamics simulations to model water behavior at cellulose interfaces.
  • Analyzing the free energy changes associated with water molecules at microfibril interfaces.

Main Results:

  • A thin water layer at microfibril interfaces achieves thermal equilibrium with bulk water.
  • This interfacial water lowers the system's free energy, primarily through enthalpic gains.
  • Favorable electrostatic interactions between water and cellulose hydroxyl groups drive this stabilization.

Conclusions:

  • Interfacial water molecules stabilize cellulose fibril aggregates by optimizing electrostatic interactions.
  • The enthalpic benefits of interfacial water outweigh the entropic costs of immobilization.
  • This finding offers insights into water's role in cellulose structure and function, analogous to its role in proteins.