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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Cellulose and Pectic Polysaccharides01:15

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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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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Elastic coupling between spin-crossover particles and cellulose fibers.

S Rat1, V Nagy2, I Suleimanov1

  • 1LCC, CNRS & University of Toulouse (UPS, INPT), 205 route de Narbonne, 31077 Toulouse, France. azzedine.bousseksou@lcc-toulouse.fr.

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Novel cellulose-based composites with spin crossover particles show enhanced mechanical properties. These materials exhibit a reversible 10% modulus increase upon magnetic switching, paving the way for new actuator technologies.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Cellulose is a sustainable and abundant biopolymer with inherent mechanical properties.
  • Spin crossover (SCO) materials offer tunable properties based on external stimuli like temperature or magnetic fields.
  • Combining cellulose with SCO micro-particles presents an opportunity for developing advanced functional materials.

Purpose of the Study:

  • To investigate the mechanical properties of composite materials composed of cellulose fibers and spin crossover micro-particles.
  • To evaluate the impact of the spin state transition of SCO particles on the composite's viscoelastic behavior.
  • To explore the potential of these composites as novel actuator materials.

Main Methods:

  • Magnetic measurements were employed to characterize the spin crossover behavior of the micro-particles.
  • Dynamic Mechanical Analysis (DMA) was used to measure the storage and loss modulus of the cellulose handsheet and the composite.
  • The temperature-dependent mechanical response of the composites was analyzed around the spin transition temperature.

Main Results:

  • The storage modulus of the cellulose handsheet (0.6 GPa) was significantly enhanced in the composite (1.7 GPa).
  • A reversible increase of approximately 10% in the storage modulus was observed upon switching the SCO particles from the low spin (LS) to the high spin (HS) state.
  • A distinct loss modulus peak was detected around the spin transition temperature, indicating strong viscoelastic coupling between SCO particles and the cellulose matrix.

Conclusions:

  • Cellulose-SCO micro-particle composites exhibit significantly improved mechanical properties compared to neat cellulose.
  • The spin crossover transition in the micro-particles induces a reversible change in the composite's mechanical response.
  • These findings demonstrate the potential of spin crossover-polymer composites for developing novel actuator materials.