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Actin Polymerization01:42

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Polymer-based actuators: back to the future.

P Martins1, D M Correia, V Correia

  • 1Centro/Departamento de Física, Universidade do Minho, 4710-057 Braga, Portugal. pmartins@fisica.uminho.pt.

Physical Chemistry Chemical Physics : PCCP
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Summary

This review covers polymer-based actuators, focusing on electromechanical and magnetomechanical types. It analyzes their principles, designs, applications, and future potential for smart devices.

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Area of Science:

  • Smart Materials and Devices
  • Polymer Science
  • Actuator Technology

Background:

  • Polymer-based actuators are crucial for smart materials and devices.
  • They are utilized in diverse fields like biomedical, optical, and electronics.
  • Key types include electromechanical and magnetomechanical actuators based on their energy conversion principles.

Purpose of the Study:

  • To provide a comprehensive and critical review of recent studies on polymer-based actuators.
  • To present operating principles, representative designs, performance analyses, and practical applications.
  • To discuss future development perspectives and guide the design of improved actuators.

Main Methods:

  • Literature review of recent studies on polymer-based actuators.
  • Analysis of operating principles, designs, and performance metrics.
  • Discussion of current limitations and future research directions.

Main Results:

  • Overview of electromechanical and magnetomechanical actuator classifications.
  • Presentation of various designs and their performance characteristics.
  • Identification of current challenges and opportunities for advancement.

Conclusions:

  • Polymer-based actuators are versatile smart materials with significant potential.
  • Understanding past effects and present limitations is key to future innovation.
  • This review serves as a guide for developing next-generation actuators with enhanced performance.