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Solution Composition During Acid/Base Titrations01:17

Solution Composition During Acid/Base Titrations

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The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
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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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Composite Bodies00:55

Composite Bodies

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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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Related Experiment Video

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Rapid Manufacturing of Thin Soft Pneumatic Actuators and Robots
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MXene/Cellulose Nanofibers Composite-Based Multiresponsive Soft Actuator for Programmable Soft Robots.

De-Min Zhang1, Jia-Hui Zhang1, Bo Ma1

  • 1Shanxi Key Laboratory of Artificial Intelligence & Micro Nano Sensors, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, China.

ACS Applied Materials & Interfaces
|January 22, 2026
PubMed
Summary

Researchers created a new flexible actuator using MXene/cellulose nanofibers (MXC) and polypropylene (BOPP) tape. This multiresponsive actuator can be programmed for complex 2D-to-3D shapes, advancing soft robotics applications.

Keywords:
MXene-cellulose nanofibersactuatorsmultiresponsiveshape programmabilitysoft robots

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Area of Science:

  • Materials Science
  • Robotics Engineering
  • Nanotechnology

Background:

  • Flexible actuators are crucial for soft robots, enabling energy conversion into mechanical motion.
  • Existing actuators face challenges in multistimulus responsiveness, shape programmability, and mechanical stability for complex environments.

Purpose of the Study:

  • To develop a novel multiresponsive and programmable bilayer actuator.
  • To overcome limitations of current actuators in terms of responsiveness, programmability, and stability.

Main Methods:

  • Fabrication of a bilayer actuator using MXene/cellulose nanofibers (MXC) composite film and biaxially oriented polypropylene (BOPP) tape.
  • Leveraging hygroscopic, photothermal, and electrothermal properties of MXC, and thermal expansion of BOPP for actuation.
  • Employing pattern design and macroscopic reassembly for programmable 2D-to-3D deformations.

Main Results:

  • The actuator demonstrated reversible, large-angle, and stable bending under humidity, light, and electrical stimuli.
  • Achieved programmable complex deformations by combining pattern design and reassembly strategies.
  • Successfully developed proof-of-concept soft robots, including a biomimetic leaf, smart gripper, and crawling beetle robot.

Conclusions:

  • The developed MXC/BOPP bilayer actuator offers enhanced multi-stimulus responsiveness and shape programmability.
  • This actuator design holds significant potential for advancing the capabilities and applications of next-generation soft robotics.