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Related Concept Videos

PD Controller: Design01:26

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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Pharmacodynamic (PD) responses describe the interaction between a drug and its biological target, culminating in a physiological effect. These responses can be classified into different types: continuous variables, such as blood glucose levels; categorical outcomes, like survival rates; and time-to-event metrics, such as disease progression. Understanding and modeling PD responses are critical for optimizing drug efficacy and safety.PD models describe the relationship between drug concentration...
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
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Reaction-diffusion phenomena in a PDMS matrix can modify its topography.

Christophe Provin1, Teruo Fujii

  • 1Institute of Industrial Sciences, The University of Tokyo, Center for International Research on MicroMechatronics, 4-6-1-FW601, Komaba, Meguro-ku, Tokyo, 153-8505, Japan. cprovin@iis.u-tokyo.ac.jp

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Summary
This summary is machine-generated.

Reagents absorbed into polydimethylsiloxane (PDMS) can react internally, altering the material

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Polydimethylsiloxane (PDMS) is a widely used silicone elastomer.
  • Absorption of reagents and solvents into PDMS can affect its performance.
  • Potential for chemical reactions within the PDMS matrix is a concern.

Purpose of the Study:

  • To investigate the hypothesis that absorbed reagents can react within PDMS.
  • To demonstrate the physical modification of PDMS surface topography via internal reactions.
  • To explore the generation of wrinkles or pores on PDMS surfaces.

Main Methods:

  • Absorption of various reagents and solvents into PDMS.
  • Observation and analysis of internal chemical reactions within the PDMS matrix.
  • Characterization of surface topography changes, including wrinkle and pore formation.

Main Results:

  • Confirmed that absorbed reagents can undergo reactions within the PDMS elastomer.
  • Demonstrated that these internal reactions lead to physical modifications of the PDMS surface.
  • Successfully generated surface wrinkles and pores through controlled internal reactions.

Conclusions:

  • Internal reactions of absorbed substances offer a novel method for PDMS surface modification.
  • This phenomenon provides a pathway to engineer PDMS surface topography for specific applications.
  • Understanding and controlling these reactions can enhance PDMS material properties and functionalities.