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Related Concept Videos

Impact Loading01:19

Impact Loading

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
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Eccentric Loading01:16

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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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Distributed Loads01:19

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Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
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Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
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Stress: General Loading Conditions01:15

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To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
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General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
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Updated: Jan 26, 2026

Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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α-Cyclodextrins Polyrotaxane Loading Silver Sulfadiazine.

Sa Liu1,2, Chunting Zhong3,4, Weiwei Wang5,6

  • 1School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China. sliu@scut.edu.cn.

Polymers
|April 11, 2019
PubMed
Summary

Polyrotaxane (PR) loaded with silver sulfadiazine (SD-Ag) creates a stable, slow-release antibacterial material. This novel PR-(SD-Ag) composite exhibits enhanced properties against common bacteria.

Keywords:
antibacterialmechanismpolyrotaxanesilver sulfadiazine

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Pharmacology

Background:

  • Polyrotaxane (PR) serves as a drug carrier for targeted delivery and sustained release.
  • Silver sulfadiazine (SD-Ag) is an emerging antibiotic agent with potential therapeutic applications.

Purpose of the Study:

  • To synthesize and characterize a novel antibacterial material by loading SD-Ag onto PR.
  • To evaluate the drug loading capacity, encapsulation efficiency, and in vitro release profile of the PR-(SD-Ag) composite.
  • To assess the antibacterial activity and light stability of the developed material.

Main Methods:

  • Polyrotaxane (PR) synthesized using α-cyclodextrin (CD) and poly(ethylene glycol) (PEG).
  • Silver sulfadiazine (SD-Ag) loaded onto PR at various mass ratios to form PR-(SD-Ag).
  • Characterization of loading capacity, encapsulation efficiency, in vitro release kinetics, antibacterial activity against E. coli and S. aureus, and light stability.

Main Results:

  • Optimal loading capacity and encapsulation efficiency of 90% achieved at a 1:1 PR:SD-Ag mass ratio.
  • Stable and slow in vitro release of SD-Ag over 6 days, with cumulative release exceeding 85%.
  • PR-(SD-Ag) demonstrated superior light stability compared to SD-Ag alone and exhibited excellent antibacterial properties against E. coli and S. aureus.

Conclusions:

  • The PR-(SD-Ag) composite offers a promising platform for sustained antibiotic delivery.
  • Hydrogen bonding between SD-Ag and α-CD likely facilitates the loading mechanism.
  • The developed material presents enhanced stability and potent antibacterial efficacy, suggesting its potential in wound healing and infection control applications.