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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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An Atomic-Level Bimetallic MOF Platform Overcoming the Stability-Performance Tradeoff for Laser Propulsion.

Senlin Rao1,2, Gang Tang1, Shizhuo Zhang2

  • 1Jiangxi Provincial Key Laboratory of Precision Drive and Equipment, Jiangxi University of Water Resources and Electric Power, Nanchang, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|March 13, 2026
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Summary

This study introduces a new bimetallic framework (FeCu-MOFs) for photon-based propulsion, significantly improving stability and performance. The material shows enhanced water resistance and record-breaking propulsion metrics.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Aerospace Engineering

Background:

  • Photon-based propulsion requires materials with high thrust efficiency and environmental stability.
  • Existing materials face a trade-off between performance and resistance to degradation, especially hydrolysis.
  • Developing robust materials is crucial for advanced propulsion systems operating in demanding conditions.

Purpose of the Study:

  • To establish a materials design paradigm for simultaneous enhancement of stability and performance in photon-based propulsion.
  • To introduce an atomic-level bimetallic platform to overcome the stability-performance trade-off.
  • To develop novel energetic materials resistant to hydrolysis and efficient in photothermal conversion.

Main Methods:

  • Synthesis of bimetallic FeCu-MOFs (Metal-Organic Frameworks) using a one-step laser method.
  • Co-crystallization of Fe3+ and Cu2+ with tricarboxylate ligands to form an HKUST-1 derivative.
  • Application of hard-soft acid-base principles for material design and optimization.

Main Results:

  • Achieved a 20-fold increase in water resistance while preserving crystalline integrity.
  • Enhanced photothermal conversion efficiency to 91% through synergistic energy dissipation (Fe3+→Cu2+ d-orbital charge transfer).
  • Optimized FeCu-MOF-M variant demonstrated record propulsion metrics, including impulse coupling coefficient (191.80 µN/W) and specific impulse (631.19 s).

Conclusions:

  • The stoichiometry-driven photothermal synergy in bimetallic frameworks provides a robust platform for next-generation energetic materials.
  • This approach successfully unifies hydrolysis resistance, efficient photothermal conversion, and atomic-level tunability.
  • The developed FeCu-MOFs offer a promising solution for advanced propulsion systems in harsh environments.