Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

5.9K
The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
5.9K
Diode: Reverse bias01:14

Diode: Reverse bias

2.1K
A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
2.1K
Modeling of Diode Reverse Characteristics01:14

Modeling of Diode Reverse Characteristics

660
In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
When a reverse voltage applied to a Zener diode exceeds its breakdown voltage, the diode enters the breakdown region. At this point, the...
660
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

3.3K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
3.3K
Implicit Differentiation01:25

Implicit Differentiation

72
In classical mechanics, motion is often described through relationships between spatial coordinates and time. A car moving along a straight highway with constant acceleration serves as a simple case where velocity is an explicit function of time. This scenario results in a linear equation, enabling straightforward analysis using basic differentiation techniques.In contrast, a satellite in circular orbit follows a path defined by an implicit function. The position of the satellite is constrained...
72
Logarithmic Differentiation01:28

Logarithmic Differentiation

77
When a car’s weight and driving forces act on a tire, they impose an external load on the rubber material. This load is resisted internally by forces distributed throughout the tire structure, which are defined as stress. The resulting deformation of the rubber due to this stress is quantified as strain. The relationship between stress and strain governs how the tire deforms under load and is central to understanding its mechanical response during operation.Rubber exhibits a nonlinear...
77

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Enhancement of ergothioneine production by discovering and regulating its metabolic pathway in Cordyceps militaris.

Microbial cell factories·2022
Same author

IQGAP1 and RNA Splicing in the Context of Head and Neck via Phosphoproteomics.

Journal of proteome research·2022
Same author

Ubiquitin ligase RNF125 targets PD-L1 for ubiquitination and degradation.

Frontiers in oncology·2022
Same author

Case report: A case of heterogeneity of the antitumor response to immune checkpoint inhibitors in a patient with relapsed hepatocellular carcinoma.

Frontiers in oncology·2022
Same author

Upregulation of CCNB2 and Its Perspective Mechanisms in Cerebral Ischemic Stroke and All Subtypes of Lung Cancer: A Comprehensive Study.

Frontiers in integrative neuroscience·2022
Same author

Novel Agents For Relapsed and Refractory Classical Hodgkin Lymphoma: A Review.

Frontiers in oncology·2022

Related Experiment Video

Updated: Feb 14, 2026

Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei
09:23

Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei

Published on: March 23, 2022

2.4K

Reversing Coffee-Ring Effect by Laser-Induced Differential Evaporation.

Tony M Yen1, Xin Fu2, Tao Wei3

  • 1Department of Bioengineering, University of California San Diego, La Jolla, CA, 92093-0412, United States.

Scientific Reports
|February 18, 2018
PubMed
Summary

We developed laser-induced differential evaporation to eliminate the coffee-ring effect in drying droplets. This method concentrates particles into a central peak, improving applications like DNA analysis and inkjet printing.

More Related Videos

The Hawaii Protocol for Scientific Monitoring of Coffee Berry Borer: a Model for Coffee Agroecosystems Worldwide
14:29

The Hawaii Protocol for Scientific Monitoring of Coffee Berry Borer: a Model for Coffee Agroecosystems Worldwide

Published on: March 19, 2018

8.5K
Laser-induced Forward Transfer of Ag Nanopaste
08:07

Laser-induced Forward Transfer of Ag Nanopaste

Published on: March 31, 2016

11.8K

Related Experiment Videos

Last Updated: Feb 14, 2026

Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei
09:23

Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei

Published on: March 23, 2022

2.4K
The Hawaii Protocol for Scientific Monitoring of Coffee Berry Borer: a Model for Coffee Agroecosystems Worldwide
14:29

The Hawaii Protocol for Scientific Monitoring of Coffee Berry Borer: a Model for Coffee Agroecosystems Worldwide

Published on: March 19, 2018

8.5K
Laser-induced Forward Transfer of Ag Nanopaste
08:07

Laser-induced Forward Transfer of Ag Nanopaste

Published on: March 31, 2016

11.8K

Area of Science:

  • Physics
  • Materials Science
  • Biotechnology

Background:

  • The coffee-ring effect, a common phenomenon in evaporating droplets, leads to uneven particle deposition.
  • This effect negatively impacts various applications, including microarray fabrication, inkjet printing, and liquid biopsy analysis.

Purpose of the Study:

  • To introduce a novel method, laser-induced differential evaporation, to eliminate the coffee-ring effect.
  • To engineer droplet evaporation profiles for controlled particle deposition without additives or surface modifications.

Main Methods:

  • Utilized a CO2 laser to irradiate the apex of drying droplets, inducing differential evaporation.
  • Employed internal flow tracking and surface evaporation flux mapping to study physical mechanisms.
  • Developed an analytical model to theoretically investigate the process.

Main Results:

  • Successfully eliminated the coffee-ring effect, transitioning particle deposition from a ring to a central peak.
  • Achieved precise particle concentration within a 100 μm diameter area, preventing peripheral stains.
  • Shifted the droplet drying mode from constant contact radius (CCR) to constant contact angle (CCA).

Conclusions:

  • Laser-induced differential evaporation offers an effective, additive-free solution to the coffee-ring effect.
  • This technique enhances particle deposition control for advanced applications in biotechnology and materials science.
  • The method demonstrates a significant advancement in managing droplet evaporation for precise material patterning.