Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Temperature Dependence on Reaction Rate

Temperature Dependence on Reaction Rate

The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...

Le Chatelier's Principle: Changing Temperature

Le Chatelier's Principle: Changing Temperature

Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:

Effects of Temperature on Free Energy

Effects of Temperature on Free Energy

The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:

Effect of Temperature Change on Reaction Rate

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,

Temperature and Thermal Equilibrium

Temperature and Thermal Equilibrium

Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...

Temperature Dependent Deformation

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...

You might also read

Related Articles

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

Sort by

Same author

Case of Compound Fracture of the Ankle Joints.

The Medical and physical journal·2018

Same author

Colon examination in patients with proven colorectal cancer.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2013

Same author

Nuffield Birthday Fund.

Canadian Medical Association journal·2010

Same author

Hyperfine Structure in the Rotational Spectrum of GaF: A Comparison of Experimental and Calculated Spin-Rotation and Electric Field Gradient Tensors.

Journal of molecular spectroscopy·2001

Same author

Equilibrium Structure and Spectroscopic Constants of Difluorovinylidene: An ab Initio Study.

Journal of molecular spectroscopy·2001

Same author

The role of soft tissue reconstruction after melanoma resection in the head and neck

Head & neck·2001

Search research articles

Related Experiment Video

Updated: Jul 25, 2026

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Published on: January 26, 2016

Using temperature to tune film roughness: nonintuitive behavior in a simple system

Stoldt¹, Caspersen, Bartelt

¹Departments of Chemistry, Mathematics, and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters

|September 16, 2000

Summary

Thin-film growth of silver (Ag) on Ag(100) shows complex roughness changes with temperature. A transition from mound to self-affine growth occurs around 135 K, explained by an atomistic model.

More Related Videos

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Related Experiment Videos

Last Updated: Jul 25, 2026

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Published on: January 26, 2016

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Area of Science:

Surface science
Materials science
Condensed matter physics

Background:

Ag(100) homoepitaxy is a fundamental system for studying thin-film deposition.
Understanding thin-film growth dynamics is crucial for materials development.

Purpose of the Study:

To investigate the complex temperature-dependent roughness variations in Ag(100) homoepitaxy.
To identify the growth mechanisms and transitions occurring during thin-film formation.

Main Methods:

Experimental deposition of 25-monolayer Ag films on Ag(100) at varying temperatures (50 K to 300 K).
Analysis of film roughness as a function of deposition temperature.
Development and application of an atomistic model to simulate growth mechanisms.

Main Results:

Observed non-monotonic roughness variation with decreasing deposition temperature: increase, decrease, then increase again.
Identified a growth mode transition from mound formation to self-affine (semifractal) growth around 135 K.
The atomistic model quantitatively reproduced the experimental roughness data.

Conclusions:

The roughness evolution in Ag(100) homoepitaxy is highly complex and temperature-sensitive.
A specific temperature marks a transition in growth mechanisms, impacting film morphology.
An atomistic model successfully captures the underlying physics of this complex thin-film growth.