**Alan R. Denton**, Associate Professor

M.Sc., Physics, University of Toronto, 1984

B.A.Sc., Engineering Science, University of Toronto, 1983

**Postal Address:**

North Dakota State University

P.O. Box 6050, Dept. 2755

Fargo, ND 58108-6050

U.S.A.

**Office:**

Tel: (701) 231-7036 Fax: (701) 231-7088

E-mail: alan.denton [at] ndsu [dot] edu

**RESEARCH FUNDING:**
National Science Foundation,
DMR-1106331,
DMR-0204020;
ND-EPSCoR;
ACS Petroleum Research Fund.

**GRADUATE RESEARCH OPPORTUNITIES:**
Apply with the Graduate School.

**UNDERGRADUATE RESEARCH OPPORTUNITIES:**

Students interested in research, please talk with me!

**TEACHING**

Spring 2014: PHYS 758 -- Statistical Physics (syllabus)

Fall 2013: PHYS 752 -- Mathematical Methods I (syllabus)

Spring 2013: PHYS 463/663 -- Statistical Mechanics (syllabus)

Fall 2012: PHYS 252 -- University Physics II (syllabus)

Spring 2012: PHYS 370 -- Computational Physics (syllabus)

Fall 2011: PHYS 485/685 -- Quantum Mechanics I (syllabus)

Spring 2011: PHYS 782 -- Condensed Matter Physics (syllabus) (co-taught with Daniel Kroll)

Fall 2010: MNT 756 -- Molecular Modeling of Materials (syllabus)

Spring 2010: PHYS 370 -- Computational Physics (syllabus)

Fall 2009: PHYS 485/685 -- Quantum Mechanics I (syllabus)

Spring 2009: PHYS 752 -- Mathematical Methods in Physics (syllabus)

Fall 2008: PHYS 370 -- Computational Physics (syllabus), PHYS 252 -- University Physics II

Spring 2008: PHYS 251R -- University Physics I Recitation (team taught) (syllabus)

Fall 2007: PHYS 485 -- Quantum Mechanics I (syllabus)

Spring 2007: PHYS 782 -- Condensed Matter Physics (syllabus)

Fall 2006: PHYS 251 -- University Physics I (syllabus)

Spring 2006: PHYS 485 -- Quantum Mechanics I (syllabus)

Fall 2005: PHYS 758 -- Statistical Physics (syllabus)

Spring 2005: PHYS 782 -- Solid State Physics II (syllabus

Fall 2004: PHYS 361 -- Electromagnetic Theory (syllabus)

Spring 2003: PHYS 758 -- Statistical Physics (syllabus)

Fall 2002: PHYS 252 -- University Physics II

Spring 2002: PHYS 110 -- Introductory Astronomy

Fall 2001: PHYS 252 -- University Physics II

Spring 2001: PHYS 110 -- Introductory Astronomy

Fall 2000: PHYS 753 -- Mathematical Methods in Physics II

**Animations** (coded in Java by Anne Denton):

Faraday's Law Applet

**RESEARCH INTERESTS**

My current interests center on interparticle interactions, microscopic structure, and macroscopic properties of condensed matter. Systems of interest are primarily soft materials: colloidal suspensions (paints, inks, clays), polymers (rubbers, plastics), and surfactants (soaps, detergents), I have also been known to dabble in metals, quasicrystals, and quantum fluids. Statistical mechanical and computer simulation methods are used to model effective interactions and predict structure and phase transitions.

**Current Projects**

- Poisson-Boltzmann Modeling of Ion Distributions in Solutions of Polyelectrolyte Microcapsules (with Qiyun Tang, Andrew Croll, and Damith Rozairo)

- Monte Carlo Simulations of Polymer Crowding in Polymer-Nanoparticle Mixtures (with Wei Kang Lim)

- Monte Carlo Simulations of Lattice Models of Mixtures (with Wei Kang Lim)

- Molecular Dynamics Simulations of Ionic Microgel Solutions (with Mary Hedrick)

- Charge Renormalization Theory of Colloidal Mixtures (with Jun Kyung Chung)

- Effective Interactions in Polyelectrolyte Solutions

- Colloid-Polymer Mixtures: Demixing and confinement-induced fluctuations in polymer conformation (with Emmanuel Mbamala and Sylvio May).

- Two-Dimensional Dipolar Colloidal Crystals (with Ben Lu): animation

**GROUP MEMBERS**

Wei Kang (Ken) Lim is an undergraduate student developing Monte Carlo simulations to model demixing of binary alloys and crowding in polymer-nanoparticle mixtures.

Mary Hedrick is is an undergraduate student applying molecular dynamics simulation (LAMMPS) to model structural and thermodynamic properties of ionic microgel solutions.

**Alum Club:**

Michael P. Schmidt (graduated 2011) has developed Monte Carlo simulations to model demixing of colloid-polymer mixtures.

Dr. Emmanuel Mbamala (former postdoctoral fellow) is now Assistant Professor, Department of Physics, Federal University of Technology, P.M.B. 1526 Owerri, Nigeria.

Dr. Hao Wang (former postdoctoral fellow) is now Assistant Professor, College of Pharmacy, Nankai University, Tianjin, China.

Magnetic levitation (photographer: Hao Wang). Is it magic or physics?

Co-organizer of CECAM Workshop on "Effective Interactions and Phase Transitions in Colloidal Suspensions," June 28-30, 1999, Lyon, France.

**PUBLICATIONS**

Qiyun Tang and Alan R. Denton, "Ion density deviations in polyelectrolyte microcapsules: influence on biosensors," *Phys. Chem. Chem. Phys.* **16**, 20924-20931 (2014).

Wei Kang Lim and Alan R. Denton, "Polymer Crowding and Shape Distributions in Polymer-Nanoparticle Mixtures,"
*J. Chem. Phys.* **141**, 114909-1-10 (2014).

A. R. Denton, "Crowding in Polymer-Nanoparticle Mixtures," in *New Models of
the Cell Nucleus: Crowding, Entropic Forces, Phase Separation, and Fractals*, R. Hancock and K. W. Jeon, Eds., International Review of Cell and Molecular Biology **307**, pp. 27-72 (UK: Academic Press, 2014). Elsevier's copyright policy prevents me from posting this article online.
reprint request

A. R. Denton, "Coarse-Grained Modeling of Charged Colloidal Suspensions:
From Poisson-Boltzmann Theory to Effective Interactions," in
* Electrostatics of Soft and Disordered Matter*, D. S. Dean, J. Dobnikar,
A. Naji, and R. Podgornik, Eds., Proceedings of the CECAM Workshop
"New Challenges in Electrostatics of Soft and Disordered Matter" (Pan Stanford, 2014).
cond-mat

J. B. Miller, A. C. P. Usselman, R. J. Anthony, U. R. Kortshagen, A. J. Wagner, A. R. Denton, and E. K. Hobbie, "Phase separation and the 'coffee-ring' effect in polymer-nanocrystal mixtures," * Soft Matter* **10**, 1665-1675 (2014).
article

J. K. Chung and A. R. Denton, "Effective electrostatic interactions in mixtures of charged colloids," * Phys. Rev.* E **88**, 022306-1-9 (2013).
cond-mat

A. R. Denton and M. P. Schmidt, "Exploring Fluctuations and Phase Equilibria
in Fluid Mixtures via Monte Carlo Simulation," *Eur. J. Phys.* **34**, 475-487 (2013).
cond-mat

Ben Lu and Alan R. Denton, "Crowding of polymer coils and demixing
in nanoparticle-polymer mixtures," *J. Phys.: Condens. Matter* **23**, 285102-1-9 (2011).
cond-mat

A. R. Denton, "Poisson-Boltzmann Theory of Charged Colloids: Limits of the Cell Model for
Salty Suspensions," *J. Phys.: Condens. Matter* **22**, 364108-1-12 (2010).
cond-mat

B. Lu and A. R. Denton, "Charge Renormalization, Thermodynamics, and Structure of
Deionized Colloidal Suspensions," *Communications in Computational Physics* **7**,
235-249 (2010).
Special Issue on Structure Formation and Evolution in Soft Matter/Complex Fluid Systems.
cond-mat

A. R. Denton, "Charge Renormalization, Effective Interactions, and Thermodynamics of Deionized Colloidal Suspensions," *J. Phys.: Condens. Matter* **20**, 494230-1-8 (2008).
cond-mat

A. R. Denton, "Effective Interactions in Soft Materials," in
* Nanostructured Soft Matter: Experiment, Theory, Simulation and Perspectives*,
A. V. Zvelindovsky, Ed., pp. 395-433 (Springer, Dordrecht, 2007).
reprint
cond-mat

A. R. Denton, "Electroneutrality and Phase Behavior of
Colloidal Suspensions," *Phys. Rev.* E **76 **, 051401 (2007).
cond-mat

Ben Lu and Alan R. Denton, "Phase Separation of Charge-Stabilized Colloids:
A Gibbs Ensemble Monte Carlo Simulation Study," *Phys. Rev.* E **75
**, 061403-1-10 (2007).
cond-mat

A. R. Denton, "Phase Separation in Charge-Stabilized Colloidal
Suspensions: Influence of Nonlinear Screening,"
*Phys. Rev. * E **73**, 041407-1-14 (2006).
cond-mat

Hao Wang and Alan R. Denton, "Effective Electrostatic Interactions
in Solutions of Polyelectrolyte Stars with Rigid Rodlike Arms,"
*J. Chem. Phys.* **123**, 244901-1-9 (2005).
cond-mat

Alan R. Denton and Matthias Schmidt, "Mixtures of Charged Colloid
and Neutral Polymer: Influence of Electrostatic Interactions on Demixing and
Interfacial Tension," *J. Chem. Phys.* **122**, 2449111-1-7 (2005).
cond-mat

H. Wang and A. R. Denton, "Effective Electrostatic Interactions
in Suspensions of Polyelectrolyte Brush-Coated Colloids,"
*Phys. Rev. * E **70**, 041404-1-8 (2004).
cond-mat

A. R. Denton, "Nonlinear Screening and Effective Electrostatic
Interactions in Charge-Stabilized Colloidal Suspensions,"
*Phys. Rev. * E **70**, 031404-1-18 (2004).
cond-mat (long)
cond-mat (short)

A. R. Denton, "Counterion Penetration and Effective Electrostatic
Interactions in Solutions of Polyelectrolyte Stars and Microgels,
" *Phys. Rev.* E **67**, 011804-1-10 (2003).
reprint

M. Schmidt, A. R. Denton, and J. M. Brader, "Fluid Demixing in
Colloid-Polymer Mixtures: Influence of Polymer Interactions, "
*J. Chem. Phys.* **118**, 1541-1549 (2003).
reprint

A. R. Denton and M. Schmidt, "Colloid-Induced Polymer Compression,
" *J. Phys.: Condens. Matter* **14**, 12051-12062 (2002).
cond-mat

M. Schmidt and A. R. Denton, "Demixing of Colloid-Polymer Mixtures
in Poor Solvents," *Phys. Rev.* E **65**, 061410-1-6 (2002).
cond-mat

M. Schmidt and A. R. Denton, "Colloids, Polymers, and Needles:
Demixing Phase Behavior," *Phys. Rev.* E **65**, 021508-1-8 (2002).
cond-mat

A. R. Denton, "Effective Interactions and Volume Energies in Charged
Colloids: Linear Response Theory," *Phys. Rev.* E **62**,
3855-3864 (2000).
cond-mat

J. Roth and A. R. Denton, "Solid-Phase Structures of the Dzugutov Pair Potential,
" *Phys. Rev.* E **61**, 6845-6857 (2000).
cond-mat

H. Löwen, M. Watzlawek, C. N. Likos, M. Schmidt, A. Jusufi, A. R. Denton,
"Phase transitions in colloidal suspensions and star polymer solutions,"
*J. Phys.: Condensed Matter* **12**, A465-469 (2000).

A. R. Denton, "Effective Interactions and Volume Energies in Charge-Stabilized
Colloidal Suspensions," *J. Phys.: Condens. Matter* **11**,
10061-10071 (1999).
cond-mat

A. R. Denton, G. Kahl, and J. Hafner, "Freezing of Simple Liquid Metals,"
*J. Non-Crystalline Solids* **250-252**, 15 (1999).
cond-mat

A. R. Denton and H. Löwen, "Stability of Colloidal
Quasicrystals," *Phys. Rev. Lett.* **81**, 469-472 (1998).
cond-mat

A. R. Denton and H. Löwen, "Unusual Phase Behaviour from Peculiar
Pair Potentials," *Prog. Coll. Int. Sci.* **104**, 160 (1997)
[Proceedings of the International Workshop on Optical Methods and the Physics
of Colloidal Dispersions, 30.9 -- 1.10.1996, Mainz, Germany]

A. R. Denton and H. Löwen, "Isostructural Solid-Solid Transitions
in Square-Shoulder Systems," *J. Phys.: Condens. Matt.* **9**,
L1 (1997).

A. R. Denton and H. Löwen, "Influence of Short-Range Attractive
and Repulsive Interactions on the Phase Behaviour of Model Colloidal
Suspensions,"
*J. Phys.: Condens*. *Matt*. **9**, 8907 (1997).

A. R. Denton and J. Hafner, "Thermodynamically Stable One-Component Metallic Quasicrystals," *Europhys. Lett.* **38**, 189 (1997).
cond-mat

A. R. Denton and J. Hafner, "Thermodynamically Stable One-Component Quasicrystals: A Density-Functional Survey of Relative Stabilities," *Phys. Rev.* B **56**, 2469 (1997).
cond-mat

A. R. Denton, P. Nielaba, and N. W. Ashcroft, "Density-Functional Theory of Quantum Freezing: Sensitivity to Liquid-State Structure and Statistics," *J. Phys.: Condens. Matt. ***9**, 4061 (1997).
cond-mat

A. R. Denton and P. A. Egelstaff, "Implicit Finite-Size Effects in Computer Simulations," *Z. Phys*. B **103**, 343 (1997).
cond-mat

J. J. Salacuse, A. R. Denton, and P. A. Egelstaff, "Finite-Size Effects in Molecular Dynamics Simulations: Static Structure Factor and Compressibility I. Theoretical Method," *Phys. Rev*. E **53**, 2382 (1996).

J. J. Salacuse, A. R. Denton, P. A. Egelstaff, M. Tau, and L. Reatto, "Finite-Size Effects in Molecular Dynamics Simulations: Static Structure Factor and Compressibility II. Application to a Model Krypton Fluid," *Phys. Rev.* E **53**, 2390 (1996).

A. R. Denton, N. W. Ashcroft, and W. A. Curtin, "Density-Functional Approach to the Equation of State of a Hard-Sphere Crystal," *Phys. Rev.* E **51**, 65 (1995).

A. R. Denton, C. G. Gray, and D. E. Sullivan, "Orientational Ordering of Surfactant Monolayers Adsorbed at the Air-Water Interface: Structural Model and Fit to Neutron Reflectivity Data," *Chem. Phys. Lett.* **219**, 310-318 (1994).

A. R. Denton and N. W. Ashcroft, "Weighted-Density-Functional Theory of
Nonuniform Fluid Mixtures: Application to the Structure of Binary Hard-Sphere
Mixtures Near a Hard Wall," *Phys. Rev.* A **44**, 8242-8248 (1991).

A. R. Denton and N. W. Ashcroft, "Density-Functional Approach to the Structure
of Classical Uniform Fluids," *Phys. Rev.* A **44**, 1219-1227 (1991).

A. R. Denton, N. W. Ashcroft, "Vegard's Law," *Phys. Rev.* A
**43**, 3161-3164 (1991).

A. R. Denton, P. Nielaba, K. J. Runge and N. W. Ashcroft, "Freezing of
a Quantum Hard-Sphere Liquid at Zero Temperature: A Density-Functional
Approach," *J. Phys.: Condens. Matter* **3**, 593-607 (1991).

A. R. Denton and N. W. Ashcroft, "Weighted-Density-Functional Theory of
Nonuniform Fluid Mixtures: Application to Freezing of Binary Hard-Sphere
Mixtures," *Phys. Rev.* A **42**, 7312-7329 (1990).

A. R. Denton, P. Nielaba, K. J. Runge, N. W. Ashcroft, "Freezing of
a Quantum Hard-Sphere Liquid at Zero Temperature: A Density-Functional
Approach," *Phys. Rev. Lett.* **64**, 1529-1532 (1990).

A. R. Denton and N. W. Ashcroft, "Reply to Comment on 'Modified
Weighted-Density-Functional Theory of Nonuniform Classical Liquids',"
*Phys. Rev.* A **41**, 2224-2226 (1990).

A. R. Denton and N. W. Ashcroft, "Modified Weighted-Density-Functional
Theory of Nonuniform Classical Liquids," *Phys. Rev.* A **39**,
4701-4708 (1989).

A. R. Denton and N. W. Ashcroft, "High-Order Direct Correlation Functions
of Uniform Classical Liquids," *Phys. Rev.* A **39**, 426-429 (1989).

R. C. Desai and A. R. Denton, "Fractal Properties of Clusters During
Spinodal Decomposition," in *On Growth and Form*, ed. H. E. Stanley,
N. Ostrowsky, pp. 237-243 (Martinus Nijhoff, Dordrecht, 1986).

Old Seminars (2000-2008))

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Last modified 10 October 2014 by Alan Denton

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