polymers

Joel Sarapas

Display Name

Sarapas, Joel

First Name

Joel

Middle Name/Initial

M

Last Name

Sarapas

Phone Number

(301) 975-4769

Email Address

CPR ID

214009

Staff Type

NIST Employee

Campus

Mailing Address

National Institute of Stds and Tech
100 Bureau Drive
Gaithersburg, MD 20899
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

01

Access Rights

Jochen Campo

Display Name

Jochen Campo

Staff Photo

First Name

Jochen

Last Name

Campo

Phone Number

(301) 975-6365

Email Address

CPR ID

209767

Staff Type

NIST Associate

Staff Bio

Jochen Campo is a Guest Researcher at the Material Measurement Laboratory of the National Institute of Standards and Technology (NIST). He performed his PhD at the University of Antwerp, Belgium, in the field of organic nonlinear optics (NLO). After his PhD, he was granted a postdoctoral fellowship of the Fund for Scientific Research of Flanders (FWO–Vlaanderen), during which he worked also in the group of J.W. Perry at Georgia Tech. Recently, he combined his NLO work with single-wall carbon nanotubes (SWCNTs), which brought him to NIST where he is now working in the Polymers and Complex Fluids Group with Jeffrey Fagan (funded by Matteo Pasquali's group at Rice University), on the upscaling, automation and further improvement of chirality-sorting of SWCNTs by aqueous two-phase extraction.

Selected non-NIST Publications

Asymmetric dyes align inside carbon nanotubes to yield a large nonlinear optical response
Sofie Cambré, Jochen Campo, Charlie Beirnaert, Christof Verlackt, Pegie Cool, Wim Wenseleers, Nature Nanotechnology 2015, 10: 248–252

First Hyperpolarizability Dispersion of the Octupolar Molecule Crystal Violet: Multiple Resonances and Vibrational and Solvation Effects
Jochen Campo, Anna Painelli, Francesca Terenziani, Tanguy Van Regemorter, David Beljonne, Etienne Goovaerts, and Wim Wenseleers, Journal of the American Chemical Society 2010, 132:16467–16478.

Highly sensitive setup for tunable wavelength hyper-Rayleigh scattering with parallel detection and calibration data for various solvents
Jochen Campo, Filip Desmet, Wim Wenseleers, and Etienne Goovaerts, Optics Express 2009, 17:4587-4604.

Accurate Determination and Modeling of the Dispersion of the First Hyperpolarizability of an Efficient Zwitterionic Nonlinear Optical Chromophoreby Tunable Wavelength Hyper-Rayleigh Scattering
Jochen Campo, Wim Wenseleers, Etienne Goovaerts, Marek Szablewski, and Graham Cross, Journal of Physical Chemistry C 2008, 112:287-296.

Staff Education

Ph.D., Physics, University of Antwerp, 2008

Staff Employment

2008–2014: Postdoctoral Fellow of the Fund for Scientific Research of Flanders, Belgium (FWO – Vlaanderen)

2010–2011: Postdoctoral researcher at the Georgia Institute of Technology, Atlanta, GA.

Campus

Mailing Address

100 Bureau Drive
Stop 8542
Gaithersburg, MD 20899-8542
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

1

Access Rights

Samim Ali

Display Name

Samim Ali

Staff Photo

First Name

Samim

Alternate First Name

Samim

Last Name

Ali

Alternate Last Name

Ali

Phone Number

(301) 975-6456

Email Address

CPR ID

210986

Staff Type

NIST Associate

Staff Bio

Research Interests


Soft matter physics, glass-gel transition, stability and rheology of colloidal suspensions, nonequilibrium phenomena, physicochemical behavior of clay mineral suspensions, polymers.

Experimental Skill


Oscillatory and rotational rheology, Ultrasound attenuation spectroscopy, Electroacoustics, Dynamic light scattering, Cryogenic scanning electron microscopy, Atomic force microscopy, Electrophoresis, Optical tweezer, High speed imaging.

Publications


Aggregation and stability of anisotropic charged clay colloids in aqueous medium in the presence of salt

Samim Ali, Ranjini Bandyopadhyay, Faraday Discuss., 2016, 186, 455-471.

Effect of electrolytes on the microstructure and yielding of aqueous dispersions of colloidal clay

Samim Ali, Ranjini Bandyopadhyay, Soft Matter, 2016, 12, 414-421.

Evaluation of the exfoliation and stability of Na-montmorillonite in aqueous dispersions

Samim Ali, Ranjini Bandyopadhyay, Applied Clay Science, 2015, 114, 85-92.

Use of ultrasound attenuation spectroscopy to determine the size distribution of clay tactoids in aqueous suspensions

Samim Ali, Ranjini Bandyopadhyay, Langmuir, 2013, 29, 12663-12669.

Staff Education

Raman Research Institute, Bangalore, India, PhD, 2016

Kalyani University, West Bengal, India, M.Sc. Condensed Matter Physcs, 2008

 

Staff Employment

Since 2016, Materials Measurement Laboratory

Campus

Mailing Address

100 Bureau Drive
Stop 8542
Gaithersburg, MD 20899-8542
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

1

Access Rights

Kevin Hinkle

Display Name

Hinkle, Kevin

Staff Photo

First Name

Kevin

Middle Name/Initial

R

Last Name

Hinkle

Phone Number

(301) 975-2895

Email Address

CPR ID

211878

Title/Position

NRC Postdoctoral Fellow

Staff Type

NIST Employee

Staff Bio

Current Research Interests

  • Thermodynamics of Single-Walled Carbon Nanotube/DNA Surfactant Complexes in Water
  • Contribution to the COMSOFT Workbench

Previous Research  Interests

  • Molecular Simulation of Membrane Transport
  • Thermodynamics of Ion Hydration
  • Nanotechnology

Selected Publications

Awards

Postdoctoral Fellowship, National Research Council - 2016

Department of Defense SMART Scholarship Semifinalist, 2012

Graduate Fellow at Ohio State University Center for Affordable Nanoengineering of Polymeric Biomedical Devices (OSU-CANPBD), 2010-2011

 

Staff Education

University of Illinois at Chicago, PhD, Chemical Engineering, 2016

Ohio State University, MS, Chemical and Biomolecular Engineering, 2011

University of Dayton, BS, Chemical and Materials Engineering, 2009

Staff Employment

NRC-NIST Postdoctoral Fellow, Materials Measurement Laboratory

Campus

Mailing Address

National Institute of Stds and Tech
100 Bureau Drive
Gaithersburg, MD 20899
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

01

Access Rights

Vamshi Gudapati

Display Name

Gudapati, Vamshi

First Name

Vamshi

Middle Name/Initial

Mohan

Last Name

Gudapati

Phone Number

(301) 975-8542

Email Address

CPR ID

212743

Staff Type

NIST Associate

Campus

Mailing Address

National Institute of Stds and Tech
100 Bureau Drive
Gaithersburg, MD 20899
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

01

Access Rights

Jhoan Santos Herrera

Display Name

Jhoan Santos Herrera

First Name

Jhoan

Last Name

Santos Herrera

Phone Number

(301) 975-6761

Email Address

CPR ID

211998

Staff Type

NIST Associate

Campus

Mailing Address

100 Bureau Drive
Stop 8542
Gaithersburg, MD 20899-8542
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

1

Access Rights

Celeste Balsam

Display Name

Balsam, Celeste

First Name

Celeste

Last Name

Balsam

Phone Number

(301) 975-8341

Email Address

CPR ID

210948

Title/Position

Office Manager

Staff Type

NIST Employee

Campus

Mailing Address

National Institute of Stds and Tech
100 Bureau Drive
Gaithersburg, MD 20899
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Materials Science and Engineering Division - HQ

Group Code

00

Access Rights

Alexandros Chremos

Display Name

Chremos, Alexandros

Staff Photo

First Name

Alexandros

Last Name

Chremos

Phone Number

(301) 975-5891

Email Address

CPR ID

208911

Title/Position

NIST Postdoctoral Research Associate

Staff Type

NIST Associate

Staff Bio

Research Interests

Polyelectrolytes and counter-ions

Synthetic and biological polymers (e.g., DNA and proteins) are challenging to model due to the formation of dynamic layers of associated water and counter-ion particles in the proximity of the polyelectrolyte. The dynamics of these polyelectrolytes are predominantly influenced by the associating species in these layers. This association phenomenon and the coupling to the polymer dynamics is poorly understood. Molecular dynamics of bead-spring model and an explicit solvent are used to develop quantitative metrologies for quantifying this complex interactions between the polyelectrolytes and these dynamic layers of associating particles.

Impact of Molecular Shape in Dense Polymeric Materials

We investigate the role of molecular shape in the thermodynamics and in the dynamics of dense fluids. Towards understanding the impact of molecular shape, ZENO is applied to compute shape related characteristics including the hydrodynamic radius and sphericity, and molecular dynamics simulations with a bead-spring model are used to investigate the thermodynamical and dynamical behavior of distinct molecular topologies such as linear chains, stars, and rings.

 

For a complete publication list see:

Google Scholar Profile

Staff Education

2005-2008 PhD, "Self-Assembly in Soft-Matter" University of Edinburgh, School of Chemistry.

2000-2004 BSc (Hons) Mathematical Physics University of Edinburgh, School of Physics.

Staff Employment

2012 – 2014 Postdoctoral research associate Imperial College, Department of Chemical Engineering, Centre for Process Systems Engineering.

2009-2012 Postdoctoral research associate Princeton University, Chemical and Biological Engineering and Princeton Institute for the Science and Technology of Materials.

Campus

Mailing Address

National Institute of Stds and Tech
100 Bureau Drive
Gaithersburg, MD 20899
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

01

Selected Publications

When does a branched polymer becomes a particle?
Influence of Higher Valence Ions on Flexible Polyelectrolytes Stiffness and Counter-ion Distribution
Counter-ion distribution around flexible polyelectrolytes having different molecular architecture

Access Rights

Cavan Kalonia

Display Name

Kalonia, Cavan

First Name

Cavan

Middle Name/Initial

Kumar

Last Name

Kalonia

Phone Number

(301) 975-6847

Email Address

CPR ID

211811

Staff Type

NIST Employee

Campus

Mailing Address

National Institute of Stds and Tech
100 Bureau Drive
Gaithersburg, MD 20899
United States

Mail Stop

8542

Organizational Unit

Division Name

Materials Science and Engineering Division

Division Code

642

Group Name

Polymers and Complex Fluids Group

Group Code

01

Access Rights

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