Steven R. Kline

National Institute of Standards and Technology

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Harshita Kumari

University of Cincinnati

Jerry L. Atwood

University of Missouri

Sung‐Min Choi

Korea Advanced Institute of Science and Technology

Andrew V. Mossine

University of Missouri

Changwoo Do

Oak Ridge National Laboratory

Drew A. Fowler

Portland VA Medical Center

Carol A. Deakyne

University of Missouri

Boualem Hammouda

NIST Center for Neutron Research

Tae‐Hwan Kim

Pohang University of Science and Technology

R. M. Dimeo

National Institute of Standards and Technology

Cooperative Institutions

National Institute of Standards and Technology

NIST Center for Neutron Research

National Institute of Standards

University of Delaware

University of Missouri

Oak Ridge National Laboratory

Lawrence Berkeley National Laboratory

Cornell University

Johns Hopkins University

North Carolina State University

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Robotic Thin Layer Chromatography Instrument for Synthetic Chemistry

Springer eBooks (1991)

L. Andrew Corkan Evan Haynes Steven R. Kline Jonathan S. Lindsey

Workstation

Laboratory automation

Sample (material)

10.1007/978-1-4899-0626-7_33

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Citations (7)

Aggregation of Colloidal Silica by n-Alkyl Sulfates

Langmuir (1996)

Steven R. Kline Eric W. Kaler

The coagulation behavior of aqueous colloidal silica (Ludox TM) in the presence of a homologous series of n-alkyl sulfates has been studied. Coagulation concentrations were measured for a simple salt, NaCl, and electrolyte/surfactants NaCnSO4 with chain lengths n = 1, 2, 6, 8, 10, or 12 carbons. The C6 and shorter homologues had coagulation concentrations equivalent to that of NaCl, while C8 and higher homologues had coagulation concentrations at lower ionic strengths. Calculations of the Ludox−Ludox interaction potential show that the coagulation concentration results are consistent with the action of a screened repulsion plus a depletion attraction induced by the presence of surfactant micelles. Small angle neutron scattering measurements were made of mixtures with sodium dodecyl sulfate (SDS) under contrast-match conditions that isolated the silica−silica interactions. The silica−silica interactions indeed progressed from repulsive to attractive as more SDS micelles were added, a trend consistent with the observed aggregation. Silica in the presence of NaCl with an ionic strength equivalent to that of 0.40 M SDS showed hard sphere interactions, whereas the sample containing SDS micelles showed strong long-range attractive interactions. Thus we show how solvent microstructure influences the stability of a colloidal dispersion.

Colloidal Silica

Sodium dodecyl sulfate

10.1021/la950716l

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Citations (26)

CCDC 1412542: Experimental Crystal Structure Determination

The Cambridge Structural Database (2015)

Harshita Kumari Sarah E. Armitage Steven R. Kline Krishna K. Damodaran Stuart R. Kennedy

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc1jdvwn

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Citations (0)

Ferrocene Species Included within a Pyrogallol[4]arene Tube

Chemistry - A European Journal (2012)

Andrew V. Mossine Harshita Kumari Drew A. Fowler A. Shih Steven R. Kline

Tubes versus spheres: A new inclusion complex of alkylpyrogallol[4]arene and ferrocene is described. Unlike the previously reported dimer, the tubular motif shown is not stable in methanolic solution and dissociates into a dimer. Its formation is thus likely due to a high alkylpyrogallol[4]arene/ferrocene ratio coupled with shifting solvent conditions during evaporation. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Pyrogallol

10.1002/chem.201200263

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Citations (38)

The Formation of an Irreversibly Adsorbed and Organized Micelle Layer at the Solid−Liquid Interface

Nano Letters (2002)

Simon Biggs Lynn M. Walker Steven R. Kline

Rod-like aggregates formed from polymerized surfactant systems form organized two-dimensional layers at the solid-liquid interface. These layers are self-organized during the adsorption of the complexes at the solid surface. In common with layers formed from simple surfactants, the adsorbed layer structures show a high degree of ordering at the nanometer to micron length scales. Unlike their simple surfactant analogues, the layers formed using the polymerized surfactant systems are irreversibly adsorbed and are not sensitive to subtle interactions between the substrate and surfactant molecules. This allows for a wide range of processing options for these nanoorganized films.

Solid surface

Interface (matter)

10.1021/nl025715+

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Citations (20)

Interactions in Colloidal Mixtures: Partial Structure Factors in Mixtures of Colloidal Silica and an Anionic Oil-in-Water Microemulsion

Journal of Colloid and Interface Science (1998)

Steven R. Kline Eric W. Kaler

Microemulsion

Decane

Colloidal Silica

10.1006/jcis.1998.5543

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Citations (23)

2023 NIST Center for Neutron Research Accomplishments and Opportunities

James M. Adams Steven R. Kline

NIST

Center (category theory)

Research center

10.6028/nist.sp.1294

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Citations (4)

Small angle neutron scattering near Lifshitz lines: Transition from weakly structured mixtures to microemulsions

The Journal of Chemical Physics (1994)

K. V. Schubert R. Strey Steven R. Kline E. W. Kaler

We have studied the phase behavior, wetting transitions, and small angle neutron scattering (SANS) of water, n-alkane, and n-alkyl polyglycol ether (CiEj) systems in order to locate the transition between weakly structured mixtures and microemulsions, and to provide a measure for the transition. We first determined the wetting transition by macroscopic measurements and then measured the location of the Lifshitz lines by SANS. Starting with well-structured mixtures (exhibiting nonwetting middle phases and well-expressed scattering peaks, features that qualify them as microemulsions) the wetting transition was induced by increasing the chain length of the alkane or by changing the oil/water volume ratio, and then the Lifshitz line was crossed. Further, starting with systems past the disorder line (weakly structured mixtures that display wetting middle phases and no scattering peaks), local structure was induced by either increasing the surfactant concentration or decreasing the oil/water volume ratio or the temperature. In each case a Lifshitz line was crossed. Analyzing the scattering experiments quantitatively, allows determination of the amphiphilicity factor, which is a measure of the strength of the surfactant. The results suggest there is a sequence of roughly parallel surfaces within the three-dimensional composition-temperature space. As the amphiphilicity factor increases, first a disorder surface is encountered, then a Lifshitz surface, and finally a wetting transition surface. How and to what extent these surfaces move in the one-phase region toward smaller surfactant concentrations, and intersect there with the body of heterogeneous phases, depends on a number of factors that are discussed in some detail.

Microemulsion

Wetting transition

Small-Angle Scattering

Structure factor

Alkane

10.1063/1.467387

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Citations (198)

The Structure and Dynamics of Silk and Cellulose Dissolved in Ionic Liquids

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2008)

Paul C. Trulove W.M. Reichert H. De Long Steven R. Kline Sameer S. Rahatekar

Abstract not Available.

Dynamics

10.1149/ma2008-02/49/2976

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Citations (1)

Charged Rod‐Like Nanoparticles Assisting Single‐Walled Carbon Nanotube Dispersion in Water

Advanced Functional Materials (2008)

Changwoo Do Sung‐Min Choi Steven R. Kline Hyung‐Sik Jang Tae‐Hwan Kim

Abstract A new dispersant for stabilization of single wall carbon nanotubes (SWNTs) in water that simultaneously utilizes three different dispersion or stabilization mechanisms: surfactant adsorption, polymeric wrapping, and Coulomb repulsive interaction, has been demonstrated. The new dispersant, a charged rod‐like nanoparticle (cROD), is a cylindrical micelle wrapped by negatively charged polymers which is fabricated by the aqueous free radical polymerization of a polymerizable cationic surfactant, cetyltrimethylammonium 4‐vinylbenzoate (CTVB), in the presence of sodium 4‐styrenesulfonate (NaSS). The surface charge density of the cRODs is controlled by varying the concentration of NaSS. Dispersions of SWNTs are obtained by sonicating a mixture of SWNTs and cROD in water, followed by ultra‐centrifugation and decanting. While the cRODs with neutral or low surface change densities (0 and 5 mol % NaSS) result in very low dispersion power and poor stability, the cRODs with high surface charge densities (15, 25, and 40 mol % NaSS) produce excellent dispersions with SWNT concentration as high as 437 mg L −1 and long term stability. The sharp van Hove transition peaks of the cROD assisted SWNT dispersions indicate the presence of individually isolated SWNTs. Atomic force microscopy and small angle neutron scattering analysis show that the dominant encapsulation structure of the cROD assisted SWNTs is surfactant assisted polymeric wrapping. SWNTs dispersed by the cRODs can be fully dried and easily re‐dispersed in water, providing enhanced processibility of SWNTs.

Dispersion stability

Surface charge

10.1002/adfm.200800321

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Citations (33)