Journal articleCBE Life Sci Educ · June 2022
Science, technology, engineering, and mathematics (STEM) career barriers persist for individuals from marginalized communities due to financial and educational inequality, unconscious bias, and other disadvantaging factors. To evaluate differences in plans ...
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Journal articleBritish Journal of Educational Technology · May 1, 2021
Goal setting is an important component in successful teaching and learning, but relatively little is known about its impact on course persistence and achievement in massive open online courses. Using an experimental design and employing a variety of data i ...
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Journal articleAmerican Journal of Distance Education · October 2, 2019
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Most Massive Open Online Courses (MOOC) research studies have focused on students’ demographics, surveys, and retention data, while little attention has been paid to the authentic voices of the learners: the expressions of experiences, perceptions, and emo ...
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Journal articleACS Symposium Series · January 1, 2019
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A brief review of recent literature describing cooperative learning in organic chemistry, and the use of POGIL in particular, is presented. A case study of the steps one instructor took to implement the POGIL pedagogy will be outlined along with instructor ...
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Journal articleComputers and Education · July 1, 2017
During the widespread development of open access online course materials in the last two decades, advances have been made in understanding the impact of instructional design on quantitative outcomes. Much less is known about the experiences of learners tha ...
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Journal articleChemistry Education Research and Practice · January 1, 2017
Science and engineering educators and employers agree that students should graduate from college with expertise in their major subject area as well as the skills and competencies necessary for productive participation in diverse work environments. These co ...
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Journal articleJournal of Chemical Education · January 14, 2014
How can colleges and universities keep an open gateway to the science disciplines for the least experienced first-year science students while also maintaining high standards that challenge the students with the strongest possible high school backgrounds? T ...
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Journal articleWiley interdisciplinary reviews. Nanomedicine and nanobiotechnology · July 2009
This review discusses rational design of particles for use as therapeutic vectors and diagnostic imaging agent carriers. The emerging importance of both particle size and shape is considered, and the adaptation and modification of soft lithography methods ...
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Journal articleJournal of Applied Polymer Science · October 24, 2002
We describe our investigations of the curing chemistry and properties of heat-resistant thermosets comprised of unsaturated ester resins. We suggest a mechanism for the rearrangement of the cured matrix and volatile evolution during the curing process. We ...
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Journal articleNeutron News · January 1, 1999
Above its critical point, carbon dioxide forms a supercritical (SC) solvent which promises to be an environmentally responsible replacement for the organic solvents currently used in polymer synthesis and processing. CO2–soluble molecules (e.g. ...
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Journal articleLangmuir · November 24, 1998
The reduction of the interfacial tension at the polystyrene (PS, Mn = 1850)-supercritical CO2 interface is reported for poly(1,1-dihydroperfluorooctyl acrylate) (PFOA) and the block copolymers PS-b-PFOA (3.7K/ 27K) and PS-b-poly(dimet ...
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Journal articleMacromolecules · September 22, 1997
Herein we report the use of poly(styrene-b-dimethylsiloxane) block copolymers as steric stabilizers for dispersion polymerizations of styrene in a carbon dioxide continuous phase. It was demonstrated that the anchor-soluble balance (ASB) of the stabilizer ...
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Journal articleMacromolecules · August 25, 1997
The stabilization and flocculation of emulsions of poly(2-ethylhexyl acrylate) (PEHA) in liquid and supercritical carbon dioxide (SC-CO2) with the homopolymer poly(1,1-dihydroperfluorooctyl acrylate) (PFOA), the diblock copolymer polystyrene-b-P ...
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Journal articleMacromolecules · August 25, 1997
Dynamic light scattering (DLS) was used to investigate steric stabilization and flocculation of dilute poly(2-ethylhexyl acrylate) (PEHA, Mw = 92K) emulsions in liquid CO2 at 25 °C by monitoring changes in droplet size over time at va ...
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Journal articleAdvances in Polymer Science · 1997
In the past few years, remarkable progress has been made in defining the scope and limitations of carbon dioxide (CO2) as an inert polymerization medium. It has appear that CO2 represents a viable solvent choice for a variety of propagation mechanisms incl ...
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Journal articleJournal of Applied Crystallography · January 1, 1997
Above its critical point, carbon dioxide forms a supercritical fluid, which promises to be an environmentally responsible replacement for the organic solvents traditionally used in polymerizations. Many lipophilic polymers such as polystyrene (PS) are inso ...
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Journal articleScience (New York, N.Y.) · December 1996
Interfacially active block copolymer amphiphiles have been synthesized and their self-assembly into micelles in supercritical carbon dioxide (CO2) has been demonstrated with small-angle neutron scattering (SANS). These materials establish the design criter ...
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Journal articleJournal of Molecular Structure · September 30, 1996
Superficial fluids (SCF) are becoming an attractive alternative to the liquid solvents traditionally used as polymerization media [1]. As the synthesis proceeds, a wide range of colloidal aggregates form, but there has hitherto been no way to measure such ...
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Journal articleMacromolecules · April 8, 1996
The dispersion polymerization of styrene in supercritical CO2 using amphiphilic diblock copolymers to impart steric stabilization was investigated. Lipophilic, CO2-insoluble materials can be effectively emulsified in carbon dioxide us ...
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Journal articleMacromolecules · March 1, 1996
A commercially available PDMS (poly(dimethylsiloxane)) macronomer has been used to stabilize the dispersion polymerization of MMA (methyl methacrylate) in liquid and supercritical CO2 and of styrene in supercritical CO2. Purification ...
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