Chemical control of thermal expansion in zeolites with the LTA topology

Zeolites are microporous materials that have been commonly shown to exhibit remarkable negative thermal expansion (NTE) behaviour in their purely siliceous forms, with reported thermal expansion coefficients ranging from −3 x 10–$_6$ K–$_1$ to −26.1 x 10–$_6$ K–$_1$. In contrast, very little research has been reported on the aluminium-containing structures which are widely used for various commercial applications. Compounds exhibiting this property, which has only been observed in a small number of solids, are of considerable technological interest as their inclusion in devices or composite materials can counterbalance the more usual expansion on heating and contraction on cooling, thereby reducing the incidence of thermally induced failures. Here, we report an investigation into the effect that changing the chemical composition of the zeolite framework and intrapore species has on thermal expansion properties of zeolites with the LTA topology. Variable-temperature powder X−ray diffraction studies were used to determine the thermal expansion coefficients of the chemically modified zeolites over a sub-ambient temperature range and investigate the structural basis behind their thermal behaviour. Dramatic changes in the thermal expansion behaviour (from strong negative to weak positive) of the zeolites were observed as the structures were modified through ion-exchange, dehydration, varying the Al content in the framework and loading the pores with silver nitrate. The zeolitic pores contents have been shown to play a key role in the manner in which LTA-zeolites react to temperature variation, especially in the case of intra-porous water molecules. Detailed atomistic structural mechanisms behind the observed NTE behaviour have been produced for the more simplistic systems. Several key breakthroughs have also been achieved in understanding the formation of the superlattice when silver nitrate is incorporated into the zeolite pores and with regards to solving the unit cell structure

Letter, n.d., from Thomas Carey to Friends and Alumni

1 page, Carey was the Artistic Director for th Cimarron Circuit Opera Company. This is an open letter

Last Will and Testament of M. Carey Thomas

The complete will of the first Dean and second President of Bryn Mawr College, M. Carey Thomas.https://repository.brynmawr.edu/bmc_books/1021/thumbnail.jp

The design of the southern future: The struggle to build white democracy at the University of Mississippi, 1890-1948

This dissertation examines how ideas about the future and the past shaped the meaning and role of Mississippi’s flagship state university during the Jim Crow period. “The Design of the Southern Future” is a story of contingency and contestation, of struggles over expansion and democratization, and of the burdens of founding myths and myths of the founding. It reveals the interior dynamics that shaped the University of Mississippi’s development from the birth of Jim Crow until just before the desegregation crises of the 1950s and 1960s. These internal processes allothe institution to overcome problems of exclusivity and class tension, but they also tied the future and identity of the university closely to the cause of white supremacy and segregation. By examining the building of the University of Mississippi as an element of an ambitious program to combine the promise of a white majoritarian future with the permanent exclusion of African Americans, “The Design of the Southern Future” treats the erection of a segregationist institution as a project in equipping Jim Crow for the long-haul by expanding and modernizing the services and possibilities that a dynamic form of white supremacy seemed to offer. By the 1940s, the University of Mississippi had succeeded in mending its internal divisions and harnessing the power and resources of the federal government to build itself into a laboratory for white democracy. Thus when African Americans challenged segregation at the university in the 1950s and 1960s, defenders of Ole Miss were not merely protecting a citadel of Jim Crow; they were fighting to promote future visions of white supremacy

Guest Artist Recital: Thomas Carey, Baritone; May 24, 1972

Centennial East Recital HallWednesday EveningMay 24, 19728:15 p.m

In Memory of Walter Cope, Architect of Bryn Mawr College

Address delivered by President M. Carey Thomas at a Memorial Service held at Bryn Mawr College, November 4, 1902. Published in the Bryn Mawr College Lantern, February, 1905.https://repository.brynmawr.edu/bmc_books/1004/thumbnail.jp

Review of the Nieman Foundation with special reference to the report of the committee to review the Nieman Foundation

Thesis (M.S.)--Boston University, 195

VA Accountability Act of 2015 (H.R. 1994), as Reported to the House

[Excerpt] This report describes the VA Accountability Act of 2015 (H.R. 1994) as reported to the House by the Committee on Veterans Affairs on July 23 2015 and compares it to current law where appropriate. A press account has reported that Chairman Jeff Miller may meet with all committee members to seek views of the minority before floor action. As a result of this meeting, it is possible that the final bill that will go to the House floor may have some provisions that differ from those that the Committee reported. This report provides a section-by-section description of the act

Gold Nanoparticle Cytotoxicity

The industry of nanotechnology is growing faster than the understanding of nanoparticle’s long term health and environmental effects, which has brought about research regarding nanoparticle cytotoxicity. Our research focused on studying interactions between supported lipid bilayers with varying sized bare unconjugated gold nanoparticles. The interactions were monitored on an instrument, known as a Quartz crystal microbalance. From the results, size wasn’t a variable that governed how the bare gold nanoparticles affected the membrane. A major factor in the results was the lack of reproducibility. The existence of defects during the formation of the SLB is in itself a variable in the experiment and will need to be treated thusly in future nanoparticle-lipid bilayer research