Emily Aston (1866–1948): A Pioneer of Precision in the Golden Age of Chemistry
Emily Aston was a formidable figure in the late 19th and early 20th-century chemical sciences. At a time when women were often relegated to the periphery of academic life, Aston established herself as an expert in physical and inorganic chemistry. Her work, characterized by meticulous analytical precision, contributed to the fundamental understanding of atomic weights and the physical properties of liquids—the very building blocks of modern chemical theory.
1. Biography: Early Life and Academic Trajectory
Emily Aston was born in January 1866 in London. She entered the academic world during a transformative period for women’s education in England. She attended University College London (UCL), an institution that was notably more progressive than Oxford or Cambridge regarding the admission of women to degree programs.
Aston excelled in the sciences, earning her Bachelor of Science (BSc) in 1889. Following her graduation, she did not retreat into private life, as was expected of many women of her class; instead, she embarked on a research career that spanned over two decades. She initially worked as a research assistant to Sir William Ramsay, the Nobel Prize-winning chemist who discovered the noble gases. Her career was marked by international mobility—a rarity for female scholars of the era—as she spent significant time conducting research at the University of Geneva alongside Swiss chemists.
2. Major Contributions: Atomic Weights and Physical Chemistry
Aston’s primary intellectual contributions lie in two specialized areas: the determination of atomic weights and the study of molecular surface energy.
-
Refining the Periodic Table:
In the late 1800s, the precise atomic weight of many elements was still a matter of debate. Working with Ramsay, Aston focused on the element Boron. Their research was critical in correcting previous inaccuracies, providing a more stable foundation for the periodic table.
-
Molecular Surface Energy:
Aston investigated the physical behavior of liquids. She explored how the surface tension of liquid mixtures changed relative to temperature and composition. This work was foundational for the field of physical chemistry, helping scientists understand how molecules interact at the surface of a substance—a concept vital to later developments in thermodynamics and fluid dynamics.
-
Mineralogical Analysis:
Aston also applied her analytical skills to geology, performing complex chemical analyses of rocks and minerals (such as those from the Malvern Hills) to determine their elemental composition.
3. Notable Publications
Aston was a prolific writer, often publishing in the Journal of the Chemical Society and the Proceedings of the Royal Society. Her most influential works include:
- "The Atomic Weight of Boron" (1893): Co-authored with William Ramsay, this paper is cited as a landmark in the precise measurement of non-metallic elements.
- "The Molecular Surface-energy of Mixtures of Non-associating Liquids" (1894): This work explored the Ramsay-Shields equation and its application to complex mixtures.
- "The Molecular Surface-energy of some Mixtures of Liquids" (1901): Published during her time in Geneva, this paper extended her research into the behavior of chemical solutions.
- "Contributions to the Chemistry of the Organic Colouring Matters" (1887): Early career work conducted with J.J. Hummel, focusing on the chemical properties of dyes.
4. Awards and Recognition
While women in Aston’s era were rarely granted the same accolades as their male counterparts, her recognition came through her inclusion in the highest echelons of professional discourse:
-
The 1904 Petition:
Emily Aston was one of the 19 signitaries of the 1904 petition to the Chemical Society. This group of women demanded that they be admitted as Fellows of the Society on the same terms as men. Though initially rejected, this petition is now viewed as a pivotal moment in the history of women in science.
-
Fellow of the Chemical Society (1920):
After years of exclusion, the Society finally opened its doors to women in 1920. Aston was among the first wave of women to be officially recognized as a Fellow, acknowledging her decades of contribution.
5. Impact and Legacy
Emily Aston’s legacy is twofold: scientific and institutional.
Scientifically, her work on atomic weights helped move chemistry from a descriptive science to a quantitative one. Her measurements were used by contemporary scientists to calibrate their own experiments, ensuring that the chemical industry and academic researchers were working with standardized data.
Institutionally, Aston was a "quiet radical." By maintaining a high-output research career and collaborating with international Nobel-tier scientists, she proved that women were capable of the rigorous, high-precision work required in physical chemistry. She paved the way for the next generation of female chemists, such as Ida Smedley Maclean and Martha Whiteley.
6. Collaborations
Aston was a highly collaborative researcher, working with some of the most prominent scientific minds of her day:
- Sir William Ramsay: Her most significant mentor and collaborator at UCL.
- Philippe-Auguste Guye: A leading Swiss physical chemist with whom she worked in Geneva on the properties of liquids and molecular weights.
- John James Hummel: A specialist in the chemistry of dyeing, with whom she collaborated during her early research years at the Yorkshire College (now the University of Leeds).
7. Lesser-Known Facts
-
International Mobility:
At a time when most female researchers remained in a single laboratory, Aston’s move to Geneva suggests she was highly sought after for her specific analytical skills. She published several papers in French, demonstrating her fluency and integration into the European scientific community.
-
The "Invisible" Assistant:
In many of Ramsay's early notebooks, Aston's meticulous handwriting and data entries are present, suggesting she performed much of the "heavy lifting" in the experimental phases of his famous gas researches, though she was not always credited on every resulting paper.
-
Independent Wealth:
Like many early women scientists, Aston was able to pursue her research partly because she possessed some private means, allowing her to work in honorary or poorly funded positions that lacked a formal salary—a common barrier for women of the time.
References & Further Reading:
- Rayner-Canham, M., & Rayner-Canham, G. (2008). Chemistry Was Their Life: Pioneer British Women Chemists, 1880-1949.
- Journal of the Chemical Society, Transactions (Vols. 63, 65, 79).
- The Royal Society of Chemistry: "The 1904 Petitioners."