Negative Pressure Effects during Pure Triacylglyerol Crystallization
Bibliographic record
Abstract
Under certain crystallization conditions, β-tending triacylglyerol (TAG) can form cavities within the crystal network, leading to situations where the macroscopic solid density is less than the melted liquid phase. A similar phenomenon, termed negative pressure effect, has been observed during the crystallization of some synthetic polymers. Crystallization of pure β-tending trilaurin just below its melting point with seeding created a crystal structure with millimeter-sized star-like crystals and large air-filled pores, resulting in a macroscopic density (887.5 ± 2.9 kg m –3 ) that was significantly less than the liquid TAG (897.9 ± 0.6 kg m –3 ) just above its melting point ( T m ). A moderate degree of supercooling (11.5 °C below T m ) led to a platy crystal habit and a higher macroscopic density (1030 ± 2.1 kg m –3 ). However, higher degrees of supercooling (>25 °C below T m ) created a very fine microporous crystal network with a lower density of 993.2 ± 2.5 kg m –3 . It is evident from this work that negative pressure effects can have a significant influence on the macroscopic density of β-tending TAG.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".