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Hojo Lab
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The lab designs how molecules are arranged in order to create new materials.
AboutAbout the lab
The science of molecular arrangement
The Hojo Lab conducts research under the banner of "molecular assembly engineering," which deals with states in which large numbers of molecules are gathered together.
Even the same molecule can show very different properties depending on how the molecules are arranged relative to one another. Water and ice are one example.
The lab investigates the relationship between molecular arrangement and material properties, considers the arrangements in which molecular functions are fully exploited, and aims to connect this to the development of new materials.
To arrange molecules as intended, the lab uses the ideas and strategies of supramolecular chemistry.
Key terms
- supramolecular chemistry
- Chemistry that gathers molecules together using weak forces such as hydrogen bonds, creating structures and properties that do not exist when a molecule is on its own
- coordination bond
- A bond formed between a metal ion and atoms such as oxygen or nitrogen. It links molecules in a fixed direction
- terahertz spectroscopy
- A measurement method that shines light with a frequency between infrared and radio waves on a sample to study things such as the slow vibrations between molecules
- cold crystallization
- A phenomenon in which a material does not crystallize when it is cooled, but crystallizes later, for example when it is warmed
ResearchResearch themes
The atoms and molecules that chemistry deals with gather in large numbers in real materials and influence one another. Using the approach of supramolecular chemistry, the lab designs how molecules are arranged, and investigates the relationship between arrangement, such as in molecular crystals, and properties through both experiments and theoretical calculations. It also works on developing heat storage materials that store heat.
*Illustrative imageMolecular crystals built with hydrogen bonds
Assemblies of molecules held together by hydrogen bonds and similar interactions are flexible, and are expected to find applications in stimuli-responsive materials. The lab has also found that a crystal in which molecules are lined up in a single row through hydrogen bonds and coordination bonds shows "dichroism," changing color depending on the direction of polarized light.
*Illustrative imageCalculating intermolecular vibrations
To understand the intermolecular vibrations observed by terahertz spectroscopy, the lab used high-accuracy molecular orbital calculations to express numerically the forces that give rise to the vibrations of two molecules linked by a hydrogen bond.
*Illustrative imageHeat storage materials using metal complexes
The lab is trying to make heat storage materials, which store heat and release it when needed, using metal complexes. Using thermal analysis and X-ray diffraction, it investigates "cold crystallization," a phenomenon in which a material does not crystallize immediately on cooling but crystallizes later.
MembersFaculty
The members of the Hojo Lab consist of faculty, technical staff, research fellows, corporate researchers, doctoral and master's students, and international research students at the graduate school.As of 2025
- ProfessorHirohiko Hojo
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Hoar frost ice crystals in Tuntorp 2” W.carter / CC BY-SA 4.0 (cropped)
- Molecular crystals built with hydrogen bonds: “Fe(C2O4)(H2O)2-chain-from-xtal-2008-CM-3D-balls” Ben Mills / Public domain (cropped)
- Calculating intermolecular vibrations: “M(salen)-complex-3D-balls” Ben Mills / Public domain (cropped)
- Heat storage materials using metal complexes: “Kristali Natrijum- acetata” MILOS ALEKSANDRIC / CC BY-SA 4.0 (cropped)
- Related lab (Molecular Interface Engineering Lab (Itoh Lab)): “Water droplet on a 5 grains of hydrophobic sand” Aidar.Seralin / CC BY-SA 4.0 (cropped)
- Related lab (Aida Lab): “Superabsorber Hydrogel KSG 2917 pK” Petra Klawikowski / CC BY-SA 3.0 (cropped)
- Related lab (Minami Lab): “Fluorescence rainbow” Maxim Bilovitskiy / CC BY-SA 4.0 (cropped)
- Related lab (Nozaki Lab): “Gas line IMG 20230205” Jonathansammy / CC BY-SA 4.0 (cropped)
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