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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteNo gemstone diamond was made. The 2016 demonstrations used DNA as programmable connectors between nanoparticles, guiding them into crystal lattices. One method switched between face-centred-cubic and body-centred-cubic arrangements; another used a tetrahedral DNA-origami cage to give particles four directional connections and assemble a lattice with diamond-like geometry.
That distinction matters. “Diamond-like” describes how particles are positioned in space, not what they are made of. The particles remained nanoparticles, and the demonstrations were laboratory studies of programmable self-assembly—not evidence of bulk diamond production or a commercial manufacturing process.
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What scientists actually made
In the 2016 work reported by Chemistry World on 5 February, two US teams used designed DNA structures to control how colloidal particles attach to one another. Their goal was to make the interaction between particles behave more like an engineered connector than an uncontrolled attraction.
The first team, led by Chad Mirkin at Northwestern University, attached closed DNA hairpins to gold nanoparticles. Short “effector” strands could open selected hairpins. Depending on whether the effector strands were complementary to the hairpin sequences, the particles were reported to favor either a face-centred-cubic (FCC) or a body-centred-cubic (BCC) arrangement. The gold particles were described as approximately 10–20 nanometres in diameter in that contemporaneous report.
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The second team, led by Oleg Gang at Brookhaven National Laboratory, folded a long DNA molecule into a tetrahedral cage. DNA strands inside the cage captured DNA-coated nanoparticles, while strands placed at the four outward-facing vertices connected one cage-particle unit to neighboring units. That geometry supplied four-way, directional coordination and enabled assembly into a diamond-like lattice.
These method details come from the 2016 media report, which cited Science papers by Kim and colleagues (DOI 10.1126/science.aad2212) and Liu and colleagues (DOI 10.1126/science.aad2080). The report is the basis for the specific numbers and descriptions here; it should not be treated as an independent remeasurement of every experimental detail.
How DNA turns into a programmable particle connector
Base pairing supplies selective attraction
DNA has two useful properties for colloidal assembly. First, complementary bases pair selectively: an A sequence recognizes T, and a C sequence recognizes G. Second, the sequence can be written, copied and modified with chemical techniques. When DNA strands are attached to particle surfaces, complementary strands on different particles can hybridize and pull those particles together.
In this setting, DNA is not being used as genetic material. It acts as a molecular recognition layer. The particle core may be gold or another colloid, while the DNA corona determines which other particles can bind, how strongly they bind and, in more elaborate designs, from which directions binding is possible.
Geometry determines more than sequence alone
If sticky strands are distributed broadly over a particle surface, contacts can occur in many directions. Such particles can still crystallize, but several lattices may have similar free energies. To select a particular architecture, designers can restrict where connections form. A cage, patch, hinge or switchable strand arrangement changes the valence and directionality of the interaction—the number and orientation of preferred neighbors.
This is why the two 2016 approaches are complementary. Mirkin’s design changed which DNA contacts were active. Gang’s design physically constrained the available contact directions.
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The switchable hairpin route
Closed strands as an off state
Mirkin’s team attached DNA hairpins to gold nanoparticles. A hairpin folds back on itself, hiding or sequestering a sequence in a closed configuration. In that state, the strand does not present the same binding pattern as an opened hairpin.
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Effector strands select the interaction state
Short effector strands were introduced to open selected hairpins. The effector sequence therefore acted as an instruction: it changed which portions of the surface DNA were available for interparticle hybridization. This is a molecular version of a switch, not a mechanical switch visible at the particle scale.
FCC and BCC outcomes
The 2016 report said that complementary effector sequences favored a face-centred-cubic arrangement, whereas non-complementary strands favored a body-centred-cubic arrangement. FCC crystals place particles at the corners and face centres of a cubic unit cell; BCC crystals place particles at the corners and one particle in the cell centre. Those are distinct long-range arrangements even when the particle material and approximate size are unchanged.
The important result was tunability: changing the DNA recognition condition was reported to shift the preferred polymorph. The method offers a relatively direct way to test different sequence programs without rebuilding the entire particle architecture.
The tetrahedral DNA-origami route
Folding a cage from a long scaffold
Gang’s group used DNA origami, a technique in which a long scaffold strand is folded into a prescribed shape by many shorter staple strands. The report describes an approximately 8,000-base DNA strand and short staples used to construct a tetrahedral cage.
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Capturing a particle inside
Sticky DNA strands positioned inside the cage captured DNA-coated nanoparticles. This internal capture holds the particle relative to the cage instead of leaving every surface contact free to form in an arbitrary direction.
Four outward vertices create directional valence
Additional sticky strands at the tetrahedron’s four outward vertices connected one cage-particle unit to neighboring units. A tetrahedron has four corners, so the design supplied four preferred connection directions. In a repeating assembly, that four-way coordination can produce the connectivity associated with a diamond lattice.
The phrase “diamond-like” refers to lattice geometry. The assembled object was not carbon diamond, did not acquire diamond hardness, and was not reported as a gemstone or bulk diamond material. It was a superstructure in which nanoscale building blocks occupy positions analogous to the network geometry of diamond.
How the two 2016 designs compare
| Design | How directionality or selectivity is created | Reported structural outcome | Main design trade-off |
|---|---|---|---|
| Mirkin hairpin system | Closed DNA hairpins on approximately 10–20 nm gold nanoparticles are opened by selected short effector strands. | Complementary effector sequences favored FCC; non-complementary sequences favored BCC, according to the 5 February 2016 Chemistry World report. | Binding state can be switched through sequence choice, but the surface interaction is less geometrically constrained than a rigid cage. |
| Gang tetrahedral cage | DNA origami folds an approximately 8,000-base scaffold with staple strands; interior strands capture a particle and four outward vertices supply connection sites. | Four-way coordination enabled a diamond-like particle lattice. | The cage imposes strong geometric control, but constructing the cage adds architectural complexity and fixes the available connection directions. |
The comparison is about the reported design principles, not a head-to-head performance test. The article that described the work did not establish a common yield, throughput or efficiency measurement for the two methods.
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Why a diamond-like lattice is difficult
Many colloidal particles naturally form close-packed structures because those arrangements efficiently fill space. A diamond-type network is more open and directional. Each building block has four preferred neighbors rather than the larger coordination typical of close-packed crystals.
Achieving that topology requires more than making particles attractive. Attractions must be limited or oriented so that a particle does not simply bind to every nearby surface. In the tetrahedral design, the cage supplies that constraint physically. In a switchable system, the DNA state changes the balance among available contacts and can alter which polymorph is most stable.
Open frameworks can be scientifically valuable because pores, optical behavior, transport pathways and mechanical responses depend on lattice geometry. However, the 2016 demonstrations established control of assembly, not a finished application with a measured device performance.
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What controls which crystal structure forms?
Programmable DNA pairing
Sequence complementarity determines which strands can hybridize. It can turn a connection on, block a connection, or make one particle population prefer another. The 2016 hairpin example illustrates how changing the effector relationship was associated with FCC versus BCC outcomes.
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Valence—the number of favored neighbors—and angular placement of those contacts strongly affect lattice selection. Four outward vertices on a tetrahedral cage create a very different interaction geometry from a particle covered with mobile or broadly distributed strands.
Particle size and surface presentation
Particle diameter, DNA grafting density, linker length and flexibility all influence how close two cores can approach and how many strands can engage at once. The reported 10–20 nm size applies to the gold nanoparticles in the Mirkin study as described by Chemistry World; it is not a universal size requirement for DNA-programmed assembly.
Nonspecific forces
DNA sequence is not the sole determinant. A 2025 Soft Matter study examined a different system: a binary mixture of same-sized DNA-coated micrometre-scale particles. The authors reported body-centred-tetragonal crystals, including structures related to cesium chloride and copper gold. Their simulations reproduced the observations when nonspecific steric and van der Waals interactions were included.
That result is a qualification, not a direct replication of the 2016 nanoparticle experiments. It shows why a sequence-only explanation can be incomplete. Steric crowding, core-core dispersion forces, solvent conditions and the balance between specific and nonspecific interactions can change the relative stability of competing polymorphs.
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A structure that is stable at equilibrium may not form if particles become trapped in a disordered or metastable state first. Temperature, salt concentration, concentration, mixing history and the rate at which DNA contacts form can influence which pathway is followed. The 2025 review by William M. Jacobs and W. Benjamin Rogers describes the field’s growing focus on dynamic assembly pathways as well as on the design of DNA-mediated interactions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where this fits in DNA-programmed colloidal assembly
The 2016 demonstrations belong to a broader effort to use DNA base pairing as a programmable interaction between colloidal building blocks. Researchers can assign different sequences to different particle populations, create selective partners, and combine particles with DNA-origami components.
According to the 2025 review, current directions include dynamic assemblies that change over time, multicomponent structures containing more than one particle type, and finite assemblies with a defined number of components rather than an indefinitely repeating crystal. DNA origami provides a way to add shape and positional information that a simple surface coating cannot supply.
This approach is often described as “materials by design.” The phrase expresses an ambition to specify a material’s architecture before assembly. It should not be read as proof that any requested material property can already be manufactured on demand.
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A practical design workflow, in concept
- Choose the target architecture. Decide whether the goal is close-packed FCC, BCC, a body-centred-tetragonal variant, a diamond-like network or a finite cluster. The target determines the required coordination and symmetry.
- Define the interaction grammar. Assign complementary and non-complementary DNA sequences, and decide whether contacts should be always available, switchable or restricted to patches or cage vertices.
- Select the scaffold strategy. A surface hairpin can provide sequence-responsive switching. A DNA-origami cage can impose a fixed shape, internal capture site and outward connection directions.
- Account for physical interactions. Include steric repulsion, van der Waals attraction, solvent and ionic conditions, particle size and DNA flexibility in the design model. Specific base pairing is only one term in the free-energy balance.
- Characterize both local and long-range order. Confirm that particles have the intended neighbors and that the overall sample has the intended crystal symmetry. A locally tetrahedral motif does not by itself prove a macroscopic diamond-like crystal.
- Separate proof of assembly from proof of application. A successful lattice demonstration establishes a structure. It does not establish production yield, scale, durability, device performance or commercial readiness.
What the demonstrations do—and do not—prove
- They show that DNA can provide programmable, sequence-specific connections between colloidal particles.
- They report a switch between FCC and BCC arrangements in a hairpin-based gold nanoparticle system.
- They report a tetrahedral DNA-origami cage that gives a captured particle four directional connections and supports a diamond-like lattice.
- They do not show that the particles became carbon diamond or that the method produces gemstone material.
- They do not establish industrial production, consumer availability, manufacturing yield or throughput for these specific demonstrations.
- They do not prove that DNA sequence alone determines every crystal outcome; later work demonstrates the influence of nonspecific interactions in another system.
How the scientists described the significance
Chad Mirkin was quoted in the 2016 Chemistry World report as saying: “Nobody out there can, ahead of time when you make a new material, program crystal symmetry, lattice parameter and crystal habit – we can do that with this system.” The statement captures the attraction of the hairpin strategy: use molecular instructions to target features of a crystal rather than accepting whichever structure forms spontaneously.
Oleg Gang said: “In some sense the creation of diamond tests our ability to fabricate complex materials by self-assembly.” In context, “diamond” means the lattice architecture made from nanoparticle building blocks.
Jan Vermant, a soft materials chemist at ETH Zurich who was not involved, told the publication: “The control over structure is impressive,” while cautioning that the important question is how such structures translate into materials with unique properties. That remains the right distinction: structural control is an enabling capability, not a demonstrated product benefit by itself.
Bottom line for readers
DNA-coated nanoparticles can be programmed to recognize one another and, with suitable geometry, assemble into selected crystal lattices. The 2016 work offered two routes: switchable hairpins that favored FCC or BCC arrangements, and a tetrahedral DNA-origami cage that supplied four-way connections for a diamond-like network. The achievement was nanoscale crystal engineering, not the creation of diamond. Subsequent work and reviews show that successful design must combine DNA sequence and geometry with the less specific physical forces and assembly pathways that also shape crystallization.
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