Nanoparticle Growth via Concentration Gradients Generated by Enzyme Nanopatterns

de la Rica, Roberto
Bat, Erhan
Herpoldt, Karla L.
Xie, Hai-nan
Bertazzo, Sergio
Maynard, Heather D.
Stevens, Molly M.
Biomineralizing organisms can grow nanomaterials with unexpected morphologies in an organic matrix where temporal and vectorial gradients of crystal growth precursors are established. Here, concentration gradients for the crystallization of gold nanoparticles are generated and applied on silicon substrates. Gradients of crystal growth precursors are generated by enzymes patterned as lines that are separated by distances ranging from the micro- to the nanoscale. The concentration of crystallization precursors around the lines separated by nanometric distances is not only determined by mass transport and enzyme activity but also by the nanoscale organization of biocatalysts. This nanoscale organization favors non-classical crystal growth conditions that lead to the formation of nanoparticle clusters containing nanocrystals that are highly crystallographically aligned. The combination of bottom-up crystal growth with top-down electron beam lithography enables the fabrication of micrometric patterns containing gold nanoparticles of different size, shape, and surface density. These are all critical parameters that determine the physical properties of these nanomaterials.


Unified theory of linear instability of anisotropic surfaces and interfaces under capillary, electrostatic, and elastostatic forces: The regrowth of epitaxial amorphous silicon
Ogurtani, Tarik Omer (American Physical Society (APS), 2006-10-01)
The first-order unified linear instability analysis (LISA) of the governing equation for the evolution of surfaces and interfaces under capillary, electromigration (EM), and elastostatic forces is developed. A formal treatment of the thermomigration (Soret effect) driven by the nonuniform temperature distribution caused by exothermic phase transformation (growth) at the surface and interfacial layers is presented and its apparent influence on the capillary force in connection with the stability is also esta...
Initial crystallization in a nanostructured Al-Sm rare earth alloy
Kalay, Yunus Eren; Chumbley, L. S.; Kramer, M. J.; Anderson, I. E. (Elsevier BV, 2010-06-15)
The transformation kinetics and microstructural evolution during initial crystallization in highly driven Al(90)Sm(10) were investigated using transmission electron microscopy (TEM). conventional Cu K(alpha) and high-energy synchrotron X-ray diffraction (HEXRD) and differential scanning calorimetry (DSC). The highest cooling rate obtained in this study yielded a high number density of fcc-Al nanocrystals, with sizes on the order of 2-5 nm, embedded in a disordered matrix rich in an Al-Sm medium range order ...
BURLAKOV, VM; RYABOV, AP; YAKHEEV, MP; VINOGRADOV, EA; MELNIK, NN; Hasanlı, Nızamı (Wiley, 1989-06-01)
Low‐frequency Raman spectra of a TlInS2 single crystal in the vicinity of a ferroelectric phase transition are reported. In the ferroelectric phase a soft mode interacting with some rigid modes is observed. The temperature dependence of the soft mode frequency is found to be proportional to (Tc – T)1/2. An unusual behaviour of the rigid mode (ω = 20 cm−1) is observed. This fact is interpreted in terms of inherent lattice defects which cause nonhomogeneous broadening.
Karakaya, İshak (The Electrochemical Society, 1986-04-01)
A formation cell was used to study the thermodynamic properties associated with the formation of pure liquid and dissolved in binary melts. The data were used to infer the enthalpy and entropy of mixing. These measurements are shown to be consistent with the known phase diagram.
Synthesis of Optically Complex, Porous, and Anisometric Polymeric Microparticles by Templating from Liquid Crystalline Droplets
Wang, Xiaoguang; Büküşoğlu, Emre; Miller, Daniel S; Pantoja, Marco A. Bedolla; Xiang, Jie; Lavrentovich, Oleg D; Abbott, Nicholas L (Wiley, 2016-10-25)
It is demonstrated that aqueous dispersions of micrometer-sized liquid crystal (LC) droplets provide the basis of a general and facile methodology for the templated synthesis of spherical and nonspherical polymeric micro-particles with complex internal structure and porosity. Specifically, nematic droplets of reactive (RM257)/nonreactive mesogens with distinct internal configurations are prepared using a range of approaches, the reactive mesogens are photopolymerized, and then the nonreactive mesogens are e...
Citation Formats
R. de la Rica et al., “Nanoparticle Growth via Concentration Gradients Generated by Enzyme Nanopatterns,” ADVANCED FUNCTIONAL MATERIALS, pp. 3692–3698, 2014, Accessed: 00, 2020. [Online]. Available: