Joanna Aizenberg

Harvard University

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Co-Authors

Michael Aizenberg

Harvard University

C. M. Friend

Harvard University

Philseok Kim

Harvard University

Tanya Shirman

Harvard University

M. Luneau

Chalmers University of Technology

Anatoly I. Frenkel

Stony Brook University

Anna V. Shneidman

Harvard University

Jessi E. S. van der Hoeven

Utrecht University

Mathias Kolle

Massachusetts Institute of Technology

Benjamin D. Hatton

University of Toronto

Cooperative Institutions

Harvard University

352

Harvard University Press

137

Massachusetts Institute of Technology

Stanford University

Princeton University

Lawrence Berkeley National Laboratory

University of California, Berkeley

University of California, Los Angeles

University of Wisconsin–Madison

University of Waterloo

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Unraveling 1-Hexene Hydrogenation over Dilute Pd-in-Au Alloys

The Journal of Physical Chemistry C (2022)

Jessi E. S. van der Hoeven Hio Tong Ngan George Yan Joanna Aizenberg R. J. Madix

Dilute Pd-in-Au alloys are valuable materials for selectively hydrogenating alkynes and isomerizing alkenes. By diluting Pd in a Au host, the selectivity toward semihydrogenated alkene isomers can be significantly enhanced and the unfavorable overhydrogenation to alkanes is suppressed. However, a detailed mechanistic study on the origin of the enhanced alkene selectivity over dilute alloy catalysts is still missing. Here, we combine experiment and theory to unravel the reaction mechanism, identifying rate-limiting and selectivity-controlling steps in 1-hexene hydrogenation over dilute Pd-in-Au catalysts. Using isotope-exchange hydrogenation experiments, we show that 1-hexene and hydrogen over a bimetallic Pd4Au96 in silica catalyst preferentially form 1-hexene isomers, (trans and cis) 2- and 3-hexene and only a small amounts of hexane. The reaction is consistent with a Horiuti–Polanyi mechanism, similar to a monometallic Pd nanoparticle catalyst. Computation of the free-energy profiles for 1-hexene hydrogenation and isomerization over a single Pd atom in a Au surface using first principles calculations indicated that the isomerization of 1-hexene to 2-hexene is energetically favorable due to the relatively large barrier for H2 dissociation preventing hydrogenation to n-hexane. Microkinetic modeling established that H2 dissociation on the single-atom Pd sites and H spillover from these sites onto the Au host are rate-limiting and key in steering the selectivity of dilute Pd-in-Au alloys toward the hexene isomers. The mechanistic insights from this study contribute to the rational design of optimized dilute alloy catalysts for selective alkene isomerization.

Hexene

Alkene

1-Hexene

Bimetallic strip

10.1021/acs.jpcc.2c04982

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Citations (8)

Mechanically robust lattices inspired by deep-sea glass sponges

Nature Materials (2020)

Matheus C. Fernandes Joanna Aizenberg James C. Weaver Katia Bertoldi

Sponge

10.1038/s41563-020-0798-1

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Citations (224)

Effect of Surface Chemistry on Incorporation of Nanoparticles within Calcite Single Crystals

Crystal Growth & Design (2019)

Giulia Magnabosco Iryna Polishchuk Francesco Palomba Enrico Rampazzo Luca Prodi

Inclusion of additives into calcite crystals allows one to embed non-native proprieties into the inorganic matrix and obtain new functional materials. Up to now, few parameters have been taken into account to evaluate the efficiency of inclusion of an additive. Taking inspiration from Nature, we grew calcite crystals in the presence of fluorescent silica nanoparticles carrying different functional groups (PluS-X) to investigate the effect of surface chemistry on the inclusion of the additives. PluS-X allowed us to keep constant all the particle characteristics, including size, while changing exposed functional groups and thus Zeta-potential. The effect on crystal morphology, the loading and distribution of PluS-X within the crystals have been evaluated with different microscopy techniques. Our data indicate that hydroxyl functionalized particles are entrapped more efficiently inside calcite single crystals without distortion of the crystal structure and inhibition of the growth.

Zeta potential

Crystal (programming language)

Morphology

10.1021/acs.cgd.9b00208

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Citations (17)

A kinetic model of the transformation of a micropatterned amorphous precursor into a porous single crystal

Acta Biomaterialia (2009)

Peter Fratzl F.D. Fischer Jiří Svoboda Joanna Aizenberg

Crystal (programming language)

10.1016/j.actbio.2009.09.002

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Citations (34)

Hierarchical or Not? Effect of the Length Scale and Hierarchy of the Surface Roughness on Omniphobicity of Lubricant-Infused Substrates

Nano Letters (2013)

Philseok Kim Michael J. Kreder Jack Alvarenga Joanna Aizenberg

Lubricant-infused textured solid substrates are gaining remarkable interest as a new class of omni-repellent nonfouling materials and surface coatings. We investigated the effect of the length scale and hierarchy of the surface topography of the underlying substrates on their ability to retain the lubricant under high shear conditions, which is important for maintaining nonwetting properties under application-relevant conditions. By comparing the lubricant loss, contact angle hysteresis, and sliding angles for water and ethanol droplets on flat, microscale, nanoscale, and hierarchically textured surfaces subjected to various spinning rates (from 100 to 10,000 rpm), we show that lubricant-infused textured surfaces with uniform nanofeatures provide the most shear-tolerant liquid-repellent behavior, unlike lotus leaf-inspired superhydrophobic surfaces, which generally favor hierarchical structures for improved pressure stability and low contact angle hysteresis. On the basis of these findings, we present generalized, low-cost, and scalable methods to manufacture uniform or regionally patterned nanotextured coatings on arbitrary materials and complex shapes. After functionalization and lubrication, these coatings show robust, shear-tolerant omniphobic behavior, transparency, and nonfouling properties against highly contaminating media.

Microscale chemistry

Lotus effect

Hysteresis

Surface Modification

10.1021/nl4003969

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Citations (461)

Theory of the dynamics of evaporation-driven colloidal patterning

Bulletin of the American Physical Society (2014)

C. Nadir Kaplan Ning Wu Shreyas Mandre Joanna Aizenberg L. Mahadevan

Dynamics

Source

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Citations (0)

Controlling ice formation on nanostructured superhydrophobic surfaces

Bulletin of the American Physical Society (2010)

Tom N. Krupenkin Lidiya Mishchenko Benjamin D. Hatton J. Ashley Taylor Vaibhav Bahadur

Source

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Metallic Liquid Gating Membranes

ACS Nano (2020)

Alexander B. Tesler Zhizhi Sheng Wei Lv Yi Fan David Fricke

The development of liquid gating membrane (LGM) systems with tunable multiphase selectivity and antifouling properties is limited by the mechanical stability of the membrane materials. The mechanical integrity of most polymeric membranes can be compromised by deformation under harsh operating conditions (elevated temperatures, corrosive environments, foulants, etc.), ultimately leading to their failure. Here, a facile electrochemical approach to the fabrication of multifunctional metal-based liquid gating membrane systems is presented. The membrane porosity, pore size, and membrane surface roughness can be tuned from micro- to nanometer scale, enabling function under a variety of operating conditions. The prepared LGMs demonstrate controllable gas–liquid selectivity, superior resistance to corrosive conditions and fouling chemicals, and significant reduction of the transmembrane pressure required for the separation process, resulting in lower energy consumption. The stability of the gating liquid is confirmed experimentally through sustained fouling resistance and further supported by the interfacial energy calculations. The mechanically robust metal-based membrane systems reported in this study significantly extend the operating range of LGMs, prompting their applications in water treatment processes such as wastewater treatment, degassing, and multiphase separation.

Biofouling

Membrane Fouling

10.1021/acsnano.9b10063

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Citations (41)

Tunable Liquid Optics: Electrowetting-Controlled Liquid Mirrors Based on Self-Assembled Janus Tiles

Langmuir (2008)

Michael Bucaro Paul Kolodner J. Ashley Taylor Alex Sidorenko Joanna Aizenberg

In this paper, we describe a tunable, high-reflectivity optofluidic device based on self-assembly of anisotropically functionalized hexagonal micromirrors (Janus tiles) on the surface of an oil droplet to create a concave liquid mirror. The liquid mirror is deposited on a patterned transparent electrode that allows the focal length and axial position to be electrically controlled. The mirror is mechanically robust and retains its integrity even at high levels of vibrational excitation of the interface. The use of reflection instead of refraction overcomes the limited available refractive-index contrast between pairs of density-matched liquids, allowing stronger focusing than is possible for a liquid lens of the same geometry. This approach is compatible with optical instruments that could provide novel functionality-for example, a dynamic 3D projector, i.e., a light source which can scan an image onto a moving, nonplanar focal surface. Janus tiles with complex optical properties can be manufactured using our approach, thus potentially enabling a wide range of novel optical elements.

Reflection

Curved mirror

10.1021/la803537v

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Citations (58)

Nanomechanics of Biological Single Crystals

Springer eBooks (2006)

Joanna Aizenberg

Crystal (programming language)

Cleavage (geology)

10.1007/1-4020-3951-4_10

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Citations (11)