skip to main content

Attention:

The NSF Public Access Repository (NSF-PAR) system and access will be unavailable from 11:00 PM ET on Thursday, October 10 until 2:00 AM ET on Friday, October 11 due to maintenance. We apologize for the inconvenience.

Explore Research Products in the NSF-PAR

Title: Additive manufacturing of complex micro-architected graphene aerogels

High-resolution 3D printing of intricate graphene aerogel micro-architectures with enhanced mechanical properties at decreasing densities.

  more » « less
NSF-PAR ID:
10067930
Author(s) / Creator(s):
 ;  ;  ;  ;  ;  ;  ;  ;  
Publisher / Repository:
Royal Society of Chemistry (RSC)
Date Published:
Journal Name:
Materials Horizons
ISSN:
2051-6347
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
More Like this
  1. ; ( , Synlett)
    Abstract

    This Account summarizes efforts in our group toward synthesis of heterocycles in the past decade. Selected examples of transannulative heterocyclizations, intermediate construction of reactive compounds en route to these important motifs, and newer developments of a radical approach are outlined.

    1 Introduction

    2 Transannulative Heterocyclization

    2.1 Rhodium-Catalyzed Transannulative Heterocyclization

    2.2 Copper-Catalyzed Transannulative Heterocyclization

    3 Synthesis of Heterocycles from Reactive Precursors

    3.1 Synthesis of Heterocycles from Diazo Compounds

    3.2 Synthesis of Heterocycles from Alkynones

    4 Radical Heterocyclization

    4.1 Light-Induced Radical Heterocyclization

    4.2 Light-Free Radical Heterocyclization

    7 Conclusion

     
    more » « less
  2. ; ( , Synlett)
    Abstract

    Dual light-excited ketone/transition-metal catalysis is a rapidly developing field of photochemistry. It allows for versatile functionalizations of C–H or C–X bonds enabled by triplet ketone acting as a hydrogen-atom-abstracting agent, a single-electron acceptor, or a photosensitizer. This review summarizes recent developments of synthetically useful transformations promoted by the synergy between triplet ketone and transition-metal catalysis.

    1 Introduction

    2 Triplet Ketone Catalysis via Hydrogen Atom Transfer

    2.1 Triplet Ketones with Nickel Catalysis

    2.2 Triplet Ketones with Copper Catalysis

    2.3 Triplet Ketones with Other Transition-Metal Catalysis

    3 Triplet Ketone Catalysis via Single-Electron Transfer

    4 Triplet Ketone Catalysis via Energy Transfer

    5 Conclusions

     
    more » « less
  3. ; ; ; ( , Current Protocols in Immunology)
    Abstract

    In this invited article, we explain technical aspects of the lymphocytic choriomeningitis virus (LCMV) system, providing an update of a prior contribution by Matthias von Herrath and J. Lindsay Whitton. We provide an explanation of the LCMV infection models, highlighting the importance of selecting an appropriate route and viral strain. We also describe how to quantify virus‐specific immune responses, followed by an explanation of useful transgenic systems. Specifically, our article will focus on the following protocols. © 2020 Wiley Periodicals LLC.

    Basic Protocol 1: LCMV infection routes in mice

    Support Protocol 1: Preparation of LCMV stocks

    ASSAYS TO MEASURE LCMV TITERS

    Support Protocol 2: Plaque assay

    Support Protocol 3: Immunofluorescence focus assay (IFA) to measure LCMV titer

    MEASUREMENT OF T CELL AND B CELL RESPONSES TO LCMV INFECTION

    Basic Protocol 2: Triple tetramer staining for detection of LCMV‐specific CD8 T cells

    Basic Protocol 3: Intracellular cytokine staining (ICS) for detection of LCMV‐specific T cells

    Basic Protocol 4: Enumeration of direct ex vivo LCMV‐specific antibody‐secreting cells (ASC)

    Basic Protocol 5: Limiting dilution assay (LDA) for detection of LCMV‐specific memory B cells

    Basic Protocol 6: ELISA for quantification of LCMV‐specific IgG antibody

    Support Protocol 4: Preparation of splenic lymphocytes

    Support Protocol 5: Making BHK21‐LCMV lysate

    Basic Protocol 7: Challenge models

    TRANSGENIC MODELS

    Basic Protocol 8: Transfer of P14 cells to interrogate the role of IFN‐I on CD8 T cell responses

    Basic Protocol 9: Comparing the expansion of naïve versus memory CD4 T cells following chronic viral challenge

     
    more » « less
  4. ; ( , Plants)

    All the names in Paronychia described from South America are investigated. Five names (P. arbuscula, P. brasiliana subsp. brasiliana var. pubescens, P. coquimbensis, P. hieronymi, and P. mandoniana) are lecto- or neotypified on specimens preserved at GOET, K, LP, and P. The typification of nine names, first proposed by Chaudhri in 1968 as the “holotype” are corrected according to Art. 9.10 of ICN. Three second-step typifications (Art. 9.17 of ICN) are proposed for P. camphorosmoides, P. communis, and P. hartwegiana. The following nomenclatural changes are proposed: P. arequipensis comb. et stat. nov. (basionym: P. microphylla subsp. microphylla var. arequepensis), P. compacta nom. nov. pro P. andina (Philippi non Gray; Art. 53.1 of ICN), P. jujuyensis comb. et stat. nov. (basionym: P. hieronymi subsp. hieronymi var. jujuyensis), P. compacta subsp. boliviana comb. nov. (basionym: P. andina subsp. boliviana), and P. compacta subsp. purpurea comb. nov. (basionym: P. andina subsp. purpurea). A new species (P. glabra sp. nov.) is proposed based on our examination of live plants and herbarium specimens. P. johnstonii subsp. johnstonii var. scabrida is synonymized (syn. nov.) with P. johnstonii. Finally, P. argyrocoma subsp. argyrocoma is excluded from South America since it was based on misidentified specimens (deposited at MO) of P. andina subsp. andina. A total of 30 species (43 taxa including subspecies, varieties, subvarieties, and forms) are recognized, highlighting that for some (Paronychia chilensis, P. communis, P. setigera) we provisionally accept Chaudhri’s infraspecific classification, since the high phenotypic variability of these taxa is quite complicated and further investigations need to solve their taxonomy.

     
    more » « less
  5. ; ; ; ; ( , Dalton Transactions)
    Reaction of ( p -tol 3 P) 2 PtCl 2 and Me 3 Sn(CC) 2 SiMe 3 (1 : 1/THF/reflux) gives monosubstituted trans -Cl( p -tol 3 P) 2 Pt(CC) 2 SiMe 3 (63%), which with wet n -Bu 4 N + F − yields trans -Cl( p -tol 3 P) 2 Pt(CC) 2 H ( 2 , 96%). Hay oxidative homocoupling (O 2 /CuCl/TMEDA) gives all- trans -Cl( p -tol 3 P) 2 Pt(CC) 4 Pt(P p -tol 3 ) 2 Cl ( 3 , 68%). Reaction of 3 and Me 3 Sn(CC) 2 SiMe 3 (1 : 1/rt) affords monosubstituted all- trans -Cl( p -tol 3 P) 2 Pt(CC) 4 Pt(P p -tol 3 ) 2 (CC) 2 SiMe 3 (46%), which is converted by a similar desilylation/homocoupling sequence to all- trans -Cl[( p -tol 3 P) 2 Pt(CC) 4 ] 3 Pt(P p -tol 3 ) 2 Cl ( 7 ; 79%). Reaction of ( p -tol 3 P) 2 PtCl 2 and excess H(CC) 2 SiMe 3 (HNEt 2 /cat. CuI) gives trans -Me 3 Si(CC) 2 Pt(P p -tol 3 ) 2 (CC) 2 SiMe 3 (78%), which with wet n -Bu 4 N + F − affords trans -H(CC) 2 Pt(P p -tol 3 ) 2 (CC) 2 H (96%). Hay oxidative cross coupling with 2 (1 : 4) gives all- trans -Cl[( p -tol 3 P) 2 Pt(CC) 4 ] 2 Pt(P p -tol 3 ) 2 Cl ( 10 , 36%) along with homocoupling product 3 (33%). Reaction of 3 and Me 3 Sn(CC) 2 SiMe 3 (1 : 2/rt) yields all- trans -Me 3 Si(CC) 2 ( p -tol 3 P) 2 Pt(CC) 4 Pt(P p -tol 3 ) 2 (CC) 2 SiMe 3 ( 17 , 77%), which with wet n -Bu 4 N + F − gives all- trans -H(CC) 2 ( p -tol 3 P) 2 Pt(CC) 4 Pt(P p -tol 3 ) 2 (CC) 2 H (96%). Reaction of 3 and excess Me 3 P gives all- trans -Cl(Me 3 P) 2 Pt(CC) 4 Pt(PMe 3 ) 2 Cl ( 4 , 86%). A model reaction of trans -( p -tol)( p -tol 3 P) 2 PtCl and KSAc yields trans -( p -tol)( p -tol 3 P) 2 PtSAc ( 12 , 75%). Similar reactions of 3 , 7 , 10 , and 4 give all- trans -AcS[(R 3 P) 2 Pt(CC) 4 ] n Pt(PR 3 ) 2 SAc (76–91%). The crystal structures of 3 , 17 , and 12 are determined. The first exhibits a chlorine–chlorine distance of 17.42 Å; those in 10 and 7 are estimated as 30.3 Å and 43.1 Å. 
    more » « less
  • Citation Formats
  • MLA
  • APA
  • Chicago
  • BibTeX
  • Save / Share this Record
  • Send to Email