公开(公告)号：US20240295482A1

公开(公告)日：2024-09-05

申请号：US18588142

申请日：2024-02-27

Applicant: Versitech Limited ,  Southern University of Science and Technology

Inventor： Zhiqin Chu ,  Yumeng Luo ,  Kwai Hei Li

IPC: G01N11/10

CPC classification number: G01N11/10

Abstract: An opto chip for detecting a physical parameter of a liquid sample, comprising an optical structure monolithically integrated with a substrate layer and a functional layer, wherein the substrate layer is light-transmissive and configured to have an upper surface for receiving a droplet of the liquid sample and a lower surface bonded to the functional layer; and the functional layer comprises a light-emitting region and a light-detecting region with the light-emitting region being configured to emit measurement light. The light-detecting region is configured to receive reflected light derived from the measurement light and a signal reflecting the change in intensity thereof is converted into a photocurrent signal. A viscometer and detection method operated using the same opto chip technique. The need for complex external optical calibration is thus eliminated, making the viscometer easier to operate and reducing the overall size of the device.

公开(公告)号：US20230391625A1

公开(公告)日：2023-12-07

申请号：US18033080

申请日：2021-10-21

Applicant: VERSITECH LIMITED

Inventor： Zhiqin Chu ,  Tongtong Zhang

IPC: C01B32/28

CPC classification number: C01B32/28 ,  C01P2004/64 ,  C01P2006/80

Abstract: Disclosed are methods of purifying nanodiamonds and a method of making essentially pure nanodiamonds each involving mixing nanodiamonds with at least one salt to form a mixture; heating the mixture at a temperature from 200° C. to 1,000° C. for a time from 10 minutes to 10 hours; and combining a liquid with the heated mixture and centrifuging at a speed of 30 rcf to 25,000 rcf for a time from 10 seconds to 60 minutes to provide purified nanodiamonds. With the methods of the invention, pure NDs can be produced by one-step processing after air oxidation, without the need for any further centrifugation acts. Furthermore, the developed salt-assisted air oxidation method enables facile scale-up manufacturing of clean NDs, with a rounded shape transformed from original shard-like shape, which is impossible to achieve using any existing purification method.

公开(公告)号：US20240431215A1

公开(公告)日：2024-12-26

申请号：US18686153

申请日：2022-08-19

Applicant: Versitech Limited

Inventor： Jitae Kim ,  Zhaoyi Xu ,  Zhiqin Chu ,  Lingzhi Wang

IPC: H10N50/01 ,  B41J2/04 ,  B82Y30/00 ,  H10B69/00 ,  H10N50/20

Abstract: A method of fabricating a nitrogen-vacancy (NV) center quantum sensing device based on electrohydrodynamic (EHD) printing. A nanopipette with an aperture at one end is filled with nanodiamond suspension ink so the ink is present in a meniscus at The aperture, the nanodiamond suspension ink comprises nanodiamonds and solvent. The nanopipette is supported above a substrate having a back electrode. A DC is applied pulse between the nanopipette and the back electrode so as to generate an electrostatic attractive force resulting in the ejection of nano-diamond-laden droplets with sub-attoliter volume. The droplet lands on the substrate and is allowed to dry due to solvent evaporation. Using the method, the control of the number of printed nano-diamonds is at will, attaining single-particle level precision. This printing approach, therefore, enables printing NV center arrays with a controlled number directly on the substrate without any lithographic process.